[PATCH] fix __writeback_single_inode WARN_ON
When the inode count is zero in inode writeback, the WARN_ON(!(inode->i_state & I_WILL_FREE)); is broken, and needs to test for either I_WILL_FREE|I_FREEING. When the inode is in I_FREEING state, it's already out of the visibility of the vm so it can't be freed so it doesn't require the __iget and the generic_delete_inode path can call the sync internally to the lowlevel fs callback during the last iput. So the inode being in I_FREEING is also a valid condition for calling the sync with i_count == 0. The specific stack trace is this: 0xc00000007b8fb6e0 0xc00000000010118c .__writeback_single_inode +0x5c 0xc00000007b8fb6e0 0xc0000000001014dc (lr) .sync_inode +0x3c 0xc00000007b8fb790 0xc0000000001014dc .sync_inode +0x3c 0xc00000007b8fb820 0xc0000000001a5020 .ext2_sync_inode +0x64 0xc00000007b8fb8f0 0xc0000000001a65b4 .ext2_truncate +0x3f8 0xc00000007b8fba40 0xc0000000001a6940 .ext2_delete_inode +0xdc 0xc00000007b8fbac0 0xc0000000000f7a5c .generic_delete_inode +0x124 0xc00000007b8fbb50 0xc0000000000f5fe0 .iput +0xb8 0xc00000007b8fbbe0 0xc0000000000e9fd4 .sys_unlink +0x2a8 0xc00000007b8fbd10 0xc00000000001048c .ret_from_syscall_1 +0x0 Signed-off-by:Andrew Morton <akpm@osdl.org> Signed-off-by:
Linus Torvalds <torvalds@osdl.org>
parent
a717f773
Please register or sign in to comment