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ext4: add checksum calculation when clearing UNINIT flag in ext4_new_inode

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When initializing an uninitialized block group in ext4_new_inode(),
its block group checksum must be re-calculated.  This fixes a race
when several threads try to allocate a new inode in an UNINIT'd group.

There is some question whether we need to be initializing the block
bitmap in ext4_new_inode() at all, but for now, if we are going to
init the block group, let's eliminate the race.

Signed-off-by: Frederic Bohe <frederic.bohe@bull.net>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Frederic Bohe 2008-11-07 09:21:01 -05:00 committed by Theodore Ts'o
parent ed9b3e3379
commit 23712a9c28
1 changed files with 2 additions and 0 deletions
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2
fs/ext4/ialloc.c
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@ -718,6 +718,8 @@ struct inode *ext4_new_inode(handle_t *handle, struct inode *dir, int mode)
gdp->bg_flags &= cpu_to_le16(~EXT4_BG_BLOCK_UNINIT);
free = ext4_free_blocks_after_init(sb, group, gdp);
gdp->bg_free_blocks_count = cpu_to_le16(free);
gdp->bg_checksum = ext4_group_desc_csum(sbi, group,
gdp);
}
spin_unlock(sb_bgl_lock(sbi, group));