diff options
| -rw-r--r-- | fs/cifs/file.c | 48 |
1 files changed, 20 insertions, 28 deletions
diff --git a/fs/cifs/file.c b/fs/cifs/file.c index 1b322d041f1..22c37254b64 100644 --- a/fs/cifs/file.c +++ b/fs/cifs/file.c @@ -2505,42 +2505,34 @@ cifs_strict_writev(struct kiocb *iocb, const struct iovec *iov, struct cifsFileInfo *cfile = (struct cifsFileInfo *) iocb->ki_filp->private_data; struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); + ssize_t written; -#ifdef CONFIG_CIFS_SMB2 - /* - * 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; + if (cinode->clientCanCacheAll) { + if (cap_unix(tcon->ses) && + (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) + && ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) + return generic_file_aio_write(iocb, iov, nr_segs, pos); + return cifs_writev(iocb, iov, nr_segs, pos); } -#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) - return cifs_user_writev(iocb, iov, nr_segs, pos); - - if (cap_unix(tcon->ses) && - (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && - ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) - return generic_file_aio_write(iocb, iov, nr_segs, pos); - - return cifs_writev(iocb, iov, nr_segs, pos); + written = cifs_user_writev(iocb, iov, nr_segs, pos); + if (written > 0 && cinode->clientCanCacheRead) { + /* + * Windows 7 server can delay breaking level2 oplock if a write + * request comes - break it on the client to prevent reading + * an old data. + */ + cifs_invalidate_mapping(inode); + cFYI(1, "Set no oplock for inode=%p after a write operation", + inode); + cinode->clientCanCacheRead = false; + } + return written; } static struct cifs_readdata * |