From: Filipe Manana
The log tree has a long standing problem that when a file is fsync'ed we
only check for new ancestors, created in the current transaction, by
following only the hard link for which the fsync was issued. We follow the
ancestors using the VFS' dget_parent() API. This means that if we create a
new link for a file in a directory that is new (or in an any other new
ancestor directory) and then fsync the file using an old hard link, we end
up not logging the new ancestor, and on log replay that new hard link and
ancestor do not exist. In some cases, involving renames, the file will not
exist at all.
Example:
mkfs.btrfs -f /dev/sdb
mount /dev/sdb /mnt
mkdir /mnt/A
touch /mnt/foo
ln /mnt/foo /mnt/A/bar
xfs_io -c fsync /mnt/foo
In this example after log replay only the hard link named 'foo' exists
and directory A does not exist, which is unexpected. In other major linux
filesystems, such as ext4, xfs and f2fs for example, both hard links exist
and so does directory A after mounting again the filesystem.
Checking if any new ancestors are new and need to be logged was added in
2009 by commit 12fcfd22fe5b ("Btrfs: tree logging unlink/rename fixes"),
however only for the ancestors of the hard link (dentry) for which the
fsync was issued, instead of checking for all ancestors for all of the
inode's hard links.
So fix this by tracking the id of the last transaction where a hard link
was created for an inode and then on fsync fallback to a full transaction
commit when an inode has more than one hard link and at least one new hard
link was created in the current transaction. This is the simplest solution
since this is not a common use case (adding frequently hard links for
which there's an ancestor created in the current transaction and then
fsync the file). In case it ever becomes a common use case, a solution
that consists of iterating the fs/subvol btree for each hard link and
check if any ancestor is new, could be implemented.
This solves many unexpected scenarios reported by Jayashree Mohan and
Vijay Chidambaram, and for which there is a new test case for fstests
under review.
Reported-by: Vijay Chidambaram
Reported-by: Jayashree Mohan
Fixes: 12fcfd22fe5b ("Btrfs: tree logging unlink/rename fixes")
Signed-off-by: Filipe Manana
---
V2: Added missing case set last_link_trans after an inode is evicted and
loaded again.
fs/btrfs/btrfs_inode.h | 6 ++
fs/btrfs/inode.c | 17 +
fs/btrfs/tree-log.c| 16
3 files changed, 39 insertions(+)
diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h
index 1343ac57b438..7177d1d33584 100644
--- a/fs/btrfs/btrfs_inode.h
+++ b/fs/btrfs/btrfs_inode.h
@@ -147,6 +147,12 @@ struct btrfs_inode {
u64 last_unlink_trans;
/*
+* Track the transaction id of the last transaction used to create a
+* hard link for the inode. This is used by the log tree (fsync).
+*/
+ u64 last_link_trans;
+
+ /*
* Number of bytes outstanding that are going to need csums. This is
* used in ENOSPC accounting.
*/
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 64ea749c1ba4..51f4628be2d2 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -3685,6 +3685,21 @@ static int btrfs_read_locked_inode(struct inode *inode,
* inode is not a directory, logging its parent unnecessarily.
*/
BTRFS_I(inode)->last_unlink_trans = BTRFS_I(inode)->last_trans;
+ /*
+* Similar reasoning for last_link_trans, needs to be set otherwise
+* for a case like the following:
+*
+* mkdir A
+* touch foo
+* ln foo A/bar
+* echo 2 > /proc/sys/vm/drop_caches
+* fsync foo
+*
+*
+* Would result in link bar and directory A not existing after the power
+* failure.
+*/
+ BTRFS_I(inode)->last_link_trans = BTRFS_I(inode)->last_trans;
path->slots[0]++;
if (inode->i_nlink != 1 ||
@@ -6651,6 +,7 @@ static int btrfs_link(struct dentry *old_dentry, struct
inode *dir,
if (err)
goto fail;
}
+ BTRFS_I(inode)->last_link_trans = trans->transid;
d_instantiate(dentry, inode);
ret = btrfs_log_new_name(trans, BTRFS_I(inode), NULL, parent,
true, NULL);
@@ -9179,6 +9195,7 @@ struct inode *btrfs_alloc_inode(struct super_block *sb)
ei->index_cnt = (u64)-1;
ei->dir_index = 0;
ei->last_unlink_trans = 0;
+ ei->last_link_trans = 0;
ei->last_log_commit = 0;
spin_lock_init(>lock);
diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index aac3749f697f..896d79144052 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -5760,6 +5760,22 @@ static int btrfs_log_inode_parent(struct
btrfs_trans_handle *trans,
