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Diffstat (limited to 'fs/cifs/file.c')
-rw-r--r--fs/cifs/file.c93
1 files changed, 35 insertions, 58 deletions
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index ca30c391a894..ca2bc5406306 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -2560,10 +2560,9 @@ cifs_write_from_iter(loff_t offset, size_t len, struct iov_iter *from,
return rc;
}
-static ssize_t
-cifs_iovec_write(struct file *file, struct iov_iter *from, loff_t *poffset)
+ssize_t cifs_user_writev(struct kiocb *iocb, struct iov_iter *from)
{
- size_t len;
+ struct file *file = iocb->ki_filp;
ssize_t total_written = 0;
struct cifsFileInfo *open_file;
struct cifs_tcon *tcon;
@@ -2573,15 +2572,15 @@ cifs_iovec_write(struct file *file, struct iov_iter *from, loff_t *poffset)
struct iov_iter saved_from;
int rc;
- len = iov_iter_count(from);
- rc = generic_write_checks(file, poffset, &len, 0);
- if (rc)
- return rc;
-
- if (!len)
- return 0;
+ /*
+ * BB - optimize the way when signing is disabled. We can drop this
+ * extra memory-to-memory copying and use iovec buffers for constructing
+ * write request.
+ */
- iov_iter_truncate(from, len);
+ rc = generic_write_checks(iocb, from);
+ if (rc <= 0)
+ return rc;
INIT_LIST_HEAD(&wdata_list);
cifs_sb = CIFS_FILE_SB(file);
@@ -2593,8 +2592,8 @@ cifs_iovec_write(struct file *file, struct iov_iter *from, loff_t *poffset)
memcpy(&saved_from, from, sizeof(struct iov_iter));
- rc = cifs_write_from_iter(*poffset, len, from, open_file, cifs_sb,
- &wdata_list);
+ rc = cifs_write_from_iter(iocb->ki_pos, iov_iter_count(from), from,
+ open_file, cifs_sb, &wdata_list);
/*
* If at least one write was successfully sent, then discard any rc
@@ -2633,7 +2632,7 @@ restart_loop:
memcpy(&tmp_from, &saved_from,
sizeof(struct iov_iter));
iov_iter_advance(&tmp_from,
- wdata->offset - *poffset);
+ wdata->offset - iocb->ki_pos);
rc = cifs_write_from_iter(wdata->offset,
wdata->bytes, &tmp_from,
@@ -2650,34 +2649,13 @@ restart_loop:
kref_put(&wdata->refcount, cifs_uncached_writedata_release);
}
- if (total_written > 0)
- *poffset += total_written;
+ if (unlikely(!total_written))
+ return rc;
+ iocb->ki_pos += total_written;
+ set_bit(CIFS_INO_INVALID_MAPPING, &CIFS_I(file_inode(file))->flags);
cifs_stats_bytes_written(tcon, total_written);
- return total_written ? total_written : (ssize_t)rc;
-}
-
-ssize_t cifs_user_writev(struct kiocb *iocb, struct iov_iter *from)
-{
- ssize_t written;
- struct inode *inode;
- loff_t pos = iocb->ki_pos;
-
- inode = file_inode(iocb->ki_filp);
-
- /*
- * BB - optimize the way when signing is disabled. We can drop this
- * extra memory-to-memory copying and use iovec buffers for constructing
- * write request.
- */
-
- written = cifs_iovec_write(iocb->ki_filp, from, &pos);
- if (written > 0) {
- set_bit(CIFS_INO_INVALID_MAPPING, &CIFS_I(inode)->flags);
- iocb->ki_pos = pos;
- }
-
- return written;
+ return total_written;
}
static ssize_t
@@ -2688,8 +2666,7 @@ cifs_writev(struct kiocb *iocb, struct iov_iter *from)
struct inode *inode = file->f_mapping->host;
struct cifsInodeInfo *cinode = CIFS_I(inode);
struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;
- ssize_t rc = -EACCES;
- loff_t lock_pos = iocb->ki_pos;
+ ssize_t rc;
/*
* We need to hold the sem to be sure nobody modifies lock list
@@ -2697,23 +2674,24 @@ cifs_writev(struct kiocb *iocb, struct iov_iter *from)
*/
down_read(&cinode->lock_sem);
mutex_lock(&inode->i_mutex);
- if (file->f_flags & O_APPEND)
- lock_pos = i_size_read(inode);
- if (!cifs_find_lock_conflict(cfile, lock_pos, iov_iter_count(from),
+
+ rc = generic_write_checks(iocb, from);
+ if (rc <= 0)
+ goto out;
+
+ if (!cifs_find_lock_conflict(cfile, iocb->ki_pos, iov_iter_count(from),
server->vals->exclusive_lock_type, NULL,
- CIFS_WRITE_OP)) {
+ CIFS_WRITE_OP))
rc = __generic_file_write_iter(iocb, from);
- mutex_unlock(&inode->i_mutex);
-
- if (rc > 0) {
- ssize_t err;
+ else
+ rc = -EACCES;
+out:
+ mutex_unlock(&inode->i_mutex);
- err = generic_write_sync(file, iocb->ki_pos - rc, rc);
- if (err < 0)
- rc = err;
- }
- } else {
- mutex_unlock(&inode->i_mutex);
+ if (rc > 0) {
+ ssize_t err = generic_write_sync(file, iocb->ki_pos - rc, rc);
+ if (err < 0)
+ rc = err;
}
up_read(&cinode->lock_sem);
return rc;
@@ -3877,8 +3855,7 @@ void cifs_oplock_break(struct work_struct *work)
* Direct IO is not yet supported in the cached mode.
*/
static ssize_t
-cifs_direct_io(int rw, struct kiocb *iocb, struct iov_iter *iter,
- loff_t pos)
+cifs_direct_io(struct kiocb *iocb, struct iov_iter *iter, loff_t pos)
{
/*
* FIXME