diff options
Diffstat (limited to 'fs/read_write.c')
| -rw-r--r-- | fs/read_write.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/fs/read_write.c b/fs/read_write.c index 819ef3faf..8ace6ec15 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -494,6 +494,30 @@ ssize_t __vfs_write(struct file *file, const char __user *p, size_t count, } EXPORT_SYMBOL(__vfs_write); +vfs_readf_t vfs_readf(struct file *file) +{ + const struct file_operations *fop = file->f_op; + + if (fop->read) + return fop->read; + if (fop->read_iter) + return new_sync_read; + return ERR_PTR(-ENOSYS); +} +EXPORT_SYMBOL(vfs_readf); + +vfs_writef_t vfs_writef(struct file *file) +{ + const struct file_operations *fop = file->f_op; + + if (fop->write) + return fop->write; + if (fop->write_iter) + return new_sync_write; + return ERR_PTR(-ENOSYS); +} +EXPORT_SYMBOL(vfs_writef); + ssize_t __kernel_write(struct file *file, const char *buf, size_t count, loff_t *pos) { mm_segment_t old_fs; |