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shmem: switch to ->read_iter() 

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2014-04-02 20:00:02 -04:00
parent fb9096a344
commit 2ba5bbed0c
1 changed files with 5 additions and 10 deletions
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15
mm/shmem.c
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@ -1402,8 +1402,7 @@ shmem_write_end(struct file *file, struct address_space *mapping,
return copied; return copied;
} }
static ssize_t shmem_file_aio_read(struct kiocb *iocb, static ssize_t shmem_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
const struct iovec *iov, unsigned long nr_segs, loff_t pos)
{ {
struct file *file = iocb->ki_filp; struct file *file = iocb->ki_filp;
struct inode *inode = file_inode(file); struct inode *inode = file_inode(file);
@ -1413,11 +1412,7 @@ static ssize_t shmem_file_aio_read(struct kiocb *iocb,
enum sgp_type sgp = SGP_READ; enum sgp_type sgp = SGP_READ;
int error = 0; int error = 0;
ssize_t retval = 0; ssize_t retval = 0;
size_t count = iov_length(iov, nr_segs);
loff_t *ppos = &iocb->ki_pos; loff_t *ppos = &iocb->ki_pos;
struct iov_iter iter;
iov_iter_init(&iter, READ, iov, nr_segs, count);
/* /*
* Might this read be for a stacking filesystem? Then when reading * Might this read be for a stacking filesystem? Then when reading
@ -1493,14 +1488,14 @@ static ssize_t shmem_file_aio_read(struct kiocb *iocb,
* Ok, we have the page, and it's up-to-date, so * Ok, we have the page, and it's up-to-date, so
* now we can copy it to user space... * now we can copy it to user space...
*/ */
ret = copy_page_to_iter(page, offset, nr, &iter); ret = copy_page_to_iter(page, offset, nr, to);
retval += ret; retval += ret;
offset += ret; offset += ret;
index += offset >> PAGE_CACHE_SHIFT; index += offset >> PAGE_CACHE_SHIFT;
offset &= ~PAGE_CACHE_MASK; offset &= ~PAGE_CACHE_MASK;
page_cache_release(page); page_cache_release(page);
if (!iov_iter_count(&iter)) if (!iov_iter_count(to))
break; break;
if (ret < nr) { if (ret < nr) {
error = -EFAULT; error = -EFAULT;
@ -2622,9 +2617,9 @@ static const struct file_operations shmem_file_operations = {
.mmap = shmem_mmap, .mmap = shmem_mmap,
#ifdef CONFIG_TMPFS #ifdef CONFIG_TMPFS
.llseek = shmem_file_llseek, .llseek = shmem_file_llseek,
.read = do_sync_read, .read = new_sync_read,
.write = do_sync_write, .write = do_sync_write,
.aio_read = shmem_file_aio_read, .read_iter = shmem_file_read_iter,
.aio_write = generic_file_aio_write, .aio_write = generic_file_aio_write,
.fsync = noop_fsync, .fsync = noop_fsync,
.splice_read = shmem_file_splice_read, .splice_read = shmem_file_splice_read,