[PATCH v2 01/15] ext4: add a function which extends a group without checking parameters
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STALE5448d
From: Yongqiang Yang <hidden>
Date: 2011-08-30 08:53:45
Subsystem:
ext4 file system, filesystems (vfs and infrastructure), the rest · Maintainers:
"Theodore Ts'o", Alexander Viro, Christian Brauner, Linus Torvalds
This patch added a function named __ext4_group_extend() whose code is copied from ext4_group_extend(). __ext4_group_extend() assumes the parameter is valid and has been checked by caller. __ext4_group_extend() will be used by new resize implementation. It can also be used by ext4_group_extend(), but this patch series does not do this. Signed-off-by: Yongqiang Yang <redacted> --- fs/ext4/resize.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 53 insertions(+), 0 deletions(-)
diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index 707d3f1..5126aac 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c@@ -969,6 +969,59 @@ exit_put: } /* ext4_group_add */ /* + * extend a group without checking assuming that checking has been done. + */ +static int __ext4_group_extend(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); + goto out; + } + + err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh); + if (err) { + ext4_warning(sb, "error %d on journal write access", err); + ext4_journal_stop(handle); + goto out; + } + + 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 exit_journal; + ext4_handle_dirty_super(handle, sb); + ext4_debug("freed blocks %llu through %llu\n", o_blocks_count, + o_blocks_count + add); +exit_journal: + 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)); + } +out: + 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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1.7.5.1