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authorYongqiang Yang <xiaoqiangnk@gmail.com>2012-01-03 23:18:50 -0500
committerTheodore Ts'o <tytso@mit.edu>2012-01-03 23:18:50 -0500
commit18e3143848f1abdd07e7d9879cf67f4e147ff8b7 (patch)
treea2f76cfff641ed9246ea8e9bd7442c791b75ae09 /fs/ext4/resize.c
parent597d508c17a6dcd17770f4dd9da873d93cc15493 (diff)
downloadop-kernel-dev-18e3143848f1abdd07e7d9879cf67f4e147ff8b7.zip
op-kernel-dev-18e3143848f1abdd07e7d9879cf67f4e147ff8b7.tar.gz
ext4: add a function which extends a group without checking parameters
This patch added a function named ext4_group_extend_no_check() whose code is copied from ext4_group_extend(). ext4_group_extend_no_check() assumes the parameter is valid and has been checked by caller. Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/resize.c')
-rw-r--r--fs/ext4/resize.c51
1 files changed, 51 insertions, 0 deletions
diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index 996780a..1c3c2b5 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -969,6 +969,57 @@ exit_put:
} /* ext4_group_add */
/*
+ * extend a group without checking assuming that checking has been done.
+ */
+static int ext4_group_extend_no_check(struct super_block *sb,
+ ext4_fsblk_t o_blocks_count, ext4_grpblk_t add)
+{
+ struct ext4_super_block *es = EXT4_SB(sb)->s_es;
+ handle_t *handle;
+ int err = 0, err2;
+
+ /* We will update the superblock, one block bitmap, and
+ * one group descriptor via ext4_group_add_blocks().
+ */
+ handle = ext4_journal_start_sb(sb, 3);
+ if (IS_ERR(handle)) {
+ err = PTR_ERR(handle);
+ ext4_warning(sb, "error %d on journal start", err);
+ return err;
+ }
+
+ err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh);
+ if (err) {
+ ext4_warning(sb, "error %d on journal write access", err);
+ goto errout;
+ }
+
+ ext4_blocks_count_set(es, o_blocks_count + add);
+ ext4_debug("freeing blocks %llu through %llu\n", o_blocks_count,
+ o_blocks_count + add);
+ /* We add the blocks to the bitmap and set the group need init bit */
+ err = ext4_group_add_blocks(handle, sb, o_blocks_count, add);
+ if (err)
+ goto errout;
+ ext4_handle_dirty_super(handle, sb);
+ ext4_debug("freed blocks %llu through %llu\n", o_blocks_count,
+ o_blocks_count + add);
+errout:
+ err2 = ext4_journal_stop(handle);
+ if (err2 && !err)
+ err = err2;
+
+ if (!err) {
+ if (test_opt(sb, DEBUG))
+ printk(KERN_DEBUG "EXT4-fs: extended group to %llu "
+ "blocks\n", ext4_blocks_count(es));
+ update_backups(sb, EXT4_SB(sb)->s_sbh->b_blocknr, (char *)es,
+ sizeof(struct ext4_super_block));
+ }
+ return err;
+}
+
+/*
* Extend the filesystem to the new number of blocks specified. This entry
* point is only used to extend the current filesystem to the end of the last
* existing group. It can be accessed via ioctl, or by "remount,resize=<size>"
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