diff options
Diffstat (limited to 'module/zfs/arc.c')
| -rw-r--r-- | module/zfs/arc.c | 65 |
1 files changed, 55 insertions, 10 deletions
diff --git a/module/zfs/arc.c b/module/zfs/arc.c index a0b74a473..800394c21 100644 --- a/module/zfs/arc.c +++ b/module/zfs/arc.c @@ -304,6 +304,7 @@ typedef struct arc_stats { kstat_named_t arcstat_l2_evict_lock_retry; kstat_named_t arcstat_l2_evict_reading; kstat_named_t arcstat_l2_free_on_write; + kstat_named_t arcstat_l2_cdata_free_on_write; kstat_named_t arcstat_l2_abort_lowmem; kstat_named_t arcstat_l2_cksum_bad; kstat_named_t arcstat_l2_io_error; @@ -392,6 +393,7 @@ static arc_stats_t arc_stats = { { "l2_evict_lock_retry", KSTAT_DATA_UINT64 }, { "l2_evict_reading", KSTAT_DATA_UINT64 }, { "l2_free_on_write", KSTAT_DATA_UINT64 }, + { "l2_cdata_free_on_write", KSTAT_DATA_UINT64 }, { "l2_abort_lowmem", KSTAT_DATA_UINT64 }, { "l2_cksum_bad", KSTAT_DATA_UINT64 }, { "l2_io_error", KSTAT_DATA_UINT64 }, @@ -1466,6 +1468,21 @@ arc_buf_add_ref(arc_buf_t *buf, void* tag) data, metadata, hits); } +static void +arc_buf_free_on_write(void *data, size_t size, + void (*free_func)(void *, size_t)) +{ + l2arc_data_free_t *df; + + df = kmem_alloc(sizeof (l2arc_data_free_t), KM_SLEEP); + df->l2df_data = data; + df->l2df_size = size; + df->l2df_func = free_func; + mutex_enter(&l2arc_free_on_write_mtx); + list_insert_head(l2arc_free_on_write, df); + mutex_exit(&l2arc_free_on_write_mtx); +} + /* * Free the arc data buffer. If it is an l2arc write in progress, * the buffer is placed on l2arc_free_on_write to be freed later. @@ -1476,14 +1493,7 @@ arc_buf_data_free(arc_buf_t *buf, void (*free_func)(void *, size_t)) arc_buf_hdr_t *hdr = buf->b_hdr; if (HDR_L2_WRITING(hdr)) { - l2arc_data_free_t *df; - df = kmem_alloc(sizeof (l2arc_data_free_t), KM_SLEEP); - df->l2df_data = buf->b_data; - df->l2df_size = hdr->b_size; - df->l2df_func = free_func; - mutex_enter(&l2arc_free_on_write_mtx); - list_insert_head(l2arc_free_on_write, df); - mutex_exit(&l2arc_free_on_write_mtx); + arc_buf_free_on_write(buf->b_data, hdr->b_size, free_func); ARCSTAT_BUMP(arcstat_l2_free_on_write); } else { free_func(buf->b_data, hdr->b_size); @@ -1495,6 +1505,23 @@ arc_buf_data_free(arc_buf_t *buf, void (*free_func)(void *, size_t)) * arc_buf_t off of the the arc_buf_hdr_t's list and free it. */ static void +arc_buf_l2_cdata_free(arc_buf_hdr_t *hdr) +{ + l2arc_buf_hdr_t *l2hdr = hdr->b_l2hdr; + + ASSERT(MUTEX_HELD(&l2arc_buflist_mtx)); + + if (l2hdr->b_tmp_cdata == NULL) + return; + + ASSERT(HDR_L2_WRITING(hdr)); + arc_buf_free_on_write(l2hdr->b_tmp_cdata, hdr->b_size, + zio_data_buf_free); + ARCSTAT_BUMP(arcstat_l2_cdata_free_on_write); + l2hdr->b_tmp_cdata = NULL; +} + +static void arc_buf_destroy(arc_buf_t *buf, boolean_t recycle, boolean_t remove) { arc_buf_t **bufp; @@ -1589,6 +1616,7 @@ arc_hdr_destroy(arc_buf_hdr_t *hdr) if (l2hdr != NULL) { list_remove(l2hdr->b_dev->l2ad_buflist, hdr); + arc_buf_l2_cdata_free(hdr); ARCSTAT_INCR(arcstat_l2_size, -hdr->b_size); ARCSTAT_INCR(arcstat_l2_asize, -l2hdr->b_asize); vdev_space_update(l2hdr->b_dev->l2ad_vdev, @@ -3602,6 +3630,7 @@ arc_release(arc_buf_t *buf, void *tag) l2hdr = hdr->b_l2hdr; if (l2hdr) { mutex_enter(&l2arc_buflist_mtx); + arc_buf_l2_cdata_free(hdr); hdr->b_l2hdr = NULL; list_remove(l2hdr->b_dev->l2ad_buflist, hdr); } @@ -4843,6 +4872,11 @@ top: ARCSTAT_INCR(arcstat_l2_asize, -abl2->b_asize); bytes_evicted += abl2->b_asize; ab->b_l2hdr = NULL; + /* + * We are destroying l2hdr, so ensure that + * its compressed buffer, if any, is not leaked. + */ + ASSERT(abl2->b_tmp_cdata == NULL); kmem_cache_free(l2arc_hdr_cache, abl2); arc_space_return(L2HDR_SIZE, ARC_SPACE_L2HDRS); ARCSTAT_INCR(arcstat_l2_size, -ab->b_size); @@ -5077,6 +5111,14 @@ l2arc_write_buffers(spa_t *spa, l2arc_dev_t *dev, uint64_t target_sz, buf_data = l2hdr->b_tmp_cdata; buf_sz = l2hdr->b_asize; + /* + * If the data has not been compressed, then clear b_tmp_cdata + * to make sure that it points only to a temporary compression + * buffer. + */ + if (!L2ARC_IS_VALID_COMPRESS(l2hdr->b_compress)) + l2hdr->b_tmp_cdata = NULL; + /* Compression may have squashed the buffer to zero length. */ if (buf_sz != 0) { uint64_t buf_p_sz; @@ -5267,15 +5309,18 @@ l2arc_release_cdata_buf(arc_buf_hdr_t *ab) { l2arc_buf_hdr_t *l2hdr = ab->b_l2hdr; - if (l2hdr->b_compress == ZIO_COMPRESS_LZ4) { + ASSERT(L2ARC_IS_VALID_COMPRESS(l2hdr->b_compress)); + if (l2hdr->b_compress != ZIO_COMPRESS_EMPTY) { /* * If the data was compressed, then we've allocated a * temporary buffer for it, so now we need to release it. */ ASSERT(l2hdr->b_tmp_cdata != NULL); zio_data_buf_free(l2hdr->b_tmp_cdata, ab->b_size); + l2hdr->b_tmp_cdata = NULL; + } else { + ASSERT(l2hdr->b_tmp_cdata == NULL); } - l2hdr->b_tmp_cdata = NULL; } /* |