From: Jan Kara Date: Tue, 13 Nov 2012 17:25:38 +0000 (+0100) Subject: reiserfs: Protect reiserfs_quota_write() with write lock X-Git-Tag: firefly_0821_release~7541^2~298 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=7eebd4fb8bac3b4b69783e9333cf6e383376702d;p=firefly-linux-kernel-4.4.55.git reiserfs: Protect reiserfs_quota_write() with write lock commit 361d94a338a3fd0cee6a4ea32bbc427ba228e628 upstream. 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. Signed-off-by: Jan Kara Signed-off-by: Greg Kroah-Hartman --- diff --git a/fs/reiserfs/super.c b/fs/reiserfs/super.c index 1c677aade713..752762309115 100644 --- a/fs/reiserfs/super.c +++ b/fs/reiserfs/super.c @@ -2205,7 +2205,9 @@ 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) @@ -2221,10 +2223,12 @@ 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;