diff options
Diffstat (limited to 'include/sys/dnode.h')
| -rw-r--r-- | include/sys/dnode.h | 44 |
1 files changed, 30 insertions, 14 deletions
diff --git a/include/sys/dnode.h b/include/sys/dnode.h index c5250d51a..cee4ea783 100644 --- a/include/sys/dnode.h +++ b/include/sys/dnode.h @@ -79,11 +79,18 @@ extern "C" { /* * Derived constants. */ -#define DNODE_SIZE (1 << DNODE_SHIFT) -#define DN_MAX_NBLKPTR ((DNODE_SIZE - DNODE_CORE_SIZE) >> SPA_BLKPTRSHIFT) -#define DN_MAX_BONUSLEN (DNODE_SIZE - DNODE_CORE_SIZE - (1 << SPA_BLKPTRSHIFT)) +#define DNODE_MIN_SIZE (1 << DNODE_SHIFT) +#define DNODE_MAX_SIZE (1 << DNODE_BLOCK_SHIFT) +#define DNODE_BLOCK_SIZE (1 << DNODE_BLOCK_SHIFT) +#define DNODE_MIN_SLOTS (DNODE_MIN_SIZE >> DNODE_SHIFT) +#define DNODE_MAX_SLOTS (DNODE_MAX_SIZE >> DNODE_SHIFT) +#define DN_BONUS_SIZE(dnsize) ((dnsize) - DNODE_CORE_SIZE - \ + (1 << SPA_BLKPTRSHIFT)) +#define DN_SLOTS_TO_BONUSLEN(slots) DN_BONUS_SIZE((slots) << DNODE_SHIFT) +#define DN_OLD_MAX_BONUSLEN (DN_BONUS_SIZE(DNODE_MIN_SIZE)) +#define DN_MAX_NBLKPTR ((DNODE_MIN_SIZE - DNODE_CORE_SIZE) >> SPA_BLKPTRSHIFT) #define DN_MAX_OBJECT (1ULL << DN_MAX_OBJECT_SHIFT) -#define DN_ZERO_BONUSLEN (DN_MAX_BONUSLEN + 1) +#define DN_ZERO_BONUSLEN (DN_BONUS_SIZE(DNODE_MAX_SIZE) + 1) #define DN_KILL_SPILLBLK (1) #define DNODES_PER_BLOCK_SHIFT (DNODE_BLOCK_SHIFT - DNODE_SHIFT) @@ -131,7 +138,8 @@ typedef struct dnode_phys { uint8_t dn_flags; /* DNODE_FLAG_* */ uint16_t dn_datablkszsec; /* data block size in 512b sectors */ uint16_t dn_bonuslen; /* length of dn_bonus */ - uint8_t dn_pad2[4]; + uint8_t dn_extra_slots; /* # of subsequent slots consumed */ + uint8_t dn_pad2[3]; /* accounting is protected by dn_dirty_mtx */ uint64_t dn_maxblkid; /* largest allocated block ID */ @@ -140,8 +148,11 @@ typedef struct dnode_phys { uint64_t dn_pad3[4]; /* - * The tail region is 448 bytes, and there are three ways to - * look at it. + * The tail region is 448 bytes for a 512 byte dnode, and + * correspondingly larger for larger dnode sizes. The spill + * block pointer, when present, is always at the end of the tail + * region. There are three ways this space may be used, using + * a 512 byte dnode for this diagram: * * 0 64 128 192 256 320 384 448 (offset) * +---------------+---------------+---------------+-------+ @@ -149,23 +160,27 @@ typedef struct dnode_phys { * +---------------+---------------+---------------+-------+ * | dn_blkptr[0] | dn_bonus[0..319] | * +---------------+-----------------------+---------------+ - * | dn_blkptr[0] | / | dn_spill | + * | dn_blkptr[0] | dn_bonus[0..191] | dn_spill | * +---------------+-----------------------+---------------+ */ union { - blkptr_t dn_blkptr[1+DN_MAX_BONUSLEN/sizeof (blkptr_t)]; + blkptr_t dn_blkptr[1+DN_OLD_MAX_BONUSLEN/sizeof (blkptr_t)]; struct { blkptr_t __dn_ignore1; - uint8_t dn_bonus[DN_MAX_BONUSLEN]; + uint8_t dn_bonus[DN_OLD_MAX_BONUSLEN]; }; struct { blkptr_t __dn_ignore2; - uint8_t __dn_ignore3[DN_MAX_BONUSLEN-sizeof (blkptr_t)]; + uint8_t __dn_ignore3[DN_OLD_MAX_BONUSLEN - + sizeof (blkptr_t)]; blkptr_t dn_spill; }; }; } dnode_phys_t; +#define DN_SPILL_BLKPTR(dnp) (blkptr_t *)((char *)(dnp) + \ + (((dnp)->dn_extra_slots + 1) << DNODE_SHIFT) - (1 << SPA_BLKPTRSHIFT)) + typedef struct dnode { /* * Protects the structure of the dnode, including the number of levels @@ -202,6 +217,7 @@ typedef struct dnode { uint32_t dn_datablksz; /* in bytes */ uint64_t dn_maxblkid; uint8_t dn_next_type[TXG_SIZE]; + uint8_t dn_num_slots; /* metadnode slots consumed on disk */ uint8_t dn_next_nblkptr[TXG_SIZE]; uint8_t dn_next_nlevels[TXG_SIZE]; uint8_t dn_next_indblkshift[TXG_SIZE]; @@ -299,7 +315,7 @@ void dnode_rm_spill(dnode_t *dn, dmu_tx_t *tx); int dnode_hold(struct objset *dd, uint64_t object, void *ref, dnode_t **dnp); -int dnode_hold_impl(struct objset *dd, uint64_t object, int flag, +int dnode_hold_impl(struct objset *dd, uint64_t object, int flag, int dn_slots, void *ref, dnode_t **dnp); boolean_t dnode_add_ref(dnode_t *dn, void *ref); void dnode_rele(dnode_t *dn, void *ref); @@ -307,9 +323,9 @@ void dnode_rele_and_unlock(dnode_t *dn, void *tag); void dnode_setdirty(dnode_t *dn, dmu_tx_t *tx); void dnode_sync(dnode_t *dn, dmu_tx_t *tx); void dnode_allocate(dnode_t *dn, dmu_object_type_t ot, int blocksize, int ibs, - dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx); + dmu_object_type_t bonustype, int bonuslen, int dn_slots, dmu_tx_t *tx); void dnode_reallocate(dnode_t *dn, dmu_object_type_t ot, int blocksize, - dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx); + dmu_object_type_t bonustype, int bonuslen, int dn_slots, dmu_tx_t *tx); void dnode_free(dnode_t *dn, dmu_tx_t *tx); void dnode_byteswap(dnode_phys_t *dnp); void dnode_buf_byteswap(void *buf, size_t size); |