73545817c9
We only allocate flush merge control structure sbi::sm_info::fcc_info when flush_merge option is on, but in f2fs_issue_flush we still try to access member of the control structure without that option, it incurs panic as show below, fix it. Call Trace: __remove_ino_entry+0xa9/0xc0 [f2fs] f2fs_do_sync_file.isra.27+0x214/0x6d0 [f2fs] f2fs_sync_file+0x18/0x20 [f2fs] vfs_fsync_range+0x3d/0xb0 __do_page_fault+0x261/0x4d0 do_fsync+0x3d/0x70 SyS_fsync+0x10/0x20 do_syscall_64+0x6e/0x180 entry_SYSCALL64_slow_path+0x25/0x25 RIP: 0033:0x7f18ce260de0 RSP: 002b:00007ffdd4589258 EFLAGS: 00000246 ORIG_RAX: 000000000000004a RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f18ce260de0 RDX: 0000000000000006 RSI: 00000000016c0360 RDI: 0000000000000003 RBP: 00000000016c0360 R08: 000000000000ffff R09: 000000000000001f R10: 00007ffdd4589020 R11: 0000000000000246 R12: 00000000016c0100 R13: 0000000000000000 R14: 00000000016c1f00 R15: 00000000016c0100 Code: fb 81 e3 00 08 00 00 48 89 45 a0 0f 1f 44 00 00 31 c0 85 db 75 27 41 81 e7 00 04 00 00 74 0c 41 8b 45 20 85 c0 0f 85 81 00 00 00 <f0> 41 ff 45 20 4c 89 e7 e8 f8 e9 ff ff f0 41 ff 4d 20 48 83 c4 RIP: f2fs_issue_flush+0x5b/0x170 [f2fs] RSP: ffffc90003b5fd78 CR2: 0000000000000020 ---[ end trace a09314c24f037648 ]--- Reported-by: Shuoran Liu <liushuoran@huawei.com> Signed-off-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.