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| author | Pavel Shilovsky <piastry@etersoft.ru> | 2012-09-19 06:22:45 -0700 |
|---|---|---|
| committer | Steve French <smfrench@gmail.com> | 2012-09-24 21:46:33 -0500 |
| commit | 25078105fbe14e7b3270391eaa11514bec787a52 (patch) | |
| tree | 13ae2774d194c9ae2c6566a885503164b5ed9434 /fs/cifs/file.c | |
| parent | b8c32dbb0deb287a5fcb78251e4eae6c7275760d (diff) | |
| download | linux-25078105fbe14e7b3270391eaa11514bec787a52.tar.gz linux-25078105fbe14e7b3270391eaa11514bec787a52.tar.bz2 linux-25078105fbe14e7b3270391eaa11514bec787a52.zip | |
CIFS: Fix cache coherency for read oplock case
When we have a file opened with read oplock and we are writing a data
to this file, we need to store the data in the cache and then send to
the server to ensure that the next read operation will get a coherent
data.
Also mark it as CONFIG_CIFS_SMB2 because it's more suitable for SMB2
code but can fix some CIFS problems too (when server delays sending
an oplock break after a write request). We can drop this ifdefs
dependence in future.
Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
Signed-off-by: Steve French <sfrench@us.ibm.com>
Diffstat (limited to 'fs/cifs/file.c')
| -rw-r--r-- | fs/cifs/file.c | 27 |
1 files changed, 23 insertions, 4 deletions
diff --git a/fs/cifs/file.c b/fs/cifs/file.c index ccad858d2d67..e93e3d2c69e6 100644 --- a/fs/cifs/file.c +++ b/fs/cifs/file.c @@ -2461,11 +2461,30 @@ cifs_strict_writev(struct kiocb *iocb, const struct iovec *iov, iocb->ki_filp->private_data; struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); +#ifdef CONFIG_CIFS_SMB2 /* - * In strict cache mode we need to write the data to the server exactly - * from the pos to pos+len-1 rather than flush all affected pages - * because it may cause a error with mandatory locks on these pages but - * not on the region from pos to ppos+len-1. + * If we have an oplock for read and want to write a data to the file + * we need to store it in the page cache and then push it to the server + * to be sure the next read will get a valid data. + */ + if (!cinode->clientCanCacheAll && cinode->clientCanCacheRead) { + ssize_t written; + int rc; + + written = generic_file_aio_write(iocb, iov, nr_segs, pos); + rc = filemap_fdatawrite(inode->i_mapping); + if (rc) + return (ssize_t)rc; + + return written; + } +#endif + + /* + * For non-oplocked files in strict cache mode we need to write the data + * to the server exactly from the pos to pos+len-1 rather than flush all + * affected pages because it may cause a error with mandatory locks on + * these pages but not on the region from pos to ppos+len-1. */ if (!cinode->clientCanCacheAll) |