>From 1411960edc40abe5db5344fed04bf6370dc432e8 Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Wed, 16 Oct 2013 20:32:58 +0200 Subject: [PATCH] ext4: Debug outstanding io_ends Signed-off-by: Jan Kara --- fs/ext4/ext4.h | 3 +++ fs/ext4/inode.c | 24 ++++++++++++++++++++++-- fs/ext4/page-io.c | 11 +++++++++++ 3 files changed, 36 insertions(+), 2 deletions(-) diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index af815ea9d7cc..82333b4ba7bf 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -187,6 +187,7 @@ struct ext4_map_blocks { */ typedef struct ext4_io_end { struct list_head list; /* per-file finished IO list */ + struct list_head full_list; handle_t *handle; /* handle reserved for extent * conversion */ struct inode *inode; /* file being written to */ @@ -196,6 +197,7 @@ typedef struct ext4_io_end { loff_t offset; /* offset in the file */ ssize_t size; /* size of the extent */ atomic_t count; /* reference counter */ + unsigned long created_at; } ext4_io_end_t; struct ext4_io_submit { @@ -907,6 +909,7 @@ struct ext4_inode_info { * transaction reserved */ struct list_head i_rsv_conversion_list; + struct list_head i_ioend_list; /* * Completed IOs that need unwritten extents handling and don't have * transaction reserved diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index e7e5b3d8f002..c053e977caa1 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -176,6 +176,20 @@ int ext4_truncate_restart_trans(handle_t *handle, struct inode *inode, return ret; } +static void dump_ioends(struct inode *inode, struct list_head *head) +{ + ext4_io_end_t *io; + unsigned long flags; + + spin_lock_irqsave(&EXT4_I(inode)->i_completed_io_lock, flags); + list_for_each_entry(io, head, full_list) { + printk("ioend %p, created at 0x%lx: handle=%p, bio=%p, flag=%u, offset=%lu, len=%u, count=%d\n", + io, io->created_at, io->handle, io->bio, io->flag, (unsigned long)io->offset, + (unsigned)io->size, (int)atomic_read(&io->count)); + } + spin_unlock_irqrestore(&EXT4_I(inode)->i_completed_io_lock, flags); +} + /* * Called at the last iput() if i_nlink is zero. */ @@ -216,7 +230,10 @@ void ext4_evict_inode(struct inode *inode) } truncate_inode_pages(&inode->i_data, 0); - WARN_ON(atomic_read(&EXT4_I(inode)->i_ioend_count)); + if (WARN_ON(atomic_read(&EXT4_I(inode)->i_ioend_count))) { + printk("ioend_count=%d, i_unwritten=%d\n", (int)atomic_read(&EXT4_I(inode)->i_ioend_count), (int)atomic_read(&EXT4_I(inode)->i_unwritten)); + dump_ioends(inode, &EXT4_I(inode)->i_ioend_list); + } goto no_delete; } @@ -227,7 +244,10 @@ void ext4_evict_inode(struct inode *inode) ext4_begin_ordered_truncate(inode, 0); truncate_inode_pages(&inode->i_data, 0); - WARN_ON(atomic_read(&EXT4_I(inode)->i_ioend_count)); + if (WARN_ON(atomic_read(&EXT4_I(inode)->i_ioend_count))) { + printk("ioend_count=%d, i_unwritten=%d\n", (int)atomic_read(&EXT4_I(inode)->i_ioend_count), (int)atomic_read(&EXT4_I(inode)->i_unwritten)); + dump_ioends(inode, &EXT4_I(inode)->i_ioend_list); + } if (is_bad_inode(inode)) goto no_delete; diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c index d488f80ee32d..8cce9abf9d31 100644 --- a/fs/ext4/page-io.c +++ b/fs/ext4/page-io.c @@ -110,6 +110,7 @@ static void ext4_finish_bio(struct bio *bio) static void ext4_release_io_end(ext4_io_end_t *io_end) { struct bio *bio, *next_bio; + unsigned long flags; BUG_ON(!list_empty(&io_end->list)); BUG_ON(io_end->flag & EXT4_IO_END_UNWRITTEN); @@ -118,6 +119,10 @@ static void ext4_release_io_end(ext4_io_end_t *io_end) if (atomic_dec_and_test(&EXT4_I(io_end->inode)->i_ioend_count)) wake_up_all(ext4_ioend_wq(io_end->inode)); + spin_lock_irqsave(&EXT4_I(io_end->inode)->i_completed_io_lock, flags); + list_del(&io_end->full_list); + spin_unlock_irqrestore(&EXT4_I(io_end->inode)->i_completed_io_lock, flags); + for (bio = io_end->bio; bio; bio = next_bio) { next_bio = bio->bi_private; ext4_finish_bio(bio); @@ -252,10 +257,16 @@ 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); if (io) { + unsigned long flags; + + spin_lock_irqsave(&EXT4_I(inode)->i_completed_io_lock, flags); + list_add(&io->full_list, &EXT4_I(inode)->i_ioend_list); + spin_unlock_irqrestore(&EXT4_I(inode)->i_completed_io_lock, flags); atomic_inc(&EXT4_I(inode)->i_ioend_count); io->inode = inode; INIT_LIST_HEAD(&io->list); atomic_set(&io->count, 1); + io->created_at = _RET_IP_; } return io; } -- 1.8.1.4