[PATCH 08/10] iomap: pass a flags argument to iomap_dio_rw

Christoph Hellwig
2021-01-12T16:30:20Z

Pass a set of flags to iomap_dio_rw instead of the boolean
wait_for_completion argument. The IOMAP_DIO_FORCE_WAIT flag
replaces the wait_for_completion, but only needs to be passed
when the iocb isn't synchronous to start with to simplify the
callers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
fs/btrfs/file.c | 7 +++----
fs/ext4/file.c | 5 ++---
fs/gfs2/file.c | 7 ++-----
fs/iomap/direct-io.c | 19 ++++++++++---------
fs/xfs/xfs_file.c | 7 +++----
fs/zonefs/super.c | 4 ++--
include/linux/iomap.h | 6 ++++--
7 files changed, 26 insertions(+), 29 deletions(-)

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 0e41459b8de667..ddfd2e2adedf58 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1949,8 +1949,8 @@ static ssize_t btrfs_direct_write(struct kiocb *iocb, struct iov_iter *from)
goto buffered;
}

- dio = __iomap_dio_rw(iocb, from, &btrfs_dio_iomap_ops,
- &btrfs_dio_ops, is_sync_kiocb(iocb));
+ dio = __iomap_dio_rw(iocb, from, &btrfs_dio_iomap_ops, &btrfs_dio_ops,
+ 0);

btrfs_inode_unlock(inode, ilock_flags);

@@ -3622,8 +3622,7 @@ static ssize_t btrfs_direct_read(struct kiocb *iocb, struct iov_iter *to)
return 0;

btrfs_inode_lock(inode, BTRFS_ILOCK_SHARED);
- ret = iomap_dio_rw(iocb, to, &btrfs_dio_iomap_ops, &btrfs_dio_ops,
- is_sync_kiocb(iocb));
+ ret = iomap_dio_rw(iocb, to, &btrfs_dio_iomap_ops, &btrfs_dio_ops, 0);
btrfs_inode_unlock(inode, BTRFS_ILOCK_SHARED);
return ret;
}
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 3ed8c048fb12c5..5d93495bfc6224 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -74,8 +74,7 @@ static ssize_t ext4_dio_read_iter(struct kiocb *iocb, struct iov_iter *to)
return generic_file_read_iter(iocb, to);
}

- ret = iomap_dio_rw(iocb, to, &ext4_iomap_ops, NULL,
- is_sync_kiocb(iocb));
+ ret = iomap_dio_rw(iocb, to, &ext4_iomap_ops, NULL, 0);
inode_unlock_shared(inode);

file_accessed(iocb->ki_filp);
@@ -550,7 +549,7 @@ static ssize_t ext4_dio_write_iter(struct kiocb *iocb, struct iov_iter *from)
if (ilock_shared)
iomap_ops = &ext4_iomap_overwrite_ops;
ret = iomap_dio_rw(iocb, from, iomap_ops, &ext4_dio_write_ops,
- is_sync_kiocb(iocb) || unaligned_io || extend);
+ (unaligned_io || extend) ? IOMAP_DIO_FORCE_WAIT : 0);
if (ret == -ENOTBLK)
ret = 0;

diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index b39b339feddc93..89609c2997177a 100644
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -797,9 +797,7 @@ static ssize_t gfs2_file_direct_read(struct kiocb *iocb, struct iov_iter *to,
if (ret)
goto out_uninit;

- ret = iomap_dio_rw(iocb, to, &gfs2_iomap_ops, NULL,
- is_sync_kiocb(iocb));
-
+ ret = iomap_dio_rw(iocb, to, &gfs2_iomap_ops, NULL, 0);
gfs2_glock_dq(gh);
out_uninit:
gfs2_holder_uninit(gh);
@@ -833,8 +831,7 @@ static ssize_t gfs2_file_direct_write(struct kiocb *iocb, struct iov_iter *from,
if (offset + len > i_size_read(&ip->i_inode))
goto out;

- ret = iomap_dio_rw(iocb, from, &gfs2_iomap_ops, NULL,
- is_sync_kiocb(iocb));
+ ret = iomap_dio_rw(iocb, from, &gfs2_iomap_ops, NULL, 0);
if (ret == -ENOTBLK)
ret = 0;
out:
diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c
index 933f234d5becd0..96dc72debc4b79 100644
--- a/fs/iomap/direct-io.c
+++ b/fs/iomap/direct-io.c
@@ -420,7 +420,7 @@ iomap_dio_actor(struct inode *inode, loff_t pos, loff_t length,
struct iomap_dio *
__iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
const struct iomap_ops *ops, const struct iomap_dio_ops *dops,
- bool wait_for_completion)
+ unsigned int dio_flags)
{
struct address_space *mapping = iocb->ki_filp->f_mapping;
struct inode *inode = file_inode(iocb->ki_filp);
@@ -434,8 +434,8 @@ __iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
if (!count)
return NULL;

- if (WARN_ON(is_sync_kiocb(iocb) && !wait_for_completion))
- return ERR_PTR(-EIO);
+ if (is_sync_kiocb(iocb))
+ dio_flags |= IOMAP_DIO_FORCE_WAIT;

dio = kmalloc(sizeof(*dio), GFP_KERNEL);
if (!dio)
@@ -503,7 +503,8 @@ __iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
goto out_free_dio;
}

- if (!wait_for_completion && !inode->i_sb->s_dio_done_wq) {
+ if (!(dio_flags & IOMAP_DIO_FORCE_WAIT) &&
+ !inode->i_sb->s_dio_done_wq) {
ret = sb_init_dio_done_wq(inode->i_sb);
if (ret < 0)
goto out_free_dio;
@@ -519,7 +520,7 @@ __iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
if (ret <= 0) {
/* magic error code to fall back to buffered I/O */
if (ret == -ENOTBLK) {
- wait_for_completion = true;
+ dio_flags |= IOMAP_DIO_FORCE_WAIT;
ret = 0;
}
break;
@@ -566,9 +567,9 @@ __iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
* of the final reference, and we will complete and free it here
* after we got woken by the I/O completion handler.
*/
- dio->wait_for_completion = wait_for_completion;
+ dio->wait_for_completion = dio_flags & IOMAP_DIO_FORCE_WAIT;
if (!atomic_dec_and_test(&dio->ref)) {
- if (!wait_for_completion)
+ if (!(dio_flags & IOMAP_DIO_FORCE_WAIT))
return ERR_PTR(-EIOCBQUEUED);

for (;;) {
@@ -598,11 +599,11 @@ EXPORT_SYMBOL_GPL(__iomap_dio_rw);
ssize_t
iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
const struct iomap_ops *ops, const struct iomap_dio_ops *dops,
- bool wait_for_completion)
+ unsigned int flags)
{
struct iomap_dio *dio;

- dio = __iomap_dio_rw(iocb, iter, ops, dops, wait_for_completion);
+ dio = __iomap_dio_rw(iocb, iter, ops, dops, flags);
if (IS_ERR_OR_NULL(dio))
return PTR_ERR_OR_ZERO(dio);
return iomap_dio_complete(dio);
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index bffd7240cefb7f..b181db42f2f32f 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -232,8 +232,7 @@ xfs_file_dio_read(
ret = xfs_ilock_iocb(iocb, XFS_IOLOCK_SHARED);
if (ret)
return ret;
- ret = iomap_dio_rw(iocb, to, &xfs_read_iomap_ops, NULL,
- is_sync_kiocb(iocb));
+ ret = iomap_dio_rw(iocb, to, &xfs_read_iomap_ops, NULL, 0);
xfs_iunlock(ip, XFS_IOLOCK_SHARED);

return ret;
@@ -535,7 +534,7 @@ xfs_file_dio_write_aligned(
}
trace_xfs_file_direct_write(iocb, from);
ret = iomap_dio_rw(iocb, from, &xfs_direct_write_iomap_ops,
- &xfs_dio_write_ops, is_sync_kiocb(iocb));
+ &xfs_dio_write_ops, 0);
out_unlock:
if (iolock)
xfs_iunlock(ip, iolock);
@@ -603,7 +602,7 @@ xfs_file_dio_write_unaligned(
*/
trace_xfs_file_direct_write(iocb, from);
ret = iomap_dio_rw(iocb, from, &xfs_direct_write_iomap_ops,
- &xfs_dio_write_ops, true);
+ &xfs_dio_write_ops, IOMAP_DIO_FORCE_WAIT);
out_unlock:
if (iolock)
xfs_iunlock(ip, iolock);
diff --git a/fs/zonefs/super.c b/fs/zonefs/super.c
index bec47f2d074beb..0e7ab0bc00ae8e 100644
--- a/fs/zonefs/super.c
+++ b/fs/zonefs/super.c
@@ -780,7 +780,7 @@ static ssize_t zonefs_file_dio_write(struct kiocb *iocb, struct iov_iter *from)
ret = zonefs_file_dio_append(iocb, from);
else
ret = iomap_dio_rw(iocb, from, &zonefs_iomap_ops,
- &zonefs_write_dio_ops, sync);
+ &zonefs_write_dio_ops, 0);
if (zi->i_ztype == ZONEFS_ZTYPE_SEQ &&
(ret > 0 || ret == -EIOCBQUEUED)) {
if (ret > 0)
@@ -917,7 +917,7 @@ static ssize_t zonefs_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
}
file_accessed(iocb->ki_filp);
ret = iomap_dio_rw(iocb, to, &zonefs_iomap_ops,
- &zonefs_read_dio_ops, is_sync_kiocb(iocb));
+ &zonefs_read_dio_ops, 0);
} else {
ret = generic_file_read_iter(iocb, to);
if (ret == -EIO)
diff --git a/include/linux/iomap.h b/include/linux/iomap.h
index 5bd3cac4df9cb4..e7865654dd0dca 100644
--- a/include/linux/iomap.h
+++ b/include/linux/iomap.h
@@ -256,12 +256,14 @@ struct iomap_dio_ops {
struct bio *bio, loff_t file_offset);
};

+#define IOMAP_DIO_FORCE_WAIT (1 << 0) /* force waiting for I/O */
+
ssize_t iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
const struct iomap_ops *ops, const struct iomap_dio_ops *dops,
- bool wait_for_completion);
+ unsigned int flags);
struct iomap_dio *__iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
const struct iomap_ops *ops, const struct iomap_dio_ops *dops,
- bool wait_for_completion);
+ unsigned int flags);
ssize_t iomap_dio_complete(struct iomap_dio *dio);
int iomap_dio_iopoll(struct kiocb *kiocb, bool spin);

--
2.29.2