Btrfs: do not collect ordered extents when logging that inode exists
When logging that an inode exists, for example as part of a directory fsync operation, we were collecting any ordered extents for the inode but we ended up doing nothing with them except tagging them as processed, by setting the flag BTRFS_ORDERED_LOGGED on them, which prevented a subsequent fsync of that inode (using the LOG_INODE_ALL mode) from collecting and processing them. This created a time window where a second fsync against the inode, using the fast path, ended up not logging the checksums for the new extents but it logged the extents since they were part of the list of modified extents. This happened because the ordered extents were not collected and checksums were not yet added to the csum tree - the ordered extents have not gone through btrfs_finish_ordered_io() yet (which is where we add them to the csum tree by calling inode.c:add_pending_csums()). So fix this by not collecting an inode's ordered extents if we are logging it with the LOG_INODE_EXISTS mode. Signed-off-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
parent
affc0ff902
commit
5e33a2bd7c
|
@ -4500,6 +4500,21 @@ static int btrfs_log_inode(struct btrfs_trans_handle *trans,
|
|||
|
||||
mutex_lock(&BTRFS_I(inode)->log_mutex);
|
||||
|
||||
/*
|
||||
* Collect ordered extents only if we are logging data. This is to
|
||||
* ensure a subsequent request to log this inode in LOG_INODE_ALL mode
|
||||
* will process the ordered extents if they still exists at the time,
|
||||
* because when we collect them we test and set for the flag
|
||||
* BTRFS_ORDERED_LOGGED to prevent multiple log requests to process the
|
||||
* same ordered extents. The consequence for the LOG_INODE_ALL log mode
|
||||
* not processing the ordered extents is that we end up logging the
|
||||
* corresponding file extent items, based on the extent maps in the
|
||||
* inode's extent_map_tree's modified_list, without logging the
|
||||
* respective checksums (since the may still be only attached to the
|
||||
* ordered extents and have not been inserted in the csum tree by
|
||||
* btrfs_finish_ordered_io() yet).
|
||||
*/
|
||||
if (inode_only == LOG_INODE_ALL)
|
||||
btrfs_get_logged_extents(inode, &logged_list, start, end);
|
||||
|
||||
/*
|
||||
|
|
Loading…
Reference in a new issue