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fs: remove __do_readv_writev 

Split it into one helper each for reads vs writes.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig 2017-05-27 11:16:48 +03:00 committed by Al Viro
parent 26c87fb7d1
commit 19c735868d
1 changed files with 37 additions and 25 deletions
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62
fs/read_write.c
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@ -916,8 +916,8 @@ ssize_t compat_rw_copy_check_uvector(int type,
}
#endif
static ssize_t __do_readv_writev(int type, struct file *file,
struct iov_iter *iter, loff_t *pos, int flags)
static ssize_t do_iter_read(struct file *file, struct iov_iter *iter,
loff_t *pos, int flags)
{
size_t tot_len;
ssize_t ret = 0;
@ -925,29 +925,41 @@ static ssize_t __do_readv_writev(int type, struct file *file,
tot_len = iov_iter_count(iter);
if (!tot_len)
goto out;
ret = rw_verify_area(type, file, pos, tot_len);
ret = rw_verify_area(READ, file, pos, tot_len);
if (ret < 0)
goto out;
return ret;
if (type != READ)
file_start_write(file);
if ((type == READ && file->f_op->read_iter) ||
(type == WRITE && file->f_op->write_iter))
ret = do_iter_readv_writev(file, iter, pos, type, flags);
if (file->f_op->read_iter)
ret = do_iter_readv_writev(file, iter, pos, READ, flags);
else
ret = do_loop_readv_writev(file, iter, pos, type, flags);
if (type != READ)
file_end_write(file);
ret = do_loop_readv_writev(file, iter, pos, READ, flags);
out:
if ((ret + (type == READ)) > 0) {
if (type == READ)
fsnotify_access(file);
else
fsnotify_modify(file);
}
if (ret >= 0)
fsnotify_access(file);
return ret;
}
static ssize_t do_iter_write(struct file *file, struct iov_iter *iter,
loff_t *pos, int flags)
{
size_t tot_len;
ssize_t ret = 0;
tot_len = iov_iter_count(iter);
if (!tot_len)
return 0;
ret = rw_verify_area(WRITE, file, pos, tot_len);
if (ret < 0)
return ret;
file_start_write(file);
if (file->f_op->write_iter)
ret = do_iter_readv_writev(file, iter, pos, WRITE, flags);
else
ret = do_loop_readv_writev(file, iter, pos, WRITE, flags);
file_end_write(file);
if (ret > 0)
fsnotify_modify(file);
return ret;
}
@ -968,7 +980,7 @@ ssize_t vfs_readv(struct file *file, const struct iovec __user *vec,
if (ret < 0)
return ret;
ret = __do_readv_writev(READ, file, &iter, pos, flags);
ret = do_iter_read(file, &iter, pos, flags);
kfree(iov);
return ret;
}
@ -991,7 +1003,7 @@ ssize_t vfs_writev(struct file *file, const struct iovec __user *vec,
if (ret < 0)
return ret;
ret = __do_readv_writev(WRITE, file, &iter, pos, flags);
ret = do_iter_write(file, &iter, pos, flags);
kfree(iov);
return ret;
}
@ -1161,7 +1173,7 @@ static size_t compat_readv(struct file *file,
ret = compat_import_iovec(READ, vec, vlen, UIO_FASTIOV, &iov, &iter);
if (ret < 0)
goto out;
ret = __do_readv_writev(READ, file, &iter, pos, flags);
ret = do_iter_read(file, &iter, pos, flags);
kfree(iov);
out:
if (ret > 0)
@ -1274,7 +1286,7 @@ static size_t compat_writev(struct file *file,
ret = compat_import_iovec(WRITE, vec, vlen, UIO_FASTIOV, &iov, &iter);
if (ret < 0)
goto out;
ret = __do_readv_writev(WRITE, file, &iter, pos, flags);
ret = do_iter_write(file, &iter, pos, flags);
kfree(iov);
out:
if (ret > 0)