Dave Chinner 49641f1acf Fix reference counting race on log buffers ... When we release the iclog, we do an atomic_dec_and_lock to determine if we are the last reference and need to trigger update of log headers and writeout. However, in xlog_state_get_iclog_space() we also need to check if we have the last reference count there. If we do, we release the log buffer, otherwise we decrement the reference count. But the compare and decrement in xlog_state_get_iclog_space() is not atomic, so both places can see a reference count of 2 and neither will release the iclog. That leads to a filesystem hang. Close the race by replacing the atomic_read() and atomic_dec() pair with atomic_add_unless() to ensure that they are executed atomically. Signed-off-by: Dave Chinner <david@fromorbit.com> Reviewed-by: Tim Shimmin <tes@sgi.com> Tested-by: Eric Sandeen <sandeen@sandeen.net> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2008-07-11 11:37:18 -07:00
..
linux-2.6	[XFS] Fix memory corruption with small buffer reads	2008-05-23 18:12:49 +10:00
quota	[XFS] shrink mrlock_t	2008-04-29 15:54:02 +10:00
support	[XFS] Include linux/random.h in all builds, not just debug builds.	2008-04-30 18:17:44 +10:00
Kconfig	[XFS] allow enabling CONFIG_XFS_DEBUG	2008-04-29 16:07:48 +10:00
Makefile	[XFS] Added quota targets and removed dmapi directory	2008-02-18 13:06:17 +11:00
xfs_acl.c	[XFS] Cleanup xfs_attr a bit with xfs_name and remove cred	2008-04-29 15:54:55 +10:00
xfs_acl.h
xfs_ag.h
xfs_alloc_btree.c
xfs_alloc_btree.h
xfs_alloc.c	[XFS] fix logic error in xfs_alloc_ag_vextent_near()	2008-04-18 12:03:02 +10:00
xfs_alloc.h
xfs_arch.h
xfs_attr_leaf.c	[XFS] Always use di_forkoff when checking for attr space.	2008-04-18 12:03:40 +10:00
xfs_attr_leaf.h
xfs_attr_sf.h
xfs_attr.c	[XFS] Cleanup xfs_attr a bit with xfs_name and remove cred	2008-04-29 15:54:55 +10:00
xfs_attr.h	[XFS] Cleanup xfs_attr a bit with xfs_name and remove cred	2008-04-29 15:54:55 +10:00
xfs_bit.c	[XFS] Undo bit ops cleanup mod due to regression on 32-bit powermac	2008-02-26 17:05:44 +11:00
xfs_bit.h	[XFS] Undo bit ops cleanup mod due to regression on 32-bit powermac	2008-02-26 17:05:44 +11:00
xfs_bmap_btree.c	[XFS] replace remaining __FUNCTION__ occurrences	2008-04-18 11:51:26 +10:00
xfs_bmap_btree.h	[XFS] remove shouting-indirection macros from xfs_sb.h	2008-04-10 16:24:45 +10:00
xfs_bmap.c	[XFS] shrink mrlock_t	2008-04-29 15:54:02 +10:00
xfs_bmap.h	[XFS] replace remaining __FUNCTION__ occurrences	2008-04-18 11:51:26 +10:00
xfs_btree.c
xfs_btree.h
xfs_buf_item.c	[XFS] Ensure xfs_bawrite() errors are checked.	2008-04-18 12:00:35 +10:00
xfs_buf_item.h
xfs_clnt.h	[XFS] If you mount an XFS filesystem with no mount options at all, then	2008-02-28 20:37:56 -08:00
xfs_da_btree.c
xfs_da_btree.h
xfs_dfrag.c	[XFS] remove manual lookup from xfs_rename and simplify locking	2008-04-29 15:54:12 +10:00
xfs_dfrag.h
xfs_dinode.h
xfs_dir2_block.c
xfs_dir2_block.h
xfs_dir2_data.c
xfs_dir2_data.h
xfs_dir2_leaf.c
xfs_dir2_leaf.h
xfs_dir2_node.c
xfs_dir2_node.h
xfs_dir2_sf.c
xfs_dir2_sf.h
xfs_dir2_trace.c
xfs_dir2_trace.h
xfs_dir2.c	[XFS] remove bhv_vname_t and xfs_rename code	2008-04-18 12:00:12 +10:00
xfs_dir2.h	[XFS] remove bhv_vname_t and xfs_rename code	2008-04-18 12:00:12 +10:00
xfs_dmapi.h
xfs_dmops.c
xfs_error.c
xfs_error.h
xfs_extfree_item.c
xfs_extfree_item.h
xfs_filestream.c	[XFS] replace remaining __FUNCTION__ occurrences	2008-04-18 11:51:26 +10:00
xfs_filestream.h
xfs_fs.h
xfs_fsops.c	[XFS] Don't double count reserved block changes on UP.	2008-04-29 15:58:27 +10:00
xfs_fsops.h
xfs_ialloc_btree.c
xfs_ialloc_btree.h
xfs_ialloc.c	[XFS] Don't initialise new inode generation numbers to zero	2008-04-29 15:58:56 +10:00
xfs_ialloc.h
xfs_iget.c	[XFS] shrink mrlock_t	2008-04-29 15:54:02 +10:00
xfs_imap.h
xfs_inode_item.c	[XFS] shrink mrlock_t	2008-04-29 15:54:02 +10:00
xfs_inode_item.h	[XFS] Use xfs_inode_clean() in more places	2008-04-18 11:37:51 +10:00
xfs_inode.c	[XFS] Fix inode list allocation size in writeback.	2008-05-23 15:26:15 +10:00
xfs_inode.h	[XFS] remove manual lookup from xfs_rename and simplify locking	2008-04-29 15:54:12 +10:00
xfs_inum.h
xfs_iomap.c	[XFS] Fix check for block zero access in xfs_write_iomap_allocate()	2008-04-29 15:58:40 +10:00
xfs_iomap.h
xfs_itable.c	[XFS] kill di_mode checks after xfs_iget	2008-04-29 15:53:31 +10:00
xfs_itable.h
xfs_log_priv.h	[XFS] Reorganise xlog_t for better cacheline isolation of contention	2008-04-18 11:50:53 +10:00
xfs_log_recover.c	[XFS] Check for errors when changing buffer pointers.	2008-04-18 12:02:10 +10:00
xfs_log_recover.h
xfs_log.c	Fix reference counting race on log buffers	2008-07-11 11:37:18 -07:00
xfs_log.h	[XFS] Sanitise xfs_log_force error checking.	2008-04-18 12:02:20 +10:00
xfs_mount.c	[XFS] kill XFS_ICSB_SB_LOCKED	2008-04-29 15:57:38 +10:00
xfs_mount.h	[XFS] fix non-smp xfs build	2008-04-29 15:58:00 +10:00
xfs_mru_cache.c
xfs_mru_cache.h
xfs_qmops.c
xfs_quota.h
xfs_refcache.h
xfs_rename.c	[XFS] kill usesless IHOLD calls in xfs_rename	2008-04-29 15:54:24 +10:00
xfs_rtalloc.c	[XFS] Propagate errors from xfs_trans_commit().	2008-04-18 11:58:17 +10:00
xfs_rtalloc.h
xfs_rw.c	[XFS] Sanitise xfs_log_force error checking.	2008-04-18 12:02:20 +10:00
xfs_rw.h
xfs_sb.h	[XFS] Ensure "both" features2 slots are consistent	2008-04-10 16:25:26 +10:00
xfs_trans_ail.c	[XFS] replace remaining __FUNCTION__ occurrences	2008-04-18 11:51:26 +10:00
xfs_trans_buf.c	[XFS] Ensure errors from xfs_bdstrat() are correctly checked.	2008-04-18 12:00:24 +10:00
xfs_trans_extfree.c
xfs_trans_inode.c	[XFS] shrink mrlock_t	2008-04-29 15:54:02 +10:00
xfs_trans_item.c
xfs_trans_priv.h
xfs_trans_space.h
xfs_trans.c
xfs_trans.h	[XFS] Replace custom AIL linked-list code with struct list_head	2008-04-18 11:41:57 +10:00
xfs_types.h	[XFS] remove bhv_vname_t and xfs_rename code	2008-04-18 12:00:12 +10:00
xfs_utils.c	[XFS] remove manual lookup from xfs_rename and simplify locking	2008-04-29 15:54:12 +10:00
xfs_utils.h	[XFS] remove manual lookup from xfs_rename and simplify locking	2008-04-29 15:54:12 +10:00
xfs_vfsops.c	[XFS] remove xfs_log_ticket_zone on rmmod	2008-04-29 15:58:14 +10:00
xfs_vfsops.h
xfs_vnodeops.c	[XFS] Fix fsync() b0rkage.	2008-05-23 15:25:25 +10:00
xfs_vnodeops.h	[XFS] Fix fsync() b0rkage.	2008-05-23 15:25:25 +10:00
xfs.h	[XFS] Fix broken HAVE_SPLICE removal commit.	2008-04-29 15:57:49 +10:00