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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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18
fs/fuse/file.c
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@ -1188,8 +1188,7 @@ static ssize_t fuse_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 count = 0;
size_t ocount = 0;
size_t count;
ssize_t written = 0;
ssize_t written_buffered = 0;
struct inode *inode = mapping->host;
@ -1208,7 +1207,8 @@ static ssize_t fuse_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
WARN_ON(iocb->ki_pos != pos);
count = ocount = iov_length(iov, nr_segs);
count = iov_length(iov, nr_segs);
iov_iter_init(&i, WRITE, iov, nr_segs, count);
mutex_lock(&inode->i_mutex);
/* We can write back this queue in page reclaim */
@ -1217,11 +1217,11 @@ static ssize_t fuse_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
if (err)
goto out;
iov_iter_init(&i, WRITE, iov, nr_segs, count);
if (count == 0)
goto out;
iov_iter_truncate(&i, count);
err = file_remove_suid(file);
if (err)
goto out;
@ -1231,8 +1231,8 @@ static ssize_t fuse_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
goto out;
if (file->f_flags & O_DIRECT) {
written = generic_file_direct_write(iocb, &i, pos, count, ocount);
if (written < 0 || written == count)
written = generic_file_direct_write(iocb, &i, pos);
if (written < 0 || !iov_iter_count(&i))
goto out;
pos += written;
@ -1469,8 +1469,7 @@ static ssize_t __fuse_direct_write(struct fuse_io_priv *io,
res = generic_write_checks(file, ppos, &count, 0);
if (!res) {
if (iter->count > count)
iter->count = count;
iov_iter_truncate(iter, count);
res = fuse_direct_io(io, iter, ppos, FUSE_DIO_WRITE);
}
@ -2896,8 +2895,7 @@ fuse_direct_IO(int rw, struct kiocb *iocb, struct iov_iter *iter,
if (offset >= i_size)
return 0;
count = min_t(loff_t, count, fuse_round_up(i_size - offset));
if (iter->count > count)
iter->count = count;
iov_iter_truncate(iter, count);
}
io = kmalloc(sizeof(struct fuse_io_priv), GFP_KERNEL);