path: root/fs
diff options
authorNeilBrown <neilb@suse.com>2017-07-24 13:18:50 +1000
committerAnna Schumaker <Anna.Schumaker@Netapp.com>2017-07-27 11:22:42 -0400
commit442ce0499c0535f8972b68fa1fda357357a5c953 (patch)
tree9c9cca5f5e42919f8b6e820e713de5c4d131e04a /fs
parent1e6f209515a08de29ec53b653eac73b50efd949c (diff)
NFS: invalidate file size when taking a lock.
Prior to commit ca0daa277aca ("NFS: Cache aggressively when file is open for writing"), NFS would revalidate, or invalidate, the file size when taking a lock. Since that commit it only invalidates the file content. If the file size is changed on the server while wait for the lock, the client will have an incorrect understanding of the file size and could corrupt data. This particularly happens when writing beyond the (supposed) end of file and can be easily be demonstrated with posix_fallocate(). If an application opens an empty file, waits for a write lock, and then calls posix_fallocate(), glibc will determine that the underlying filesystem doesn't support fallocate (assuming version 4.1 or earlier) and will write out a '0' byte at the end of each 4K page in the region being fallocated that is after the end of the file. NFS will (usually) detect that these writes are beyond EOF and will expand them to cover the whole page, and then will merge the pages. Consequently, NFS will write out large blocks of zeroes beyond where it thought EOF was. If EOF had moved, the pre-existing part of the file will be over-written. Locking should have protected against this, but it doesn't. This patch restores the use of nfs_zap_caches() which invalidated the cached attributes. When posix_fallocate() asks for the file size, the request will go to the server and get a correct answer. cc: stable@vger.kernel.org (v4.8+) Fixes: ca0daa277aca ("NFS: Cache aggressively when file is open for writing") Signed-off-by: NeilBrown <neilb@suse.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'fs')
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index 5713eb32a45e..d264363559db 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -750,7 +750,7 @@ do_setlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
- nfs_zap_mapping(inode, filp->f_mapping);
+ nfs_zap_caches(inode);
return status;