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Message-Id: <1373493739-2243-1-git-send-email-jack@suse.cz>
Date: Thu, 11 Jul 2013 00:02:18 +0200
From: Jan Kara <jack@...e.cz>
To: linux-fsdevel@...r.kernel.org
Cc: linux-ext4@...r.kernel.org, xfs@....sgi.com, hch@...radead.org,
Jeff Moyer <jmoyer@...hat.com>,
Al Viro <viro@...IV.linux.org.uk>,
Christoph Hellwig <hch@....de>, Jan Kara <jack@...e.cz>
Subject: [PATCH 1/2] direct-io: Implement generic deferred AIO completions
From: Christoph Hellwig <hch@...radead.org>
Add support to the core direct-io code to defer AIO completions to user
context using a workqueue. This replaces opencoded and less efficient
code in XFS and ext4 and will be needed to properly support O_(D)SYNC
for AIO.
The communication between the filesystem and the direct I/O code requires
a new buffer head flag, which is a bit ugly but not avoidable until the
direct I/O code stops abusing the buffer_head structure for communicating
with the filesystems.
Currently this creates a per-superblock unbound workqueue for these
completions, which is taken from an earlier patch by Jan Kara. I'm
not really convinced about this use and would prefer a "normal" global
workqueue with a high concurrency limit, but this needs further discussion.
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Jan Kara <jack@...e.cz>
---
fs/direct-io.c | 50 ++++++++++++++++++++++++++++++---------------
fs/ext4/ext4.h | 11 ----------
fs/ext4/inode.c | 28 +++++++------------------
fs/ext4/page-io.c | 30 +++++++--------------------
fs/ext4/super.c | 16 ---------------
fs/ocfs2/aops.c | 8 +-------
fs/super.c | 28 +++++++++++++++++--------
fs/xfs/xfs_aops.c | 28 +++++--------------------
fs/xfs/xfs_aops.h | 3 ---
include/linux/buffer_head.h | 2 ++
include/linux/fs.h | 7 +++++--
11 files changed, 81 insertions(+), 130 deletions(-)
diff --git a/fs/direct-io.c b/fs/direct-io.c
index 7ab90f5..36bddad 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -127,6 +127,7 @@ struct dio {
spinlock_t bio_lock; /* protects BIO fields below */
int page_errors; /* errno from get_user_pages() */
int is_async; /* is IO async ? */
+ bool defer_completion; /* defer AIO completion to workqueue? */
int io_error; /* IO error in completion path */
unsigned long refcount; /* direct_io_worker() and bios */
struct bio *bio_list; /* singly linked via bi_private */
@@ -141,7 +142,10 @@ struct dio {
* allocation time. Don't add new fields after pages[] unless you
* wish that they not be zeroed.
*/
- struct page *pages[DIO_PAGES]; /* page buffer */
+ union {
+ struct page *pages[DIO_PAGES]; /* page buffer */
+ struct work_struct complete_work;/* deferred AIO completion */
+ };
} ____cacheline_aligned_in_smp;
static struct kmem_cache *dio_cache __read_mostly;
@@ -221,16 +225,16 @@ static inline struct page *dio_get_page(struct dio *dio,
* dio_complete() - called when all DIO BIO I/O has been completed
* @offset: the byte offset in the file of the completed operation
*
- * This releases locks as dictated by the locking type, lets interested parties
- * know that a DIO operation has completed, and calculates the resulting return
- * code for the operation.
+ * This drops i_dio_count, lets interested parties know that a DIO operation
+ * has completed, and calculates the resulting return code for the operation.
*
* It lets the filesystem know if it registered an interest earlier via
* get_block. Pass the private field of the map buffer_head so that
* filesystems can use it to hold additional state between get_block calls and
* dio_complete.
*/
-static ssize_t dio_complete(struct dio *dio, loff_t offset, ssize_t ret, bool is_async)
+static ssize_t dio_complete(struct dio *dio, loff_t offset, ssize_t ret,
+ bool is_async)
{
ssize_t transferred = 0;
@@ -258,19 +262,26 @@ static ssize_t dio_complete(struct dio *dio, loff_t offset, ssize_t ret, bool is
if (ret == 0)
ret = transferred;
- if (dio->end_io && dio->result) {
- dio->end_io(dio->iocb, offset, transferred,
- dio->private, ret, is_async);
- } else {
- inode_dio_done(dio->inode);
- if (is_async)
- aio_complete(dio->iocb, ret, 0);
- }
+ if (dio->end_io && dio->result)
+ dio->end_io(dio->iocb, offset, transferred, dio->private);
+
+ inode_dio_done(dio->inode);
+ if (is_async)
+ aio_complete(dio->iocb, ret, 0);
+ kmem_cache_free(dio_cache, dio);
return ret;
}
+static void dio_aio_complete_work(struct work_struct *work)
+{
+ struct dio *dio = container_of(work, struct dio, complete_work);
+
+ dio_complete(dio, dio->iocb->ki_pos, 0, true);
+}
+
static int dio_bio_complete(struct dio *dio, struct bio *bio);
+
/*
* Asynchronous IO callback.
*/
@@ -290,8 +301,13 @@ static void dio_bio_end_aio(struct bio *bio, int error)
spin_unlock_irqrestore(&dio->bio_lock, flags);
if (remaining == 0) {
- dio_complete(dio, dio->iocb->ki_pos, 0, true);
- kmem_cache_free(dio_cache, dio);
+ if (dio->result && dio->defer_completion) {
+ INIT_WORK(&dio->complete_work, dio_aio_complete_work);
+ queue_work(dio->inode->i_sb->s_dio_done_wq,
+ &dio->complete_work);
+ } else {
+ dio_complete(dio, dio->iocb->ki_pos, 0, true);
+ }
}
}
@@ -581,6 +597,9 @@ static int get_more_blocks(struct dio *dio, struct dio_submit *sdio,
/* Store for completion */
dio->private = map_bh->b_private;
+
+ if (buffer_defer_completion(map_bh))
+ dio->defer_completion = true;
}
return ret;
}
@@ -1269,7 +1288,6 @@ do_blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
if (drop_refcount(dio) == 0) {
retval = dio_complete(dio, offset, retval, false);
- kmem_cache_free(dio_cache, dio);
} else
BUG_ON(retval != -EIOCBQUEUED);
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index b577e45..bb64697 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -180,7 +180,6 @@ struct ext4_map_blocks {
* Flags for ext4_io_end->flags
*/
#define EXT4_IO_END_UNWRITTEN 0x0001
-#define EXT4_IO_END_DIRECT 0x0002
/*
* For converting uninitialized extents on a work queue. 'handle' is used for
@@ -196,8 +195,6 @@ typedef struct ext4_io_end {
unsigned int flag; /* unwritten or not */
loff_t offset; /* offset in the file */
ssize_t size; /* size of the extent */
- struct kiocb *iocb; /* iocb struct for AIO */
- int result; /* error value for AIO */
atomic_t count; /* reference counter */
} ext4_io_end_t;
@@ -900,11 +897,9 @@ struct ext4_inode_info {
* Completed IOs that need unwritten extents handling and don't have
* transaction reserved
*/
- struct list_head i_unrsv_conversion_list;
atomic_t i_ioend_count; /* Number of outstanding io_end structs */
atomic_t i_unwritten; /* Nr. of inflight conversions pending */
struct work_struct i_rsv_conversion_work;
- struct work_struct i_unrsv_conversion_work;
spinlock_t i_block_reservation_lock;
@@ -1276,8 +1271,6 @@ struct ext4_sb_info {
struct flex_groups *s_flex_groups;
ext4_group_t s_flex_groups_allocated;
- /* workqueue for unreserved extent convertions (dio) */
- struct workqueue_struct *unrsv_conversion_wq;
/* workqueue for reserved extent conversions (buffered io) */
struct workqueue_struct *rsv_conversion_wq;
@@ -1340,9 +1333,6 @@ static inline void ext4_set_io_unwritten_flag(struct inode *inode,
struct ext4_io_end *io_end)
{
if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
- /* Writeback has to have coversion transaction reserved */
- WARN_ON(EXT4_SB(inode->i_sb)->s_journal && !io_end->handle &&
- !(io_end->flag & EXT4_IO_END_DIRECT));
io_end->flag |= EXT4_IO_END_UNWRITTEN;
atomic_inc(&EXT4_I(inode)->i_unwritten);
}
@@ -2715,7 +2705,6 @@ extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
extern void ext4_io_submit_init(struct ext4_io_submit *io,
struct writeback_control *wbc);
extern void ext4_end_io_rsv_work(struct work_struct *work);
-extern void ext4_end_io_unrsv_work(struct work_struct *work);
extern void ext4_io_submit(struct ext4_io_submit *io);
extern int ext4_bio_write_page(struct ext4_io_submit *io,
struct page *page,
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 0188e65..56faf56 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -730,8 +730,12 @@ static int _ext4_get_block(struct inode *inode, sector_t iblock,
ret = ext4_map_blocks(handle, inode, &map, flags);
if (ret > 0) {
+ ext4_io_end_t *io_end = ext4_inode_aio(inode);
+
map_bh(bh, inode->i_sb, map.m_pblk);
bh->b_state = (bh->b_state & ~EXT4_MAP_FLAGS) | map.m_flags;
+ if (io_end && io_end->flag & EXT4_IO_END_UNWRITTEN)
+ set_buffer_defer_completion(bh);
bh->b_size = inode->i_sb->s_blocksize * map.m_len;
ret = 0;
}
@@ -2997,19 +3001,13 @@ static int ext4_get_block_write_nolock(struct inode *inode, sector_t iblock,
}
static void ext4_end_io_dio(struct kiocb *iocb, loff_t offset,
- ssize_t size, void *private, int ret,
- bool is_async)
+ ssize_t size, void *private)
{
- struct inode *inode = file_inode(iocb->ki_filp);
ext4_io_end_t *io_end = iocb->private;
/* if not async direct IO just return */
- if (!io_end) {
- inode_dio_done(inode);
- if (is_async)
- aio_complete(iocb, ret, 0);
+ if (!io_end)
return;
- }
ext_debug("ext4_end_io_dio(): io_end 0x%p "
"for inode %lu, iocb 0x%p, offset %llu, size %zd\n",
@@ -3019,11 +3017,7 @@ static void ext4_end_io_dio(struct kiocb *iocb, loff_t offset,
iocb->private = NULL;
io_end->offset = offset;
io_end->size = size;
- if (is_async) {
- io_end->iocb = iocb;
- io_end->result = ret;
- }
- ext4_put_io_end_defer(io_end);
+ ext4_put_io_end(io_end);
}
/*
@@ -3108,7 +3102,6 @@ static ssize_t ext4_ext_direct_IO(int rw, struct kiocb *iocb,
ret = -ENOMEM;
goto retake_lock;
}
- io_end->flag |= EXT4_IO_END_DIRECT;
/*
* Grab reference for DIO. Will be dropped in ext4_end_io_dio()
*/
@@ -3153,13 +3146,6 @@ static ssize_t ext4_ext_direct_IO(int rw, struct kiocb *iocb,
if (ret <= 0 && ret != -EIOCBQUEUED && iocb->private) {
WARN_ON(iocb->private != io_end);
WARN_ON(io_end->flag & EXT4_IO_END_UNWRITTEN);
- WARN_ON(io_end->iocb);
- /*
- * Generic code already did inode_dio_done() so we
- * have to clear EXT4_IO_END_DIRECT to not do it for
- * the second time.
- */
- io_end->flag = 0;
ext4_put_io_end(io_end);
iocb->private = NULL;
}
diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c
index 48786cd..d25fab4 100644
--- a/fs/ext4/page-io.c
+++ b/fs/ext4/page-io.c
@@ -122,10 +122,6 @@ static void ext4_release_io_end(ext4_io_end_t *io_end)
ext4_finish_bio(bio);
bio_put(bio);
}
- if (io_end->flag & EXT4_IO_END_DIRECT)
- inode_dio_done(io_end->inode);
- if (io_end->iocb)
- aio_complete(io_end->iocb, io_end->result, 0);
kmem_cache_free(io_end_cachep, io_end);
}
@@ -203,19 +199,14 @@ static void ext4_add_complete_io(ext4_io_end_t *io_end)
struct workqueue_struct *wq;
unsigned long flags;
- BUG_ON(!(io_end->flag & EXT4_IO_END_UNWRITTEN));
+ /* Only reserved conversions from writeback should enter here */
+ WARN_ON(!(io_end->flag & EXT4_IO_END_UNWRITTEN));
+ WARN_ON(!io_end->handle);
spin_lock_irqsave(&ei->i_completed_io_lock, flags);
- if (io_end->handle) {
- wq = EXT4_SB(io_end->inode->i_sb)->rsv_conversion_wq;
- if (list_empty(&ei->i_rsv_conversion_list))
- queue_work(wq, &ei->i_rsv_conversion_work);
- list_add_tail(&io_end->list, &ei->i_rsv_conversion_list);
- } else {
- wq = EXT4_SB(io_end->inode->i_sb)->unrsv_conversion_wq;
- if (list_empty(&ei->i_unrsv_conversion_list))
- queue_work(wq, &ei->i_unrsv_conversion_work);
- list_add_tail(&io_end->list, &ei->i_unrsv_conversion_list);
- }
+ wq = EXT4_SB(io_end->inode->i_sb)->rsv_conversion_wq;
+ if (list_empty(&ei->i_rsv_conversion_list))
+ queue_work(wq, &ei->i_rsv_conversion_work);
+ list_add_tail(&io_end->list, &ei->i_rsv_conversion_list);
spin_unlock_irqrestore(&ei->i_completed_io_lock, flags);
}
@@ -255,13 +246,6 @@ void ext4_end_io_rsv_work(struct work_struct *work)
ext4_do_flush_completed_IO(&ei->vfs_inode, &ei->i_rsv_conversion_list);
}
-void ext4_end_io_unrsv_work(struct work_struct *work)
-{
- struct ext4_inode_info *ei = container_of(work, struct ext4_inode_info,
- i_unrsv_conversion_work);
- ext4_do_flush_completed_IO(&ei->vfs_inode, &ei->i_unrsv_conversion_list);
-}
-
ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags)
{
ext4_io_end_t *io = kmem_cache_zalloc(io_end_cachep, flags);
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 85b3dd6..5ab89a0 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -762,9 +762,7 @@ static void ext4_put_super(struct super_block *sb)
ext4_unregister_li_request(sb);
dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
- flush_workqueue(sbi->unrsv_conversion_wq);
flush_workqueue(sbi->rsv_conversion_wq);
- destroy_workqueue(sbi->unrsv_conversion_wq);
destroy_workqueue(sbi->rsv_conversion_wq);
if (sbi->s_journal) {
@@ -875,14 +873,12 @@ static struct inode *ext4_alloc_inode(struct super_block *sb)
#endif
ei->jinode = NULL;
INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
- INIT_LIST_HEAD(&ei->i_unrsv_conversion_list);
spin_lock_init(&ei->i_completed_io_lock);
ei->i_sync_tid = 0;
ei->i_datasync_tid = 0;
atomic_set(&ei->i_ioend_count, 0);
atomic_set(&ei->i_unwritten, 0);
INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
- INIT_WORK(&ei->i_unrsv_conversion_work, ext4_end_io_unrsv_work);
return &ei->vfs_inode;
}
@@ -3960,14 +3956,6 @@ no_journal:
goto failed_mount4;
}
- EXT4_SB(sb)->unrsv_conversion_wq =
- alloc_workqueue("ext4-unrsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
- if (!EXT4_SB(sb)->unrsv_conversion_wq) {
- printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
- ret = -ENOMEM;
- goto failed_mount4;
- }
-
/*
* The jbd2_journal_load will have done any necessary log recovery,
* so we can safely mount the rest of the filesystem now.
@@ -4121,8 +4109,6 @@ failed_mount4:
ext4_msg(sb, KERN_ERR, "mount failed");
if (EXT4_SB(sb)->rsv_conversion_wq)
destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
- if (EXT4_SB(sb)->unrsv_conversion_wq)
- destroy_workqueue(EXT4_SB(sb)->unrsv_conversion_wq);
failed_mount_wq:
if (sbi->s_journal) {
jbd2_journal_destroy(sbi->s_journal);
@@ -4570,7 +4556,6 @@ static int ext4_sync_fs(struct super_block *sb, int wait)
trace_ext4_sync_fs(sb, wait);
flush_workqueue(sbi->rsv_conversion_wq);
- flush_workqueue(sbi->unrsv_conversion_wq);
/*
* Writeback quota in non-journalled quota case - journalled quota has
* no dirty dquots
@@ -4606,7 +4591,6 @@ static int ext4_sync_fs_nojournal(struct super_block *sb, int wait)
trace_ext4_sync_fs(sb, wait);
flush_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
- flush_workqueue(EXT4_SB(sb)->unrsv_conversion_wq);
dquot_writeback_dquots(sb, -1);
if (wait && test_opt(sb, BARRIER))
ret = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index 79736a2..a533593 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -565,9 +565,7 @@ bail:
static void ocfs2_dio_end_io(struct kiocb *iocb,
loff_t offset,
ssize_t bytes,
- void *private,
- int ret,
- bool is_async)
+ void *private)
{
struct inode *inode = file_inode(iocb->ki_filp);
int level;
@@ -592,10 +590,6 @@ static void ocfs2_dio_end_io(struct kiocb *iocb,
level = ocfs2_iocb_rw_locked_level(iocb);
ocfs2_rw_unlock(inode, level);
-
- inode_dio_done(inode);
- if (is_async)
- aio_complete(iocb, ret, 0);
}
/*
diff --git a/fs/super.c b/fs/super.c
index 7465d43..4992012 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -152,15 +152,21 @@ static struct super_block *alloc_super(struct file_system_type *type, int flags)
static const struct super_operations default_op;
if (s) {
- if (security_sb_alloc(s)) {
- /*
- * We cannot call security_sb_free() without
- * security_sb_alloc() succeeding. So bail out manually
- */
- kfree(s);
- s = NULL;
- goto out;
+ /*
+ * Alloc workqueue only for filesystems that need it. This also
+ * avoids problems with pseudo filesystems which get initialized
+ * before workqueues can be created
+ */
+ if (type->fs_flags & FS_REQUIRES_DEV) {
+ s->s_dio_done_wq =
+ alloc_workqueue("dio-sync", WQ_UNBOUND, 1);
+ if (!s->s_dio_done_wq)
+ goto out_free_sb;
}
+
+ if (security_sb_alloc(s))
+ goto out_destroy_wq;
+
#ifdef CONFIG_SMP
s->s_files = alloc_percpu(struct list_head);
if (!s->s_files)
@@ -228,6 +234,10 @@ err_out:
free_percpu(s->s_files);
#endif
destroy_sb_writers(s);
+out_destroy_wq:
+ if (s->s_dio_done_wq)
+ destroy_workqueue(s->s_dio_done_wq);
+out_free_sb:
kfree(s);
s = NULL;
goto out;
@@ -244,6 +254,8 @@ static inline void destroy_super(struct super_block *s)
#ifdef CONFIG_SMP
free_percpu(s->s_files);
#endif
+ if (s->s_dio_done_wq)
+ destroy_workqueue(s->s_dio_done_wq);
destroy_sb_writers(s);
security_sb_free(s);
WARN_ON(!list_empty(&s->s_mounts));
diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index 596ec71..e11d654 100644
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -86,14 +86,6 @@ xfs_destroy_ioend(
bh->b_end_io(bh, !ioend->io_error);
}
- if (ioend->io_iocb) {
- inode_dio_done(ioend->io_inode);
- if (ioend->io_isasync) {
- aio_complete(ioend->io_iocb, ioend->io_error ?
- ioend->io_error : ioend->io_result, 0);
- }
- }
-
mempool_free(ioend, xfs_ioend_pool);
}
@@ -281,7 +273,6 @@ xfs_alloc_ioend(
* all the I/O from calling the completion routine too early.
*/
atomic_set(&ioend->io_remaining, 1);
- ioend->io_isasync = 0;
ioend->io_isdirect = 0;
ioend->io_error = 0;
ioend->io_list = NULL;
@@ -291,8 +282,6 @@ xfs_alloc_ioend(
ioend->io_buffer_tail = NULL;
ioend->io_offset = 0;
ioend->io_size = 0;
- ioend->io_iocb = NULL;
- ioend->io_result = 0;
ioend->io_append_trans = NULL;
INIT_WORK(&ioend->io_work, xfs_end_io);
@@ -1292,8 +1281,10 @@ __xfs_get_blocks(
if (create || !ISUNWRITTEN(&imap))
xfs_map_buffer(inode, bh_result, &imap, offset);
if (create && ISUNWRITTEN(&imap)) {
- if (direct)
+ if (direct) {
bh_result->b_private = inode;
+ set_buffer_defer_completion(bh_result);
+ }
set_buffer_unwritten(bh_result);
}
}
@@ -1390,9 +1381,7 @@ xfs_end_io_direct_write(
struct kiocb *iocb,
loff_t offset,
ssize_t size,
- void *private,
- int ret,
- bool is_async)
+ void *private)
{
struct xfs_ioend *ioend = iocb->private;
@@ -1414,17 +1403,10 @@ xfs_end_io_direct_write(
ioend->io_offset = offset;
ioend->io_size = size;
- ioend->io_iocb = iocb;
- ioend->io_result = ret;
if (private && size > 0)
ioend->io_type = XFS_IO_UNWRITTEN;
- if (is_async) {
- ioend->io_isasync = 1;
- xfs_finish_ioend(ioend);
- } else {
- xfs_finish_ioend_sync(ioend);
- }
+ xfs_finish_ioend_sync(ioend);
}
STATIC ssize_t
diff --git a/fs/xfs/xfs_aops.h b/fs/xfs/xfs_aops.h
index c325abb..f94dd45 100644
--- a/fs/xfs/xfs_aops.h
+++ b/fs/xfs/xfs_aops.h
@@ -45,7 +45,6 @@ typedef struct xfs_ioend {
unsigned int io_type; /* delalloc / unwritten */
int io_error; /* I/O error code */
atomic_t io_remaining; /* hold count */
- unsigned int io_isasync : 1; /* needs aio_complete */
unsigned int io_isdirect : 1;/* direct I/O */
struct inode *io_inode; /* file being written to */
struct buffer_head *io_buffer_head;/* buffer linked list head */
@@ -54,8 +53,6 @@ typedef struct xfs_ioend {
xfs_off_t io_offset; /* offset in the file */
struct work_struct io_work; /* xfsdatad work queue */
struct xfs_trans *io_append_trans;/* xact. for size update */
- struct kiocb *io_iocb;
- int io_result;
} xfs_ioend_t;
extern const struct address_space_operations xfs_address_space_operations;
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
index 91fa9a9..d77797a 100644
--- a/include/linux/buffer_head.h
+++ b/include/linux/buffer_head.h
@@ -36,6 +36,7 @@ enum bh_state_bits {
BH_Quiet, /* Buffer Error Prinks to be quiet */
BH_Meta, /* Buffer contains metadata */
BH_Prio, /* Buffer should be submitted with REQ_PRIO */
+ BH_Defer_Completion, /* Defer AIO completion to workqueue */
BH_PrivateStart,/* not a state bit, but the first bit available
* for private allocation by other entities
@@ -128,6 +129,7 @@ BUFFER_FNS(Write_EIO, write_io_error)
BUFFER_FNS(Unwritten, unwritten)
BUFFER_FNS(Meta, meta)
BUFFER_FNS(Prio, prio)
+BUFFER_FNS(Defer_Completion, defer_completion)
#define bh_offset(bh) ((unsigned long)(bh)->b_data & ~PAGE_MASK)
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 99be011..5b3fa72 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -45,6 +45,7 @@ struct vfsmount;
struct cred;
struct swap_info_struct;
struct seq_file;
+struct workqueue_struct;
extern void __init inode_init(void);
extern void __init inode_init_early(void);
@@ -62,8 +63,7 @@ struct buffer_head;
typedef int (get_block_t)(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create);
typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
- ssize_t bytes, void *private, int ret,
- bool is_async);
+ ssize_t bytes, void *private);
#define MAY_EXEC 0x00000001
#define MAY_WRITE 0x00000002
@@ -1325,6 +1325,9 @@ struct super_block {
/* Being remounted read-only */
int s_readonly_remount;
+
+ /* AIO completions deferred from interrupt context */
+ struct workqueue_struct *s_dio_done_wq;
};
/* superblock cache pruning functions */
--
1.8.1.4
--
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