From: Brian Foster Date: Mon, 24 Oct 2016 03:21:08 +0000 (+1100) Subject: xfs: clear cowblocks tag when cow fork is emptied X-Git-Tag: v4.9-rc3~32^2 X-Git-Url: http://git.cascardo.info/?p=cascardo%2Flinux.git;a=commitdiff_plain;h=c17a8ef43d6b80ed3519b828c37d18645445949f xfs: clear cowblocks tag when cow fork is emptied The background cowblocks scan job takes care of scanning for inodes with potentially lingering blocks in the cow fork and clearing them out. If the background scanner reclaims the cow fork blocks, however, it doesn't immediately clear the cowblocks tag from the inode. Instead, the inode remains tagged until the background scanner comes around again, discovers the inode cow fork has no blocks, clears the tag and fires the trace_xfs_inode_free_cowblocks_invalid() tracepoint to indicate that the inode may have been incorrectly tagged. This is not a major functional problem as the tag is ultimately cleared. Nonetheless, clear the tag when an inode cow fork is explicitly emptied to avoid the extra round trip through the background scanner and spurious "invalid" tracepoint. Signed-off-by: Brian Foster Reviewed-by: Christoph Hellwig Reviewed-by: Darrick J. Wong Signed-off-by: Dave Chinner --- diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c index cd308f119e20..a279b4e7f5fe 100644 --- a/fs/xfs/xfs_reflink.c +++ b/fs/xfs/xfs_reflink.c @@ -567,10 +567,14 @@ xfs_reflink_cancel_cow_blocks( } if (++idx >= ifp->if_bytes / sizeof(struct xfs_bmbt_rec)) - return 0; + break; xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx), &got); } + /* clear tag if cow fork is emptied */ + if (!ifp->if_bytes) + xfs_inode_clear_cowblocks_tag(ip); + return error; }