Hi All, When I run xfstest to do some tests in upstream kernel (commit id: d43b7167), I get a warning from dmesg. The warning is as below: Oct 8 22:39:45 lz-desktop kernel: EXT4-fs (sda1): ext4_da_update_reserve_space: ino 21, allocated 1 with only 0 reserved metadata blocks Oct 8 22:39:45 lz-desktop kernel: Oct 8 22:39:45 lz-desktop kernel: ------------[ cut here ]------------ Oct 8 22:39:45 lz-desktop kernel: WARNING: at fs/ext4/inode.c:362 ext4_da_update_reserve_space+0x116/0x224 [ext4]() Oct 8 22:39:45 lz-desktop kernel: Hardware name: OptiPlex 780 Oct 8 22:39:45 lz-desktop kernel: Modules linked in: ext4(O) jbd2 crc16 autofs4 cpufreq_ondemand acpi_cpufreq mperf ipv6 dm_mirror dm_region_hash dm_log dm_mod dcdbas pcspkr serio_raw i2c_i801 i2c_core sg parport_pc parport snd_hda_codec_analog snd_hda_intel snd_hda_codec snd_seq snd_seq_device snd_pcm snd_timer snd soundcore snd_page_alloc e1000e button ext3 jbd sd_mod ahci libahci libata scsi_mod ehci_hcd uhci_hcd Oct 8 22:39:45 lz-desktop kernel: Pid: 9239, comm: fsx Tainted: G W O 3.6.0+ #23 Oct 8 22:39:45 lz-desktop kernel: Call Trace: Oct 8 22:39:45 lz-desktop kernel: [<ffffffff8203212e>] warn_slowpath_common+0x85/0x9d Oct 8 22:39:45 lz-desktop kernel: [<ffffffff82032160>] warn_slowpath_null+0x1a/0x1c Oct 8 22:39:45 lz-desktop kernel: [<ffffffffa0299c63>] ext4_da_update_reserve_space+0x116/0x224 [ext4] Oct 8 22:39:45 lz-desktop kernel: [<ffffffffa02c0a5d>] ext4_ext_map_blocks+0xd42/0xf36 [ext4] Oct 8 22:39:45 lz-desktop kernel: [<ffffffffa029a66e>] ? ext4_map_blocks+0x10c/0x1f8 [ext4] Oct 8 22:39:45 lz-desktop kernel: [<ffffffffa029a66e>] ? ext4_map_blocks+0x10c/0x1f8 [ext4] Oct 8 22:39:45 lz-desktop kernel: [<ffffffffa029a6a0>] ext4_map_blocks+0x13e/0x1f8 [ext4] Oct 8 22:39:45 lz-desktop kernel: [<ffffffffa029af29>] mpage_da_map_and_submit+0x117/0x497 [ext4] Oct 8 22:39:45 lz-desktop kernel: [<ffffffffa029ba55>] ext4_da_writepages+0x37d/0x52b [ext4] Oct 8 22:39:45 lz-desktop kernel: [<ffffffff8205fef5>] ? sched_clock_local+0x1c/0x82 Oct 8 22:39:45 lz-desktop kernel: [<ffffffff820ca586>] do_writepages+0x23/0x2c Oct 8 22:39:45 lz-desktop kernel: [<ffffffff820c2eb6>] __filemap_fdatawrite_range+0x53/0x55 Oct 8 22:39:45 lz-desktop kernel: [<ffffffff820c2ee8>] filemap_write_and_wait_range+0x30/0x59 Oct 8 22:39:45 lz-desktop kernel: [<ffffffffa0292916>] ext4_sync_file+0x9a/0x35c [ext4] Oct 8 22:39:45 lz-desktop kernel: [<ffffffff82060057>] ? local_clock+0x2b/0x3c Oct 8 22:39:45 lz-desktop kernel: [<ffffffff82071b1f>] ? lock_release_holdtime+0x1c/0x11f Oct 8 22:39:45 lz-desktop kernel: [<ffffffff821261ff>] vfs_fsync_range+0x1d/0x26 Oct 8 22:39:45 lz-desktop kernel: [<ffffffff82126224>] vfs_fsync+0x1c/0x1e Oct 8 22:39:45 lz-desktop kernel: [<ffffffff820e7b3a>] sys_msync+0x116/0x190 Oct 8 22:39:45 lz-desktop kernel: [<ffffffff821cc7de>] ? trace_hardirqs_on_thunk+0x3a/0x3f Oct 8 22:39:45 lz-desktop kernel: [<ffffffff823a5492>] system_call_fastpath+0x16/0x1b Oct 8 22:39:45 lz-desktop kernel: ---[ end trace f6002ce762f77c1e ]--- ... This warning is printed when test case #127 and #225 are being run with bigalloc and delalloc. You could use the following commands to reproduce it using xfstest. 1. mkfs.ext4 -O bigalloc /dev/XXX1 2. mkfs.ext4 -O bigalloc /dev/XXX2 3. export MKFS_OPTIONS="-O bigalloc" 4. export MOUNT_OPTIONS="-o acl,user_xattr" 5. ./check 127 I notice that the warning is from ext4_da_update_reserve_space(), and in this function a new 'if' statement is added (commit id: 97795d2a). Hopefully it is useful to fix this problem. Thanks. Regards, Zheng -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
