From 34053979fb1d923217685cf166349f1899980581 Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Sat, 21 Feb 2009 11:16:36 +0100 Subject: block: cleanup bio_alloc_bioset() MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit this warning (which got fixed by commit b2bf968): fs/bio.c: In function ‘bio_alloc_bioset’: fs/bio.c:305: warning: ‘p’ may be used uninitialized in this function Triggered because the code flow in bio_alloc_bioset() is correct but a bit complex for the compiler to see through. Streamline it a bit - this also makes the code a tiny bit more compact: text data bss dec hex filename 7540 256 40 7836 1e9c bio.o.before 7539 256 40 7835 1e9b bio.o.after Also remove an older compiler-warnings annotation from this function, it's not needed. Signed-off-by: Ingo Molnar Signed-off-by: Jens Axboe --- fs/bio.c | 71 +++++++++++++++++++++++++++++++++------------------------------- 1 file changed, 37 insertions(+), 34 deletions(-) (limited to 'fs') diff --git a/fs/bio.c b/fs/bio.c index d4f06327c810..cef6258b8943 100644 --- a/fs/bio.c +++ b/fs/bio.c @@ -301,48 +301,51 @@ void bio_init(struct bio *bio) **/ struct bio *bio_alloc_bioset(gfp_t gfp_mask, int nr_iovecs, struct bio_set *bs) { + struct bio_vec *bvl = NULL; struct bio *bio = NULL; - void *uninitialized_var(p); + unsigned long idx = 0; + void *p = NULL; if (bs) { p = mempool_alloc(bs->bio_pool, gfp_mask); - - if (p) - bio = p + bs->front_pad; - } else + if (!p) + goto err; + bio = p + bs->front_pad; + } else { bio = kmalloc(sizeof(*bio), gfp_mask); + if (!bio) + goto err; + } - if (likely(bio)) { - struct bio_vec *bvl = NULL; - - bio_init(bio); - if (likely(nr_iovecs)) { - unsigned long uninitialized_var(idx); - - if (nr_iovecs <= BIO_INLINE_VECS) { - idx = 0; - bvl = bio->bi_inline_vecs; - nr_iovecs = BIO_INLINE_VECS; - } else { - bvl = bvec_alloc_bs(gfp_mask, nr_iovecs, &idx, - bs); - nr_iovecs = bvec_nr_vecs(idx); - } - if (unlikely(!bvl)) { - if (bs) - mempool_free(p, bs->bio_pool); - else - kfree(bio); - bio = NULL; - goto out; - } - bio->bi_flags |= idx << BIO_POOL_OFFSET; - bio->bi_max_vecs = nr_iovecs; - } - bio->bi_io_vec = bvl; + bio_init(bio); + + if (unlikely(!nr_iovecs)) + goto out_set; + + if (nr_iovecs <= BIO_INLINE_VECS) { + bvl = bio->bi_inline_vecs; + nr_iovecs = BIO_INLINE_VECS; + } else { + bvl = bvec_alloc_bs(gfp_mask, nr_iovecs, &idx, bs); + if (unlikely(!bvl)) + goto err_free; + + nr_iovecs = bvec_nr_vecs(idx); } -out: + bio->bi_flags |= idx << BIO_POOL_OFFSET; + bio->bi_max_vecs = nr_iovecs; +out_set: + bio->bi_io_vec = bvl; + return bio; + +err_free: + if (bs) + mempool_free(p, bs->bio_pool); + else + kfree(bio); +err: + return NULL; } struct bio *bio_alloc(gfp_t gfp_mask, int nr_iovecs) -- cgit v1.2.2 From a7fcd37cdcb47806fb8a9070f006ee34061defa6 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Fri, 5 Dec 2008 16:10:29 +0100 Subject: block: don't create bio_vec slabs of less than the inline number If we don't have CONFIG_BLK_DEV_INTEGRITY set, then we don't have any external dependencies on the bio_vec slabs. So don't create the ones that we will inline anyway. Signed-off-by: Jens Axboe --- fs/bio.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'fs') diff --git a/fs/bio.c b/fs/bio.c index cef6258b8943..9cc1430b4495 100644 --- a/fs/bio.c +++ b/fs/bio.c @@ -1589,6 +1589,13 @@ static void __init biovec_init_slabs(void) int size; struct biovec_slab *bvs = bvec_slabs + i; +#ifndef CONFIG_BLK_DEV_INTEGRITY + if (bvs->nr_vecs <= BIO_INLINE_VECS) { + bvs->slab = NULL; + continue; + } +#endif + size = bvs->nr_vecs * sizeof(struct bio_vec); bvs->slab = kmem_cache_create(bvs->name, size, 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); -- cgit v1.2.2 From 6d2a78e783416ba99e36beb1d4395b785b34e867 Mon Sep 17 00:00:00 2001 From: "Martin K. Petersen" Date: Tue, 10 Mar 2009 08:27:39 +0100 Subject: block: add private bio_set for bio integrity allocations The integrity bio allocation needs its own bio_set to avoid violating the mempool allocation rules and risking deadlocks. Signed-off-by: Martin K. Petersen Signed-off-by: Jens Axboe --- fs/bio-integrity.c | 85 +++++++++++++++++------------------------------------- fs/bio.c | 9 ++---- 2 files changed, 28 insertions(+), 66 deletions(-) (limited to 'fs') diff --git a/fs/bio-integrity.c b/fs/bio-integrity.c index fe2b1aa2464e..31c46a241bac 100644 --- a/fs/bio-integrity.c +++ b/fs/bio-integrity.c @@ -26,23 +26,23 @@ #include static struct kmem_cache *bio_integrity_slab __read_mostly; +static mempool_t *bio_integrity_pool; +static struct bio_set *integrity_bio_set; static struct workqueue_struct *kintegrityd_wq; /** - * bio_integrity_alloc_bioset - Allocate integrity payload and attach it to bio + * bio_integrity_alloc - Allocate integrity payload and attach it to bio * @bio: bio to attach integrity metadata to * @gfp_mask: Memory allocation mask * @nr_vecs: Number of integrity metadata scatter-gather elements - * @bs: bio_set to allocate from * * Description: This function prepares a bio for attaching integrity * metadata. nr_vecs specifies the maximum number of pages containing * integrity metadata that can be attached. */ -struct bio_integrity_payload *bio_integrity_alloc_bioset(struct bio *bio, - gfp_t gfp_mask, - unsigned int nr_vecs, - struct bio_set *bs) +struct bio_integrity_payload *bio_integrity_alloc(struct bio *bio, + gfp_t gfp_mask, + unsigned int nr_vecs) { struct bio_integrity_payload *bip; struct bio_vec *iv; @@ -50,7 +50,7 @@ struct bio_integrity_payload *bio_integrity_alloc_bioset(struct bio *bio, BUG_ON(bio == NULL); - bip = mempool_alloc(bs->bio_integrity_pool, gfp_mask); + bip = mempool_alloc(bio_integrity_pool, gfp_mask); if (unlikely(bip == NULL)) { printk(KERN_ERR "%s: could not alloc bip\n", __func__); return NULL; @@ -58,10 +58,10 @@ struct bio_integrity_payload *bio_integrity_alloc_bioset(struct bio *bio, memset(bip, 0, sizeof(*bip)); - iv = bvec_alloc_bs(gfp_mask, nr_vecs, &idx, bs); + iv = bvec_alloc_bs(gfp_mask, nr_vecs, &idx, integrity_bio_set); if (unlikely(iv == NULL)) { printk(KERN_ERR "%s: could not alloc bip_vec\n", __func__); - mempool_free(bip, bs->bio_integrity_pool); + mempool_free(bip, bio_integrity_pool); return NULL; } @@ -72,35 +72,16 @@ struct bio_integrity_payload *bio_integrity_alloc_bioset(struct bio *bio, return bip; } -EXPORT_SYMBOL(bio_integrity_alloc_bioset); - -/** - * bio_integrity_alloc - Allocate integrity payload and attach it to bio - * @bio: bio to attach integrity metadata to - * @gfp_mask: Memory allocation mask - * @nr_vecs: Number of integrity metadata scatter-gather elements - * - * Description: This function prepares a bio for attaching integrity - * metadata. nr_vecs specifies the maximum number of pages containing - * integrity metadata that can be attached. - */ -struct bio_integrity_payload *bio_integrity_alloc(struct bio *bio, - gfp_t gfp_mask, - unsigned int nr_vecs) -{ - return bio_integrity_alloc_bioset(bio, gfp_mask, nr_vecs, fs_bio_set); -} EXPORT_SYMBOL(bio_integrity_alloc); /** * bio_integrity_free - Free bio integrity payload * @bio: bio containing bip to be freed - * @bs: bio_set this bio was allocated from * * Description: Used to free the integrity portion of a bio. Usually * called from bio_free(). */ -void bio_integrity_free(struct bio *bio, struct bio_set *bs) +void bio_integrity_free(struct bio *bio) { struct bio_integrity_payload *bip = bio->bi_integrity; @@ -111,8 +92,8 @@ void bio_integrity_free(struct bio *bio, struct bio_set *bs) && bip->bip_buf != NULL) kfree(bip->bip_buf); - bvec_free_bs(bs, bip->bip_vec, bip->bip_pool); - mempool_free(bip, bs->bio_integrity_pool); + bvec_free_bs(integrity_bio_set, bip->bip_vec, bip->bip_pool); + mempool_free(bip, bio_integrity_pool); bio->bi_integrity = NULL; } @@ -686,19 +667,17 @@ EXPORT_SYMBOL(bio_integrity_split); * @bio: New bio * @bio_src: Original bio * @gfp_mask: Memory allocation mask - * @bs: bio_set to allocate bip from * * Description: Called to allocate a bip when cloning a bio */ -int bio_integrity_clone(struct bio *bio, struct bio *bio_src, - gfp_t gfp_mask, struct bio_set *bs) +int bio_integrity_clone(struct bio *bio, struct bio *bio_src, gfp_t gfp_mask) { struct bio_integrity_payload *bip_src = bio_src->bi_integrity; struct bio_integrity_payload *bip; BUG_ON(bip_src == NULL); - bip = bio_integrity_alloc_bioset(bio, gfp_mask, bip_src->bip_vcnt, bs); + bip = bio_integrity_alloc(bio, gfp_mask, bip_src->bip_vcnt); if (bip == NULL) return -EIO; @@ -714,37 +693,25 @@ int bio_integrity_clone(struct bio *bio, struct bio *bio_src, } EXPORT_SYMBOL(bio_integrity_clone); -int bioset_integrity_create(struct bio_set *bs, int pool_size) +static int __init bio_integrity_init(void) { - bs->bio_integrity_pool = mempool_create_slab_pool(pool_size, - bio_integrity_slab); - if (!bs->bio_integrity_pool) - return -1; - - return 0; -} -EXPORT_SYMBOL(bioset_integrity_create); + kintegrityd_wq = create_workqueue("kintegrityd"); -void bioset_integrity_free(struct bio_set *bs) -{ - if (bs->bio_integrity_pool) - mempool_destroy(bs->bio_integrity_pool); -} -EXPORT_SYMBOL(bioset_integrity_free); + if (!kintegrityd_wq) + panic("Failed to create kintegrityd\n"); -void __init bio_integrity_init_slab(void) -{ bio_integrity_slab = KMEM_CACHE(bio_integrity_payload, SLAB_HWCACHE_ALIGN|SLAB_PANIC); -} -static int __init integrity_init(void) -{ - kintegrityd_wq = create_workqueue("kintegrityd"); + bio_integrity_pool = mempool_create_slab_pool(BIO_POOL_SIZE, + bio_integrity_slab); + if (!bio_integrity_pool) + panic("bio_integrity: can't allocate bip pool\n"); - if (!kintegrityd_wq) - panic("Failed to create kintegrityd\n"); + integrity_bio_set = bioset_create(BIO_POOL_SIZE, 0); + if (!integrity_bio_set) + panic("bio_integrity: can't allocate bio_set\n"); return 0; } -subsys_initcall(integrity_init); +subsys_initcall(bio_integrity_init); diff --git a/fs/bio.c b/fs/bio.c index 9cc1430b4495..a040cde7f6fd 100644 --- a/fs/bio.c +++ b/fs/bio.c @@ -248,7 +248,7 @@ void bio_free(struct bio *bio, struct bio_set *bs) bvec_free_bs(bs, bio->bi_io_vec, BIO_POOL_IDX(bio)); if (bio_integrity(bio)) - bio_integrity_free(bio, bs); + bio_integrity_free(bio); /* * If we have front padding, adjust the bio pointer before freeing @@ -466,7 +466,7 @@ struct bio *bio_clone(struct bio *bio, gfp_t gfp_mask) if (bio_integrity(bio)) { int ret; - ret = bio_integrity_clone(b, bio, gfp_mask, fs_bio_set); + ret = bio_integrity_clone(b, bio, gfp_mask); if (ret < 0) { bio_put(b); @@ -1529,7 +1529,6 @@ void bioset_free(struct bio_set *bs) if (bs->bio_pool) mempool_destroy(bs->bio_pool); - bioset_integrity_free(bs); biovec_free_pools(bs); bio_put_slab(bs); @@ -1570,9 +1569,6 @@ struct bio_set *bioset_create(unsigned int pool_size, unsigned int front_pad) if (!bs->bio_pool) goto bad; - if (bioset_integrity_create(bs, pool_size)) - goto bad; - if (!biovec_create_pools(bs, pool_size)) return bs; @@ -1610,7 +1606,6 @@ static int __init init_bio(void) if (!bio_slabs) panic("bio: can't allocate bios\n"); - bio_integrity_init_slab(); biovec_init_slabs(); fs_bio_set = bioset_create(BIO_POOL_SIZE, 0); -- cgit v1.2.2 From 6933c02e9cc47c2df3c016621a013ec79fb4203f Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Tue, 17 Mar 2009 09:36:37 +0100 Subject: btrfs: get rid of current_is_pdflush() in btrfs_btree_balance_dirty Chris says it's safe to kill. Acked-by: Chris Mason Signed-off-by: Jens Axboe --- fs/btrfs/disk-io.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'fs') diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 3e18175248e0..6ec80c0fc869 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -2385,7 +2385,7 @@ void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr) unsigned long thresh = 32 * 1024 * 1024; tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree; - if (current_is_pdflush() || current->flags & PF_MEMALLOC) + if (current->flags & PF_MEMALLOC) return; num_dirty = count_range_bits(tree, &start, (u64)-1, -- cgit v1.2.2 From a2a9537ac0b37a5da6fbe7e1e9cb06c524d2a9c4 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Tue, 17 Mar 2009 09:38:40 +0100 Subject: Get rid of pdflush_operation() in emergency sync and remount Opencode a cheasy approach with kevent. The idea here is that we'll add some generic delayed work infrastructure, which probably wont be based on pdflush (or maybe it will, in which case we can just add it back). This is in preparation for getting rid of pdflush completely. Signed-off-by: Jens Axboe --- fs/super.c | 11 +++++++++-- fs/sync.c | 14 +++++++++++++- 2 files changed, 22 insertions(+), 3 deletions(-) (limited to 'fs') diff --git a/fs/super.c b/fs/super.c index 6ce501447ada..dd4acb158b5e 100644 --- a/fs/super.c +++ b/fs/super.c @@ -674,7 +674,7 @@ int do_remount_sb(struct super_block *sb, int flags, void *data, int force) return 0; } -static void do_emergency_remount(unsigned long foo) +static void do_emergency_remount(struct work_struct *work) { struct super_block *sb; @@ -697,12 +697,19 @@ static void do_emergency_remount(unsigned long foo) spin_lock(&sb_lock); } spin_unlock(&sb_lock); + kfree(work); printk("Emergency Remount complete\n"); } void emergency_remount(void) { - pdflush_operation(do_emergency_remount, 0); + struct work_struct *work; + + work = kmalloc(sizeof(*work), GFP_ATOMIC); + if (work) { + INIT_WORK(work, do_emergency_remount); + schedule_work(work); + } } /* diff --git a/fs/sync.c b/fs/sync.c index a16d53e5fe9d..ec95a69d17aa 100644 --- a/fs/sync.c +++ b/fs/sync.c @@ -42,9 +42,21 @@ SYSCALL_DEFINE0(sync) return 0; } +static void do_sync_work(struct work_struct *work) +{ + do_sync(0); + kfree(work); +} + void emergency_sync(void) { - pdflush_operation(do_sync, 0); + struct work_struct *work; + + work = kmalloc(sizeof(*work), GFP_ATOMIC); + if (work) { + INIT_WORK(work, do_sync_work); + schedule_work(work); + } } /* -- cgit v1.2.2