diff options
-rw-r--r-- | fs/xfs/libxfs/xfs_ag.c | 70 | ||||
-rw-r--r-- | fs/xfs/libxfs/xfs_ag.h | 31 | ||||
-rw-r--r-- | fs/xfs/scrub/bmap.c | 2 | ||||
-rw-r--r-- | fs/xfs/scrub/fscounters.c | 4 | ||||
-rw-r--r-- | fs/xfs/xfs_fsmap.c | 4 | ||||
-rw-r--r-- | fs/xfs/xfs_icache.c | 2 | ||||
-rw-r--r-- | fs/xfs/xfs_iwalk.c | 6 | ||||
-rw-r--r-- | fs/xfs/xfs_reflink.c | 2 | ||||
-rw-r--r-- | fs/xfs/xfs_trace.h | 3 |
9 files changed, 105 insertions, 19 deletions
diff --git a/fs/xfs/libxfs/xfs_ag.c b/fs/xfs/libxfs/xfs_ag.c index bb0c700afe3c..46e25c682bf4 100644 --- a/fs/xfs/libxfs/xfs_ag.c +++ b/fs/xfs/libxfs/xfs_ag.c @@ -95,6 +95,68 @@ xfs_perag_put( } /* + * Active references for perag structures. This is for short term access to the + * per ag structures for walking trees or accessing state. If an AG is being + * shrunk or is offline, then this will fail to find that AG and return NULL + * instead. + */ +struct xfs_perag * +xfs_perag_grab( + struct xfs_mount *mp, + xfs_agnumber_t agno) +{ + struct xfs_perag *pag; + + rcu_read_lock(); + pag = radix_tree_lookup(&mp->m_perag_tree, agno); + if (pag) { + trace_xfs_perag_grab(mp, pag->pag_agno, + atomic_read(&pag->pag_active_ref), _RET_IP_); + if (!atomic_inc_not_zero(&pag->pag_active_ref)) + pag = NULL; + } + rcu_read_unlock(); + return pag; +} + +/* + * search from @first to find the next perag with the given tag set. + */ +struct xfs_perag * +xfs_perag_grab_tag( + struct xfs_mount *mp, + xfs_agnumber_t first, + int tag) +{ + struct xfs_perag *pag; + int found; + + rcu_read_lock(); + found = radix_tree_gang_lookup_tag(&mp->m_perag_tree, + (void **)&pag, first, 1, tag); + if (found <= 0) { + rcu_read_unlock(); + return NULL; + } + trace_xfs_perag_grab_tag(mp, pag->pag_agno, + atomic_read(&pag->pag_active_ref), _RET_IP_); + if (!atomic_inc_not_zero(&pag->pag_active_ref)) + pag = NULL; + rcu_read_unlock(); + return pag; +} + +void +xfs_perag_rele( + struct xfs_perag *pag) +{ + trace_xfs_perag_rele(pag->pag_mount, pag->pag_agno, + atomic_read(&pag->pag_active_ref), _RET_IP_); + if (atomic_dec_and_test(&pag->pag_active_ref)) + wake_up(&pag->pag_active_wq); +} + +/* * xfs_initialize_perag_data * * Read in each per-ag structure so we can count up the number of @@ -196,6 +258,10 @@ xfs_free_perag( cancel_delayed_work_sync(&pag->pag_blockgc_work); xfs_buf_hash_destroy(pag); + /* drop the mount's active reference */ + xfs_perag_rele(pag); + XFS_IS_CORRUPT(pag->pag_mount, + atomic_read(&pag->pag_active_ref) != 0); call_rcu(&pag->rcu_head, __xfs_free_perag); } } @@ -314,6 +380,7 @@ xfs_initialize_perag( INIT_DELAYED_WORK(&pag->pag_blockgc_work, xfs_blockgc_worker); INIT_RADIX_TREE(&pag->pag_ici_root, GFP_ATOMIC); init_waitqueue_head(&pag->pagb_wait); + init_waitqueue_head(&pag->pag_active_wq); pag->pagb_count = 0; pag->pagb_tree = RB_ROOT; #endif /* __KERNEL__ */ @@ -322,6 +389,9 @@ xfs_initialize_perag( if (error) goto out_remove_pag; + /* Active ref owned by mount indicates AG is online. */ + atomic_set(&pag->pag_active_ref, 1); + /* first new pag is fully initialized */ if (first_initialised == NULLAGNUMBER) first_initialised = index; diff --git a/fs/xfs/libxfs/xfs_ag.h b/fs/xfs/libxfs/xfs_ag.h index 191b22b9a35b..aeb21c8df201 100644 --- a/fs/xfs/libxfs/xfs_ag.h +++ b/fs/xfs/libxfs/xfs_ag.h @@ -32,7 +32,9 @@ struct xfs_ag_resv { struct xfs_perag { struct xfs_mount *pag_mount; /* owner filesystem */ xfs_agnumber_t pag_agno; /* AG this structure belongs to */ - atomic_t pag_ref; /* perag reference count */ + atomic_t pag_ref; /* passive reference count */ + atomic_t pag_active_ref; /* active reference count */ + wait_queue_head_t pag_active_wq;/* woken active_ref falls to zero */ char pagf_init; /* this agf's entry is initialized */ char pagi_init; /* this agi's entry is initialized */ char pagf_metadata; /* the agf is preferred to be metadata */ @@ -111,11 +113,18 @@ int xfs_initialize_perag(struct xfs_mount *mp, xfs_agnumber_t agcount, int xfs_initialize_perag_data(struct xfs_mount *mp, xfs_agnumber_t agno); void xfs_free_perag(struct xfs_mount *mp); +/* Passive AG references */ struct xfs_perag *xfs_perag_get(struct xfs_mount *mp, xfs_agnumber_t agno); struct xfs_perag *xfs_perag_get_tag(struct xfs_mount *mp, xfs_agnumber_t agno, unsigned int tag); void xfs_perag_put(struct xfs_perag *pag); +/* Active AG references */ +struct xfs_perag *xfs_perag_grab(struct xfs_mount *, xfs_agnumber_t); +struct xfs_perag *xfs_perag_grab_tag(struct xfs_mount *, xfs_agnumber_t, + int tag); +void xfs_perag_rele(struct xfs_perag *pag); + /* * Per-ag geometry infomation and validation */ @@ -193,14 +202,18 @@ xfs_perag_next( struct xfs_mount *mp = pag->pag_mount; *agno = pag->pag_agno + 1; - xfs_perag_put(pag); - if (*agno > end_agno) - return NULL; - return xfs_perag_get(mp, *agno); + xfs_perag_rele(pag); + while (*agno <= end_agno) { + pag = xfs_perag_grab(mp, *agno); + if (pag) + return pag; + (*agno)++; + } + return NULL; } #define for_each_perag_range(mp, agno, end_agno, pag) \ - for ((pag) = xfs_perag_get((mp), (agno)); \ + for ((pag) = xfs_perag_grab((mp), (agno)); \ (pag) != NULL; \ (pag) = xfs_perag_next((pag), &(agno), (end_agno))) @@ -213,11 +226,11 @@ xfs_perag_next( for_each_perag_from((mp), (agno), (pag)) #define for_each_perag_tag(mp, agno, pag, tag) \ - for ((agno) = 0, (pag) = xfs_perag_get_tag((mp), 0, (tag)); \ + for ((agno) = 0, (pag) = xfs_perag_grab_tag((mp), 0, (tag)); \ (pag) != NULL; \ (agno) = (pag)->pag_agno + 1, \ - xfs_perag_put(pag), \ - (pag) = xfs_perag_get_tag((mp), (agno), (tag))) + xfs_perag_rele(pag), \ + (pag) = xfs_perag_grab_tag((mp), (agno), (tag))) struct aghdr_init_data { /* per ag data */ diff --git a/fs/xfs/scrub/bmap.c b/fs/xfs/scrub/bmap.c index d50d0eab196a..dbbc7037074c 100644 --- a/fs/xfs/scrub/bmap.c +++ b/fs/xfs/scrub/bmap.c @@ -662,7 +662,7 @@ xchk_bmap_check_rmaps( error = xchk_bmap_check_ag_rmaps(sc, whichfork, pag); if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)) { - xfs_perag_put(pag); + xfs_perag_rele(pag); return error; } } diff --git a/fs/xfs/scrub/fscounters.c b/fs/xfs/scrub/fscounters.c index 4777e7b89fdc..ef97670970c3 100644 --- a/fs/xfs/scrub/fscounters.c +++ b/fs/xfs/scrub/fscounters.c @@ -117,7 +117,7 @@ xchk_fscount_warmup( if (agi_bp) xfs_buf_relse(agi_bp); if (pag) - xfs_perag_put(pag); + xfs_perag_rele(pag); return error; } @@ -249,7 +249,7 @@ retry: } if (pag) - xfs_perag_put(pag); + xfs_perag_rele(pag); if (error) { xchk_set_incomplete(sc); return error; diff --git a/fs/xfs/xfs_fsmap.c b/fs/xfs/xfs_fsmap.c index 88a88506ffff..120d284a03fe 100644 --- a/fs/xfs/xfs_fsmap.c +++ b/fs/xfs/xfs_fsmap.c @@ -688,11 +688,11 @@ __xfs_getfsmap_datadev( info->agf_bp = NULL; } if (info->pag) { - xfs_perag_put(info->pag); + xfs_perag_rele(info->pag); info->pag = NULL; } else if (pag) { /* loop termination case */ - xfs_perag_put(pag); + xfs_perag_rele(pag); } return error; diff --git a/fs/xfs/xfs_icache.c b/fs/xfs/xfs_icache.c index ddeaccc04aec..0f4a014dded3 100644 --- a/fs/xfs/xfs_icache.c +++ b/fs/xfs/xfs_icache.c @@ -1767,7 +1767,7 @@ xfs_icwalk( if (error) { last_error = error; if (error == -EFSCORRUPTED) { - xfs_perag_put(pag); + xfs_perag_rele(pag); break; } } diff --git a/fs/xfs/xfs_iwalk.c b/fs/xfs/xfs_iwalk.c index 7558486f4937..c31857d903a4 100644 --- a/fs/xfs/xfs_iwalk.c +++ b/fs/xfs/xfs_iwalk.c @@ -591,7 +591,7 @@ xfs_iwalk( } if (iwag.pag) - xfs_perag_put(pag); + xfs_perag_rele(pag); xfs_iwalk_free(&iwag); return error; } @@ -683,7 +683,7 @@ xfs_iwalk_threaded( break; } if (pag) - xfs_perag_put(pag); + xfs_perag_rele(pag); if (polled) xfs_pwork_poll(&pctl); return xfs_pwork_destroy(&pctl); @@ -776,7 +776,7 @@ xfs_inobt_walk( } if (iwag.pag) - xfs_perag_put(pag); + xfs_perag_rele(pag); xfs_iwalk_free(&iwag); return error; } diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c index 57bf59ff4854..f5dc46ce9803 100644 --- a/fs/xfs/xfs_reflink.c +++ b/fs/xfs/xfs_reflink.c @@ -927,7 +927,7 @@ xfs_reflink_recover_cow( for_each_perag(mp, agno, pag) { error = xfs_refcount_recover_cow_leftovers(mp, pag); if (error) { - xfs_perag_put(pag); + xfs_perag_rele(pag); break; } } diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h index 2ac98d8ddbfd..eb5e49d44f13 100644 --- a/fs/xfs/xfs_trace.h +++ b/fs/xfs/xfs_trace.h @@ -189,6 +189,9 @@ DEFINE_EVENT(xfs_perag_class, name, \ DEFINE_PERAG_REF_EVENT(xfs_perag_get); DEFINE_PERAG_REF_EVENT(xfs_perag_get_tag); DEFINE_PERAG_REF_EVENT(xfs_perag_put); +DEFINE_PERAG_REF_EVENT(xfs_perag_grab); +DEFINE_PERAG_REF_EVENT(xfs_perag_grab_tag); +DEFINE_PERAG_REF_EVENT(xfs_perag_rele); DEFINE_PERAG_REF_EVENT(xfs_perag_set_inode_tag); DEFINE_PERAG_REF_EVENT(xfs_perag_clear_inode_tag); |