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linux/fs/xfs
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Dave Chinner d69043c42d xfs: drop buffer io reference when a bad bio is built 
Error handling in xfs_buf_ioapply_map() does not handle IO reference
counts correctly. We increment the b_io_remaining count before
building the bio, but then fail to decrement it in the failure case.
This leads to the buffer never running IO completion and releasing
the reference that the IO holds, so at unmount we can leak the
buffer. This leak is captured by this assert failure during unmount:

XFS: Assertion failed: atomic_read(&pag->pag_ref) == 0, file: fs/xfs/xfs_mount.c, line: 273

This is not a new bug - the b_io_remaining accounting has had this
problem for a long, long time - it's just very hard to get a
zero length bio being built by this code...

Further, the buffer IO error can be overwritten on a multi-segment
buffer by subsequent bio completions for partial sections of the
buffer. Hence we should only set the buffer error status if the
buffer is not already carrying an error status. This ensures that a
partial IO error on a multi-segment buffer will not be lost. This
part of the problem is a regression, however.

cc: <stable@vger.kernel.org>
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
2012-11-17 09:36:57 -06:00
..
Kconfig
kmem.c xfs: switch to proper __bitwise type for KM_... flags 2012-05-29 23:28:32 -04:00
kmem.h xfs: switch to proper __bitwise type for KM_... flags 2012-05-29 23:28:32 -04:00
Makefile xfs: move xfs_do_force_shutdown() and kill xfs_rw.c 2012-05-14 16:20:59 -05:00
mrlock.h
time.h
uuid.c
uuid.h
xfs.h
xfs_acl.c userns: Pass a userns parameter into posix_acl_to_xattr and posix_acl_from_xattr 2012-09-18 01:01:35 -07:00
xfs_acl.h
xfs_ag.h xfs: move busy extent handling to it's own file 2012-05-14 16:20:55 -05:00
xfs_alloc.c xfs: move allocation stack switch up to xfs_bmapi_allocate 2012-11-08 11:08:46 -06:00
xfs_alloc.h xfs: move allocation stack switch up to xfs_bmapi_allocate 2012-11-08 11:08:46 -06:00
xfs_alloc_btree.c xfs: invalidate allocbt blocks moved to the free list 2012-11-08 11:09:44 -06:00
xfs_alloc_btree.h xfs: struct xfs_buf_log_format isn't variable sized. 2012-07-01 14:50:04 -05:00
xfs_aops.c xfs: fix broken error handling in xfs_vm_writepage 2012-11-17 09:35:42 -06:00
xfs_aops.h Prefix IO_XX flags with XFS_IO_XX to avoid namespace colision. 2012-07-22 11:00:55 -05:00
xfs_attr.c xfs: remove struct xfs_dabuf and infrastructure 2012-07-01 14:50:07 -05:00
xfs_attr.h
xfs_attr_leaf.c xfs: fix attr tree double split corruption 2012-11-17 09:34:13 -06:00
xfs_attr_leaf.h xfs: remove struct xfs_dabuf and infrastructure 2012-07-01 14:50:07 -05:00
xfs_attr_sf.h
xfs_bit.c
xfs_bit.h
xfs_bmap.c xfs: move allocation stack switch up to xfs_bmapi_allocate 2012-11-08 11:08:46 -06:00
xfs_bmap.h xfs: move allocation stack switch up to xfs_bmapi_allocate 2012-11-08 11:08:46 -06:00
xfs_bmap_btree.c xfs: move xfsagino_t to xfs_types.h 2012-05-14 16:20:54 -05:00
xfs_bmap_btree.h
xfs_btree.c xfs: move xfsagino_t to xfs_types.h 2012-05-14 16:20:54 -05:00
xfs_btree.h
xfs_buf.c xfs: drop buffer io reference when a bad bio is built 2012-11-17 09:36:57 -06:00
xfs_buf.h xfs: fix race while discarding buffers [V4] 2012-08-29 15:01:11 -05:00
xfs_buf_item.c xfs: fix buffer shudown reference count mismatch 2012-11-08 11:10:35 -06:00
xfs_buf_item.h xfs: support discontiguous buffers in the xfs_buf_log_item 2012-07-01 14:50:06 -05:00
xfs_da_btree.c xfs: remove struct xfs_dabuf and infrastructure 2012-07-01 14:50:07 -05:00
xfs_da_btree.h xfs: fix comment typo of struct xfs_da_blkinfo. 2012-07-22 10:34:42 -05:00
xfs_dfrag.c switch simple cases of fget_light to fdget 2012-09-26 22:20:08 -04:00
xfs_dfrag.h
xfs_dinode.h xfs: fix typo in comment of xfs_dinode_t. 2012-06-14 12:28:26 -05:00
xfs_dir2.c xfs: remove struct xfs_dabuf and infrastructure 2012-07-01 14:50:07 -05:00
xfs_dir2.h
xfs_dir2_block.c xfs: remove struct xfs_dabuf and infrastructure 2012-07-01 14:50:07 -05:00
xfs_dir2_data.c xfs: remove struct xfs_dabuf and infrastructure 2012-07-01 14:50:07 -05:00
xfs_dir2_format.h
xfs_dir2_leaf.c xfs: factor buffer reading from xfs_dir2_leaf_getdents 2012-07-01 14:50:08 -05:00
xfs_dir2_node.c xfs: remove struct xfs_dabuf and infrastructure 2012-07-01 14:50:07 -05:00
xfs_dir2_priv.h xfs: remove struct xfs_dabuf and infrastructure 2012-07-01 14:50:07 -05:00
xfs_dir2_sf.c xfs: remove struct xfs_dabuf and infrastructure 2012-07-01 14:50:07 -05:00
xfs_discard.c xfs: check for possible overflow in xfs_ioc_trim 2012-08-23 14:48:44 -05:00
xfs_discard.h
xfs_dquot.c xfs: move xfsagino_t to xfs_types.h 2012-05-14 16:20:54 -05:00
xfs_dquot.h xfs: on-stack delayed write buffer lists 2012-05-14 16:20:31 -05:00
xfs_dquot_item.c xfs: clean up xfs_bit.h includes 2012-05-14 16:21:00 -05:00
xfs_dquot_item.h
xfs_error.c xfs: move xfsagino_t to xfs_types.h 2012-05-14 16:20:54 -05:00
xfs_error.h
xfs_export.c tmpfs,ceph,gfs2,isofs,reiserfs,xfs: fix fh_len checking 2012-10-09 23:33:55 -04:00
xfs_export.h
xfs_extent_busy.c xfs: make xfs_extent_busy_trim not static 2012-05-14 16:21:04 -05:00
xfs_extent_busy.h xfs: make xfs_extent_busy_trim not static 2012-05-14 16:21:04 -05:00
xfs_extfree_item.c xfs: move xfsagino_t to xfs_types.h 2012-05-14 16:20:54 -05:00
xfs_extfree_item.h
xfs_file.c mm: kill vma flag VM_CAN_NONLINEAR 2012-10-09 16:22:17 +09:00
xfs_filestream.c
xfs_filestream.h
xfs_fs.h
xfs_fs_subr.c
xfs_fsops.c xfs: growfs: don't read garbage for new secondary superblocks 2012-11-08 11:08:57 -06:00
xfs_fsops.h
xfs_globals.c
xfs_ialloc.c xfs: zero allocation_args on the kernel stack 2012-11-08 11:08:10 -06:00
xfs_ialloc.h xfs: remove the alloc_done argument to xfs_dialloc 2012-07-29 16:00:31 -05:00
xfs_ialloc_btree.c xfs: move xfsagino_t to xfs_types.h 2012-05-14 16:20:54 -05:00
xfs_ialloc_btree.h
xfs_iget.c xfs: remove iolock lock classes 2012-07-29 16:23:51 -05:00
xfs_inode.c xfs: don't vmap inode cluster buffers during free 2012-11-08 11:10:18 -06:00
xfs_inode.h xfs: remove iolock lock classes 2012-07-29 16:23:51 -05:00
xfs_inode_item.c xfs: check for stale inode before acquiring iflock on push 2012-06-21 14:20:06 -05:00
xfs_inode_item.h xfs: pass shutdown method into xfs_trans_ail_delete_bulk 2012-05-14 16:20:33 -05:00
xfs_inum.h xfs: move xfsagino_t to xfs_types.h 2012-05-14 16:20:54 -05:00
xfs_ioctl.c xfs: silence uninitialised f.file warning. 2012-11-08 11:09:17 -06:00
xfs_ioctl.h
xfs_ioctl32.c xfs: Convert to new freezing code 2012-07-31 09:45:48 +04:00
xfs_ioctl32.h
xfs_iomap.c xfs: introduce XFS_BMAPI_STACK_SWITCH 2012-11-08 11:08:27 -06:00
xfs_iomap.h
xfs_iops.c xfs: update for 3.6-rc1 2012-07-30 13:37:53 -07:00
xfs_iops.h
xfs_itable.c xfs: merge xfs_itobp into xfs_imap_to_bp 2012-07-22 10:46:56 -05:00
xfs_itable.h
xfs_linux.h
xfs_log.c xfs: only update the last_sync_lsn when a transaction completes 2012-11-08 11:07:38 -06:00
xfs_log.h xfs: allow assigning the tail lsn with the AIL lock held 2012-05-14 16:20:26 -05:00
xfs_log_cil.c xfs: rename log structure to xlog 2012-06-21 14:21:11 -05:00
xfs_log_priv.h xfs: remove xlog_t typedef 2012-06-21 14:22:27 -05:00
xfs_log_recover.c xfs: fix reading of wrapped log data 2012-11-08 11:10:51 -06:00
xfs_log_recover.h
xfs_message.c xfs: move xfsagino_t to xfs_types.h 2012-05-14 16:20:54 -05:00
xfs_message.h
xfs_mount.c xfs: reduce code duplication handling inode32/64 options 2012-09-26 15:56:33 -05:00
xfs_mount.h xfs: kill struct declarations in xfs_mount.h 2012-08-16 13:29:35 -05:00
xfs_mru_cache.c
xfs_mru_cache.h
xfs_qm.c xfs: make largest supported offset less shouty 2012-06-14 12:28:24 -05:00
xfs_qm.h
xfs_qm_bhv.c xfs: clean up xfs_bit.h includes 2012-05-14 16:21:00 -05:00
xfs_qm_syscalls.c xfs: move xfsagino_t to xfs_types.h 2012-05-14 16:20:54 -05:00
xfs_quota.h
xfs_quota_priv.h
xfs_quotaops.c userns: Convert qutoactl 2012-09-18 01:01:39 -07:00
xfs_rename.c xfs: move xfsagino_t to xfs_types.h 2012-05-14 16:20:54 -05:00
xfs_rtalloc.c xfs: fix uninitialised variable in xfs_rtbuf_get() 2012-08-23 14:48:16 -05:00
xfs_rtalloc.h
xfs_sb.h
xfs_stats.c
xfs_stats.h
xfs_super.c xfs: update for 3.7-rc1 2012-10-02 20:42:58 -07:00
xfs_super.h xfs: reduce code duplication handling inode32/64 options 2012-09-26 15:56:33 -05:00
xfs_sync.c workqueue: deprecate flush[_delayed]_work_sync() 2012-08-20 14:51:24 -07:00
xfs_sync.h
xfs_sysctl.c
xfs_sysctl.h
xfs_trace.c xfs: clean up xfs_bit.h includes 2012-05-14 16:21:00 -05:00
xfs_trace.h xfs: kill struct declarations in xfs_mount.h 2012-08-16 13:29:35 -05:00
xfs_trans.c xfs: Convert to new freezing code 2012-07-31 09:45:48 +04:00
xfs_trans.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-08-01 10:26:23 -07:00
xfs_trans_ail.c xfs: re-enable xfsaild idle mode and fix associated races 2012-07-29 16:27:57 -05:00
xfs_trans_buf.c xfs: add discontiguous buffer support to transactions 2012-07-01 14:50:06 -05:00
xfs_trans_dquot.c userns: Convert quota netlink aka quota_send_warning 2012-09-18 01:01:40 -07:00
xfs_trans_extfree.c xfs: move xfsagino_t to xfs_types.h 2012-05-14 16:20:54 -05:00
xfs_trans_inode.c xfs: clean up xfs_bit.h includes 2012-05-14 16:21:00 -05:00
xfs_trans_priv.h xfs: re-enable xfsaild idle mode and fix associated races 2012-07-29 16:27:57 -05:00
xfs_trans_space.h
xfs_types.h xfs: struct xfs_buf_log_format isn't variable sized. 2012-07-01 14:50:04 -05:00
xfs_utils.c xfs: remove the alloc_done argument to xfs_dialloc 2012-07-29 16:00:31 -05:00
xfs_utils.h
xfs_vnode.h
xfs_vnodeops.c xfs: avoid the iolock in xfs_free_eofblocks for evicted inodes 2012-07-29 16:22:20 -05:00
xfs_vnodeops.h
xfs_xattr.c