[PATCH 1/3] direct-io: always call ->end_io if non-NULL
From: Christoph Hellwig <hch@lst.de>
Date: 2016-02-03 18:40:21
Also in:
linux-fsdevel, linux-xfs, ocfs2-devel
Subsystem:
ext4 file system, filesystem direct access (dax), filesystems (vfs and infrastructure), oracle cluster filesystem 2 (ocfs2), the rest, xfs filesystem · Maintainers:
"Theodore Ts'o", Dan Williams, Alexander Viro, Christian Brauner, Mark Fasheh, Joel Becker, Joseph Qi, Linus Torvalds, Carlos Maiolino
See http://www.infradead.org/rpr.html This way we can pass back errors to the file system, and allow for cleanup required for all direct I/O invocations. Also allow the ->end_io handlers to return errors on their own, so that I/O completion errors can be passed on to the callers. Signed-off-by: Christoph Hellwig <hch@lst.de> --- fs/dax.c | 9 +++++++-- fs/direct-io.c | 9 +++++++-- fs/ext4/inode.c | 9 +++++++-- fs/ocfs2/aops.c | 7 ++++++- fs/xfs/xfs_aops.c | 13 +++++++------ include/linux/fs.h | 2 +- 6 files changed, 35 insertions(+), 14 deletions(-)
diff --git a/fs/dax.c b/fs/dax.c
index 4fd6b0c..e38b2c5 100644
--- a/fs/dax.c
+++ b/fs/dax.c@@ -267,8 +267,13 @@ ssize_t dax_do_io(struct kiocb *iocb, struct inode *inode, if ((flags & DIO_LOCKING) && iov_iter_rw(iter) == READ) inode_unlock(inode); - if ((retval > 0) && end_io) - end_io(iocb, pos, retval, bh.b_private); + if (end_io) { + int err; + + err = end_io(iocb, pos, retval, bh.b_private); + if (err) + retval = err; + } if (!(flags & DIO_SKIP_DIO_COUNT)) inode_dio_end(inode);
diff --git a/fs/direct-io.c b/fs/direct-io.c
index 1b2f7ff..9c6f885 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c@@ -253,8 +253,13 @@ static ssize_t dio_complete(struct dio *dio, loff_t offset, ssize_t ret, if (ret == 0) ret = transferred; - if (dio->end_io && dio->result) - dio->end_io(dio->iocb, offset, transferred, dio->private); + if (dio->end_io) { + int err; + + err = dio->end_io(dio->iocb, offset, ret, dio->private); + if (err) + ret = err; + } if (!(dio->flags & DIO_SKIP_DIO_COUNT)) inode_dio_end(dio->inode);
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 83bc8bf..9db04dd 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c@@ -3161,14 +3161,17 @@ out: } #endif -static void ext4_end_io_dio(struct kiocb *iocb, loff_t offset, +static int ext4_end_io_dio(struct kiocb *iocb, loff_t offset, ssize_t size, void *private) { ext4_io_end_t *io_end = iocb->private; + if (size <= 0) + return 0; + /* if not async direct IO just return */ if (!io_end) - return; + return 0; ext_debug("ext4_end_io_dio(): io_end 0x%p " "for inode %lu, iocb 0x%p, offset %llu, size %zd\n",
@@ -3179,6 +3182,8 @@ static void ext4_end_io_dio(struct kiocb *iocb, loff_t offset, io_end->offset = offset; io_end->size = size; ext4_put_io_end(io_end); + + return 0; } /*
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index 794fd15..5dcc5f5 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c@@ -620,7 +620,7 @@ bail: * particularly interested in the aio/dio case. We use the rw_lock DLM lock * to protect io on one node from truncation on another. */ -static void ocfs2_dio_end_io(struct kiocb *iocb, +static int ocfs2_dio_end_io(struct kiocb *iocb, loff_t offset, ssize_t bytes, void *private)
@@ -628,6 +628,9 @@ static void ocfs2_dio_end_io(struct kiocb *iocb, struct inode *inode = file_inode(iocb->ki_filp); int level; + if (bytes <= 0) + return 0; + /* this io's submitter should not have unlocked this before we could */ BUG_ON(!ocfs2_iocb_is_rw_locked(iocb));
@@ -644,6 +647,8 @@ static void ocfs2_dio_end_io(struct kiocb *iocb, level = ocfs2_iocb_rw_locked_level(iocb); ocfs2_rw_unlock(inode, level); } + + return 0; } static int ocfs2_releasepage(struct page *page, gfp_t wait)
diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index 379c089..295aaff 100644
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c@@ -1645,7 +1645,7 @@ out_end_io: * case the completion can be called in interrupt context, whereas if we have an * ioend we will always be called in task context (i.e. from a workqueue). */ -STATIC void +STATIC int xfs_end_io_direct_write( struct kiocb *iocb, loff_t offset,
@@ -1655,15 +1655,19 @@ xfs_end_io_direct_write( struct inode *inode = file_inode(iocb->ki_filp); struct xfs_ioend *ioend = private; + if (size <= 0) + return 0; + trace_xfs_gbmap_direct_endio(XFS_I(inode), offset, size, ioend ? ioend->io_type : 0, NULL); if (!ioend) { ASSERT(offset + size <= i_size_read(inode)); - return; + return 0; } __xfs_end_io_direct_write(inode, ioend, offset, size); + return 0; } static inline ssize_t
@@ -1672,10 +1676,7 @@ xfs_vm_do_dio( struct kiocb *iocb, struct iov_iter *iter, loff_t offset, - void (*endio)(struct kiocb *iocb, - loff_t offset, - ssize_t size, - void *private), + dio_iodone_t endio, int flags) { struct block_device *bdev;
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 1a20462..d7f37bf 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h@@ -70,7 +70,7 @@ extern int sysctl_protected_hardlinks; 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, +typedef int (dio_iodone_t)(struct kiocb *iocb, loff_t offset, ssize_t bytes, void *private); typedef void (dax_iodone_t)(struct buffer_head *bh_map, int uptodate);
--
2.1.4