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-rw-r--r--module/zfs/dmu_traverse.c275
1 files changed, 98 insertions, 177 deletions
diff --git a/module/zfs/dmu_traverse.c b/module/zfs/dmu_traverse.c
index d262de7d1..998cb4b6a 100644
--- a/module/zfs/dmu_traverse.c
+++ b/module/zfs/dmu_traverse.c
@@ -59,31 +59,6 @@ typedef struct traverse_data {
void *td_arg;
} traverse_data_t;
-typedef struct traverse_visitbp_data {
- /* Function arguments */
- traverse_data_t *tv_td;
- const dnode_phys_t *tv_dnp;
- arc_buf_t *tv_pbuf;
- blkptr_t *tv_bp;
- const zbookmark_t *tv_zb;
- /* Local variables */
- prefetch_data_t *tv_pd;
- zbookmark_t tv_czb;
- arc_buf_t *tv_buf;
- boolean_t tv_hard;
- objset_phys_t *tv_osp;
- dnode_phys_t *tv_ldnp;
- blkptr_t *tv_cbp;
- uint32_t tv_flags;
- int tv_err;
- int tv_lasterr;
- int tv_i;
- int tv_epb;
- int tv_depth;
-} traverse_visitbp_data_t;
-
-static inline int traverse_visitbp(traverse_data_t *td, const
- dnode_phys_t *dnp, arc_buf_t *pbuf, blkptr_t *bp, const zbookmark_t *zb);
static int traverse_dnode(traverse_data_t *td, const dnode_phys_t *dnp,
arc_buf_t *buf, uint64_t objset, uint64_t object);
@@ -153,191 +128,137 @@ traverse_zil(traverse_data_t *td, zil_header_t *zh)
zil_free(zilog);
}
-#define TRAVERSE_VISITBP_MAX_DEPTH 20
-
-static void
-__traverse_visitbp_init(traverse_visitbp_data_t *tv,
- traverse_data_t *td, const dnode_phys_t *dnp,
- arc_buf_t *pbuf, blkptr_t *bp, const zbookmark_t *zb, int depth)
-{
- tv->tv_td = td;
- tv->tv_dnp = dnp;
- tv->tv_pbuf = pbuf;
- tv->tv_bp = bp;
- tv->tv_zb = zb;
- tv->tv_err = 0;
- tv->tv_lasterr = 0;
- tv->tv_buf = NULL;
- tv->tv_pd = td->td_pfd;
- tv->tv_hard = td->td_flags & TRAVERSE_HARD;
- tv->tv_flags = ARC_WAIT;
- tv->tv_depth = depth;
-}
-
-static noinline int
-__traverse_visitbp(traverse_visitbp_data_t *tv)
+static int
+traverse_visitbp(traverse_data_t *td, const dnode_phys_t *dnp,
+ arc_buf_t *pbuf, blkptr_t *bp, const zbookmark_t *zb)
{
- ASSERT3S(tv->tv_depth, <, TRAVERSE_VISITBP_MAX_DEPTH);
+ zbookmark_t czb;
+ int err = 0, lasterr = 0;
+ arc_buf_t *buf = NULL;
+ prefetch_data_t *pd = td->td_pfd;
+ boolean_t hard = td->td_flags & TRAVERSE_HARD;
- if (tv->tv_bp->blk_birth == 0) {
- tv->tv_err = tv->tv_td->td_func(tv->tv_td->td_spa, NULL, NULL,
- tv->tv_pbuf, tv->tv_zb, tv->tv_dnp, tv->tv_td->td_arg);
- return (tv->tv_err);
+ if (bp->blk_birth == 0) {
+ err = td->td_func(td->td_spa, NULL, NULL, pbuf, zb, dnp,
+ td->td_arg);
+ return (err);
}
- if (tv->tv_bp->blk_birth <= tv->tv_td->td_min_txg)
+ if (bp->blk_birth <= td->td_min_txg)
return (0);
- if (tv->tv_pd && !tv->tv_pd->pd_exited &&
- ((tv->tv_pd->pd_flags & TRAVERSE_PREFETCH_DATA) ||
- BP_GET_TYPE(tv->tv_bp) == DMU_OT_DNODE ||
- BP_GET_LEVEL(tv->tv_bp) > 0)) {
- mutex_enter(&tv->tv_pd->pd_mtx);
- ASSERT(tv->tv_pd->pd_blks_fetched >= 0);
- while (tv->tv_pd->pd_blks_fetched == 0 && !tv->tv_pd->pd_exited)
- cv_wait(&tv->tv_pd->pd_cv, &tv->tv_pd->pd_mtx);
- tv->tv_pd->pd_blks_fetched--;
- cv_broadcast(&tv->tv_pd->pd_cv);
- mutex_exit(&tv->tv_pd->pd_mtx);
+ if (pd && !pd->pd_exited &&
+ ((pd->pd_flags & TRAVERSE_PREFETCH_DATA) ||
+ BP_GET_TYPE(bp) == DMU_OT_DNODE || BP_GET_LEVEL(bp) > 0)) {
+ mutex_enter(&pd->pd_mtx);
+ ASSERT(pd->pd_blks_fetched >= 0);
+ while (pd->pd_blks_fetched == 0 && !pd->pd_exited)
+ cv_wait(&pd->pd_cv, &pd->pd_mtx);
+ pd->pd_blks_fetched--;
+ cv_broadcast(&pd->pd_cv);
+ mutex_exit(&pd->pd_mtx);
}
- if (tv->tv_td->td_flags & TRAVERSE_PRE) {
- tv->tv_err = tv->tv_td->td_func(tv->tv_td->td_spa, NULL,
- tv->tv_bp, tv->tv_pbuf, tv->tv_zb, tv->tv_dnp,
- tv->tv_td->td_arg);
- if (tv->tv_err == TRAVERSE_VISIT_NO_CHILDREN)
+ if (td->td_flags & TRAVERSE_PRE) {
+ err = td->td_func(td->td_spa, NULL, bp, pbuf, zb, dnp,
+ td->td_arg);
+ if (err == TRAVERSE_VISIT_NO_CHILDREN)
return (0);
- if (tv->tv_err)
- return (tv->tv_err);
+ if (err)
+ return (err);
}
- if (BP_GET_LEVEL(tv->tv_bp) > 0) {
- tv->tv_epb = BP_GET_LSIZE(tv->tv_bp) >> SPA_BLKPTRSHIFT;
+ if (BP_GET_LEVEL(bp) > 0) {
+ uint32_t flags = ARC_WAIT;
+ int i;
+ blkptr_t *cbp;
+ int epb = BP_GET_LSIZE(bp) >> SPA_BLKPTRSHIFT;
- tv->tv_err = dsl_read(NULL, tv->tv_td->td_spa, tv->tv_bp,
- tv->tv_pbuf, arc_getbuf_func, &tv->tv_buf,
- ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL,
- &tv->tv_flags, tv->tv_zb);
- if (tv->tv_err)
- return (tv->tv_err);
+ err = dsl_read(NULL, td->td_spa, bp, pbuf,
+ arc_getbuf_func, &buf,
+ ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb);
+ if (err)
+ return (err);
/* recursively visitbp() blocks below this */
- tv->tv_cbp = tv->tv_buf->b_data;
- for (tv->tv_i = 0; tv->tv_i < tv->tv_epb;
- tv->tv_i++, tv->tv_cbp++) {
- SET_BOOKMARK(&tv->tv_czb, tv->tv_zb->zb_objset,
- tv->tv_zb->zb_object, tv->tv_zb->zb_level - 1,
- tv->tv_zb->zb_blkid * tv->tv_epb + tv->tv_i);
- __traverse_visitbp_init(tv + 1, tv->tv_td,
- tv->tv_dnp, tv->tv_buf, tv->tv_cbp,
- &tv->tv_czb, tv->tv_depth + 1);
- tv->tv_err = __traverse_visitbp(tv + 1);
- if (tv->tv_err) {
- if (!tv->tv_hard)
+ cbp = buf->b_data;
+ for (i = 0; i < epb; i++, cbp++) {
+ SET_BOOKMARK(&czb, zb->zb_objset, zb->zb_object,
+ zb->zb_level - 1,
+ zb->zb_blkid * epb + i);
+ err = traverse_visitbp(td, dnp, buf, cbp, &czb);
+ if (err) {
+ if (!hard)
break;
- tv->tv_lasterr = tv->tv_err;
+ lasterr = err;
}
}
- } else if (BP_GET_TYPE(tv->tv_bp) == DMU_OT_DNODE) {
- tv->tv_epb = BP_GET_LSIZE(tv->tv_bp) >> DNODE_SHIFT;
-
- tv->tv_err = dsl_read(NULL, tv->tv_td->td_spa, tv->tv_bp,
- tv->tv_pbuf, arc_getbuf_func, &tv->tv_buf,
- ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL,
- &tv->tv_flags, tv->tv_zb);
- if (tv->tv_err)
- return (tv->tv_err);
+ } else if (BP_GET_TYPE(bp) == DMU_OT_DNODE) {
+ uint32_t flags = ARC_WAIT;
+ int i;
+ int epb = BP_GET_LSIZE(bp) >> DNODE_SHIFT;
+
+ err = dsl_read(NULL, td->td_spa, bp, pbuf,
+ arc_getbuf_func, &buf,
+ ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb);
+ if (err)
+ return (err);
/* recursively visitbp() blocks below this */
- tv->tv_dnp = tv->tv_buf->b_data;
- for (tv->tv_i = 0; tv->tv_i < tv->tv_epb;
- tv->tv_i++, tv->tv_dnp++) {
- tv->tv_err = traverse_dnode(tv->tv_td, tv->tv_dnp,
- tv->tv_buf, tv->tv_zb->zb_objset,
- tv->tv_zb->zb_blkid * tv->tv_epb + tv->tv_i);
- if (tv->tv_err) {
- if (!tv->tv_hard)
+ dnp = buf->b_data;
+ for (i = 0; i < epb; i++, dnp++) {
+ err = traverse_dnode(td, dnp, buf, zb->zb_objset,
+ zb->zb_blkid * epb + i);
+ if (err) {
+ if (!hard)
break;
- tv->tv_lasterr = tv->tv_err;
+ lasterr = err;
}
}
- } else if (BP_GET_TYPE(tv->tv_bp) == DMU_OT_OBJSET) {
-
- tv->tv_err = dsl_read_nolock(NULL, tv->tv_td->td_spa,
- tv->tv_bp, arc_getbuf_func, &tv->tv_buf,
- ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL,
- &tv->tv_flags, tv->tv_zb);
- if (tv->tv_err)
- return (tv->tv_err);
-
- tv->tv_osp = tv->tv_buf->b_data;
- tv->tv_ldnp = &tv->tv_osp->os_meta_dnode;
- tv->tv_err = traverse_dnode(tv->tv_td, tv->tv_ldnp, tv->tv_buf,
- tv->tv_zb->zb_objset, DMU_META_DNODE_OBJECT);
- if (tv->tv_err && tv->tv_hard) {
- tv->tv_lasterr = tv->tv_err;
- tv->tv_err = 0;
+ } else if (BP_GET_TYPE(bp) == DMU_OT_OBJSET) {
+ uint32_t flags = ARC_WAIT;
+ objset_phys_t *osp;
+ dnode_phys_t *dnp;
+
+ err = dsl_read_nolock(NULL, td->td_spa, bp,
+ arc_getbuf_func, &buf,
+ ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb);
+ if (err)
+ return (err);
+
+ osp = buf->b_data;
+ dnp = &osp->os_meta_dnode;
+ err = traverse_dnode(td, dnp, buf, zb->zb_objset,
+ DMU_META_DNODE_OBJECT);
+ if (err && hard) {
+ lasterr = err;
+ err = 0;
}
- if (tv->tv_err == 0 &&
- arc_buf_size(tv->tv_buf) >= sizeof (objset_phys_t)) {
- tv->tv_ldnp = &tv->tv_osp->os_userused_dnode;
- tv->tv_err = traverse_dnode(tv->tv_td, tv->tv_ldnp,
- tv->tv_buf, tv->tv_zb->zb_objset,
+ if (err == 0 && arc_buf_size(buf) >= sizeof (objset_phys_t)) {
+ dnp = &osp->os_userused_dnode;
+ err = traverse_dnode(td, dnp, buf, zb->zb_objset,
DMU_USERUSED_OBJECT);
}
- if (tv->tv_err && tv->tv_hard) {
- tv->tv_lasterr = tv->tv_err;
- tv->tv_err = 0;
+ if (err && hard) {
+ lasterr = err;
+ err = 0;
}
- if (tv->tv_err == 0 &&
- arc_buf_size(tv->tv_buf) >= sizeof (objset_phys_t)) {
- tv->tv_ldnp = &tv->tv_osp->os_groupused_dnode;
- tv->tv_err = traverse_dnode(tv->tv_td, tv->tv_ldnp,
- tv->tv_buf, tv->tv_zb->zb_objset,
+ if (err == 0 && arc_buf_size(buf) >= sizeof (objset_phys_t)) {
+ dnp = &osp->os_groupused_dnode;
+ err = traverse_dnode(td, dnp, buf, zb->zb_objset,
DMU_GROUPUSED_OBJECT);
}
}
- if (tv->tv_buf)
- (void) arc_buf_remove_ref(tv->tv_buf, &tv->tv_buf);
+ if (buf)
+ (void) arc_buf_remove_ref(buf, &buf);
- if (tv->tv_err == 0 && tv->tv_lasterr == 0 &&
- (tv->tv_td->td_flags & TRAVERSE_POST)) {
- tv->tv_err = tv->tv_td->td_func(tv->tv_td->td_spa, NULL,
- tv->tv_bp, tv->tv_pbuf, tv->tv_zb, tv->tv_dnp,
- tv->tv_td->td_arg);
+ if (err == 0 && lasterr == 0 && (td->td_flags & TRAVERSE_POST)) {
+ err = td->td_func(td->td_spa, NULL, bp, pbuf, zb, dnp,
+ td->td_arg);
}
- return (tv->tv_err != 0 ? tv->tv_err : tv->tv_lasterr);
-}
-
-/*
- * Due to limited stack space recursive functions are frowned upon in
- * the Linux kernel. However, they often are the most elegant solution
- * to a problem. The following code preserves the recursive function
- * traverse_visitbp() but moves the local variables AND function
- * arguments to the heap to minimize the stack frame size. Enough
- * space is initially allocated on the stack for 16 levels of recursion.
- * This change does ugly-up-the-code but it reduces the worst case
- * usage from roughly 2496 bytes to 576 bytes on x86_64 archs.
- */
-static int
-traverse_visitbp(traverse_data_t *td, const dnode_phys_t *dnp,
- arc_buf_t *pbuf, blkptr_t *bp, const zbookmark_t *zb)
-{
- traverse_visitbp_data_t *tv;
- int error;
-
- tv = kmem_zalloc(sizeof(traverse_visitbp_data_t) *
- TRAVERSE_VISITBP_MAX_DEPTH, KM_SLEEP);
- __traverse_visitbp_init(tv, td, dnp, pbuf, bp, zb, 0);
-
- error = __traverse_visitbp(tv);
-
- kmem_free(tv, sizeof(traverse_visitbp_data_t) *
- TRAVERSE_VISITBP_MAX_DEPTH);
-
- return (error);
+ return (err != 0 ? err : lasterr);
}
static int
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-14 20:22:16 +0000