Re: [PATCH 4/5] zfs com.delphix:embedded_data feature support

[Andrei Borzenkov <arvidjaar@gmail.com>]

В Thu, 16 Apr 2015 08:23:22 +0300
Toomas Soome <tsoome@me.com> пишет:

Committed with trivial formatting fix.

> 
> ---
>  grub-core/fs/zfs/zfs.c |   84 ++++++++++++++++++++++++++++++++++++++++--------
>  include/grub/zfs/spa.h |   27 +++++++++++++---
>  2 files changed, 93 insertions(+), 18 deletions(-)
> 
> diff --git a/grub-core/fs/zfs/zfs.c b/grub-core/fs/zfs/zfs.c
> index a731c3d..da44131 100644
> --- a/grub-core/fs/zfs/zfs.c
> +++ b/grub-core/fs/zfs/zfs.c
> @@ -282,6 +282,7 @@ grub_crypto_cipher_handle_t (*grub_zfs_load_key) (const struct grub_zfs_key *key
>  static const char *spa_feature_names[] = {
>    "org.illumos:lz4_compress",
>    "com.delphix:hole_birth",
> +  "com.delphix:embedded_data",
>    NULL
>  };
>  
> @@ -1803,6 +1804,39 @@ zio_read_data (blkptr_t * bp, grub_zfs_endian_t endian, void *buf,
>  }
>  
>  /*
> + * buf must be at least BPE_GET_PSIZE(bp) bytes long (which will never be
> + * more than BPE_PAYLOAD_SIZE bytes).
> + */
> +static grub_err_t
> +decode_embedded_bp_compressed(const blkptr_t *bp, void *buf)
> +{
> +  grub_size_t psize, i;
> +  grub_uint8_t *buf8 = buf;
> +  grub_uint64_t w = 0;
> +  const grub_uint64_t *bp64 = (const grub_uint64_t *)bp;
> +
> +  psize = BPE_GET_PSIZE(bp);
> +
> +  /*
> +   * Decode the words of the block pointer into the byte array.
> +   * Low bits of first word are the first byte (little endian).
> +   */
> +  for (i = 0; i < psize; i++)
> +    {
> +      if (i % sizeof (w) == 0)
> +       {
> +         /* beginning of a word */
> +         w = *bp64;
> +         bp64++;
> +         if (!BPE_IS_PAYLOADWORD(bp, bp64))
> +         bp64++;
> +       }
> +      buf8[i] = BF64_GET(w, (i % sizeof (w)) * 8, 8);
> +    }
> +  return GRUB_ERR_NONE;
> +}
> +
> +/*
>   * Read in a block of data, verify its checksum, decompress if needed,
>   * and put the uncompressed data in buf.
>   */
> @@ -1820,12 +1854,26 @@ zio_read (blkptr_t *bp, grub_zfs_endian_t endian, void **buf,
>    *buf = NULL;
>  
>    checksum = (grub_zfs_to_cpu64((bp)->blk_prop, endian) >> 40) & 0xff;
> -  comp = (grub_zfs_to_cpu64((bp)->blk_prop, endian)>>32) & 0xff;
> +  comp = (grub_zfs_to_cpu64((bp)->blk_prop, endian)>>32) & 0x7f;
>    encrypted = ((grub_zfs_to_cpu64((bp)->blk_prop, endian) >> 60) & 3);
> -  lsize = (BP_IS_HOLE(bp) ? 0 :
> -	   (((grub_zfs_to_cpu64 ((bp)->blk_prop, endian) & 0xffff) + 1)
> -	    << SPA_MINBLOCKSHIFT));
> -  psize = get_psize (bp, endian);
> +  if (BP_IS_EMBEDDED(bp))
> +    {
> +      if (BPE_GET_ETYPE(bp) != BP_EMBEDDED_TYPE_DATA)
> +	return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
> +			   "unsupported embedded BP (type=%u)\n",
> +			   BPE_GET_ETYPE(bp));
> +      lsize = BPE_GET_LSIZE(bp);
> +      psize = BF64_GET_SB(grub_zfs_to_cpu64 ((bp)->blk_prop, endian), 25, 7, 0, 1);
> +    }
> +  else
> +    {
> +      lsize = (BP_IS_HOLE(bp) ? 0 :
> +	       (((grub_zfs_to_cpu64 ((bp)->blk_prop, endian) & 0xffff) + 1)
> +	        << SPA_MINBLOCKSHIFT));
> +      psize = get_psize (bp, endian);
> +    }
> +  grub_dprintf("zfs", "zio_read: E %d: size %" PRIdGRUB_SSIZE "/%"
> +	       PRIdGRUB_SSIZE "\n", (int)BP_IS_EMBEDDED(bp), lsize, psize);
>  
>    if (size)
>      *size = lsize;
> @@ -1849,23 +1897,31 @@ zio_read (blkptr_t *bp, grub_zfs_endian_t endian, void **buf,
>      compbuf = *buf = grub_malloc (lsize);
>  
>    grub_dprintf ("zfs", "endian = %d\n", endian);
> -  err = zio_read_data (bp, endian, compbuf, data);
> +  if (BP_IS_EMBEDDED(bp))
> +    err = decode_embedded_bp_compressed(bp, compbuf);
> +  else
> +    {
> +      err = zio_read_data (bp, endian, compbuf, data);
> +      grub_memset (compbuf, 0, ALIGN_UP (psize, 16) - psize);
> +    }
>    if (err)
>      {
>        grub_free (compbuf);
>        *buf = NULL;
>        return err;
>      }
> -  grub_memset (compbuf, 0, ALIGN_UP (psize, 16) - psize);
>  
> -  err = zio_checksum_verify (zc, checksum, endian,
> -			     compbuf, psize);
> -  if (err)
> +  if (!BP_IS_EMBEDDED(bp))
>      {
> -      grub_dprintf ("zfs", "incorrect checksum\n");
> -      grub_free (compbuf);
> -      *buf = NULL;
> -      return err;
> +      err = zio_checksum_verify (zc, checksum, endian,
> +			         compbuf, psize);
> +      if (err)
> +        {
> +          grub_dprintf ("zfs", "incorrect checksum\n");
> +          grub_free (compbuf);
> +          *buf = NULL;
> +          return err;
> +        }
>      }
>  
>    if (encrypted)
> diff --git a/include/grub/zfs/spa.h b/include/grub/zfs/spa.h
> index df43b6b..5d89250 100644
> --- a/include/grub/zfs/spa.h
> +++ b/include/grub/zfs/spa.h
> @@ -126,7 +126,7 @@ typedef struct zio_cksum {
>   *	+-------+-------+-------+-------+-------+-------+-------+-------+
>   * 5	|G|			 offset3				|
>   *	+-------+-------+-------+-------+-------+-------+-------+-------+
> - * 6	|BDX|lvl| type	| cksum | comp	|     PSIZE	|     LSIZE	|
> + * 6	|BDX|lvl| type	| cksum |E| comp|    PSIZE	|     LSIZE	|
>   *	+-------+-------+-------+-------+-------+-------+-------+-------+
>   * 7	|			padding					|
>   *	+-------+-------+-------+-------+-------+-------+-------+-------+
> @@ -160,7 +160,8 @@ typedef struct zio_cksum {
>   * G		gang block indicator
>   * B		byteorder (endianness)
>   * D		dedup
> - * X		unused
> + * X		encryption
> + * E		blkptr_t contains embedded data
>   * lvl		level of indirection
>   * type		DMU object type
>   * phys birth	txg of block allocation; zero if same as logical birth txg
> @@ -203,8 +204,8 @@ typedef struct blkptr {
>  #define	BP_SET_LSIZE(bp, x)	\
>  	BF64_SET_SB((bp)->blk_prop, 0, 16, SPA_MINBLOCKSHIFT, 1, x)
>  
> -#define	BP_GET_COMPRESS(bp)		BF64_GET((bp)->blk_prop, 32, 8)
> -#define	BP_SET_COMPRESS(bp, x)		BF64_SET((bp)->blk_prop, 32, 8, x)
> +#define	BP_GET_COMPRESS(bp)		BF64_GET((bp)->blk_prop, 32, 7)
> +#define	BP_SET_COMPRESS(bp, x)		BF64_SET((bp)->blk_prop, 32, 7, x)
>  
>  #define	BP_GET_CHECKSUM(bp)		BF64_GET((bp)->blk_prop, 40, 8)
>  #define	BP_SET_CHECKSUM(bp, x)		BF64_SET((bp)->blk_prop, 40, 8, x)
> @@ -215,6 +216,8 @@ typedef struct blkptr {
>  #define	BP_GET_LEVEL(bp)		BF64_GET((bp)->blk_prop, 56, 5)
>  #define	BP_SET_LEVEL(bp, x)		BF64_SET((bp)->blk_prop, 56, 5, x)
>  
> +#define	BP_IS_EMBEDDED(bp)		BF64_GET((bp)->blk_prop, 39, 1)
> +
>  #define	BP_GET_PROP_BIT_61(bp)		BF64_GET((bp)->blk_prop, 61, 1)
>  #define	BP_SET_PROP_BIT_61(bp, x)	BF64_SET((bp)->blk_prop, 61, 1, x)
>  
> @@ -277,6 +280,22 @@ typedef struct blkptr {
>  	(zcp)->zc_word[3] = w3;			\
>  }
>  
> +#define	BPE_GET_ETYPE(bp)	BP_GET_CHECKSUM(bp)
> +#define	BPE_GET_LSIZE(bp)	\
> +	BF64_GET_SB((bp)->blk_prop, 0, 25, 0, 1)
> +#define	BPE_GET_PSIZE(bp)	\
> +	BF64_GET_SB((bp)->blk_prop, 25, 7, 0, 1)
> +
> +typedef enum bp_embedded_type {
> +  BP_EMBEDDED_TYPE_DATA,
> +  NUM_BP_EMBEDDED_TYPES
> +} bp_embedded_type_t;
> +
> +#define	BPE_NUM_WORDS	14
> +#define	BPE_PAYLOAD_SIZE	(BPE_NUM_WORDS * sizeof(grub_uint64_t))
> +#define	BPE_IS_PAYLOADWORD(bp, wp)	\
> +	((wp) != &(bp)->blk_prop && (wp) != &(bp)->blk_birth)
> +
>  #define	BP_IDENTITY(bp)		(&(bp)->blk_dva[0])
>  #define	BP_IS_GANG(bp)		DVA_GET_GANG(BP_IDENTITY(bp))
>  #define	DVA_IS_EMPTY(dva)	((dva)->dva_word[0] == 0ULL && \