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authorDavid Howells <dhowells@redhat.com>2022-03-03 16:05:18 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2022-03-03 22:35:21 +0300
commitb08968f196d498b19e9d0841d76a03862258f2d8 (patch)
treed4149e996a676d087f9b0ff8417c1345de2abb18 /fs/cachefiles
parentb949c21fc23ecaccef89582f251e6281cad1f81e (diff)
downloadlinux-b08968f196d498b19e9d0841d76a03862258f2d8.tar.xz
cachefiles: Fix incorrect length to fallocate()
When cachefiles_shorten_object() calls fallocate() to shape the cache file to match the DIO size, it passes the total file size it wants to achieve, not the amount of zeros that should be inserted. Since this is meant to preallocate that amount of storage for the file, it can cause the cache to fill up the disk and hit ENOSPC. Fix this by passing the length actually required to go from the current EOF to the desired EOF. Fixes: 7623ed6772de ("cachefiles: Implement cookie resize for truncate") Reported-by: Jeffle Xu <jefflexu@linux.alibaba.com> Signed-off-by: David Howells <dhowells@redhat.com> Tested-by: Jeff Layton <jlayton@kernel.org> Reviewed-by: Jeff Layton <jlayton@kernel.org> cc: linux-cachefs@redhat.com Link: https://lore.kernel.org/r/164630854858.3665356.17419701804248490708.stgit@warthog.procyon.org.uk # v1 Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/cachefiles')
-rw-r--r--fs/cachefiles/interface.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/cachefiles/interface.c b/fs/cachefiles/interface.c
index 51c968cd00a6..ae93cee9d25d 100644
--- a/fs/cachefiles/interface.c
+++ b/fs/cachefiles/interface.c
@@ -254,7 +254,7 @@ static bool cachefiles_shorten_object(struct cachefiles_object *object,
ret = cachefiles_inject_write_error();
if (ret == 0)
ret = vfs_fallocate(file, FALLOC_FL_ZERO_RANGE,
- new_size, dio_size);
+ new_size, dio_size - new_size);
if (ret < 0) {
trace_cachefiles_io_error(object, file_inode(file), ret,
cachefiles_trace_fallocate_error);