[PATCH 10/22] dio: Convert direct_IO to use iov_iter

From: Dave Kleikamp
Date: Mon Oct 22 2012 - 11:39:21 EST

Change the direct_IO aop to take an iov_iter argument rather than an iovec.
This will get passed down through most filesystems so that only the
__blockdev_direct_IO helper need be aware of whether user or kernel memory
is being passed to the function.

Signed-off-by: Dave Kleikamp <dave.kleikamp@xxxxxxxxxx>
---
Documentation/filesystems/Locking | 4 +--
Documentation/filesystems/vfs.txt | 4 +--
fs/9p/vfs_addr.c | 8 ++---
fs/block_dev.c | 8 ++---
fs/btrfs/inode.c | 61 ++++++++++++++++++++++++---------------
fs/ceph/addr.c | 3 +-
fs/direct-io.c | 19 ++++++------
fs/ext2/inode.c | 8 ++---
fs/ext3/inode.c | 15 ++++------
fs/ext4/ext4.h | 3 +-
fs/ext4/indirect.c | 16 +++++-----
fs/ext4/inode.c | 27 ++++++++---------
fs/fat/inode.c | 10 +++----
fs/fuse/file.c | 11 +++++--
fs/gfs2/aops.c | 7 ++---
fs/hfs/inode.c | 7 ++---
fs/hfsplus/inode.c | 6 ++--
fs/jfs/inode.c | 7 ++---
fs/nfs/direct.c | 13 +++++----
fs/nilfs2/inode.c | 8 ++---
fs/ocfs2/aops.c | 8 ++---
fs/reiserfs/inode.c | 7 ++---
fs/udf/file.c | 3 +-
fs/udf/inode.c | 10 +++----
fs/xfs/xfs_aops.c | 13 ++++-----
include/linux/fs.h | 18 ++++++------
include/linux/nfs_fs.h | 3 +-
mm/filemap.c | 13 +++++++--
mm/page_io.c | 8 +++--
29 files changed, 165 insertions(+), 163 deletions(-)

diff --git a/Documentation/filesystems/Locking b/Documentation/filesystems/Locking
index e540a24..573673e 100644
--- a/Documentation/filesystems/Locking
+++ b/Documentation/filesystems/Locking
@@ -196,8 +196,8 @@ prototypes:
int (*invalidatepage) (struct page *, unsigned long);
int (*releasepage) (struct page *, int);
void (*freepage)(struct page *);
- int (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
- loff_t offset, unsigned long nr_segs);
+ int (*direct_IO)(int, struct kiocb *, struct iov_iter *iter,
+ loff_t offset);
int (*get_xip_mem)(struct address_space *, pgoff_t, int, void **,
unsigned long *);
int (*migratepage)(struct address_space *, struct page *, struct page *);
diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt
index 2ee133e..0a6a8d4 100644
--- a/Documentation/filesystems/vfs.txt
+++ b/Documentation/filesystems/vfs.txt
@@ -580,8 +580,8 @@ struct address_space_operations {
int (*invalidatepage) (struct page *, unsigned long);
int (*releasepage) (struct page *, int);
void (*freepage)(struct page *);
- ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
- loff_t offset, unsigned long nr_segs);
+ ssize_t (*direct_IO)(int, struct kiocb *, struct iov_iter *iter,
+ loff_t offset);
struct page* (*get_xip_page)(struct address_space *, sector_t,
int);
/* migrate the contents of a page to the specified target */
diff --git a/fs/9p/vfs_addr.c b/fs/9p/vfs_addr.c
index 0ad61c6..e70f239 100644
--- a/fs/9p/vfs_addr.c
+++ b/fs/9p/vfs_addr.c
@@ -239,9 +239,8 @@ static int v9fs_launder_page(struct page *page)
* v9fs_direct_IO - 9P address space operation for direct I/O
* @rw: direction (read or write)
* @iocb: target I/O control block
- * @iov: array of vectors that define I/O buffer
+ * @iter: array of vectors that define I/O buffer
* @pos: offset in file to begin the operation
- * @nr_segs: size of iovec array
*
* The presence of v9fs_direct_IO() in the address space ops vector
* allowes open() O_DIRECT flags which would have failed otherwise.
@@ -255,8 +254,7 @@ static int v9fs_launder_page(struct page *page)
*
*/
static ssize_t
-v9fs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
- loff_t pos, unsigned long nr_segs)
+v9fs_direct_IO(int rw, struct kiocb *iocb, struct iov_iter *iter, loff_t pos)
{
/*
* FIXME
@@ -265,7 +263,7 @@ v9fs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
*/
p9_debug(P9_DEBUG_VFS, "v9fs_direct_IO: v9fs_direct_IO (%s) off/no(%lld/%lu) EINVAL\n",
iocb->ki_filp->f_path.dentry->d_name.name,
- (long long)pos, nr_segs);
+ (long long)pos, iter->nr_segs);

return -EINVAL;
}
diff --git a/fs/block_dev.c b/fs/block_dev.c
index b3c1d3d..ba3ed89 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -228,14 +228,14 @@ blkdev_get_blocks(struct inode *inode, sector_t iblock,
}

static ssize_t
-blkdev_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
- loff_t offset, unsigned long nr_segs)
+blkdev_direct_IO(int rw, struct kiocb *iocb, struct iov_iter *iter,
+ loff_t offset)
{
struct file *file = iocb->ki_filp;
struct inode *inode = file->f_mapping->host;

- return __blockdev_direct_IO(rw, iocb, inode, I_BDEV(inode), iov, offset,
- nr_segs, blkdev_get_blocks, NULL, NULL, 0);
+ return __blockdev_direct_IO(rw, iocb, inode, I_BDEV(inode), iter,
+ offset, blkdev_get_blocks, NULL, NULL, 0);
}

int __sync_blockdev(struct block_device *bdev, int wait)
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 85a1e50..50d8329 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -6525,8 +6525,7 @@ free_ordered:
}

static ssize_t check_direct_IO(struct btrfs_root *root, int rw, struct kiocb *iocb,
- const struct iovec *iov, loff_t offset,
- unsigned long nr_segs)
+ struct iov_iter *iter, loff_t offset)
{
int seg;
int i;
@@ -6540,46 +6539,60 @@ static ssize_t check_direct_IO(struct btrfs_root *root, int rw, struct kiocb *io
goto out;

/* Check the memory alignment. Blocks cannot straddle pages */
- for (seg = 0; seg < nr_segs; seg++) {
- addr = (unsigned long)iov[seg].iov_base;
- size = iov[seg].iov_len;
- end += size;
- if ((addr & blocksize_mask) || (size & blocksize_mask))
- goto out;
+ if (iov_iter_has_iovec(iter)) {
+ const struct iovec *iov = iov_iter_iovec(iter);
+
+ for (seg = 0; seg < iter->nr_segs; seg++) {
+ addr = (unsigned long)iov[seg].iov_base;
+ size = iov[seg].iov_len;
+ end += size;
+ if ((addr & blocksize_mask) || (size & blocksize_mask))
+ goto out;

- /* If this is a write we don't need to check anymore */
- if (rw & WRITE)
- continue;
+ /* If this is a write we don't need to check anymore */
+ if (rw & WRITE)
+ continue;

- /*
- * Check to make sure we don't have duplicate iov_base's in this
- * iovec, if so return EINVAL, otherwise we'll get csum errors
- * when reading back.
- */
- for (i = seg + 1; i < nr_segs; i++) {
- if (iov[seg].iov_base == iov[i].iov_base)
+ /*
+ * Check to make sure we don't have duplicate iov_base's
+ * in this iovec, if so return EINVAL, otherwise we'll
+ * get csum errors when reading back.
+ */
+ for (i = seg + 1; i < iter->nr_segs; i++) {
+ if (iov[seg].iov_base == iov[i].iov_base)
+ goto out;
+ }
+ }
+ } else if (iov_iter_has_bvec(iter)) {
+ struct bio_vec *bvec = iov_iter_bvec(iter);
+
+ for (seg = 0; seg < iter->nr_segs; seg++) {
+ addr = (unsigned long)bvec[seg].bv_offset;
+ size = bvec[seg].bv_len;
+ end += size;
+ if ((addr & blocksize_mask) || (size & blocksize_mask))
goto out;
}
- }
+ } else
+ BUG();
+
retval = 0;
out:
return retval;
}

static ssize_t btrfs_direct_IO(int rw, struct kiocb *iocb,
- const struct iovec *iov, loff_t offset,
- unsigned long nr_segs)
+ struct iov_iter *iter, loff_t offset)
{
struct file *file = iocb->ki_filp;
struct inode *inode = file->f_mapping->host;

- if (check_direct_IO(BTRFS_I(inode)->root, rw, iocb, iov,
- offset, nr_segs))
+ if (check_direct_IO(BTRFS_I(inode)->root, rw, iocb, iter, offset))
return 0;

return __blockdev_direct_IO(rw, iocb, inode,
BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev,
- iov, offset, nr_segs, btrfs_get_blocks_direct, NULL,
+ iter, offset, btrfs_get_blocks_direct, NULL,
btrfs_submit_direct, 0);
}

diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index 6690269..a47c4ef 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -1146,8 +1146,7 @@ static int ceph_write_end(struct file *file, struct address_space *mapping,
* never get called.
*/
static ssize_t ceph_direct_io(int rw, struct kiocb *iocb,
- const struct iovec *iov,
- loff_t pos, unsigned long nr_segs)
+ struct iov_iter *iter, loff_t pos)
{
WARN_ON(1);
return -EINVAL;
diff --git a/fs/direct-io.c b/fs/direct-io.c
index 035c0a3..e2733e4 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -1079,9 +1079,9 @@ static int dio_aligned(unsigned long offset, unsigned *blkbits,
*/
static inline ssize_t
do_blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
- struct block_device *bdev, const struct iovec *iov, loff_t offset,
- unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io,
- dio_submit_t submit_io, int flags)
+ struct block_device *bdev, struct iov_iter *iter, loff_t offset,
+ get_block_t get_block, dio_iodone_t end_io, dio_submit_t submit_io,
+ int flags)
{
int seg;
size_t size;
@@ -1095,6 +1095,8 @@ do_blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
size_t bytes;
struct buffer_head map_bh = { 0, };
struct blk_plug plug;
+ const struct iovec *iov = iov_iter_iovec(iter);
+ unsigned long nr_segs = iter->nr_segs;

if (rw & WRITE)
rw = WRITE_ODIRECT;
@@ -1296,9 +1298,9 @@ out:

ssize_t
__blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
- struct block_device *bdev, const struct iovec *iov, loff_t offset,
- unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io,
- dio_submit_t submit_io, int flags)
+ struct block_device *bdev, struct iov_iter *iter, loff_t offset,
+ get_block_t get_block, dio_iodone_t end_io, dio_submit_t submit_io,
+ int flags)
{
/*
* The block device state is needed in the end to finally
@@ -1312,9 +1314,8 @@ __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
prefetch(bdev->bd_queue);
prefetch((char *)bdev->bd_queue + SMP_CACHE_BYTES);

- return do_blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
- nr_segs, get_block, end_io,
- submit_io, flags);
+ return do_blockdev_direct_IO(rw, iocb, inode, bdev, iter, offset,
+ get_block, end_io, submit_io, flags);
}

EXPORT_SYMBOL(__blockdev_direct_IO);
diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index 6363ac6..f1d65f5 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -833,18 +833,16 @@ static sector_t ext2_bmap(struct address_space *mapping, sector_t block)
}

static ssize_t
-ext2_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
- loff_t offset, unsigned long nr_segs)
+ext2_direct_IO(int rw, struct kiocb *iocb, struct iov_iter *iter, loff_t offset)
{
struct file *file = iocb->ki_filp;
struct address_space *mapping = file->f_mapping;
struct inode *inode = mapping->host;
ssize_t ret;

- ret = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs,
- ext2_get_block);
+ ret = blockdev_direct_IO(rw, iocb, inode, iter, offset, ext2_get_block);
if (ret < 0 && (rw & WRITE))
- ext2_write_failed(mapping, offset + iov_length(iov, nr_segs));
+ ext2_write_failed(mapping, offset + iov_iter_count(iter));
return ret;
}

diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c
index 7e87e37..a31d871 100644
--- a/fs/ext3/inode.c
+++ b/fs/ext3/inode.c
@@ -1856,8 +1856,7 @@ static int ext3_releasepage(struct page *page, gfp_t wait)
* VFS code falls back into buffered path in that case so we are safe.
*/
static ssize_t ext3_direct_IO(int rw, struct kiocb *iocb,
- const struct iovec *iov, loff_t offset,
- unsigned long nr_segs)
+ struct iov_iter *iter, loff_t offset)
{
struct file *file = iocb->ki_filp;
struct inode *inode = file->f_mapping->host;
@@ -1865,10 +1864,10 @@ static ssize_t ext3_direct_IO(int rw, struct kiocb *iocb,
handle_t *handle;
ssize_t ret;
int orphan = 0;
- size_t count = iov_length(iov, nr_segs);
+ size_t count = iov_iter_count(iter);
int retries = 0;

- trace_ext3_direct_IO_enter(inode, offset, iov_length(iov, nr_segs), rw);
+ trace_ext3_direct_IO_enter(inode, offset, count, rw);

if (rw == WRITE) {
loff_t final_size = offset + count;
@@ -1892,15 +1891,14 @@ static ssize_t ext3_direct_IO(int rw, struct kiocb *iocb,
}

retry:
- ret = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs,
- ext3_get_block);
+ ret = blockdev_direct_IO(rw, iocb, inode, iter, offset, ext3_get_block);
/*
* In case of error extending write may have instantiated a few
* blocks outside i_size. Trim these off again.
*/
if (unlikely((rw & WRITE) && ret < 0)) {
loff_t isize = i_size_read(inode);
- loff_t end = offset + iov_length(iov, nr_segs);
+ loff_t end = offset + count;

if (end > isize)
ext3_truncate_failed_direct_write(inode);
@@ -1943,8 +1941,7 @@ retry:
ret = err;
}
out:
- trace_ext3_direct_IO_exit(inode, offset,
- iov_length(iov, nr_segs), rw, ret);
+ trace_ext3_direct_IO_exit(inode, offset, count, rw, ret);
return ret;
}

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 3ab2539..f3eba73 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -2030,8 +2030,7 @@ extern void ext4_da_update_reserve_space(struct inode *inode,
extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
struct ext4_map_blocks *map, int flags);
extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
- const struct iovec *iov, loff_t offset,
- unsigned long nr_segs);
+ struct iov_iter *iter, loff_t offset);
extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks, int chunk);
extern void ext4_ind_truncate(struct inode *inode);
diff --git a/fs/ext4/indirect.c b/fs/ext4/indirect.c
index 792e388..40dcec2 100644
--- a/fs/ext4/indirect.c
+++ b/fs/ext4/indirect.c
@@ -772,8 +772,7 @@ out:
* VFS code falls back into buffered path in that case so we are safe.
*/
ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
- const struct iovec *iov, loff_t offset,
- unsigned long nr_segs)
+ struct iov_iter *iter, loff_t offset)
{
struct file *file = iocb->ki_filp;
struct inode *inode = file->f_mapping->host;
@@ -781,7 +780,7 @@ ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
handle_t *handle;
ssize_t ret;
int orphan = 0;
- size_t count = iov_length(iov, nr_segs);
+ size_t count = iov_iter_count(iter);
int retries = 0;

if (rw == WRITE) {
@@ -825,18 +824,17 @@ retry:
goto locked;
}
ret = __blockdev_direct_IO(rw, iocb, inode,
- inode->i_sb->s_bdev, iov,
- offset, nr_segs,
- ext4_get_block, NULL, NULL, 0);
+ inode->i_sb->s_bdev, iter,
+ offset, ext4_get_block, NULL, NULL, 0);
inode_dio_done(inode);
} else {
locked:
- ret = blockdev_direct_IO(rw, iocb, inode, iov,
- offset, nr_segs, ext4_get_block);
+ ret = blockdev_direct_IO(rw, iocb, inode, iter,
+ offset, ext4_get_block);

if (unlikely((rw & WRITE) && ret < 0)) {
loff_t isize = i_size_read(inode);
- loff_t end = offset + iov_length(iov, nr_segs);
+ loff_t end = offset + iov_iter_count(iter);

if (end > isize)
ext4_truncate_failed_write(inode);
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index b3c243b..8a85501 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2992,13 +2992,12 @@ retry:
*
*/
static ssize_t ext4_ext_direct_IO(int rw, struct kiocb *iocb,
- const struct iovec *iov, loff_t offset,
- unsigned long nr_segs)
+ struct iov_iter *iter, loff_t offset)
{
struct file *file = iocb->ki_filp;
struct inode *inode = file->f_mapping->host;
ssize_t ret;
- size_t count = iov_length(iov, nr_segs);
+ size_t count = iov_iter_count(iter);

loff_t final_size = offset + count;
if (rw == WRITE && final_size <= inode->i_size) {
@@ -3058,16 +3057,16 @@ static ssize_t ext4_ext_direct_IO(int rw, struct kiocb *iocb,

if (overwrite)
ret = __blockdev_direct_IO(rw, iocb, inode,
- inode->i_sb->s_bdev, iov,
- offset, nr_segs,
+ inode->i_sb->s_bdev, iter,
+ offset,
ext4_get_block_write_nolock,
ext4_end_io_dio,
NULL,
0);
else
ret = __blockdev_direct_IO(rw, iocb, inode,
- inode->i_sb->s_bdev, iov,
- offset, nr_segs,
+ inode->i_sb->s_bdev, iter,
+ offset,
ext4_get_block_write,
ext4_end_io_dio,
NULL,
@@ -3117,12 +3116,11 @@ static ssize_t ext4_ext_direct_IO(int rw, struct kiocb *iocb,
}

/* for write the the end of file case, we fall back to old way */
- return ext4_ind_direct_IO(rw, iocb, iov, offset, nr_segs);
+ return ext4_ind_direct_IO(rw, iocb, iter, offset);
}

static ssize_t ext4_direct_IO(int rw, struct kiocb *iocb,
- const struct iovec *iov, loff_t offset,
- unsigned long nr_segs)
+ struct iov_iter *iter, loff_t offset)
{
struct file *file = iocb->ki_filp;
struct inode *inode = file->f_mapping->host;
@@ -3134,13 +3132,12 @@ static ssize_t ext4_direct_IO(int rw, struct kiocb *iocb,
if (ext4_should_journal_data(inode))
return 0;

- trace_ext4_direct_IO_enter(inode, offset, iov_length(iov, nr_segs), rw);
+ trace_ext4_direct_IO_enter(inode, offset, iov_iter_count(iter), rw);
if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
- ret = ext4_ext_direct_IO(rw, iocb, iov, offset, nr_segs);
+ ret = ext4_ext_direct_IO(rw, iocb, iter, offset);
else
- ret = ext4_ind_direct_IO(rw, iocb, iov, offset, nr_segs);
- trace_ext4_direct_IO_exit(inode, offset,
- iov_length(iov, nr_segs), rw, ret);
+ ret = ext4_ind_direct_IO(rw, iocb, iter, offset);
+ trace_ext4_direct_IO_exit(inode, offset, iov_iter_count(iter), rw, ret);
return ret;
}

diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 5bafaad..4fd356a 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -184,8 +184,7 @@ static int fat_write_end(struct file *file, struct address_space *mapping,
}

static ssize_t fat_direct_IO(int rw, struct kiocb *iocb,
- const struct iovec *iov,
- loff_t offset, unsigned long nr_segs)
+ struct iov_iter *iter, loff_t offset)
{
struct file *file = iocb->ki_filp;
struct address_space *mapping = file->f_mapping;
@@ -202,7 +201,7 @@ static ssize_t fat_direct_IO(int rw, struct kiocb *iocb,
*
* Return 0, and fallback to normal buffered write.
*/
- loff_t size = offset + iov_length(iov, nr_segs);
+ loff_t size = offset + iov_iter_count(iter);
if (MSDOS_I(inode)->mmu_private < size)
return 0;
}
@@ -211,10 +210,9 @@ static ssize_t fat_direct_IO(int rw, struct kiocb *iocb,
* FAT need to use the DIO_LOCKING for avoiding the race
* condition of fat_get_block() and ->truncate().
*/
- ret = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs,
- fat_get_block);
+ ret = blockdev_direct_IO(rw, iocb, inode, iter, offset, fat_get_block);
if (ret < 0 && (rw & WRITE))
- fat_write_failed(mapping, offset + iov_length(iov, nr_segs));
+ fat_write_failed(mapping, offset + iov_iter_count(iter));

return ret;
}
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 4e42e95..2dd941c 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -2149,17 +2149,22 @@ static ssize_t fuse_loop_dio(struct file *filp, const struct iovec *iov,


static ssize_t
-fuse_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
- loff_t offset, unsigned long nr_segs)
+fuse_direct_IO(int rw, struct kiocb *iocb, struct iov_iter *iter, loff_t offset)
{
ssize_t ret = 0;
struct file *file = NULL;
loff_t pos = 0;

+ /*
+ * We'll eventually want to work with both iovec and bvec
+ */
+ BUG_ON(!iov_iter_has_iovec(iter));
+
file = iocb->ki_filp;
pos = offset;

- ret = fuse_loop_dio(file, iov, nr_segs, &pos, rw);
+ ret = fuse_loop_dio(file, iov_iter_iovec(iter), iter->nr_segs, &pos,
+ rw);

return ret;
}
diff --git a/fs/gfs2/aops.c b/fs/gfs2/aops.c
index 01c4975..872d05c 100644
--- a/fs/gfs2/aops.c
+++ b/fs/gfs2/aops.c
@@ -995,8 +995,7 @@ static int gfs2_ok_for_dio(struct gfs2_inode *ip, int rw, loff_t offset)


static ssize_t gfs2_direct_IO(int rw, struct kiocb *iocb,
- const struct iovec *iov, loff_t offset,
- unsigned long nr_segs)
+ struct iov_iter *iter, loff_t offset)
{
struct file *file = iocb->ki_filp;
struct inode *inode = file->f_mapping->host;
@@ -1020,8 +1019,8 @@ static ssize_t gfs2_direct_IO(int rw, struct kiocb *iocb,
if (rv != 1)
goto out; /* dio not valid, fall back to buffered i/o */

- rv = __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
- offset, nr_segs, gfs2_get_block_direct,
+ rv = __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iter,
+ offset, gfs2_get_block_direct,
NULL, NULL, 0);
out:
gfs2_glock_dq(&gh);
diff --git a/fs/hfs/inode.c b/fs/hfs/inode.c
index 0b35903..986cb91 100644
--- a/fs/hfs/inode.c
+++ b/fs/hfs/inode.c
@@ -117,14 +117,13 @@ static int hfs_releasepage(struct page *page, gfp_t mask)
}

static ssize_t hfs_direct_IO(int rw, struct kiocb *iocb,
- const struct iovec *iov, loff_t offset, unsigned long nr_segs)
+ struct iov_iter *iter, loff_t offset)
{
struct file *file = iocb->ki_filp;
struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host;
ssize_t ret;

- ret = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs,
- hfs_get_block);
+ ret = blockdev_direct_IO(rw, iocb, inode, iter, offset, hfs_get_block);

/*
* In case of error extending write may have instantiated a few
@@ -132,7 +131,7 @@ static ssize_t hfs_direct_IO(int rw, struct kiocb *iocb,
*/
if (unlikely((rw & WRITE) && ret < 0)) {
loff_t isize = i_size_read(inode);
- loff_t end = offset + iov_length(iov, nr_segs);
+ loff_t end = offset + iov_iter_count(iter);

if (end > isize)
vmtruncate(inode, isize);
diff --git a/fs/hfsplus/inode.c b/fs/hfsplus/inode.c
index 2172aa5..94fc092 100644
--- a/fs/hfsplus/inode.c
+++ b/fs/hfsplus/inode.c
@@ -113,13 +113,13 @@ static int hfsplus_releasepage(struct page *page, gfp_t mask)
}

static ssize_t hfsplus_direct_IO(int rw, struct kiocb *iocb,
- const struct iovec *iov, loff_t offset, unsigned long nr_segs)
+ struct iov_iter *iter, loff_t offset)
{
struct file *file = iocb->ki_filp;
struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host;
ssize_t ret;

- ret = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs,
+ ret = blockdev_direct_IO(rw, iocb, inode, iter, offset,
hfsplus_get_block);

/*
@@ -128,7 +128,7 @@ static ssize_t hfsplus_direct_IO(int rw, struct kiocb *iocb,
*/
if (unlikely((rw & WRITE) && ret < 0)) {
loff_t isize = i_size_read(inode);
- loff_t end = offset + iov_length(iov, nr_segs);
+ loff_t end = offset + iov_iter_count(iter);

if (end > isize)
vmtruncate(inode, isize);
diff --git a/fs/jfs/inode.c b/fs/jfs/inode.c
index 4692bf3..7c192e1 100644
--- a/fs/jfs/inode.c
+++ b/fs/jfs/inode.c
@@ -323,14 +323,13 @@ static sector_t jfs_bmap(struct address_space *mapping, sector_t block)
}

static ssize_t jfs_direct_IO(int rw, struct kiocb *iocb,
- const struct iovec *iov, loff_t offset, unsigned long nr_segs)
+ struct iov_iter *iter, loff_t offset)
{
struct file *file = iocb->ki_filp;
struct inode *inode = file->f_mapping->host;
ssize_t ret;

- ret = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs,
- jfs_get_block);
+ ret = blockdev_direct_IO(rw, iocb, inode, iter, offset, jfs_get_block);

/*
* In case of error extending write may have instantiated a few
@@ -338,7 +337,7 @@ static ssize_t jfs_direct_IO(int rw, struct kiocb *iocb,
*/
if (unlikely((rw & WRITE) && ret < 0)) {
loff_t isize = i_size_read(inode);
- loff_t end = offset + iov_length(iov, nr_segs);
+ loff_t end = offset + iov_iter_count(iter);

if (end > isize)
vmtruncate(inode, isize);
diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index cae26cb..4532781 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -112,7 +112,7 @@ static inline int put_dreq(struct nfs_direct_req *dreq)
* nfs_direct_IO - NFS address space operation for direct I/O
* @rw: direction (read or write)
* @iocb: target I/O control block
- * @iov: array of vectors that define I/O buffer
+ * @iter: array of vectors that define I/O buffer
* @pos: offset in file to begin the operation
* @nr_segs: size of iovec array
*
@@ -121,22 +121,25 @@ static inline int put_dreq(struct nfs_direct_req *dreq)
* shunt off direct read and write requests before the VFS gets them,
* so this method is only ever called for swap.
*/
-ssize_t nfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov, loff_t pos, unsigned long nr_segs)
+ssize_t nfs_direct_IO(int rw, struct kiocb *iocb, struct iov_iter *iter,
+ loff_t pos)
{
#ifndef CONFIG_NFS_SWAP
dprintk("NFS: nfs_direct_IO (%s) off/no(%Ld/%lu) EINVAL\n",
iocb->ki_filp->f_path.dentry->d_name.name,
- (long long) pos, nr_segs);
+ (long long) pos, iter->nr_segs);

return -EINVAL;
#else
+ const struct iovec *iov = iov_iter_iovec(iter);
+
VM_BUG_ON(iocb->ki_left != PAGE_SIZE);
VM_BUG_ON(iocb->ki_nbytes != PAGE_SIZE);

if (rw == READ || rw == KERNEL_READ)
- return nfs_file_direct_read(iocb, iov, nr_segs, pos,
+ return nfs_file_direct_read(iocb, iov, iter->nr_segs, pos,
rw == READ ? true : false);
- return nfs_file_direct_write(iocb, iov, nr_segs, pos,
+ return nfs_file_direct_write(iocb, iov, iter->nr_segs, pos,
rw == WRITE ? true : false);
#endif /* CONFIG_NFS_SWAP */
}
diff --git a/fs/nilfs2/inode.c b/fs/nilfs2/inode.c
index 4d31d2c..0577750 100644
--- a/fs/nilfs2/inode.c
+++ b/fs/nilfs2/inode.c
@@ -255,8 +255,8 @@ static int nilfs_write_end(struct file *file, struct address_space *mapping,
}

static ssize_t
-nilfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
- loff_t offset, unsigned long nr_segs)
+nilfs_direct_IO(int rw, struct kiocb *iocb, struct iov_iter *iter,
+ loff_t offset)
{
struct file *file = iocb->ki_filp;
struct inode *inode = file->f_mapping->host;
@@ -266,7 +266,7 @@ nilfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
return 0;

/* Needs synchronization with the cleaner */
- size = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs,
+ size = blockdev_direct_IO(rw, iocb, inode, iter, offset,
nilfs_get_block);

/*
@@ -275,7 +275,7 @@ nilfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
*/
if (unlikely((rw & WRITE) && size < 0)) {
loff_t isize = i_size_read(inode);
- loff_t end = offset + iov_length(iov, nr_segs);
+ loff_t end = offset + iov_iter_count(iter);

if (end > isize)
vmtruncate(inode, isize);
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index 6577432..ed100d5 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -621,9 +621,8 @@ static int ocfs2_releasepage(struct page *page, gfp_t wait)

static ssize_t ocfs2_direct_IO(int rw,
struct kiocb *iocb,
- const struct iovec *iov,
- loff_t offset,
- unsigned long nr_segs)
+ struct iov_iter *iter,
+ loff_t offset)
{
struct file *file = iocb->ki_filp;
struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host;
@@ -640,8 +639,7 @@ static ssize_t ocfs2_direct_IO(int rw,
return 0;

return __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev,
- iov, offset, nr_segs,
- ocfs2_direct_IO_get_blocks,
+ iter, offset, ocfs2_direct_IO_get_blocks,
ocfs2_dio_end_io, NULL, 0);
}

diff --git a/fs/reiserfs/inode.c b/fs/reiserfs/inode.c
index f27f01a..2c7bb7f 100644
--- a/fs/reiserfs/inode.c
+++ b/fs/reiserfs/inode.c
@@ -3064,14 +3064,13 @@ static int reiserfs_releasepage(struct page *page, gfp_t unused_gfp_flags)
/* We thank Mingming Cao for helping us understand in great detail what
to do in this section of the code. */
static ssize_t reiserfs_direct_IO(int rw, struct kiocb *iocb,
- const struct iovec *iov, loff_t offset,
- unsigned long nr_segs)
+ struct iov_iter *iter, loff_t offset)
{
struct file *file = iocb->ki_filp;
struct inode *inode = file->f_mapping->host;
ssize_t ret;

- ret = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs,
+ ret = blockdev_direct_IO(rw, iocb, inode, iter, offset,
reiserfs_get_blocks_direct_io);

/*
@@ -3080,7 +3079,7 @@ static ssize_t reiserfs_direct_IO(int rw, struct kiocb *iocb,
*/
if (unlikely((rw & WRITE) && ret < 0)) {
loff_t isize = i_size_read(inode);
- loff_t end = offset + iov_length(iov, nr_segs);
+ loff_t end = offset + iov_iter_count(iter);

if (end > isize)
vmtruncate(inode, isize);
diff --git a/fs/udf/file.c b/fs/udf/file.c
index 77b5953..c4164dc 100644
--- a/fs/udf/file.c
+++ b/fs/udf/file.c
@@ -119,8 +119,7 @@ static int udf_adinicb_write_end(struct file *file,
}

static ssize_t udf_adinicb_direct_IO(int rw, struct kiocb *iocb,
- const struct iovec *iov,
- loff_t offset, unsigned long nr_segs)
+ struct iov_iter *iter, loff_t offset)
{
/* Fallback to buffered I/O. */
return 0;
diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index df88b95..dd1c3da 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -145,19 +145,17 @@ static int udf_write_begin(struct file *file, struct address_space *mapping,
return ret;
}

-static ssize_t udf_direct_IO(int rw, struct kiocb *iocb,
- const struct iovec *iov,
- loff_t offset, unsigned long nr_segs)
+static ssize_t udf_direct_IO(int rw, struct kiocb *iocb, struct iov_iter *iter,
+ loff_t offset)
{
struct file *file = iocb->ki_filp;
struct address_space *mapping = file->f_mapping;
struct inode *inode = mapping->host;
ssize_t ret;

- ret = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs,
- udf_get_block);
+ ret = blockdev_direct_IO(rw, iocb, inode, iter, offset, udf_get_block);
if (unlikely(ret < 0 && (rw & WRITE)))
- udf_write_failed(mapping, offset + iov_length(iov, nr_segs));
+ udf_write_failed(mapping,offset + iov_iter_count(iter));
return ret;
}

diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index e562dd4..718921b 100644
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -1395,9 +1395,8 @@ STATIC ssize_t
xfs_vm_direct_IO(
int rw,
struct kiocb *iocb,
- const struct iovec *iov,
- loff_t offset,
- unsigned long nr_segs)
+ struct iov_iter *iter,
+ loff_t offset)
{
struct inode *inode = iocb->ki_filp->f_mapping->host;
struct block_device *bdev = xfs_find_bdev_for_inode(inode);
@@ -1405,7 +1404,7 @@ xfs_vm_direct_IO(
ssize_t ret;

if (rw & WRITE) {
- size_t size = iov_length(iov, nr_segs);
+ size_t size = iov_iter_count(iter);

/*
* We need to preallocate a transaction for a size update
@@ -1421,15 +1420,13 @@ xfs_vm_direct_IO(
ioend->io_isdirect = 1;
}

- ret = __blockdev_direct_IO(rw, iocb, inode, bdev, iov,
- offset, nr_segs,
+ ret = __blockdev_direct_IO(rw, iocb, inode, bdev, iter, offset,
xfs_get_blocks_direct,
xfs_end_io_direct_write, NULL, 0);
if (ret != -EIOCBQUEUED && iocb->private)
goto out_trans_cancel;
} else {
- ret = __blockdev_direct_IO(rw, iocb, inode, bdev, iov,
- offset, nr_segs,
+ ret = __blockdev_direct_IO(rw, iocb, inode, bdev, iter, offset,
xfs_get_blocks_direct,
NULL, NULL, 0);
}
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 6ece092..82dd1e9 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -386,8 +386,8 @@ struct address_space_operations {
void (*invalidatepage) (struct page *, unsigned long);
int (*releasepage) (struct page *, gfp_t);
void (*freepage)(struct page *);
- ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
- loff_t offset, unsigned long nr_segs);
+ ssize_t (*direct_IO)(int, struct kiocb *, struct iov_iter *iter,
+ loff_t offset);
int (*get_xip_mem)(struct address_space *, pgoff_t, int,
void **, unsigned long *);
/*
@@ -2399,16 +2399,16 @@ enum {
void dio_end_io(struct bio *bio, int error);

ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
- struct block_device *bdev, const struct iovec *iov, loff_t offset,
- unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io,
- dio_submit_t submit_io, int flags);
+ struct block_device *bdev, struct iov_iter *iter, loff_t offset,
+ get_block_t get_block, dio_iodone_t end_io, dio_submit_t submit_io,
+ int flags);

static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb,
- struct inode *inode, const struct iovec *iov, loff_t offset,
- unsigned long nr_segs, get_block_t get_block)
+ struct inode *inode, struct iov_iter *iter, loff_t offset,
+ get_block_t get_block)
{
- return __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
- offset, nr_segs, get_block, NULL, NULL,
+ return __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iter,
+ offset, get_block, NULL, NULL,
DIO_LOCKING | DIO_SKIP_HOLES);
}
#endif
diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index 1cc2568..4913e3c 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -444,8 +444,7 @@ extern int nfs3_removexattr (struct dentry *, const char *name);
/*
* linux/fs/nfs/direct.c
*/
-extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t,
- unsigned long);
+extern ssize_t nfs_direct_IO(int, struct kiocb *, struct iov_iter *, loff_t);
extern ssize_t nfs_file_direct_read(struct kiocb *iocb,
const struct iovec *iov, unsigned long nr_segs,
loff_t pos, bool uio);
diff --git a/mm/filemap.c b/mm/filemap.c
index 753ec48..d428020 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1409,11 +1409,15 @@ generic_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
goto out; /* skip atime */
size = i_size_read(inode);
if (pos < size) {
+ size_t bytes = iov_length(iov, nr_segs);
retval = filemap_write_and_wait_range(mapping, pos,
- pos + iov_length(iov, nr_segs) - 1);
+ pos + bytes - 1);
if (!retval) {
+ struct iov_iter iter;
+
+ iov_iter_init(&iter, iov, nr_segs, bytes, 0);
retval = mapping->a_ops->direct_IO(READ, iocb,
- iov, pos, nr_segs);
+ &iter, pos);
}
if (retval > 0) {
*ppos = pos + retval;
@@ -2037,6 +2041,7 @@ generic_file_direct_write(struct kiocb *iocb, const struct iovec *iov,
ssize_t written;
size_t write_len;
pgoff_t end;
+ struct iov_iter iter;

if (count != ocount)
*nr_segs = iov_shorten((struct iovec *)iov, *nr_segs, count);
@@ -2068,7 +2073,9 @@ generic_file_direct_write(struct kiocb *iocb, const struct iovec *iov,
}
}

- written = mapping->a_ops->direct_IO(WRITE, iocb, iov, pos, *nr_segs);
+ iov_iter_init(&iter, iov, *nr_segs, write_len, 0);
+
+ written = mapping->a_ops->direct_IO(WRITE, iocb, &iter, pos);

/*
* Finally, try again to invalidate clean pages which might have been
diff --git a/mm/page_io.c b/mm/page_io.c
index 78eee32..33da274 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -208,6 +208,9 @@ int swap_writepage(struct page *page, struct writeback_control *wbc)
.iov_base = kmap(page),
.iov_len = PAGE_SIZE,
};
+ struct iov_iter iter;
+
+ iov_iter_init(&iter, &iov, 1, PAGE_SIZE, 0);

init_sync_kiocb(&kiocb, swap_file);
kiocb.ki_pos = page_file_offset(page);
@@ -215,9 +218,8 @@ int swap_writepage(struct page *page, struct writeback_control *wbc)
kiocb.ki_nbytes = PAGE_SIZE;

unlock_page(page);
- ret = mapping->a_ops->direct_IO(KERNEL_WRITE,
- &kiocb, &iov,
- kiocb.ki_pos, 1);
+ ret = mapping->a_ops->direct_IO(KERNEL_WRITE, &kiocb, &iter,
+ kiocb.ki_pos);
kunmap(page);
if (ret == PAGE_SIZE) {
count_vm_event(PSWPOUT);
--
1.7.12.3

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