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lift generic_write_checks() into callers of __generic_file_write_iter()

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2015-04-07 11:28:12 -04:00
parent 0b8def9d6d
commit 5f380c7fa7
5 changed files with 60 additions and 30 deletions
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39
fs/cifs/file.c
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@@ -2673,8 +2673,8 @@ 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;
size_t count;
/*
* We need to hold the sem to be sure nobody modifies lock list
@@ -2682,23 +2682,30 @@ 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),
count = iov_iter_count(from);
rc = generic_write_checks(file, &iocb->ki_pos, &count, 0);
if (rc)
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)) {
CIFS_WRITE_OP))
rc = __generic_file_write_iter(iocb, from);
mutex_unlock(&inode->i_mutex);
else
rc = -EACCES;
out:
mutex_unlock(&inode->i_mutex);
if (rc > 0) {
ssize_t err;
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;