diff options
| -rw-r--r-- | fs/read_write.c | 80 |
1 files changed, 29 insertions, 51 deletions
diff --git a/fs/read_write.c b/fs/read_write.c index 820a3f06c46a..12a216021f87 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -834,25 +834,15 @@ out: return ret; } -static ssize_t do_readv_writev(int type, struct file *file, - const struct iovec __user * uvector, - unsigned long nr_segs, loff_t *pos, - int flags) +static ssize_t __do_readv_writev(int type, struct file *file, + struct iov_iter *iter, loff_t *pos, int flags) { size_t tot_len; - struct iovec iovstack[UIO_FASTIOV]; - struct iovec *iov = iovstack; - struct iov_iter iter; - ssize_t ret; + ssize_t ret = 0; io_fn_t fn; iter_fn_t iter_fn; - ret = import_iovec(type, uvector, nr_segs, - ARRAY_SIZE(iovstack), &iov, &iter); - if (ret < 0) - return ret; - - tot_len = iov_iter_count(&iter); + tot_len = iov_iter_count(iter); if (!tot_len) goto out; ret = rw_verify_area(type, file, pos, tot_len); @@ -869,15 +859,14 @@ static ssize_t do_readv_writev(int type, struct file *file, } if (iter_fn) - ret = do_iter_readv_writev(file, &iter, pos, iter_fn, flags); + ret = do_iter_readv_writev(file, iter, pos, iter_fn, flags); else - ret = do_loop_readv_writev(file, &iter, pos, fn, flags); + ret = do_loop_readv_writev(file, iter, pos, fn, flags); if (type != READ) file_end_write(file); out: - kfree(iov); if ((ret + (type == READ)) > 0) { if (type == READ) fsnotify_access(file); @@ -887,6 +876,27 @@ out: return ret; } +static ssize_t do_readv_writev(int type, struct file *file, + const struct iovec __user *uvector, + unsigned long nr_segs, loff_t *pos, + int flags) +{ + struct iovec iovstack[UIO_FASTIOV]; + struct iovec *iov = iovstack; + struct iov_iter iter; + ssize_t ret; + + ret = import_iovec(type, uvector, nr_segs, + ARRAY_SIZE(iovstack), &iov, &iter); + if (ret < 0) + return ret; + + ret = __do_readv_writev(type, file, &iter, pos, flags); + kfree(iov); + + return ret; +} + ssize_t vfs_readv(struct file *file, const struct iovec __user *vec, unsigned long vlen, loff_t *pos, int flags) { @@ -1064,51 +1074,19 @@ static ssize_t compat_do_readv_writev(int type, struct file *file, unsigned long nr_segs, loff_t *pos, int flags) { - compat_ssize_t tot_len; struct iovec iovstack[UIO_FASTIOV]; struct iovec *iov = iovstack; struct iov_iter iter; ssize_t ret; - io_fn_t fn; - iter_fn_t iter_fn; ret = compat_import_iovec(type, uvector, nr_segs, UIO_FASTIOV, &iov, &iter); if (ret < 0) return ret; - tot_len = iov_iter_count(&iter); - if (!tot_len) - goto out; - ret = rw_verify_area(type, file, pos, tot_len); - if (ret < 0) - goto out; - - if (type == READ) { - fn = file->f_op->read; - iter_fn = file->f_op->read_iter; - } else { - fn = (io_fn_t)file->f_op->write; - iter_fn = file->f_op->write_iter; - file_start_write(file); - } - - if (iter_fn) - ret = do_iter_readv_writev(file, &iter, pos, iter_fn, flags); - else - ret = do_loop_readv_writev(file, &iter, pos, fn, flags); - - if (type != READ) - file_end_write(file); - -out: + ret = __do_readv_writev(type, file, &iter, pos, flags); kfree(iov); - if ((ret + (type == READ)) > 0) { - if (type == READ) - fsnotify_access(file); - else - fsnotify_modify(file); - } + return ret; } |