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 <piastryyy@xxxxxxxxx>
---
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
--
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