6628465e33
Modify xtSearch so that it returns the next allocated block when the requested block is unmapped. This can be used to make sure we don't create a new extent that overlaps the next one. Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
374 lines
9.1 KiB
C
374 lines
9.1 KiB
C
/*
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* Copyright (C) International Business Machines Corp., 2000-2004
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* Portions Copyright (C) Christoph Hellwig, 2001-2002
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/fs.h>
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#include <linux/mpage.h>
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#include <linux/buffer_head.h>
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#include <linux/pagemap.h>
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#include <linux/quotaops.h>
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#include "jfs_incore.h"
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#include "jfs_filsys.h"
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#include "jfs_imap.h"
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#include "jfs_extent.h"
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#include "jfs_unicode.h"
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#include "jfs_debug.h"
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extern struct inode_operations jfs_dir_inode_operations;
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extern struct inode_operations jfs_file_inode_operations;
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extern struct inode_operations jfs_symlink_inode_operations;
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extern struct file_operations jfs_dir_operations;
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extern struct file_operations jfs_file_operations;
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struct address_space_operations jfs_aops;
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extern int freeZeroLink(struct inode *);
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void jfs_read_inode(struct inode *inode)
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{
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if (diRead(inode)) {
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make_bad_inode(inode);
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return;
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}
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if (S_ISREG(inode->i_mode)) {
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inode->i_op = &jfs_file_inode_operations;
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inode->i_fop = &jfs_file_operations;
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inode->i_mapping->a_ops = &jfs_aops;
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} else if (S_ISDIR(inode->i_mode)) {
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inode->i_op = &jfs_dir_inode_operations;
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inode->i_fop = &jfs_dir_operations;
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} else if (S_ISLNK(inode->i_mode)) {
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if (inode->i_size >= IDATASIZE) {
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inode->i_op = &page_symlink_inode_operations;
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inode->i_mapping->a_ops = &jfs_aops;
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} else
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inode->i_op = &jfs_symlink_inode_operations;
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} else {
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inode->i_op = &jfs_file_inode_operations;
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init_special_inode(inode, inode->i_mode, inode->i_rdev);
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}
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}
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/*
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* Workhorse of both fsync & write_inode
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*/
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int jfs_commit_inode(struct inode *inode, int wait)
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{
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int rc = 0;
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tid_t tid;
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static int noisy = 5;
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jfs_info("In jfs_commit_inode, inode = 0x%p", inode);
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/*
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* Don't commit if inode has been committed since last being
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* marked dirty, or if it has been deleted.
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*/
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if (inode->i_nlink == 0 || !test_cflag(COMMIT_Dirty, inode))
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return 0;
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if (isReadOnly(inode)) {
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/* kernel allows writes to devices on read-only
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* partitions and may think inode is dirty
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*/
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if (!special_file(inode->i_mode) && noisy) {
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jfs_err("jfs_commit_inode(0x%p) called on "
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"read-only volume", inode);
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jfs_err("Is remount racy?");
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noisy--;
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}
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return 0;
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}
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tid = txBegin(inode->i_sb, COMMIT_INODE);
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down(&JFS_IP(inode)->commit_sem);
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/*
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* Retest inode state after taking commit_sem
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*/
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if (inode->i_nlink && test_cflag(COMMIT_Dirty, inode))
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rc = txCommit(tid, 1, &inode, wait ? COMMIT_SYNC : 0);
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txEnd(tid);
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up(&JFS_IP(inode)->commit_sem);
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return rc;
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}
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int jfs_write_inode(struct inode *inode, int wait)
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{
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if (test_cflag(COMMIT_Nolink, inode))
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return 0;
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/*
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* If COMMIT_DIRTY is not set, the inode isn't really dirty.
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* It has been committed since the last change, but was still
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* on the dirty inode list.
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*/
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if (!test_cflag(COMMIT_Dirty, inode)) {
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/* Make sure committed changes hit the disk */
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jfs_flush_journal(JFS_SBI(inode->i_sb)->log, wait);
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return 0;
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}
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if (jfs_commit_inode(inode, wait)) {
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jfs_err("jfs_write_inode: jfs_commit_inode failed!");
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return -EIO;
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} else
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return 0;
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}
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void jfs_delete_inode(struct inode *inode)
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{
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jfs_info("In jfs_delete_inode, inode = 0x%p", inode);
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if (test_cflag(COMMIT_Freewmap, inode))
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freeZeroLink(inode);
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diFree(inode);
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/*
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* Free the inode from the quota allocation.
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*/
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DQUOT_INIT(inode);
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DQUOT_FREE_INODE(inode);
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DQUOT_DROP(inode);
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clear_inode(inode);
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}
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void jfs_dirty_inode(struct inode *inode)
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{
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static int noisy = 5;
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if (isReadOnly(inode)) {
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if (!special_file(inode->i_mode) && noisy) {
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/* kernel allows writes to devices on read-only
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* partitions and may try to mark inode dirty
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*/
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jfs_err("jfs_dirty_inode called on read-only volume");
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jfs_err("Is remount racy?");
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noisy--;
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}
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return;
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}
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set_cflag(COMMIT_Dirty, inode);
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}
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static int
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jfs_get_blocks(struct inode *ip, sector_t lblock, unsigned long max_blocks,
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struct buffer_head *bh_result, int create)
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{
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s64 lblock64 = lblock;
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int rc = 0;
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xad_t xad;
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s64 xaddr;
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int xflag;
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s32 xlen = max_blocks;
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/*
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* Take appropriate lock on inode
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*/
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if (create)
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IWRITE_LOCK(ip);
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else
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IREAD_LOCK(ip);
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if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) &&
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(!xtLookup(ip, lblock64, max_blocks, &xflag, &xaddr, &xlen, 0)) &&
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xaddr) {
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if (xflag & XAD_NOTRECORDED) {
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if (!create)
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/*
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* Allocated but not recorded, read treats
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* this as a hole
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*/
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goto unlock;
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#ifdef _JFS_4K
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XADoffset(&xad, lblock64);
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XADlength(&xad, xlen);
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XADaddress(&xad, xaddr);
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#else /* _JFS_4K */
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/*
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* As long as block size = 4K, this isn't a problem.
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* We should mark the whole page not ABNR, but how
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* will we know to mark the other blocks BH_New?
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*/
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BUG();
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#endif /* _JFS_4K */
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rc = extRecord(ip, &xad);
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if (rc)
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goto unlock;
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set_buffer_new(bh_result);
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}
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map_bh(bh_result, ip->i_sb, xaddr);
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bh_result->b_size = xlen << ip->i_blkbits;
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goto unlock;
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}
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if (!create)
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goto unlock;
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/*
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* Allocate a new block
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*/
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#ifdef _JFS_4K
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if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad)))
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goto unlock;
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rc = extAlloc(ip, xlen, lblock64, &xad, FALSE);
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if (rc)
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goto unlock;
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set_buffer_new(bh_result);
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map_bh(bh_result, ip->i_sb, addressXAD(&xad));
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bh_result->b_size = lengthXAD(&xad) << ip->i_blkbits;
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#else /* _JFS_4K */
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/*
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* We need to do whatever it takes to keep all but the last buffers
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* in 4K pages - see jfs_write.c
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*/
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BUG();
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#endif /* _JFS_4K */
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unlock:
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/*
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* Release lock on inode
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*/
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if (create)
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IWRITE_UNLOCK(ip);
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else
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IREAD_UNLOCK(ip);
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return rc;
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}
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static int jfs_get_block(struct inode *ip, sector_t lblock,
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struct buffer_head *bh_result, int create)
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{
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return jfs_get_blocks(ip, lblock, 1, bh_result, create);
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}
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static int jfs_writepage(struct page *page, struct writeback_control *wbc)
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{
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return nobh_writepage(page, jfs_get_block, wbc);
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}
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static int jfs_writepages(struct address_space *mapping,
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struct writeback_control *wbc)
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{
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return mpage_writepages(mapping, wbc, jfs_get_block);
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}
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static int jfs_readpage(struct file *file, struct page *page)
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{
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return mpage_readpage(page, jfs_get_block);
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}
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static int jfs_readpages(struct file *file, struct address_space *mapping,
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struct list_head *pages, unsigned nr_pages)
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{
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return mpage_readpages(mapping, pages, nr_pages, jfs_get_block);
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}
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static int jfs_prepare_write(struct file *file,
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struct page *page, unsigned from, unsigned to)
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{
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return nobh_prepare_write(page, from, to, jfs_get_block);
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}
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static sector_t jfs_bmap(struct address_space *mapping, sector_t block)
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{
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return generic_block_bmap(mapping, block, jfs_get_block);
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}
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static ssize_t jfs_direct_IO(int rw, struct kiocb *iocb,
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const struct iovec *iov, loff_t offset, unsigned long nr_segs)
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{
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struct file *file = iocb->ki_filp;
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struct inode *inode = file->f_mapping->host;
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return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
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offset, nr_segs, jfs_get_blocks, NULL);
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}
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struct address_space_operations jfs_aops = {
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.readpage = jfs_readpage,
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.readpages = jfs_readpages,
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.writepage = jfs_writepage,
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.writepages = jfs_writepages,
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.sync_page = block_sync_page,
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.prepare_write = jfs_prepare_write,
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.commit_write = nobh_commit_write,
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.bmap = jfs_bmap,
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.direct_IO = jfs_direct_IO,
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};
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/*
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* Guts of jfs_truncate. Called with locks already held. Can be called
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* with directory for truncating directory index table.
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*/
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void jfs_truncate_nolock(struct inode *ip, loff_t length)
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{
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loff_t newsize;
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tid_t tid;
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ASSERT(length >= 0);
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if (test_cflag(COMMIT_Nolink, ip)) {
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xtTruncate(0, ip, length, COMMIT_WMAP);
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return;
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}
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do {
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tid = txBegin(ip->i_sb, 0);
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/*
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* The commit_sem cannot be taken before txBegin.
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* txBegin may block and there is a chance the inode
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* could be marked dirty and need to be committed
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* before txBegin unblocks
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*/
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down(&JFS_IP(ip)->commit_sem);
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newsize = xtTruncate(tid, ip, length,
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COMMIT_TRUNCATE | COMMIT_PWMAP);
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if (newsize < 0) {
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txEnd(tid);
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up(&JFS_IP(ip)->commit_sem);
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break;
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}
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ip->i_mtime = ip->i_ctime = CURRENT_TIME;
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mark_inode_dirty(ip);
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txCommit(tid, 1, &ip, 0);
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txEnd(tid);
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up(&JFS_IP(ip)->commit_sem);
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} while (newsize > length); /* Truncate isn't always atomic */
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}
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void jfs_truncate(struct inode *ip)
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{
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jfs_info("jfs_truncate: size = 0x%lx", (ulong) ip->i_size);
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nobh_truncate_page(ip->i_mapping, ip->i_size);
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IWRITE_LOCK(ip);
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jfs_truncate_nolock(ip, ip->i_size);
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IWRITE_UNLOCK(ip);
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}
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