blk_add_trace_bio_remap – Add a trace for a bio-remap operation Synopsis void blk_add_trace_bio_remap(void *ignore, struct request_queue *q, struct bio *bio, dev_t dev, sector_t from); Arguments ignore trace callback data parameter (not used) q queue the io is for bio the source bio dev target device from source sector Description Device mapper or raid target sometimes need…
blk_add_trace_bio – Add a trace for a bio oriented action Synopsis void blk_add_trace_bio(struct request_queue *q, struct bio *bio, u32 what, int error); Arguments q queue the io is for bio the source bio what the action error error, if any Description Records an action against a bio. Will log the bio offset + size. Copyright
blk_add_request_payload – add a payload to a request Synopsis void blk_add_request_payload(struct request *rq, struct page *page, int offset, unsigned int len); Arguments rq request to update page page backing the payload offset offset in page len length of the payload. Description This allows to later add a payload to an already submitted request by a…
bitmap_to_u32array – copy the contents of bitmap to a u32 array of bits Synopsis unsigned int bitmap_to_u32array(u32 *buf, unsigned int nwords, const unsigned long *bitmap, unsigned int nbits); Arguments buf array of u32 (in host byte order), the dest bitmap, non NULL nwords number of u32 words in buf bitmap array of unsigned longs, the…
bitmap_remap – Apply map defined by a pair of bitmaps to another bitmap Synopsis void bitmap_remap(unsigned long *dst, const unsigned long *src, const unsigned long *old, const unsigned long *new, unsigned int nbits); Arguments dst remapped result src subset to be remapped old defines domain of map new defines range of map nbits number of…
bitmap_release_region – release allocated bitmap region Synopsis void bitmap_release_region(unsigned long *bitmap, unsigned int pos, int order); Arguments bitmap array of unsigned longs corresponding to the bitmap pos beginning of bit region to release order region size (log base 2 of number of bits) to release Description This is the complement to __bitmap_find_free_region and releases the…
bitmap_print_to_pagebuf – convert bitmap to list or hex format ASCII string Synopsis int bitmap_print_to_pagebuf(bool list, char *buf, const unsigned long *maskp, int nmaskbits); Arguments list indicates whether the bitmap must be list buf page aligned buffer into which string is placed maskp pointer to bitmap to convert nmaskbits size of bitmap, in bits Description Output…
bitmap_pos_to_ord – find ordinal of set bit at given position in bitmap Synopsis int bitmap_pos_to_ord(const unsigned long *buf, unsigned int pos, unsigned int nbits); Arguments buf pointer to a bitmap pos a bit position in buf (0 <= pos < nbits) nbits number of valid bit positions in buf Description Map the bit at position…
bitmap_parselist_user – Synopsis int bitmap_parselist_user(const char __user *ubuf, unsigned int ulen, unsigned long *maskp, int nmaskbits); Arguments ubuf pointer to user buffer containing string. ulen buffer size in bytes. If string is smaller than this then it must be terminated with a
bitmap_parse_user – convert an ASCII hex string in a user buffer into a bitmap Synopsis int bitmap_parse_user(const char __user *ubuf, unsigned int ulen, unsigned long *maskp, int nmaskbits); Arguments ubuf pointer to user buffer containing string. ulen buffer size in bytes. If string is smaller than this then it must be terminated with a
bitmap_ord_to_pos – find position of n-th set bit in bitmap Synopsis unsigned int bitmap_ord_to_pos(const unsigned long *buf, unsigned int ord, unsigned int nbits); Arguments buf pointer to bitmap ord ordinal bit position (n-th set bit, n >= 0) nbits number of valid bit positions in buf Description Map the ordinal offset of bit ord in…
bitmap_onto – translate one bitmap relative to another Synopsis void bitmap_onto(unsigned long *dst, const unsigned long *orig, const unsigned long *relmap, unsigned int bits); Arguments dst resulting translated bitmap orig original untranslated bitmap relmap bitmap relative to which translated bits number of bits in each of these bitmaps Description Set the n-th bit of dst…
bitmap_from_u32array – copy the contents of a u32 array of bits to bitmap Synopsis unsigned int bitmap_from_u32array(unsigned long *bitmap, unsigned int nbits, const u32 *buf, unsigned int nwords); Arguments bitmap array of unsigned longs, the destination bitmap, non NULL nbits number of bits in bitmap buf array of u32 (in host byte order), the source…
bitmap_fold – fold larger bitmap into smaller, modulo specified size Synopsis void bitmap_fold(unsigned long *dst, const unsigned long *orig, unsigned int sz, unsigned int nbits); Arguments dst resulting smaller bitmap orig original larger bitmap sz specified size nbits number of bits in each of these bitmaps Description For each bit oldbit in orig, set bit…
bitmap_find_next_zero_area_off – find a contiguous aligned zero area Synopsis unsigned long bitmap_find_next_zero_area_off(unsigned long *map, unsigned long size, unsigned long start, unsigned int nr, unsigned long align_mask, unsigned long align_offset); Arguments map The address to base the search on size The bitmap size in bits start The bitnumber to start searching at nr The number of…
bitmap_find_free_region – find a contiguous aligned mem region Synopsis int bitmap_find_free_region(unsigned long *bitmap, unsigned int bits, int order); Arguments bitmap array of unsigned longs corresponding to the bitmap bits number of bits in the bitmap order region size (log base 2 of number of bits) to find Description Find a region of free (zero) bits…
bitmap_copy_le – copy a bitmap, putting the bits into little-endian order. Synopsis void bitmap_copy_le(unsigned long *dst, const unsigned long *src, unsigned int nbits); Arguments dst destination buffer src bitmap to copy nbits number of bits in the bitmap Description Require nbits % BITS_PER_LONG == 0. Copyright
bitmap_bitremap – Apply map defined by a pair of bitmaps to a single bit Synopsis int bitmap_bitremap(int oldbit, const unsigned long *old, const unsigned long *new, int bits); Arguments oldbit bit position to be mapped old defines domain of map new defines range of map bits number of bits in each of these bitmaps Description…
bitmap_allocate_region – allocate bitmap region Synopsis int bitmap_allocate_region(unsigned long *bitmap, unsigned int pos, int order); Arguments bitmap array of unsigned longs corresponding to the bitmap pos beginning of bit region to allocate order region size (log base 2 of number of bits) to allocate Description Allocate (set bits in) a specified region of a bitmap….
bioset_create_nobvec – Create a bio_set without bio_vec mempool Synopsis struct bio_set *bioset_create_nobvec(unsigned int pool_size, unsigned int front_pad); Arguments pool_size Number of bio to cache in the mempool front_pad Number of bytes to allocate in front of the returned bio Description Same functionality as bioset_create except that mempool is not created for bio_vecs. Saving some memory…