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-rw-r--r--include/linux/bio.h108
1 files changed, 55 insertions, 53 deletions
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 0933a14e641..ff5b4cf9e2d 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -26,21 +26,8 @@
#ifdef CONFIG_BLOCK
-/* Platforms may set this to teach the BIO layer about IOMMU hardware. */
#include <asm/io.h>
-#if defined(BIO_VMERGE_MAX_SIZE) && defined(BIO_VMERGE_BOUNDARY)
-#define BIOVEC_VIRT_START_SIZE(x) (bvec_to_phys(x) & (BIO_VMERGE_BOUNDARY - 1))
-#define BIOVEC_VIRT_OVERSIZE(x) ((x) > BIO_VMERGE_MAX_SIZE)
-#else
-#define BIOVEC_VIRT_START_SIZE(x) 0
-#define BIOVEC_VIRT_OVERSIZE(x) 0
-#endif
-
-#ifndef BIO_VMERGE_BOUNDARY
-#define BIO_VMERGE_BOUNDARY 0
-#endif
-
#define BIO_DEBUG
#ifdef BIO_DEBUG
@@ -88,25 +75,14 @@ struct bio {
/* Number of segments in this BIO after
* physical address coalescing is performed.
*/
- unsigned short bi_phys_segments;
-
- /* Number of segments after physical and DMA remapping
- * hardware coalescing is performed.
- */
- unsigned short bi_hw_segments;
+ unsigned int bi_phys_segments;
unsigned int bi_size; /* residual I/O count */
- /*
- * To keep track of the max hw size, we account for the
- * sizes of the first and last virtually mergeable segments
- * in this bio
- */
- unsigned int bi_hw_front_size;
- unsigned int bi_hw_back_size;
-
unsigned int bi_max_vecs; /* max bvl_vecs we can hold */
+ unsigned int bi_comp_cpu; /* completion CPU */
+
struct bio_vec *bi_io_vec; /* the actual vec list */
bio_end_io_t *bi_end_io;
@@ -126,11 +102,14 @@ struct bio {
#define BIO_UPTODATE 0 /* ok after I/O completion */
#define BIO_RW_BLOCK 1 /* RW_AHEAD set, and read/write would block */
#define BIO_EOF 2 /* out-out-bounds error */
-#define BIO_SEG_VALID 3 /* nr_hw_seg valid */
+#define BIO_SEG_VALID 3 /* bi_phys_segments valid */
#define BIO_CLONED 4 /* doesn't own data */
#define BIO_BOUNCED 5 /* bio is a bounce bio */
#define BIO_USER_MAPPED 6 /* contains user pages */
#define BIO_EOPNOTSUPP 7 /* not supported */
+#define BIO_CPU_AFFINE 8 /* complete bio on same CPU as submitted */
+#define BIO_NULL_MAPPED 9 /* contains invalid user pages */
+#define BIO_FS_INTEGRITY 10 /* fs owns integrity data, not block layer */
#define bio_flagged(bio, flag) ((bio)->bi_flags & (1 << (flag)))
/*
@@ -144,18 +123,31 @@ struct bio {
/*
* bio bi_rw flags
*
- * bit 0 -- read (not set) or write (set)
+ * bit 0 -- data direction
+ * If not set, bio is a read from device. If set, it's a write to device.
* bit 1 -- rw-ahead when set
* bit 2 -- barrier
+ * Insert a serialization point in the IO queue, forcing previously
+ * submitted IO to be completed before this oen is issued.
* bit 3 -- fail fast, don't want low level driver retries
* bit 4 -- synchronous I/O hint: the block layer will unplug immediately
+ * Note that this does NOT indicate that the IO itself is sync, just
+ * that the block layer will not postpone issue of this IO by plugging.
+ * bit 5 -- metadata request
+ * Used for tracing to differentiate metadata and data IO. May also
+ * get some preferential treatment in the IO scheduler
+ * bit 6 -- discard sectors
+ * Informs the lower level device that this range of sectors is no longer
+ * used by the file system and may thus be freed by the device. Used
+ * for flash based storage.
*/
-#define BIO_RW 0
-#define BIO_RW_AHEAD 1
+#define BIO_RW 0 /* Must match RW in req flags (blkdev.h) */
+#define BIO_RW_AHEAD 1 /* Must match FAILFAST in req flags */
#define BIO_RW_BARRIER 2
#define BIO_RW_FAILFAST 3
#define BIO_RW_SYNC 4
#define BIO_RW_META 5
+#define BIO_RW_DISCARD 6
/*
* upper 16 bits of bi_rw define the io priority of this bio
@@ -185,14 +177,15 @@ struct bio {
#define bio_failfast(bio) ((bio)->bi_rw & (1 << BIO_RW_FAILFAST))
#define bio_rw_ahead(bio) ((bio)->bi_rw & (1 << BIO_RW_AHEAD))
#define bio_rw_meta(bio) ((bio)->bi_rw & (1 << BIO_RW_META))
-#define bio_empty_barrier(bio) (bio_barrier(bio) && !(bio)->bi_size)
+#define bio_discard(bio) ((bio)->bi_rw & (1 << BIO_RW_DISCARD))
+#define bio_empty_barrier(bio) (bio_barrier(bio) && !bio_has_data(bio) && !bio_discard(bio))
static inline unsigned int bio_cur_sectors(struct bio *bio)
{
if (bio->bi_vcnt)
return bio_iovec(bio)->bv_len >> 9;
-
- return 0;
+ else /* dataless requests such as discard */
+ return bio->bi_size >> 9;
}
static inline void *bio_data(struct bio *bio)
@@ -236,8 +229,6 @@ static inline void *bio_data(struct bio *bio)
((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2)))
#endif
-#define BIOVEC_VIRT_MERGEABLE(vec1, vec2) \
- ((((bvec_to_phys((vec1)) + (vec1)->bv_len) | bvec_to_phys((vec2))) & (BIO_VMERGE_BOUNDARY - 1)) == 0)
#define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \
(((addr1) | (mask)) == (((addr2) - 1) | (mask)))
#define BIOVEC_SEG_BOUNDARY(q, b1, b2) \
@@ -319,15 +310,14 @@ struct bio_pair {
atomic_t cnt;
int error;
};
-extern struct bio_pair *bio_split(struct bio *bi, mempool_t *pool,
- int first_sectors);
-extern mempool_t *bio_split_pool;
+extern struct bio_pair *bio_split(struct bio *bi, int first_sectors);
extern void bio_pair_release(struct bio_pair *dbio);
extern struct bio_set *bioset_create(int, int);
extern void bioset_free(struct bio_set *);
extern struct bio *bio_alloc(gfp_t, int);
+extern struct bio *bio_kmalloc(gfp_t, int);
extern struct bio *bio_alloc_bioset(gfp_t, int, struct bio_set *);
extern void bio_put(struct bio *);
extern void bio_free(struct bio *, struct bio_set *);
@@ -335,7 +325,6 @@ extern void bio_free(struct bio *, struct bio_set *);
extern void bio_endio(struct bio *, int);
struct request_queue;
extern int bio_phys_segments(struct request_queue *, struct bio *);
-extern int bio_hw_segments(struct request_queue *, struct bio *);
extern void __bio_clone(struct bio *, struct bio *);
extern struct bio *bio_clone(struct bio *, gfp_t);
@@ -346,12 +335,14 @@ extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int);
extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *,
unsigned int, unsigned int);
extern int bio_get_nr_vecs(struct block_device *);
+extern sector_t bio_sector_offset(struct bio *, unsigned short, unsigned int);
extern struct bio *bio_map_user(struct request_queue *, struct block_device *,
- unsigned long, unsigned int, int);
+ unsigned long, unsigned int, int, gfp_t);
struct sg_iovec;
+struct rq_map_data;
extern struct bio *bio_map_user_iov(struct request_queue *,
struct block_device *,
- struct sg_iovec *, int, int);
+ struct sg_iovec *, int, int, gfp_t);
extern void bio_unmap_user(struct bio *);
extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int,
gfp_t);
@@ -359,15 +350,25 @@ extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int,
gfp_t, int);
extern void bio_set_pages_dirty(struct bio *bio);
extern void bio_check_pages_dirty(struct bio *bio);
-extern struct bio *bio_copy_user(struct request_queue *, unsigned long, unsigned int, int);
-extern struct bio *bio_copy_user_iov(struct request_queue *, struct sg_iovec *,
- int, int);
+extern struct bio *bio_copy_user(struct request_queue *, struct rq_map_data *,
+ unsigned long, unsigned int, int, gfp_t);
+extern struct bio *bio_copy_user_iov(struct request_queue *,
+ struct rq_map_data *, struct sg_iovec *,
+ int, int, gfp_t);
extern int bio_uncopy_user(struct bio *);
void zero_fill_bio(struct bio *bio);
extern struct bio_vec *bvec_alloc_bs(gfp_t, int, unsigned long *, struct bio_set *);
extern unsigned int bvec_nr_vecs(unsigned short idx);
/*
+ * Allow queuer to specify a completion CPU for this bio
+ */
+static inline void bio_set_completion_cpu(struct bio *bio, unsigned int cpu)
+{
+ bio->bi_comp_cpu = cpu;
+}
+
+/*
* bio_set is used to allow other portions of the IO system to
* allocate their own private memory pools for bio and iovec structures.
* These memory pools in turn all allocate from the bio_slab
@@ -445,6 +446,14 @@ static inline char *__bio_kmap_irq(struct bio *bio, unsigned short idx,
__bio_kmap_irq((bio), (bio)->bi_idx, (flags))
#define bio_kunmap_irq(buf,flags) __bio_kunmap_irq(buf, flags)
+/*
+ * Check whether this bio carries any data or not. A NULL bio is allowed.
+ */
+static inline int bio_has_data(struct bio *bio)
+{
+ return bio && bio->bi_io_vec != NULL;
+}
+
#if defined(CONFIG_BLK_DEV_INTEGRITY)
#define bip_vec_idx(bip, idx) (&(bip->bip_vec[(idx)]))
@@ -458,14 +467,7 @@ static inline char *__bio_kmap_irq(struct bio *bio, unsigned short idx,
#define bip_for_each_vec(bvl, bip, i) \
__bip_for_each_vec(bvl, bip, i, (bip)->bip_idx)
-static inline int bio_integrity(struct bio *bio)
-{
-#if defined(CONFIG_BLK_DEV_INTEGRITY)
- return bio->bi_integrity != NULL;
-#else
- return 0;
-#endif
-}
+#define bio_integrity(bio) (bio->bi_integrity != NULL)
extern struct bio_integrity_payload *bio_integrity_alloc_bioset(struct bio *, gfp_t, unsigned int, struct bio_set *);
extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int);
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-27 22:37:47 +0000