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authorYongqiang Yang <xiaoqiangnk@gmail.com>2011-07-26 22:24:41 -0400
committerTheodore Ts'o <tytso@mit.edu>2011-07-26 22:24:41 -0400
commit6d40bc5a7e8fc71795d131e835f38f161ed7e1b1 (patch)
treed66d509a10509bc09d8dc0ecdc4641b585c1bfa0 /fs
parentc3e94d1df9bdd9e2c4ba7e8f534f7925f1756f97 (diff)
downloadop-kernel-dev-6d40bc5a7e8fc71795d131e835f38f161ed7e1b1.zip
op-kernel-dev-6d40bc5a7e8fc71795d131e835f38f161ed7e1b1.tar.gz
ext4: simplify journal handling in setup_new_group_blocks()
This patch simplifies journal handling in setup_new_group_blocks(). In previous code, block bitmap is modified everywhere in setup_new_group_blocks(), ext4_get_write_access() in extend_or_restart_transaction() is used to guarantee that the block bitmap stays in the new handle, this makes things complicated. The previous commit changed things so that the modifications on the block bitmap are batched and done by ext4_set_bits() at the end of the for loop. This allows us to simplify things. Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs')
-rw-r--r--fs/ext4/resize.c39
1 files changed, 20 insertions, 19 deletions
diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index 178fb2f..5b423f8 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -161,8 +161,7 @@ static struct buffer_head *bclean(handle_t *handle, struct super_block *sb,
* 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)
+static int extend_or_restart_transaction(handle_t *handle, int thresh)
{
int err;
@@ -173,9 +172,8 @@ static int extend_or_restart_transaction(handle_t *handle, int thresh,
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)))
+ err = ext4_journal_restart(handle, EXT4_MAX_TRANS_DATA);
+ if (err)
return err;
}
@@ -212,29 +210,24 @@ static int setup_new_group_blocks(struct super_block *sb,
BUG_ON(input->group != sbi->s_groups_count);
- if (IS_ERR(bh = bclean(handle, sb, input->block_bitmap))) {
- err = PTR_ERR(bh);
- goto exit_journal;
- }
-
/* Copy all of the GDT blocks into the backup in this group */
for (i = 0, bit = 1, block = start + 1;
i < gdblocks; i++, block++, bit++) {
struct buffer_head *gdb;
ext4_debug("update backup group %#04llx (+%d)\n", block, bit);
-
- if ((err = extend_or_restart_transaction(handle, 1, bh)))
- goto exit_bh;
+ err = extend_or_restart_transaction(handle, 1);
+ if (err)
+ goto exit_journal;
gdb = sb_getblk(sb, block);
if (!gdb) {
err = -EIO;
- goto exit_bh;
+ goto exit_journal;
}
if ((err = ext4_journal_get_write_access(handle, gdb))) {
brelse(gdb);
- goto exit_bh;
+ goto exit_journal;
}
lock_buffer(gdb);
memcpy(gdb->b_data, sbi->s_group_desc[i]->b_data, gdb->b_size);
@@ -243,7 +236,7 @@ static int setup_new_group_blocks(struct super_block *sb,
err = ext4_handle_dirty_metadata(handle, NULL, gdb);
if (unlikely(err)) {
brelse(gdb);
- goto exit_bh;
+ goto exit_journal;
}
brelse(gdb);
}
@@ -254,7 +247,17 @@ static int setup_new_group_blocks(struct super_block *sb,
err = sb_issue_zeroout(sb, gdblocks + start + 1, reserved_gdb,
GFP_NOFS);
if (err)
- goto exit_bh;
+ goto exit_journal;
+
+ err = extend_or_restart_transaction(handle, 2);
+ if (err)
+ goto exit_journal;
+
+ bh = bclean(handle, sb, input->block_bitmap);
+ if (IS_ERR(bh)) {
+ err = PTR_ERR(bh);
+ goto exit_journal;
+ }
if (ext4_bg_has_super(sb, input->group)) {
ext4_debug("mark backup group tables %#04llx (+0)\n", start);
@@ -278,8 +281,6 @@ static int setup_new_group_blocks(struct super_block *sb,
ext4_set_bits(bh->b_data, input->inode_table - start,
sbi->s_itb_per_group);
- if ((err = extend_or_restart_transaction(handle, 2, bh)))
- goto exit_bh;
ext4_mark_bitmap_end(input->blocks_count, sb->s_blocksize * 8,
bh->b_data);
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