ef7f38359e
This patch adds nanosecond timestamps for ext4. This involves adding *time_extra fields to the ext4_inode to extend the timestamps to 64-bits. Creation time is also added by this patch. These extended fields will fit into an inode if the filesystem was formatted with large inodes (-I 256 or larger) and there are currently no EAs consuming all of the available space. For new inodes we always reserve enough space for the kernel's known extended fields, but for inodes created with an old kernel this might not have been the case. So this patch also adds the EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE feature flag(ro-compat so that older kernels can't create inodes with a smaller extra_isize). which indicates if the fields fitting inside s_min_extra_isize are available or not. If the expansion of inodes if unsuccessful then this feature will be disabled. This feature is only enabled if requested by the sysadmin. None of the extended inode fields is critical for correct filesystem operation. Signed-off-by: Andreas Dilger <adilger@clusterfs.com> Signed-off-by: Kalpak Shah <kalpak@clusterfs.com> Signed-off-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com> Signed-off-by: Mingming Cao <cmm@us.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
98 lines
3.1 KiB
C
98 lines
3.1 KiB
C
/*
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* linux/include/linux/ext4_fs_sb.h
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*
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* Copyright (C) 1992, 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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*
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* from
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*
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* linux/include/linux/minix_fs_sb.h
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*/
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#ifndef _LINUX_EXT4_FS_SB
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#define _LINUX_EXT4_FS_SB
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#ifdef __KERNEL__
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#include <linux/timer.h>
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#include <linux/wait.h>
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#include <linux/blockgroup_lock.h>
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#include <linux/percpu_counter.h>
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#endif
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#include <linux/rbtree.h>
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/*
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* third extended-fs super-block data in memory
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*/
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struct ext4_sb_info {
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unsigned long s_frag_size; /* Size of a fragment in bytes */
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unsigned long s_desc_size; /* Size of a group descriptor in bytes */
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unsigned long s_frags_per_block;/* Number of fragments per block */
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unsigned long s_inodes_per_block;/* Number of inodes per block */
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unsigned long s_frags_per_group;/* Number of fragments in a group */
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unsigned long s_blocks_per_group;/* Number of blocks in a group */
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unsigned long s_inodes_per_group;/* Number of inodes in a group */
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unsigned long s_itb_per_group; /* Number of inode table blocks per group */
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unsigned long s_gdb_count; /* Number of group descriptor blocks */
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unsigned long s_desc_per_block; /* Number of group descriptors per block */
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unsigned long s_groups_count; /* Number of groups in the fs */
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unsigned long s_overhead_last; /* Last calculated overhead */
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unsigned long s_blocks_last; /* Last seen block count */
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struct buffer_head * s_sbh; /* Buffer containing the super block */
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struct ext4_super_block * s_es; /* Pointer to the super block in the buffer */
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struct buffer_head ** s_group_desc;
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unsigned long s_mount_opt;
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uid_t s_resuid;
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gid_t s_resgid;
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unsigned short s_mount_state;
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unsigned short s_pad;
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int s_addr_per_block_bits;
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int s_desc_per_block_bits;
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int s_inode_size;
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int s_first_ino;
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spinlock_t s_next_gen_lock;
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u32 s_next_generation;
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u32 s_hash_seed[4];
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int s_def_hash_version;
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struct percpu_counter s_freeblocks_counter;
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struct percpu_counter s_freeinodes_counter;
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struct percpu_counter s_dirs_counter;
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struct blockgroup_lock s_blockgroup_lock;
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/* root of the per fs reservation window tree */
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spinlock_t s_rsv_window_lock;
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struct rb_root s_rsv_window_root;
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struct ext4_reserve_window_node s_rsv_window_head;
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/* Journaling */
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struct inode * s_journal_inode;
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struct journal_s * s_journal;
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struct list_head s_orphan;
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unsigned long s_commit_interval;
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struct block_device *journal_bdev;
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#ifdef CONFIG_JBD2_DEBUG
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struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */
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wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */
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#endif
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#ifdef CONFIG_QUOTA
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char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
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int s_jquota_fmt; /* Format of quota to use */
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#endif
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unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
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#ifdef EXTENTS_STATS
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/* ext4 extents stats */
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unsigned long s_ext_min;
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unsigned long s_ext_max;
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unsigned long s_depth_max;
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spinlock_t s_ext_stats_lock;
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unsigned long s_ext_blocks;
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unsigned long s_ext_extents;
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#endif
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};
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#endif /* _LINUX_EXT4_FS_SB */
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