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iov_iter_truncate()

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Now It Can Be Done(tm) - we don't need to do iov_shorten() in
generic_file_direct_write() anymore, now that all ->direct_IO()
instances are converted to proper iov_iter methods and honour
iter->count and iter->iov_offset properly.

Get rid of count/ocount arguments of generic_file_direct_write(),
while we are at it.

Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Al Viro 2014-03-22 06:51:37 -04:00
commit 0c949334a9
7 changed files with 40 additions and 42 deletions
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19
mm/filemap.c
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@ -2345,8 +2345,7 @@ int pagecache_write_end(struct file *file, struct address_space *mapping,
EXPORT_SYMBOL(pagecache_write_end);
ssize_t
generic_file_direct_write(struct kiocb *iocb, struct iov_iter *from,
loff_t pos, size_t count, size_t ocount)
generic_file_direct_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos)
{
struct file *file = iocb->ki_filp;
struct address_space *mapping = file->f_mapping;
@ -2356,10 +2355,7 @@ generic_file_direct_write(struct kiocb *iocb, struct iov_iter *from,
pgoff_t end;
struct iov_iter data;
if (count != ocount)
from->nr_segs = iov_shorten((struct iovec *)from->iov, from->nr_segs, count);
write_len = iov_length(from->iov, from->nr_segs);
write_len = iov_iter_count(from);
end = (pos + write_len - 1) >> PAGE_CACHE_SHIFT;
written = filemap_write_and_wait_range(mapping, pos, pos + write_len - 1);
@ -2568,7 +2564,6 @@ ssize_t __generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
{
struct file *file = iocb->ki_filp;
struct address_space * mapping = file->f_mapping;
size_t ocount; /* original count */
size_t count; /* after file limit checks */
struct inode *inode = mapping->host;
loff_t pos = iocb->ki_pos;
@ -2577,7 +2572,8 @@ ssize_t __generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
ssize_t status;
struct iov_iter from;
count = ocount = iov_length(iov, nr_segs);
count = iov_length(iov, nr_segs);
iov_iter_init(&from, WRITE, iov, nr_segs, count);
/* We can write back this queue in page reclaim */
current->backing_dev_info = mapping->backing_dev_info;
@ -2588,6 +2584,8 @@ ssize_t __generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
if (count == 0)
goto out;
iov_iter_truncate(&from, count);
err = file_remove_suid(file);
if (err)
goto out;
@ -2596,14 +2594,11 @@ ssize_t __generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
if (err)
goto out;
iov_iter_init(&from, WRITE, iov, nr_segs, count);
/* coalesce the iovecs and go direct-to-BIO for O_DIRECT */
if (unlikely(file->f_flags & O_DIRECT)) {
loff_t endbyte;
written = generic_file_direct_write(iocb, &from, pos,
count, ocount);
written = generic_file_direct_write(iocb, &from, pos);
if (written < 0 || written == count)
goto out;