diff options
Diffstat (limited to 'fs/xfs/xfs_mount.c')
| -rw-r--r-- | fs/xfs/xfs_mount.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c index f241fec26070..049dbc71c28e 100644 --- a/fs/xfs/xfs_mount.c +++ b/fs/xfs/xfs_mount.c @@ -201,6 +201,38 @@ xfs_uuid_unmount( /* + * Reference counting access wrappers to the perag structures. + */ +struct xfs_perag * +xfs_perag_get(struct xfs_mount *mp, xfs_agnumber_t agno) +{ + struct xfs_perag *pag; + int ref = 0; + + spin_lock(&mp->m_perag_lock); + pag = radix_tree_lookup(&mp->m_perag_tree, agno); + if (pag) { + ASSERT(atomic_read(&pag->pag_ref) >= 0); + /* catch leaks in the positive direction during testing */ + ASSERT(atomic_read(&pag->pag_ref) < 1000); + ref = atomic_inc_return(&pag->pag_ref); + } + spin_unlock(&mp->m_perag_lock); + trace_xfs_perag_get(mp, agno, ref, _RET_IP_); + return pag; +} + +void +xfs_perag_put(struct xfs_perag *pag) +{ + int ref; + + ASSERT(atomic_read(&pag->pag_ref) > 0); + ref = atomic_dec_return(&pag->pag_ref); + trace_xfs_perag_put(pag->pag_mount, pag->pag_agno, ref, _RET_IP_); +} + +/* * Free up the resources associated with a mount structure. Assume that * the structure was initially zeroed, so we can tell which fields got * initialized. @@ -433,6 +465,8 @@ xfs_initialize_perag( kmem_free(pag); return -EEXIST; } + pag->pag_agno = index; + pag->pag_mount = mp; spin_unlock(&mp->m_perag_lock); radix_tree_preload_end(); } |