diff options
Diffstat (limited to 'src/H5Fsplit.c')
| -rw-r--r-- | src/H5Fsplit.c | 90 |
1 files changed, 81 insertions, 9 deletions
diff --git a/src/H5Fsplit.c b/src/H5Fsplit.c index bc57db3..b875023 100644 --- a/src/H5Fsplit.c +++ b/src/H5Fsplit.c @@ -43,15 +43,19 @@ static herr_t H5F_split_write(H5F_low_t *lf, const H5F_access_t *access_parms, static herr_t H5F_split_flush(H5F_low_t *lf, const H5F_access_t *access_parms); static herr_t H5F_split_extend(H5F_low_t *lf, const H5F_access_t *access_parms, intn op, hsize_t size, haddr_t *addr/*out*/); - -const H5F_low_class_t H5F_LOW_SPLIT_g[1] = {{ - H5F_split_access, /* access method */ - H5F_split_open, /* open method */ - H5F_split_close, /* close method */ - H5F_split_read, /* read method */ - H5F_split_write, /* write method */ - H5F_split_flush, /* flush method */ - H5F_split_extend, /* extend method */ +static intn H5F_split_alloc (H5F_low_t *lf, intn op, hsize_t alignment, + hsize_t threshold, size_t size, H5MF_free_t *blk, + haddr_t *addr/*out*/); + +const H5F_low_class_t H5F_LOW_SPLIT_g[1] = {{ + H5F_split_access, /*access method */ + H5F_split_open, /*open method */ + H5F_split_close, /*close method */ + H5F_split_read, /*read method */ + H5F_split_write, /*write method */ + H5F_split_flush, /*flush method */ + H5F_split_extend, /*extend method */ + H5F_split_alloc, /*alloc method */ }}; /* @@ -451,3 +455,71 @@ H5F_split_extend(H5F_low_t *lf, const H5F_access_t *access_parms, intn op, FUNC_LEAVE(SUCCEED); } + + +/*------------------------------------------------------------------------- + * Function: H5F_split_alloc + * + * Purpose: Determines if free block BLK in file LF can be used to + * satisfy the request for SIZE bytes. This function is + * actually the same as H5F_low_alloc() except it returns + * failure if the OP is not compatible with the block address, + * insuring that meta data is allocated from one half of the + * address space and raw data from the other half. + * + * Return: Success: Positive if the free block satisfies the + * request exactly, zero if the free block + * over-satisfies the request. The ADDR will + * contain the address within the free block + * where the request starts. + * + * Failure: FAIL + * + * Programmer: Robb Matzke + * Tuesday, June 9, 1998 + * + * Modifications: + * + *------------------------------------------------------------------------- + */ +static intn +H5F_split_alloc (H5F_low_t *lf, intn op, hsize_t alignment, hsize_t threshold, + size_t size, H5MF_free_t *blk, haddr_t *addr/*out*/) +{ + intn ret_value = FAIL; + hsize_t wasted; + + FUNC_ENTER (H5F_split_alloc, FAIL); + assert (lf); + assert (alignment>0); + assert (size>0); + assert (blk); + assert (addr); + + switch (op) { + case H5MF_META: + if (blk->addr.offset & lf->u.split.mask) return FAIL; + break; + case H5MF_RAW: + if (0==(blk->addr.offset & lf->u.split.mask)) return FAIL; + break; + } + + if (size>=threshold) { + wasted = blk->addr.offset % alignment; + } else { + wasted = 0; + } + if (0==wasted && size==blk->size) { + /* exact match */ + *addr = blk->addr; + ret_value = 1; + } else if (blk->size>wasted && blk->size-wasted>=size) { + /* over-satisfied */ + *addr = blk->addr; + H5F_addr_inc (addr, wasted); + ret_value = 0; + } + + FUNC_LEAVE (ret_value); +} |