/* * Allocate a new buf log item to go with the given buffer. * Set the buffer's b_fsprivate field to point to the new * buf log item. If there are other item's attached to the * buffer (see xfs_buf_attach_iodone() below), then put the * buf log item at the front. */ void xfs_buf_item_init( xfs_buf_t *bp, xfs_mount_t *mp) { xfs_log_item_t *lip = bp->b_fspriv; xfs_buf_log_item_t *bip; int chunks; int map_size; int error; int i; /* * Check to see if there is already a buf log item for * this buffer. If there is, it is guaranteed to be * the first. If we do already have one, there is * nothing to do here so return. */ ASSERT(bp->b_target->bt_mount == mp); if (lip != NULL && lip->li_type == XFS_LI_BUF) return; bip = kmem_zone_zalloc(xfs_buf_item_zone, KM_SLEEP); xfs_log_item_init(mp, &bip->bli_item, XFS_LI_BUF, &xfs_buf_item_ops); bip->bli_buf = bp; xfs_buf_hold(bp); /* * chunks is the number of XFS_BLF_CHUNK size pieces the buffer * can be divided into. Make sure not to truncate any pieces. * map_size is the size of the bitmap needed to describe the * chunks of the buffer. * * Discontiguous buffer support follows the layout of the underlying * buffer. This makes the implementation as simple as possible. */ error = xfs_buf_item_get_format(bip, bp->b_map_count); ASSERT(error == 0); for (i = 0; i < bip->bli_format_count; i++) { chunks = DIV_ROUND_UP(BBTOB(bp->b_maps[i].bm_len), XFS_BLF_CHUNK); map_size = DIV_ROUND_UP(chunks, NBWORD); bip->bli_formats[i].blf_type = XFS_LI_BUF; bip->bli_formats[i].blf_blkno = bp->b_maps[i].bm_bn; bip->bli_formats[i].blf_len = bp->b_maps[i].bm_len; bip->bli_formats[i].blf_map_size = map_size; } /* * Put the buf item into the list of items attached to the * buffer at the front. */ if (bp->b_fspriv) bip->bli_item.li_bio_list = bp->b_fspriv; bp->b_fspriv = bip; }
/* * Allocate a new buf log item to go with the given buffer. * Set the buffer's b_fsprivate field to point to the new * buf log item. If there are other item's attached to the * buffer (see xfs_buf_attach_iodone() below), then put the * buf log item at the front. */ void xfs_buf_item_init( xfs_buf_t *bp, xfs_mount_t *mp) { xfs_log_item_t *lip = bp->b_fspriv; xfs_buf_log_item_t *bip; int chunks; int map_size; int error; int i; /* * Check to see if there is already a buf log item for * this buffer. If there is, it is guaranteed to be * the first. If we do already have one, there is * nothing to do here so return. */ ASSERT(bp->b_target->bt_mount == mp); if (lip != NULL && lip->li_type == XFS_LI_BUF) return; bip = kmem_zone_zalloc(xfs_buf_item_zone, KM_SLEEP); xfs_log_item_init(mp, &bip->bli_item, XFS_LI_BUF, &xfs_buf_item_ops); bip->bli_buf = bp; xfs_buf_hold(bp); /* * chunks is the number of XFS_BLF_CHUNK size pieces the buffer * can be divided into. Make sure not to truncate any pieces. * map_size is the size of the bitmap needed to describe the * chunks of the buffer. * * Discontiguous buffer support follows the layout of the underlying * buffer. This makes the implementation as simple as possible. */ error = xfs_buf_item_get_format(bip, bp->b_map_count); ASSERT(error == 0); for (i = 0; i < bip->bli_format_count; i++) { chunks = DIV_ROUND_UP(BBTOB(bp->b_maps[i].bm_len), XFS_BLF_CHUNK); map_size = DIV_ROUND_UP(chunks, NBWORD); bip->bli_formats[i].blf_type = XFS_LI_BUF; bip->bli_formats[i].blf_blkno = bp->b_maps[i].bm_bn; bip->bli_formats[i].blf_len = bp->b_maps[i].bm_len; bip->bli_formats[i].blf_map_size = map_size; } #ifdef XFS_TRANS_DEBUG /* * Allocate the arrays for tracking what needs to be logged * and what our callers request to be logged. bli_orig * holds a copy of the original, clean buffer for comparison * against, and bli_logged keeps a 1 bit flag per byte in * the buffer to indicate which bytes the callers have asked * to have logged. */ bip->bli_orig = kmem_alloc(BBTOB(bp->b_length), KM_SLEEP); memcpy(bip->bli_orig, bp->b_addr, BBTOB(bp->b_length)); bip->bli_logged = kmem_zalloc(BBTOB(bp->b_length) / NBBY, KM_SLEEP); #endif /* * Put the buf item into the list of items attached to the * buffer at the front. */ if (bp->b_fspriv) bip->bli_item.li_bio_list = bp->b_fspriv; bp->b_fspriv = bip; }