switch generic_write_checks() to iocb and iter
... returning -E... upon error and amount of data left in iter after
(possible) truncation upon success. Note, that normal case gives
a non-zero (positive) return value, so any tests for != 0 _must_ be
updated.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Conflicts:
fs/ext4/file.c
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 4202e74..ca2bc54 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -2563,7 +2563,6 @@
ssize_t cifs_user_writev(struct kiocb *iocb, struct iov_iter *from)
{
struct file *file = iocb->ki_filp;
- size_t len;
ssize_t total_written = 0;
struct cifsFileInfo *open_file;
struct cifs_tcon *tcon;
@@ -2579,16 +2578,10 @@
* write request.
*/
- len = iov_iter_count(from);
- rc = generic_write_checks(file, &iocb->ki_pos, &len);
- if (rc)
+ rc = generic_write_checks(iocb, from);
+ if (rc <= 0)
return rc;
- if (!len)
- return 0;
-
- iov_iter_truncate(from, len);
-
INIT_LIST_HEAD(&wdata_list);
cifs_sb = CIFS_FILE_SB(file);
open_file = file->private_data;
@@ -2599,8 +2592,8 @@
memcpy(&saved_from, from, sizeof(struct iov_iter));
- rc = cifs_write_from_iter(iocb->ki_pos, 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
@@ -2674,7 +2667,6 @@
struct cifsInodeInfo *cinode = CIFS_I(inode);
struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;
ssize_t rc;
- size_t count;
/*
* We need to hold the sem to be sure nobody modifies lock list
@@ -2683,16 +2675,10 @@
down_read(&cinode->lock_sem);
mutex_lock(&inode->i_mutex);
- count = iov_iter_count(from);
- rc = generic_write_checks(file, &iocb->ki_pos, &count);
- if (rc)
+ rc = generic_write_checks(iocb, from);
+ if (rc <= 0)
goto out;
- if (count == 0)
- goto out;
-
- iov_iter_truncate(from, count);
-
if (!cifs_find_lock_conflict(cfile, iocb->ki_pos, iov_iter_count(from),
server->vals->exclusive_lock_type, NULL,
CIFS_WRITE_OP))