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block: Consolidate duplicated bio_trim() implementations

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Someone cut and pasted md's md_trim_bio() into xen-blkfront.c. Come on,
we should know better than this.

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Neil Brown <neilb@suse.de>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Kent Overstreet 2013-08-07 11:14:32 -07:00 committed by Jens Axboe
parent e0ce0eacb3
commit 6678d83f18
7 changed files with 61 additions and 108 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

53
drivers/block/xen-blkfront.c
View File

@ -1336,57 +1336,6 @@ static int blkfront_probe(struct xenbus_device *dev,
return 0;
}
/*
* This is a clone of md_trim_bio, used to split a bio into smaller ones
*/
static void trim_bio(struct bio *bio, int offset, int size)
{
/* 'bio' is a cloned bio which we need to trim to match
* the given offset and size.
* This requires adjusting bi_sector, bi_size, and bi_io_vec
*/
int i;
struct bio_vec *bvec;
int sofar = 0;
size <<= 9;
if (offset == 0 && size == bio->bi_size)
return;
bio->bi_sector += offset;
bio->bi_size = size;
offset <<= 9;
clear_bit(BIO_SEG_VALID, &bio->bi_flags);
while (bio->bi_idx < bio->bi_vcnt &&
bio->bi_io_vec[bio->bi_idx].bv_len <= offset) {
/* remove this whole bio_vec */
offset -= bio->bi_io_vec[bio->bi_idx].bv_len;
bio->bi_idx++;
}
if (bio->bi_idx < bio->bi_vcnt) {
bio->bi_io_vec[bio->bi_idx].bv_offset += offset;
bio->bi_io_vec[bio->bi_idx].bv_len -= offset;
}
/* avoid any complications with bi_idx being non-zero*/
if (bio->bi_idx) {
memmove(bio->bi_io_vec, bio->bi_io_vec+bio->bi_idx,
(bio->bi_vcnt - bio->bi_idx) * sizeof(struct bio_vec));
bio->bi_vcnt -= bio->bi_idx;
bio->bi_idx = 0;
}
/* Make sure vcnt and last bv are not too big */
bio_for_each_segment(bvec, bio, i) {
if (sofar + bvec->bv_len > size)
bvec->bv_len = size - sofar;
if (bvec->bv_len == 0) {
bio->bi_vcnt = i;
break;
}
sofar += bvec->bv_len;
}
}
static void split_bio_end(struct bio *bio, int error)
{
struct split_bio *split_bio = bio->bi_private;
@ -1522,7 +1471,7 @@ static int blkif_recover(struct blkfront_info *info)
(unsigned int)(bio->bi_size >> 9) - offset);
cloned_bio = bio_clone(bio, GFP_NOIO);
BUG_ON(cloned_bio == NULL);
trim_bio(cloned_bio, offset, size);
bio_trim(cloned_bio, offset, size);
cloned_bio->bi_private = split_bio;
cloned_bio->bi_end_io = split_bio_end;
submit_bio(cloned_bio->bi_rw, cloned_bio);

40
drivers/md/md.c
View File

@ -183,46 +183,6 @@ struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask,
}
EXPORT_SYMBOL_GPL(bio_clone_mddev);
void md_trim_bio(struct bio *bio, int offset, int size)
{
/* 'bio' is a cloned bio which we need to trim to match
* the given offset and size.
* This requires adjusting bi_sector, bi_size, and bi_io_vec
*/
int i;
struct bio_vec *bvec;
int sofar = 0;
size <<= 9;
if (offset == 0 && size == bio->bi_size)
return;
clear_bit(BIO_SEG_VALID, &bio->bi_flags);
bio_advance(bio, offset << 9);
bio->bi_size = size;
/* avoid any complications with bi_idx being non-zero*/
if (bio->bi_idx) {
memmove(bio->bi_io_vec, bio->bi_io_vec+bio->bi_idx,
(bio->bi_vcnt - bio->bi_idx) * sizeof(struct bio_vec));
bio->bi_vcnt -= bio->bi_idx;
bio->bi_idx = 0;
}
/* Make sure vcnt and last bv are not too big */
bio_for_each_segment(bvec, bio, i) {
if (sofar + bvec->bv_len > size)
bvec->bv_len = size - sofar;
if (bvec->bv_len == 0) {
bio->bi_vcnt = i;
break;
}
sofar += bvec->bv_len;
}
}
EXPORT_SYMBOL_GPL(md_trim_bio);
/*
* We have a system wide 'event count' that is incremented
* on any 'interesting' event, and readers of /proc/mdstat

1
drivers/md/md.h
View File

@ -617,7 +617,6 @@ extern struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask,
struct mddev *mddev);
extern struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
struct mddev *mddev);
extern void md_trim_bio(struct bio *bio, int offset, int size);
extern void md_unplug(struct blk_plug_cb *cb, bool from_schedule);
static inline int mddev_check_plugged(struct mddev *mddev)

10
drivers/md/raid1.c
View File

@ -1097,8 +1097,8 @@ static void make_request(struct mddev *mddev, struct bio * bio)
r1_bio->read_disk = rdisk;
read_bio = bio_clone_mddev(bio, GFP_NOIO, mddev);
md_trim_bio(read_bio, r1_bio->sector - bio->bi_sector,
max_sectors);
bio_trim(read_bio, r1_bio->sector - bio->bi_sector,
max_sectors);
r1_bio->bios[rdisk] = read_bio;
@ -1266,7 +1266,7 @@ static void make_request(struct mddev *mddev, struct bio * bio)
continue;
mbio = bio_clone_mddev(bio, GFP_NOIO, mddev);
md_trim_bio(mbio, r1_bio->sector - bio->bi_sector, max_sectors);
bio_trim(mbio, r1_bio->sector - bio->bi_sector, max_sectors);
if (first_clone) {
/* do behind I/O ?
@ -2126,7 +2126,7 @@ static int narrow_write_error(struct r1bio *r1_bio, int i)
wbio->bi_sector = r1_bio->sector;
wbio->bi_size = r1_bio->sectors << 9;
md_trim_bio(wbio, sector - r1_bio->sector, sectors);
bio_trim(wbio, sector - r1_bio->sector, sectors);
wbio->bi_sector += rdev->data_offset;
wbio->bi_bdev = rdev->bdev;
if (submit_bio_wait(WRITE, wbio) == 0)
@ -2241,7 +2241,7 @@ static void handle_read_error(struct r1conf *conf, struct r1bio *r1_bio)
}
r1_bio->read_disk = disk;
bio = bio_clone_mddev(r1_bio->master_bio, GFP_NOIO, mddev);
md_trim_bio(bio, r1_bio->sector - bio->bi_sector, max_sectors);
bio_trim(bio, r1_bio->sector - bio->bi_sector, max_sectors);
r1_bio->bios[r1_bio->read_disk] = bio;
rdev = conf->mirrors[disk].rdev;
printk_ratelimited(KERN_ERR

18
drivers/md/raid10.c
View File

@ -1302,8 +1302,8 @@ static void make_request(struct mddev *mddev, struct bio * bio)
slot = r10_bio->read_slot;
read_bio = bio_clone_mddev(bio, GFP_NOIO, mddev);
md_trim_bio(read_bio, r10_bio->sector - bio->bi_sector,
max_sectors);
bio_trim(read_bio, r10_bio->sector - bio->bi_sector,
max_sectors);
r10_bio->devs[slot].bio = read_bio;
r10_bio->devs[slot].rdev = rdev;
@ -1510,8 +1510,8 @@ static void make_request(struct mddev *mddev, struct bio * bio)
if (r10_bio->devs[i].bio) {
struct md_rdev *rdev = conf->mirrors[d].rdev;
mbio = bio_clone_mddev(bio, GFP_NOIO, mddev);
md_trim_bio(mbio, r10_bio->sector - bio->bi_sector,
max_sectors);
bio_trim(mbio, r10_bio->sector - bio->bi_sector,
max_sectors);
r10_bio->devs[i].bio = mbio;
mbio->bi_sector = (r10_bio->devs[i].addr+
@ -1553,8 +1553,8 @@ static void make_request(struct mddev *mddev, struct bio * bio)
rdev = conf->mirrors[d].rdev;
}
mbio = bio_clone_mddev(bio, GFP_NOIO, mddev);
md_trim_bio(mbio, r10_bio->sector - bio->bi_sector,
max_sectors);
bio_trim(mbio, r10_bio->sector - bio->bi_sector,
max_sectors);
r10_bio->devs[i].repl_bio = mbio;
mbio->bi_sector = (r10_bio->devs[i].addr +
@ -2614,7 +2614,7 @@ static int narrow_write_error(struct r10bio *r10_bio, int i)
sectors = sect_to_write;
/* Write at 'sector' for 'sectors' */
wbio = bio_clone_mddev(bio, GFP_NOIO, mddev);
md_trim_bio(wbio, sector - bio->bi_sector, sectors);
bio_trim(wbio, sector - bio->bi_sector, sectors);
wbio->bi_sector = (r10_bio->devs[i].addr+
choose_data_offset(r10_bio, rdev) +
(sector - r10_bio->sector));
@ -2687,9 +2687,7 @@ static void handle_read_error(struct mddev *mddev, struct r10bio *r10_bio)
(unsigned long long)r10_bio->sector);
bio = bio_clone_mddev(r10_bio->master_bio,
GFP_NOIO, mddev);
md_trim_bio(bio,
r10_bio->sector - bio->bi_sector,
max_sectors);
bio_trim(bio, r10_bio->sector - bio->bi_sector, max_sectors);
r10_bio->devs[slot].bio = bio;
r10_bio->devs[slot].rdev = rdev;
bio->bi_sector = r10_bio->devs[slot].addr

46
fs/bio.c
View File

@ -1804,6 +1804,52 @@ struct bio_pair *bio_split(struct bio *bi, int first_sectors)
}
EXPORT_SYMBOL(bio_split);
/**
* bio_trim - trim a bio
* @bio: bio to trim
* @offset: number of sectors to trim from the front of @bio
* @size: size we want to trim @bio to, in sectors
*/
void bio_trim(struct bio *bio, int offset, int size)
{
/* 'bio' is a cloned bio which we need to trim to match
* the given offset and size.
* This requires adjusting bi_sector, bi_size, and bi_io_vec
*/
int i;
struct bio_vec *bvec;
int sofar = 0;
size <<= 9;
if (offset == 0 && size == bio->bi_size)
return;
clear_bit(BIO_SEG_VALID, &bio->bi_flags);
bio_advance(bio, offset << 9);
bio->bi_size = size;
/* avoid any complications with bi_idx being non-zero*/
if (bio->bi_idx) {
memmove(bio->bi_io_vec, bio->bi_io_vec+bio->bi_idx,
(bio->bi_vcnt - bio->bi_idx) * sizeof(struct bio_vec));
bio->bi_vcnt -= bio->bi_idx;
bio->bi_idx = 0;
}
/* Make sure vcnt and last bv are not too big */
bio_for_each_segment(bvec, bio, i) {
if (sofar + bvec->bv_len > size)
bvec->bv_len = size - sofar;
if (bvec->bv_len == 0) {
bio->bi_vcnt = i;
break;
}
sofar += bvec->bv_len;
}
}
EXPORT_SYMBOL_GPL(bio_trim);
/**
* bio_sector_offset - Find hardware sector offset in bio
* @bio: bio to inspect

1
include/linux/bio.h
View File

@ -218,6 +218,7 @@ struct bio_pair {
};
extern struct bio_pair *bio_split(struct bio *bi, int first_sectors);
extern void bio_pair_release(struct bio_pair *dbio);
extern void bio_trim(struct bio *bio, int offset, int size);
extern struct bio_set *bioset_create(unsigned int, unsigned int);
extern void bioset_free(struct bio_set *);