From 187372a3b9faff68ed61c291d0135e6739e0dbdf Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Mon, 8 Feb 2016 14:40:51 +1100 Subject: [PATCH 1/4] direct-io: always call ->end_io if non-NULL 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 Reviewed-by: Dave Chinner Signed-off-by: Dave Chinner --- 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 4fd6b0c5c6b5..e38b2c589b54 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 1b2f7ffc8b84..9c6f885cc518 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 83bc8bfb3bea..9db04dd9b88a 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 794fd1587f34..5dcc5f5a842e 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 379c089fb051..295aaffea78e 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 1a2046275cdf..d7f37bfcbdce 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); From 273dda76f757108bc2b29d30a9595b6dd3bdf3a1 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Mon, 8 Feb 2016 14:40:51 +1100 Subject: [PATCH 2/4] xfs: don't use ioends for direct write completions We only need to communicate two bits of information to the direct I/O completion handler: (1) do we need to convert any unwritten extents in the range (2) do we need to check if we need to update the inode size based on the range passed to the completion handler We can use the private data passed to the get_block handler and the completion handler as a simple bitmask to communicate this information instead of the current complicated infrastructure reusing the ioends from the buffer I/O path, and thus avoiding a memory allocation and a context switch for any non-trivial direct write. As a nice side effect we also decouple the direct I/O path implementation from that of the buffered I/O path. Signed-off-by: Christoph Hellwig Reviewed-by: Brian Foster --- fs/xfs/xfs_aops.c | 220 +++++++++++++++------------------------------ fs/xfs/xfs_trace.h | 9 +- 2 files changed, 77 insertions(+), 152 deletions(-) diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c index 295aaffea78e..f008a4f9dcea 100644 --- a/fs/xfs/xfs_aops.c +++ b/fs/xfs/xfs_aops.c @@ -36,6 +36,10 @@ #include #include +/* flags for direct write completions */ +#define XFS_DIO_FLAG_UNWRITTEN (1 << 0) +#define XFS_DIO_FLAG_APPEND (1 << 1) + void xfs_count_page_state( struct page *page, @@ -1238,27 +1242,8 @@ xfs_vm_releasepage( } /* - * When we map a DIO buffer, we may need to attach an ioend that describes the - * type of write IO we are doing. This passes to the completion function the - * operations it needs to perform. If the mapping is for an overwrite wholly - * within the EOF then we don't need an ioend and so we don't allocate one. - * This avoids the unnecessary overhead of allocating and freeing ioends for - * workloads that don't require transactions on IO completion. - * - * If we get multiple mappings in a single IO, we might be mapping different - * types. But because the direct IO can only have a single private pointer, we - * need to ensure that: - * - * a) i) the ioend spans the entire region of unwritten mappings; or - * ii) the ioend spans all the mappings that cross or are beyond EOF; and - * b) if it contains unwritten extents, it is *permanently* marked as such - * - * We could do this by chaining ioends like buffered IO does, but we only - * actually get one IO completion callback from the direct IO, and that spans - * the entire IO regardless of how many mappings and IOs are needed to complete - * the DIO. There is only going to be one reference to the ioend and its life - * cycle is constrained by the DIO completion code. hence we don't need - * reference counting here. + * When we map a DIO buffer, we may need to pass flags to + * xfs_end_io_direct_write to tell it what kind of write IO we are doing. * * Note that for DIO, an IO to the highest supported file block offset (i.e. * 2^63 - 1FSB bytes) will result in the offset + count overflowing a signed 64 @@ -1266,68 +1251,26 @@ xfs_vm_releasepage( * extending the file size. We won't know for sure until IO completion is run * and the actual max write offset is communicated to the IO completion * routine. - * - * For DAX page faults, we are preparing to never see unwritten extents here, - * nor should we ever extend the inode size. Hence we will soon have nothing to - * do here for this case, ensuring we don't have to provide an IO completion - * callback to free an ioend that we don't actually need for a fault into the - * page at offset (2^63 - 1FSB) bytes. */ - static void xfs_map_direct( struct inode *inode, struct buffer_head *bh_result, struct xfs_bmbt_irec *imap, - xfs_off_t offset, - bool dax_fault) + xfs_off_t offset) { - struct xfs_ioend *ioend; + uintptr_t *flags = (uintptr_t *)&bh_result->b_private; xfs_off_t size = bh_result->b_size; - int type; - if (ISUNWRITTEN(imap)) - type = XFS_IO_UNWRITTEN; - else - type = XFS_IO_OVERWRITE; + trace_xfs_get_blocks_map_direct(XFS_I(inode), offset, size, + ISUNWRITTEN(imap) ? XFS_IO_UNWRITTEN : XFS_IO_OVERWRITE, imap); - trace_xfs_gbmap_direct(XFS_I(inode), offset, size, type, imap); - - if (dax_fault) { - ASSERT(type == XFS_IO_OVERWRITE); - trace_xfs_gbmap_direct_none(XFS_I(inode), offset, size, type, - imap); - return; - } - - if (bh_result->b_private) { - ioend = bh_result->b_private; - ASSERT(ioend->io_size > 0); - ASSERT(offset >= ioend->io_offset); - if (offset + size > ioend->io_offset + ioend->io_size) - ioend->io_size = offset - ioend->io_offset + size; - - if (type == XFS_IO_UNWRITTEN && type != ioend->io_type) - ioend->io_type = XFS_IO_UNWRITTEN; - - trace_xfs_gbmap_direct_update(XFS_I(inode), ioend->io_offset, - ioend->io_size, ioend->io_type, - imap); - } else if (type == XFS_IO_UNWRITTEN || - offset + size > i_size_read(inode) || - offset + size < 0) { - ioend = xfs_alloc_ioend(inode, type); - ioend->io_offset = offset; - ioend->io_size = size; - - bh_result->b_private = ioend; + if (ISUNWRITTEN(imap)) { + *flags |= XFS_DIO_FLAG_UNWRITTEN; + set_buffer_defer_completion(bh_result); + } else if (offset + size > i_size_read(inode) || offset + size < 0) { + *flags |= XFS_DIO_FLAG_APPEND; set_buffer_defer_completion(bh_result); - - trace_xfs_gbmap_direct_new(XFS_I(inode), offset, size, type, - imap); - } else { - trace_xfs_gbmap_direct_none(XFS_I(inode), offset, size, type, - imap); } } @@ -1498,9 +1441,12 @@ __xfs_get_blocks( if (ISUNWRITTEN(&imap)) set_buffer_unwritten(bh_result); /* direct IO needs special help */ - if (create && direct) - xfs_map_direct(inode, bh_result, &imap, offset, - dax_fault); + if (create && direct) { + if (dax_fault) + ASSERT(!ISUNWRITTEN(&imap)); + else + xfs_map_direct(inode, bh_result, &imap, offset); + } } /* @@ -1570,42 +1516,50 @@ xfs_get_blocks_dax_fault( return __xfs_get_blocks(inode, iblock, bh_result, create, true, true); } -static void -__xfs_end_io_direct_write( - struct inode *inode, - struct xfs_ioend *ioend, +/* + * Complete a direct I/O write request. + * + * xfs_map_direct passes us some flags in the private data to tell us what to + * do. If no flags are set, then the write IO is an overwrite wholly within + * the existing allocated file size and so there is nothing for us to do. + * + * Note that in this case the completion can be called in interrupt context, + * whereas if we have flags set we will always be called in task context + * (i.e. from a workqueue). + */ +STATIC int +xfs_end_io_direct_write( + struct kiocb *iocb, loff_t offset, - ssize_t size) + ssize_t size, + void *private) { - struct xfs_mount *mp = XFS_I(inode)->i_mount; + struct inode *inode = file_inode(iocb->ki_filp); + struct xfs_inode *ip = XFS_I(inode); + struct xfs_mount *mp = ip->i_mount; + uintptr_t flags = (uintptr_t)private; + int error = 0; - if (XFS_FORCED_SHUTDOWN(mp) || ioend->io_error) - goto out_end_io; + trace_xfs_end_io_direct_write(ip, offset, size); + + if (XFS_FORCED_SHUTDOWN(mp)) + return -EIO; + + if (size <= 0) + return size; /* - * dio completion end_io functions are only called on writes if more - * than 0 bytes was written. - */ - ASSERT(size > 0); - - /* - * The ioend only maps whole blocks, while the IO may be sector aligned. - * Hence the ioend offset/size may not match the IO offset/size exactly. - * Because we don't map overwrites within EOF into the ioend, the offset - * may not match, but only if the endio spans EOF. Either way, write - * the IO sizes into the ioend so that completion processing does the - * right thing. - */ - ASSERT(offset + size <= ioend->io_offset + ioend->io_size); - ioend->io_size = size; - ioend->io_offset = offset; - - /* - * The ioend tells us whether we are doing unwritten extent conversion + * The flags tell us whether we are doing unwritten extent conversions * or an append transaction that updates the on-disk file size. These * cases are the only cases where we should *potentially* be needing * to update the VFS inode size. - * + */ + if (flags == 0) { + ASSERT(offset + size <= i_size_read(inode)); + return 0; + } + + /* * We need to update the in-core inode size here so that we don't end up * with the on-disk inode size being outside the in-core inode size. We * have no other method of updating EOF for AIO, so always do it here @@ -1616,58 +1570,30 @@ __xfs_end_io_direct_write( * here can result in EOF moving backwards and Bad Things Happen when * that occurs. */ - spin_lock(&XFS_I(inode)->i_flags_lock); + spin_lock(&ip->i_flags_lock); if (offset + size > i_size_read(inode)) i_size_write(inode, offset + size); - spin_unlock(&XFS_I(inode)->i_flags_lock); + spin_unlock(&ip->i_flags_lock); - /* - * If we are doing an append IO that needs to update the EOF on disk, - * do the transaction reserve now so we can use common end io - * processing. Stashing the error (if there is one) in the ioend will - * result in the ioend processing passing on the error if it is - * possible as we can't return it from here. - */ - if (ioend->io_type == XFS_IO_OVERWRITE) - ioend->io_error = xfs_setfilesize_trans_alloc(ioend); + if (flags & XFS_DIO_FLAG_UNWRITTEN) { + trace_xfs_end_io_direct_write_unwritten(ip, offset, size); -out_end_io: - xfs_end_io(&ioend->io_work); - return; -} + error = xfs_iomap_write_unwritten(ip, offset, size); + } else if (flags & XFS_DIO_FLAG_APPEND) { + struct xfs_trans *tp; -/* - * Complete a direct I/O write request. - * - * The ioend structure is passed from __xfs_get_blocks() to tell us what to do. - * If no ioend exists (i.e. @private == NULL) then the write IO is an overwrite - * wholly within the EOF and so there is nothing for us to do. Note that in this - * 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 int -xfs_end_io_direct_write( - struct kiocb *iocb, - loff_t offset, - ssize_t size, - void *private) -{ - struct inode *inode = file_inode(iocb->ki_filp); - struct xfs_ioend *ioend = private; + trace_xfs_end_io_direct_write_append(ip, offset, size); - 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 0; + tp = xfs_trans_alloc(mp, XFS_TRANS_FSYNC_TS); + error = xfs_trans_reserve(tp, &M_RES(mp)->tr_fsyncts, 0, 0); + if (error) { + xfs_trans_cancel(tp); + return error; + } + error = xfs_setfilesize(ip, tp, offset, size); } - __xfs_end_io_direct_write(inode, ioend, offset, size); - return 0; + return error; } static inline ssize_t diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h index 391d797cb53f..c8d58426008e 100644 --- a/fs/xfs/xfs_trace.h +++ b/fs/xfs/xfs_trace.h @@ -1296,11 +1296,7 @@ DEFINE_IOMAP_EVENT(xfs_map_blocks_found); DEFINE_IOMAP_EVENT(xfs_map_blocks_alloc); DEFINE_IOMAP_EVENT(xfs_get_blocks_found); DEFINE_IOMAP_EVENT(xfs_get_blocks_alloc); -DEFINE_IOMAP_EVENT(xfs_gbmap_direct); -DEFINE_IOMAP_EVENT(xfs_gbmap_direct_new); -DEFINE_IOMAP_EVENT(xfs_gbmap_direct_update); -DEFINE_IOMAP_EVENT(xfs_gbmap_direct_none); -DEFINE_IOMAP_EVENT(xfs_gbmap_direct_endio); +DEFINE_IOMAP_EVENT(xfs_get_blocks_map_direct); DECLARE_EVENT_CLASS(xfs_simple_io_class, TP_PROTO(struct xfs_inode *ip, xfs_off_t offset, ssize_t count), @@ -1340,6 +1336,9 @@ DEFINE_SIMPLE_IO_EVENT(xfs_unwritten_convert); DEFINE_SIMPLE_IO_EVENT(xfs_get_blocks_notfound); DEFINE_SIMPLE_IO_EVENT(xfs_setfilesize); DEFINE_SIMPLE_IO_EVENT(xfs_zero_eof); +DEFINE_SIMPLE_IO_EVENT(xfs_end_io_direct_write); +DEFINE_SIMPLE_IO_EVENT(xfs_end_io_direct_write_unwritten); +DEFINE_SIMPLE_IO_EVENT(xfs_end_io_direct_write_append); DECLARE_EVENT_CLASS(xfs_itrunc_class, TP_PROTO(struct xfs_inode *ip, xfs_fsize_t new_size), From c19b104a67b3bb1ac48275a8a1c9df666e676c25 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Mon, 8 Feb 2016 14:40:51 +1100 Subject: [PATCH 3/4] xfs: fold xfs_vm_do_dio into xfs_vm_direct_IO Signed-off-by: Christoph Hellwig Reviewed-by: Brian Foster Signed-off-by: Dave Chinner --- fs/xfs/xfs_aops.c | 40 ++++++++++++++++------------------------ 1 file changed, 16 insertions(+), 24 deletions(-) diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c index f008a4f9dcea..8163910bc49f 100644 --- a/fs/xfs/xfs_aops.c +++ b/fs/xfs/xfs_aops.c @@ -1596,26 +1596,6 @@ xfs_end_io_direct_write( return error; } -static inline ssize_t -xfs_vm_do_dio( - struct inode *inode, - struct kiocb *iocb, - struct iov_iter *iter, - loff_t offset, - dio_iodone_t endio, - int flags) -{ - struct block_device *bdev; - - if (IS_DAX(inode)) - return dax_do_io(iocb, inode, iter, offset, - xfs_get_blocks_direct, endio, 0); - - bdev = xfs_find_bdev_for_inode(inode); - return __blockdev_direct_IO(iocb, inode, bdev, iter, offset, - xfs_get_blocks_direct, endio, NULL, flags); -} - STATIC ssize_t xfs_vm_direct_IO( struct kiocb *iocb, @@ -1623,11 +1603,23 @@ xfs_vm_direct_IO( loff_t offset) { struct inode *inode = iocb->ki_filp->f_mapping->host; + dio_iodone_t *endio = NULL; + int flags = 0; + struct block_device *bdev; - if (iov_iter_rw(iter) == WRITE) - return xfs_vm_do_dio(inode, iocb, iter, offset, - xfs_end_io_direct_write, DIO_ASYNC_EXTEND); - return xfs_vm_do_dio(inode, iocb, iter, offset, NULL, 0); + if (iov_iter_rw(iter) == WRITE) { + endio = xfs_end_io_direct_write; + flags = DIO_ASYNC_EXTEND; + } + + if (IS_DAX(inode)) { + return dax_do_io(iocb, inode, iter, offset, + xfs_get_blocks_direct, endio, 0); + } + + bdev = xfs_find_bdev_for_inode(inode); + return __blockdev_direct_IO(iocb, inode, bdev, iter, offset, + xfs_get_blocks_direct, endio, NULL, flags); } /* From 74c66bcb7eda551f3b8588659c58fe29184af903 Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Mon, 29 Feb 2016 08:36:38 +1100 Subject: [PATCH 4/4] ext4: Fix data exposure after failed AIO DIO When AIO DIO fails e.g. due to IO error, we must not convert unwritten extents as that will expose uninitialized data. Handle this case by clearing unwritten flag from io_end in case of error and thus preventing extent conversion. Signed-off-by: Jan Kara Reviewed-by: Darrick J. Wong Reviewed-by: Christoph Hellwig Signed-off-by: Dave Chinner --- fs/ext4/ext4.h | 30 +++++++++++++++++++++--------- fs/ext4/inode.c | 21 ++++++++------------- fs/ext4/page-io.c | 10 ---------- 3 files changed, 29 insertions(+), 32 deletions(-) diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 0662b285dc8a..56c12df107ab 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -1504,15 +1504,6 @@ static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); } -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)) { - io_end->flag |= EXT4_IO_END_UNWRITTEN; - atomic_inc(&EXT4_I(inode)->i_unwritten); - } -} - static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode) { return inode->i_private; @@ -3293,6 +3284,27 @@ extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ]; extern int ext4_resize_begin(struct super_block *sb); extern void ext4_resize_end(struct super_block *sb); +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)) { + io_end->flag |= EXT4_IO_END_UNWRITTEN; + atomic_inc(&EXT4_I(inode)->i_unwritten); + } +} + +static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) +{ + struct inode *inode = io_end->inode; + + if (io_end->flag & EXT4_IO_END_UNWRITTEN) { + io_end->flag &= ~EXT4_IO_END_UNWRITTEN; + /* Wake up anyone waiting on unwritten extent conversion */ + if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) + wake_up_all(ext4_ioend_wq(inode)); + } +} + #endif /* __KERNEL__ */ #define EFSBADCRC EBADMSG /* Bad CRC detected */ diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 9db04dd9b88a..2b98171a9432 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -3166,9 +3166,6 @@ static int ext4_end_io_dio(struct kiocb *iocb, loff_t offset, { ext4_io_end_t *io_end = iocb->private; - if (size <= 0) - return 0; - /* if not async direct IO just return */ if (!io_end) return 0; @@ -3179,6 +3176,14 @@ static int ext4_end_io_dio(struct kiocb *iocb, loff_t offset, size); iocb->private = NULL; + /* + * Error during AIO DIO. We cannot convert unwritten extents as the + * data was not written. Just clear the unwritten flag and drop io_end. + */ + if (size <= 0) { + ext4_clear_io_unwritten_flag(io_end); + size = 0; + } io_end->offset = offset; io_end->size = size; ext4_put_io_end(io_end); @@ -3306,16 +3311,6 @@ static ssize_t ext4_ext_direct_IO(struct kiocb *iocb, struct iov_iter *iter, if (io_end) { ext4_inode_aio_set(inode, NULL); ext4_put_io_end(io_end); - /* - * When no IO was submitted ext4_end_io_dio() was not - * called so we have to put iocb's reference. - */ - if (ret <= 0 && ret != -EIOCBQUEUED && iocb->private) { - WARN_ON(iocb->private != io_end); - WARN_ON(io_end->flag & EXT4_IO_END_UNWRITTEN); - ext4_put_io_end(io_end); - iocb->private = NULL; - } } if (ret > 0 && !overwrite && ext4_test_inode_state(inode, EXT4_STATE_DIO_UNWRITTEN)) { diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c index 090b3498638e..f49a87c4fb63 100644 --- a/fs/ext4/page-io.c +++ b/fs/ext4/page-io.c @@ -139,16 +139,6 @@ static void ext4_release_io_end(ext4_io_end_t *io_end) kmem_cache_free(io_end_cachep, io_end); } -static void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) -{ - struct inode *inode = io_end->inode; - - io_end->flag &= ~EXT4_IO_END_UNWRITTEN; - /* Wake up anyone waiting on unwritten extent conversion */ - if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) - wake_up_all(ext4_ioend_wq(inode)); -} - /* * Check a range of space and convert unwritten extents to written. Note that * we are protected from truncate touching same part of extent tree by the