diff options
| author |   Hugh Dickins <hughd@google.com> | 2021-05-04 18:32:57 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2021-05-05 11:27:20 -0700 |
| commit | 786b31121a2ce4309a81a7f36d63f02ca588839e (patch) | |
| tree | 06e57daf451657c0a621521303bdbce732b58969 /fs/inode.c | |
| parent | mm: remove nrexceptional from inode (diff) | |
| download | linux-dev-786b31121a2ce4309a81a7f36d63f02ca588839e.tar.xz linux-dev-786b31121a2ce4309a81a7f36d63f02ca588839e.zip | |
mm: remove nrexceptional from inode: remove BUG_ON
clear_inode()'s BUG_ON(!mapping_empty(&inode->i_data)) is unsafe: we
know of two ways in which nodes can and do (on rare occasions) get left
behind. Until those are fixed, do not BUG_ON() nor even WARN_ON().
Yes, this will then leak those nodes (or the next user of the struct
inode may use them); but this has been happening for years, and the new
BUG_ON(!mapping_empty) was only guilty of revealing that. A proper fix
will follow, but no hurry.
Link: https://lkml.kernel.org/r/alpine.LSU.2.11.2104292229380.16080@eggly.anvils
Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/inode.c')
| -rw-r--r-- | fs/inode.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/fs/inode.c b/fs/inode.c index af48d1b722f0..c93500d84264 100644 --- a/fs/inode.c +++ b/fs/inode.c @@ -529,7 +529,14 @@ void clear_inode(struct inode *inode) */ xa_lock_irq(&inode->i_data.i_pages); BUG_ON(inode->i_data.nrpages); - BUG_ON(!mapping_empty(&inode->i_data)); + /* + * Almost always, mapping_empty(&inode->i_data) here; but there are + * two known and long-standing ways in which nodes may get left behind + * (when deep radix-tree node allocation failed partway; or when THP + * collapse_file() failed). Until those two known cases are cleaned up, + * or a cleanup function is called here, do not BUG_ON(!mapping_empty), + * nor even WARN_ON(!mapping_empty). + */ xa_unlock_irq(&inode->i_data.i_pages); BUG_ON(!list_empty(&inode->i_data.private_list)); BUG_ON(!(inode->i_state & I_FREEING)); |