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Btrfs: fix unexpected -EEXIST when creating new inode 

The highest objectid, which is assigned to new inode, is decided at
the time of initializing fs roots.  However, in cases where log replay
gets processed, the btree which fs root owns might be changed, so we
have to search it again for the highest objectid, otherwise creating
new inode would end up with -EEXIST.

cc: <stable@vger.kernel.org> v4.4-rc6+
Fixes: f32e48e925 ("Btrfs: Initialize btrfs_root->highest_objectid when loading tree root and subvolume roots")
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Liu Bo 2018-01-25 11:02:56 -07:00 committed by David Sterba
parent 1a932ef4e4
commit 900c998168
1 changed files with 18 additions and 0 deletions
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18
fs/btrfs/tree-log.c
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@ -28,6 +28,7 @@
#include "hash.h"
#include "compression.h"
#include "qgroup.h"
#include "inode-map.h"
/* magic values for the inode_only field in btrfs_log_inode:
*
@ -5685,6 +5686,23 @@ int btrfs_recover_log_trees(struct btrfs_root *log_root_tree)
path);
}
if (!ret && wc.stage == LOG_WALK_REPLAY_ALL) {
struct btrfs_root *root = wc.replay_dest;
btrfs_release_path(path);
/*
* We have just replayed everything, and the highest
* objectid of fs roots probably has changed in case
* some inode_item's got replayed.
*
* root->objectid_mutex is not acquired as log replay
* could only happen during mount.
*/
ret = btrfs_find_highest_objectid(root,
&root->highest_objectid);
}
key.offset = found_key.offset - 1;
wc.replay_dest->log_root = NULL;
free_extent_buffer(log->node);