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btrfs: add tracing for failed reservations 

When debugging ENOSPC issues, it's nice to be able to see which
reservations failed as well as the ones which succeeded.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
This commit is contained in:
Jeff Mahoney 2013-10-16 16:27:01 -04:00 committed by Chris Mason
parent 8b558c5f09
commit cab45e22da
1 changed files with 7 additions and 0 deletions
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7
fs/btrfs/extent-tree.c
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@ -3684,6 +3684,9 @@ int btrfs_check_data_free_space(struct inode *inode, u64 bytes)
goto again;
}
trace_btrfs_space_reservation(root->fs_info,
"space_info:enospc",
data_sinfo->flags, bytes, 1);
return -ENOSPC;
}
data_sinfo->bytes_may_use += bytes;
@ -4335,6 +4338,10 @@ static int reserve_metadata_bytes(struct btrfs_root *root,
!block_rsv_use_bytes(global_rsv, orig_bytes))
ret = 0;
}
if (ret == -ENOSPC)
trace_btrfs_space_reservation(root->fs_info,
"space_info:enospc",
space_info->flags, orig_bytes, 1);
if (flushing) {
spin_lock(&space_info->lock);
space_info->flush = 0;