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Message-Id: <1446654807-6935-4-git-send-email-mchristi@redhat.com>
Date: Wed, 4 Nov 2015 10:32:58 -0600
From: mchristi@...hat.com
To: linux-fsdevel@...r.kernel.org, dm-devel@...hat.com,
linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-scsi@...r.kernel.org, drbd-dev@...ts.linbit.com
Cc: Mike Christie <mchristi@...hat.com>
Subject: [PATCH 03/32] dio/btrfs: prep dio->submit_bio users for bi_rw split.
From: Mike Christie <mchristi@...hat.com>
Instead of passing around a bitmap of ops and flags, the
next patches separate it into a op field and a flags field.
This patch prepares the dio code and dio->submit_bio users
for the split.
Note that the next patches will fix up the submit_bio() call
with along other users of that function.
Signed-off-by: Mike Christie <mchristi@...hat.com>
---
fs/btrfs/inode.c | 9 ++++-----
fs/direct-io.c | 34 +++++++++++++++++++++-------------
include/linux/fs.h | 4 ++--
3 files changed, 27 insertions(+), 20 deletions(-)
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 611b66d..0ad8bab 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -8196,14 +8196,13 @@ out_err:
return 0;
}
-static void btrfs_submit_direct(int rw, struct bio *dio_bio,
+static void btrfs_submit_direct(int op, int op_flags, struct bio *dio_bio,
struct inode *inode, loff_t file_offset)
{
struct btrfs_dio_private *dip = NULL;
struct bio *io_bio = NULL;
struct btrfs_io_bio *btrfs_bio;
int skip_sum;
- int write = rw & REQ_WRITE;
int ret = 0;
skip_sum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM;
@@ -8232,14 +8231,14 @@ static void btrfs_submit_direct(int rw, struct bio *dio_bio,
btrfs_bio = btrfs_io_bio(io_bio);
btrfs_bio->logical = file_offset;
- if (write) {
+ if (op == REQ_OP_WRITE) {
io_bio->bi_end_io = btrfs_endio_direct_write;
} else {
io_bio->bi_end_io = btrfs_endio_direct_read;
dip->subio_endio = btrfs_subio_endio_read;
}
- ret = btrfs_submit_direct_hook(rw, dip, skip_sum);
+ ret = btrfs_submit_direct_hook(op | op_flags, dip, skip_sum);
if (!ret)
return;
@@ -8267,7 +8266,7 @@ free_ordered:
dip = NULL;
io_bio = NULL;
} else {
- if (write) {
+ if (op == REQ_OP_WRITE) {
struct btrfs_ordered_extent *ordered;
ordered = btrfs_lookup_ordered_extent(inode,
diff --git a/fs/direct-io.c b/fs/direct-io.c
index 1125629..5e1b1a0 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -108,7 +108,8 @@ struct dio_submit {
/* dio_state communicated between submission path and end_io */
struct dio {
int flags; /* doesn't change */
- int rw;
+ int op;
+ int op_flags;
struct inode *inode;
loff_t i_size; /* i_size when submitted */
dio_iodone_t *end_io; /* IO completion function */
@@ -160,7 +161,7 @@ static inline int dio_refill_pages(struct dio *dio, struct dio_submit *sdio)
ret = iov_iter_get_pages(sdio->iter, dio->pages, LONG_MAX, DIO_PAGES,
&sdio->from);
- if (ret < 0 && sdio->blocks_available && (dio->rw & WRITE)) {
+ if (ret < 0 && sdio->blocks_available && (dio->op == REQ_OP_WRITE)) {
struct page *page = ZERO_PAGE(0);
/*
* A memory fault, but the filesystem has some outstanding
@@ -239,7 +240,8 @@ static ssize_t dio_complete(struct dio *dio, loff_t offset, ssize_t ret,
transferred = dio->result;
/* Check for short read case */
- if ((dio->rw == READ) && ((offset + transferred) > dio->i_size))
+ if ((dio->op == REQ_OP_READ) &&
+ ((offset + transferred) > dio->i_size))
transferred = dio->i_size - offset;
}
@@ -257,7 +259,7 @@ static ssize_t dio_complete(struct dio *dio, loff_t offset, ssize_t ret,
inode_dio_end(dio->inode);
if (is_async) {
- if (dio->rw & WRITE) {
+ if (dio->op == REQ_OP_WRITE) {
int err;
err = generic_write_sync(dio->iocb->ki_filp, offset,
@@ -393,14 +395,14 @@ static inline void dio_bio_submit(struct dio *dio, struct dio_submit *sdio)
dio->refcount++;
spin_unlock_irqrestore(&dio->bio_lock, flags);
- if (dio->is_async && dio->rw == READ)
+ if (dio->is_async && dio->op == REQ_OP_READ)
bio_set_pages_dirty(bio);
if (sdio->submit_io)
- sdio->submit_io(dio->rw, bio, dio->inode,
+ sdio->submit_io(dio->op, dio->op_flags, bio, dio->inode,
sdio->logical_offset_in_bio);
else
- submit_bio(dio->rw, bio);
+ submit_bio(dio->op | dio->op_flags, bio);
sdio->bio = NULL;
sdio->boundary = 0;
@@ -464,14 +466,14 @@ static int dio_bio_complete(struct dio *dio, struct bio *bio)
if (bio->bi_error)
dio->io_error = -EIO;
- if (dio->is_async && dio->rw == READ) {
+ if (dio->is_async && dio->op == REQ_OP_READ) {
bio_check_pages_dirty(bio); /* transfers ownership */
err = bio->bi_error;
} else {
bio_for_each_segment_all(bvec, bio, i) {
struct page *page = bvec->bv_page;
- if (dio->rw == READ && !PageCompound(page))
+ if (dio->op == REQ_OP_READ && !PageCompound(page))
set_page_dirty_lock(page);
page_cache_release(page);
}
@@ -623,7 +625,7 @@ static int get_more_blocks(struct dio *dio, struct dio_submit *sdio,
* which may decide to handle it or also return an unmapped
* buffer head.
*/
- create = dio->rw & WRITE;
+ create = dio->op == REQ_OP_WRITE;
if (dio->flags & DIO_SKIP_HOLES) {
if (sdio->block_in_file < (i_size_read(dio->inode) >>
sdio->blkbits))
@@ -773,7 +775,7 @@ submit_page_section(struct dio *dio, struct dio_submit *sdio, struct page *page,
{
int ret = 0;
- if (dio->rw & WRITE) {
+ if (dio->op == REQ_OP_WRITE) {
/*
* Read accounting is performed in submit_bio()
*/
@@ -973,7 +975,7 @@ do_holes:
loff_t i_size_aligned;
/* AKPM: eargh, -ENOTBLK is a hack */
- if (dio->rw & WRITE) {
+ if (dio->op == REQ_OP_WRITE) {
page_cache_release(page);
return -ENOTBLK;
}
@@ -1176,7 +1178,13 @@ do_blockdev_direct_IO(struct kiocb *iocb, struct inode *inode,
dio->is_async = true;
dio->inode = inode;
- dio->rw = iov_iter_rw(iter) == WRITE ? WRITE_ODIRECT : READ;
+ if (iov_iter_rw(iter) == WRITE) {
+ dio->op = REQ_OP_WRITE;
+ dio->op_flags = WRITE_ODIRECT;
+ } else {
+ dio->op = REQ_OP_READ;
+ dio->op_flags = 0;
+ }
/*
* For AIO O_(D)SYNC writes we need to defer completions to a workqueue
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 72d8a84..601b842 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2678,8 +2678,8 @@ extern int generic_file_open(struct inode * inode, struct file * filp);
extern int nonseekable_open(struct inode * inode, struct file * filp);
#ifdef CONFIG_BLOCK
-typedef void (dio_submit_t)(int rw, struct bio *bio, struct inode *inode,
- loff_t file_offset);
+typedef void (dio_submit_t)(int op, int op_flags, struct bio *bio,
+ struct inode *inode, loff_t file_offset);
enum {
/* need locking between buffered and direct access */
--
1.8.3.1
--
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