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[PATCH] reiserfs: do not add save links for O_DIRECT writes 

We add a save link for O_DIRECT writes to protect the i_size against the
crashes before we actually finish the I/O.  If we hit an -ENOSPC in
aops->prepare_write(), we would do a truncate() to release the blocks which
might have got initialized.  Now the truncate would add another save link
for the same inode causing a reiserfs panic for having multiple save links
for the same inode.

Signed-off-by: Vladimir V. Saveliev <vs@namesys.com>
Signed-off-by: Amit Arora <amitarora@in.ibm.com>
Signed-off-by: Suzuki K P <suzuki@in.ibm.com>
Cc: Jeff Mahoney <jeffm@suse.com>
Cc: Chris Mason <mason@suse.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Vladimir V. Saveliev 2006-12-06 20:39:12 -08:00 committed by Linus Torvalds
parent 301827acbe
commit c55747682e
1 changed files with 4 additions and 50 deletions
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54
fs/reiserfs/file.c
View File

@ -406,6 +406,8 @@ static int reiserfs_allocate_blocks_for_region(struct reiserfs_transaction_handl
we restart it. This will also free the path. */
if (journal_transaction_should_end
(th, th->t_blocks_allocated)) {
inode->i_size = cpu_key_k_offset(&key) +
(to_paste << inode->i_blkbits);
res =
restart_transaction(th, inode,
&path);
@ -1310,56 +1312,8 @@ static ssize_t reiserfs_file_write(struct file *file, /* the file we are going t
count = MAX_NON_LFS - (unsigned long)*ppos;
}
if (file->f_flags & O_DIRECT) { // Direct IO needs treatment
ssize_t result, after_file_end = 0;
if ((*ppos + count >= inode->i_size)
|| (file->f_flags & O_APPEND)) {
/* If we are appending a file, we need to put this savelink in here.
If we will crash while doing direct io, finish_unfinished will
cut the garbage from the file end. */
reiserfs_write_lock(inode->i_sb);
err =
journal_begin(&th, inode->i_sb,
JOURNAL_PER_BALANCE_CNT);
if (err) {
reiserfs_write_unlock(inode->i_sb);
return err;
}
reiserfs_update_inode_transaction(inode);
add_save_link(&th, inode, 1 /* Truncate */ );
after_file_end = 1;
err =
journal_end(&th, inode->i_sb,
JOURNAL_PER_BALANCE_CNT);
reiserfs_write_unlock(inode->i_sb);
if (err)
return err;
}
result = do_sync_write(file, buf, count, ppos);
if (after_file_end) { /* Now update i_size and remove the savelink */
struct reiserfs_transaction_handle th;
reiserfs_write_lock(inode->i_sb);
err = journal_begin(&th, inode->i_sb, 1);
if (err) {
reiserfs_write_unlock(inode->i_sb);
return err;
}
reiserfs_update_inode_transaction(inode);
mark_inode_dirty(inode);
err = journal_end(&th, inode->i_sb, 1);
if (err) {
reiserfs_write_unlock(inode->i_sb);
return err;
}
err = remove_save_link(inode, 1 /* truncate */ );
reiserfs_write_unlock(inode->i_sb);
if (err)
return err;
}
return result;
}
if (file->f_flags & O_DIRECT)
return do_sync_write(file, buf, count, ppos);
if (unlikely((ssize_t) count < 0))
return -EINVAL;