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reiserfs: Protect reiserfs_quota_write() with write lock 

Calls into reiserfs journalling code and reiserfs_get_block() need to
be protected with write lock. We remove write lock around calls to high
level quota code in the next patch so these paths would suddently become
unprotected.

CC: stable@vger.kernel.org # >= 3.0
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara 2012-11-13 18:25:38 +01:00
parent b9e06ef2e8
commit 361d94a338
1 changed files with 4 additions and 0 deletions
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4
fs/reiserfs/super.c
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@ -2338,7 +2338,9 @@ static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
tocopy = sb->s_blocksize - offset < towrite ?
sb->s_blocksize - offset : towrite;
tmp_bh.b_state = 0;
reiserfs_write_lock(sb);
err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
reiserfs_write_unlock(sb);
if (err)
goto out;
if (offset || tocopy != sb->s_blocksize)
@ -2354,10 +2356,12 @@ static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
flush_dcache_page(bh->b_page);
set_buffer_uptodate(bh);
unlock_buffer(bh);
reiserfs_write_lock(sb);
reiserfs_prepare_for_journal(sb, bh, 1);
journal_mark_dirty(current->journal_info, sb, bh);
if (!journal_quota)
reiserfs_add_ordered_list(inode, bh);
reiserfs_write_unlock(sb);
brelse(bh);
offset = 0;
towrite -= tocopy;