-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hope everyone had a happy new year :-) I'm starting to play around with LVM with the goal of having XFS, ext3, reiserfs and LVM coexist nicely together. Has anyone been able to get , ext3, reiserfs, XFS and LVM running nicely together? A week ago I posted a problem I was having with XFS and LVM in that the machine would Oops if the snapshot ever overflowed: Original post: http://marc.theaimsgroup.com/?l=linux-lvm&m=100942205812492&w=2 My followup: http://marc.theaimsgroup.com/?l=linux-lvm&m=100946566202294&w=2 At the time I thought I had solved the problem but upon further tests I found that the problems had just moved elsewhere. What I did was to run a series of tests using the SGI, CVS kernel (for XFS) as the base and added the appropriate LVM patches. The LVM patches were the VFS-lock patch and the lvm-1.0.1 upgrade patch. I ran various tests like creating snapshots and attempting to mount them, and then if that was successful would then overflow the snapshot to see if there were any problems. (I have not attempting to test pvmove or any of the others yet.) Attached below is the summary from the tests. After running all the tests I have found that there is not one case where ext3, reiserfs and xfs successfully coexist. Does anyone have any suggestions? as I'm completely stumped at the moment. The SGI CVS kernel is from the 26th Dec 2001 and is a 2.4.17 kernel. The LVM source is directly from the LVM download site. The system is based on RH7.2 with the default gcc compiler. There were no changes of the default kernel or LVM compile flags. If I have left out any important info please let me know. Any ideas or suggestions would be appreciated. Adrian NOTE: The back traces were done in kdb and are written here in shorthand only for the moment. NOTE: The LVM_VFS_ENHANCEMENT in lvm.c seems to disappear when using the lvm-1.0.1 upgrade patch. CVS XFS kernel & lvm Test results ============================ 2.4.17-xfs While source volume mounted: * Can create ext3 snapshot? | yes * Can mount a ext3 snapshot? | no: EXT3-fs: INFO: recovery required on readonly filesystem. EXT3-fs: write access unavailable, cannot proceed. * Can create resierfs snapshot? | yes * Can mount a resierfs snapshot? | yes * Can create xfs snapshot? | yes * Can mount a xfs snapshot? | yes NOTE: For some reason kernel thinks xfs is resierfs when mounted without -t xfs! When source & snapshot mounted: * Cause oops when snapshot overflows? | - ext3 | Cannot test - resierfs | OK - Stable - xfs | Oops btp 1207 (cp) lvm_snapshot_remap_block lvm_map md_make_request generic_makw_request [pagebuf]_pagebuf_page [pagebuf]_page_buf_page_apply [xfs]xlog_sync [xfs]xlog_state_release_iclog [xfs]xlog_write [xfs]xfs_log_write [xfs]xfs_trans_commit [xfs]xfs_create [xfslinvfs_common_cr [xfs]linvfs_create lookup_hash Running process (cp) 2.4.17-xfs + VFS-lock While source volume mounted: * Can create ext3 snapshot? | yes * Can mount a ext3 snapshot? | yes * Can create resierfs snapshot? | yes * Can mount a resierfs snapshot? | yes * Can create xfs snapshot? | yes * Can mount a xfs snapshot? | yes When source & snapshot mounted: * Cause oops when snapshot overflows? | - ext3 | Oops btp 5 (bdflush) lvm_snapshot_remap_block lvm_map lvm_make_request submit_bh write_locked_buffers write_some_buffers bdflush kernel_thread Running processes (bdflush, kjournald, klogd, cp) - resierfs | Oops btp 6 (kupdated) lvm_snapshot_remap_block lvm_map lvm_make_request generic_make_request submit_bh write_locked_buffers write_some_buffers balance_dirty sync_supers sync_old_buffers kupdated kernel_thread Running processes (kupdated, kreiserfsd, klogd) - xfs | OK - Stable 2.4.17-xfs + lvm-1.0.1 upgrade (without LVM_VFS_ENHANCEMENT) While source volume mounted: * Can create ext3 snapshot? | yes * Can mount a ext3 snapshot? | no EXT3-fs: INFO: recovery required on readonly filesystem. EXT3-fs: write access unavailable, cannot proceed. * Can create resierfs snapshot? | yes * Can mount a resierfs snapshot? | no resierfs: checking trasaction log (device 3a:04) ... clm-2076: device is readonly, unable to replay log Replay Failure, unable to mount resierfs_read_super: unable to initialize journal space * Can create xfs snapshot? | yes * Can mount a xfs snapshot? | yes When source & snapshot mounted: * Cause oops when snapshot overflows? | - ext3 | Cannot test - resierfs | Cannot test - xfs | OK - Stable 2.4.17-xfs + lvm-1.0.1 upgrade (with LVM_VFS_ENHANCEMENT) While source volume mounted: * Can create ext3 snapshot? | Cannot test * Can mount a ext3 snapshot? | Cannot test * Can create resierfs snapshot? | Cannot test * Can mount a resierfs snapshot? | Cannot test * Can create xfs snapshot? | Cannot test * Can mount a xfs snapshot? | Cannot test When source & snapshot mounted: * Cause oops when snapshot overflows? | - ext3 | Cannot test - resierfs | Cannot test - xfs | Cannot test Note: Kernel compile dies with: undefined reference to `fsync_dev_lockfs' undefined reference to `unlockfs' 2.4.17-xfs While source volume mounted: + VFS-lock + lvm-1.0.1 upgrade (VFS-lock patch removes LVM_VFS_ENHANCEMENT) * Can create ext3 snapshot? | yes * Can mount a ext3 snapshot? | yes * Can create resierfs snapshot? | yes * Can mount a resierfs snapshot? | yes * Can create xfs snapshot? | no - Oops btp 1356 (lvcreate) journal_start ext3_dirty_inode __mark_inode_dirty update_atime do_generic_file_read generic_file_read sys_read system_call Running processes (lvcreate) * Can mount a xfs snapshot? | Cannot test When source & snapshot mounted: * Cause oops when snapshot overflows? | - ext3 | OK - Stable - resierfs | OK - Stable - xfs | Cannot test Cannot complete boot sequence (RH scripts) after attempting to create xfs snapshot because of Oops - need to do full recovery! btp 154 (mount) send_signal deliver_signal send_sig_info error_code Running processes (none) - -- Adrian Head (Public Key available on request.) -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (GNU/Linux) Comment: For info see http://www.gnupg.org iD8DBQE8MoOq8ZJI8OvSkAcRArVHAJ0UkaOT2/agPlr667k/d+UAT0i2igCfedA7 3EDNqrrDDvRL7GWoBuglytk= =GwyP -----END PGP SIGNATURE-----
