Hi, Akira, Akira Fujita wrote: > Hi Peng, > Peng Tao wrote: >>>> After applying the two patches, I run my test case with first.img as the orig file (and middle.img or >>>> last.img as donor file). My kernel panics and I find following message in /var/log/messages after reboot: >>> I could not reproduce this panic. >>> Would you tell me about your test environment (1-5)? >>> >>> 1. What is your kernel version? (2.6.31-rc2 + ext4 patch queue + my patch?) >> Only 2.6.31-rc2 from linus tree + your two patches. I didn't apply ext4 patch queue. >>> 2. What FS mount options are enabled? >> rw,noatime,relatime,commit=360 >>> 3. What options are enabled to create ext4? >> [bergwolf@~]$sudo tune2fs -l /dev/sda9 >> tune2fs 1.41.9 (22-Aug-2009) >> Filesystem volume name: <none> >> Last mounted on: /other >> Filesystem UUID: 90548cb8-5748-4b18-bbe9-e7254439cb82 >> Filesystem magic number: 0xEF53 >> Filesystem revision #: 1 (dynamic) >> Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize >> Filesystem flags: signed_directory_hash >> Default mount options: (none) >> Filesystem state: clean >> Errors behavior: Continue >> Filesystem OS type: Linux >> Inode count: 125184 >> Block count: 500015 >> Reserved block count: 25000 >> Free blocks: 299959 >> Free inodes: 125162 >> First block: 0 >> Block size: 4096 >> Fragment size: 4096 >> Reserved GDT blocks: 122 >> Blocks per group: 32768 >> Fragments per group: 32768 >> Inodes per group: 7824 >> Inode blocks per group: 489 >> Flex block group size: 16 >> Filesystem created: Sun Sep 7 15:13:09 2008 >> Last mount time: Tue Sep 8 15:19:44 2009 >> Last write time: Tue Sep 8 15:19:44 2009 >> Mount count: 13 >> Maximum mount count: 36 >> Last checked: Fri Sep 4 20:56:50 2009 >> Check interval: 15552000 (6 months) >> Next check after: Wed Mar 3 20:56:50 2010 >> Lifetime writes: 1128 MB >> Reserved blocks uid: 0 (user root) >> Reserved blocks gid: 0 (group root) >> First inode: 11 >> Inode size: 256 >> Required extra isize: 28 >> Desired extra isize: 28 >> Journal inode: 8 >> Default directory hash: tea >> Directory Hash Seed: 3c5f2a77-c446-4124-94f7-958ba6155f37 >> Journal backup: inode blocks >>> 4. Are image files (first.img, middle.img and last.img) >>> same as your previous mail? >>> http://marc.info/?l=linux-ext4&m=124992522305319&w=2 >> Yes. >>> 5. What arguments are set to EXT4_IOC_MOVE_EXT in your test case? >> move_data.donor_fd = donor_fd; >> move_data.orig_start = 0; >> move_data.donor_start = 0; >> move_data.len = SECTOR_TO_BLOCK(statbuf.st_blocks, fs.f_bsize); >> >> err = ioctl(orig_fd, EXT4_IOC_MOVE_EXT, &move_data); > > I tried to reproduce your problem with the following steps, > but I couldn't. Please check my procedure. > > 1. Test environment > linux2.6.31-rc2 + two patches as follows: > http://marc.info/?l=linux-ext4&m=125186152727422&w=3 > http://marc.info/?l=linux-ext4&m=125205817410548&w=3 > > 2. Create ext4 filesystem and mount it > mke2fs -t ext4 -b 4096 /dev/XXX > mount -t ext4 -O rw,noatime,relatime,commit=360 /dev/XXX /mnt/XXX > > 3. Create orig and donor files > dd if=/dev/urandom of=/mnt/XXX/first.img bs=10M count=1 > dd if=/dev/zero of=/mnt/XXX/first.img bs=10M count=0 seek=50 > dd if=/dev/urandom of=/mnt/XXX/last.img bs=10M count=1 seek=49 > > 4. Call EXT4_MOVE_MOVE_EXT ioctl to files with the following arguments > (orig_file = /mnt/XXX/first.img, donor_file = /mnt/XXX/last.img) > move_data.orig_start = 0; > move_data.donor_start = 0; > move_data.len = 12152; > ioctl(orig_fd, EXT4_IOC_MOVE_EXT, &move_data) > > However, EXT4_IOC_MOVE_EXT returned ENODATA (this is a fine result by my patch) > and it didn't occur the kernel panic which you got. > If I chose a wrong step, please correct me. Sorry, I didn't notice that I was at commit 7638d5322bd89d49e013a03fe2afaeb6d214fabd of linus tree that includes a few patches after 2.6.31-rc2. > > I appreciate if you could test following environment. > - 2.6.31-rc8 + ext4 patch queue > (commit:bdacccd94d08a3f89e7fca676b28aa262c6d75fa) + attached patch I can't reproduce the panic in the above environment. I believe the problem is fixed. Thanks for your work! > > Regards, > Akira Fujita > > --- > fs/ext4/move_extent.c | 72 +++++++++++++++++++++++++++++++++--------------- > 1 files changed, 49 insertions(+), 23 deletions(-) > > diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c > index 7bfbd58..7266247 100644 > --- a/fs/ext4/move_extent.c > +++ b/fs/ext4/move_extent.c > @@ -25,6 +25,8 @@ > if (IS_ERR(path)) { \ > ret = PTR_ERR(path); \ > path = NULL; \ > + } else if (path[ext_depth(inode)].p_ext == NULL) { \ > + ret = -ENODATA; \ > } \ > } while (0) > > @@ -284,7 +286,7 @@ mext_insert_across_blocks(handle_t *handle, struct inode *orig_inode, > > if (new_flag) { > get_ext_path(orig_path, orig_inode, eblock, err); > - if (orig_path == NULL) > + if (err) > goto out; > > if (ext4_ext_insert_extent(handle, orig_inode, > @@ -295,7 +297,7 @@ mext_insert_across_blocks(handle_t *handle, struct inode *orig_inode, > if (end_flag) { > get_ext_path(orig_path, orig_inode, > le32_to_cpu(end_ext->ee_block) - 1, err); > - if (orig_path == NULL) > + if (err) > goto out; > > if (ext4_ext_insert_extent(handle, orig_inode, > @@ -554,8 +556,10 @@ mext_leaf_block(handle_t *handle, struct inode *orig_inode, > * @orig_off: block offset of original inode > * @donor_off: block offset of donor inode > * @max_count: the maximun length of extents > + * > + * Return 0 on success, or a negative error value on failure. > */ > -static void > +static int > mext_calc_swap_extents(struct ext4_extent *tmp_dext, > struct ext4_extent *tmp_oext, > ext4_lblk_t orig_off, ext4_lblk_t donor_off, > @@ -564,6 +568,19 @@ mext_calc_swap_extents(struct ext4_extent *tmp_dext, > ext4_lblk_t diff, orig_diff; > struct ext4_extent dext_old, oext_old; > > + BUG_ON(orig_off != donor_off); > + > + /* original and donor extents have to cover the same block offset */ > + if (orig_off < le32_to_cpu(tmp_oext->ee_block) || > + le32_to_cpu(tmp_oext->ee_block) + > + ext4_ext_get_actual_len(tmp_oext) - 1 < orig_off) > + return -ENODATA; > + > + if (orig_off < le32_to_cpu(tmp_dext->ee_block) || > + le32_to_cpu(tmp_dext->ee_block) + > + ext4_ext_get_actual_len(tmp_dext) - 1 < orig_off) > + return -ENODATA; > + > dext_old = *tmp_dext; > oext_old = *tmp_oext; > > @@ -591,6 +608,8 @@ mext_calc_swap_extents(struct ext4_extent *tmp_dext, > > copy_extent_status(&oext_old, tmp_dext); > copy_extent_status(&dext_old, tmp_oext); > + > + return 0; > } > > /** > @@ -632,12 +651,12 @@ mext_replace_branches(handle_t *handle, struct inode *orig_inode, > > /* Get the original extent for the block "orig_off" */ > get_ext_path(orig_path, orig_inode, orig_off, err); > - if (orig_path == NULL) > + if (err) > goto out; > > /* Get the donor extent for the head */ > get_ext_path(donor_path, donor_inode, donor_off, err); > - if (donor_path == NULL) > + if (err) > goto out; > depth = ext_depth(orig_inode); > oext = orig_path[depth].p_ext; > @@ -647,8 +666,10 @@ mext_replace_branches(handle_t *handle, struct inode *orig_inode, > dext = donor_path[depth].p_ext; > tmp_dext = *dext; > > - mext_calc_swap_extents(&tmp_dext, &tmp_oext, orig_off, > + err = mext_calc_swap_extents(&tmp_dext, &tmp_oext, orig_off, > donor_off, count); > + if (err) > + goto out; > > /* Loop for the donor extents */ > while (1) { > @@ -679,7 +700,7 @@ mext_replace_branches(handle_t *handle, struct inode *orig_inode, > if (orig_path) > ext4_ext_drop_refs(orig_path); > get_ext_path(orig_path, orig_inode, orig_off, err); > - if (orig_path == NULL) > + if (err) > goto out; > depth = ext_depth(orig_inode); > oext = orig_path[depth].p_ext; > @@ -694,7 +715,7 @@ mext_replace_branches(handle_t *handle, struct inode *orig_inode, > ext4_ext_drop_refs(donor_path); > get_ext_path(donor_path, donor_inode, > donor_off, err); > - if (donor_path == NULL) > + if (err) > goto out; > depth = ext_depth(donor_inode); > dext = donor_path[depth].p_ext; > @@ -705,9 +726,10 @@ mext_replace_branches(handle_t *handle, struct inode *orig_inode, > } > tmp_dext = *dext; > > - mext_calc_swap_extents(&tmp_dext, &tmp_oext, orig_off, > - donor_off, > - count - replaced_count); > + err = mext_calc_swap_extents(&tmp_dext, &tmp_oext, orig_off, > + donor_off, count - replaced_count); > + if (err) > + goto out; > } > > out: > @@ -1156,27 +1178,27 @@ ext4_move_extents(struct file *o_filp, struct file *d_filp, > len -= block_end - file_end; > > get_ext_path(orig_path, orig_inode, block_start, ret); > - if (orig_path == NULL) > + if (ret) > goto out2; > > /* Get path structure to check the hole */ > get_ext_path(holecheck_path, orig_inode, block_start, ret); > - if (holecheck_path == NULL) > + if (ret) > goto out; > > depth = ext_depth(orig_inode); > ext_cur = holecheck_path[depth].p_ext; > - if (ext_cur == NULL) { > - ret = -EINVAL; > - goto out; > - } > > /* > - * Get proper extent whose ee_block is beyond block_start > - * if block_start was within the hole. > + * Get proper starting location of block replacement if block_start was > + * within the hole. > */ > if (le32_to_cpu(ext_cur->ee_block) + > ext4_ext_get_actual_len(ext_cur) - 1 < block_start) { > + /* > + * The hole exists between extents or the tail of > + * original file. > + */ > last_extent = mext_next_extent(orig_inode, > holecheck_path, &ext_cur); > if (last_extent < 0) { > @@ -1189,8 +1211,12 @@ ext4_move_extents(struct file *o_filp, struct file *d_filp, > ret = last_extent; > goto out; > } > - } > - seq_start = block_start; > + seq_start = le32_to_cpu(ext_cur->ee_block); > + } else if (le32_to_cpu(ext_cur->ee_block) > block_start) > + /* The hole exists at the beginning of original file. */ > + seq_start = le32_to_cpu(ext_cur->ee_block); > + else > + seq_start = block_start; > > /* No blocks within the specified range. */ > if (le32_to_cpu(ext_cur->ee_block) > block_end) { > @@ -1292,7 +1318,7 @@ ext4_move_extents(struct file *o_filp, struct file *d_filp, > ext4_ext_drop_refs(holecheck_path); > get_ext_path(holecheck_path, orig_inode, > seq_start, ret); > - if (holecheck_path == NULL) > + if (ret) > break; > depth = holecheck_path->p_depth; > > @@ -1300,7 +1326,7 @@ ext4_move_extents(struct file *o_filp, struct file *d_filp, > if (orig_path) > ext4_ext_drop_refs(orig_path); > get_ext_path(orig_path, orig_inode, seq_start, ret); > - if (orig_path == NULL) > + if (ret) > break; > > ext_cur = holecheck_path[depth].p_ext; > -- Best Regards, Peng Tao State Key Laboratory of Networking and Switching Technology Beijing Univ. of Posts and Telecoms. -- 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
