* top 4 bits of bio flags indicate the pool this bio came from
*/
#define BIO_POOL_BITS (4)
+#define BIO_POOL_NONE ((1UL << BIO_POOL_BITS) - 1)
#define BIO_POOL_OFFSET (BITS_PER_LONG - BIO_POOL_BITS)
#define BIO_POOL_MASK (1UL << BIO_POOL_OFFSET)
#define BIO_POOL_IDX(bio) ((bio)->bi_flags >> BIO_POOL_OFFSET)
*
* 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
+ * bit 1 -- fail fast device errors
+ * bit 2 -- fail fast transport errors
+ * bit 3 -- fail fast driver errors
+ * bit 4 -- rw-ahead when set
+ * bit 5 -- barrier
* Insert a serialization point in the IO queue, forcing previously
* submitted IO to be completed before this one is issued.
- * bit 3 -- 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 4 -- metadata request
+ * bit 6 -- synchronous I/O hint.
+ * bit 7 -- Unplug the device immediately after submitting this bio.
+ * bit 8 -- metadata request
* Used for tracing to differentiate metadata and data IO. May also
* get some preferential treatment in the IO scheduler
- * bit 5 -- discard sectors
+ * bit 9 -- 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.
- * bit 6 -- fail fast device errors
- * bit 7 -- fail fast transport errors
- * bit 8 -- fail fast driver errors
* Don't want driver retries for any fast fail whatever the reason.
+ * bit 10 -- Tell the IO scheduler not to wait for more requests after this
+ one has been submitted, even if it is a SYNC request.
*/
-#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_SYNCIO 3
-#define BIO_RW_UNPLUG 4
-#define BIO_RW_META 5
-#define BIO_RW_DISCARD 6
-#define BIO_RW_FAILFAST_DEV 7
-#define BIO_RW_FAILFAST_TRANSPORT 8
-#define BIO_RW_FAILFAST_DRIVER 9
-
-#define BIO_RW_SYNC (BIO_RW_SYNCIO | BIO_RW_UNPLUG)
-
-#define bio_rw_flagged(bio, flag) ((bio)->bi_rw & (1 << (flag)))
+enum bio_rw_flags {
+ BIO_RW,
+ BIO_RW_FAILFAST_DEV,
+ BIO_RW_FAILFAST_TRANSPORT,
+ BIO_RW_FAILFAST_DRIVER,
+ /* above flags must match REQ_* */
+ BIO_RW_AHEAD,
+ BIO_RW_BARRIER,
+ BIO_RW_SYNCIO,
+ BIO_RW_UNPLUG,
+ BIO_RW_META,
+ BIO_RW_DISCARD,
+ BIO_RW_NOIDLE,
+};
/*
- * Old defines, these should eventually be replaced by direct usage of
- * bio_rw_flagged()
+ * First four bits must match between bio->bi_rw and rq->cmd_flags, make
+ * that explicit here.
*/
-#define bio_barrier(bio) bio_rw_flagged(bio, BIO_RW_BARRIER)
-#define bio_sync(bio) bio_rw_flagged(bio, BIO_RW_SYNCIO)
-#define bio_unplug(bio) bio_rw_flagged(bio, BIO_RW_UNPLUG)
-#define bio_failfast_dev(bio) bio_rw_flagged(bio, BIO_RW_FAILFAST_DEV)
-#define bio_failfast_transport(bio) \
- bio_rw_flagged(bio, BIO_RW_FAILFAST_TRANSPORT)
-#define bio_failfast_driver(bio) \
- bio_rw_flagged(bio, BIO_RW_FAILFAST_DRIVER)
-#define bio_rw_ahead(bio) bio_rw_flagged(bio, BIO_RW_AHEAD)
-#define bio_rw_meta(bio) bio_rw_flagged(bio, BIO_RW_META)
-#define bio_discard(bio) bio_rw_flagged(bio, BIO_RW_DISCARD)
+#define BIO_RW_RQ_MASK 0xf
+
+static inline bool bio_rw_flagged(struct bio *bio, enum bio_rw_flags flag)
+{
+ return (bio->bi_rw & (1 << flag)) != 0;
+}
/*
* upper 16 bits of bi_rw define the io priority of this bio
#define bio_offset(bio) bio_iovec((bio))->bv_offset
#define bio_segments(bio) ((bio)->bi_vcnt - (bio)->bi_idx)
#define bio_sectors(bio) ((bio)->bi_size >> 9)
-#define bio_empty_barrier(bio) (bio_barrier(bio) && !bio_has_data(bio) && !bio_discard(bio))
+#define bio_empty_barrier(bio) (bio_rw_flagged(bio, BIO_RW_BARRIER) && !bio_has_data(bio) && !bio_rw_flagged(bio, BIO_RW_DISCARD))
-static inline unsigned int bio_cur_sectors(struct bio *bio)
+static inline unsigned int bio_cur_bytes(struct bio *bio)
{
if (bio->bi_vcnt)
- return bio_iovec(bio)->bv_len >> 9;
+ return bio_iovec(bio)->bv_len;
else /* dataless requests such as discard */
- return bio->bi_size >> 9;
+ return bio->bi_size;
}
static inline void *bio_data(struct bio *bio)
#define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \
(((addr1) | (mask)) == (((addr2) - 1) | (mask)))
#define BIOVEC_SEG_BOUNDARY(q, b1, b2) \
- __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, (q)->seg_boundary_mask)
+ __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, queue_segment_boundary((q)))
#define BIO_SEG_BOUNDARY(q, b1, b2) \
BIOVEC_SEG_BOUNDARY((q), __BVEC_END((b1)), __BVEC_START((b2)))
*/
struct bio_integrity_payload {
struct bio *bip_bio; /* parent bio */
- struct bio_vec *bip_vec; /* integrity data vector */
sector_t bip_sector; /* virtual start sector */
unsigned int bip_size;
- unsigned short bip_pool; /* pool the ivec came from */
+ unsigned short bip_slab; /* slab the bip came from */
unsigned short bip_vcnt; /* # of integrity bio_vecs */
unsigned short bip_idx; /* current bip_vec index */
struct work_struct bip_work; /* I/O completion */
+ struct bio_vec bip_vec[0]; /* embedded bvec array */
};
#endif /* CONFIG_BLK_DEV_INTEGRITY */
*
* This function MUST be inlined - it plays with the CPU interrupt flags.
*/
-static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags)
+static __always_inline char *bvec_kmap_irq(struct bio_vec *bvec,
+ unsigned long *flags)
{
unsigned long addr;
return (char *) addr + bvec->bv_offset;
}
-static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags)
+static __always_inline void bvec_kunmap_irq(char *buffer,
+ unsigned long *flags)
{
unsigned long ptr = (unsigned long) buffer & PAGE_MASK;
return bio && bio->bi_io_vec != NULL;
}
+/*
+ * BIO list management for use by remapping drivers (e.g. DM or MD) and loop.
+ *
+ * A bio_list anchors a singly-linked list of bios chained through the bi_next
+ * member of the bio. The bio_list also caches the last list member to allow
+ * fast access to the tail.
+ */
+struct bio_list {
+ struct bio *head;
+ struct bio *tail;
+};
+
+static inline int bio_list_empty(const struct bio_list *bl)
+{
+ return bl->head == NULL;
+}
+
+static inline void bio_list_init(struct bio_list *bl)
+{
+ bl->head = bl->tail = NULL;
+}
+
+#define bio_list_for_each(bio, bl) \
+ for (bio = (bl)->head; bio; bio = bio->bi_next)
+
+static inline unsigned bio_list_size(const struct bio_list *bl)
+{
+ unsigned sz = 0;
+ struct bio *bio;
+
+ bio_list_for_each(bio, bl)
+ sz++;
+
+ return sz;
+}
+
+static inline void bio_list_add(struct bio_list *bl, struct bio *bio)
+{
+ bio->bi_next = NULL;
+
+ if (bl->tail)
+ bl->tail->bi_next = bio;
+ else
+ bl->head = bio;
+
+ bl->tail = bio;
+}
+
+static inline void bio_list_add_head(struct bio_list *bl, struct bio *bio)
+{
+ bio->bi_next = bl->head;
+
+ bl->head = bio;
+
+ if (!bl->tail)
+ bl->tail = bio;
+}
+
+static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2)
+{
+ if (!bl2->head)
+ return;
+
+ if (bl->tail)
+ bl->tail->bi_next = bl2->head;
+ else
+ bl->head = bl2->head;
+
+ bl->tail = bl2->tail;
+}
+
+static inline void bio_list_merge_head(struct bio_list *bl,
+ struct bio_list *bl2)
+{
+ if (!bl2->head)
+ return;
+
+ if (bl->head)
+ bl2->tail->bi_next = bl->head;
+ else
+ bl->tail = bl2->tail;
+
+ bl->head = bl2->head;
+}
+
+static inline struct bio *bio_list_peek(struct bio_list *bl)
+{
+ return bl->head;
+}
+
+static inline struct bio *bio_list_pop(struct bio_list *bl)
+{
+ struct bio *bio = bl->head;
+
+ if (bio) {
+ bl->head = bl->head->bi_next;
+ if (!bl->head)
+ bl->tail = NULL;
+
+ bio->bi_next = NULL;
+ }
+
+ return bio;
+}
+
+static inline struct bio *bio_list_get(struct bio_list *bl)
+{
+ struct bio *bio = bl->head;
+
+ bl->head = bl->tail = NULL;
+
+ return bio;
+}
+
#if defined(CONFIG_BLK_DEV_INTEGRITY)
#define bip_vec_idx(bip, idx) (&(bip->bip_vec[(idx)]))
extern void bio_integrity_advance(struct bio *, unsigned int);
extern void bio_integrity_trim(struct bio *, unsigned int, unsigned int);
extern void bio_integrity_split(struct bio *, struct bio_pair *, int);
-extern int bio_integrity_clone(struct bio *, struct bio *, struct bio_set *);
+extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t, struct bio_set *);
extern int bioset_integrity_create(struct bio_set *, int);
extern void bioset_integrity_free(struct bio_set *);
-extern void bio_integrity_init_slab(void);
+extern void bio_integrity_init(void);
#else /* CONFIG_BLK_DEV_INTEGRITY */
#define bioset_integrity_create(a, b) (0)
#define bio_integrity_prep(a) (0)
#define bio_integrity_enabled(a) (0)
-#define bio_integrity_clone(a, b, c) (0)
+#define bio_integrity_clone(a, b, c, d) (0)
#define bioset_integrity_free(a) do { } while (0)
#define bio_integrity_free(a, b) do { } while (0)
#define bio_integrity_endio(a, b) do { } while (0)
#define bio_integrity_split(a, b, c) do { } while (0)
#define bio_integrity_set_tag(a, b, c) do { } while (0)
#define bio_integrity_get_tag(a, b, c) do { } while (0)
-#define bio_integrity_init_slab(a) do { } while (0)
+#define bio_integrity_init(a) do { } while (0)
#endif /* CONFIG_BLK_DEV_INTEGRITY */
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff