xfs: avoid memory allocation under m_peraglock in growfs code

Allocate the memory for the larger m_perag array before taking the
per-AG lock as the per-AG lock can be taken under the i_lock which
can be taken from reclaim context.

Reported by the new reclaim context tracing in lockdep.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Felix Blyakher <felixb@sgi.com>
Signed-off-by: Felix Blyakher <felixb@sgi.com>

diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
index cbd451b..2d0b3e1 100644 (file)
--- a/fs/xfs/xfs_fsops.c
+++ b/fs/xfs/xfs_fsops.c
@@ -167,17 +167,25 @@ xfs_growfs_data_private(
        new = nb - mp->m_sb.sb_dblocks;
        oagcount = mp->m_sb.sb_agcount;
        if (nagcount > oagcount) {
+               void *new_perag, *old_perag;
+
                xfs_filestream_flush(mp);
+
+               new_perag = kmem_zalloc(sizeof(xfs_perag_t) * nagcount,
+                                       KM_MAYFAIL);
+               if (!new_perag)
+                       return XFS_ERROR(ENOMEM);
+
                down_write(&mp->m_peraglock);
-               mp->m_perag = kmem_realloc(mp->m_perag,
-                       sizeof(xfs_perag_t) * nagcount,
-                       sizeof(xfs_perag_t) * oagcount,
-                       KM_SLEEP);
-               memset(&mp->m_perag[oagcount], 0,
-                       (nagcount - oagcount) * sizeof(xfs_perag_t));
+               memcpy(new_perag, mp->m_perag, sizeof(xfs_perag_t) * oagcount);
+               old_perag = mp->m_perag;
+               mp->m_perag = new_perag;
+
                mp->m_flags |= XFS_MOUNT_32BITINODES;
                nagimax = xfs_initialize_perag(mp, nagcount);
                up_write(&mp->m_peraglock);
+
+               kmem_free(old_perag);
        }
        tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS);
        tp->t_flags |= XFS_TRANS_RESERVE;