diff options
author | Pavel Shilovsky <piastryyy@gmail.com> | 2019-03-04 17:48:01 -0800 |
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committer | Steve French <stfrench@microsoft.com> | 2019-03-05 18:10:51 -0600 |
commit | 6dfbd84684700cb58b34e8602c01c12f3d2595c8 (patch) | |
tree | d543bce68a9221a4f9dcfce5953973320b118777 | |
parent | 96281b9e46ebb90cefa8b57b11ca40e5ac05f649 (diff) | |
download | linux-6dfbd84684700cb58b34e8602c01c12f3d2595c8.tar.bz2 |
CIFS: Fix read after write for files with read caching
When we have a READ lease for a file and have just issued a write
operation to the server we need to purge the cache and set oplock/lease
level to NONE to avoid reading stale data. Currently we do that
only if a write operation succedeed thus not covering cases when
a request was sent to the server but a negative error code was
returned later for some other reasons (e.g. -EIOCBQUEUED or -EINTR).
Fix this by turning off caching regardless of the error code being
returned.
The patches fixes generic tests 075 and 112 from the xfs-tests.
Cc: <stable@vger.kernel.org>
Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
-rw-r--r-- | fs/cifs/file.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/fs/cifs/file.c b/fs/cifs/file.c index 9b53f33137b3..4c144c1f50eb 100644 --- a/fs/cifs/file.c +++ b/fs/cifs/file.c @@ -3096,14 +3096,16 @@ cifs_strict_writev(struct kiocb *iocb, struct iov_iter *from) * these pages but not on the region from pos to ppos+len-1. */ written = cifs_user_writev(iocb, from); - if (written > 0 && CIFS_CACHE_READ(cinode)) { + if (CIFS_CACHE_READ(cinode)) { /* - * Windows 7 server can delay breaking level2 oplock if a write - * request comes - break it on the client to prevent reading - * an old data. + * We have read level caching and we have just sent a write + * request to the server thus making data in the cache stale. + * Zap the cache and set oplock/lease level to NONE to avoid + * reading stale data from the cache. All subsequent read + * operations will read new data from the server. */ cifs_zap_mapping(inode); - cifs_dbg(FYI, "Set no oplock for inode=%p after a write operation\n", + cifs_dbg(FYI, "Set Oplock/Lease to NONE for inode=%p after write\n", inode); cinode->oplock = 0; } |