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author | Linus Torvalds <torvalds@linux-foundation.org> | 2012-12-22 02:08:06 +0100 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-12-22 02:08:06 +0100 |
commit | b49249d10324d0fd6fb29725c2807dfd80d0edbc (patch) | |
tree | 9a8fa724e6c9f9283530979c6e32a311c74999d5 /drivers/md/dm-kcopyd.c | |
parent | Revert "nfsd: warn on odd reply state in nfsd_vfs_read" (diff) | |
parent | dm stripe: add WRITE SAME support (diff) | |
download | linux-b49249d10324d0fd6fb29725c2807dfd80d0edbc.tar.xz linux-b49249d10324d0fd6fb29725c2807dfd80d0edbc.zip |
Merge tag 'dm-3.8-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-dm
Pull dm update from Alasdair G Kergon:
"Miscellaneous device-mapper fixes, cleanups and performance
improvements.
Of particular note:
- Disable broken WRITE SAME support in all targets except linear and
striped. Use it when kcopyd is zeroing blocks.
- Remove several mempools from targets by moving the data into the
bio's new front_pad area(which dm calls 'per_bio_data').
- Fix a race in thin provisioning if discards are misused.
- Prevent userspace from interfering with the ioctl parameters and
use kmalloc for the data buffer if it's small instead of vmalloc.
- Throttle some annoying error messages when I/O fails."
* tag 'dm-3.8-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-dm: (36 commits)
dm stripe: add WRITE SAME support
dm: remove map_info
dm snapshot: do not use map_context
dm thin: dont use map_context
dm raid1: dont use map_context
dm flakey: dont use map_context
dm raid1: rename read_record to bio_record
dm: move target request nr to dm_target_io
dm snapshot: use per_bio_data
dm verity: use per_bio_data
dm raid1: use per_bio_data
dm: introduce per_bio_data
dm kcopyd: add WRITE SAME support to dm_kcopyd_zero
dm linear: add WRITE SAME support
dm: add WRITE SAME support
dm: prepare to support WRITE SAME
dm ioctl: use kmalloc if possible
dm ioctl: remove PF_MEMALLOC
dm persistent data: improve improve space map block alloc failure message
dm thin: use DMERR_LIMIT for errors
...
Diffstat (limited to 'drivers/md/dm-kcopyd.c')
-rw-r--r-- | drivers/md/dm-kcopyd.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/drivers/md/dm-kcopyd.c b/drivers/md/dm-kcopyd.c index bed444c93d8d..68c02673263b 100644 --- a/drivers/md/dm-kcopyd.c +++ b/drivers/md/dm-kcopyd.c @@ -349,7 +349,7 @@ static void complete_io(unsigned long error, void *context) struct dm_kcopyd_client *kc = job->kc; if (error) { - if (job->rw == WRITE) + if (job->rw & WRITE) job->write_err |= error; else job->read_err = 1; @@ -361,7 +361,7 @@ static void complete_io(unsigned long error, void *context) } } - if (job->rw == WRITE) + if (job->rw & WRITE) push(&kc->complete_jobs, job); else { @@ -432,7 +432,7 @@ static int process_jobs(struct list_head *jobs, struct dm_kcopyd_client *kc, if (r < 0) { /* error this rogue job */ - if (job->rw == WRITE) + if (job->rw & WRITE) job->write_err = (unsigned long) -1L; else job->read_err = 1; @@ -585,6 +585,7 @@ int dm_kcopyd_copy(struct dm_kcopyd_client *kc, struct dm_io_region *from, unsigned int flags, dm_kcopyd_notify_fn fn, void *context) { struct kcopyd_job *job; + int i; /* * Allocate an array of jobs consisting of one master job @@ -611,7 +612,16 @@ int dm_kcopyd_copy(struct dm_kcopyd_client *kc, struct dm_io_region *from, memset(&job->source, 0, sizeof job->source); job->source.count = job->dests[0].count; job->pages = &zero_page_list; - job->rw = WRITE; + + /* + * Use WRITE SAME to optimize zeroing if all dests support it. + */ + job->rw = WRITE | REQ_WRITE_SAME; + for (i = 0; i < job->num_dests; i++) + if (!bdev_write_same(job->dests[i].bdev)) { + job->rw = WRITE; + break; + } } job->fn = fn; |