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CIFS: Separate writing from iovec write 

Reviewed-by: Shirish Pargaonkar <spargaonkar@suse.com>
Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: Steve French <smfrench@gmail.com>
This commit is contained in:
Pavel Shilovsky 2014-06-20 16:10:52 +04:00 committed by Steve French
parent 66386c08be
commit 43de94eadf
1 changed files with 44 additions and 32 deletions
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76
fs/cifs/file.c
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@ -2465,41 +2465,17 @@ wdata_fill_from_iovec(struct cifs_writedata *wdata, struct iov_iter *from,
return 0;
}
static ssize_t
cifs_iovec_write(struct file *file, struct iov_iter *from, loff_t *poffset)
static int
cifs_write_from_iter(loff_t offset, size_t len, struct iov_iter *from,
struct cifsFileInfo *open_file,
struct cifs_sb_info *cifs_sb, struct list_head *wdata_list)
{
int rc = 0;
size_t cur_len;
unsigned long nr_pages, num_pages, i;
size_t len, cur_len;
ssize_t total_written = 0;
loff_t offset;
struct cifsFileInfo *open_file;
struct cifs_tcon *tcon;
struct cifs_sb_info *cifs_sb;
struct cifs_writedata *wdata, *tmp;
struct list_head wdata_list;
int rc;
struct cifs_writedata *wdata;
pid_t pid;
len = iov_iter_count(from);
rc = generic_write_checks(file, poffset, &len, 0);
if (rc)
return rc;
if (!len)
return 0;
iov_iter_truncate(from, len);
INIT_LIST_HEAD(&wdata_list);
cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
open_file = file->private_data;
tcon = tlink_tcon(open_file->tlink);
if (!tcon->ses->server->ops->async_writev)
return -ENOSYS;
offset = *poffset;
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
pid = open_file->pid;
else
@ -2551,11 +2527,47 @@ cifs_iovec_write(struct file *file, struct iov_iter *from, loff_t *poffset)
break;
}
list_add_tail(&wdata->list, &wdata_list);
list_add_tail(&wdata->list, wdata_list);
offset += cur_len;
len -= cur_len;
} while (len > 0);
return rc;
}
static ssize_t
cifs_iovec_write(struct file *file, struct iov_iter *from, loff_t *poffset)
{
size_t len;
ssize_t total_written = 0;
struct cifsFileInfo *open_file;
struct cifs_tcon *tcon;
struct cifs_sb_info *cifs_sb;
struct cifs_writedata *wdata, *tmp;
struct list_head wdata_list;
int rc;
len = iov_iter_count(from);
rc = generic_write_checks(file, poffset, &len, 0);
if (rc)
return rc;
if (!len)
return 0;
iov_iter_truncate(from, len);
INIT_LIST_HEAD(&wdata_list);
cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
open_file = file->private_data;
tcon = tlink_tcon(open_file->tlink);
if (!tcon->ses->server->ops->async_writev)
return -ENOSYS;
rc = cifs_write_from_iter(*poffset, len, from, open_file, cifs_sb,
&wdata_list);
/*
* If at least one write was successfully sent, then discard any rc
* value from the later writes. If the other write succeeds, then