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author | Kent Overstreet <kent.overstreet@gmail.com> | 2019-03-11 23:31:06 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-03-12 10:04:02 -0700 |
commit | b330e6a49dc3e9145de5c986b29bbbb884351e92 (patch) | |
tree | 63db17312ade77feb9a1a8d311ce877a87687763 /drivers/md | |
parent | ee9c5e67557f9663b27946ba1d3813fb1924b1fe (diff) | |
download | linux-stable-b330e6a49dc3e9145de5c986b29bbbb884351e92.tar.gz linux-stable-b330e6a49dc3e9145de5c986b29bbbb884351e92.tar.bz2 linux-stable-b330e6a49dc3e9145de5c986b29bbbb884351e92.zip |
md: convert to kvmalloc
The code really just wants a big flat buffer, so just do that.
Link: http://lkml.kernel.org/r/20181217131929.11727-3-kent.overstreet@gmail.com
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Reviewed-by: Matthew Wilcox <willy@infradead.org>
Cc: Shaohua Li <shli@kernel.org>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Eric Paris <eparis@parisplace.org>
Cc: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Cc: Neil Horman <nhorman@tuxdriver.com>
Cc: Paul Moore <paul@paul-moore.com>
Cc: Pravin B Shelar <pshelar@ovn.org>
Cc: Stephen Smalley <sds@tycho.nsa.gov>
Cc: Vlad Yasevich <vyasevich@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/md')
-rw-r--r-- | drivers/md/raid5-ppl.c | 6 | ||||
-rw-r--r-- | drivers/md/raid5.c | 87 | ||||
-rw-r--r-- | drivers/md/raid5.h | 9 |
3 files changed, 46 insertions, 56 deletions
diff --git a/drivers/md/raid5-ppl.c b/drivers/md/raid5-ppl.c index 3a7c36326589..0b096ddc9c1e 100644 --- a/drivers/md/raid5-ppl.c +++ b/drivers/md/raid5-ppl.c @@ -16,7 +16,6 @@ #include <linux/blkdev.h> #include <linux/slab.h> #include <linux/crc32c.h> -#include <linux/flex_array.h> #include <linux/async_tx.h> #include <linux/raid/md_p.h> #include "md.h" @@ -165,7 +164,7 @@ ops_run_partial_parity(struct stripe_head *sh, struct raid5_percpu *percpu, struct dma_async_tx_descriptor *tx) { int disks = sh->disks; - struct page **srcs = flex_array_get(percpu->scribble, 0); + struct page **srcs = percpu->scribble; int count = 0, pd_idx = sh->pd_idx, i; struct async_submit_ctl submit; @@ -196,8 +195,7 @@ ops_run_partial_parity(struct stripe_head *sh, struct raid5_percpu *percpu, } init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, tx, - NULL, sh, flex_array_get(percpu->scribble, 0) - + sizeof(struct page *) * (sh->disks + 2)); + NULL, sh, (void *) (srcs + sh->disks + 2)); if (count == 1) tx = async_memcpy(sh->ppl_page, srcs[0], 0, 0, PAGE_SIZE, diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index cecea901ab8c..77ffd09be486 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -54,7 +54,6 @@ #include <linux/slab.h> #include <linux/ratelimit.h> #include <linux/nodemask.h> -#include <linux/flex_array.h> #include <trace/events/block.h> #include <linux/list_sort.h> @@ -1394,22 +1393,16 @@ static void ops_complete_compute(void *stripe_head_ref) } /* return a pointer to the address conversion region of the scribble buffer */ -static addr_conv_t *to_addr_conv(struct stripe_head *sh, - struct raid5_percpu *percpu, int i) +static struct page **to_addr_page(struct raid5_percpu *percpu, int i) { - void *addr; - - addr = flex_array_get(percpu->scribble, i); - return addr + sizeof(struct page *) * (sh->disks + 2); + return percpu->scribble + i * percpu->scribble_obj_size; } /* return a pointer to the address conversion region of the scribble buffer */ -static struct page **to_addr_page(struct raid5_percpu *percpu, int i) +static addr_conv_t *to_addr_conv(struct stripe_head *sh, + struct raid5_percpu *percpu, int i) { - void *addr; - - addr = flex_array_get(percpu->scribble, i); - return addr; + return (void *) (to_addr_page(percpu, i) + sh->disks + 2); } static struct dma_async_tx_descriptor * @@ -2238,21 +2231,23 @@ static int grow_stripes(struct r5conf *conf, int num) * calculate over all devices (not just the data blocks), using zeros in place * of the P and Q blocks. */ -static struct flex_array *scribble_alloc(int num, int cnt, gfp_t flags) +static int scribble_alloc(struct raid5_percpu *percpu, + int num, int cnt, gfp_t flags) { - struct flex_array *ret; - size_t len; + size_t obj_size = + sizeof(struct page *) * (num+2) + + sizeof(addr_conv_t) * (num+2); + void *scribble; - len = sizeof(struct page *) * (num+2) + sizeof(addr_conv_t) * (num+2); - ret = flex_array_alloc(len, cnt, flags); - if (!ret) - return NULL; - /* always prealloc all elements, so no locking is required */ - if (flex_array_prealloc(ret, 0, cnt, flags)) { - flex_array_free(ret); - return NULL; - } - return ret; + scribble = kvmalloc_array(cnt, obj_size, flags); + if (!scribble) + return -ENOMEM; + + kvfree(percpu->scribble); + + percpu->scribble = scribble; + percpu->scribble_obj_size = obj_size; + return 0; } static int resize_chunks(struct r5conf *conf, int new_disks, int new_sectors) @@ -2270,23 +2265,18 @@ static int resize_chunks(struct r5conf *conf, int new_disks, int new_sectors) return 0; mddev_suspend(conf->mddev); get_online_cpus(); + for_each_present_cpu(cpu) { struct raid5_percpu *percpu; - struct flex_array *scribble; percpu = per_cpu_ptr(conf->percpu, cpu); - scribble = scribble_alloc(new_disks, - new_sectors / STRIPE_SECTORS, - GFP_NOIO); - - if (scribble) { - flex_array_free(percpu->scribble); - percpu->scribble = scribble; - } else { - err = -ENOMEM; + err = scribble_alloc(percpu, new_disks, + new_sectors / STRIPE_SECTORS, + GFP_NOIO); + if (err) break; - } } + put_online_cpus(); mddev_resume(conf->mddev); if (!err) { @@ -6742,25 +6732,26 @@ raid5_size(struct mddev *mddev, sector_t sectors, int raid_disks) static void free_scratch_buffer(struct r5conf *conf, struct raid5_percpu *percpu) { safe_put_page(percpu->spare_page); - if (percpu->scribble) - flex_array_free(percpu->scribble); percpu->spare_page = NULL; + kvfree(percpu->scribble); percpu->scribble = NULL; } static int alloc_scratch_buffer(struct r5conf *conf, struct raid5_percpu *percpu) { - if (conf->level == 6 && !percpu->spare_page) + if (conf->level == 6 && !percpu->spare_page) { percpu->spare_page = alloc_page(GFP_KERNEL); - if (!percpu->scribble) - percpu->scribble = scribble_alloc(max(conf->raid_disks, - conf->previous_raid_disks), - max(conf->chunk_sectors, - conf->prev_chunk_sectors) - / STRIPE_SECTORS, - GFP_KERNEL); - - if (!percpu->scribble || (conf->level == 6 && !percpu->spare_page)) { + if (!percpu->spare_page) + return -ENOMEM; + } + + if (scribble_alloc(percpu, + max(conf->raid_disks, + conf->previous_raid_disks), + max(conf->chunk_sectors, + conf->prev_chunk_sectors) + / STRIPE_SECTORS, + GFP_KERNEL)) { free_scratch_buffer(conf, percpu); return -ENOMEM; } diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h index 8474c224127b..cf991f13403e 100644 --- a/drivers/md/raid5.h +++ b/drivers/md/raid5.h @@ -638,10 +638,11 @@ struct r5conf { /* per cpu variables */ struct raid5_percpu { struct page *spare_page; /* Used when checking P/Q in raid6 */ - struct flex_array *scribble; /* space for constructing buffer - * lists and performing address - * conversions - */ + void *scribble; /* space for constructing buffer + * lists and performing address + * conversions + */ + int scribble_obj_size; } __percpu *percpu; int scribble_disks; int scribble_sectors; |