From 149041070deb2e83cd36dc60bc72975b3cbf5bbe Mon Sep 17 00:00:00 2001 From: Eric Sandeen Date: Tue, 16 Oct 2007 18:38:25 -0400 Subject: [PATCH] ext4: lighten up resize transaction requirements When resizing online, setup_new_group_blocks attempts to reserve a potentially very large transaction, depending on the current filesystem geometry. For some journal sizes, there may not be enough room for this transaction, and the online resize will fail. The patch below resizes & restarts the transaction as necessary while setting up the new group, and should work with even the smallest journal. Tested with something like: [root@newbox ~]# dd if=/dev/zero of=fsfile bs=1024 count=32768 [root@newbox ~]# mkfs.ext3 -b 1024 fsfile 16384 [root@newbox ~]# mount -o loop fsfile mnt/ [root@newbox ~]# resize2fs /dev/loop0 resize2fs 1.40.2 (12-Jul-2007) Filesystem at /dev/loop0 is mounted on /root/mnt; on-line resizing required old desc_blocks = 1, new_desc_blocks = 1 Performing an on-line resize of /dev/loop0 to 32768 (1k) blocks. resize2fs: No space left on device While trying to add group #2 [root@newbox ~]# dmesg | tail -n 1 JBD: resize2fs wants too many credits (258 > 256) [root@newbox ~]# With the below change, it works. Signed-off-by: Eric Sandeen Signed-off-by: Mingming Cao Acked-by: Andreas Dilger --- fs/ext4/resize.c | 46 +++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 43 insertions(+), 3 deletions(-) diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c index 484e5699f84..bd8a52bb399 100644 --- a/fs/ext4/resize.c +++ b/fs/ext4/resize.c @@ -140,6 +140,32 @@ static struct buffer_head *bclean(handle_t *handle, struct super_block *sb, return bh; } +/* + * If we have fewer than thresh credits, extend by EXT4_MAX_TRANS_DATA. + * If that fails, restart the transaction & regain write access for the + * buffer head which is used for block_bitmap modifications. + */ +static int extend_or_restart_transaction(handle_t *handle, int thresh, + struct buffer_head *bh) +{ + int err; + + if (handle->h_buffer_credits >= thresh) + return 0; + + err = ext4_journal_extend(handle, EXT4_MAX_TRANS_DATA); + if (err < 0) + return err; + if (err) { + if ((err = ext4_journal_restart(handle, EXT4_MAX_TRANS_DATA))) + return err; + if ((err = ext4_journal_get_write_access(handle, bh))) + return err; + } + + return 0; +} + /* * Set up the block and inode bitmaps, and the inode table for the new group. * This doesn't need to be part of the main transaction, since we are only @@ -162,8 +188,9 @@ static int setup_new_group_blocks(struct super_block *sb, int i; int err = 0, err2; - handle = ext4_journal_start_sb(sb, reserved_gdb + gdblocks + - 2 + sbi->s_itb_per_group); + /* This transaction may be extended/restarted along the way */ + handle = ext4_journal_start_sb(sb, EXT4_MAX_TRANS_DATA); + if (IS_ERR(handle)) return PTR_ERR(handle); @@ -190,6 +217,9 @@ static int setup_new_group_blocks(struct super_block *sb, ext4_debug("update backup group %#04lx (+%d)\n", block, bit); + if ((err = extend_or_restart_transaction(handle, 1, bh))) + goto exit_bh; + gdb = sb_getblk(sb, block); if (!gdb) { err = -EIO; @@ -215,6 +245,9 @@ static int setup_new_group_blocks(struct super_block *sb, ext4_debug("clear reserved block %#04lx (+%d)\n", block, bit); + if ((err = extend_or_restart_transaction(handle, 1, bh))) + goto exit_bh; + if (IS_ERR(gdb = bclean(handle, sb, block))) { err = PTR_ERR(bh); goto exit_bh; @@ -236,6 +269,10 @@ static int setup_new_group_blocks(struct super_block *sb, struct buffer_head *it; ext4_debug("clear inode block %#04lx (+%d)\n", block, bit); + + if ((err = extend_or_restart_transaction(handle, 1, bh))) + goto exit_bh; + if (IS_ERR(it = bclean(handle, sb, block))) { err = PTR_ERR(it); goto exit_bh; @@ -244,6 +281,10 @@ static int setup_new_group_blocks(struct super_block *sb, brelse(it); ext4_set_bit(bit, bh->b_data); } + + if ((err = extend_or_restart_transaction(handle, 2, bh))) + goto exit_bh; + mark_bitmap_end(input->blocks_count, EXT4_BLOCKS_PER_GROUP(sb), bh->b_data); ext4_journal_dirty_metadata(handle, bh); @@ -271,7 +312,6 @@ exit_journal: return err; } - /* * Iterate through the groups which hold BACKUP superblock/GDT copies in an * ext4 filesystem. The counters should be initialized to 1, 5, and 7 before -- 2.41.1