On strict cache mode if we don't have Exclusive oplock we write a data to the server through cifs_user_write. Then if we Level II oplock store it in the cache, otherwise - invalidate inode pages affected by this writing.
Signed-off-by: Pavel Shilovsky <[email protected]> --- fs/cifs/cifsfs.c | 51 ++++++++++++++++++++++++++++++++++++++++++++++----- 1 files changed, 46 insertions(+), 5 deletions(-) diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c index 370acdc..df17261 100644 --- a/fs/cifs/cifsfs.c +++ b/fs/cifs/cifsfs.c @@ -611,12 +611,53 @@ static ssize_t cifs_file_aio_read(struct kiocb *iocb, const struct iovec *iov, static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov, unsigned long nr_segs, loff_t pos) { - struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode; - ssize_t written; + struct inode *inode; + struct cifs_sb_info *cifs_sb; + ssize_t written = 0, retval; + unsigned long i; + + inode = iocb->ki_filp->f_path.dentry->d_inode; + + if (CIFS_I(inode)->clientCanCacheAll) + return generic_file_aio_write(iocb, iov, nr_segs, pos); + + cifs_sb = CIFS_SB(iocb->ki_filp->f_path.dentry->d_sb); + + if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) == 0) { + int rc; + + written = generic_file_aio_write(iocb, iov, nr_segs, pos); + + rc = filemap_fdatawrite(inode->i_mapping); + if (rc) + cFYI(1, "cifs_file_aio_write: %d rc on %p inode", + rc, inode); + return written; + } + + /* + * 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. + */ + + for (i = 0; i < nr_segs; i++) { + retval = cifs_user_write(iocb->ki_filp, iov[i].iov_base, + iov[i].iov_len, &pos); + if (retval < 0) { + written = written ? written : retval; + break; + } + + written += retval; + } + + iocb->ki_pos = pos; + + if (written > 0) + CIFS_I(inode)->invalid_mapping = true; - written = generic_file_aio_write(iocb, iov, nr_segs, pos); - if (!CIFS_I(inode)->clientCanCacheAll) - filemap_fdatawrite(inode->i_mapping); return written; } -- 1.7.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-cifs" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
