diff options
Diffstat (limited to 'fs/read_write.c')
| -rw-r--r-- | fs/read_write.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/fs/read_write.c b/fs/read_write.c index 9a5cb9c2f0d4..0786717c4c3a 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -488,6 +488,7 @@ ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos) inc_syscr(current); return ret; } +EXPORT_SYMBOL_GPL(vfs_read); static ssize_t new_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos) { @@ -507,6 +508,30 @@ static ssize_t new_sync_write(struct file *filp, const char __user *buf, size_t return ret; } +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); /* doesn't have ->read(|_iter)() op */ +} +EXPORT_SYMBOL_GPL(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); /* doesn't have ->write(|_iter)() op */ +} +EXPORT_SYMBOL_GPL(vfs_writef); + /* caller is responsible for file_start_write/file_end_write */ ssize_t __kernel_write(struct file *file, const void *buf, size_t count, loff_t *pos) { @@ -594,6 +619,7 @@ ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_ file_end_write(file); return ret; } +EXPORT_SYMBOL_GPL(vfs_write); /* file_ppos returns &file->f_pos or NULL if file is stream */ static inline loff_t *file_ppos(struct file *file) |