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new helper: __vfs_write()

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2015-04-03 15:06:43 -04:00
parent c48722c636
commit 493c84c072
2 changed files with 17 additions and 12 deletions
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28
fs/read_write.c
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@ -527,6 +527,20 @@ ssize_t new_sync_write(struct file *filp, const char __user *buf, size_t len, lo
EXPORT_SYMBOL(new_sync_write);
ssize_t __vfs_write(struct file *file, const char __user *p, size_t count,
loff_t *pos)
{
if (file->f_op->write)
return file->f_op->write(file, p, count, pos);
else if (file->f_op->aio_write)
return do_sync_write(file, p, count, pos);
else if (file->f_op->write_iter)
return new_sync_write(file, p, count, pos);
else
return -EINVAL;
}
EXPORT_SYMBOL(__vfs_write);
ssize_t __kernel_write(struct file *file, const char *buf, size_t count, loff_t *pos)
{
mm_segment_t old_fs;
@ -541,12 +555,7 @@ ssize_t __kernel_write(struct file *file, const char *buf, size_t count, loff_t
p = (__force const char __user *)buf;
if (count > MAX_RW_COUNT)
count = MAX_RW_COUNT;
if (file->f_op->write)
ret = file->f_op->write(file, p, count, pos);
else if (file->f_op->aio_write)
ret = do_sync_write(file, p, count, pos);
else
ret = new_sync_write(file, p, count, pos);
ret = __vfs_write(file, p, count, pos);
set_fs(old_fs);
if (ret > 0) {
fsnotify_modify(file);
@ -573,12 +582,7 @@ ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_
if (ret >= 0) {
count = ret;
file_start_write(file);
if (file->f_op->write)
ret = file->f_op->write(file, buf, count, pos);
else if (file->f_op->aio_write)
ret = do_sync_write(file, buf, count, pos);
else
ret = new_sync_write(file, buf, count, pos);
ret = __vfs_write(file, buf, count, pos);
if (ret > 0) {
fsnotify_modify(file);
add_wchar(current, ret);

1
include/linux/fs.h
View File

@ -1639,6 +1639,7 @@ ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
struct iovec **ret_pointer);
extern ssize_t __vfs_read(struct file *, char __user *, size_t, loff_t *);
extern ssize_t __vfs_write(struct file *, const char __user *, size_t, loff_t *);
extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
extern ssize_t vfs_readv(struct file *, const struct iovec __user *,