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author | Dave Chinner <david@fromorbit.com> | 2010-01-11 11:47:46 (GMT) |
---|---|---|
committer | Alex Elder <aelder@sgi.com> | 2010-01-15 21:34:12 (GMT) |
commit | 0fa800fbd549736dfdc1d7761f87e33dc8cd973b (patch) | |
tree | 3940f2f5bc4bb3bec888f7ef9ed8a8c875e02695 /fs/xfs/xfs_mount.c | |
parent | aed3bb90abaf0b42e8c8747e192f7bb97f445279 (diff) | |
download | linux-0fa800fbd549736dfdc1d7761f87e33dc8cd973b.tar.xz |
xfs: Add trace points for per-ag refcount debugging.
Uninline xfs_perag_{get,put} so that tracepoints can be inserted
into them to speed debugging of reference count problems.
Signed-off-by: Dave Chinner <david@fromorbit.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>
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 f241fec..049dbc7 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(); } |