tree baa891a409d8c70ea16a5d9ac676c7dc9bed6a5b
parent ddb24bbac3681b87ae0638aacb702d9273e3c025
author Prasad Joshi <prasadjoshi.linux@gmail.com> 1343016352 +0530
committer Prasad Joshi <prasadjoshi.linux@gmail.com> 1343016352 +0530

logfs: maintain the ordering of meta-inode destruction

LogFS does not use a specialized area to maintain the inodes. The
inodes information is kept in a specialized file called inode file.
Similarly, the segment information is kept in a segment file. Since
the segment file also has an inode which is kept in the inode file,
the inode for segment file must be evicted before the inode for inode
file. The change fixes the following BUG during unmount

Pid: 2057, comm: umount Not tainted 3.5.0-rc6+ #25 Bochs Bochs
RIP: 0010:[<ffffffffa005c5f2>]  [<ffffffffa005c5f2>] move_page_to_btree+0x32/0x1f0 [logfs]
Process umount (pid: 2057, threadinfo ...)
Call Trace:
[<ffffffff8112adca>] ? find_get_pages+0x2a/0x180
[<ffffffffa00549f5>] logfs_invalidatepage+0x85/0x90 [logfs]
[<ffffffff81136c51>] truncate_inode_page+0xb1/0xd0
[<ffffffff81136dcf>] truncate_inode_pages_range+0x15f/0x490
[<ffffffff81558549>] ? printk+0x78/0x7a
[<ffffffff81137185>] truncate_inode_pages+0x15/0x20
[<ffffffffa005b7fc>] logfs_evict_inode+0x6c/0x190 [logfs]
[<ffffffff8155c75b>] ? _raw_spin_unlock+0x2b/0x40
[<ffffffff8119e3d7>] evict+0xa7/0x1b0
[<ffffffff8119ea6e>] dispose_list+0x3e/0x60
[<ffffffff8119f1c4>] evict_inodes+0xf4/0x110
[<ffffffff81185b53>] generic_shutdown_super+0x53/0xf0
[<ffffffffa005d8f2>] logfs_kill_sb+0x52/0xf0 [logfs]
[<ffffffff81185ec5>] deactivate_locked_super+0x45/0x80
[<ffffffff81186a4a>] deactivate_super+0x4a/0x70
[<ffffffff811a228e>] mntput_no_expire+0xde/0x140
[<ffffffff811a30ff>] sys_umount+0x6f/0x3a0
[<ffffffff8155d8e9>] system_call_fastpath+0x16/0x1b
---[ end trace 45f7752082cefafd ]---

Signed-off-by: Prasad Joshi <prasadjoshi.linux@gmail.com>