Messages in this thread | | | Date | Mon, 27 Mar 2023 20:06:32 +0800 | Subject | Re: [PATCH v2 1/2] ext4: turning quotas off if mount failed after enable quotas | From | Baokun Li <> |
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On 2023/3/27 17:05, Jan Kara wrote: > On Mon 27-03-23 10:27:02, Baokun Li wrote: >> Yi found during a review of the patch "ext4: don't BUG on inconsistent >> journal feature" that when ext4_mark_recovery_complete() returns an error >> value, the error handling path does not turn off the enabled quotas, >> which triggers the following kmemleak: >> >> ================================================================ >> unreferenced object 0xffff8cf68678e7c0 (size 64): >> comm "mount", pid 746, jiffies 4294871231 (age 11.540s) >> hex dump (first 32 bytes): >> 00 90 ef 82 f6 8c ff ff 00 00 00 00 41 01 00 00 ............A... >> c7 00 00 00 bd 00 00 00 0a 00 00 00 48 00 00 00 ............H... >> backtrace: >> [<00000000c561ef24>] __kmem_cache_alloc_node+0x4d4/0x880 >> [<00000000d4e621d7>] kmalloc_trace+0x39/0x140 >> [<00000000837eee74>] v2_read_file_info+0x18a/0x3a0 >> [<0000000088f6c877>] dquot_load_quota_sb+0x2ed/0x770 >> [<00000000340a4782>] dquot_load_quota_inode+0xc6/0x1c0 >> [<0000000089a18bd5>] ext4_enable_quotas+0x17e/0x3a0 [ext4] >> [<000000003a0268fa>] __ext4_fill_super+0x3448/0x3910 [ext4] >> [<00000000b0f2a8a8>] ext4_fill_super+0x13d/0x340 [ext4] >> [<000000004a9489c4>] get_tree_bdev+0x1dc/0x370 >> [<000000006e723bf1>] ext4_get_tree+0x1d/0x30 [ext4] >> [<00000000c7cb663d>] vfs_get_tree+0x31/0x160 >> [<00000000320e1bed>] do_new_mount+0x1d5/0x480 >> [<00000000c074654c>] path_mount+0x22e/0xbe0 >> [<0000000003e97a8e>] do_mount+0x95/0xc0 >> [<000000002f3d3736>] __x64_sys_mount+0xc4/0x160 >> [<0000000027d2140c>] do_syscall_64+0x3f/0x90 >> ================================================================ >> >> To solve this problem, we add a "failed_mount10" tag, and call >> ext4_quota_off_umount() in this tag to release the enabled qoutas. >> >> Fixes: 11215630aada ("ext4: don't BUG on inconsistent journal feature") >> Cc: stable@kernel.org >> Signed-off-by: Zhang Yi <yi.zhang@huawei.com> >> Signed-off-by: Baokun Li <libaokun1@huawei.com> > Looks good. Just one comment: > >> +failed_mount10: >> +#ifdef CONFIG_QUOTA >> + ext4_quota_off_umount(sb); >> failed_mount9: >> +#endif /* CONFIG_QUOTA */ > How about dealing with this using __maybe_unused attribute instead. Like: > > failed_mount9: __maybe_unused > > That would be much easier to read... > > Honza
Indeed!
Thank you very much for the review!
I will send a patch V3 with the changes suggested by you. -- With Best Regards, Baokun Li .
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