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authorJan Kara <jack@suse.cz>2012-11-13 18:25:38 +0100
committerJan Kara <jack@suse.cz>2012-11-19 21:34:33 +0100
commit361d94a338a3fd0cee6a4ea32bbc427ba228e628 (patch)
treeb6d47973fada0c3cdd633b292772e19679a4f2f2
parentb9e06ef2e8706fe669b51f4364e3aeed58639eb2 (diff)
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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>
-rw-r--r--fs/reiserfs/super.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/reiserfs/super.c b/fs/reiserfs/super.c
index e59d6ddcc69..c101704ece4 100644
--- a/fs/reiserfs/super.c
+++ b/fs/reiserfs/super.c
@@ -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;