2010/11/29 Pavel Shilovsky <piastryyy@xxxxxxxxx>:
> On strict cache mode if we don't have Exclusive oplock we write a data to
> the server through cifs_user_write. Also set inode invalid_mapping flag if
> we have written anything to the server.
>
> Signed-off-by: Pavel Shilovsky <piastryyy@xxxxxxxxx>
> ---
> fs/cifs/cifsfs.c | 49 ++++++++++++++++++++++++++++++++++++++++++++-----
> 1 files changed, 44 insertions(+), 5 deletions(-)
>
> diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
> index 431c46e..0732538 100644
> --- a/fs/cifs/cifsfs.c
> +++ b/fs/cifs/cifsfs.c
> @@ -609,12 +609,51 @@ 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
>
>
See correct one in try #4.
--
Best regards,
Pavel Shilovsky.
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