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| author |   Al Viro <viro@zeniv.linux.org.uk> | 2015-04-03 15:06:43 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2015-04-11 22:29:37 -0400 |
| commit | 493c84c0722ac991a96df2fd6c7798b2126b626c (patch) | |
| tree | 5c7166cf90d8e9afa5be2f48b174a9da6fd14d03 | |
| parent | Merge branch '9p-iov_iter' into for-next (diff) | |
| download | linux-dev-493c84c0722ac991a96df2fd6c7798b2126b626c.tar.xz linux-dev-493c84c0722ac991a96df2fd6c7798b2126b626c.zip | |
new helper: __vfs_write()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| -rw-r--r-- | fs/read_write.c | 28 | ||||
| -rw-r--r-- | include/linux/fs.h | 1 |
2 files changed, 17 insertions, 12 deletions
diff --git a/fs/read_write.c b/fs/read_write.c index 69128b378646..9d7952a6829b 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -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); diff --git a/include/linux/fs.h b/include/linux/fs.h index 20fe15fe236d..4a1cb00bd805 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -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 *, |