3620 lines
119 KiB
C
3620 lines
119 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_FS_H
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#define _LINUX_FS_H
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#include <linux/linkage.h>
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#include <linux/wait_bit.h>
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#include <linux/kdev_t.h>
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#include <linux/dcache.h>
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#include <linux/path.h>
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#include <linux/stat.h>
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#include <linux/cache.h>
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#include <linux/list.h>
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#include <linux/list_lru.h>
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#include <linux/llist.h>
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#include <linux/radix-tree.h>
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#include <linux/xarray.h>
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#include <linux/rbtree.h>
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#include <linux/init.h>
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#include <linux/pid.h>
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#include <linux/bug.h>
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#include <linux/mutex.h>
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#include <linux/rwsem.h>
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#include <linux/mm_types.h>
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#include <linux/capability.h>
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#include <linux/semaphore.h>
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#include <linux/fcntl.h>
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#include <linux/rculist_bl.h>
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#include <linux/atomic.h>
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#include <linux/shrinker.h>
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#include <linux/migrate_mode.h>
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#include <linux/uidgid.h>
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#include <linux/lockdep.h>
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#include <linux/percpu-rwsem.h>
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#include <linux/workqueue.h>
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#include <linux/delayed_call.h>
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#include <linux/uuid.h>
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#include <linux/errseq.h>
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#include <linux/ioprio.h>
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#include <linux/fs_types.h>
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#include <linux/build_bug.h>
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#include <linux/stddef.h>
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#include <linux/mount.h>
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#include <linux/cred.h>
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#include <linux/mnt_idmapping.h>
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#include <linux/slab.h>
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#include <linux/maple_tree.h>
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#include <linux/rw_hint.h>
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#include <asm/byteorder.h>
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#include <uapi/linux/fs.h>
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struct backing_dev_info;
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struct bdi_writeback;
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struct bio;
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struct io_comp_batch;
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struct export_operations;
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struct fiemap_extent_info;
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struct hd_geometry;
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struct iovec;
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struct kiocb;
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struct kobject;
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struct pipe_inode_info;
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struct poll_table_struct;
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struct kstatfs;
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struct vm_area_struct;
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struct vfsmount;
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struct cred;
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struct swap_info_struct;
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struct seq_file;
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struct workqueue_struct;
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struct iov_iter;
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struct fscrypt_inode_info;
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struct fscrypt_operations;
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struct fsverity_info;
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struct fsverity_operations;
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struct fs_context;
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struct fs_parameter_spec;
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struct fileattr;
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struct iomap_ops;
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extern void __init inode_init(void);
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extern void __init inode_init_early(void);
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extern void __init files_init(void);
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extern void __init files_maxfiles_init(void);
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extern unsigned long get_max_files(void);
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extern unsigned int sysctl_nr_open;
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typedef __kernel_rwf_t rwf_t;
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struct buffer_head;
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typedef int (get_block_t)(struct inode *inode, sector_t iblock,
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struct buffer_head *bh_result, int create);
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typedef int (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
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ssize_t bytes, void *private);
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#define MAY_EXEC 0x00000001
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#define MAY_WRITE 0x00000002
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#define MAY_READ 0x00000004
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#define MAY_APPEND 0x00000008
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#define MAY_ACCESS 0x00000010
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#define MAY_OPEN 0x00000020
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#define MAY_CHDIR 0x00000040
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/* called from RCU mode, don't block */
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#define MAY_NOT_BLOCK 0x00000080
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/*
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* flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond
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* to O_WRONLY and O_RDWR via the strange trick in do_dentry_open()
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*/
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/* file is open for reading */
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#define FMODE_READ ((__force fmode_t)0x1)
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/* file is open for writing */
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#define FMODE_WRITE ((__force fmode_t)0x2)
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/* file is seekable */
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#define FMODE_LSEEK ((__force fmode_t)0x4)
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/* file can be accessed using pread */
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#define FMODE_PREAD ((__force fmode_t)0x8)
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/* file can be accessed using pwrite */
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#define FMODE_PWRITE ((__force fmode_t)0x10)
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/* File is opened for execution with sys_execve / sys_uselib */
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#define FMODE_EXEC ((__force fmode_t)0x20)
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/* File writes are restricted (block device specific) */
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#define FMODE_WRITE_RESTRICTED ((__force fmode_t)0x40)
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/* 32bit hashes as llseek() offset (for directories) */
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#define FMODE_32BITHASH ((__force fmode_t)0x200)
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/* 64bit hashes as llseek() offset (for directories) */
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#define FMODE_64BITHASH ((__force fmode_t)0x400)
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/*
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* Don't update ctime and mtime.
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*
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* Currently a special hack for the XFS open_by_handle ioctl, but we'll
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* hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon.
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*/
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#define FMODE_NOCMTIME ((__force fmode_t)0x800)
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/* Expect random access pattern */
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#define FMODE_RANDOM ((__force fmode_t)0x1000)
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/* File is huge (eg. /dev/mem): treat loff_t as unsigned */
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#define FMODE_UNSIGNED_OFFSET ((__force fmode_t)0x2000)
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/* File is opened with O_PATH; almost nothing can be done with it */
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#define FMODE_PATH ((__force fmode_t)0x4000)
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/* File needs atomic accesses to f_pos */
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#define FMODE_ATOMIC_POS ((__force fmode_t)0x8000)
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/* Write access to underlying fs */
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#define FMODE_WRITER ((__force fmode_t)0x10000)
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/* Has read method(s) */
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#define FMODE_CAN_READ ((__force fmode_t)0x20000)
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/* Has write method(s) */
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#define FMODE_CAN_WRITE ((__force fmode_t)0x40000)
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#define FMODE_OPENED ((__force fmode_t)0x80000)
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#define FMODE_CREATED ((__force fmode_t)0x100000)
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/* File is stream-like */
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#define FMODE_STREAM ((__force fmode_t)0x200000)
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/* File supports DIRECT IO */
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#define FMODE_CAN_ODIRECT ((__force fmode_t)0x400000)
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#define FMODE_NOREUSE ((__force fmode_t)0x800000)
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/* File supports non-exclusive O_DIRECT writes from multiple threads */
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#define FMODE_DIO_PARALLEL_WRITE ((__force fmode_t)0x1000000)
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/* File is embedded in backing_file object */
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#define FMODE_BACKING ((__force fmode_t)0x2000000)
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/* File was opened by fanotify and shouldn't generate fanotify events */
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#define FMODE_NONOTIFY ((__force fmode_t)0x4000000)
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/* File is capable of returning -EAGAIN if I/O will block */
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#define FMODE_NOWAIT ((__force fmode_t)0x8000000)
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/* File represents mount that needs unmounting */
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#define FMODE_NEED_UNMOUNT ((__force fmode_t)0x10000000)
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/* File does not contribute to nr_files count */
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#define FMODE_NOACCOUNT ((__force fmode_t)0x20000000)
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/* File supports async buffered reads */
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#define FMODE_BUF_RASYNC ((__force fmode_t)0x40000000)
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/* File supports async nowait buffered writes */
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#define FMODE_BUF_WASYNC ((__force fmode_t)0x80000000)
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/*
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* Attribute flags. These should be or-ed together to figure out what
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* has been changed!
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*/
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#define ATTR_MODE (1 << 0)
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#define ATTR_UID (1 << 1)
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#define ATTR_GID (1 << 2)
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#define ATTR_SIZE (1 << 3)
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#define ATTR_ATIME (1 << 4)
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#define ATTR_MTIME (1 << 5)
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#define ATTR_CTIME (1 << 6)
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#define ATTR_ATIME_SET (1 << 7)
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#define ATTR_MTIME_SET (1 << 8)
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#define ATTR_FORCE (1 << 9) /* Not a change, but a change it */
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#define ATTR_KILL_SUID (1 << 11)
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#define ATTR_KILL_SGID (1 << 12)
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#define ATTR_FILE (1 << 13)
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#define ATTR_KILL_PRIV (1 << 14)
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#define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */
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#define ATTR_TIMES_SET (1 << 16)
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#define ATTR_TOUCH (1 << 17)
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/*
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* Whiteout is represented by a char device. The following constants define the
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* mode and device number to use.
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*/
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#define WHITEOUT_MODE 0
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#define WHITEOUT_DEV 0
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/*
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* This is the Inode Attributes structure, used for notify_change(). It
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* uses the above definitions as flags, to know which values have changed.
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* Also, in this manner, a Filesystem can look at only the values it cares
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* about. Basically, these are the attributes that the VFS layer can
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* request to change from the FS layer.
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*
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* Derek Atkins <warlord@MIT.EDU> 94-10-20
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*/
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struct iattr {
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unsigned int ia_valid;
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umode_t ia_mode;
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/*
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* The two anonymous unions wrap structures with the same member.
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*
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* Filesystems raising FS_ALLOW_IDMAP need to use ia_vfs{g,u}id which
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* are a dedicated type requiring the filesystem to use the dedicated
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* helpers. Other filesystem can continue to use ia_{g,u}id until they
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* have been ported.
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*
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* They always contain the same value. In other words FS_ALLOW_IDMAP
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* pass down the same value on idmapped mounts as they would on regular
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* mounts.
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*/
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union {
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kuid_t ia_uid;
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vfsuid_t ia_vfsuid;
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};
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union {
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kgid_t ia_gid;
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vfsgid_t ia_vfsgid;
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};
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loff_t ia_size;
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struct timespec64 ia_atime;
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struct timespec64 ia_mtime;
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struct timespec64 ia_ctime;
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/*
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* Not an attribute, but an auxiliary info for filesystems wanting to
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* implement an ftruncate() like method. NOTE: filesystem should
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* check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
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*/
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struct file *ia_file;
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};
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/*
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* Includes for diskquotas.
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*/
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#include <linux/quota.h>
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/*
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* Maximum number of layers of fs stack. Needs to be limited to
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* prevent kernel stack overflow
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*/
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#define FILESYSTEM_MAX_STACK_DEPTH 2
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/**
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* enum positive_aop_returns - aop return codes with specific semantics
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*
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* @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
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* completed, that the page is still locked, and
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* should be considered active. The VM uses this hint
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* to return the page to the active list -- it won't
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* be a candidate for writeback again in the near
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* future. Other callers must be careful to unlock
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* the page if they get this return. Returned by
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* writepage();
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*
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* @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
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* unlocked it and the page might have been truncated.
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* The caller should back up to acquiring a new page and
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* trying again. The aop will be taking reasonable
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* precautions not to livelock. If the caller held a page
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* reference, it should drop it before retrying. Returned
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* by read_folio().
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*
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* address_space_operation functions return these large constants to indicate
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* special semantics to the caller. These are much larger than the bytes in a
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* page to allow for functions that return the number of bytes operated on in a
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* given page.
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*/
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enum positive_aop_returns {
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AOP_WRITEPAGE_ACTIVATE = 0x80000,
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AOP_TRUNCATED_PAGE = 0x80001,
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};
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/*
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* oh the beauties of C type declarations.
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*/
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struct page;
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struct address_space;
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struct writeback_control;
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struct readahead_control;
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/* Match RWF_* bits to IOCB bits */
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#define IOCB_HIPRI (__force int) RWF_HIPRI
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#define IOCB_DSYNC (__force int) RWF_DSYNC
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#define IOCB_SYNC (__force int) RWF_SYNC
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#define IOCB_NOWAIT (__force int) RWF_NOWAIT
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#define IOCB_APPEND (__force int) RWF_APPEND
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/* non-RWF related bits - start at 16 */
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#define IOCB_EVENTFD (1 << 16)
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#define IOCB_DIRECT (1 << 17)
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#define IOCB_WRITE (1 << 18)
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/* iocb->ki_waitq is valid */
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#define IOCB_WAITQ (1 << 19)
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#define IOCB_NOIO (1 << 20)
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/* can use bio alloc cache */
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#define IOCB_ALLOC_CACHE (1 << 21)
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/*
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* IOCB_DIO_CALLER_COMP can be set by the iocb owner, to indicate that the
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* iocb completion can be passed back to the owner for execution from a safe
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* context rather than needing to be punted through a workqueue. If this
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* flag is set, the bio completion handling may set iocb->dio_complete to a
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* handler function and iocb->private to context information for that handler.
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* The issuer should call the handler with that context information from task
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* context to complete the processing of the iocb. Note that while this
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* provides a task context for the dio_complete() callback, it should only be
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* used on the completion side for non-IO generating completions. It's fine to
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* call blocking functions from this callback, but they should not wait for
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* unrelated IO (like cache flushing, new IO generation, etc).
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*/
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#define IOCB_DIO_CALLER_COMP (1 << 22)
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/* kiocb is a read or write operation submitted by fs/aio.c. */
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#define IOCB_AIO_RW (1 << 23)
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/* for use in trace events */
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#define TRACE_IOCB_STRINGS \
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{ IOCB_HIPRI, "HIPRI" }, \
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{ IOCB_DSYNC, "DSYNC" }, \
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{ IOCB_SYNC, "SYNC" }, \
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{ IOCB_NOWAIT, "NOWAIT" }, \
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{ IOCB_APPEND, "APPEND" }, \
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{ IOCB_EVENTFD, "EVENTFD"}, \
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{ IOCB_DIRECT, "DIRECT" }, \
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{ IOCB_WRITE, "WRITE" }, \
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{ IOCB_WAITQ, "WAITQ" }, \
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{ IOCB_NOIO, "NOIO" }, \
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{ IOCB_ALLOC_CACHE, "ALLOC_CACHE" }, \
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{ IOCB_DIO_CALLER_COMP, "CALLER_COMP" }
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struct kiocb {
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struct file *ki_filp;
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loff_t ki_pos;
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void (*ki_complete)(struct kiocb *iocb, long ret);
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void *private;
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int ki_flags;
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u16 ki_ioprio; /* See linux/ioprio.h */
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union {
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/*
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* Only used for async buffered reads, where it denotes the
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* page waitqueue associated with completing the read. Valid
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* IFF IOCB_WAITQ is set.
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*/
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struct wait_page_queue *ki_waitq;
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/*
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* Can be used for O_DIRECT IO, where the completion handling
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* is punted back to the issuer of the IO. May only be set
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* if IOCB_DIO_CALLER_COMP is set by the issuer, and the issuer
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* must then check for presence of this handler when ki_complete
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* is invoked. The data passed in to this handler must be
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* assigned to ->private when dio_complete is assigned.
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*/
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ssize_t (*dio_complete)(void *data);
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};
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};
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static inline bool is_sync_kiocb(struct kiocb *kiocb)
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{
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return kiocb->ki_complete == NULL;
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}
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struct address_space_operations {
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int (*writepage)(struct page *page, struct writeback_control *wbc);
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int (*read_folio)(struct file *, struct folio *);
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/* Write back some dirty pages from this mapping. */
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int (*writepages)(struct address_space *, struct writeback_control *);
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/* Mark a folio dirty. Return true if this dirtied it */
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bool (*dirty_folio)(struct address_space *, struct folio *);
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void (*readahead)(struct readahead_control *);
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int (*write_begin)(struct file *, struct address_space *mapping,
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loff_t pos, unsigned len,
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struct page **pagep, void **fsdata);
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int (*write_end)(struct file *, struct address_space *mapping,
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loff_t pos, unsigned len, unsigned copied,
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struct page *page, void *fsdata);
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/* Unfortunately this kludge is needed for FIBMAP. Don't use it */
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sector_t (*bmap)(struct address_space *, sector_t);
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void (*invalidate_folio) (struct folio *, size_t offset, size_t len);
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bool (*release_folio)(struct folio *, gfp_t);
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void (*free_folio)(struct folio *folio);
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ssize_t (*direct_IO)(struct kiocb *, struct iov_iter *iter);
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/*
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* migrate the contents of a folio to the specified target. If
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* migrate_mode is MIGRATE_ASYNC, it must not block.
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*/
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int (*migrate_folio)(struct address_space *, struct folio *dst,
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struct folio *src, enum migrate_mode);
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int (*launder_folio)(struct folio *);
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bool (*is_partially_uptodate) (struct folio *, size_t from,
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size_t count);
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void (*is_dirty_writeback) (struct folio *, bool *dirty, bool *wb);
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int (*error_remove_folio)(struct address_space *, struct folio *);
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/* swapfile support */
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int (*swap_activate)(struct swap_info_struct *sis, struct file *file,
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sector_t *span);
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void (*swap_deactivate)(struct file *file);
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int (*swap_rw)(struct kiocb *iocb, struct iov_iter *iter);
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};
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extern const struct address_space_operations empty_aops;
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/**
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* struct address_space - Contents of a cacheable, mappable object.
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* @host: Owner, either the inode or the block_device.
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* @i_pages: Cached pages.
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* @invalidate_lock: Guards coherency between page cache contents and
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* file offset->disk block mappings in the filesystem during invalidates.
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* It is also used to block modification of page cache contents through
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* memory mappings.
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* @gfp_mask: Memory allocation flags to use for allocating pages.
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* @i_mmap_writable: Number of VM_SHARED, VM_MAYWRITE mappings.
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* @nr_thps: Number of THPs in the pagecache (non-shmem only).
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* @i_mmap: Tree of private and shared mappings.
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* @i_mmap_rwsem: Protects @i_mmap and @i_mmap_writable.
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* @nrpages: Number of page entries, protected by the i_pages lock.
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* @writeback_index: Writeback starts here.
|
|
* @a_ops: Methods.
|
|
* @flags: Error bits and flags (AS_*).
|
|
* @wb_err: The most recent error which has occurred.
|
|
* @i_private_lock: For use by the owner of the address_space.
|
|
* @i_private_list: For use by the owner of the address_space.
|
|
* @i_private_data: For use by the owner of the address_space.
|
|
*/
|
|
struct address_space {
|
|
struct inode *host;
|
|
struct xarray i_pages;
|
|
struct rw_semaphore invalidate_lock;
|
|
gfp_t gfp_mask;
|
|
atomic_t i_mmap_writable;
|
|
#ifdef CONFIG_READ_ONLY_THP_FOR_FS
|
|
/* number of thp, only for non-shmem files */
|
|
atomic_t nr_thps;
|
|
#endif
|
|
struct rb_root_cached i_mmap;
|
|
unsigned long nrpages;
|
|
pgoff_t writeback_index;
|
|
const struct address_space_operations *a_ops;
|
|
unsigned long flags;
|
|
errseq_t wb_err;
|
|
spinlock_t i_private_lock;
|
|
struct list_head i_private_list;
|
|
struct rw_semaphore i_mmap_rwsem;
|
|
void * i_private_data;
|
|
} __attribute__((aligned(sizeof(long)))) __randomize_layout;
|
|
/*
|
|
* On most architectures that alignment is already the case; but
|
|
* must be enforced here for CRIS, to let the least significant bit
|
|
* of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
|
|
*/
|
|
|
|
/* XArray tags, for tagging dirty and writeback pages in the pagecache. */
|
|
#define PAGECACHE_TAG_DIRTY XA_MARK_0
|
|
#define PAGECACHE_TAG_WRITEBACK XA_MARK_1
|
|
#define PAGECACHE_TAG_TOWRITE XA_MARK_2
|
|
|
|
/*
|
|
* Returns true if any of the pages in the mapping are marked with the tag.
|
|
*/
|
|
static inline bool mapping_tagged(struct address_space *mapping, xa_mark_t tag)
|
|
{
|
|
return xa_marked(&mapping->i_pages, tag);
|
|
}
|
|
|
|
static inline void i_mmap_lock_write(struct address_space *mapping)
|
|
{
|
|
down_write(&mapping->i_mmap_rwsem);
|
|
}
|
|
|
|
static inline int i_mmap_trylock_write(struct address_space *mapping)
|
|
{
|
|
return down_write_trylock(&mapping->i_mmap_rwsem);
|
|
}
|
|
|
|
static inline void i_mmap_unlock_write(struct address_space *mapping)
|
|
{
|
|
up_write(&mapping->i_mmap_rwsem);
|
|
}
|
|
|
|
static inline int i_mmap_trylock_read(struct address_space *mapping)
|
|
{
|
|
return down_read_trylock(&mapping->i_mmap_rwsem);
|
|
}
|
|
|
|
static inline void i_mmap_lock_read(struct address_space *mapping)
|
|
{
|
|
down_read(&mapping->i_mmap_rwsem);
|
|
}
|
|
|
|
static inline void i_mmap_unlock_read(struct address_space *mapping)
|
|
{
|
|
up_read(&mapping->i_mmap_rwsem);
|
|
}
|
|
|
|
static inline void i_mmap_assert_locked(struct address_space *mapping)
|
|
{
|
|
lockdep_assert_held(&mapping->i_mmap_rwsem);
|
|
}
|
|
|
|
static inline void i_mmap_assert_write_locked(struct address_space *mapping)
|
|
{
|
|
lockdep_assert_held_write(&mapping->i_mmap_rwsem);
|
|
}
|
|
|
|
/*
|
|
* Might pages of this file be mapped into userspace?
|
|
*/
|
|
static inline int mapping_mapped(struct address_space *mapping)
|
|
{
|
|
return !RB_EMPTY_ROOT(&mapping->i_mmap.rb_root);
|
|
}
|
|
|
|
/*
|
|
* Might pages of this file have been modified in userspace?
|
|
* Note that i_mmap_writable counts all VM_SHARED, VM_MAYWRITE vmas: do_mmap
|
|
* marks vma as VM_SHARED if it is shared, and the file was opened for
|
|
* writing i.e. vma may be mprotected writable even if now readonly.
|
|
*
|
|
* If i_mmap_writable is negative, no new writable mappings are allowed. You
|
|
* can only deny writable mappings, if none exists right now.
|
|
*/
|
|
static inline int mapping_writably_mapped(struct address_space *mapping)
|
|
{
|
|
return atomic_read(&mapping->i_mmap_writable) > 0;
|
|
}
|
|
|
|
static inline int mapping_map_writable(struct address_space *mapping)
|
|
{
|
|
return atomic_inc_unless_negative(&mapping->i_mmap_writable) ?
|
|
0 : -EPERM;
|
|
}
|
|
|
|
static inline void mapping_unmap_writable(struct address_space *mapping)
|
|
{
|
|
atomic_dec(&mapping->i_mmap_writable);
|
|
}
|
|
|
|
static inline int mapping_deny_writable(struct address_space *mapping)
|
|
{
|
|
return atomic_dec_unless_positive(&mapping->i_mmap_writable) ?
|
|
0 : -EBUSY;
|
|
}
|
|
|
|
static inline void mapping_allow_writable(struct address_space *mapping)
|
|
{
|
|
atomic_inc(&mapping->i_mmap_writable);
|
|
}
|
|
|
|
/*
|
|
* Use sequence counter to get consistent i_size on 32-bit processors.
|
|
*/
|
|
#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
|
|
#include <linux/seqlock.h>
|
|
#define __NEED_I_SIZE_ORDERED
|
|
#define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
|
|
#else
|
|
#define i_size_ordered_init(inode) do { } while (0)
|
|
#endif
|
|
|
|
struct posix_acl;
|
|
#define ACL_NOT_CACHED ((void *)(-1))
|
|
/*
|
|
* ACL_DONT_CACHE is for stacked filesystems, that rely on underlying fs to
|
|
* cache the ACL. This also means that ->get_inode_acl() can be called in RCU
|
|
* mode with the LOOKUP_RCU flag.
|
|
*/
|
|
#define ACL_DONT_CACHE ((void *)(-3))
|
|
|
|
static inline struct posix_acl *
|
|
uncached_acl_sentinel(struct task_struct *task)
|
|
{
|
|
return (void *)task + 1;
|
|
}
|
|
|
|
static inline bool
|
|
is_uncached_acl(struct posix_acl *acl)
|
|
{
|
|
return (long)acl & 1;
|
|
}
|
|
|
|
#define IOP_FASTPERM 0x0001
|
|
#define IOP_LOOKUP 0x0002
|
|
#define IOP_NOFOLLOW 0x0004
|
|
#define IOP_XATTR 0x0008
|
|
#define IOP_DEFAULT_READLINK 0x0010
|
|
|
|
struct fsnotify_mark_connector;
|
|
|
|
/*
|
|
* Keep mostly read-only and often accessed (especially for
|
|
* the RCU path lookup and 'stat' data) fields at the beginning
|
|
* of the 'struct inode'
|
|
*/
|
|
struct inode {
|
|
umode_t i_mode;
|
|
unsigned short i_opflags;
|
|
kuid_t i_uid;
|
|
kgid_t i_gid;
|
|
unsigned int i_flags;
|
|
|
|
#ifdef CONFIG_FS_POSIX_ACL
|
|
struct posix_acl *i_acl;
|
|
struct posix_acl *i_default_acl;
|
|
#endif
|
|
|
|
const struct inode_operations *i_op;
|
|
struct super_block *i_sb;
|
|
struct address_space *i_mapping;
|
|
|
|
#ifdef CONFIG_SECURITY
|
|
void *i_security;
|
|
#endif
|
|
|
|
/* Stat data, not accessed from path walking */
|
|
unsigned long i_ino;
|
|
/*
|
|
* Filesystems may only read i_nlink directly. They shall use the
|
|
* following functions for modification:
|
|
*
|
|
* (set|clear|inc|drop)_nlink
|
|
* inode_(inc|dec)_link_count
|
|
*/
|
|
union {
|
|
const unsigned int i_nlink;
|
|
unsigned int __i_nlink;
|
|
};
|
|
dev_t i_rdev;
|
|
loff_t i_size;
|
|
struct timespec64 __i_atime;
|
|
struct timespec64 __i_mtime;
|
|
struct timespec64 __i_ctime; /* use inode_*_ctime accessors! */
|
|
spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */
|
|
unsigned short i_bytes;
|
|
u8 i_blkbits;
|
|
enum rw_hint i_write_hint;
|
|
blkcnt_t i_blocks;
|
|
|
|
#ifdef __NEED_I_SIZE_ORDERED
|
|
seqcount_t i_size_seqcount;
|
|
#endif
|
|
|
|
/* Misc */
|
|
unsigned long i_state;
|
|
struct rw_semaphore i_rwsem;
|
|
|
|
unsigned long dirtied_when; /* jiffies of first dirtying */
|
|
unsigned long dirtied_time_when;
|
|
|
|
struct hlist_node i_hash;
|
|
struct list_head i_io_list; /* backing dev IO list */
|
|
#ifdef CONFIG_CGROUP_WRITEBACK
|
|
struct bdi_writeback *i_wb; /* the associated cgroup wb */
|
|
|
|
/* foreign inode detection, see wbc_detach_inode() */
|
|
int i_wb_frn_winner;
|
|
u16 i_wb_frn_avg_time;
|
|
u16 i_wb_frn_history;
|
|
#endif
|
|
struct list_head i_lru; /* inode LRU list */
|
|
struct list_head i_sb_list;
|
|
struct list_head i_wb_list; /* backing dev writeback list */
|
|
union {
|
|
struct hlist_head i_dentry;
|
|
struct rcu_head i_rcu;
|
|
};
|
|
atomic64_t i_version;
|
|
atomic64_t i_sequence; /* see futex */
|
|
atomic_t i_count;
|
|
atomic_t i_dio_count;
|
|
atomic_t i_writecount;
|
|
#if defined(CONFIG_IMA) || defined(CONFIG_FILE_LOCKING)
|
|
atomic_t i_readcount; /* struct files open RO */
|
|
#endif
|
|
union {
|
|
const struct file_operations *i_fop; /* former ->i_op->default_file_ops */
|
|
void (*free_inode)(struct inode *);
|
|
};
|
|
struct file_lock_context *i_flctx;
|
|
struct address_space i_data;
|
|
struct list_head i_devices;
|
|
union {
|
|
struct pipe_inode_info *i_pipe;
|
|
struct cdev *i_cdev;
|
|
char *i_link;
|
|
unsigned i_dir_seq;
|
|
};
|
|
|
|
__u32 i_generation;
|
|
|
|
#ifdef CONFIG_FSNOTIFY
|
|
__u32 i_fsnotify_mask; /* all events this inode cares about */
|
|
struct fsnotify_mark_connector __rcu *i_fsnotify_marks;
|
|
#endif
|
|
|
|
#ifdef CONFIG_FS_ENCRYPTION
|
|
struct fscrypt_inode_info *i_crypt_info;
|
|
#endif
|
|
|
|
#ifdef CONFIG_FS_VERITY
|
|
struct fsverity_info *i_verity_info;
|
|
#endif
|
|
|
|
void *i_private; /* fs or device private pointer */
|
|
} __randomize_layout;
|
|
|
|
struct timespec64 timestamp_truncate(struct timespec64 t, struct inode *inode);
|
|
|
|
static inline unsigned int i_blocksize(const struct inode *node)
|
|
{
|
|
return (1 << node->i_blkbits);
|
|
}
|
|
|
|
static inline int inode_unhashed(struct inode *inode)
|
|
{
|
|
return hlist_unhashed(&inode->i_hash);
|
|
}
|
|
|
|
/*
|
|
* __mark_inode_dirty expects inodes to be hashed. Since we don't
|
|
* want special inodes in the fileset inode space, we make them
|
|
* appear hashed, but do not put on any lists. hlist_del()
|
|
* will work fine and require no locking.
|
|
*/
|
|
static inline void inode_fake_hash(struct inode *inode)
|
|
{
|
|
hlist_add_fake(&inode->i_hash);
|
|
}
|
|
|
|
/*
|
|
* inode->i_mutex nesting subclasses for the lock validator:
|
|
*
|
|
* 0: the object of the current VFS operation
|
|
* 1: parent
|
|
* 2: child/target
|
|
* 3: xattr
|
|
* 4: second non-directory
|
|
* 5: second parent (when locking independent directories in rename)
|
|
*
|
|
* I_MUTEX_NONDIR2 is for certain operations (such as rename) which lock two
|
|
* non-directories at once.
|
|
*
|
|
* The locking order between these classes is
|
|
* parent[2] -> child -> grandchild -> normal -> xattr -> second non-directory
|
|
*/
|
|
enum inode_i_mutex_lock_class
|
|
{
|
|
I_MUTEX_NORMAL,
|
|
I_MUTEX_PARENT,
|
|
I_MUTEX_CHILD,
|
|
I_MUTEX_XATTR,
|
|
I_MUTEX_NONDIR2,
|
|
I_MUTEX_PARENT2,
|
|
};
|
|
|
|
static inline void inode_lock(struct inode *inode)
|
|
{
|
|
down_write(&inode->i_rwsem);
|
|
}
|
|
|
|
static inline void inode_unlock(struct inode *inode)
|
|
{
|
|
up_write(&inode->i_rwsem);
|
|
}
|
|
|
|
static inline void inode_lock_shared(struct inode *inode)
|
|
{
|
|
down_read(&inode->i_rwsem);
|
|
}
|
|
|
|
static inline void inode_unlock_shared(struct inode *inode)
|
|
{
|
|
up_read(&inode->i_rwsem);
|
|
}
|
|
|
|
static inline int inode_trylock(struct inode *inode)
|
|
{
|
|
return down_write_trylock(&inode->i_rwsem);
|
|
}
|
|
|
|
static inline int inode_trylock_shared(struct inode *inode)
|
|
{
|
|
return down_read_trylock(&inode->i_rwsem);
|
|
}
|
|
|
|
static inline int inode_is_locked(struct inode *inode)
|
|
{
|
|
return rwsem_is_locked(&inode->i_rwsem);
|
|
}
|
|
|
|
static inline void inode_lock_nested(struct inode *inode, unsigned subclass)
|
|
{
|
|
down_write_nested(&inode->i_rwsem, subclass);
|
|
}
|
|
|
|
static inline void inode_lock_shared_nested(struct inode *inode, unsigned subclass)
|
|
{
|
|
down_read_nested(&inode->i_rwsem, subclass);
|
|
}
|
|
|
|
static inline void filemap_invalidate_lock(struct address_space *mapping)
|
|
{
|
|
down_write(&mapping->invalidate_lock);
|
|
}
|
|
|
|
static inline void filemap_invalidate_unlock(struct address_space *mapping)
|
|
{
|
|
up_write(&mapping->invalidate_lock);
|
|
}
|
|
|
|
static inline void filemap_invalidate_lock_shared(struct address_space *mapping)
|
|
{
|
|
down_read(&mapping->invalidate_lock);
|
|
}
|
|
|
|
static inline int filemap_invalidate_trylock_shared(
|
|
struct address_space *mapping)
|
|
{
|
|
return down_read_trylock(&mapping->invalidate_lock);
|
|
}
|
|
|
|
static inline void filemap_invalidate_unlock_shared(
|
|
struct address_space *mapping)
|
|
{
|
|
up_read(&mapping->invalidate_lock);
|
|
}
|
|
|
|
void lock_two_nondirectories(struct inode *, struct inode*);
|
|
void unlock_two_nondirectories(struct inode *, struct inode*);
|
|
|
|
void filemap_invalidate_lock_two(struct address_space *mapping1,
|
|
struct address_space *mapping2);
|
|
void filemap_invalidate_unlock_two(struct address_space *mapping1,
|
|
struct address_space *mapping2);
|
|
|
|
|
|
/*
|
|
* NOTE: in a 32bit arch with a preemptable kernel and
|
|
* an UP compile the i_size_read/write must be atomic
|
|
* with respect to the local cpu (unlike with preempt disabled),
|
|
* but they don't need to be atomic with respect to other cpus like in
|
|
* true SMP (so they need either to either locally disable irq around
|
|
* the read or for example on x86 they can be still implemented as a
|
|
* cmpxchg8b without the need of the lock prefix). For SMP compiles
|
|
* and 64bit archs it makes no difference if preempt is enabled or not.
|
|
*/
|
|
static inline loff_t i_size_read(const struct inode *inode)
|
|
{
|
|
#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
|
|
loff_t i_size;
|
|
unsigned int seq;
|
|
|
|
do {
|
|
seq = read_seqcount_begin(&inode->i_size_seqcount);
|
|
i_size = inode->i_size;
|
|
} while (read_seqcount_retry(&inode->i_size_seqcount, seq));
|
|
return i_size;
|
|
#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION)
|
|
loff_t i_size;
|
|
|
|
preempt_disable();
|
|
i_size = inode->i_size;
|
|
preempt_enable();
|
|
return i_size;
|
|
#else
|
|
/* Pairs with smp_store_release() in i_size_write() */
|
|
return smp_load_acquire(&inode->i_size);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* NOTE: unlike i_size_read(), i_size_write() does need locking around it
|
|
* (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
|
|
* can be lost, resulting in subsequent i_size_read() calls spinning forever.
|
|
*/
|
|
static inline void i_size_write(struct inode *inode, loff_t i_size)
|
|
{
|
|
#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
|
|
preempt_disable();
|
|
write_seqcount_begin(&inode->i_size_seqcount);
|
|
inode->i_size = i_size;
|
|
write_seqcount_end(&inode->i_size_seqcount);
|
|
preempt_enable();
|
|
#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION)
|
|
preempt_disable();
|
|
inode->i_size = i_size;
|
|
preempt_enable();
|
|
#else
|
|
/*
|
|
* Pairs with smp_load_acquire() in i_size_read() to ensure
|
|
* changes related to inode size (such as page contents) are
|
|
* visible before we see the changed inode size.
|
|
*/
|
|
smp_store_release(&inode->i_size, i_size);
|
|
#endif
|
|
}
|
|
|
|
static inline unsigned iminor(const struct inode *inode)
|
|
{
|
|
return MINOR(inode->i_rdev);
|
|
}
|
|
|
|
static inline unsigned imajor(const struct inode *inode)
|
|
{
|
|
return MAJOR(inode->i_rdev);
|
|
}
|
|
|
|
struct fown_struct {
|
|
rwlock_t lock; /* protects pid, uid, euid fields */
|
|
struct pid *pid; /* pid or -pgrp where SIGIO should be sent */
|
|
enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */
|
|
kuid_t uid, euid; /* uid/euid of process setting the owner */
|
|
int signum; /* posix.1b rt signal to be delivered on IO */
|
|
};
|
|
|
|
/**
|
|
* struct file_ra_state - Track a file's readahead state.
|
|
* @start: Where the most recent readahead started.
|
|
* @size: Number of pages read in the most recent readahead.
|
|
* @async_size: Numer of pages that were/are not needed immediately
|
|
* and so were/are genuinely "ahead". Start next readahead when
|
|
* the first of these pages is accessed.
|
|
* @ra_pages: Maximum size of a readahead request, copied from the bdi.
|
|
* @mmap_miss: How many mmap accesses missed in the page cache.
|
|
* @prev_pos: The last byte in the most recent read request.
|
|
*
|
|
* When this structure is passed to ->readahead(), the "most recent"
|
|
* readahead means the current readahead.
|
|
*/
|
|
struct file_ra_state {
|
|
pgoff_t start;
|
|
unsigned int size;
|
|
unsigned int async_size;
|
|
unsigned int ra_pages;
|
|
unsigned int mmap_miss;
|
|
loff_t prev_pos;
|
|
};
|
|
|
|
/*
|
|
* Check if @index falls in the readahead windows.
|
|
*/
|
|
static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index)
|
|
{
|
|
return (index >= ra->start &&
|
|
index < ra->start + ra->size);
|
|
}
|
|
|
|
/*
|
|
* f_{lock,count,pos_lock} members can be highly contended and share
|
|
* the same cacheline. f_{lock,mode} are very frequently used together
|
|
* and so share the same cacheline as well. The read-mostly
|
|
* f_{path,inode,op} are kept on a separate cacheline.
|
|
*/
|
|
struct file {
|
|
union {
|
|
/* fput() uses task work when closing and freeing file (default). */
|
|
struct callback_head f_task_work;
|
|
/* fput() must use workqueue (most kernel threads). */
|
|
struct llist_node f_llist;
|
|
unsigned int f_iocb_flags;
|
|
};
|
|
|
|
/*
|
|
* Protects f_ep, f_flags.
|
|
* Must not be taken from IRQ context.
|
|
*/
|
|
spinlock_t f_lock;
|
|
fmode_t f_mode;
|
|
atomic_long_t f_count;
|
|
struct mutex f_pos_lock;
|
|
loff_t f_pos;
|
|
unsigned int f_flags;
|
|
struct fown_struct f_owner;
|
|
const struct cred *f_cred;
|
|
struct file_ra_state f_ra;
|
|
struct path f_path;
|
|
struct inode *f_inode; /* cached value */
|
|
const struct file_operations *f_op;
|
|
|
|
u64 f_version;
|
|
#ifdef CONFIG_SECURITY
|
|
void *f_security;
|
|
#endif
|
|
/* needed for tty driver, and maybe others */
|
|
void *private_data;
|
|
|
|
#ifdef CONFIG_EPOLL
|
|
/* Used by fs/eventpoll.c to link all the hooks to this file */
|
|
struct hlist_head *f_ep;
|
|
#endif /* #ifdef CONFIG_EPOLL */
|
|
struct address_space *f_mapping;
|
|
errseq_t f_wb_err;
|
|
errseq_t f_sb_err; /* for syncfs */
|
|
} __randomize_layout
|
|
__attribute__((aligned(4))); /* lest something weird decides that 2 is OK */
|
|
|
|
struct file_handle {
|
|
__u32 handle_bytes;
|
|
int handle_type;
|
|
/* file identifier */
|
|
unsigned char f_handle[];
|
|
};
|
|
|
|
static inline struct file *get_file(struct file *f)
|
|
{
|
|
atomic_long_inc(&f->f_count);
|
|
return f;
|
|
}
|
|
|
|
struct file *get_file_rcu(struct file __rcu **f);
|
|
struct file *get_file_active(struct file **f);
|
|
|
|
#define file_count(x) atomic_long_read(&(x)->f_count)
|
|
|
|
#define MAX_NON_LFS ((1UL<<31) - 1)
|
|
|
|
/* Page cache limit. The filesystems should put that into their s_maxbytes
|
|
limits, otherwise bad things can happen in VM. */
|
|
#if BITS_PER_LONG==32
|
|
#define MAX_LFS_FILESIZE ((loff_t)ULONG_MAX << PAGE_SHIFT)
|
|
#elif BITS_PER_LONG==64
|
|
#define MAX_LFS_FILESIZE ((loff_t)LLONG_MAX)
|
|
#endif
|
|
|
|
/* legacy typedef, should eventually be removed */
|
|
typedef void *fl_owner_t;
|
|
|
|
struct file_lock;
|
|
struct file_lease;
|
|
|
|
/* The following constant reflects the upper bound of the file/locking space */
|
|
#ifndef OFFSET_MAX
|
|
#define OFFSET_MAX type_max(loff_t)
|
|
#define OFFT_OFFSET_MAX type_max(off_t)
|
|
#endif
|
|
|
|
extern void send_sigio(struct fown_struct *fown, int fd, int band);
|
|
|
|
static inline struct inode *file_inode(const struct file *f)
|
|
{
|
|
return f->f_inode;
|
|
}
|
|
|
|
/*
|
|
* file_dentry() is a relic from the days that overlayfs was using files with a
|
|
* "fake" path, meaning, f_path on overlayfs and f_inode on underlying fs.
|
|
* In those days, file_dentry() was needed to get the underlying fs dentry that
|
|
* matches f_inode.
|
|
* Files with "fake" path should not exist nowadays, so use an assertion to make
|
|
* sure that file_dentry() was not papering over filesystem bugs.
|
|
*/
|
|
static inline struct dentry *file_dentry(const struct file *file)
|
|
{
|
|
struct dentry *dentry = file->f_path.dentry;
|
|
|
|
WARN_ON_ONCE(d_inode(dentry) != file_inode(file));
|
|
return dentry;
|
|
}
|
|
|
|
struct fasync_struct {
|
|
rwlock_t fa_lock;
|
|
int magic;
|
|
int fa_fd;
|
|
struct fasync_struct *fa_next; /* singly linked list */
|
|
struct file *fa_file;
|
|
struct rcu_head fa_rcu;
|
|
};
|
|
|
|
#define FASYNC_MAGIC 0x4601
|
|
|
|
/* SMP safe fasync helpers: */
|
|
extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
|
|
extern struct fasync_struct *fasync_insert_entry(int, struct file *, struct fasync_struct **, struct fasync_struct *);
|
|
extern int fasync_remove_entry(struct file *, struct fasync_struct **);
|
|
extern struct fasync_struct *fasync_alloc(void);
|
|
extern void fasync_free(struct fasync_struct *);
|
|
|
|
/* can be called from interrupts */
|
|
extern void kill_fasync(struct fasync_struct **, int, int);
|
|
|
|
extern void __f_setown(struct file *filp, struct pid *, enum pid_type, int force);
|
|
extern int f_setown(struct file *filp, int who, int force);
|
|
extern void f_delown(struct file *filp);
|
|
extern pid_t f_getown(struct file *filp);
|
|
extern int send_sigurg(struct fown_struct *fown);
|
|
|
|
/*
|
|
* sb->s_flags. Note that these mirror the equivalent MS_* flags where
|
|
* represented in both.
|
|
*/
|
|
#define SB_RDONLY BIT(0) /* Mount read-only */
|
|
#define SB_NOSUID BIT(1) /* Ignore suid and sgid bits */
|
|
#define SB_NODEV BIT(2) /* Disallow access to device special files */
|
|
#define SB_NOEXEC BIT(3) /* Disallow program execution */
|
|
#define SB_SYNCHRONOUS BIT(4) /* Writes are synced at once */
|
|
#define SB_MANDLOCK BIT(6) /* Allow mandatory locks on an FS */
|
|
#define SB_DIRSYNC BIT(7) /* Directory modifications are synchronous */
|
|
#define SB_NOATIME BIT(10) /* Do not update access times. */
|
|
#define SB_NODIRATIME BIT(11) /* Do not update directory access times */
|
|
#define SB_SILENT BIT(15)
|
|
#define SB_POSIXACL BIT(16) /* Supports POSIX ACLs */
|
|
#define SB_INLINECRYPT BIT(17) /* Use blk-crypto for encrypted files */
|
|
#define SB_KERNMOUNT BIT(22) /* this is a kern_mount call */
|
|
#define SB_I_VERSION BIT(23) /* Update inode I_version field */
|
|
#define SB_LAZYTIME BIT(25) /* Update the on-disk [acm]times lazily */
|
|
|
|
/* These sb flags are internal to the kernel */
|
|
#define SB_DEAD BIT(21)
|
|
#define SB_DYING BIT(24)
|
|
#define SB_SUBMOUNT BIT(26)
|
|
#define SB_FORCE BIT(27)
|
|
#define SB_NOSEC BIT(28)
|
|
#define SB_BORN BIT(29)
|
|
#define SB_ACTIVE BIT(30)
|
|
#define SB_NOUSER BIT(31)
|
|
|
|
/* These flags relate to encoding and casefolding */
|
|
#define SB_ENC_STRICT_MODE_FL (1 << 0)
|
|
|
|
#define sb_has_strict_encoding(sb) \
|
|
(sb->s_encoding_flags & SB_ENC_STRICT_MODE_FL)
|
|
|
|
/*
|
|
* Umount options
|
|
*/
|
|
|
|
#define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
|
|
#define MNT_DETACH 0x00000002 /* Just detach from the tree */
|
|
#define MNT_EXPIRE 0x00000004 /* Mark for expiry */
|
|
#define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */
|
|
#define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */
|
|
|
|
/* sb->s_iflags */
|
|
#define SB_I_CGROUPWB 0x00000001 /* cgroup-aware writeback enabled */
|
|
#define SB_I_NOEXEC 0x00000002 /* Ignore executables on this fs */
|
|
#define SB_I_NODEV 0x00000004 /* Ignore devices on this fs */
|
|
#define SB_I_STABLE_WRITES 0x00000008 /* don't modify blks until WB is done */
|
|
|
|
/* sb->s_iflags to limit user namespace mounts */
|
|
#define SB_I_USERNS_VISIBLE 0x00000010 /* fstype already mounted */
|
|
#define SB_I_IMA_UNVERIFIABLE_SIGNATURE 0x00000020
|
|
#define SB_I_UNTRUSTED_MOUNTER 0x00000040
|
|
#define SB_I_EVM_UNSUPPORTED 0x00000080
|
|
|
|
#define SB_I_SKIP_SYNC 0x00000100 /* Skip superblock at global sync */
|
|
#define SB_I_PERSB_BDI 0x00000200 /* has a per-sb bdi */
|
|
#define SB_I_TS_EXPIRY_WARNED 0x00000400 /* warned about timestamp range expiry */
|
|
#define SB_I_RETIRED 0x00000800 /* superblock shouldn't be reused */
|
|
#define SB_I_NOUMASK 0x00001000 /* VFS does not apply umask */
|
|
|
|
/* Possible states of 'frozen' field */
|
|
enum {
|
|
SB_UNFROZEN = 0, /* FS is unfrozen */
|
|
SB_FREEZE_WRITE = 1, /* Writes, dir ops, ioctls frozen */
|
|
SB_FREEZE_PAGEFAULT = 2, /* Page faults stopped as well */
|
|
SB_FREEZE_FS = 3, /* For internal FS use (e.g. to stop
|
|
* internal threads if needed) */
|
|
SB_FREEZE_COMPLETE = 4, /* ->freeze_fs finished successfully */
|
|
};
|
|
|
|
#define SB_FREEZE_LEVELS (SB_FREEZE_COMPLETE - 1)
|
|
|
|
struct sb_writers {
|
|
unsigned short frozen; /* Is sb frozen? */
|
|
int freeze_kcount; /* How many kernel freeze requests? */
|
|
int freeze_ucount; /* How many userspace freeze requests? */
|
|
struct percpu_rw_semaphore rw_sem[SB_FREEZE_LEVELS];
|
|
};
|
|
|
|
struct super_block {
|
|
struct list_head s_list; /* Keep this first */
|
|
dev_t s_dev; /* search index; _not_ kdev_t */
|
|
unsigned char s_blocksize_bits;
|
|
unsigned long s_blocksize;
|
|
loff_t s_maxbytes; /* Max file size */
|
|
struct file_system_type *s_type;
|
|
const struct super_operations *s_op;
|
|
const struct dquot_operations *dq_op;
|
|
const struct quotactl_ops *s_qcop;
|
|
const struct export_operations *s_export_op;
|
|
unsigned long s_flags;
|
|
unsigned long s_iflags; /* internal SB_I_* flags */
|
|
unsigned long s_magic;
|
|
struct dentry *s_root;
|
|
struct rw_semaphore s_umount;
|
|
int s_count;
|
|
atomic_t s_active;
|
|
#ifdef CONFIG_SECURITY
|
|
void *s_security;
|
|
#endif
|
|
const struct xattr_handler * const *s_xattr;
|
|
#ifdef CONFIG_FS_ENCRYPTION
|
|
const struct fscrypt_operations *s_cop;
|
|
struct fscrypt_keyring *s_master_keys; /* master crypto keys in use */
|
|
#endif
|
|
#ifdef CONFIG_FS_VERITY
|
|
const struct fsverity_operations *s_vop;
|
|
#endif
|
|
#if IS_ENABLED(CONFIG_UNICODE)
|
|
struct unicode_map *s_encoding;
|
|
__u16 s_encoding_flags;
|
|
#endif
|
|
struct hlist_bl_head s_roots; /* alternate root dentries for NFS */
|
|
struct list_head s_mounts; /* list of mounts; _not_ for fs use */
|
|
struct block_device *s_bdev; /* can go away once we use an accessor for @s_bdev_file */
|
|
struct file *s_bdev_file;
|
|
struct backing_dev_info *s_bdi;
|
|
struct mtd_info *s_mtd;
|
|
struct hlist_node s_instances;
|
|
unsigned int s_quota_types; /* Bitmask of supported quota types */
|
|
struct quota_info s_dquot; /* Diskquota specific options */
|
|
|
|
struct sb_writers s_writers;
|
|
|
|
/*
|
|
* Keep s_fs_info, s_time_gran, s_fsnotify_mask, and
|
|
* s_fsnotify_marks together for cache efficiency. They are frequently
|
|
* accessed and rarely modified.
|
|
*/
|
|
void *s_fs_info; /* Filesystem private info */
|
|
|
|
/* Granularity of c/m/atime in ns (cannot be worse than a second) */
|
|
u32 s_time_gran;
|
|
/* Time limits for c/m/atime in seconds */
|
|
time64_t s_time_min;
|
|
time64_t s_time_max;
|
|
#ifdef CONFIG_FSNOTIFY
|
|
__u32 s_fsnotify_mask;
|
|
struct fsnotify_mark_connector __rcu *s_fsnotify_marks;
|
|
#endif
|
|
|
|
/*
|
|
* q: why are s_id and s_sysfs_name not the same? both are human
|
|
* readable strings that identify the filesystem
|
|
* a: s_id is allowed to change at runtime; it's used in log messages,
|
|
* and we want to when a device starts out as single device (s_id is dev
|
|
* name) but then a device is hot added and we have to switch to
|
|
* identifying it by UUID
|
|
* but s_sysfs_name is a handle for programmatic access, and can't
|
|
* change at runtime
|
|
*/
|
|
char s_id[32]; /* Informational name */
|
|
uuid_t s_uuid; /* UUID */
|
|
u8 s_uuid_len; /* Default 16, possibly smaller for weird filesystems */
|
|
|
|
/* if set, fs shows up under sysfs at /sys/fs/$FSTYP/s_sysfs_name */
|
|
char s_sysfs_name[UUID_STRING_LEN + 1];
|
|
|
|
unsigned int s_max_links;
|
|
|
|
/*
|
|
* The next field is for VFS *only*. No filesystems have any business
|
|
* even looking at it. You had been warned.
|
|
*/
|
|
struct mutex s_vfs_rename_mutex; /* Kludge */
|
|
|
|
/*
|
|
* Filesystem subtype. If non-empty the filesystem type field
|
|
* in /proc/mounts will be "type.subtype"
|
|
*/
|
|
const char *s_subtype;
|
|
|
|
const struct dentry_operations *s_d_op; /* default d_op for dentries */
|
|
|
|
struct shrinker *s_shrink; /* per-sb shrinker handle */
|
|
|
|
/* Number of inodes with nlink == 0 but still referenced */
|
|
atomic_long_t s_remove_count;
|
|
|
|
/*
|
|
* Number of inode/mount/sb objects that are being watched, note that
|
|
* inodes objects are currently double-accounted.
|
|
*/
|
|
atomic_long_t s_fsnotify_connectors;
|
|
|
|
/* Read-only state of the superblock is being changed */
|
|
int s_readonly_remount;
|
|
|
|
/* per-sb errseq_t for reporting writeback errors via syncfs */
|
|
errseq_t s_wb_err;
|
|
|
|
/* AIO completions deferred from interrupt context */
|
|
struct workqueue_struct *s_dio_done_wq;
|
|
struct hlist_head s_pins;
|
|
|
|
/*
|
|
* Owning user namespace and default context in which to
|
|
* interpret filesystem uids, gids, quotas, device nodes,
|
|
* xattrs and security labels.
|
|
*/
|
|
struct user_namespace *s_user_ns;
|
|
|
|
/*
|
|
* The list_lru structure is essentially just a pointer to a table
|
|
* of per-node lru lists, each of which has its own spinlock.
|
|
* There is no need to put them into separate cachelines.
|
|
*/
|
|
struct list_lru s_dentry_lru;
|
|
struct list_lru s_inode_lru;
|
|
struct rcu_head rcu;
|
|
struct work_struct destroy_work;
|
|
|
|
struct mutex s_sync_lock; /* sync serialisation lock */
|
|
|
|
/*
|
|
* Indicates how deep in a filesystem stack this SB is
|
|
*/
|
|
int s_stack_depth;
|
|
|
|
/* s_inode_list_lock protects s_inodes */
|
|
spinlock_t s_inode_list_lock ____cacheline_aligned_in_smp;
|
|
struct list_head s_inodes; /* all inodes */
|
|
|
|
spinlock_t s_inode_wblist_lock;
|
|
struct list_head s_inodes_wb; /* writeback inodes */
|
|
} __randomize_layout;
|
|
|
|
static inline struct user_namespace *i_user_ns(const struct inode *inode)
|
|
{
|
|
return inode->i_sb->s_user_ns;
|
|
}
|
|
|
|
/* Helper functions so that in most cases filesystems will
|
|
* not need to deal directly with kuid_t and kgid_t and can
|
|
* instead deal with the raw numeric values that are stored
|
|
* in the filesystem.
|
|
*/
|
|
static inline uid_t i_uid_read(const struct inode *inode)
|
|
{
|
|
return from_kuid(i_user_ns(inode), inode->i_uid);
|
|
}
|
|
|
|
static inline gid_t i_gid_read(const struct inode *inode)
|
|
{
|
|
return from_kgid(i_user_ns(inode), inode->i_gid);
|
|
}
|
|
|
|
static inline void i_uid_write(struct inode *inode, uid_t uid)
|
|
{
|
|
inode->i_uid = make_kuid(i_user_ns(inode), uid);
|
|
}
|
|
|
|
static inline void i_gid_write(struct inode *inode, gid_t gid)
|
|
{
|
|
inode->i_gid = make_kgid(i_user_ns(inode), gid);
|
|
}
|
|
|
|
/**
|
|
* i_uid_into_vfsuid - map an inode's i_uid down according to an idmapping
|
|
* @idmap: idmap of the mount the inode was found from
|
|
* @inode: inode to map
|
|
*
|
|
* Return: whe inode's i_uid mapped down according to @idmap.
|
|
* If the inode's i_uid has no mapping INVALID_VFSUID is returned.
|
|
*/
|
|
static inline vfsuid_t i_uid_into_vfsuid(struct mnt_idmap *idmap,
|
|
const struct inode *inode)
|
|
{
|
|
return make_vfsuid(idmap, i_user_ns(inode), inode->i_uid);
|
|
}
|
|
|
|
/**
|
|
* i_uid_needs_update - check whether inode's i_uid needs to be updated
|
|
* @idmap: idmap of the mount the inode was found from
|
|
* @attr: the new attributes of @inode
|
|
* @inode: the inode to update
|
|
*
|
|
* Check whether the $inode's i_uid field needs to be updated taking idmapped
|
|
* mounts into account if the filesystem supports it.
|
|
*
|
|
* Return: true if @inode's i_uid field needs to be updated, false if not.
|
|
*/
|
|
static inline bool i_uid_needs_update(struct mnt_idmap *idmap,
|
|
const struct iattr *attr,
|
|
const struct inode *inode)
|
|
{
|
|
return ((attr->ia_valid & ATTR_UID) &&
|
|
!vfsuid_eq(attr->ia_vfsuid,
|
|
i_uid_into_vfsuid(idmap, inode)));
|
|
}
|
|
|
|
/**
|
|
* i_uid_update - update @inode's i_uid field
|
|
* @idmap: idmap of the mount the inode was found from
|
|
* @attr: the new attributes of @inode
|
|
* @inode: the inode to update
|
|
*
|
|
* Safely update @inode's i_uid field translating the vfsuid of any idmapped
|
|
* mount into the filesystem kuid.
|
|
*/
|
|
static inline void i_uid_update(struct mnt_idmap *idmap,
|
|
const struct iattr *attr,
|
|
struct inode *inode)
|
|
{
|
|
if (attr->ia_valid & ATTR_UID)
|
|
inode->i_uid = from_vfsuid(idmap, i_user_ns(inode),
|
|
attr->ia_vfsuid);
|
|
}
|
|
|
|
/**
|
|
* i_gid_into_vfsgid - map an inode's i_gid down according to an idmapping
|
|
* @idmap: idmap of the mount the inode was found from
|
|
* @inode: inode to map
|
|
*
|
|
* Return: the inode's i_gid mapped down according to @idmap.
|
|
* If the inode's i_gid has no mapping INVALID_VFSGID is returned.
|
|
*/
|
|
static inline vfsgid_t i_gid_into_vfsgid(struct mnt_idmap *idmap,
|
|
const struct inode *inode)
|
|
{
|
|
return make_vfsgid(idmap, i_user_ns(inode), inode->i_gid);
|
|
}
|
|
|
|
/**
|
|
* i_gid_needs_update - check whether inode's i_gid needs to be updated
|
|
* @idmap: idmap of the mount the inode was found from
|
|
* @attr: the new attributes of @inode
|
|
* @inode: the inode to update
|
|
*
|
|
* Check whether the $inode's i_gid field needs to be updated taking idmapped
|
|
* mounts into account if the filesystem supports it.
|
|
*
|
|
* Return: true if @inode's i_gid field needs to be updated, false if not.
|
|
*/
|
|
static inline bool i_gid_needs_update(struct mnt_idmap *idmap,
|
|
const struct iattr *attr,
|
|
const struct inode *inode)
|
|
{
|
|
return ((attr->ia_valid & ATTR_GID) &&
|
|
!vfsgid_eq(attr->ia_vfsgid,
|
|
i_gid_into_vfsgid(idmap, inode)));
|
|
}
|
|
|
|
/**
|
|
* i_gid_update - update @inode's i_gid field
|
|
* @idmap: idmap of the mount the inode was found from
|
|
* @attr: the new attributes of @inode
|
|
* @inode: the inode to update
|
|
*
|
|
* Safely update @inode's i_gid field translating the vfsgid of any idmapped
|
|
* mount into the filesystem kgid.
|
|
*/
|
|
static inline void i_gid_update(struct mnt_idmap *idmap,
|
|
const struct iattr *attr,
|
|
struct inode *inode)
|
|
{
|
|
if (attr->ia_valid & ATTR_GID)
|
|
inode->i_gid = from_vfsgid(idmap, i_user_ns(inode),
|
|
attr->ia_vfsgid);
|
|
}
|
|
|
|
/**
|
|
* inode_fsuid_set - initialize inode's i_uid field with callers fsuid
|
|
* @inode: inode to initialize
|
|
* @idmap: idmap of the mount the inode was found from
|
|
*
|
|
* Initialize the i_uid field of @inode. If the inode was found/created via
|
|
* an idmapped mount map the caller's fsuid according to @idmap.
|
|
*/
|
|
static inline void inode_fsuid_set(struct inode *inode,
|
|
struct mnt_idmap *idmap)
|
|
{
|
|
inode->i_uid = mapped_fsuid(idmap, i_user_ns(inode));
|
|
}
|
|
|
|
/**
|
|
* inode_fsgid_set - initialize inode's i_gid field with callers fsgid
|
|
* @inode: inode to initialize
|
|
* @idmap: idmap of the mount the inode was found from
|
|
*
|
|
* Initialize the i_gid field of @inode. If the inode was found/created via
|
|
* an idmapped mount map the caller's fsgid according to @idmap.
|
|
*/
|
|
static inline void inode_fsgid_set(struct inode *inode,
|
|
struct mnt_idmap *idmap)
|
|
{
|
|
inode->i_gid = mapped_fsgid(idmap, i_user_ns(inode));
|
|
}
|
|
|
|
/**
|
|
* fsuidgid_has_mapping() - check whether caller's fsuid/fsgid is mapped
|
|
* @sb: the superblock we want a mapping in
|
|
* @idmap: idmap of the relevant mount
|
|
*
|
|
* Check whether the caller's fsuid and fsgid have a valid mapping in the
|
|
* s_user_ns of the superblock @sb. If the caller is on an idmapped mount map
|
|
* the caller's fsuid and fsgid according to the @idmap first.
|
|
*
|
|
* Return: true if fsuid and fsgid is mapped, false if not.
|
|
*/
|
|
static inline bool fsuidgid_has_mapping(struct super_block *sb,
|
|
struct mnt_idmap *idmap)
|
|
{
|
|
struct user_namespace *fs_userns = sb->s_user_ns;
|
|
kuid_t kuid;
|
|
kgid_t kgid;
|
|
|
|
kuid = mapped_fsuid(idmap, fs_userns);
|
|
if (!uid_valid(kuid))
|
|
return false;
|
|
kgid = mapped_fsgid(idmap, fs_userns);
|
|
if (!gid_valid(kgid))
|
|
return false;
|
|
return kuid_has_mapping(fs_userns, kuid) &&
|
|
kgid_has_mapping(fs_userns, kgid);
|
|
}
|
|
|
|
struct timespec64 current_time(struct inode *inode);
|
|
struct timespec64 inode_set_ctime_current(struct inode *inode);
|
|
|
|
static inline time64_t inode_get_atime_sec(const struct inode *inode)
|
|
{
|
|
return inode->__i_atime.tv_sec;
|
|
}
|
|
|
|
static inline long inode_get_atime_nsec(const struct inode *inode)
|
|
{
|
|
return inode->__i_atime.tv_nsec;
|
|
}
|
|
|
|
static inline struct timespec64 inode_get_atime(const struct inode *inode)
|
|
{
|
|
return inode->__i_atime;
|
|
}
|
|
|
|
static inline struct timespec64 inode_set_atime_to_ts(struct inode *inode,
|
|
struct timespec64 ts)
|
|
{
|
|
inode->__i_atime = ts;
|
|
return ts;
|
|
}
|
|
|
|
static inline struct timespec64 inode_set_atime(struct inode *inode,
|
|
time64_t sec, long nsec)
|
|
{
|
|
struct timespec64 ts = { .tv_sec = sec,
|
|
.tv_nsec = nsec };
|
|
return inode_set_atime_to_ts(inode, ts);
|
|
}
|
|
|
|
static inline time64_t inode_get_mtime_sec(const struct inode *inode)
|
|
{
|
|
return inode->__i_mtime.tv_sec;
|
|
}
|
|
|
|
static inline long inode_get_mtime_nsec(const struct inode *inode)
|
|
{
|
|
return inode->__i_mtime.tv_nsec;
|
|
}
|
|
|
|
static inline struct timespec64 inode_get_mtime(const struct inode *inode)
|
|
{
|
|
return inode->__i_mtime;
|
|
}
|
|
|
|
static inline struct timespec64 inode_set_mtime_to_ts(struct inode *inode,
|
|
struct timespec64 ts)
|
|
{
|
|
inode->__i_mtime = ts;
|
|
return ts;
|
|
}
|
|
|
|
static inline struct timespec64 inode_set_mtime(struct inode *inode,
|
|
time64_t sec, long nsec)
|
|
{
|
|
struct timespec64 ts = { .tv_sec = sec,
|
|
.tv_nsec = nsec };
|
|
return inode_set_mtime_to_ts(inode, ts);
|
|
}
|
|
|
|
static inline time64_t inode_get_ctime_sec(const struct inode *inode)
|
|
{
|
|
return inode->__i_ctime.tv_sec;
|
|
}
|
|
|
|
static inline long inode_get_ctime_nsec(const struct inode *inode)
|
|
{
|
|
return inode->__i_ctime.tv_nsec;
|
|
}
|
|
|
|
static inline struct timespec64 inode_get_ctime(const struct inode *inode)
|
|
{
|
|
return inode->__i_ctime;
|
|
}
|
|
|
|
static inline struct timespec64 inode_set_ctime_to_ts(struct inode *inode,
|
|
struct timespec64 ts)
|
|
{
|
|
inode->__i_ctime = ts;
|
|
return ts;
|
|
}
|
|
|
|
/**
|
|
* inode_set_ctime - set the ctime in the inode
|
|
* @inode: inode in which to set the ctime
|
|
* @sec: tv_sec value to set
|
|
* @nsec: tv_nsec value to set
|
|
*
|
|
* Set the ctime in @inode to { @sec, @nsec }
|
|
*/
|
|
static inline struct timespec64 inode_set_ctime(struct inode *inode,
|
|
time64_t sec, long nsec)
|
|
{
|
|
struct timespec64 ts = { .tv_sec = sec,
|
|
.tv_nsec = nsec };
|
|
|
|
return inode_set_ctime_to_ts(inode, ts);
|
|
}
|
|
|
|
struct timespec64 simple_inode_init_ts(struct inode *inode);
|
|
|
|
/*
|
|
* Snapshotting support.
|
|
*/
|
|
|
|
/*
|
|
* These are internal functions, please use sb_start_{write,pagefault,intwrite}
|
|
* instead.
|
|
*/
|
|
static inline void __sb_end_write(struct super_block *sb, int level)
|
|
{
|
|
percpu_up_read(sb->s_writers.rw_sem + level-1);
|
|
}
|
|
|
|
static inline void __sb_start_write(struct super_block *sb, int level)
|
|
{
|
|
percpu_down_read(sb->s_writers.rw_sem + level - 1);
|
|
}
|
|
|
|
static inline bool __sb_start_write_trylock(struct super_block *sb, int level)
|
|
{
|
|
return percpu_down_read_trylock(sb->s_writers.rw_sem + level - 1);
|
|
}
|
|
|
|
#define __sb_writers_acquired(sb, lev) \
|
|
percpu_rwsem_acquire(&(sb)->s_writers.rw_sem[(lev)-1], 1, _THIS_IP_)
|
|
#define __sb_writers_release(sb, lev) \
|
|
percpu_rwsem_release(&(sb)->s_writers.rw_sem[(lev)-1], 1, _THIS_IP_)
|
|
|
|
/**
|
|
* __sb_write_started - check if sb freeze level is held
|
|
* @sb: the super we write to
|
|
* @level: the freeze level
|
|
*
|
|
* * > 0 - sb freeze level is held
|
|
* * 0 - sb freeze level is not held
|
|
* * < 0 - !CONFIG_LOCKDEP/LOCK_STATE_UNKNOWN
|
|
*/
|
|
static inline int __sb_write_started(const struct super_block *sb, int level)
|
|
{
|
|
return lockdep_is_held_type(sb->s_writers.rw_sem + level - 1, 1);
|
|
}
|
|
|
|
/**
|
|
* sb_write_started - check if SB_FREEZE_WRITE is held
|
|
* @sb: the super we write to
|
|
*
|
|
* May be false positive with !CONFIG_LOCKDEP/LOCK_STATE_UNKNOWN.
|
|
*/
|
|
static inline bool sb_write_started(const struct super_block *sb)
|
|
{
|
|
return __sb_write_started(sb, SB_FREEZE_WRITE);
|
|
}
|
|
|
|
/**
|
|
* sb_write_not_started - check if SB_FREEZE_WRITE is not held
|
|
* @sb: the super we write to
|
|
*
|
|
* May be false positive with !CONFIG_LOCKDEP/LOCK_STATE_UNKNOWN.
|
|
*/
|
|
static inline bool sb_write_not_started(const struct super_block *sb)
|
|
{
|
|
return __sb_write_started(sb, SB_FREEZE_WRITE) <= 0;
|
|
}
|
|
|
|
/**
|
|
* file_write_started - check if SB_FREEZE_WRITE is held
|
|
* @file: the file we write to
|
|
*
|
|
* May be false positive with !CONFIG_LOCKDEP/LOCK_STATE_UNKNOWN.
|
|
* May be false positive with !S_ISREG, because file_start_write() has
|
|
* no effect on !S_ISREG.
|
|
*/
|
|
static inline bool file_write_started(const struct file *file)
|
|
{
|
|
if (!S_ISREG(file_inode(file)->i_mode))
|
|
return true;
|
|
return sb_write_started(file_inode(file)->i_sb);
|
|
}
|
|
|
|
/**
|
|
* file_write_not_started - check if SB_FREEZE_WRITE is not held
|
|
* @file: the file we write to
|
|
*
|
|
* May be false positive with !CONFIG_LOCKDEP/LOCK_STATE_UNKNOWN.
|
|
* May be false positive with !S_ISREG, because file_start_write() has
|
|
* no effect on !S_ISREG.
|
|
*/
|
|
static inline bool file_write_not_started(const struct file *file)
|
|
{
|
|
if (!S_ISREG(file_inode(file)->i_mode))
|
|
return true;
|
|
return sb_write_not_started(file_inode(file)->i_sb);
|
|
}
|
|
|
|
/**
|
|
* sb_end_write - drop write access to a superblock
|
|
* @sb: the super we wrote to
|
|
*
|
|
* Decrement number of writers to the filesystem. Wake up possible waiters
|
|
* wanting to freeze the filesystem.
|
|
*/
|
|
static inline void sb_end_write(struct super_block *sb)
|
|
{
|
|
__sb_end_write(sb, SB_FREEZE_WRITE);
|
|
}
|
|
|
|
/**
|
|
* sb_end_pagefault - drop write access to a superblock from a page fault
|
|
* @sb: the super we wrote to
|
|
*
|
|
* Decrement number of processes handling write page fault to the filesystem.
|
|
* Wake up possible waiters wanting to freeze the filesystem.
|
|
*/
|
|
static inline void sb_end_pagefault(struct super_block *sb)
|
|
{
|
|
__sb_end_write(sb, SB_FREEZE_PAGEFAULT);
|
|
}
|
|
|
|
/**
|
|
* sb_end_intwrite - drop write access to a superblock for internal fs purposes
|
|
* @sb: the super we wrote to
|
|
*
|
|
* Decrement fs-internal number of writers to the filesystem. Wake up possible
|
|
* waiters wanting to freeze the filesystem.
|
|
*/
|
|
static inline void sb_end_intwrite(struct super_block *sb)
|
|
{
|
|
__sb_end_write(sb, SB_FREEZE_FS);
|
|
}
|
|
|
|
/**
|
|
* sb_start_write - get write access to a superblock
|
|
* @sb: the super we write to
|
|
*
|
|
* When a process wants to write data or metadata to a file system (i.e. dirty
|
|
* a page or an inode), it should embed the operation in a sb_start_write() -
|
|
* sb_end_write() pair to get exclusion against file system freezing. This
|
|
* function increments number of writers preventing freezing. If the file
|
|
* system is already frozen, the function waits until the file system is
|
|
* thawed.
|
|
*
|
|
* Since freeze protection behaves as a lock, users have to preserve
|
|
* ordering of freeze protection and other filesystem locks. Generally,
|
|
* freeze protection should be the outermost lock. In particular, we have:
|
|
*
|
|
* sb_start_write
|
|
* -> i_mutex (write path, truncate, directory ops, ...)
|
|
* -> s_umount (freeze_super, thaw_super)
|
|
*/
|
|
static inline void sb_start_write(struct super_block *sb)
|
|
{
|
|
__sb_start_write(sb, SB_FREEZE_WRITE);
|
|
}
|
|
|
|
static inline bool sb_start_write_trylock(struct super_block *sb)
|
|
{
|
|
return __sb_start_write_trylock(sb, SB_FREEZE_WRITE);
|
|
}
|
|
|
|
/**
|
|
* sb_start_pagefault - get write access to a superblock from a page fault
|
|
* @sb: the super we write to
|
|
*
|
|
* When a process starts handling write page fault, it should embed the
|
|
* operation into sb_start_pagefault() - sb_end_pagefault() pair to get
|
|
* exclusion against file system freezing. This is needed since the page fault
|
|
* is going to dirty a page. This function increments number of running page
|
|
* faults preventing freezing. If the file system is already frozen, the
|
|
* function waits until the file system is thawed.
|
|
*
|
|
* Since page fault freeze protection behaves as a lock, users have to preserve
|
|
* ordering of freeze protection and other filesystem locks. It is advised to
|
|
* put sb_start_pagefault() close to mmap_lock in lock ordering. Page fault
|
|
* handling code implies lock dependency:
|
|
*
|
|
* mmap_lock
|
|
* -> sb_start_pagefault
|
|
*/
|
|
static inline void sb_start_pagefault(struct super_block *sb)
|
|
{
|
|
__sb_start_write(sb, SB_FREEZE_PAGEFAULT);
|
|
}
|
|
|
|
/**
|
|
* sb_start_intwrite - get write access to a superblock for internal fs purposes
|
|
* @sb: the super we write to
|
|
*
|
|
* This is the third level of protection against filesystem freezing. It is
|
|
* free for use by a filesystem. The only requirement is that it must rank
|
|
* below sb_start_pagefault.
|
|
*
|
|
* For example filesystem can call sb_start_intwrite() when starting a
|
|
* transaction which somewhat eases handling of freezing for internal sources
|
|
* of filesystem changes (internal fs threads, discarding preallocation on file
|
|
* close, etc.).
|
|
*/
|
|
static inline void sb_start_intwrite(struct super_block *sb)
|
|
{
|
|
__sb_start_write(sb, SB_FREEZE_FS);
|
|
}
|
|
|
|
static inline bool sb_start_intwrite_trylock(struct super_block *sb)
|
|
{
|
|
return __sb_start_write_trylock(sb, SB_FREEZE_FS);
|
|
}
|
|
|
|
bool inode_owner_or_capable(struct mnt_idmap *idmap,
|
|
const struct inode *inode);
|
|
|
|
/*
|
|
* VFS helper functions..
|
|
*/
|
|
int vfs_create(struct mnt_idmap *, struct inode *,
|
|
struct dentry *, umode_t, bool);
|
|
int vfs_mkdir(struct mnt_idmap *, struct inode *,
|
|
struct dentry *, umode_t);
|
|
int vfs_mknod(struct mnt_idmap *, struct inode *, struct dentry *,
|
|
umode_t, dev_t);
|
|
int vfs_symlink(struct mnt_idmap *, struct inode *,
|
|
struct dentry *, const char *);
|
|
int vfs_link(struct dentry *, struct mnt_idmap *, struct inode *,
|
|
struct dentry *, struct inode **);
|
|
int vfs_rmdir(struct mnt_idmap *, struct inode *, struct dentry *);
|
|
int vfs_unlink(struct mnt_idmap *, struct inode *, struct dentry *,
|
|
struct inode **);
|
|
|
|
/**
|
|
* struct renamedata - contains all information required for renaming
|
|
* @old_mnt_idmap: idmap of the old mount the inode was found from
|
|
* @old_dir: parent of source
|
|
* @old_dentry: source
|
|
* @new_mnt_idmap: idmap of the new mount the inode was found from
|
|
* @new_dir: parent of destination
|
|
* @new_dentry: destination
|
|
* @delegated_inode: returns an inode needing a delegation break
|
|
* @flags: rename flags
|
|
*/
|
|
struct renamedata {
|
|
struct mnt_idmap *old_mnt_idmap;
|
|
struct inode *old_dir;
|
|
struct dentry *old_dentry;
|
|
struct mnt_idmap *new_mnt_idmap;
|
|
struct inode *new_dir;
|
|
struct dentry *new_dentry;
|
|
struct inode **delegated_inode;
|
|
unsigned int flags;
|
|
} __randomize_layout;
|
|
|
|
int vfs_rename(struct renamedata *);
|
|
|
|
static inline int vfs_whiteout(struct mnt_idmap *idmap,
|
|
struct inode *dir, struct dentry *dentry)
|
|
{
|
|
return vfs_mknod(idmap, dir, dentry, S_IFCHR | WHITEOUT_MODE,
|
|
WHITEOUT_DEV);
|
|
}
|
|
|
|
struct file *kernel_tmpfile_open(struct mnt_idmap *idmap,
|
|
const struct path *parentpath,
|
|
umode_t mode, int open_flag,
|
|
const struct cred *cred);
|
|
struct file *kernel_file_open(const struct path *path, int flags,
|
|
struct inode *inode, const struct cred *cred);
|
|
|
|
int vfs_mkobj(struct dentry *, umode_t,
|
|
int (*f)(struct dentry *, umode_t, void *),
|
|
void *);
|
|
|
|
int vfs_fchown(struct file *file, uid_t user, gid_t group);
|
|
int vfs_fchmod(struct file *file, umode_t mode);
|
|
int vfs_utimes(const struct path *path, struct timespec64 *times);
|
|
|
|
extern long vfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
extern long compat_ptr_ioctl(struct file *file, unsigned int cmd,
|
|
unsigned long arg);
|
|
#else
|
|
#define compat_ptr_ioctl NULL
|
|
#endif
|
|
|
|
/*
|
|
* VFS file helper functions.
|
|
*/
|
|
void inode_init_owner(struct mnt_idmap *idmap, struct inode *inode,
|
|
const struct inode *dir, umode_t mode);
|
|
extern bool may_open_dev(const struct path *path);
|
|
umode_t mode_strip_sgid(struct mnt_idmap *idmap,
|
|
const struct inode *dir, umode_t mode);
|
|
|
|
/*
|
|
* This is the "filldir" function type, used by readdir() to let
|
|
* the kernel specify what kind of dirent layout it wants to have.
|
|
* This allows the kernel to read directories into kernel space or
|
|
* to have different dirent layouts depending on the binary type.
|
|
* Return 'true' to keep going and 'false' if there are no more entries.
|
|
*/
|
|
struct dir_context;
|
|
typedef bool (*filldir_t)(struct dir_context *, const char *, int, loff_t, u64,
|
|
unsigned);
|
|
|
|
struct dir_context {
|
|
filldir_t actor;
|
|
loff_t pos;
|
|
};
|
|
|
|
/*
|
|
* These flags let !MMU mmap() govern direct device mapping vs immediate
|
|
* copying more easily for MAP_PRIVATE, especially for ROM filesystems.
|
|
*
|
|
* NOMMU_MAP_COPY: Copy can be mapped (MAP_PRIVATE)
|
|
* NOMMU_MAP_DIRECT: Can be mapped directly (MAP_SHARED)
|
|
* NOMMU_MAP_READ: Can be mapped for reading
|
|
* NOMMU_MAP_WRITE: Can be mapped for writing
|
|
* NOMMU_MAP_EXEC: Can be mapped for execution
|
|
*/
|
|
#define NOMMU_MAP_COPY 0x00000001
|
|
#define NOMMU_MAP_DIRECT 0x00000008
|
|
#define NOMMU_MAP_READ VM_MAYREAD
|
|
#define NOMMU_MAP_WRITE VM_MAYWRITE
|
|
#define NOMMU_MAP_EXEC VM_MAYEXEC
|
|
|
|
#define NOMMU_VMFLAGS \
|
|
(NOMMU_MAP_READ | NOMMU_MAP_WRITE | NOMMU_MAP_EXEC)
|
|
|
|
/*
|
|
* These flags control the behavior of the remap_file_range function pointer.
|
|
* If it is called with len == 0 that means "remap to end of source file".
|
|
* See Documentation/filesystems/vfs.rst for more details about this call.
|
|
*
|
|
* REMAP_FILE_DEDUP: only remap if contents identical (i.e. deduplicate)
|
|
* REMAP_FILE_CAN_SHORTEN: caller can handle a shortened request
|
|
*/
|
|
#define REMAP_FILE_DEDUP (1 << 0)
|
|
#define REMAP_FILE_CAN_SHORTEN (1 << 1)
|
|
|
|
/*
|
|
* These flags signal that the caller is ok with altering various aspects of
|
|
* the behavior of the remap operation. The changes must be made by the
|
|
* implementation; the vfs remap helper functions can take advantage of them.
|
|
* Flags in this category exist to preserve the quirky behavior of the hoisted
|
|
* btrfs clone/dedupe ioctls.
|
|
*/
|
|
#define REMAP_FILE_ADVISORY (REMAP_FILE_CAN_SHORTEN)
|
|
|
|
/*
|
|
* These flags control the behavior of vfs_copy_file_range().
|
|
* They are not available to the user via syscall.
|
|
*
|
|
* COPY_FILE_SPLICE: call splice direct instead of fs clone/copy ops
|
|
*/
|
|
#define COPY_FILE_SPLICE (1 << 0)
|
|
|
|
struct iov_iter;
|
|
struct io_uring_cmd;
|
|
struct offset_ctx;
|
|
|
|
struct file_operations {
|
|
struct module *owner;
|
|
loff_t (*llseek) (struct file *, loff_t, int);
|
|
ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
|
|
ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
|
|
ssize_t (*read_iter) (struct kiocb *, struct iov_iter *);
|
|
ssize_t (*write_iter) (struct kiocb *, struct iov_iter *);
|
|
int (*iopoll)(struct kiocb *kiocb, struct io_comp_batch *,
|
|
unsigned int flags);
|
|
int (*iterate_shared) (struct file *, struct dir_context *);
|
|
__poll_t (*poll) (struct file *, struct poll_table_struct *);
|
|
long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
|
|
long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
|
|
int (*mmap) (struct file *, struct vm_area_struct *);
|
|
unsigned long mmap_supported_flags;
|
|
int (*open) (struct inode *, struct file *);
|
|
int (*flush) (struct file *, fl_owner_t id);
|
|
int (*release) (struct inode *, struct file *);
|
|
int (*fsync) (struct file *, loff_t, loff_t, int datasync);
|
|
int (*fasync) (int, struct file *, int);
|
|
int (*lock) (struct file *, int, struct file_lock *);
|
|
unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
|
|
int (*check_flags)(int);
|
|
int (*flock) (struct file *, int, struct file_lock *);
|
|
ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int);
|
|
ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int);
|
|
void (*splice_eof)(struct file *file);
|
|
int (*setlease)(struct file *, int, struct file_lease **, void **);
|
|
long (*fallocate)(struct file *file, int mode, loff_t offset,
|
|
loff_t len);
|
|
void (*show_fdinfo)(struct seq_file *m, struct file *f);
|
|
#ifndef CONFIG_MMU
|
|
unsigned (*mmap_capabilities)(struct file *);
|
|
#endif
|
|
ssize_t (*copy_file_range)(struct file *, loff_t, struct file *,
|
|
loff_t, size_t, unsigned int);
|
|
loff_t (*remap_file_range)(struct file *file_in, loff_t pos_in,
|
|
struct file *file_out, loff_t pos_out,
|
|
loff_t len, unsigned int remap_flags);
|
|
int (*fadvise)(struct file *, loff_t, loff_t, int);
|
|
int (*uring_cmd)(struct io_uring_cmd *ioucmd, unsigned int issue_flags);
|
|
int (*uring_cmd_iopoll)(struct io_uring_cmd *, struct io_comp_batch *,
|
|
unsigned int poll_flags);
|
|
} __randomize_layout;
|
|
|
|
/* Wrap a directory iterator that needs exclusive inode access */
|
|
int wrap_directory_iterator(struct file *, struct dir_context *,
|
|
int (*) (struct file *, struct dir_context *));
|
|
#define WRAP_DIR_ITER(x) \
|
|
static int shared_##x(struct file *file , struct dir_context *ctx) \
|
|
{ return wrap_directory_iterator(file, ctx, x); }
|
|
|
|
struct inode_operations {
|
|
struct dentry * (*lookup) (struct inode *,struct dentry *, unsigned int);
|
|
const char * (*get_link) (struct dentry *, struct inode *, struct delayed_call *);
|
|
int (*permission) (struct mnt_idmap *, struct inode *, int);
|
|
struct posix_acl * (*get_inode_acl)(struct inode *, int, bool);
|
|
|
|
int (*readlink) (struct dentry *, char __user *,int);
|
|
|
|
int (*create) (struct mnt_idmap *, struct inode *,struct dentry *,
|
|
umode_t, bool);
|
|
int (*link) (struct dentry *,struct inode *,struct dentry *);
|
|
int (*unlink) (struct inode *,struct dentry *);
|
|
int (*symlink) (struct mnt_idmap *, struct inode *,struct dentry *,
|
|
const char *);
|
|
int (*mkdir) (struct mnt_idmap *, struct inode *,struct dentry *,
|
|
umode_t);
|
|
int (*rmdir) (struct inode *,struct dentry *);
|
|
int (*mknod) (struct mnt_idmap *, struct inode *,struct dentry *,
|
|
umode_t,dev_t);
|
|
int (*rename) (struct mnt_idmap *, struct inode *, struct dentry *,
|
|
struct inode *, struct dentry *, unsigned int);
|
|
int (*setattr) (struct mnt_idmap *, struct dentry *, struct iattr *);
|
|
int (*getattr) (struct mnt_idmap *, const struct path *,
|
|
struct kstat *, u32, unsigned int);
|
|
ssize_t (*listxattr) (struct dentry *, char *, size_t);
|
|
int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start,
|
|
u64 len);
|
|
int (*update_time)(struct inode *, int);
|
|
int (*atomic_open)(struct inode *, struct dentry *,
|
|
struct file *, unsigned open_flag,
|
|
umode_t create_mode);
|
|
int (*tmpfile) (struct mnt_idmap *, struct inode *,
|
|
struct file *, umode_t);
|
|
struct posix_acl *(*get_acl)(struct mnt_idmap *, struct dentry *,
|
|
int);
|
|
int (*set_acl)(struct mnt_idmap *, struct dentry *,
|
|
struct posix_acl *, int);
|
|
int (*fileattr_set)(struct mnt_idmap *idmap,
|
|
struct dentry *dentry, struct fileattr *fa);
|
|
int (*fileattr_get)(struct dentry *dentry, struct fileattr *fa);
|
|
struct offset_ctx *(*get_offset_ctx)(struct inode *inode);
|
|
} ____cacheline_aligned;
|
|
|
|
static inline ssize_t call_read_iter(struct file *file, struct kiocb *kio,
|
|
struct iov_iter *iter)
|
|
{
|
|
return file->f_op->read_iter(kio, iter);
|
|
}
|
|
|
|
static inline ssize_t call_write_iter(struct file *file, struct kiocb *kio,
|
|
struct iov_iter *iter)
|
|
{
|
|
return file->f_op->write_iter(kio, iter);
|
|
}
|
|
|
|
static inline int call_mmap(struct file *file, struct vm_area_struct *vma)
|
|
{
|
|
return file->f_op->mmap(file, vma);
|
|
}
|
|
|
|
extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
|
|
extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
|
|
extern ssize_t vfs_copy_file_range(struct file *, loff_t , struct file *,
|
|
loff_t, size_t, unsigned int);
|
|
int __generic_remap_file_range_prep(struct file *file_in, loff_t pos_in,
|
|
struct file *file_out, loff_t pos_out,
|
|
loff_t *len, unsigned int remap_flags,
|
|
const struct iomap_ops *dax_read_ops);
|
|
int generic_remap_file_range_prep(struct file *file_in, loff_t pos_in,
|
|
struct file *file_out, loff_t pos_out,
|
|
loff_t *count, unsigned int remap_flags);
|
|
extern loff_t vfs_clone_file_range(struct file *file_in, loff_t pos_in,
|
|
struct file *file_out, loff_t pos_out,
|
|
loff_t len, unsigned int remap_flags);
|
|
extern int vfs_dedupe_file_range(struct file *file,
|
|
struct file_dedupe_range *same);
|
|
extern loff_t vfs_dedupe_file_range_one(struct file *src_file, loff_t src_pos,
|
|
struct file *dst_file, loff_t dst_pos,
|
|
loff_t len, unsigned int remap_flags);
|
|
|
|
/**
|
|
* enum freeze_holder - holder of the freeze
|
|
* @FREEZE_HOLDER_KERNEL: kernel wants to freeze or thaw filesystem
|
|
* @FREEZE_HOLDER_USERSPACE: userspace wants to freeze or thaw filesystem
|
|
* @FREEZE_MAY_NEST: whether nesting freeze and thaw requests is allowed
|
|
*
|
|
* Indicate who the owner of the freeze or thaw request is and whether
|
|
* the freeze needs to be exclusive or can nest.
|
|
* Without @FREEZE_MAY_NEST, multiple freeze and thaw requests from the
|
|
* same holder aren't allowed. It is however allowed to hold a single
|
|
* @FREEZE_HOLDER_USERSPACE and a single @FREEZE_HOLDER_KERNEL freeze at
|
|
* the same time. This is relied upon by some filesystems during online
|
|
* repair or similar.
|
|
*/
|
|
enum freeze_holder {
|
|
FREEZE_HOLDER_KERNEL = (1U << 0),
|
|
FREEZE_HOLDER_USERSPACE = (1U << 1),
|
|
FREEZE_MAY_NEST = (1U << 2),
|
|
};
|
|
|
|
struct super_operations {
|
|
struct inode *(*alloc_inode)(struct super_block *sb);
|
|
void (*destroy_inode)(struct inode *);
|
|
void (*free_inode)(struct inode *);
|
|
|
|
void (*dirty_inode) (struct inode *, int flags);
|
|
int (*write_inode) (struct inode *, struct writeback_control *wbc);
|
|
int (*drop_inode) (struct inode *);
|
|
void (*evict_inode) (struct inode *);
|
|
void (*put_super) (struct super_block *);
|
|
int (*sync_fs)(struct super_block *sb, int wait);
|
|
int (*freeze_super) (struct super_block *, enum freeze_holder who);
|
|
int (*freeze_fs) (struct super_block *);
|
|
int (*thaw_super) (struct super_block *, enum freeze_holder who);
|
|
int (*unfreeze_fs) (struct super_block *);
|
|
int (*statfs) (struct dentry *, struct kstatfs *);
|
|
int (*remount_fs) (struct super_block *, int *, char *);
|
|
void (*umount_begin) (struct super_block *);
|
|
|
|
int (*show_options)(struct seq_file *, struct dentry *);
|
|
int (*show_devname)(struct seq_file *, struct dentry *);
|
|
int (*show_path)(struct seq_file *, struct dentry *);
|
|
int (*show_stats)(struct seq_file *, struct dentry *);
|
|
#ifdef CONFIG_QUOTA
|
|
ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t);
|
|
ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);
|
|
struct dquot __rcu **(*get_dquots)(struct inode *);
|
|
#endif
|
|
long (*nr_cached_objects)(struct super_block *,
|
|
struct shrink_control *);
|
|
long (*free_cached_objects)(struct super_block *,
|
|
struct shrink_control *);
|
|
void (*shutdown)(struct super_block *sb);
|
|
};
|
|
|
|
/*
|
|
* Inode flags - they have no relation to superblock flags now
|
|
*/
|
|
#define S_SYNC (1 << 0) /* Writes are synced at once */
|
|
#define S_NOATIME (1 << 1) /* Do not update access times */
|
|
#define S_APPEND (1 << 2) /* Append-only file */
|
|
#define S_IMMUTABLE (1 << 3) /* Immutable file */
|
|
#define S_DEAD (1 << 4) /* removed, but still open directory */
|
|
#define S_NOQUOTA (1 << 5) /* Inode is not counted to quota */
|
|
#define S_DIRSYNC (1 << 6) /* Directory modifications are synchronous */
|
|
#define S_NOCMTIME (1 << 7) /* Do not update file c/mtime */
|
|
#define S_SWAPFILE (1 << 8) /* Do not truncate: swapon got its bmaps */
|
|
#define S_PRIVATE (1 << 9) /* Inode is fs-internal */
|
|
#define S_IMA (1 << 10) /* Inode has an associated IMA struct */
|
|
#define S_AUTOMOUNT (1 << 11) /* Automount/referral quasi-directory */
|
|
#define S_NOSEC (1 << 12) /* no suid or xattr security attributes */
|
|
#ifdef CONFIG_FS_DAX
|
|
#define S_DAX (1 << 13) /* Direct Access, avoiding the page cache */
|
|
#else
|
|
#define S_DAX 0 /* Make all the DAX code disappear */
|
|
#endif
|
|
#define S_ENCRYPTED (1 << 14) /* Encrypted file (using fs/crypto/) */
|
|
#define S_CASEFOLD (1 << 15) /* Casefolded file */
|
|
#define S_VERITY (1 << 16) /* Verity file (using fs/verity/) */
|
|
#define S_KERNEL_FILE (1 << 17) /* File is in use by the kernel (eg. fs/cachefiles) */
|
|
|
|
/*
|
|
* Note that nosuid etc flags are inode-specific: setting some file-system
|
|
* flags just means all the inodes inherit those flags by default. It might be
|
|
* possible to override it selectively if you really wanted to with some
|
|
* ioctl() that is not currently implemented.
|
|
*
|
|
* Exception: SB_RDONLY is always applied to the entire file system.
|
|
*
|
|
* Unfortunately, it is possible to change a filesystems flags with it mounted
|
|
* with files in use. This means that all of the inodes will not have their
|
|
* i_flags updated. Hence, i_flags no longer inherit the superblock mount
|
|
* flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
|
|
*/
|
|
#define __IS_FLG(inode, flg) ((inode)->i_sb->s_flags & (flg))
|
|
|
|
static inline bool sb_rdonly(const struct super_block *sb) { return sb->s_flags & SB_RDONLY; }
|
|
#define IS_RDONLY(inode) sb_rdonly((inode)->i_sb)
|
|
#define IS_SYNC(inode) (__IS_FLG(inode, SB_SYNCHRONOUS) || \
|
|
((inode)->i_flags & S_SYNC))
|
|
#define IS_DIRSYNC(inode) (__IS_FLG(inode, SB_SYNCHRONOUS|SB_DIRSYNC) || \
|
|
((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
|
|
#define IS_MANDLOCK(inode) __IS_FLG(inode, SB_MANDLOCK)
|
|
#define IS_NOATIME(inode) __IS_FLG(inode, SB_RDONLY|SB_NOATIME)
|
|
#define IS_I_VERSION(inode) __IS_FLG(inode, SB_I_VERSION)
|
|
|
|
#define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
|
|
#define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
|
|
#define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
|
|
|
|
#ifdef CONFIG_FS_POSIX_ACL
|
|
#define IS_POSIXACL(inode) __IS_FLG(inode, SB_POSIXACL)
|
|
#else
|
|
#define IS_POSIXACL(inode) 0
|
|
#endif
|
|
|
|
#define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
|
|
#define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
|
|
#define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
|
|
#define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
|
|
#define IS_IMA(inode) ((inode)->i_flags & S_IMA)
|
|
#define IS_AUTOMOUNT(inode) ((inode)->i_flags & S_AUTOMOUNT)
|
|
#define IS_NOSEC(inode) ((inode)->i_flags & S_NOSEC)
|
|
#define IS_DAX(inode) ((inode)->i_flags & S_DAX)
|
|
#define IS_ENCRYPTED(inode) ((inode)->i_flags & S_ENCRYPTED)
|
|
#define IS_CASEFOLDED(inode) ((inode)->i_flags & S_CASEFOLD)
|
|
#define IS_VERITY(inode) ((inode)->i_flags & S_VERITY)
|
|
|
|
#define IS_WHITEOUT(inode) (S_ISCHR(inode->i_mode) && \
|
|
(inode)->i_rdev == WHITEOUT_DEV)
|
|
|
|
static inline bool HAS_UNMAPPED_ID(struct mnt_idmap *idmap,
|
|
struct inode *inode)
|
|
{
|
|
return !vfsuid_valid(i_uid_into_vfsuid(idmap, inode)) ||
|
|
!vfsgid_valid(i_gid_into_vfsgid(idmap, inode));
|
|
}
|
|
|
|
static inline void init_sync_kiocb(struct kiocb *kiocb, struct file *filp)
|
|
{
|
|
*kiocb = (struct kiocb) {
|
|
.ki_filp = filp,
|
|
.ki_flags = filp->f_iocb_flags,
|
|
.ki_ioprio = get_current_ioprio(),
|
|
};
|
|
}
|
|
|
|
static inline void kiocb_clone(struct kiocb *kiocb, struct kiocb *kiocb_src,
|
|
struct file *filp)
|
|
{
|
|
*kiocb = (struct kiocb) {
|
|
.ki_filp = filp,
|
|
.ki_flags = kiocb_src->ki_flags,
|
|
.ki_ioprio = kiocb_src->ki_ioprio,
|
|
.ki_pos = kiocb_src->ki_pos,
|
|
};
|
|
}
|
|
|
|
/*
|
|
* Inode state bits. Protected by inode->i_lock
|
|
*
|
|
* Four bits determine the dirty state of the inode: I_DIRTY_SYNC,
|
|
* I_DIRTY_DATASYNC, I_DIRTY_PAGES, and I_DIRTY_TIME.
|
|
*
|
|
* Four bits define the lifetime of an inode. Initially, inodes are I_NEW,
|
|
* until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at
|
|
* various stages of removing an inode.
|
|
*
|
|
* Two bits are used for locking and completion notification, I_NEW and I_SYNC.
|
|
*
|
|
* I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on
|
|
* fdatasync() (unless I_DIRTY_DATASYNC is also set).
|
|
* Timestamp updates are the usual cause.
|
|
* I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of
|
|
* these changes separately from I_DIRTY_SYNC so that we
|
|
* don't have to write inode on fdatasync() when only
|
|
* e.g. the timestamps have changed.
|
|
* I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean.
|
|
* I_DIRTY_TIME The inode itself has dirty timestamps, and the
|
|
* lazytime mount option is enabled. We keep track of this
|
|
* separately from I_DIRTY_SYNC in order to implement
|
|
* lazytime. This gets cleared if I_DIRTY_INODE
|
|
* (I_DIRTY_SYNC and/or I_DIRTY_DATASYNC) gets set. But
|
|
* I_DIRTY_TIME can still be set if I_DIRTY_SYNC is already
|
|
* in place because writeback might already be in progress
|
|
* and we don't want to lose the time update
|
|
* I_NEW Serves as both a mutex and completion notification.
|
|
* New inodes set I_NEW. If two processes both create
|
|
* the same inode, one of them will release its inode and
|
|
* wait for I_NEW to be released before returning.
|
|
* Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can
|
|
* also cause waiting on I_NEW, without I_NEW actually
|
|
* being set. find_inode() uses this to prevent returning
|
|
* nearly-dead inodes.
|
|
* I_WILL_FREE Must be set when calling write_inode_now() if i_count
|
|
* is zero. I_FREEING must be set when I_WILL_FREE is
|
|
* cleared.
|
|
* I_FREEING Set when inode is about to be freed but still has dirty
|
|
* pages or buffers attached or the inode itself is still
|
|
* dirty.
|
|
* I_CLEAR Added by clear_inode(). In this state the inode is
|
|
* clean and can be destroyed. Inode keeps I_FREEING.
|
|
*
|
|
* Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are
|
|
* prohibited for many purposes. iget() must wait for
|
|
* the inode to be completely released, then create it
|
|
* anew. Other functions will just ignore such inodes,
|
|
* if appropriate. I_NEW is used for waiting.
|
|
*
|
|
* I_SYNC Writeback of inode is running. The bit is set during
|
|
* data writeback, and cleared with a wakeup on the bit
|
|
* address once it is done. The bit is also used to pin
|
|
* the inode in memory for flusher thread.
|
|
*
|
|
* I_REFERENCED Marks the inode as recently references on the LRU list.
|
|
*
|
|
* I_DIO_WAKEUP Never set. Only used as a key for wait_on_bit().
|
|
*
|
|
* I_WB_SWITCH Cgroup bdi_writeback switching in progress. Used to
|
|
* synchronize competing switching instances and to tell
|
|
* wb stat updates to grab the i_pages lock. See
|
|
* inode_switch_wbs_work_fn() for details.
|
|
*
|
|
* I_OVL_INUSE Used by overlayfs to get exclusive ownership on upper
|
|
* and work dirs among overlayfs mounts.
|
|
*
|
|
* I_CREATING New object's inode in the middle of setting up.
|
|
*
|
|
* I_DONTCACHE Evict inode as soon as it is not used anymore.
|
|
*
|
|
* I_SYNC_QUEUED Inode is queued in b_io or b_more_io writeback lists.
|
|
* Used to detect that mark_inode_dirty() should not move
|
|
* inode between dirty lists.
|
|
*
|
|
* I_PINNING_FSCACHE_WB Inode is pinning an fscache object for writeback.
|
|
*
|
|
* Q: What is the difference between I_WILL_FREE and I_FREEING?
|
|
*/
|
|
#define I_DIRTY_SYNC (1 << 0)
|
|
#define I_DIRTY_DATASYNC (1 << 1)
|
|
#define I_DIRTY_PAGES (1 << 2)
|
|
#define __I_NEW 3
|
|
#define I_NEW (1 << __I_NEW)
|
|
#define I_WILL_FREE (1 << 4)
|
|
#define I_FREEING (1 << 5)
|
|
#define I_CLEAR (1 << 6)
|
|
#define __I_SYNC 7
|
|
#define I_SYNC (1 << __I_SYNC)
|
|
#define I_REFERENCED (1 << 8)
|
|
#define __I_DIO_WAKEUP 9
|
|
#define I_DIO_WAKEUP (1 << __I_DIO_WAKEUP)
|
|
#define I_LINKABLE (1 << 10)
|
|
#define I_DIRTY_TIME (1 << 11)
|
|
#define I_WB_SWITCH (1 << 13)
|
|
#define I_OVL_INUSE (1 << 14)
|
|
#define I_CREATING (1 << 15)
|
|
#define I_DONTCACHE (1 << 16)
|
|
#define I_SYNC_QUEUED (1 << 17)
|
|
#define I_PINNING_NETFS_WB (1 << 18)
|
|
|
|
#define I_DIRTY_INODE (I_DIRTY_SYNC | I_DIRTY_DATASYNC)
|
|
#define I_DIRTY (I_DIRTY_INODE | I_DIRTY_PAGES)
|
|
#define I_DIRTY_ALL (I_DIRTY | I_DIRTY_TIME)
|
|
|
|
extern void __mark_inode_dirty(struct inode *, int);
|
|
static inline void mark_inode_dirty(struct inode *inode)
|
|
{
|
|
__mark_inode_dirty(inode, I_DIRTY);
|
|
}
|
|
|
|
static inline void mark_inode_dirty_sync(struct inode *inode)
|
|
{
|
|
__mark_inode_dirty(inode, I_DIRTY_SYNC);
|
|
}
|
|
|
|
/*
|
|
* Returns true if the given inode itself only has dirty timestamps (its pages
|
|
* may still be dirty) and isn't currently being allocated or freed.
|
|
* Filesystems should call this if when writing an inode when lazytime is
|
|
* enabled, they want to opportunistically write the timestamps of other inodes
|
|
* located very nearby on-disk, e.g. in the same inode block. This returns true
|
|
* if the given inode is in need of such an opportunistic update. Requires
|
|
* i_lock, or at least later re-checking under i_lock.
|
|
*/
|
|
static inline bool inode_is_dirtytime_only(struct inode *inode)
|
|
{
|
|
return (inode->i_state & (I_DIRTY_TIME | I_NEW |
|
|
I_FREEING | I_WILL_FREE)) == I_DIRTY_TIME;
|
|
}
|
|
|
|
extern void inc_nlink(struct inode *inode);
|
|
extern void drop_nlink(struct inode *inode);
|
|
extern void clear_nlink(struct inode *inode);
|
|
extern void set_nlink(struct inode *inode, unsigned int nlink);
|
|
|
|
static inline void inode_inc_link_count(struct inode *inode)
|
|
{
|
|
inc_nlink(inode);
|
|
mark_inode_dirty(inode);
|
|
}
|
|
|
|
static inline void inode_dec_link_count(struct inode *inode)
|
|
{
|
|
drop_nlink(inode);
|
|
mark_inode_dirty(inode);
|
|
}
|
|
|
|
enum file_time_flags {
|
|
S_ATIME = 1,
|
|
S_MTIME = 2,
|
|
S_CTIME = 4,
|
|
S_VERSION = 8,
|
|
};
|
|
|
|
extern bool atime_needs_update(const struct path *, struct inode *);
|
|
extern void touch_atime(const struct path *);
|
|
int inode_update_time(struct inode *inode, int flags);
|
|
|
|
static inline void file_accessed(struct file *file)
|
|
{
|
|
if (!(file->f_flags & O_NOATIME))
|
|
touch_atime(&file->f_path);
|
|
}
|
|
|
|
extern int file_modified(struct file *file);
|
|
int kiocb_modified(struct kiocb *iocb);
|
|
|
|
int sync_inode_metadata(struct inode *inode, int wait);
|
|
|
|
struct file_system_type {
|
|
const char *name;
|
|
int fs_flags;
|
|
#define FS_REQUIRES_DEV 1
|
|
#define FS_BINARY_MOUNTDATA 2
|
|
#define FS_HAS_SUBTYPE 4
|
|
#define FS_USERNS_MOUNT 8 /* Can be mounted by userns root */
|
|
#define FS_DISALLOW_NOTIFY_PERM 16 /* Disable fanotify permission events */
|
|
#define FS_ALLOW_IDMAP 32 /* FS has been updated to handle vfs idmappings. */
|
|
#define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move() during rename() internally. */
|
|
int (*init_fs_context)(struct fs_context *);
|
|
const struct fs_parameter_spec *parameters;
|
|
struct dentry *(*mount) (struct file_system_type *, int,
|
|
const char *, void *);
|
|
void (*kill_sb) (struct super_block *);
|
|
struct module *owner;
|
|
struct file_system_type * next;
|
|
struct hlist_head fs_supers;
|
|
|
|
struct lock_class_key s_lock_key;
|
|
struct lock_class_key s_umount_key;
|
|
struct lock_class_key s_vfs_rename_key;
|
|
struct lock_class_key s_writers_key[SB_FREEZE_LEVELS];
|
|
|
|
struct lock_class_key i_lock_key;
|
|
struct lock_class_key i_mutex_key;
|
|
struct lock_class_key invalidate_lock_key;
|
|
struct lock_class_key i_mutex_dir_key;
|
|
};
|
|
|
|
#define MODULE_ALIAS_FS(NAME) MODULE_ALIAS("fs-" NAME)
|
|
|
|
extern struct dentry *mount_bdev(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data,
|
|
int (*fill_super)(struct super_block *, void *, int));
|
|
extern struct dentry *mount_single(struct file_system_type *fs_type,
|
|
int flags, void *data,
|
|
int (*fill_super)(struct super_block *, void *, int));
|
|
extern struct dentry *mount_nodev(struct file_system_type *fs_type,
|
|
int flags, void *data,
|
|
int (*fill_super)(struct super_block *, void *, int));
|
|
extern struct dentry *mount_subtree(struct vfsmount *mnt, const char *path);
|
|
void retire_super(struct super_block *sb);
|
|
void generic_shutdown_super(struct super_block *sb);
|
|
void kill_block_super(struct super_block *sb);
|
|
void kill_anon_super(struct super_block *sb);
|
|
void kill_litter_super(struct super_block *sb);
|
|
void deactivate_super(struct super_block *sb);
|
|
void deactivate_locked_super(struct super_block *sb);
|
|
int set_anon_super(struct super_block *s, void *data);
|
|
int set_anon_super_fc(struct super_block *s, struct fs_context *fc);
|
|
int get_anon_bdev(dev_t *);
|
|
void free_anon_bdev(dev_t);
|
|
struct super_block *sget_fc(struct fs_context *fc,
|
|
int (*test)(struct super_block *, struct fs_context *),
|
|
int (*set)(struct super_block *, struct fs_context *));
|
|
struct super_block *sget(struct file_system_type *type,
|
|
int (*test)(struct super_block *,void *),
|
|
int (*set)(struct super_block *,void *),
|
|
int flags, void *data);
|
|
struct super_block *sget_dev(struct fs_context *fc, dev_t dev);
|
|
|
|
/* Alas, no aliases. Too much hassle with bringing module.h everywhere */
|
|
#define fops_get(fops) \
|
|
(((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
|
|
#define fops_put(fops) \
|
|
do { if (fops) module_put((fops)->owner); } while(0)
|
|
/*
|
|
* This one is to be used *ONLY* from ->open() instances.
|
|
* fops must be non-NULL, pinned down *and* module dependencies
|
|
* should be sufficient to pin the caller down as well.
|
|
*/
|
|
#define replace_fops(f, fops) \
|
|
do { \
|
|
struct file *__file = (f); \
|
|
fops_put(__file->f_op); \
|
|
BUG_ON(!(__file->f_op = (fops))); \
|
|
} while(0)
|
|
|
|
extern int register_filesystem(struct file_system_type *);
|
|
extern int unregister_filesystem(struct file_system_type *);
|
|
extern int vfs_statfs(const struct path *, struct kstatfs *);
|
|
extern int user_statfs(const char __user *, struct kstatfs *);
|
|
extern int fd_statfs(int, struct kstatfs *);
|
|
int freeze_super(struct super_block *super, enum freeze_holder who);
|
|
int thaw_super(struct super_block *super, enum freeze_holder who);
|
|
extern __printf(2, 3)
|
|
int super_setup_bdi_name(struct super_block *sb, char *fmt, ...);
|
|
extern int super_setup_bdi(struct super_block *sb);
|
|
|
|
static inline void super_set_uuid(struct super_block *sb, const u8 *uuid, unsigned len)
|
|
{
|
|
if (WARN_ON(len > sizeof(sb->s_uuid)))
|
|
len = sizeof(sb->s_uuid);
|
|
sb->s_uuid_len = len;
|
|
memcpy(&sb->s_uuid, uuid, len);
|
|
}
|
|
|
|
/* set sb sysfs name based on sb->s_bdev */
|
|
static inline void super_set_sysfs_name_bdev(struct super_block *sb)
|
|
{
|
|
snprintf(sb->s_sysfs_name, sizeof(sb->s_sysfs_name), "%pg", sb->s_bdev);
|
|
}
|
|
|
|
/* set sb sysfs name based on sb->s_uuid */
|
|
static inline void super_set_sysfs_name_uuid(struct super_block *sb)
|
|
{
|
|
WARN_ON(sb->s_uuid_len != sizeof(sb->s_uuid));
|
|
snprintf(sb->s_sysfs_name, sizeof(sb->s_sysfs_name), "%pU", sb->s_uuid.b);
|
|
}
|
|
|
|
/* set sb sysfs name based on sb->s_id */
|
|
static inline void super_set_sysfs_name_id(struct super_block *sb)
|
|
{
|
|
strscpy(sb->s_sysfs_name, sb->s_id, sizeof(sb->s_sysfs_name));
|
|
}
|
|
|
|
/* try to use something standard before you use this */
|
|
__printf(2, 3)
|
|
static inline void super_set_sysfs_name_generic(struct super_block *sb, const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
|
|
va_start(args, fmt);
|
|
vsnprintf(sb->s_sysfs_name, sizeof(sb->s_sysfs_name), fmt, args);
|
|
va_end(args);
|
|
}
|
|
|
|
extern int current_umask(void);
|
|
|
|
extern void ihold(struct inode * inode);
|
|
extern void iput(struct inode *);
|
|
int inode_update_timestamps(struct inode *inode, int flags);
|
|
int generic_update_time(struct inode *, int);
|
|
|
|
/* /sys/fs */
|
|
extern struct kobject *fs_kobj;
|
|
|
|
#define MAX_RW_COUNT (INT_MAX & PAGE_MASK)
|
|
|
|
/* fs/open.c */
|
|
struct audit_names;
|
|
struct filename {
|
|
const char *name; /* pointer to actual string */
|
|
const __user char *uptr; /* original userland pointer */
|
|
atomic_t refcnt;
|
|
struct audit_names *aname;
|
|
const char iname[];
|
|
};
|
|
static_assert(offsetof(struct filename, iname) % sizeof(long) == 0);
|
|
|
|
static inline struct mnt_idmap *file_mnt_idmap(const struct file *file)
|
|
{
|
|
return mnt_idmap(file->f_path.mnt);
|
|
}
|
|
|
|
/**
|
|
* is_idmapped_mnt - check whether a mount is mapped
|
|
* @mnt: the mount to check
|
|
*
|
|
* If @mnt has an non @nop_mnt_idmap attached to it then @mnt is mapped.
|
|
*
|
|
* Return: true if mount is mapped, false if not.
|
|
*/
|
|
static inline bool is_idmapped_mnt(const struct vfsmount *mnt)
|
|
{
|
|
return mnt_idmap(mnt) != &nop_mnt_idmap;
|
|
}
|
|
|
|
extern long vfs_truncate(const struct path *, loff_t);
|
|
int do_truncate(struct mnt_idmap *, struct dentry *, loff_t start,
|
|
unsigned int time_attrs, struct file *filp);
|
|
extern int vfs_fallocate(struct file *file, int mode, loff_t offset,
|
|
loff_t len);
|
|
extern long do_sys_open(int dfd, const char __user *filename, int flags,
|
|
umode_t mode);
|
|
extern struct file *file_open_name(struct filename *, int, umode_t);
|
|
extern struct file *filp_open(const char *, int, umode_t);
|
|
extern struct file *file_open_root(const struct path *,
|
|
const char *, int, umode_t);
|
|
static inline struct file *file_open_root_mnt(struct vfsmount *mnt,
|
|
const char *name, int flags, umode_t mode)
|
|
{
|
|
return file_open_root(&(struct path){.mnt = mnt, .dentry = mnt->mnt_root},
|
|
name, flags, mode);
|
|
}
|
|
struct file *dentry_open(const struct path *path, int flags,
|
|
const struct cred *creds);
|
|
struct file *dentry_create(const struct path *path, int flags, umode_t mode,
|
|
const struct cred *cred);
|
|
struct path *backing_file_user_path(struct file *f);
|
|
|
|
/*
|
|
* When mmapping a file on a stackable filesystem (e.g., overlayfs), the file
|
|
* stored in ->vm_file is a backing file whose f_inode is on the underlying
|
|
* filesystem. When the mapped file path and inode number are displayed to
|
|
* user (e.g. via /proc/<pid>/maps), these helpers should be used to get the
|
|
* path and inode number to display to the user, which is the path of the fd
|
|
* that user has requested to map and the inode number that would be returned
|
|
* by fstat() on that same fd.
|
|
*/
|
|
/* Get the path to display in /proc/<pid>/maps */
|
|
static inline const struct path *file_user_path(struct file *f)
|
|
{
|
|
if (unlikely(f->f_mode & FMODE_BACKING))
|
|
return backing_file_user_path(f);
|
|
return &f->f_path;
|
|
}
|
|
/* Get the inode whose inode number to display in /proc/<pid>/maps */
|
|
static inline const struct inode *file_user_inode(struct file *f)
|
|
{
|
|
if (unlikely(f->f_mode & FMODE_BACKING))
|
|
return d_inode(backing_file_user_path(f)->dentry);
|
|
return file_inode(f);
|
|
}
|
|
|
|
static inline struct file *file_clone_open(struct file *file)
|
|
{
|
|
return dentry_open(&file->f_path, file->f_flags, file->f_cred);
|
|
}
|
|
extern int filp_close(struct file *, fl_owner_t id);
|
|
|
|
extern struct filename *getname_flags(const char __user *, int, int *);
|
|
extern struct filename *getname_uflags(const char __user *, int);
|
|
extern struct filename *getname(const char __user *);
|
|
extern struct filename *getname_kernel(const char *);
|
|
extern void putname(struct filename *name);
|
|
|
|
extern int finish_open(struct file *file, struct dentry *dentry,
|
|
int (*open)(struct inode *, struct file *));
|
|
extern int finish_no_open(struct file *file, struct dentry *dentry);
|
|
|
|
/* Helper for the simple case when original dentry is used */
|
|
static inline int finish_open_simple(struct file *file, int error)
|
|
{
|
|
if (error)
|
|
return error;
|
|
|
|
return finish_open(file, file->f_path.dentry, NULL);
|
|
}
|
|
|
|
/* fs/dcache.c */
|
|
extern void __init vfs_caches_init_early(void);
|
|
extern void __init vfs_caches_init(void);
|
|
|
|
extern struct kmem_cache *names_cachep;
|
|
|
|
#define __getname() kmem_cache_alloc(names_cachep, GFP_KERNEL)
|
|
#define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
|
|
|
|
extern struct super_block *blockdev_superblock;
|
|
static inline bool sb_is_blkdev_sb(struct super_block *sb)
|
|
{
|
|
return IS_ENABLED(CONFIG_BLOCK) && sb == blockdev_superblock;
|
|
}
|
|
|
|
void emergency_thaw_all(void);
|
|
extern int sync_filesystem(struct super_block *);
|
|
extern const struct file_operations def_blk_fops;
|
|
extern const struct file_operations def_chr_fops;
|
|
|
|
/* fs/char_dev.c */
|
|
#define CHRDEV_MAJOR_MAX 512
|
|
/* Marks the bottom of the first segment of free char majors */
|
|
#define CHRDEV_MAJOR_DYN_END 234
|
|
/* Marks the top and bottom of the second segment of free char majors */
|
|
#define CHRDEV_MAJOR_DYN_EXT_START 511
|
|
#define CHRDEV_MAJOR_DYN_EXT_END 384
|
|
|
|
extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *);
|
|
extern int register_chrdev_region(dev_t, unsigned, const char *);
|
|
extern int __register_chrdev(unsigned int major, unsigned int baseminor,
|
|
unsigned int count, const char *name,
|
|
const struct file_operations *fops);
|
|
extern void __unregister_chrdev(unsigned int major, unsigned int baseminor,
|
|
unsigned int count, const char *name);
|
|
extern void unregister_chrdev_region(dev_t, unsigned);
|
|
extern void chrdev_show(struct seq_file *,off_t);
|
|
|
|
static inline int register_chrdev(unsigned int major, const char *name,
|
|
const struct file_operations *fops)
|
|
{
|
|
return __register_chrdev(major, 0, 256, name, fops);
|
|
}
|
|
|
|
static inline void unregister_chrdev(unsigned int major, const char *name)
|
|
{
|
|
__unregister_chrdev(major, 0, 256, name);
|
|
}
|
|
|
|
extern void init_special_inode(struct inode *, umode_t, dev_t);
|
|
|
|
/* Invalid inode operations -- fs/bad_inode.c */
|
|
extern void make_bad_inode(struct inode *);
|
|
extern bool is_bad_inode(struct inode *);
|
|
|
|
extern int __must_check file_fdatawait_range(struct file *file, loff_t lstart,
|
|
loff_t lend);
|
|
extern int __must_check file_check_and_advance_wb_err(struct file *file);
|
|
extern int __must_check file_write_and_wait_range(struct file *file,
|
|
loff_t start, loff_t end);
|
|
|
|
static inline int file_write_and_wait(struct file *file)
|
|
{
|
|
return file_write_and_wait_range(file, 0, LLONG_MAX);
|
|
}
|
|
|
|
extern int vfs_fsync_range(struct file *file, loff_t start, loff_t end,
|
|
int datasync);
|
|
extern int vfs_fsync(struct file *file, int datasync);
|
|
|
|
extern int sync_file_range(struct file *file, loff_t offset, loff_t nbytes,
|
|
unsigned int flags);
|
|
|
|
static inline bool iocb_is_dsync(const struct kiocb *iocb)
|
|
{
|
|
return (iocb->ki_flags & IOCB_DSYNC) ||
|
|
IS_SYNC(iocb->ki_filp->f_mapping->host);
|
|
}
|
|
|
|
/*
|
|
* Sync the bytes written if this was a synchronous write. Expect ki_pos
|
|
* to already be updated for the write, and will return either the amount
|
|
* of bytes passed in, or an error if syncing the file failed.
|
|
*/
|
|
static inline ssize_t generic_write_sync(struct kiocb *iocb, ssize_t count)
|
|
{
|
|
if (iocb_is_dsync(iocb)) {
|
|
int ret = vfs_fsync_range(iocb->ki_filp,
|
|
iocb->ki_pos - count, iocb->ki_pos - 1,
|
|
(iocb->ki_flags & IOCB_SYNC) ? 0 : 1);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
extern void emergency_sync(void);
|
|
extern void emergency_remount(void);
|
|
|
|
#ifdef CONFIG_BLOCK
|
|
extern int bmap(struct inode *inode, sector_t *block);
|
|
#else
|
|
static inline int bmap(struct inode *inode, sector_t *block)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
#endif
|
|
|
|
int notify_change(struct mnt_idmap *, struct dentry *,
|
|
struct iattr *, struct inode **);
|
|
int inode_permission(struct mnt_idmap *, struct inode *, int);
|
|
int generic_permission(struct mnt_idmap *, struct inode *, int);
|
|
static inline int file_permission(struct file *file, int mask)
|
|
{
|
|
return inode_permission(file_mnt_idmap(file),
|
|
file_inode(file), mask);
|
|
}
|
|
static inline int path_permission(const struct path *path, int mask)
|
|
{
|
|
return inode_permission(mnt_idmap(path->mnt),
|
|
d_inode(path->dentry), mask);
|
|
}
|
|
int __check_sticky(struct mnt_idmap *idmap, struct inode *dir,
|
|
struct inode *inode);
|
|
|
|
static inline bool execute_ok(struct inode *inode)
|
|
{
|
|
return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode);
|
|
}
|
|
|
|
static inline bool inode_wrong_type(const struct inode *inode, umode_t mode)
|
|
{
|
|
return (inode->i_mode ^ mode) & S_IFMT;
|
|
}
|
|
|
|
/**
|
|
* file_start_write - get write access to a superblock for regular file io
|
|
* @file: the file we want to write to
|
|
*
|
|
* This is a variant of sb_start_write() which is a noop on non-regualr file.
|
|
* Should be matched with a call to file_end_write().
|
|
*/
|
|
static inline void file_start_write(struct file *file)
|
|
{
|
|
if (!S_ISREG(file_inode(file)->i_mode))
|
|
return;
|
|
sb_start_write(file_inode(file)->i_sb);
|
|
}
|
|
|
|
static inline bool file_start_write_trylock(struct file *file)
|
|
{
|
|
if (!S_ISREG(file_inode(file)->i_mode))
|
|
return true;
|
|
return sb_start_write_trylock(file_inode(file)->i_sb);
|
|
}
|
|
|
|
/**
|
|
* file_end_write - drop write access to a superblock of a regular file
|
|
* @file: the file we wrote to
|
|
*
|
|
* Should be matched with a call to file_start_write().
|
|
*/
|
|
static inline void file_end_write(struct file *file)
|
|
{
|
|
if (!S_ISREG(file_inode(file)->i_mode))
|
|
return;
|
|
sb_end_write(file_inode(file)->i_sb);
|
|
}
|
|
|
|
/**
|
|
* kiocb_start_write - get write access to a superblock for async file io
|
|
* @iocb: the io context we want to submit the write with
|
|
*
|
|
* This is a variant of sb_start_write() for async io submission.
|
|
* Should be matched with a call to kiocb_end_write().
|
|
*/
|
|
static inline void kiocb_start_write(struct kiocb *iocb)
|
|
{
|
|
struct inode *inode = file_inode(iocb->ki_filp);
|
|
|
|
sb_start_write(inode->i_sb);
|
|
/*
|
|
* Fool lockdep by telling it the lock got released so that it
|
|
* doesn't complain about the held lock when we return to userspace.
|
|
*/
|
|
__sb_writers_release(inode->i_sb, SB_FREEZE_WRITE);
|
|
}
|
|
|
|
/**
|
|
* kiocb_end_write - drop write access to a superblock after async file io
|
|
* @iocb: the io context we sumbitted the write with
|
|
*
|
|
* Should be matched with a call to kiocb_start_write().
|
|
*/
|
|
static inline void kiocb_end_write(struct kiocb *iocb)
|
|
{
|
|
struct inode *inode = file_inode(iocb->ki_filp);
|
|
|
|
/*
|
|
* Tell lockdep we inherited freeze protection from submission thread.
|
|
*/
|
|
__sb_writers_acquired(inode->i_sb, SB_FREEZE_WRITE);
|
|
sb_end_write(inode->i_sb);
|
|
}
|
|
|
|
/*
|
|
* This is used for regular files where some users -- especially the
|
|
* currently executed binary in a process, previously handled via
|
|
* VM_DENYWRITE -- cannot handle concurrent write (and maybe mmap
|
|
* read-write shared) accesses.
|
|
*
|
|
* get_write_access() gets write permission for a file.
|
|
* put_write_access() releases this write permission.
|
|
* deny_write_access() denies write access to a file.
|
|
* allow_write_access() re-enables write access to a file.
|
|
*
|
|
* The i_writecount field of an inode can have the following values:
|
|
* 0: no write access, no denied write access
|
|
* < 0: (-i_writecount) users that denied write access to the file.
|
|
* > 0: (i_writecount) users that have write access to the file.
|
|
*
|
|
* Normally we operate on that counter with atomic_{inc,dec} and it's safe
|
|
* except for the cases where we don't hold i_writecount yet. Then we need to
|
|
* use {get,deny}_write_access() - these functions check the sign and refuse
|
|
* to do the change if sign is wrong.
|
|
*/
|
|
static inline int get_write_access(struct inode *inode)
|
|
{
|
|
return atomic_inc_unless_negative(&inode->i_writecount) ? 0 : -ETXTBSY;
|
|
}
|
|
static inline int deny_write_access(struct file *file)
|
|
{
|
|
struct inode *inode = file_inode(file);
|
|
return atomic_dec_unless_positive(&inode->i_writecount) ? 0 : -ETXTBSY;
|
|
}
|
|
static inline void put_write_access(struct inode * inode)
|
|
{
|
|
atomic_dec(&inode->i_writecount);
|
|
}
|
|
static inline void allow_write_access(struct file *file)
|
|
{
|
|
if (file)
|
|
atomic_inc(&file_inode(file)->i_writecount);
|
|
}
|
|
static inline bool inode_is_open_for_write(const struct inode *inode)
|
|
{
|
|
return atomic_read(&inode->i_writecount) > 0;
|
|
}
|
|
|
|
#if defined(CONFIG_IMA) || defined(CONFIG_FILE_LOCKING)
|
|
static inline void i_readcount_dec(struct inode *inode)
|
|
{
|
|
BUG_ON(atomic_dec_return(&inode->i_readcount) < 0);
|
|
}
|
|
static inline void i_readcount_inc(struct inode *inode)
|
|
{
|
|
atomic_inc(&inode->i_readcount);
|
|
}
|
|
#else
|
|
static inline void i_readcount_dec(struct inode *inode)
|
|
{
|
|
return;
|
|
}
|
|
static inline void i_readcount_inc(struct inode *inode)
|
|
{
|
|
return;
|
|
}
|
|
#endif
|
|
extern int do_pipe_flags(int *, int);
|
|
|
|
extern ssize_t kernel_read(struct file *, void *, size_t, loff_t *);
|
|
ssize_t __kernel_read(struct file *file, void *buf, size_t count, loff_t *pos);
|
|
extern ssize_t kernel_write(struct file *, const void *, size_t, loff_t *);
|
|
extern ssize_t __kernel_write(struct file *, const void *, size_t, loff_t *);
|
|
extern struct file * open_exec(const char *);
|
|
|
|
/* fs/dcache.c -- generic fs support functions */
|
|
extern bool is_subdir(struct dentry *, struct dentry *);
|
|
extern bool path_is_under(const struct path *, const struct path *);
|
|
|
|
extern char *file_path(struct file *, char *, int);
|
|
|
|
/**
|
|
* is_dot_dotdot - returns true only if @name is "." or ".."
|
|
* @name: file name to check
|
|
* @len: length of file name, in bytes
|
|
*/
|
|
static inline bool is_dot_dotdot(const char *name, size_t len)
|
|
{
|
|
return len && unlikely(name[0] == '.') &&
|
|
(len == 1 || (len == 2 && name[1] == '.'));
|
|
}
|
|
|
|
#include <linux/err.h>
|
|
|
|
/* needed for stackable file system support */
|
|
extern loff_t default_llseek(struct file *file, loff_t offset, int whence);
|
|
|
|
extern loff_t vfs_llseek(struct file *file, loff_t offset, int whence);
|
|
|
|
extern int inode_init_always(struct super_block *, struct inode *);
|
|
extern void inode_init_once(struct inode *);
|
|
extern void address_space_init_once(struct address_space *mapping);
|
|
extern struct inode * igrab(struct inode *);
|
|
extern ino_t iunique(struct super_block *, ino_t);
|
|
extern int inode_needs_sync(struct inode *inode);
|
|
extern int generic_delete_inode(struct inode *inode);
|
|
static inline int generic_drop_inode(struct inode *inode)
|
|
{
|
|
return !inode->i_nlink || inode_unhashed(inode);
|
|
}
|
|
extern void d_mark_dontcache(struct inode *inode);
|
|
|
|
extern struct inode *ilookup5_nowait(struct super_block *sb,
|
|
unsigned long hashval, int (*test)(struct inode *, void *),
|
|
void *data);
|
|
extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
|
|
int (*test)(struct inode *, void *), void *data);
|
|
extern struct inode *ilookup(struct super_block *sb, unsigned long ino);
|
|
|
|
extern struct inode *inode_insert5(struct inode *inode, unsigned long hashval,
|
|
int (*test)(struct inode *, void *),
|
|
int (*set)(struct inode *, void *),
|
|
void *data);
|
|
extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *);
|
|
extern struct inode * iget_locked(struct super_block *, unsigned long);
|
|
extern struct inode *find_inode_nowait(struct super_block *,
|
|
unsigned long,
|
|
int (*match)(struct inode *,
|
|
unsigned long, void *),
|
|
void *data);
|
|
extern struct inode *find_inode_rcu(struct super_block *, unsigned long,
|
|
int (*)(struct inode *, void *), void *);
|
|
extern struct inode *find_inode_by_ino_rcu(struct super_block *, unsigned long);
|
|
extern int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *);
|
|
extern int insert_inode_locked(struct inode *);
|
|
#ifdef CONFIG_DEBUG_LOCK_ALLOC
|
|
extern void lockdep_annotate_inode_mutex_key(struct inode *inode);
|
|
#else
|
|
static inline void lockdep_annotate_inode_mutex_key(struct inode *inode) { };
|
|
#endif
|
|
extern void unlock_new_inode(struct inode *);
|
|
extern void discard_new_inode(struct inode *);
|
|
extern unsigned int get_next_ino(void);
|
|
extern void evict_inodes(struct super_block *sb);
|
|
void dump_mapping(const struct address_space *);
|
|
|
|
/*
|
|
* Userspace may rely on the inode number being non-zero. For example, glibc
|
|
* simply ignores files with zero i_ino in unlink() and other places.
|
|
*
|
|
* As an additional complication, if userspace was compiled with
|
|
* _FILE_OFFSET_BITS=32 on a 64-bit kernel we'll only end up reading out the
|
|
* lower 32 bits, so we need to check that those aren't zero explicitly. With
|
|
* _FILE_OFFSET_BITS=64, this may cause some harmless false-negatives, but
|
|
* better safe than sorry.
|
|
*/
|
|
static inline bool is_zero_ino(ino_t ino)
|
|
{
|
|
return (u32)ino == 0;
|
|
}
|
|
|
|
extern void __iget(struct inode * inode);
|
|
extern void iget_failed(struct inode *);
|
|
extern void clear_inode(struct inode *);
|
|
extern void __destroy_inode(struct inode *);
|
|
extern struct inode *new_inode_pseudo(struct super_block *sb);
|
|
extern struct inode *new_inode(struct super_block *sb);
|
|
extern void free_inode_nonrcu(struct inode *inode);
|
|
extern int setattr_should_drop_suidgid(struct mnt_idmap *, struct inode *);
|
|
extern int file_remove_privs_flags(struct file *file, unsigned int flags);
|
|
extern int file_remove_privs(struct file *);
|
|
int setattr_should_drop_sgid(struct mnt_idmap *idmap,
|
|
const struct inode *inode);
|
|
|
|
/*
|
|
* This must be used for allocating filesystems specific inodes to set
|
|
* up the inode reclaim context correctly.
|
|
*/
|
|
static inline void *
|
|
alloc_inode_sb(struct super_block *sb, struct kmem_cache *cache, gfp_t gfp)
|
|
{
|
|
return kmem_cache_alloc_lru(cache, &sb->s_inode_lru, gfp);
|
|
}
|
|
|
|
extern void __insert_inode_hash(struct inode *, unsigned long hashval);
|
|
static inline void insert_inode_hash(struct inode *inode)
|
|
{
|
|
__insert_inode_hash(inode, inode->i_ino);
|
|
}
|
|
|
|
extern void __remove_inode_hash(struct inode *);
|
|
static inline void remove_inode_hash(struct inode *inode)
|
|
{
|
|
if (!inode_unhashed(inode) && !hlist_fake(&inode->i_hash))
|
|
__remove_inode_hash(inode);
|
|
}
|
|
|
|
extern void inode_sb_list_add(struct inode *inode);
|
|
extern void inode_add_lru(struct inode *inode);
|
|
|
|
extern int sb_set_blocksize(struct super_block *, int);
|
|
extern int sb_min_blocksize(struct super_block *, int);
|
|
|
|
extern int generic_file_mmap(struct file *, struct vm_area_struct *);
|
|
extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);
|
|
extern ssize_t generic_write_checks(struct kiocb *, struct iov_iter *);
|
|
int generic_write_checks_count(struct kiocb *iocb, loff_t *count);
|
|
extern int generic_write_check_limits(struct file *file, loff_t pos,
|
|
loff_t *count);
|
|
extern int generic_file_rw_checks(struct file *file_in, struct file *file_out);
|
|
ssize_t filemap_read(struct kiocb *iocb, struct iov_iter *to,
|
|
ssize_t already_read);
|
|
extern ssize_t generic_file_read_iter(struct kiocb *, struct iov_iter *);
|
|
extern ssize_t __generic_file_write_iter(struct kiocb *, struct iov_iter *);
|
|
extern ssize_t generic_file_write_iter(struct kiocb *, struct iov_iter *);
|
|
extern ssize_t generic_file_direct_write(struct kiocb *, struct iov_iter *);
|
|
ssize_t generic_perform_write(struct kiocb *, struct iov_iter *);
|
|
ssize_t direct_write_fallback(struct kiocb *iocb, struct iov_iter *iter,
|
|
ssize_t direct_written, ssize_t buffered_written);
|
|
|
|
ssize_t vfs_iter_read(struct file *file, struct iov_iter *iter, loff_t *ppos,
|
|
rwf_t flags);
|
|
ssize_t vfs_iter_write(struct file *file, struct iov_iter *iter, loff_t *ppos,
|
|
rwf_t flags);
|
|
ssize_t vfs_iocb_iter_read(struct file *file, struct kiocb *iocb,
|
|
struct iov_iter *iter);
|
|
ssize_t vfs_iocb_iter_write(struct file *file, struct kiocb *iocb,
|
|
struct iov_iter *iter);
|
|
|
|
/* fs/splice.c */
|
|
ssize_t filemap_splice_read(struct file *in, loff_t *ppos,
|
|
struct pipe_inode_info *pipe,
|
|
size_t len, unsigned int flags);
|
|
ssize_t copy_splice_read(struct file *in, loff_t *ppos,
|
|
struct pipe_inode_info *pipe,
|
|
size_t len, unsigned int flags);
|
|
extern ssize_t iter_file_splice_write(struct pipe_inode_info *,
|
|
struct file *, loff_t *, size_t, unsigned int);
|
|
|
|
|
|
extern void
|
|
file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
|
|
extern loff_t noop_llseek(struct file *file, loff_t offset, int whence);
|
|
#define no_llseek NULL
|
|
extern loff_t vfs_setpos(struct file *file, loff_t offset, loff_t maxsize);
|
|
extern loff_t generic_file_llseek(struct file *file, loff_t offset, int whence);
|
|
extern loff_t generic_file_llseek_size(struct file *file, loff_t offset,
|
|
int whence, loff_t maxsize, loff_t eof);
|
|
extern loff_t fixed_size_llseek(struct file *file, loff_t offset,
|
|
int whence, loff_t size);
|
|
extern loff_t no_seek_end_llseek_size(struct file *, loff_t, int, loff_t);
|
|
extern loff_t no_seek_end_llseek(struct file *, loff_t, int);
|
|
int rw_verify_area(int, struct file *, const loff_t *, size_t);
|
|
extern int generic_file_open(struct inode * inode, struct file * filp);
|
|
extern int nonseekable_open(struct inode * inode, struct file * filp);
|
|
extern int stream_open(struct inode * inode, struct file * filp);
|
|
|
|
#ifdef CONFIG_BLOCK
|
|
typedef void (dio_submit_t)(struct bio *bio, struct inode *inode,
|
|
loff_t file_offset);
|
|
|
|
enum {
|
|
/* need locking between buffered and direct access */
|
|
DIO_LOCKING = 0x01,
|
|
|
|
/* filesystem does not support filling holes */
|
|
DIO_SKIP_HOLES = 0x02,
|
|
};
|
|
|
|
ssize_t __blockdev_direct_IO(struct kiocb *iocb, struct inode *inode,
|
|
struct block_device *bdev, struct iov_iter *iter,
|
|
get_block_t get_block,
|
|
dio_iodone_t end_io,
|
|
int flags);
|
|
|
|
static inline ssize_t blockdev_direct_IO(struct kiocb *iocb,
|
|
struct inode *inode,
|
|
struct iov_iter *iter,
|
|
get_block_t get_block)
|
|
{
|
|
return __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev, iter,
|
|
get_block, NULL, DIO_LOCKING | DIO_SKIP_HOLES);
|
|
}
|
|
#endif
|
|
|
|
void inode_dio_wait(struct inode *inode);
|
|
|
|
/**
|
|
* inode_dio_begin - signal start of a direct I/O requests
|
|
* @inode: inode the direct I/O happens on
|
|
*
|
|
* This is called once we've finished processing a direct I/O request,
|
|
* and is used to wake up callers waiting for direct I/O to be quiesced.
|
|
*/
|
|
static inline void inode_dio_begin(struct inode *inode)
|
|
{
|
|
atomic_inc(&inode->i_dio_count);
|
|
}
|
|
|
|
/**
|
|
* inode_dio_end - signal finish of a direct I/O requests
|
|
* @inode: inode the direct I/O happens on
|
|
*
|
|
* This is called once we've finished processing a direct I/O request,
|
|
* and is used to wake up callers waiting for direct I/O to be quiesced.
|
|
*/
|
|
static inline void inode_dio_end(struct inode *inode)
|
|
{
|
|
if (atomic_dec_and_test(&inode->i_dio_count))
|
|
wake_up_bit(&inode->i_state, __I_DIO_WAKEUP);
|
|
}
|
|
|
|
extern void inode_set_flags(struct inode *inode, unsigned int flags,
|
|
unsigned int mask);
|
|
|
|
extern const struct file_operations generic_ro_fops;
|
|
|
|
#define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
|
|
|
|
extern int readlink_copy(char __user *, int, const char *);
|
|
extern int page_readlink(struct dentry *, char __user *, int);
|
|
extern const char *page_get_link(struct dentry *, struct inode *,
|
|
struct delayed_call *);
|
|
extern void page_put_link(void *);
|
|
extern int page_symlink(struct inode *inode, const char *symname, int len);
|
|
extern const struct inode_operations page_symlink_inode_operations;
|
|
extern void kfree_link(void *);
|
|
void generic_fillattr(struct mnt_idmap *, u32, struct inode *, struct kstat *);
|
|
void generic_fill_statx_attr(struct inode *inode, struct kstat *stat);
|
|
extern int vfs_getattr_nosec(const struct path *, struct kstat *, u32, unsigned int);
|
|
extern int vfs_getattr(const struct path *, struct kstat *, u32, unsigned int);
|
|
void __inode_add_bytes(struct inode *inode, loff_t bytes);
|
|
void inode_add_bytes(struct inode *inode, loff_t bytes);
|
|
void __inode_sub_bytes(struct inode *inode, loff_t bytes);
|
|
void inode_sub_bytes(struct inode *inode, loff_t bytes);
|
|
static inline loff_t __inode_get_bytes(struct inode *inode)
|
|
{
|
|
return (((loff_t)inode->i_blocks) << 9) + inode->i_bytes;
|
|
}
|
|
loff_t inode_get_bytes(struct inode *inode);
|
|
void inode_set_bytes(struct inode *inode, loff_t bytes);
|
|
const char *simple_get_link(struct dentry *, struct inode *,
|
|
struct delayed_call *);
|
|
extern const struct inode_operations simple_symlink_inode_operations;
|
|
|
|
extern int iterate_dir(struct file *, struct dir_context *);
|
|
|
|
int vfs_fstatat(int dfd, const char __user *filename, struct kstat *stat,
|
|
int flags);
|
|
int vfs_fstat(int fd, struct kstat *stat);
|
|
|
|
static inline int vfs_stat(const char __user *filename, struct kstat *stat)
|
|
{
|
|
return vfs_fstatat(AT_FDCWD, filename, stat, 0);
|
|
}
|
|
static inline int vfs_lstat(const char __user *name, struct kstat *stat)
|
|
{
|
|
return vfs_fstatat(AT_FDCWD, name, stat, AT_SYMLINK_NOFOLLOW);
|
|
}
|
|
|
|
extern const char *vfs_get_link(struct dentry *, struct delayed_call *);
|
|
extern int vfs_readlink(struct dentry *, char __user *, int);
|
|
|
|
extern struct file_system_type *get_filesystem(struct file_system_type *fs);
|
|
extern void put_filesystem(struct file_system_type *fs);
|
|
extern struct file_system_type *get_fs_type(const char *name);
|
|
extern void drop_super(struct super_block *sb);
|
|
extern void drop_super_exclusive(struct super_block *sb);
|
|
extern void iterate_supers(void (*)(struct super_block *, void *), void *);
|
|
extern void iterate_supers_type(struct file_system_type *,
|
|
void (*)(struct super_block *, void *), void *);
|
|
|
|
extern int dcache_dir_open(struct inode *, struct file *);
|
|
extern int dcache_dir_close(struct inode *, struct file *);
|
|
extern loff_t dcache_dir_lseek(struct file *, loff_t, int);
|
|
extern int dcache_readdir(struct file *, struct dir_context *);
|
|
extern int simple_setattr(struct mnt_idmap *, struct dentry *,
|
|
struct iattr *);
|
|
extern int simple_getattr(struct mnt_idmap *, const struct path *,
|
|
struct kstat *, u32, unsigned int);
|
|
extern int simple_statfs(struct dentry *, struct kstatfs *);
|
|
extern int simple_open(struct inode *inode, struct file *file);
|
|
extern int simple_link(struct dentry *, struct inode *, struct dentry *);
|
|
extern int simple_unlink(struct inode *, struct dentry *);
|
|
extern int simple_rmdir(struct inode *, struct dentry *);
|
|
void simple_rename_timestamp(struct inode *old_dir, struct dentry *old_dentry,
|
|
struct inode *new_dir, struct dentry *new_dentry);
|
|
extern int simple_rename_exchange(struct inode *old_dir, struct dentry *old_dentry,
|
|
struct inode *new_dir, struct dentry *new_dentry);
|
|
extern int simple_rename(struct mnt_idmap *, struct inode *,
|
|
struct dentry *, struct inode *, struct dentry *,
|
|
unsigned int);
|
|
extern void simple_recursive_removal(struct dentry *,
|
|
void (*callback)(struct dentry *));
|
|
extern int noop_fsync(struct file *, loff_t, loff_t, int);
|
|
extern ssize_t noop_direct_IO(struct kiocb *iocb, struct iov_iter *iter);
|
|
extern int simple_empty(struct dentry *);
|
|
extern int simple_write_begin(struct file *file, struct address_space *mapping,
|
|
loff_t pos, unsigned len,
|
|
struct page **pagep, void **fsdata);
|
|
extern const struct address_space_operations ram_aops;
|
|
extern int always_delete_dentry(const struct dentry *);
|
|
extern struct inode *alloc_anon_inode(struct super_block *);
|
|
extern int simple_nosetlease(struct file *, int, struct file_lease **, void **);
|
|
extern const struct dentry_operations simple_dentry_operations;
|
|
|
|
extern struct dentry *simple_lookup(struct inode *, struct dentry *, unsigned int flags);
|
|
extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *);
|
|
extern const struct file_operations simple_dir_operations;
|
|
extern const struct inode_operations simple_dir_inode_operations;
|
|
extern void make_empty_dir_inode(struct inode *inode);
|
|
extern bool is_empty_dir_inode(struct inode *inode);
|
|
struct tree_descr { const char *name; const struct file_operations *ops; int mode; };
|
|
struct dentry *d_alloc_name(struct dentry *, const char *);
|
|
extern int simple_fill_super(struct super_block *, unsigned long,
|
|
const struct tree_descr *);
|
|
extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count);
|
|
extern void simple_release_fs(struct vfsmount **mount, int *count);
|
|
|
|
extern ssize_t simple_read_from_buffer(void __user *to, size_t count,
|
|
loff_t *ppos, const void *from, size_t available);
|
|
extern ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos,
|
|
const void __user *from, size_t count);
|
|
|
|
struct offset_ctx {
|
|
struct maple_tree mt;
|
|
unsigned long next_offset;
|
|
};
|
|
|
|
void simple_offset_init(struct offset_ctx *octx);
|
|
int simple_offset_add(struct offset_ctx *octx, struct dentry *dentry);
|
|
void simple_offset_remove(struct offset_ctx *octx, struct dentry *dentry);
|
|
int simple_offset_empty(struct dentry *dentry);
|
|
int simple_offset_rename_exchange(struct inode *old_dir,
|
|
struct dentry *old_dentry,
|
|
struct inode *new_dir,
|
|
struct dentry *new_dentry);
|
|
void simple_offset_destroy(struct offset_ctx *octx);
|
|
|
|
extern const struct file_operations simple_offset_dir_operations;
|
|
|
|
extern int __generic_file_fsync(struct file *, loff_t, loff_t, int);
|
|
extern int generic_file_fsync(struct file *, loff_t, loff_t, int);
|
|
|
|
extern int generic_check_addressable(unsigned, u64);
|
|
|
|
extern void generic_set_sb_d_ops(struct super_block *sb);
|
|
|
|
static inline bool sb_has_encoding(const struct super_block *sb)
|
|
{
|
|
#if IS_ENABLED(CONFIG_UNICODE)
|
|
return !!sb->s_encoding;
|
|
#else
|
|
return false;
|
|
#endif
|
|
}
|
|
|
|
int may_setattr(struct mnt_idmap *idmap, struct inode *inode,
|
|
unsigned int ia_valid);
|
|
int setattr_prepare(struct mnt_idmap *, struct dentry *, struct iattr *);
|
|
extern int inode_newsize_ok(const struct inode *, loff_t offset);
|
|
void setattr_copy(struct mnt_idmap *, struct inode *inode,
|
|
const struct iattr *attr);
|
|
|
|
extern int file_update_time(struct file *file);
|
|
|
|
static inline bool vma_is_dax(const struct vm_area_struct *vma)
|
|
{
|
|
return vma->vm_file && IS_DAX(vma->vm_file->f_mapping->host);
|
|
}
|
|
|
|
static inline bool vma_is_fsdax(struct vm_area_struct *vma)
|
|
{
|
|
struct inode *inode;
|
|
|
|
if (!IS_ENABLED(CONFIG_FS_DAX) || !vma->vm_file)
|
|
return false;
|
|
if (!vma_is_dax(vma))
|
|
return false;
|
|
inode = file_inode(vma->vm_file);
|
|
if (S_ISCHR(inode->i_mode))
|
|
return false; /* device-dax */
|
|
return true;
|
|
}
|
|
|
|
static inline int iocb_flags(struct file *file)
|
|
{
|
|
int res = 0;
|
|
if (file->f_flags & O_APPEND)
|
|
res |= IOCB_APPEND;
|
|
if (file->f_flags & O_DIRECT)
|
|
res |= IOCB_DIRECT;
|
|
if (file->f_flags & O_DSYNC)
|
|
res |= IOCB_DSYNC;
|
|
if (file->f_flags & __O_SYNC)
|
|
res |= IOCB_SYNC;
|
|
return res;
|
|
}
|
|
|
|
static inline int kiocb_set_rw_flags(struct kiocb *ki, rwf_t flags)
|
|
{
|
|
int kiocb_flags = 0;
|
|
|
|
/* make sure there's no overlap between RWF and private IOCB flags */
|
|
BUILD_BUG_ON((__force int) RWF_SUPPORTED & IOCB_EVENTFD);
|
|
|
|
if (!flags)
|
|
return 0;
|
|
if (unlikely(flags & ~RWF_SUPPORTED))
|
|
return -EOPNOTSUPP;
|
|
if (unlikely((flags & RWF_APPEND) && (flags & RWF_NOAPPEND)))
|
|
return -EINVAL;
|
|
|
|
if (flags & RWF_NOWAIT) {
|
|
if (!(ki->ki_filp->f_mode & FMODE_NOWAIT))
|
|
return -EOPNOTSUPP;
|
|
kiocb_flags |= IOCB_NOIO;
|
|
}
|
|
kiocb_flags |= (__force int) (flags & RWF_SUPPORTED);
|
|
if (flags & RWF_SYNC)
|
|
kiocb_flags |= IOCB_DSYNC;
|
|
|
|
if ((flags & RWF_NOAPPEND) && (ki->ki_flags & IOCB_APPEND)) {
|
|
if (IS_APPEND(file_inode(ki->ki_filp)))
|
|
return -EPERM;
|
|
ki->ki_flags &= ~IOCB_APPEND;
|
|
}
|
|
|
|
ki->ki_flags |= kiocb_flags;
|
|
return 0;
|
|
}
|
|
|
|
static inline ino_t parent_ino(struct dentry *dentry)
|
|
{
|
|
ino_t res;
|
|
|
|
/*
|
|
* Don't strictly need d_lock here? If the parent ino could change
|
|
* then surely we'd have a deeper race in the caller?
|
|
*/
|
|
spin_lock(&dentry->d_lock);
|
|
res = dentry->d_parent->d_inode->i_ino;
|
|
spin_unlock(&dentry->d_lock);
|
|
return res;
|
|
}
|
|
|
|
/* Transaction based IO helpers */
|
|
|
|
/*
|
|
* An argresp is stored in an allocated page and holds the
|
|
* size of the argument or response, along with its content
|
|
*/
|
|
struct simple_transaction_argresp {
|
|
ssize_t size;
|
|
char data[];
|
|
};
|
|
|
|
#define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
|
|
|
|
char *simple_transaction_get(struct file *file, const char __user *buf,
|
|
size_t size);
|
|
ssize_t simple_transaction_read(struct file *file, char __user *buf,
|
|
size_t size, loff_t *pos);
|
|
int simple_transaction_release(struct inode *inode, struct file *file);
|
|
|
|
void simple_transaction_set(struct file *file, size_t n);
|
|
|
|
/*
|
|
* simple attribute files
|
|
*
|
|
* These attributes behave similar to those in sysfs:
|
|
*
|
|
* Writing to an attribute immediately sets a value, an open file can be
|
|
* written to multiple times.
|
|
*
|
|
* Reading from an attribute creates a buffer from the value that might get
|
|
* read with multiple read calls. When the attribute has been read
|
|
* completely, no further read calls are possible until the file is opened
|
|
* again.
|
|
*
|
|
* All attributes contain a text representation of a numeric value
|
|
* that are accessed with the get() and set() functions.
|
|
*/
|
|
#define DEFINE_SIMPLE_ATTRIBUTE_XSIGNED(__fops, __get, __set, __fmt, __is_signed) \
|
|
static int __fops ## _open(struct inode *inode, struct file *file) \
|
|
{ \
|
|
__simple_attr_check_format(__fmt, 0ull); \
|
|
return simple_attr_open(inode, file, __get, __set, __fmt); \
|
|
} \
|
|
static const struct file_operations __fops = { \
|
|
.owner = THIS_MODULE, \
|
|
.open = __fops ## _open, \
|
|
.release = simple_attr_release, \
|
|
.read = simple_attr_read, \
|
|
.write = (__is_signed) ? simple_attr_write_signed : simple_attr_write, \
|
|
.llseek = generic_file_llseek, \
|
|
}
|
|
|
|
#define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
|
|
DEFINE_SIMPLE_ATTRIBUTE_XSIGNED(__fops, __get, __set, __fmt, false)
|
|
|
|
#define DEFINE_SIMPLE_ATTRIBUTE_SIGNED(__fops, __get, __set, __fmt) \
|
|
DEFINE_SIMPLE_ATTRIBUTE_XSIGNED(__fops, __get, __set, __fmt, true)
|
|
|
|
static inline __printf(1, 2)
|
|
void __simple_attr_check_format(const char *fmt, ...)
|
|
{
|
|
/* don't do anything, just let the compiler check the arguments; */
|
|
}
|
|
|
|
int simple_attr_open(struct inode *inode, struct file *file,
|
|
int (*get)(void *, u64 *), int (*set)(void *, u64),
|
|
const char *fmt);
|
|
int simple_attr_release(struct inode *inode, struct file *file);
|
|
ssize_t simple_attr_read(struct file *file, char __user *buf,
|
|
size_t len, loff_t *ppos);
|
|
ssize_t simple_attr_write(struct file *file, const char __user *buf,
|
|
size_t len, loff_t *ppos);
|
|
ssize_t simple_attr_write_signed(struct file *file, const char __user *buf,
|
|
size_t len, loff_t *ppos);
|
|
|
|
struct ctl_table;
|
|
int __init list_bdev_fs_names(char *buf, size_t size);
|
|
|
|
#define __FMODE_EXEC ((__force int) FMODE_EXEC)
|
|
#define __FMODE_NONOTIFY ((__force int) FMODE_NONOTIFY)
|
|
|
|
#define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE])
|
|
#define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \
|
|
(flag & __FMODE_NONOTIFY)))
|
|
|
|
static inline bool is_sxid(umode_t mode)
|
|
{
|
|
return mode & (S_ISUID | S_ISGID);
|
|
}
|
|
|
|
static inline int check_sticky(struct mnt_idmap *idmap,
|
|
struct inode *dir, struct inode *inode)
|
|
{
|
|
if (!(dir->i_mode & S_ISVTX))
|
|
return 0;
|
|
|
|
return __check_sticky(idmap, dir, inode);
|
|
}
|
|
|
|
static inline void inode_has_no_xattr(struct inode *inode)
|
|
{
|
|
if (!is_sxid(inode->i_mode) && (inode->i_sb->s_flags & SB_NOSEC))
|
|
inode->i_flags |= S_NOSEC;
|
|
}
|
|
|
|
static inline bool is_root_inode(struct inode *inode)
|
|
{
|
|
return inode == inode->i_sb->s_root->d_inode;
|
|
}
|
|
|
|
static inline bool dir_emit(struct dir_context *ctx,
|
|
const char *name, int namelen,
|
|
u64 ino, unsigned type)
|
|
{
|
|
return ctx->actor(ctx, name, namelen, ctx->pos, ino, type);
|
|
}
|
|
static inline bool dir_emit_dot(struct file *file, struct dir_context *ctx)
|
|
{
|
|
return ctx->actor(ctx, ".", 1, ctx->pos,
|
|
file->f_path.dentry->d_inode->i_ino, DT_DIR);
|
|
}
|
|
static inline bool dir_emit_dotdot(struct file *file, struct dir_context *ctx)
|
|
{
|
|
return ctx->actor(ctx, "..", 2, ctx->pos,
|
|
parent_ino(file->f_path.dentry), DT_DIR);
|
|
}
|
|
static inline bool dir_emit_dots(struct file *file, struct dir_context *ctx)
|
|
{
|
|
if (ctx->pos == 0) {
|
|
if (!dir_emit_dot(file, ctx))
|
|
return false;
|
|
ctx->pos = 1;
|
|
}
|
|
if (ctx->pos == 1) {
|
|
if (!dir_emit_dotdot(file, ctx))
|
|
return false;
|
|
ctx->pos = 2;
|
|
}
|
|
return true;
|
|
}
|
|
static inline bool dir_relax(struct inode *inode)
|
|
{
|
|
inode_unlock(inode);
|
|
inode_lock(inode);
|
|
return !IS_DEADDIR(inode);
|
|
}
|
|
|
|
static inline bool dir_relax_shared(struct inode *inode)
|
|
{
|
|
inode_unlock_shared(inode);
|
|
inode_lock_shared(inode);
|
|
return !IS_DEADDIR(inode);
|
|
}
|
|
|
|
extern bool path_noexec(const struct path *path);
|
|
extern void inode_nohighmem(struct inode *inode);
|
|
|
|
/* mm/fadvise.c */
|
|
extern int vfs_fadvise(struct file *file, loff_t offset, loff_t len,
|
|
int advice);
|
|
extern int generic_fadvise(struct file *file, loff_t offset, loff_t len,
|
|
int advice);
|
|
|
|
#endif /* _LINUX_FS_H */
|