Skip to content

Commit

Permalink
Linux 4.8 compat: REQ_OP and bio_set_op_attrs()
Browse files Browse the repository at this point in the history 
New REQ_OP_* definitions have been introduced to separate the
WRITE, READ, and DISCARD operations from the flags.  This included
changing the encoding of bi_rw.  It places REQ_OP_* in high order
bits and other stuff in low order bits.  This encoding is done
through the new helper function bio_set_op_attrs.  For complete
details refer to:

torvalds/linux@f215082
torvalds/linux@4e1b2d5

Signed-off-by: Tim Chase <[email protected]>
Signed-off-by: Chunwei Chen <[email protected]>
Signed-off-by: Brian Behlendorf <[email protected]>
Closes openzfs#4892
Closes openzfs#4899
  • Loading branch information
@nedbass
Chunwei Chen authored and nedbass committed Sep 9, 2016
1 parent a0591c4 commit 6ae0dbd
Show file tree
Hide file tree
Showing 4 changed files with 49 additions and 26 deletions.
25 changes: 20 additions & 5 deletions include/linux/blkdev_compat.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -332,15 +332,30 @@ bio_set_flags_failfast(struct block_device *bdev, int *flags)
#endif

/*
* 2.6.32 API change
* Use the normal I/O patch for discards.
* 2.6.28 - 2.6.35 API,
* BIO_RW_DISCARD
*
* 2.6.36 - 4.7 API,
* REQ_DISCARD
*
* 4.8 - 4.x API,
* REQ_OP_DISCARD
*
* In all cases the normal I/O path is used for discards. The only
* difference is how the kernel tags individual I/Os as discards.
*/
#ifdef QUEUE_FLAG_DISCARD
#ifdef HAVE_BIO_RW_DISCARD
#define VDEV_REQ_DISCARD (1 << BIO_RW_DISCARD)
static inline boolean_t
bio_is_discard(struct bio *bio)
{
#if defined(HAVE_BIO_RW_DISCARD)
return (bio->bi_rw & (1 << BIO_RW_DISCARD));
#elif defined(REQ_DISCARD)
return (bio->bi_rw & REQ_DISCARD);
#else
#define VDEV_REQ_DISCARD REQ_DISCARD
return (bio_op(bio) == REQ_OP_DISCARD);
#endif
}
#else
#error "Allowing the build will cause discard requests to become writes "
"potentially triggering the DMU_MAX_ACCESS assertion. Please file a "
Expand Down
2 changes: 1 addition & 1 deletion include/sys/vdev_disk.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -38,7 +38,7 @@ typedef struct vdev_disk {
} vdev_disk_t;

extern int vdev_disk_physio(struct block_device *, caddr_t,
size_t, uint64_t, int);
size_t, uint64_t, int, int);
extern int vdev_disk_read_rootlabel(char *, char *, nvlist_t **);

#endif /* _KERNEL */
Expand Down
46 changes: 27 additions & 19 deletions module/zfs/vdev_disk.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -494,41 +494,45 @@ bio_map(struct bio *bio, void *bio_ptr, unsigned int bio_size)
return (bio_size);
}

#ifndef bio_set_op_attrs
#define bio_set_op_attrs(bio, rw, flags) \
do { (bio)->bi_rw |= (rw)|(flags); } while (0)
#endif

static inline void
vdev_submit_bio_impl(int rw, struct bio *bio)
vdev_submit_bio_impl(struct bio *bio)
{
#ifdef HAVE_1ARG_SUBMIT_BIO
bio->bi_rw |= rw;
submit_bio(bio);
#else
submit_bio(rw, bio);
submit_bio(0, bio);
#endif
}

static inline void
vdev_submit_bio(int rw, struct bio *bio)
vdev_submit_bio(struct bio *bio)
{
#ifdef HAVE_CURRENT_BIO_TAIL
struct bio **bio_tail = current->bio_tail;
current->bio_tail = NULL;
vdev_submit_bio_impl(rw, bio);
vdev_submit_bio_impl(bio);
current->bio_tail = bio_tail;
#else
struct bio_list *bio_list = current->bio_list;
current->bio_list = NULL;
vdev_submit_bio_impl(rw, bio);
vdev_submit_bio_impl(bio);
current->bio_list = bio_list;
#endif
}

static int
__vdev_disk_physio(struct block_device *bdev, zio_t *zio, caddr_t kbuf_ptr,
size_t kbuf_size, uint64_t kbuf_offset, int flags, int wait)
size_t kbuf_size, uint64_t kbuf_offset, int rw, int flags, int wait)
{
dio_request_t *dr;
caddr_t bio_ptr;
uint64_t bio_offset;
int rw, bio_size, bio_count = 16;
int bio_size, bio_count = 16;
int i = 0, error = 0;

ASSERT3U(kbuf_offset + kbuf_size, <=, bdev->bd_inode->i_size);
Expand All @@ -541,7 +545,6 @@ __vdev_disk_physio(struct block_device *bdev, zio_t *zio, caddr_t kbuf_ptr,
if (zio && !(zio->io_flags & (ZIO_FLAG_IO_RETRY | ZIO_FLAG_TRYHARD)))
bio_set_flags_failfast(bdev, &flags);

rw = flags;
dr->dr_zio = zio;
dr->dr_wait = wait;

Expand Down Expand Up @@ -585,9 +588,9 @@ __vdev_disk_physio(struct block_device *bdev, zio_t *zio, caddr_t kbuf_ptr,

dr->dr_bio[i]->bi_bdev = bdev;
BIO_BI_SECTOR(dr->dr_bio[i]) = bio_offset >> 9;
dr->dr_bio[i]->bi_rw = rw;
dr->dr_bio[i]->bi_end_io = vdev_disk_physio_completion;
dr->dr_bio[i]->bi_private = dr;
bio_set_op_attrs(dr->dr_bio[i], rw, flags);

/* Remaining size is returned to become the new size */
bio_size = bio_map(dr->dr_bio[i], bio_ptr, bio_size);
Expand All @@ -605,7 +608,7 @@ __vdev_disk_physio(struct block_device *bdev, zio_t *zio, caddr_t kbuf_ptr,
/* Submit all bio's associated with this dio */
for (i = 0; i < dr->dr_bio_count; i++)
if (dr->dr_bio[i])
vdev_submit_bio(rw, dr->dr_bio[i]);
vdev_submit_bio(dr->dr_bio[i]);

/*
* On synchronous blocking requests we wait for all bio the completion
Expand All @@ -628,10 +631,11 @@ __vdev_disk_physio(struct block_device *bdev, zio_t *zio, caddr_t kbuf_ptr,

int
vdev_disk_physio(struct block_device *bdev, caddr_t kbuf,
size_t size, uint64_t offset, int flags)
size_t size, uint64_t offset, int rw, int flags)
{
bio_set_flags_failfast(bdev, &flags);
return (__vdev_disk_physio(bdev, NULL, kbuf, size, offset, flags, 1));
return (__vdev_disk_physio(bdev, NULL, kbuf, size, offset, rw, flags,
1));
}

BIO_END_IO_PROTO(vdev_disk_io_flush_completion, bio, rc)
Expand Down Expand Up @@ -672,7 +676,8 @@ vdev_disk_io_flush(struct block_device *bdev, zio_t *zio)
bio->bi_private = zio;
bio->bi_bdev = bdev;
zio->io_delay = jiffies_64;
vdev_submit_bio(VDEV_WRITE_FLUSH_FUA, bio);
bio_set_op_attrs(bio, 0, VDEV_WRITE_FLUSH_FUA);
vdev_submit_bio(bio);
invalidate_bdev(bdev);

return (0);
Expand All @@ -684,7 +689,7 @@ vdev_disk_io_start(zio_t *zio)
vdev_t *v = zio->io_vd;
vdev_disk_t *vd = v->vdev_tsd;
zio_priority_t pri = zio->io_priority;
int flags, error;
int rw, flags, error;

switch (zio->io_type) {
case ZIO_TYPE_IOCTL:
Expand Down Expand Up @@ -723,17 +728,19 @@ vdev_disk_io_start(zio_t *zio)
zio_execute(zio);
return;
case ZIO_TYPE_WRITE:
rw = WRITE;
if ((pri == ZIO_PRIORITY_SYNC_WRITE) && (v->vdev_nonrot))
flags = WRITE_SYNC;
else
flags = WRITE;
flags = 0;
break;

case ZIO_TYPE_READ:
rw = READ;
if ((pri == ZIO_PRIORITY_SYNC_READ) && (v->vdev_nonrot))
flags = READ_SYNC;
else
flags = READ;
flags = 0;
break;

default:
Expand All @@ -743,7 +750,7 @@ vdev_disk_io_start(zio_t *zio)
}

error = __vdev_disk_physio(vd->vd_bdev, zio, zio->io_data,
zio->io_size, zio->io_offset, flags, 0);
zio->io_size, zio->io_offset, rw, flags, 0);
if (error) {
zio->io_error = error;
zio_interrupt(zio);
Expand Down Expand Up @@ -844,7 +851,8 @@ vdev_disk_read_rootlabel(char *devpath, char *devid, nvlist_t **config)
/* read vdev label */
offset = vdev_label_offset(size, i, 0);
if (vdev_disk_physio(bdev, (caddr_t)label,
VDEV_SKIP_SIZE + VDEV_PHYS_SIZE, offset, READ_SYNC) != 0)
VDEV_SKIP_SIZE + VDEV_PHYS_SIZE, offset, READ,
REQ_SYNC) != 0)
continue;

if (nvlist_unpack(label->vl_vdev_phys.vp_nvlist,
Expand Down
2 changes: 1 addition & 1 deletion module/zfs/zvol.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -766,7 +766,7 @@ zvol_request(struct request_queue *q, struct bio *bio)
goto out2;
}

if (bio->bi_rw & VDEV_REQ_DISCARD) {
if (bio_is_discard(bio)) {
error = zvol_discard(bio);
goto out2;
}
Expand Down

0 comments on commit 6ae0dbd

Please sign in to comment.