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提交 e942f883 编写于 作者: C Chris Mason
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Merge branch 'raid56-experimental' into for-linus-3.9 

Signed-off-by: NChris Mason <chris.mason@fusionio.com>

Conflicts:
	fs/btrfs/ctree.h
	fs/btrfs/extent-tree.c
	fs/btrfs/inode.c
	fs/btrfs/volumes.c
上级 b2c6b3e0 0e4e0263
隐藏空白更改
内联 并排
Showing with 2814 addition and 120 deletion
fs/btrfs/Kconfig
浏览文件 @ e942f883
......@@ -6,6 +6,9 @@ config BTRFS_FS
select ZLIB_DEFLATE
select LZO_COMPRESS
select LZO_DECOMPRESS
select RAID6_PQ
select XOR_BLOCKS
help
Btrfs is a new filesystem with extents, writable snapshotting,
support for multiple devices and many more features.
......
fs/btrfs/Makefile
浏览文件 @ e942f883
......@@ -8,7 +8,7 @@ btrfs-y += super.o ctree.o extent-tree.o print-tree.o root-tree.o dir-item.o \
extent_io.o volumes.o async-thread.o ioctl.o locking.o orphan.o \
export.o tree-log.o free-space-cache.o zlib.o lzo.o \
compression.o delayed-ref.o relocation.o delayed-inode.o scrub.o \
reada.o backref.o ulist.o qgroup.o send.o dev-replace.o
reada.o backref.o ulist.o qgroup.o send.o dev-replace.o raid56.o
btrfs-$(CONFIG_BTRFS_FS_POSIX_ACL) += acl.o
btrfs-$(CONFIG_BTRFS_FS_CHECK_INTEGRITY) += check-integrity.o
fs/btrfs/compression.c
浏览文件 @ e942f883
......@@ -372,7 +372,7 @@ int btrfs_submit_compressed_write(struct inode *inode, u64 start,
page = compressed_pages[pg_index];
page->mapping = inode->i_mapping;
if (bio->bi_size)
ret = io_tree->ops->merge_bio_hook(page, 0,
ret = io_tree->ops->merge_bio_hook(WRITE, page, 0,
PAGE_CACHE_SIZE,
bio, 0);
else
......@@ -655,7 +655,7 @@ int btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
page->index = em_start >> PAGE_CACHE_SHIFT;
if (comp_bio->bi_size)
ret = tree->ops->merge_bio_hook(page, 0,
ret = tree->ops->merge_bio_hook(READ, page, 0,
PAGE_CACHE_SIZE,
comp_bio, 0);
else
......
fs/btrfs/ctree.h
浏览文件 @ e942f883
......@@ -506,6 +506,7 @@ struct btrfs_super_block {
#define BTRFS_FEATURE_INCOMPAT_BIG_METADATA (1ULL << 5)
#define BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF (1ULL << 6)
#define BTRFS_FEATURE_INCOMPAT_RAID56 (1ULL << 7)
#define BTRFS_FEATURE_COMPAT_SUPP 0ULL
#define BTRFS_FEATURE_COMPAT_RO_SUPP 0ULL
......@@ -515,6 +516,7 @@ struct btrfs_super_block {
BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS | \
BTRFS_FEATURE_INCOMPAT_BIG_METADATA | \
BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO | \
BTRFS_FEATURE_INCOMPAT_RAID56 | \
BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)
/*
......@@ -956,6 +958,8 @@ struct btrfs_dev_replace_item {
#define BTRFS_BLOCK_GROUP_RAID1 (1ULL << 4)
#define BTRFS_BLOCK_GROUP_DUP (1ULL << 5)
#define BTRFS_BLOCK_GROUP_RAID10 (1ULL << 6)
#define BTRFS_BLOCK_GROUP_RAID5 (1 << 7)
#define BTRFS_BLOCK_GROUP_RAID6 (1 << 8)
#define BTRFS_BLOCK_GROUP_RESERVED BTRFS_AVAIL_ALLOC_BIT_SINGLE
enum btrfs_raid_types {
......@@ -964,6 +968,8 @@ enum btrfs_raid_types {
BTRFS_RAID_DUP,
BTRFS_RAID_RAID0,
BTRFS_RAID_SINGLE,
BTRFS_RAID_RAID5,
BTRFS_RAID_RAID6,
BTRFS_NR_RAID_TYPES
};
......@@ -973,6 +979,8 @@ enum btrfs_raid_types {
#define BTRFS_BLOCK_GROUP_PROFILE_MASK (BTRFS_BLOCK_GROUP_RAID0 | \
BTRFS_BLOCK_GROUP_RAID1 | \
BTRFS_BLOCK_GROUP_RAID5 | \
BTRFS_BLOCK_GROUP_RAID6 | \
BTRFS_BLOCK_GROUP_DUP | \
BTRFS_BLOCK_GROUP_RAID10)
/*
......@@ -1197,6 +1205,10 @@ struct btrfs_block_group_cache {
u64 flags;
u64 sectorsize;
u64 cache_generation;
/* for raid56, this is a full stripe, without parity */
unsigned long full_stripe_len;
unsigned int ro:1;
unsigned int dirty:1;
unsigned int iref:1;
......@@ -1242,6 +1254,23 @@ enum btrfs_orphan_cleanup_state {
ORPHAN_CLEANUP_DONE = 2,
};
/* used by the raid56 code to lock stripes for read/modify/write */
struct btrfs_stripe_hash {
struct list_head hash_list;
wait_queue_head_t wait;
spinlock_t lock;
};
/* used by the raid56 code to lock stripes for read/modify/write */
struct btrfs_stripe_hash_table {
struct list_head stripe_cache;
spinlock_t cache_lock;
int cache_size;
struct btrfs_stripe_hash table[];
};
#define BTRFS_STRIPE_HASH_TABLE_BITS 11
/* fs_info */
struct reloc_control;
struct btrfs_device;
......@@ -1341,6 +1370,13 @@ struct btrfs_fs_info {
struct mutex cleaner_mutex;
struct mutex chunk_mutex;
struct mutex volume_mutex;
/* this is used during read/modify/write to make sure
* no two ios are trying to mod the same stripe at the same
* time
*/
struct btrfs_stripe_hash_table *stripe_hash_table;
/*
* this protects the ordered operations list only while we are
* processing all of the entries on it. This way we make
......@@ -1423,6 +1459,8 @@ struct btrfs_fs_info {
struct btrfs_workers flush_workers;
struct btrfs_workers endio_workers;
struct btrfs_workers endio_meta_workers;
struct btrfs_workers endio_raid56_workers;
struct btrfs_workers rmw_workers;
struct btrfs_workers endio_meta_write_workers;
struct btrfs_workers endio_write_workers;
struct btrfs_workers endio_freespace_worker;
......@@ -3490,9 +3528,9 @@ int btrfs_writepages(struct address_space *mapping,
struct writeback_control *wbc);
int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
struct btrfs_root *new_root, u64 new_dirid);
int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
size_t size, struct bio *bio, unsigned long bio_flags);
int btrfs_merge_bio_hook(int rw, struct page *page, unsigned long offset,
size_t size, struct bio *bio,
unsigned long bio_flags);
int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
int btrfs_readpage(struct file *file, struct page *page);
void btrfs_evict_inode(struct inode *inode);
......
fs/btrfs/delayed-ref.h
浏览文件 @ e942f883
......@@ -131,6 +131,15 @@ struct btrfs_delayed_ref_root {
/* total number of head nodes ready for processing */
unsigned long num_heads_ready;
/*
* bumped when someone is making progress on the delayed
* refs, so that other procs know they are just adding to
* contention intead of helping
*/
atomic_t procs_running_refs;
atomic_t ref_seq;
wait_queue_head_t wait;
/*
* set when the tree is flushing before a transaction commit,
* used by the throttling code to decide if new updates need
......
fs/btrfs/disk-io.c
浏览文件 @ e942f883
......@@ -46,6 +46,7 @@
#include "check-integrity.h"
#include "rcu-string.h"
#include "dev-replace.h"
#include "raid56.h"
#ifdef CONFIG_X86
#include <asm/cpufeature.h>
......@@ -640,8 +641,15 @@ static int btree_readpage_end_io_hook(struct page *page, u64 start, u64 end,
btree_readahead_hook(root, eb, eb->start, ret);
}
if (ret)
if (ret) {
/*
* our io error hook is going to dec the io pages
* again, we have to make sure it has something
* to decrement
*/
atomic_inc(&eb->io_pages);
clear_extent_buffer_uptodate(eb);
}
free_extent_buffer(eb);
out:
return ret;
......@@ -655,6 +663,7 @@ static int btree_io_failed_hook(struct page *page, int failed_mirror)
eb = (struct extent_buffer *)page->private;
set_bit(EXTENT_BUFFER_IOERR, &eb->bflags);
eb->read_mirror = failed_mirror;
atomic_dec(&eb->io_pages);
if (test_and_clear_bit(EXTENT_BUFFER_READAHEAD, &eb->bflags))
btree_readahead_hook(root, eb, eb->start, -EIO);
return -EIO; /* we fixed nothing */
......@@ -671,17 +680,23 @@ static void end_workqueue_bio(struct bio *bio, int err)
end_io_wq->work.flags = 0;
if (bio->bi_rw & REQ_WRITE) {
if (end_io_wq->metadata == 1)
if (end_io_wq->metadata == BTRFS_WQ_ENDIO_METADATA)
btrfs_queue_worker(&fs_info->endio_meta_write_workers,
&end_io_wq->work);
else if (end_io_wq->metadata == 2)
else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_FREE_SPACE)
btrfs_queue_worker(&fs_info->endio_freespace_worker,
&end_io_wq->work);
else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_RAID56)
btrfs_queue_worker(&fs_info->endio_raid56_workers,
&end_io_wq->work);
else
btrfs_queue_worker(&fs_info->endio_write_workers,
&end_io_wq->work);
} else {
if (end_io_wq->metadata)
if (end_io_wq->metadata == BTRFS_WQ_ENDIO_RAID56)
btrfs_queue_worker(&fs_info->endio_raid56_workers,
&end_io_wq->work);
else if (end_io_wq->metadata)
btrfs_queue_worker(&fs_info->endio_meta_workers,
&end_io_wq->work);
else
......@@ -696,6 +711,7 @@ static void end_workqueue_bio(struct bio *bio, int err)
* 0 - if data
* 1 - if normal metadta
* 2 - if writing to the free space cache area
* 3 - raid parity work
*/
int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
int metadata)
......@@ -2179,6 +2195,12 @@ int open_ctree(struct super_block *sb,
init_waitqueue_head(&fs_info->transaction_blocked_wait);
init_waitqueue_head(&fs_info->async_submit_wait);
ret = btrfs_alloc_stripe_hash_table(fs_info);
if (ret) {
err = -ENOMEM;
goto fail_alloc;
}
__setup_root(4096, 4096, 4096, 4096, tree_root,
fs_info, BTRFS_ROOT_TREE_OBJECTID);
......@@ -2349,6 +2371,12 @@ int open_ctree(struct super_block *sb,
btrfs_init_workers(&fs_info->endio_meta_write_workers,
"endio-meta-write", fs_info->thread_pool_size,
&fs_info->generic_worker);
btrfs_init_workers(&fs_info->endio_raid56_workers,
"endio-raid56", fs_info->thread_pool_size,
&fs_info->generic_worker);
btrfs_init_workers(&fs_info->rmw_workers,
"rmw", fs_info->thread_pool_size,
&fs_info->generic_worker);
btrfs_init_workers(&fs_info->endio_write_workers, "endio-write",
fs_info->thread_pool_size,
&fs_info->generic_worker);
......@@ -2367,6 +2395,8 @@ int open_ctree(struct super_block *sb,
*/
fs_info->endio_workers.idle_thresh = 4;
fs_info->endio_meta_workers.idle_thresh = 4;
fs_info->endio_raid56_workers.idle_thresh = 4;
fs_info->rmw_workers.idle_thresh = 2;
fs_info->endio_write_workers.idle_thresh = 2;
fs_info->endio_meta_write_workers.idle_thresh = 2;
......@@ -2383,6 +2413,8 @@ int open_ctree(struct super_block *sb,
ret |= btrfs_start_workers(&fs_info->fixup_workers);
ret |= btrfs_start_workers(&fs_info->endio_workers);
ret |= btrfs_start_workers(&fs_info->endio_meta_workers);
ret |= btrfs_start_workers(&fs_info->rmw_workers);
ret |= btrfs_start_workers(&fs_info->endio_raid56_workers);
ret |= btrfs_start_workers(&fs_info->endio_meta_write_workers);
ret |= btrfs_start_workers(&fs_info->endio_write_workers);
ret |= btrfs_start_workers(&fs_info->endio_freespace_worker);
......@@ -2726,6 +2758,8 @@ int open_ctree(struct super_block *sb,
btrfs_stop_workers(&fs_info->workers);
btrfs_stop_workers(&fs_info->endio_workers);
btrfs_stop_workers(&fs_info->endio_meta_workers);
btrfs_stop_workers(&fs_info->endio_raid56_workers);
btrfs_stop_workers(&fs_info->rmw_workers);
btrfs_stop_workers(&fs_info->endio_meta_write_workers);
btrfs_stop_workers(&fs_info->endio_write_workers);
btrfs_stop_workers(&fs_info->endio_freespace_worker);
......@@ -2747,6 +2781,7 @@ int open_ctree(struct super_block *sb,
fail_srcu:
cleanup_srcu_struct(&fs_info->subvol_srcu);
fail:
btrfs_free_stripe_hash_table(fs_info);
btrfs_close_devices(fs_info->fs_devices);
return err;
......@@ -3094,11 +3129,16 @@ int btrfs_calc_num_tolerated_disk_barrier_failures(
((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK)
== 0)))
num_tolerated_disk_barrier_failures = 0;
else if (num_tolerated_disk_barrier_failures > 1
&&
(flags & (BTRFS_BLOCK_GROUP_RAID1 |
BTRFS_BLOCK_GROUP_RAID10)))
num_tolerated_disk_barrier_failures = 1;
else if (num_tolerated_disk_barrier_failures > 1) {
if (flags & (BTRFS_BLOCK_GROUP_RAID1 |
BTRFS_BLOCK_GROUP_RAID5 |
BTRFS_BLOCK_GROUP_RAID10)) {
num_tolerated_disk_barrier_failures = 1;
} else if (flags &
BTRFS_BLOCK_GROUP_RAID5) {
num_tolerated_disk_barrier_failures = 2;
}
}
}
}
up_read(&sinfo->groups_sem);
......@@ -3402,6 +3442,8 @@ int close_ctree(struct btrfs_root *root)
btrfs_stop_workers(&fs_info->workers);
btrfs_stop_workers(&fs_info->endio_workers);
btrfs_stop_workers(&fs_info->endio_meta_workers);
btrfs_stop_workers(&fs_info->endio_raid56_workers);
btrfs_stop_workers(&fs_info->rmw_workers);
btrfs_stop_workers(&fs_info->endio_meta_write_workers);
btrfs_stop_workers(&fs_info->endio_write_workers);
btrfs_stop_workers(&fs_info->endio_freespace_worker);
......@@ -3424,6 +3466,8 @@ int close_ctree(struct btrfs_root *root)
bdi_destroy(&fs_info->bdi);
cleanup_srcu_struct(&fs_info->subvol_srcu);
btrfs_free_stripe_hash_table(fs_info);
return 0;
}
......
fs/btrfs/disk-io.h
浏览文件 @ e942f883
......@@ -25,6 +25,13 @@
#define BTRFS_SUPER_MIRROR_MAX 3
#define BTRFS_SUPER_MIRROR_SHIFT 12
enum {
BTRFS_WQ_ENDIO_DATA = 0,
BTRFS_WQ_ENDIO_METADATA = 1,
BTRFS_WQ_ENDIO_FREE_SPACE = 2,
BTRFS_WQ_ENDIO_RAID56 = 3,
};
static inline u64 btrfs_sb_offset(int mirror)
{
u64 start = 16 * 1024;
......
fs/btrfs/extent-tree.c
浏览文件 @ e942f883
......@@ -31,6 +31,7 @@
#include "print-tree.h"
#include "transaction.h"
#include "volumes.h"
#include "raid56.h"
#include "locking.h"
#include "free-space-cache.h"
#include "math.h"
......@@ -1852,6 +1853,8 @@ static int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr,
*actual_bytes = discarded_bytes;
if (ret == -EOPNOTSUPP)
ret = 0;
return ret;
}
......@@ -2440,6 +2443,16 @@ int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans,
return ret;
}
static int refs_newer(struct btrfs_delayed_ref_root *delayed_refs, int seq,
int count)
{
int val = atomic_read(&delayed_refs->ref_seq);
if (val < seq || val >= seq + count)
return 1;
return 0;
}
/*
* this starts processing the delayed reference count updates and
* extent insertions we have queued up so far. count can be
......@@ -2474,6 +2487,44 @@ int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
delayed_refs = &trans->transaction->delayed_refs;
INIT_LIST_HEAD(&cluster);
if (count == 0) {
count = delayed_refs->num_entries * 2;
run_most = 1;
}
if (!run_all && !run_most) {
int old;
int seq = atomic_read(&delayed_refs->ref_seq);
progress:
old = atomic_cmpxchg(&delayed_refs->procs_running_refs, 0, 1);
if (old) {
DEFINE_WAIT(__wait);
if (delayed_refs->num_entries < 16348)
return 0;
prepare_to_wait(&delayed_refs->wait, &__wait,
TASK_UNINTERRUPTIBLE);
old = atomic_cmpxchg(&delayed_refs->procs_running_refs, 0, 1);
if (old) {
schedule();
finish_wait(&delayed_refs->wait, &__wait);
if (!refs_newer(delayed_refs, seq, 256))
goto progress;
else
return 0;
} else {
finish_wait(&delayed_refs->wait, &__wait);
goto again;
}
}
} else {
atomic_inc(&delayed_refs->procs_running_refs);
}
again:
loops = 0;
spin_lock(&delayed_refs->lock);
......@@ -2482,10 +2533,6 @@ int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
delayed_refs->run_delayed_start = find_middle(&delayed_refs->root);
#endif
if (count == 0) {
count = delayed_refs->num_entries * 2;
run_most = 1;
}
while (1) {
if (!(run_all || run_most) &&
delayed_refs->num_heads_ready < 64)
......@@ -2508,9 +2555,12 @@ int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
btrfs_release_ref_cluster(&cluster);
spin_unlock(&delayed_refs->lock);
btrfs_abort_transaction(trans, root, ret);
atomic_dec(&delayed_refs->procs_running_refs);
return ret;
}
atomic_add(ret, &delayed_refs->ref_seq);
count -= min_t(unsigned long, ret, count);
if (count == 0)
......@@ -2579,6 +2629,11 @@ int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
goto again;
}
out:
atomic_dec(&delayed_refs->procs_running_refs);
smp_mb();
if (waitqueue_active(&delayed_refs->wait))
wake_up(&delayed_refs->wait);
spin_unlock(&delayed_refs->lock);
assert_qgroups_uptodate(trans);
return 0;
......@@ -3284,6 +3339,7 @@ u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags)
u64 num_devices = root->fs_info->fs_devices->rw_devices +
root->fs_info->fs_devices->missing_devices;
u64 target;
u64 tmp;
/*
* see if restripe for this chunk_type is in progress, if so
......@@ -3300,30 +3356,32 @@ u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags)
}
spin_unlock(&root->fs_info->balance_lock);
/* First, mask out the RAID levels which aren't possible */
if (num_devices == 1)
flags &= ~(BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID0);
flags &= ~(BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID0 |
BTRFS_BLOCK_GROUP_RAID5);
if (num_devices < 3)
flags &= ~BTRFS_BLOCK_GROUP_RAID6;
if (num_devices < 4)
flags &= ~BTRFS_BLOCK_GROUP_RAID10;
if ((flags & BTRFS_BLOCK_GROUP_DUP) &&
(flags & (BTRFS_BLOCK_GROUP_RAID1 |
BTRFS_BLOCK_GROUP_RAID10))) {
flags &= ~BTRFS_BLOCK_GROUP_DUP;
}
tmp = flags & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID0 |
BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID5 |
BTRFS_BLOCK_GROUP_RAID6 | BTRFS_BLOCK_GROUP_RAID10);
flags &= ~tmp;
if ((flags & BTRFS_BLOCK_GROUP_RAID1) &&
(flags & BTRFS_BLOCK_GROUP_RAID10)) {
flags &= ~BTRFS_BLOCK_GROUP_RAID1;
}
if ((flags & BTRFS_BLOCK_GROUP_RAID0) &&
((flags & BTRFS_BLOCK_GROUP_RAID1) |
(flags & BTRFS_BLOCK_GROUP_RAID10) |
(flags & BTRFS_BLOCK_GROUP_DUP))) {
flags &= ~BTRFS_BLOCK_GROUP_RAID0;
}
if (tmp & BTRFS_BLOCK_GROUP_RAID6)
tmp = BTRFS_BLOCK_GROUP_RAID6;
else if (tmp & BTRFS_BLOCK_GROUP_RAID5)
tmp = BTRFS_BLOCK_GROUP_RAID5;
else if (tmp & BTRFS_BLOCK_GROUP_RAID10)
tmp = BTRFS_BLOCK_GROUP_RAID10;
else if (tmp & BTRFS_BLOCK_GROUP_RAID1)
tmp = BTRFS_BLOCK_GROUP_RAID1;
else if (tmp & BTRFS_BLOCK_GROUP_RAID0)
tmp = BTRFS_BLOCK_GROUP_RAID0;
return extended_to_chunk(flags);
return extended_to_chunk(flags | tmp);
}
static u64 get_alloc_profile(struct btrfs_root *root, u64 flags)
......@@ -3347,6 +3405,7 @@ static u64 get_alloc_profile(struct btrfs_root *root, u64 flags)
u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data)
{
u64 flags;
u64 ret;
if (data)
flags = BTRFS_BLOCK_GROUP_DATA;
......@@ -3355,7 +3414,8 @@ u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data)
else
flags = BTRFS_BLOCK_GROUP_METADATA;
return get_alloc_profile(root, flags);
ret = get_alloc_profile(root, flags);
return ret;
}
/*
......@@ -3530,8 +3590,10 @@ static u64 get_system_chunk_thresh(struct btrfs_root *root, u64 type)
{
u64 num_dev;
if (type & BTRFS_BLOCK_GROUP_RAID10 ||
type & BTRFS_BLOCK_GROUP_RAID0)
if (type & (BTRFS_BLOCK_GROUP_RAID10 |
BTRFS_BLOCK_GROUP_RAID0 |
BTRFS_BLOCK_GROUP_RAID5 |
BTRFS_BLOCK_GROUP_RAID6))
num_dev = root->fs_info->fs_devices->rw_devices;
else if (type & BTRFS_BLOCK_GROUP_RAID1)
num_dev = 2;
......@@ -3706,7 +3768,9 @@ static int can_overcommit(struct btrfs_root *root,
/*
* If we have dup, raid1 or raid10 then only half of the free
* space is actually useable.
* space is actually useable. For raid56, the space info used
* doesn't include the parity drive, so we don't have to
* change the math
*/
if (profile & (BTRFS_BLOCK_GROUP_DUP |
BTRFS_BLOCK_GROUP_RAID1 |
......@@ -5539,10 +5603,14 @@ int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root *root,
return ret;
}
static u64 stripe_align(struct btrfs_root *root, u64 val)
static u64 stripe_align(struct btrfs_root *root,
struct btrfs_block_group_cache *cache,
u64 val, u64 num_bytes)
{
u64 mask = ((u64)root->stripesize - 1);
u64 ret = (val + mask) & ~mask;
u64 mask;
u64 ret;
mask = ((u64)root->stripesize - 1);
ret = (val + mask) & ~mask;
return ret;
}
......@@ -5599,8 +5667,12 @@ int __get_raid_index(u64 flags)
return BTRFS_RAID_DUP;
else if (flags & BTRFS_BLOCK_GROUP_RAID0)
return BTRFS_RAID_RAID0;
else
return BTRFS_RAID_SINGLE;
else if (flags & BTRFS_BLOCK_GROUP_RAID5)
return BTRFS_RAID_RAID5;
else if (flags & BTRFS_BLOCK_GROUP_RAID6)
return BTRFS_RAID_RAID6;
return BTRFS_RAID_SINGLE; /* BTRFS_BLOCK_GROUP_SINGLE */
}
static int get_block_group_index(struct btrfs_block_group_cache *cache)
......@@ -5743,6 +5815,8 @@ static noinline int find_free_extent(struct btrfs_trans_handle *trans,
if (!block_group_bits(block_group, data)) {
u64 extra = BTRFS_BLOCK_GROUP_DUP |
BTRFS_BLOCK_GROUP_RAID1 |
BTRFS_BLOCK_GROUP_RAID5 |
BTRFS_BLOCK_GROUP_RAID6 |
BTRFS_BLOCK_GROUP_RAID10;
/*
......@@ -5771,6 +5845,7 @@ static noinline int find_free_extent(struct btrfs_trans_handle *trans,
* lets look there
*/
if (last_ptr) {
unsigned long aligned_cluster;
/*
* the refill lock keeps out other
* people trying to start a new cluster
......@@ -5837,11 +5912,15 @@ static noinline int find_free_extent(struct btrfs_trans_handle *trans,
goto unclustered_alloc;
}
aligned_cluster = max_t(unsigned long,
empty_cluster + empty_size,
block_group->full_stripe_len);
/* allocate a cluster in this block group */
ret = btrfs_find_space_cluster(trans, root,
block_group, last_ptr,
search_start, num_bytes,
empty_cluster + empty_size);
aligned_cluster);
if (ret == 0) {
/*
* now pull our allocation out of this
......@@ -5912,7 +5991,8 @@ static noinline int find_free_extent(struct btrfs_trans_handle *trans,
goto loop;
}
checks:
search_start = stripe_align(root, offset);
search_start = stripe_align(root, used_block_group,
offset, num_bytes);
/* move on to the next group */
if (search_start + num_bytes >
......@@ -7284,6 +7364,7 @@ static u64 update_block_group_flags(struct btrfs_root *root, u64 flags)
root->fs_info->fs_devices->missing_devices;
stripped = BTRFS_BLOCK_GROUP_RAID0 |
BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6 |
BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10;
if (num_devices == 1) {
......@@ -7837,7 +7918,9 @@ int btrfs_read_block_groups(struct btrfs_root *root)
btrfs_release_path(path);
cache->flags = btrfs_block_group_flags(&cache->item);
cache->sectorsize = root->sectorsize;
cache->full_stripe_len = btrfs_full_stripe_len(root,
&root->fs_info->mapping_tree,
found_key.objectid);
btrfs_init_free_space_ctl(cache);
/*
......@@ -7891,6 +7974,8 @@ int btrfs_read_block_groups(struct btrfs_root *root)
if (!(get_alloc_profile(root, space_info->flags) &
(BTRFS_BLOCK_GROUP_RAID10 |
BTRFS_BLOCK_GROUP_RAID1 |
BTRFS_BLOCK_GROUP_RAID5 |
BTRFS_BLOCK_GROUP_RAID6 |
BTRFS_BLOCK_GROUP_DUP)))
continue;
/*
......@@ -7966,6 +8051,9 @@ int btrfs_make_block_group(struct btrfs_trans_handle *trans,
cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY;
cache->sectorsize = root->sectorsize;
cache->fs_info = root->fs_info;
cache->full_stripe_len = btrfs_full_stripe_len(root,
&root->fs_info->mapping_tree,
chunk_offset);
atomic_set(&cache->count, 1);
spin_lock_init(&cache->lock);
......
fs/btrfs/extent_io.c
浏览文件 @ e942f883
......@@ -1895,13 +1895,11 @@ static int free_io_failure(struct inode *inode, struct io_failure_record *rec,
if (ret)
err = ret;
if (did_repair) {
ret = clear_extent_bits(&BTRFS_I(inode)->io_tree, rec->start,
rec->start + rec->len - 1,
EXTENT_DAMAGED, GFP_NOFS);
if (ret && !err)
err = ret;
}
ret = clear_extent_bits(&BTRFS_I(inode)->io_tree, rec->start,
rec->start + rec->len - 1,
EXTENT_DAMAGED, GFP_NOFS);
if (ret && !err)
err = ret;
kfree(rec);
return err;
......@@ -1932,10 +1930,15 @@ int repair_io_failure(struct btrfs_fs_info *fs_info, u64 start,
u64 map_length = 0;
u64 sector;
struct btrfs_bio *bbio = NULL;
struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree;
int ret;
BUG_ON(!mirror_num);
/* we can't repair anything in raid56 yet */
if (btrfs_is_parity_mirror(map_tree, logical, length, mirror_num))
return 0;
bio = bio_alloc(GFP_NOFS, 1);
if (!bio)
return -EIO;
......@@ -2052,6 +2055,7 @@ static int clean_io_failure(u64 start, struct page *page)
failrec->failed_mirror);
did_repair = !ret;
}
ret = 0;
}
out:
......@@ -2487,13 +2491,13 @@ static int __must_check submit_one_bio(int rw, struct bio *bio,
return ret;
}
static int merge_bio(struct extent_io_tree *tree, struct page *page,
static int merge_bio(int rw, struct extent_io_tree *tree, struct page *page,
unsigned long offset, size_t size, struct bio *bio,
unsigned long bio_flags)
{
int ret = 0;
if (tree->ops && tree->ops->merge_bio_hook)
ret = tree->ops->merge_bio_hook(page, offset, size, bio,
ret = tree->ops->merge_bio_hook(rw, page, offset, size, bio,
bio_flags);
BUG_ON(ret < 0);
return ret;
......@@ -2528,7 +2532,7 @@ static int submit_extent_page(int rw, struct extent_io_tree *tree,
sector;
if (prev_bio_flags != bio_flags || !contig ||
merge_bio(tree, page, offset, page_size, bio, bio_flags) ||
merge_bio(rw, tree, page, offset, page_size, bio, bio_flags) ||
bio_add_page(bio, page, page_size, offset) < page_size) {
ret = submit_one_bio(rw, bio, mirror_num,
prev_bio_flags);
......@@ -4162,6 +4166,7 @@ static inline void btrfs_release_extent_buffer(struct extent_buffer *eb)
static void check_buffer_tree_ref(struct extent_buffer *eb)
{
int refs;
/* the ref bit is tricky. We have to make sure it is set
* if we have the buffer dirty. Otherwise the
* code to free a buffer can end up dropping a dirty
......@@ -4182,6 +4187,10 @@ static void check_buffer_tree_ref(struct extent_buffer *eb)
* So bump the ref count first, then set the bit. If someone
* beat us to it, drop the ref we added.
*/
refs = atomic_read(&eb->refs);
if (refs >= 2 && test_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags))
return;
spin_lock(&eb->refs_lock);
if (!test_and_set_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags))
atomic_inc(&eb->refs);
......@@ -4383,9 +4392,20 @@ static int release_extent_buffer(struct extent_buffer *eb, gfp_t mask)
void free_extent_buffer(struct extent_buffer *eb)
{
int refs;
int old;
if (!eb)
return;
while (1) {
refs = atomic_read(&eb->refs);
if (refs <= 3)
break;
old = atomic_cmpxchg(&eb->refs, refs, refs - 1);
if (old == refs)
return;
}
spin_lock(&eb->refs_lock);
if (atomic_read(&eb->refs) == 2 &&
test_bit(EXTENT_BUFFER_DUMMY, &eb->bflags))
......
fs/btrfs/extent_io.h
浏览文件 @ e942f883
......@@ -72,7 +72,7 @@ struct extent_io_ops {
int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
extent_submit_bio_hook_t *submit_bio_hook;
int (*merge_bio_hook)(struct page *page, unsigned long offset,
int (*merge_bio_hook)(int rw, struct page *page, unsigned long offset,
size_t size, struct bio *bio,
unsigned long bio_flags);
int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
......
fs/btrfs/free-space-cache.c
浏览文件 @ e942f883
......@@ -1465,10 +1465,14 @@ static int search_bitmap(struct btrfs_free_space_ctl *ctl,
}
static struct btrfs_free_space *
find_free_space(struct btrfs_free_space_ctl *ctl, u64 *offset, u64 *bytes)
find_free_space(struct btrfs_free_space_ctl *ctl, u64 *offset, u64 *bytes,
unsigned long align)
{
struct btrfs_free_space *entry;
struct rb_node *node;
u64 ctl_off;
u64 tmp;
u64 align_off;
int ret;
if (!ctl->free_space_offset.rb_node)
......@@ -1483,15 +1487,34 @@ find_free_space(struct btrfs_free_space_ctl *ctl, u64 *offset, u64 *bytes)
if (entry->bytes < *bytes)
continue;
/* make sure the space returned is big enough
* to match our requested alignment
*/
if (*bytes >= align) {
ctl_off = entry->offset - ctl->start;
tmp = ctl_off + align - 1;;
do_div(tmp, align);
tmp = tmp * align + ctl->start;
align_off = tmp - entry->offset;
} else {
align_off = 0;
tmp = entry->offset;
}
if (entry->bytes < *bytes + align_off)
continue;
if (entry->bitmap) {
ret = search_bitmap(ctl, entry, offset, bytes);
if (!ret)
ret = search_bitmap(ctl, entry, &tmp, bytes);
if (!ret) {
*offset = tmp;
return entry;
}
continue;
}
*offset = entry->offset;
*bytes = entry->bytes;
*offset = tmp;
*bytes = entry->bytes - align_off;
return entry;
}
......@@ -2101,9 +2124,12 @@ u64 btrfs_find_space_for_alloc(struct btrfs_block_group_cache *block_group,
struct btrfs_free_space *entry = NULL;
u64 bytes_search = bytes + empty_size;
u64 ret = 0;
u64 align_gap = 0;
u64 align_gap_len = 0;
spin_lock(&ctl->tree_lock);
entry = find_free_space(ctl, &offset, &bytes_search);
entry = find_free_space(ctl, &offset, &bytes_search,
block_group->full_stripe_len);
if (!entry)
goto out;
......@@ -2113,9 +2139,15 @@ u64 btrfs_find_space_for_alloc(struct btrfs_block_group_cache *block_group,
if (!entry->bytes)
free_bitmap(ctl, entry);
} else {
unlink_free_space(ctl, entry);
entry->offset += bytes;
entry->bytes -= bytes;
align_gap_len = offset - entry->offset;
align_gap = entry->offset;
entry->offset = offset + bytes;
WARN_ON(entry->bytes < bytes + align_gap_len);
entry->bytes -= bytes + align_gap_len;
if (!entry->bytes)
kmem_cache_free(btrfs_free_space_cachep, entry);
else
......@@ -2125,6 +2157,8 @@ u64 btrfs_find_space_for_alloc(struct btrfs_block_group_cache *block_group,
out:
spin_unlock(&ctl->tree_lock);
if (align_gap_len)
__btrfs_add_free_space(ctl, align_gap, align_gap_len);
return ret;
}
......
fs/btrfs/inode.c
浏览文件 @ e942f883
......@@ -40,6 +40,7 @@
#include <linux/ratelimit.h>
#include <linux/mount.h>
#include <linux/btrfs.h>
#include <linux/blkdev.h>
#include "compat.h"
#include "ctree.h"
#include "disk-io.h"
......@@ -1605,7 +1606,7 @@ static void btrfs_clear_bit_hook(struct inode *inode,
* extent_io.c merge_bio_hook, this must check the chunk tree to make sure
* we don't create bios that span stripes or chunks
*/
int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
int btrfs_merge_bio_hook(int rw, struct page *page, unsigned long offset,
size_t size, struct bio *bio,
unsigned long bio_flags)
{
......@@ -1620,7 +1621,7 @@ int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
length = bio->bi_size;
map_length = length;
ret = btrfs_map_block(root->fs_info, READ, logical,
ret = btrfs_map_block(root->fs_info, rw, logical,
&map_length, NULL, 0);
/* Will always return 0 with map_multi == NULL */
BUG_ON(ret < 0);
......@@ -6464,19 +6465,24 @@ static int btrfs_submit_direct_hook(int rw, struct btrfs_dio_private *dip,
int async_submit = 0;
map_length = orig_bio->bi_size;
ret = btrfs_map_block(root->fs_info, READ, start_sector << 9,
ret = btrfs_map_block(root->fs_info, rw, start_sector << 9,
&map_length, NULL, 0);
if (ret) {
bio_put(orig_bio);
return -EIO;
}
if (map_length >= orig_bio->bi_size) {
bio = orig_bio;
goto submit;
}
async_submit = 1;
/* async crcs make it difficult to collect full stripe writes. */
if (btrfs_get_alloc_profile(root, 1) &
(BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6))
async_submit = 0;
else
async_submit = 1;
bio = btrfs_dio_bio_alloc(orig_bio->bi_bdev, start_sector, GFP_NOFS);
if (!bio)
return -ENOMEM;
......@@ -6518,7 +6524,7 @@ static int btrfs_submit_direct_hook(int rw, struct btrfs_dio_private *dip,
bio->bi_end_io = btrfs_end_dio_bio;
map_length = orig_bio->bi_size;
ret = btrfs_map_block(root->fs_info, READ,
ret = btrfs_map_block(root->fs_info, rw,
start_sector << 9,
&map_length, NULL, 0);
if (ret) {
......
fs/btrfs/raid56.c 0 → 100644
浏览文件 @ e942f883
/*
* Copyright (C) 2012 Fusion-io All rights reserved.
* Copyright (C) 2012 Intel Corp. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License v2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/bio.h>
#include <linux/slab.h>
#include <linux/buffer_head.h>
#include <linux/blkdev.h>
#include <linux/random.h>
#include <linux/iocontext.h>
#include <linux/capability.h>
#include <linux/ratelimit.h>
#include <linux/kthread.h>
#include <linux/raid/pq.h>
#include <linux/hash.h>
#include <linux/list_sort.h>
#include <linux/raid/xor.h>
#include <asm/div64.h>
#include "compat.h"
#include "ctree.h"
#include "extent_map.h"
#include "disk-io.h"
#include "transaction.h"
#include "print-tree.h"
#include "volumes.h"
#include "raid56.h"
#include "async-thread.h"
#include "check-integrity.h"
#include "rcu-string.h"
/* set when additional merges to this rbio are not allowed */
#define RBIO_RMW_LOCKED_BIT 1
/*
* set when this rbio is sitting in the hash, but it is just a cache
* of past RMW
*/
#define RBIO_CACHE_BIT 2
/*
* set when it is safe to trust the stripe_pages for caching
*/
#define RBIO_CACHE_READY_BIT 3
#define RBIO_CACHE_SIZE 1024
struct btrfs_raid_bio {
struct btrfs_fs_info *fs_info;
struct btrfs_bio *bbio;
/*
* logical block numbers for the start of each stripe
* The last one or two are p/q. These are sorted,
* so raid_map[0] is the start of our full stripe
*/
u64 *raid_map;
/* while we're doing rmw on a stripe
* we put it into a hash table so we can
* lock the stripe and merge more rbios
* into it.
*/
struct list_head hash_list;
/*
* LRU list for the stripe cache
*/
struct list_head stripe_cache;
/*
* for scheduling work in the helper threads
*/
struct btrfs_work work;
/*
* bio list and bio_list_lock are used
* to add more bios into the stripe
* in hopes of avoiding the full rmw
*/
struct bio_list bio_list;
spinlock_t bio_list_lock;
/* also protected by the bio_list_lock, the
* plug list is used by the plugging code
* to collect partial bios while plugged. The
* stripe locking code also uses it to hand off
* the stripe lock to the next pending IO
*/
struct list_head plug_list;
/*
* flags that tell us if it is safe to
* merge with this bio
*/
unsigned long flags;
/* size of each individual stripe on disk */
int stripe_len;
/* number of data stripes (no p/q) */
int nr_data;
/*
* set if we're doing a parity rebuild
* for a read from higher up, which is handled
* differently from a parity rebuild as part of
* rmw
*/
int read_rebuild;
/* first bad stripe */
int faila;
/* second bad stripe (for raid6 use) */
int failb;
/*
* number of pages needed to represent the full
* stripe
*/
int nr_pages;
/*
* size of all the bios in the bio_list. This
* helps us decide if the rbio maps to a full
* stripe or not
*/
int bio_list_bytes;
atomic_t refs;
/*
* these are two arrays of pointers. We allocate the
* rbio big enough to hold them both and setup their
* locations when the rbio is allocated
*/
/* pointers to pages that we allocated for
* reading/writing stripes directly from the disk (including P/Q)
*/
struct page **stripe_pages;
/*
* pointers to the pages in the bio_list. Stored
* here for faster lookup
*/
struct page **bio_pages;
};
static int __raid56_parity_recover(struct btrfs_raid_bio *rbio);
static noinline void finish_rmw(struct btrfs_raid_bio *rbio);
static void rmw_work(struct btrfs_work *work);
static void read_rebuild_work(struct btrfs_work *work);
static void async_rmw_stripe(struct btrfs_raid_bio *rbio);
static void async_read_rebuild(struct btrfs_raid_bio *rbio);
static int fail_bio_stripe(struct btrfs_raid_bio *rbio, struct bio *bio);
static int fail_rbio_index(struct btrfs_raid_bio *rbio, int failed);
static void __free_raid_bio(struct btrfs_raid_bio *rbio);
static void index_rbio_pages(struct btrfs_raid_bio *rbio);
static int alloc_rbio_pages(struct btrfs_raid_bio *rbio);
/*
* the stripe hash table is used for locking, and to collect
* bios in hopes of making a full stripe
*/
int btrfs_alloc_stripe_hash_table(struct btrfs_fs_info *info)
{
struct btrfs_stripe_hash_table *table;
struct btrfs_stripe_hash_table *x;
struct btrfs_stripe_hash *cur;
struct btrfs_stripe_hash *h;
int num_entries = 1 << BTRFS_STRIPE_HASH_TABLE_BITS;
int i;
if (info->stripe_hash_table)
return 0;
table = kzalloc(sizeof(*table) + sizeof(*h) * num_entries, GFP_NOFS);
if (!table)
return -ENOMEM;
spin_lock_init(&table->cache_lock);
INIT_LIST_HEAD(&table->stripe_cache);
h = table->table;
for (i = 0; i < num_entries; i++) {
cur = h + i;
INIT_LIST_HEAD(&cur->hash_list);
spin_lock_init(&cur->lock);
init_waitqueue_head(&cur->wait);
}
x = cmpxchg(&info->stripe_hash_table, NULL, table);
if (x)
kfree(x);
return 0;
}
/*
* caching an rbio means to copy anything from the
* bio_pages array into the stripe_pages array. We
* use the page uptodate bit in the stripe cache array
* to indicate if it has valid data
*
* once the caching is done, we set the cache ready
* bit.
*/
static void cache_rbio_pages(struct btrfs_raid_bio *rbio)
{
int i;
char *s;
char *d;
int ret;
ret = alloc_rbio_pages(rbio);
if (ret)
return;
for (i = 0; i < rbio->nr_pages; i++) {
if (!rbio->bio_pages[i])
continue;
s = kmap(rbio->bio_pages[i]);
d = kmap(rbio->stripe_pages[i]);
memcpy(d, s, PAGE_CACHE_SIZE);
kunmap(rbio->bio_pages[i]);
kunmap(rbio->stripe_pages[i]);
SetPageUptodate(rbio->stripe_pages[i]);
}
set_bit(RBIO_CACHE_READY_BIT, &rbio->flags);
}
/*
* we hash on the first logical address of the stripe
*/
static int rbio_bucket(struct btrfs_raid_bio *rbio)
{
u64 num = rbio->raid_map[0];
/*
* we shift down quite a bit. We're using byte
* addressing, and most of the lower bits are zeros.
* This tends to upset hash_64, and it consistently
* returns just one or two different values.
*
* shifting off the lower bits fixes things.
*/
return hash_64(num >> 16, BTRFS_STRIPE_HASH_TABLE_BITS);
}
/*
* stealing an rbio means taking all the uptodate pages from the stripe
* array in the source rbio and putting them into the destination rbio
*/
static void steal_rbio(struct btrfs_raid_bio *src, struct btrfs_raid_bio *dest)
{
int i;
struct page *s;
struct page *d;
if (!test_bit(RBIO_CACHE_READY_BIT, &src->flags))
return;
for (i = 0; i < dest->nr_pages; i++) {
s = src->stripe_pages[i];
if (!s || !PageUptodate(s)) {
continue;
}
d = dest->stripe_pages[i];
if (d)
__free_page(d);
dest->stripe_pages[i] = s;
src->stripe_pages[i] = NULL;
}
}
/*
* merging means we take the bio_list from the victim and
* splice it into the destination. The victim should
* be discarded afterwards.
*
* must be called with dest->rbio_list_lock held
*/
static void merge_rbio(struct btrfs_raid_bio *dest,
struct btrfs_raid_bio *victim)
{
bio_list_merge(&dest->bio_list, &victim->bio_list);
dest->bio_list_bytes += victim->bio_list_bytes;
bio_list_init(&victim->bio_list);
}
/*
* used to prune items that are in the cache. The caller
* must hold the hash table lock.
*/
static void __remove_rbio_from_cache(struct btrfs_raid_bio *rbio)
{
int bucket = rbio_bucket(rbio);
struct btrfs_stripe_hash_table *table;
struct btrfs_stripe_hash *h;
int freeit = 0;
/*
* check the bit again under the hash table lock.
*/
if (!test_bit(RBIO_CACHE_BIT, &rbio->flags))
return;
table = rbio->fs_info->stripe_hash_table;
h = table->table + bucket;
/* hold the lock for the bucket because we may be
* removing it from the hash table
*/
spin_lock(&h->lock);
/*
* hold the lock for the bio list because we need
* to make sure the bio list is empty
*/
spin_lock(&rbio->bio_list_lock);
if (test_and_clear_bit(RBIO_CACHE_BIT, &rbio->flags)) {
list_del_init(&rbio->stripe_cache);
table->cache_size -= 1;
freeit = 1;
/* if the bio list isn't empty, this rbio is
* still involved in an IO. We take it out
* of the cache list, and drop the ref that
* was held for the list.
*
* If the bio_list was empty, we also remove
* the rbio from the hash_table, and drop
* the corresponding ref
*/
if (bio_list_empty(&rbio->bio_list)) {
if (!list_empty(&rbio->hash_list)) {
list_del_init(&rbio->hash_list);
atomic_dec(&rbio->refs);
BUG_ON(!list_empty(&rbio->plug_list));
}
}
}
spin_unlock(&rbio->bio_list_lock);
spin_unlock(&h->lock);
if (freeit)
__free_raid_bio(rbio);
}
/*
* prune a given rbio from the cache
*/
static void remove_rbio_from_cache(struct btrfs_raid_bio *rbio)
{
struct btrfs_stripe_hash_table *table;
unsigned long flags;
if (!test_bit(RBIO_CACHE_BIT, &rbio->flags))
return;
table = rbio->fs_info->stripe_hash_table;
spin_lock_irqsave(&table->cache_lock, flags);
__remove_rbio_from_cache(rbio);
spin_unlock_irqrestore(&table->cache_lock, flags);
}
/*
* remove everything in the cache
*/
void btrfs_clear_rbio_cache(struct btrfs_fs_info *info)
{
struct btrfs_stripe_hash_table *table;
unsigned long flags;
struct btrfs_raid_bio *rbio;
table = info->stripe_hash_table;
spin_lock_irqsave(&table->cache_lock, flags);
while (!list_empty(&table->stripe_cache)) {
rbio = list_entry(table->stripe_cache.next,
struct btrfs_raid_bio,
stripe_cache);
__remove_rbio_from_cache(rbio);
}
spin_unlock_irqrestore(&table->cache_lock, flags);
}
/*
* remove all cached entries and free the hash table
* used by unmount
*/
void btrfs_free_stripe_hash_table(struct btrfs_fs_info *info)
{
if (!info->stripe_hash_table)
return;
btrfs_clear_rbio_cache(info);
kfree(info->stripe_hash_table);
info->stripe_hash_table = NULL;
}
/*
* insert an rbio into the stripe cache. It
* must have already been prepared by calling
* cache_rbio_pages
*
* If this rbio was already cached, it gets
* moved to the front of the lru.
*
* If the size of the rbio cache is too big, we
* prune an item.
*/
static void cache_rbio(struct btrfs_raid_bio *rbio)
{
struct btrfs_stripe_hash_table *table;
unsigned long flags;
if (!test_bit(RBIO_CACHE_READY_BIT, &rbio->flags))
return;
table = rbio->fs_info->stripe_hash_table;
spin_lock_irqsave(&table->cache_lock, flags);
spin_lock(&rbio->bio_list_lock);
/* bump our ref if we were not in the list before */
if (!test_and_set_bit(RBIO_CACHE_BIT, &rbio->flags))
atomic_inc(&rbio->refs);
if (!list_empty(&rbio->stripe_cache)){
list_move(&rbio->stripe_cache, &table->stripe_cache);
} else {
list_add(&rbio->stripe_cache, &table->stripe_cache);
table->cache_size += 1;
}
spin_unlock(&rbio->bio_list_lock);
if (table->cache_size > RBIO_CACHE_SIZE) {
struct btrfs_raid_bio *found;
found = list_entry(table->stripe_cache.prev,
struct btrfs_raid_bio,
stripe_cache);
if (found != rbio)
__remove_rbio_from_cache(found);
}
spin_unlock_irqrestore(&table->cache_lock, flags);
return;
}
/*
* helper function to run the xor_blocks api. It is only
* able to do MAX_XOR_BLOCKS at a time, so we need to
* loop through.
*/
static void run_xor(void **pages, int src_cnt, ssize_t len)
{
int src_off = 0;
int xor_src_cnt = 0;
void *dest = pages[src_cnt];
while(src_cnt > 0) {
xor_src_cnt = min(src_cnt, MAX_XOR_BLOCKS);
xor_blocks(xor_src_cnt, len, dest, pages + src_off);
src_cnt -= xor_src_cnt;
src_off += xor_src_cnt;
}
}
/*
* returns true if the bio list inside this rbio
* covers an entire stripe (no rmw required).
* Must be called with the bio list lock held, or
* at a time when you know it is impossible to add
* new bios into the list
*/
static int __rbio_is_full(struct btrfs_raid_bio *rbio)
{
unsigned long size = rbio->bio_list_bytes;
int ret = 1;
if (size != rbio->nr_data * rbio->stripe_len)
ret = 0;
BUG_ON(size > rbio->nr_data * rbio->stripe_len);
return ret;
}
static int rbio_is_full(struct btrfs_raid_bio *rbio)
{
unsigned long flags;
int ret;
spin_lock_irqsave(&rbio->bio_list_lock, flags);
ret = __rbio_is_full(rbio);
spin_unlock_irqrestore(&rbio->bio_list_lock, flags);
return ret;
}
/*
* returns 1 if it is safe to merge two rbios together.
* The merging is safe if the two rbios correspond to
* the same stripe and if they are both going in the same
* direction (read vs write), and if neither one is
* locked for final IO
*
* The caller is responsible for locking such that
* rmw_locked is safe to test
*/
static int rbio_can_merge(struct btrfs_raid_bio *last,
struct btrfs_raid_bio *cur)
{
if (test_bit(RBIO_RMW_LOCKED_BIT, &last->flags) ||
test_bit(RBIO_RMW_LOCKED_BIT, &cur->flags))
return 0;
/*
* we can't merge with cached rbios, since the
* idea is that when we merge the destination
* rbio is going to run our IO for us. We can
* steal from cached rbio's though, other functions
* handle that.
*/
if (test_bit(RBIO_CACHE_BIT, &last->flags) ||
test_bit(RBIO_CACHE_BIT, &cur->flags))
return 0;
if (last->raid_map[0] !=
cur->raid_map[0])
return 0;
/* reads can't merge with writes */
if (last->read_rebuild !=
cur->read_rebuild) {
return 0;
}
return 1;
}
/*
* helper to index into the pstripe
*/
static struct page *rbio_pstripe_page(struct btrfs_raid_bio *rbio, int index)
{
index += (rbio->nr_data * rbio->stripe_len) >> PAGE_CACHE_SHIFT;
return rbio->stripe_pages[index];
}
/*
* helper to index into the qstripe, returns null
* if there is no qstripe
*/
static struct page *rbio_qstripe_page(struct btrfs_raid_bio *rbio, int index)
{
if (rbio->nr_data + 1 == rbio->bbio->num_stripes)
return NULL;
index += ((rbio->nr_data + 1) * rbio->stripe_len) >>
PAGE_CACHE_SHIFT;
return rbio->stripe_pages[index];
}
/*
* The first stripe in the table for a logical address
* has the lock. rbios are added in one of three ways:
*
* 1) Nobody has the stripe locked yet. The rbio is given
* the lock and 0 is returned. The caller must start the IO
* themselves.
*
* 2) Someone has the stripe locked, but we're able to merge
* with the lock owner. The rbio is freed and the IO will
* start automatically along with the existing rbio. 1 is returned.
*
* 3) Someone has the stripe locked, but we're not able to merge.
* The rbio is added to the lock owner's plug list, or merged into
* an rbio already on the plug list. When the lock owner unlocks,
* the next rbio on the list is run and the IO is started automatically.
* 1 is returned
*
* If we return 0, the caller still owns the rbio and must continue with
* IO submission. If we return 1, the caller must assume the rbio has
* already been freed.
*/
static noinline int lock_stripe_add(struct btrfs_raid_bio *rbio)
{
int bucket = rbio_bucket(rbio);
struct btrfs_stripe_hash *h = rbio->fs_info->stripe_hash_table->table + bucket;
struct btrfs_raid_bio *cur;
struct btrfs_raid_bio *pending;
unsigned long flags;
DEFINE_WAIT(wait);
struct btrfs_raid_bio *freeit = NULL;
struct btrfs_raid_bio *cache_drop = NULL;
int ret = 0;
int walk = 0;
spin_lock_irqsave(&h->lock, flags);
list_for_each_entry(cur, &h->hash_list, hash_list) {
walk++;
if (cur->raid_map[0] == rbio->raid_map[0]) {
spin_lock(&cur->bio_list_lock);
/* can we steal this cached rbio's pages? */
if (bio_list_empty(&cur->bio_list) &&
list_empty(&cur->plug_list) &&
test_bit(RBIO_CACHE_BIT, &cur->flags) &&
!test_bit(RBIO_RMW_LOCKED_BIT, &cur->flags)) {
list_del_init(&cur->hash_list);
atomic_dec(&cur->refs);
steal_rbio(cur, rbio);
cache_drop = cur;
spin_unlock(&cur->bio_list_lock);
goto lockit;
}
/* can we merge into the lock owner? */
if (rbio_can_merge(cur, rbio)) {
merge_rbio(cur, rbio);
spin_unlock(&cur->bio_list_lock);
freeit = rbio;
ret = 1;
goto out;
}
/*
* we couldn't merge with the running
* rbio, see if we can merge with the
* pending ones. We don't have to
* check for rmw_locked because there
* is no way they are inside finish_rmw
* right now
*/
list_for_each_entry(pending, &cur->plug_list,
plug_list) {
if (rbio_can_merge(pending, rbio)) {
merge_rbio(pending, rbio);
spin_unlock(&cur->bio_list_lock);
freeit = rbio;
ret = 1;
goto out;
}
}
/* no merging, put us on the tail of the plug list,
* our rbio will be started with the currently
* running rbio unlocks
*/
list_add_tail(&rbio->plug_list, &cur->plug_list);
spin_unlock(&cur->bio_list_lock);
ret = 1;
goto out;
}
}
lockit:
atomic_inc(&rbio->refs);
list_add(&rbio->hash_list, &h->hash_list);
out:
spin_unlock_irqrestore(&h->lock, flags);
if (cache_drop)
remove_rbio_from_cache(cache_drop);
if (freeit)
__free_raid_bio(freeit);
return ret;
}
/*
* called as rmw or parity rebuild is completed. If the plug list has more
* rbios waiting for this stripe, the next one on the list will be started
*/
static noinline void unlock_stripe(struct btrfs_raid_bio *rbio)
{
int bucket;
struct btrfs_stripe_hash *h;
unsigned long flags;
int keep_cache = 0;
bucket = rbio_bucket(rbio);
h = rbio->fs_info->stripe_hash_table->table + bucket;
if (list_empty(&rbio->plug_list))
cache_rbio(rbio);
spin_lock_irqsave(&h->lock, flags);
spin_lock(&rbio->bio_list_lock);
if (!list_empty(&rbio->hash_list)) {
/*
* if we're still cached and there is no other IO
* to perform, just leave this rbio here for others
* to steal from later
*/
if (list_empty(&rbio->plug_list) &&
test_bit(RBIO_CACHE_BIT, &rbio->flags)) {
keep_cache = 1;
clear_bit(RBIO_RMW_LOCKED_BIT, &rbio->flags);
BUG_ON(!bio_list_empty(&rbio->bio_list));
goto done;
}
list_del_init(&rbio->hash_list);
atomic_dec(&rbio->refs);
/*
* we use the plug list to hold all the rbios
* waiting for the chance to lock this stripe.
* hand the lock over to one of them.
*/
if (!list_empty(&rbio->plug_list)) {
struct btrfs_raid_bio *next;
struct list_head *head = rbio->plug_list.next;
next = list_entry(head, struct btrfs_raid_bio,
plug_list);
list_del_init(&rbio->plug_list);
list_add(&next->hash_list, &h->hash_list);
atomic_inc(&next->refs);
spin_unlock(&rbio->bio_list_lock);
spin_unlock_irqrestore(&h->lock, flags);
if (next->read_rebuild)
async_read_rebuild(next);
else {
steal_rbio(rbio, next);
async_rmw_stripe(next);
}
goto done_nolock;
} else if (waitqueue_active(&h->wait)) {
spin_unlock(&rbio->bio_list_lock);
spin_unlock_irqrestore(&h->lock, flags);
wake_up(&h->wait);
goto done_nolock;
}
}
done:
spin_unlock(&rbio->bio_list_lock);
spin_unlock_irqrestore(&h->lock, flags);
done_nolock:
if (!keep_cache)
remove_rbio_from_cache(rbio);
}
static void __free_raid_bio(struct btrfs_raid_bio *rbio)
{
int i;
WARN_ON(atomic_read(&rbio->refs) < 0);
if (!atomic_dec_and_test(&rbio->refs))
return;
WARN_ON(!list_empty(&rbio->stripe_cache));
WARN_ON(!list_empty(&rbio->hash_list));
WARN_ON(!bio_list_empty(&rbio->bio_list));
for (i = 0; i < rbio->nr_pages; i++) {
if (rbio->stripe_pages[i]) {
__free_page(rbio->stripe_pages[i]);
rbio->stripe_pages[i] = NULL;
}
}
kfree(rbio->raid_map);
kfree(rbio->bbio);
kfree(rbio);
}
static void free_raid_bio(struct btrfs_raid_bio *rbio)
{
unlock_stripe(rbio);
__free_raid_bio(rbio);
}
/*
* this frees the rbio and runs through all the bios in the
* bio_list and calls end_io on them
*/
static void rbio_orig_end_io(struct btrfs_raid_bio *rbio, int err, int uptodate)
{
struct bio *cur = bio_list_get(&rbio->bio_list);
struct bio *next;
free_raid_bio(rbio);
while (cur) {
next = cur->bi_next;
cur->bi_next = NULL;
if (uptodate)
set_bit(BIO_UPTODATE, &cur->bi_flags);
bio_endio(cur, err);
cur = next;
}
}
/*
* end io function used by finish_rmw. When we finally
* get here, we've written a full stripe
*/
static void raid_write_end_io(struct bio *bio, int err)
{
struct btrfs_raid_bio *rbio = bio->bi_private;
if (err)
fail_bio_stripe(rbio, bio);
bio_put(bio);
if (!atomic_dec_and_test(&rbio->bbio->stripes_pending))
return;
err = 0;
/* OK, we have read all the stripes we need to. */
if (atomic_read(&rbio->bbio->error) > rbio->bbio->max_errors)
err = -EIO;
rbio_orig_end_io(rbio, err, 0);
return;
}
/*
* the read/modify/write code wants to use the original bio for
* any pages it included, and then use the rbio for everything
* else. This function decides if a given index (stripe number)
* and page number in that stripe fall inside the original bio
* or the rbio.
*
* if you set bio_list_only, you'll get a NULL back for any ranges
* that are outside the bio_list
*
* This doesn't take any refs on anything, you get a bare page pointer
* and the caller must bump refs as required.
*
* You must call index_rbio_pages once before you can trust
* the answers from this function.
*/
static struct page *page_in_rbio(struct btrfs_raid_bio *rbio,
int index, int pagenr, int bio_list_only)
{
int chunk_page;
struct page *p = NULL;
chunk_page = index * (rbio->stripe_len >> PAGE_SHIFT) + pagenr;
spin_lock_irq(&rbio->bio_list_lock);
p = rbio->bio_pages[chunk_page];
spin_unlock_irq(&rbio->bio_list_lock);
if (p || bio_list_only)
return p;
return rbio->stripe_pages[chunk_page];
}
/*
* number of pages we need for the entire stripe across all the
* drives
*/
static unsigned long rbio_nr_pages(unsigned long stripe_len, int nr_stripes)
{
unsigned long nr = stripe_len * nr_stripes;
return (nr + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
}
/*
* allocation and initial setup for the btrfs_raid_bio. Not
* this does not allocate any pages for rbio->pages.
*/
static struct btrfs_raid_bio *alloc_rbio(struct btrfs_root *root,
struct btrfs_bio *bbio, u64 *raid_map,
u64 stripe_len)
{
struct btrfs_raid_bio *rbio;
int nr_data = 0;
int num_pages = rbio_nr_pages(stripe_len, bbio->num_stripes);
void *p;
rbio = kzalloc(sizeof(*rbio) + num_pages * sizeof(struct page *) * 2,
GFP_NOFS);
if (!rbio) {
kfree(raid_map);
kfree(bbio);
return ERR_PTR(-ENOMEM);
}
bio_list_init(&rbio->bio_list);
INIT_LIST_HEAD(&rbio->plug_list);
spin_lock_init(&rbio->bio_list_lock);
INIT_LIST_HEAD(&rbio->stripe_cache);
INIT_LIST_HEAD(&rbio->hash_list);
rbio->bbio = bbio;
rbio->raid_map = raid_map;
rbio->fs_info = root->fs_info;
rbio->stripe_len = stripe_len;
rbio->nr_pages = num_pages;
rbio->faila = -1;
rbio->failb = -1;
atomic_set(&rbio->refs, 1);
/*
* the stripe_pages and bio_pages array point to the extra
* memory we allocated past the end of the rbio
*/
p = rbio + 1;
rbio->stripe_pages = p;
rbio->bio_pages = p + sizeof(struct page *) * num_pages;
if (raid_map[bbio->num_stripes - 1] == RAID6_Q_STRIPE)
nr_data = bbio->num_stripes - 2;
else
nr_data = bbio->num_stripes - 1;
rbio->nr_data = nr_data;
return rbio;
}
/* allocate pages for all the stripes in the bio, including parity */
static int alloc_rbio_pages(struct btrfs_raid_bio *rbio)
{
int i;
struct page *page;
for (i = 0; i < rbio->nr_pages; i++) {
if (rbio->stripe_pages[i])
continue;
page = alloc_page(GFP_NOFS | __GFP_HIGHMEM);
if (!page)
return -ENOMEM;
rbio->stripe_pages[i] = page;
ClearPageUptodate(page);
}
return 0;
}
/* allocate pages for just the p/q stripes */
static int alloc_rbio_parity_pages(struct btrfs_raid_bio *rbio)
{
int i;
struct page *page;
i = (rbio->nr_data * rbio->stripe_len) >> PAGE_CACHE_SHIFT;
for (; i < rbio->nr_pages; i++) {
if (rbio->stripe_pages[i])
continue;
page = alloc_page(GFP_NOFS | __GFP_HIGHMEM);
if (!page)
return -ENOMEM;
rbio->stripe_pages[i] = page;
}
return 0;
}
/*
* add a single page from a specific stripe into our list of bios for IO
* this will try to merge into existing bios if possible, and returns
* zero if all went well.
*/
int rbio_add_io_page(struct btrfs_raid_bio *rbio,
struct bio_list *bio_list,
struct page *page,
int stripe_nr,
unsigned long page_index,
unsigned long bio_max_len)
{
struct bio *last = bio_list->tail;
u64 last_end = 0;
int ret;
struct bio *bio;
struct btrfs_bio_stripe *stripe;
u64 disk_start;
stripe = &rbio->bbio->stripes[stripe_nr];
disk_start = stripe->physical + (page_index << PAGE_CACHE_SHIFT);
/* if the device is missing, just fail this stripe */
if (!stripe->dev->bdev)
return fail_rbio_index(rbio, stripe_nr);
/* see if we can add this page onto our existing bio */
if (last) {
last_end = (u64)last->bi_sector << 9;
last_end += last->bi_size;
/*
* we can't merge these if they are from different
* devices or if they are not contiguous
*/
if (last_end == disk_start && stripe->dev->bdev &&
test_bit(BIO_UPTODATE, &last->bi_flags) &&
last->bi_bdev == stripe->dev->bdev) {
ret = bio_add_page(last, page, PAGE_CACHE_SIZE, 0);
if (ret == PAGE_CACHE_SIZE)
return 0;
}
}
/* put a new bio on the list */
bio = bio_alloc(GFP_NOFS, bio_max_len >> PAGE_SHIFT?:1);
if (!bio)
return -ENOMEM;
bio->bi_size = 0;
bio->bi_bdev = stripe->dev->bdev;
bio->bi_sector = disk_start >> 9;
set_bit(BIO_UPTODATE, &bio->bi_flags);
bio_add_page(bio, page, PAGE_CACHE_SIZE, 0);
bio_list_add(bio_list, bio);
return 0;
}
/*
* while we're doing the read/modify/write cycle, we could
* have errors in reading pages off the disk. This checks
* for errors and if we're not able to read the page it'll
* trigger parity reconstruction. The rmw will be finished
* after we've reconstructed the failed stripes
*/
static void validate_rbio_for_rmw(struct btrfs_raid_bio *rbio)
{
if (rbio->faila >= 0 || rbio->failb >= 0) {
BUG_ON(rbio->faila == rbio->bbio->num_stripes - 1);
__raid56_parity_recover(rbio);
} else {
finish_rmw(rbio);
}
}
/*
* these are just the pages from the rbio array, not from anything
* the FS sent down to us
*/
static struct page *rbio_stripe_page(struct btrfs_raid_bio *rbio, int stripe, int page)
{
int index;
index = stripe * (rbio->stripe_len >> PAGE_CACHE_SHIFT);
index += page;
return rbio->stripe_pages[index];
}
/*
* helper function to walk our bio list and populate the bio_pages array with
* the result. This seems expensive, but it is faster than constantly
* searching through the bio list as we setup the IO in finish_rmw or stripe
* reconstruction.
*
* This must be called before you trust the answers from page_in_rbio
*/
static void index_rbio_pages(struct btrfs_raid_bio *rbio)
{
struct bio *bio;
u64 start;
unsigned long stripe_offset;
unsigned long page_index;
struct page *p;
int i;
spin_lock_irq(&rbio->bio_list_lock);
bio_list_for_each(bio, &rbio->bio_list) {
start = (u64)bio->bi_sector << 9;
stripe_offset = start - rbio->raid_map[0];
page_index = stripe_offset >> PAGE_CACHE_SHIFT;
for (i = 0; i < bio->bi_vcnt; i++) {
p = bio->bi_io_vec[i].bv_page;
rbio->bio_pages[page_index + i] = p;
}
}
spin_unlock_irq(&rbio->bio_list_lock);
}
/*
* this is called from one of two situations. We either
* have a full stripe from the higher layers, or we've read all
* the missing bits off disk.
*
* This will calculate the parity and then send down any
* changed blocks.
*/
static noinline void finish_rmw(struct btrfs_raid_bio *rbio)
{
struct btrfs_bio *bbio = rbio->bbio;
void *pointers[bbio->num_stripes];
int stripe_len = rbio->stripe_len;
int nr_data = rbio->nr_data;
int stripe;
int pagenr;
int p_stripe = -1;
int q_stripe = -1;
struct bio_list bio_list;
struct bio *bio;
int pages_per_stripe = stripe_len >> PAGE_CACHE_SHIFT;
int ret;
bio_list_init(&bio_list);
if (bbio->num_stripes - rbio->nr_data == 1) {
p_stripe = bbio->num_stripes - 1;
} else if (bbio->num_stripes - rbio->nr_data == 2) {
p_stripe = bbio->num_stripes - 2;
q_stripe = bbio->num_stripes - 1;
} else {
BUG();
}
/* at this point we either have a full stripe,
* or we've read the full stripe from the drive.
* recalculate the parity and write the new results.
*
* We're not allowed to add any new bios to the
* bio list here, anyone else that wants to
* change this stripe needs to do their own rmw.
*/
spin_lock_irq(&rbio->bio_list_lock);
set_bit(RBIO_RMW_LOCKED_BIT, &rbio->flags);
spin_unlock_irq(&rbio->bio_list_lock);
atomic_set(&rbio->bbio->error, 0);
/*
* now that we've set rmw_locked, run through the
* bio list one last time and map the page pointers
*
* We don't cache full rbios because we're assuming
* the higher layers are unlikely to use this area of
* the disk again soon. If they do use it again,
* hopefully they will send another full bio.
*/
index_rbio_pages(rbio);
if (!rbio_is_full(rbio))
cache_rbio_pages(rbio);
else
clear_bit(RBIO_CACHE_READY_BIT, &rbio->flags);
for (pagenr = 0; pagenr < pages_per_stripe; pagenr++) {
struct page *p;
/* first collect one page from each data stripe */
for (stripe = 0; stripe < nr_data; stripe++) {
p = page_in_rbio(rbio, stripe, pagenr, 0);
pointers[stripe] = kmap(p);
}
/* then add the parity stripe */
p = rbio_pstripe_page(rbio, pagenr);
SetPageUptodate(p);
pointers[stripe++] = kmap(p);
if (q_stripe != -1) {
/*
* raid6, add the qstripe and call the
* library function to fill in our p/q
*/
p = rbio_qstripe_page(rbio, pagenr);
SetPageUptodate(p);
pointers[stripe++] = kmap(p);
raid6_call.gen_syndrome(bbio->num_stripes, PAGE_SIZE,
pointers);
} else {
/* raid5 */
memcpy(pointers[nr_data], pointers[0], PAGE_SIZE);
run_xor(pointers + 1, nr_data - 1, PAGE_CACHE_SIZE);
}
for (stripe = 0; stripe < bbio->num_stripes; stripe++)
kunmap(page_in_rbio(rbio, stripe, pagenr, 0));
}
/*
* time to start writing. Make bios for everything from the
* higher layers (the bio_list in our rbio) and our p/q. Ignore
* everything else.
*/
for (stripe = 0; stripe < bbio->num_stripes; stripe++) {
for (pagenr = 0; pagenr < pages_per_stripe; pagenr++) {
struct page *page;
if (stripe < rbio->nr_data) {
page = page_in_rbio(rbio, stripe, pagenr, 1);
if (!page)
continue;
} else {
page = rbio_stripe_page(rbio, stripe, pagenr);
}
ret = rbio_add_io_page(rbio, &bio_list,
page, stripe, pagenr, rbio->stripe_len);
if (ret)
goto cleanup;
}
}
atomic_set(&bbio->stripes_pending, bio_list_size(&bio_list));
BUG_ON(atomic_read(&bbio->stripes_pending) == 0);
while (1) {
bio = bio_list_pop(&bio_list);
if (!bio)
break;
bio->bi_private = rbio;
bio->bi_end_io = raid_write_end_io;
BUG_ON(!test_bit(BIO_UPTODATE, &bio->bi_flags));
submit_bio(WRITE, bio);
}
return;
cleanup:
rbio_orig_end_io(rbio, -EIO, 0);
}
/*
* helper to find the stripe number for a given bio. Used to figure out which
* stripe has failed. This expects the bio to correspond to a physical disk,
* so it looks up based on physical sector numbers.
*/
static int find_bio_stripe(struct btrfs_raid_bio *rbio,
struct bio *bio)
{
u64 physical = bio->bi_sector;
u64 stripe_start;
int i;
struct btrfs_bio_stripe *stripe;
physical <<= 9;
for (i = 0; i < rbio->bbio->num_stripes; i++) {
stripe = &rbio->bbio->stripes[i];
stripe_start = stripe->physical;
if (physical >= stripe_start &&
physical < stripe_start + rbio->stripe_len) {
return i;
}
}
return -1;
}
/*
* helper to find the stripe number for a given
* bio (before mapping). Used to figure out which stripe has
* failed. This looks up based on logical block numbers.
*/
static int find_logical_bio_stripe(struct btrfs_raid_bio *rbio,
struct bio *bio)
{
u64 logical = bio->bi_sector;
u64 stripe_start;
int i;
logical <<= 9;
for (i = 0; i < rbio->nr_data; i++) {
stripe_start = rbio->raid_map[i];
if (logical >= stripe_start &&
logical < stripe_start + rbio->stripe_len) {
return i;
}
}
return -1;
}
/*
* returns -EIO if we had too many failures
*/
static int fail_rbio_index(struct btrfs_raid_bio *rbio, int failed)
{
unsigned long flags;
int ret = 0;
spin_lock_irqsave(&rbio->bio_list_lock, flags);
/* we already know this stripe is bad, move on */
if (rbio->faila == failed || rbio->failb == failed)
goto out;
if (rbio->faila == -1) {
/* first failure on this rbio */
rbio->faila = failed;
atomic_inc(&rbio->bbio->error);
} else if (rbio->failb == -1) {
/* second failure on this rbio */
rbio->failb = failed;
atomic_inc(&rbio->bbio->error);
} else {
ret = -EIO;
}
out:
spin_unlock_irqrestore(&rbio->bio_list_lock, flags);
return ret;
}
/*
* helper to fail a stripe based on a physical disk
* bio.
*/
static int fail_bio_stripe(struct btrfs_raid_bio *rbio,
struct bio *bio)
{
int failed = find_bio_stripe(rbio, bio);
if (failed < 0)
return -EIO;
return fail_rbio_index(rbio, failed);
}
/*
* this sets each page in the bio uptodate. It should only be used on private
* rbio pages, nothing that comes in from the higher layers
*/
static void set_bio_pages_uptodate(struct bio *bio)
{
int i;
struct page *p;
for (i = 0; i < bio->bi_vcnt; i++) {
p = bio->bi_io_vec[i].bv_page;
SetPageUptodate(p);
}
}
/*
* end io for the read phase of the rmw cycle. All the bios here are physical
* stripe bios we've read from the disk so we can recalculate the parity of the
* stripe.
*
* This will usually kick off finish_rmw once all the bios are read in, but it
* may trigger parity reconstruction if we had any errors along the way
*/
static void raid_rmw_end_io(struct bio *bio, int err)
{
struct btrfs_raid_bio *rbio = bio->bi_private;
if (err)
fail_bio_stripe(rbio, bio);
else
set_bio_pages_uptodate(bio);
bio_put(bio);
if (!atomic_dec_and_test(&rbio->bbio->stripes_pending))
return;
err = 0;
if (atomic_read(&rbio->bbio->error) > rbio->bbio->max_errors)
goto cleanup;
/*
* this will normally call finish_rmw to start our write
* but if there are any failed stripes we'll reconstruct
* from parity first
*/
validate_rbio_for_rmw(rbio);
return;
cleanup:
rbio_orig_end_io(rbio, -EIO, 0);
}
static void async_rmw_stripe(struct btrfs_raid_bio *rbio)
{
rbio->work.flags = 0;
rbio->work.func = rmw_work;
btrfs_queue_worker(&rbio->fs_info->rmw_workers,
&rbio->work);
}
static void async_read_rebuild(struct btrfs_raid_bio *rbio)
{
rbio->work.flags = 0;
rbio->work.func = read_rebuild_work;
btrfs_queue_worker(&rbio->fs_info->rmw_workers,
&rbio->work);
}
/*
* the stripe must be locked by the caller. It will
* unlock after all the writes are done
*/
static int raid56_rmw_stripe(struct btrfs_raid_bio *rbio)
{
int bios_to_read = 0;
struct btrfs_bio *bbio = rbio->bbio;
struct bio_list bio_list;
int ret;
int nr_pages = (rbio->stripe_len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
int pagenr;
int stripe;
struct bio *bio;
bio_list_init(&bio_list);
ret = alloc_rbio_pages(rbio);
if (ret)
goto cleanup;
index_rbio_pages(rbio);
atomic_set(&rbio->bbio->error, 0);
/*
* build a list of bios to read all the missing parts of this
* stripe
*/
for (stripe = 0; stripe < rbio->nr_data; stripe++) {
for (pagenr = 0; pagenr < nr_pages; pagenr++) {
struct page *page;
/*
* we want to find all the pages missing from
* the rbio and read them from the disk. If
* page_in_rbio finds a page in the bio list
* we don't need to read it off the stripe.
*/
page = page_in_rbio(rbio, stripe, pagenr, 1);
if (page)
continue;
page = rbio_stripe_page(rbio, stripe, pagenr);
/*
* the bio cache may have handed us an uptodate
* page. If so, be happy and use it
*/
if (PageUptodate(page))
continue;
ret = rbio_add_io_page(rbio, &bio_list, page,
stripe, pagenr, rbio->stripe_len);
if (ret)
goto cleanup;
}
}
bios_to_read = bio_list_size(&bio_list);
if (!bios_to_read) {
/*
* this can happen if others have merged with
* us, it means there is nothing left to read.
* But if there are missing devices it may not be
* safe to do the full stripe write yet.
*/
goto finish;
}
/*
* the bbio may be freed once we submit the last bio. Make sure
* not to touch it after that
*/
atomic_set(&bbio->stripes_pending, bios_to_read);
while (1) {
bio = bio_list_pop(&bio_list);
if (!bio)
break;
bio->bi_private = rbio;
bio->bi_end_io = raid_rmw_end_io;
btrfs_bio_wq_end_io(rbio->fs_info, bio,
BTRFS_WQ_ENDIO_RAID56);
BUG_ON(!test_bit(BIO_UPTODATE, &bio->bi_flags));
submit_bio(READ, bio);
}
/* the actual write will happen once the reads are done */
return 0;
cleanup:
rbio_orig_end_io(rbio, -EIO, 0);
return -EIO;
finish:
validate_rbio_for_rmw(rbio);
return 0;
}
/*
* if the upper layers pass in a full stripe, we thank them by only allocating
* enough pages to hold the parity, and sending it all down quickly.
*/
static int full_stripe_write(struct btrfs_raid_bio *rbio)
{
int ret;
ret = alloc_rbio_parity_pages(rbio);
if (ret)
return ret;
ret = lock_stripe_add(rbio);
if (ret == 0)
finish_rmw(rbio);
return 0;
}
/*
* partial stripe writes get handed over to async helpers.
* We're really hoping to merge a few more writes into this
* rbio before calculating new parity
*/
static int partial_stripe_write(struct btrfs_raid_bio *rbio)
{
int ret;
ret = lock_stripe_add(rbio);
if (ret == 0)
async_rmw_stripe(rbio);
return 0;
}
/*
* sometimes while we were reading from the drive to
* recalculate parity, enough new bios come into create
* a full stripe. So we do a check here to see if we can
* go directly to finish_rmw
*/
static int __raid56_parity_write(struct btrfs_raid_bio *rbio)
{
/* head off into rmw land if we don't have a full stripe */
if (!rbio_is_full(rbio))
return partial_stripe_write(rbio);
return full_stripe_write(rbio);
}
/*
* We use plugging call backs to collect full stripes.
* Any time we get a partial stripe write while plugged
* we collect it into a list. When the unplug comes down,
* we sort the list by logical block number and merge
* everything we can into the same rbios
*/
struct btrfs_plug_cb {
struct blk_plug_cb cb;
struct btrfs_fs_info *info;
struct list_head rbio_list;
struct btrfs_work work;
};
/*
* rbios on the plug list are sorted for easier merging.
*/
static int plug_cmp(void *priv, struct list_head *a, struct list_head *b)
{
struct btrfs_raid_bio *ra = container_of(a, struct btrfs_raid_bio,
plug_list);
struct btrfs_raid_bio *rb = container_of(b, struct btrfs_raid_bio,
plug_list);
u64 a_sector = ra->bio_list.head->bi_sector;
u64 b_sector = rb->bio_list.head->bi_sector;
if (a_sector < b_sector)
return -1;
if (a_sector > b_sector)
return 1;
return 0;
}
static void run_plug(struct btrfs_plug_cb *plug)
{
struct btrfs_raid_bio *cur;
struct btrfs_raid_bio *last = NULL;
/*
* sort our plug list then try to merge
* everything we can in hopes of creating full
* stripes.
*/
list_sort(NULL, &plug->rbio_list, plug_cmp);
while (!list_empty(&plug->rbio_list)) {
cur = list_entry(plug->rbio_list.next,
struct btrfs_raid_bio, plug_list);
list_del_init(&cur->plug_list);
if (rbio_is_full(cur)) {
/* we have a full stripe, send it down */
full_stripe_write(cur);
continue;
}
if (last) {
if (rbio_can_merge(last, cur)) {
merge_rbio(last, cur);
__free_raid_bio(cur);
continue;
}
__raid56_parity_write(last);
}
last = cur;
}
if (last) {
__raid56_parity_write(last);
}
kfree(plug);
}
/*
* if the unplug comes from schedule, we have to push the
* work off to a helper thread
*/
static void unplug_work(struct btrfs_work *work)
{
struct btrfs_plug_cb *plug;
plug = container_of(work, struct btrfs_plug_cb, work);
run_plug(plug);
}
static void btrfs_raid_unplug(struct blk_plug_cb *cb, bool from_schedule)
{
struct btrfs_plug_cb *plug;
plug = container_of(cb, struct btrfs_plug_cb, cb);
if (from_schedule) {
plug->work.flags = 0;
plug->work.func = unplug_work;
btrfs_queue_worker(&plug->info->rmw_workers,
&plug->work);
return;
}
run_plug(plug);
}
/*
* our main entry point for writes from the rest of the FS.
*/
int raid56_parity_write(struct btrfs_root *root, struct bio *bio,
struct btrfs_bio *bbio, u64 *raid_map,
u64 stripe_len)
{
struct btrfs_raid_bio *rbio;
struct btrfs_plug_cb *plug = NULL;
struct blk_plug_cb *cb;
rbio = alloc_rbio(root, bbio, raid_map, stripe_len);
if (IS_ERR(rbio)) {
kfree(raid_map);
kfree(bbio);
return PTR_ERR(rbio);
}
bio_list_add(&rbio->bio_list, bio);
rbio->bio_list_bytes = bio->bi_size;
/*
* don't plug on full rbios, just get them out the door
* as quickly as we can
*/
if (rbio_is_full(rbio))
return full_stripe_write(rbio);
cb = blk_check_plugged(btrfs_raid_unplug, root->fs_info,
sizeof(*plug));
if (cb) {
plug = container_of(cb, struct btrfs_plug_cb, cb);
if (!plug->info) {
plug->info = root->fs_info;
INIT_LIST_HEAD(&plug->rbio_list);
}
list_add_tail(&rbio->plug_list, &plug->rbio_list);
} else {
return __raid56_parity_write(rbio);
}
return 0;
}
/*
* all parity reconstruction happens here. We've read in everything
* we can find from the drives and this does the heavy lifting of
* sorting the good from the bad.
*/
static void __raid_recover_end_io(struct btrfs_raid_bio *rbio)
{
int pagenr, stripe;
void **pointers;
int faila = -1, failb = -1;
int nr_pages = (rbio->stripe_len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
struct page *page;
int err;
int i;
pointers = kzalloc(rbio->bbio->num_stripes * sizeof(void *),
GFP_NOFS);
if (!pointers) {
err = -ENOMEM;
goto cleanup_io;
}
faila = rbio->faila;
failb = rbio->failb;
if (rbio->read_rebuild) {
spin_lock_irq(&rbio->bio_list_lock);
set_bit(RBIO_RMW_LOCKED_BIT, &rbio->flags);
spin_unlock_irq(&rbio->bio_list_lock);
}
index_rbio_pages(rbio);
for (pagenr = 0; pagenr < nr_pages; pagenr++) {
/* setup our array of pointers with pages
* from each stripe
*/
for (stripe = 0; stripe < rbio->bbio->num_stripes; stripe++) {
/*
* if we're rebuilding a read, we have to use
* pages from the bio list
*/
if (rbio->read_rebuild &&
(stripe == faila || stripe == failb)) {
page = page_in_rbio(rbio, stripe, pagenr, 0);
} else {
page = rbio_stripe_page(rbio, stripe, pagenr);
}
pointers[stripe] = kmap(page);
}
/* all raid6 handling here */
if (rbio->raid_map[rbio->bbio->num_stripes - 1] ==
RAID6_Q_STRIPE) {
/*
* single failure, rebuild from parity raid5
* style
*/
if (failb < 0) {
if (faila == rbio->nr_data) {
/*
* Just the P stripe has failed, without
* a bad data or Q stripe.
* TODO, we should redo the xor here.
*/
err = -EIO;
goto cleanup;
}
/*
* a single failure in raid6 is rebuilt
* in the pstripe code below
*/
goto pstripe;
}
/* make sure our ps and qs are in order */
if (faila > failb) {
int tmp = failb;
failb = faila;
faila = tmp;
}
/* if the q stripe is failed, do a pstripe reconstruction
* from the xors.
* If both the q stripe and the P stripe are failed, we're
* here due to a crc mismatch and we can't give them the
* data they want
*/
if (rbio->raid_map[failb] == RAID6_Q_STRIPE) {
if (rbio->raid_map[faila] == RAID5_P_STRIPE) {
err = -EIO;
goto cleanup;
}
/*
* otherwise we have one bad data stripe and
* a good P stripe. raid5!
*/
goto pstripe;
}
if (rbio->raid_map[failb] == RAID5_P_STRIPE) {
raid6_datap_recov(rbio->bbio->num_stripes,
PAGE_SIZE, faila, pointers);
} else {
raid6_2data_recov(rbio->bbio->num_stripes,
PAGE_SIZE, faila, failb,
pointers);
}
} else {
void *p;
/* rebuild from P stripe here (raid5 or raid6) */
BUG_ON(failb != -1);
pstripe:
/* Copy parity block into failed block to start with */
memcpy(pointers[faila],
pointers[rbio->nr_data],
PAGE_CACHE_SIZE);
/* rearrange the pointer array */
p = pointers[faila];
for (stripe = faila; stripe < rbio->nr_data - 1; stripe++)
pointers[stripe] = pointers[stripe + 1];
pointers[rbio->nr_data - 1] = p;
/* xor in the rest */
run_xor(pointers, rbio->nr_data - 1, PAGE_CACHE_SIZE);
}
/* if we're doing this rebuild as part of an rmw, go through
* and set all of our private rbio pages in the
* failed stripes as uptodate. This way finish_rmw will
* know they can be trusted. If this was a read reconstruction,
* other endio functions will fiddle the uptodate bits
*/
if (!rbio->read_rebuild) {
for (i = 0; i < nr_pages; i++) {
if (faila != -1) {
page = rbio_stripe_page(rbio, faila, i);
SetPageUptodate(page);
}
if (failb != -1) {
page = rbio_stripe_page(rbio, failb, i);
SetPageUptodate(page);
}
}
}
for (stripe = 0; stripe < rbio->bbio->num_stripes; stripe++) {
/*
* if we're rebuilding a read, we have to use
* pages from the bio list
*/
if (rbio->read_rebuild &&
(stripe == faila || stripe == failb)) {
page = page_in_rbio(rbio, stripe, pagenr, 0);
} else {
page = rbio_stripe_page(rbio, stripe, pagenr);
}
kunmap(page);
}
}
err = 0;
cleanup:
kfree(pointers);
cleanup_io:
if (rbio->read_rebuild) {
if (err == 0)
cache_rbio_pages(rbio);
else
clear_bit(RBIO_CACHE_READY_BIT, &rbio->flags);
rbio_orig_end_io(rbio, err, err == 0);
} else if (err == 0) {
rbio->faila = -1;
rbio->failb = -1;
finish_rmw(rbio);
} else {
rbio_orig_end_io(rbio, err, 0);
}
}
/*
* This is called only for stripes we've read from disk to
* reconstruct the parity.
*/
static void raid_recover_end_io(struct bio *bio, int err)
{
struct btrfs_raid_bio *rbio = bio->bi_private;
/*
* we only read stripe pages off the disk, set them
* up to date if there were no errors
*/
if (err)
fail_bio_stripe(rbio, bio);
else
set_bio_pages_uptodate(bio);
bio_put(bio);
if (!atomic_dec_and_test(&rbio->bbio->stripes_pending))
return;
if (atomic_read(&rbio->bbio->error) > rbio->bbio->max_errors)
rbio_orig_end_io(rbio, -EIO, 0);
else
__raid_recover_end_io(rbio);
}
/*
* reads everything we need off the disk to reconstruct
* the parity. endio handlers trigger final reconstruction
* when the IO is done.
*
* This is used both for reads from the higher layers and for
* parity construction required to finish a rmw cycle.
*/
static int __raid56_parity_recover(struct btrfs_raid_bio *rbio)
{
int bios_to_read = 0;
struct btrfs_bio *bbio = rbio->bbio;
struct bio_list bio_list;
int ret;
int nr_pages = (rbio->stripe_len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
int pagenr;
int stripe;
struct bio *bio;
bio_list_init(&bio_list);
ret = alloc_rbio_pages(rbio);
if (ret)
goto cleanup;
atomic_set(&rbio->bbio->error, 0);
/*
* read everything that hasn't failed. Thanks to the
* stripe cache, it is possible that some or all of these
* pages are going to be uptodate.
*/
for (stripe = 0; stripe < bbio->num_stripes; stripe++) {
if (rbio->faila == stripe ||
rbio->failb == stripe)
continue;
for (pagenr = 0; pagenr < nr_pages; pagenr++) {
struct page *p;
/*
* the rmw code may have already read this
* page in
*/
p = rbio_stripe_page(rbio, stripe, pagenr);
if (PageUptodate(p))
continue;
ret = rbio_add_io_page(rbio, &bio_list,
rbio_stripe_page(rbio, stripe, pagenr),
stripe, pagenr, rbio->stripe_len);
if (ret < 0)
goto cleanup;
}
}
bios_to_read = bio_list_size(&bio_list);
if (!bios_to_read) {
/*
* we might have no bios to read just because the pages
* were up to date, or we might have no bios to read because
* the devices were gone.
*/
if (atomic_read(&rbio->bbio->error) <= rbio->bbio->max_errors) {
__raid_recover_end_io(rbio);
goto out;
} else {
goto cleanup;
}
}
/*
* the bbio may be freed once we submit the last bio. Make sure
* not to touch it after that
*/
atomic_set(&bbio->stripes_pending, bios_to_read);
while (1) {
bio = bio_list_pop(&bio_list);
if (!bio)
break;
bio->bi_private = rbio;
bio->bi_end_io = raid_recover_end_io;
btrfs_bio_wq_end_io(rbio->fs_info, bio,
BTRFS_WQ_ENDIO_RAID56);
BUG_ON(!test_bit(BIO_UPTODATE, &bio->bi_flags));
submit_bio(READ, bio);
}
out:
return 0;
cleanup:
if (rbio->read_rebuild)
rbio_orig_end_io(rbio, -EIO, 0);
return -EIO;
}
/*
* the main entry point for reads from the higher layers. This
* is really only called when the normal read path had a failure,
* so we assume the bio they send down corresponds to a failed part
* of the drive.
*/
int raid56_parity_recover(struct btrfs_root *root, struct bio *bio,
struct btrfs_bio *bbio, u64 *raid_map,
u64 stripe_len, int mirror_num)
{
struct btrfs_raid_bio *rbio;
int ret;
rbio = alloc_rbio(root, bbio, raid_map, stripe_len);
if (IS_ERR(rbio)) {
return PTR_ERR(rbio);
}
rbio->read_rebuild = 1;
bio_list_add(&rbio->bio_list, bio);
rbio->bio_list_bytes = bio->bi_size;
rbio->faila = find_logical_bio_stripe(rbio, bio);
if (rbio->faila == -1) {
BUG();
kfree(rbio);
return -EIO;
}
/*
* reconstruct from the q stripe if they are
* asking for mirror 3
*/
if (mirror_num == 3)
rbio->failb = bbio->num_stripes - 2;
ret = lock_stripe_add(rbio);
/*
* __raid56_parity_recover will end the bio with
* any errors it hits. We don't want to return
* its error value up the stack because our caller
* will end up calling bio_endio with any nonzero
* return
*/
if (ret == 0)
__raid56_parity_recover(rbio);
/*
* our rbio has been added to the list of
* rbios that will be handled after the
* currently lock owner is done
*/
return 0;
}
static void rmw_work(struct btrfs_work *work)
{
struct btrfs_raid_bio *rbio;
rbio = container_of(work, struct btrfs_raid_bio, work);
raid56_rmw_stripe(rbio);
}
static void read_rebuild_work(struct btrfs_work *work)
{
struct btrfs_raid_bio *rbio;
rbio = container_of(work, struct btrfs_raid_bio, work);
__raid56_parity_recover(rbio);
}
fs/btrfs/raid56.h 0 → 100644
浏览文件 @ e942f883
/*
* Copyright (C) 2012 Fusion-io All rights reserved.
* Copyright (C) 2012 Intel Corp. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License v2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
#ifndef __BTRFS_RAID56__
#define __BTRFS_RAID56__
static inline int nr_parity_stripes(struct map_lookup *map)
{
if (map->type & BTRFS_BLOCK_GROUP_RAID5)
return 1;
else if (map->type & BTRFS_BLOCK_GROUP_RAID6)
return 2;
else
return 0;
}
static inline int nr_data_stripes(struct map_lookup *map)
{
return map->num_stripes - nr_parity_stripes(map);
}
#define RAID5_P_STRIPE ((u64)-2)
#define RAID6_Q_STRIPE ((u64)-1)
#define is_parity_stripe(x) (((x) == RAID5_P_STRIPE) || \
((x) == RAID6_Q_STRIPE))
int raid56_parity_recover(struct btrfs_root *root, struct bio *bio,
struct btrfs_bio *bbio, u64 *raid_map,
u64 stripe_len, int mirror_num);
int raid56_parity_write(struct btrfs_root *root, struct bio *bio,
struct btrfs_bio *bbio, u64 *raid_map,
u64 stripe_len);
int btrfs_alloc_stripe_hash_table(struct btrfs_fs_info *info);
void btrfs_free_stripe_hash_table(struct btrfs_fs_info *info);
#endif
fs/btrfs/scrub.c
浏览文件 @ e942f883
......@@ -28,6 +28,7 @@
#include "dev-replace.h"
#include "check-integrity.h"
#include "rcu-string.h"
#include "raid56.h"
/*
* This is only the first step towards a full-features scrub. It reads all
......@@ -2254,6 +2255,13 @@ static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx,
struct btrfs_device *extent_dev;
int extent_mirror_num;
if (map->type & (BTRFS_BLOCK_GROUP_RAID5 |
BTRFS_BLOCK_GROUP_RAID6)) {
if (num >= nr_data_stripes(map)) {
return 0;
}
}
nstripes = length;
offset = 0;
do_div(nstripes, map->stripe_len);
......
fs/btrfs/transaction.c
浏览文件 @ e942f883
......@@ -167,6 +167,9 @@ static noinline int join_transaction(struct btrfs_root *root, int type)
spin_lock_init(&cur_trans->commit_lock);
spin_lock_init(&cur_trans->delayed_refs.lock);
atomic_set(&cur_trans->delayed_refs.procs_running_refs, 0);
atomic_set(&cur_trans->delayed_refs.ref_seq, 0);
init_waitqueue_head(&cur_trans->delayed_refs.wait);
INIT_LIST_HEAD(&cur_trans->pending_snapshots);
INIT_LIST_HEAD(&cur_trans->ordered_operations);
......@@ -637,7 +640,7 @@ static int __btrfs_end_transaction(struct btrfs_trans_handle *trans,
if (!list_empty(&trans->new_bgs))
btrfs_create_pending_block_groups(trans, root);
while (count < 2) {
while (count < 1) {
unsigned long cur = trans->delayed_ref_updates;
trans->delayed_ref_updates = 0;
if (cur &&
......@@ -649,6 +652,7 @@ static int __btrfs_end_transaction(struct btrfs_trans_handle *trans,
}
count++;
}
btrfs_trans_release_metadata(trans, root);
trans->block_rsv = NULL;
......@@ -744,7 +748,9 @@ int btrfs_write_marked_extents(struct btrfs_root *root,
struct extent_state *cached_state = NULL;
u64 start = 0;
u64 end;
struct blk_plug plug;
blk_start_plug(&plug);
while (!find_first_extent_bit(dirty_pages, start, &start, &end,
mark, &cached_state)) {
convert_extent_bit(dirty_pages, start, end, EXTENT_NEED_WAIT,
......@@ -758,6 +764,7 @@ int btrfs_write_marked_extents(struct btrfs_root *root,
}
if (err)
werr = err;
blk_finish_plug(&plug);
return werr;
}
......
fs/btrfs/volumes.c
浏览文件 @ e942f883
......@@ -25,6 +25,8 @@
#include <linux/capability.h>
#include <linux/ratelimit.h>
#include <linux/kthread.h>
#include <linux/raid/pq.h>
#include <asm/div64.h>
#include "compat.h"
#include "ctree.h"
#include "extent_map.h"
......@@ -32,6 +34,7 @@
#include "transaction.h"
#include "print-tree.h"
#include "volumes.h"
#include "raid56.h"
#include "async-thread.h"
#include "check-integrity.h"
#include "rcu-string.h"
......@@ -1465,6 +1468,21 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path)
goto out;
}
if ((all_avail & BTRFS_BLOCK_GROUP_RAID5) &&
root->fs_info->fs_devices->rw_devices <= 2) {
printk(KERN_ERR "btrfs: unable to go below two "
"devices on raid5\n");
ret = -EINVAL;
goto out;
}
if ((all_avail & BTRFS_BLOCK_GROUP_RAID6) &&
root->fs_info->fs_devices->rw_devices <= 3) {
printk(KERN_ERR "btrfs: unable to go below three "
"devices on raid6\n");
ret = -EINVAL;
goto out;
}
if (strcmp(device_path, "missing") == 0) {
struct list_head *devices;
struct btrfs_device *tmp;
......@@ -2726,11 +2744,15 @@ static int chunk_drange_filter(struct extent_buffer *leaf,
return 0;
if (btrfs_chunk_type(leaf, chunk) & (BTRFS_BLOCK_GROUP_DUP |
BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10))
factor = 2;
else
factor = 1;
factor = num_stripes / factor;
BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10)) {
factor = num_stripes / 2;
} else if (btrfs_chunk_type(leaf, chunk) & BTRFS_BLOCK_GROUP_RAID5) {
factor = num_stripes - 1;
} else if (btrfs_chunk_type(leaf, chunk) & BTRFS_BLOCK_GROUP_RAID6) {
factor = num_stripes - 2;
} else {
factor = num_stripes;
}
for (i = 0; i < num_stripes; i++) {
stripe = btrfs_stripe_nr(chunk, i);
......@@ -3090,7 +3112,9 @@ int btrfs_balance(struct btrfs_balance_control *bctl,
allowed |= (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1);
else
allowed |= (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 |
BTRFS_BLOCK_GROUP_RAID10);
BTRFS_BLOCK_GROUP_RAID10 |
BTRFS_BLOCK_GROUP_RAID5 |
BTRFS_BLOCK_GROUP_RAID6);
if ((bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) &&
(!alloc_profile_is_valid(bctl->data.target, 1) ||
......@@ -3130,7 +3154,9 @@ int btrfs_balance(struct btrfs_balance_control *bctl,
/* allow to reduce meta or sys integrity only if force set */
allowed = BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1 |
BTRFS_BLOCK_GROUP_RAID10;
BTRFS_BLOCK_GROUP_RAID10 |
BTRFS_BLOCK_GROUP_RAID5 |
BTRFS_BLOCK_GROUP_RAID6;
do {
seq = read_seqbegin(&fs_info->profiles_lock);
......@@ -3204,11 +3230,6 @@ int btrfs_balance(struct btrfs_balance_control *bctl,
update_ioctl_balance_args(fs_info, 0, bargs);
}
if ((ret && ret != -ECANCELED && ret != -ENOSPC) ||
balance_need_close(fs_info)) {
__cancel_balance(fs_info);
}
wake_up(&fs_info->balance_wait_q);
return ret;
......@@ -3611,8 +3632,46 @@ struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES] = {
.devs_increment = 1,
.ncopies = 1,
},
[BTRFS_RAID_RAID5] = {
.sub_stripes = 1,
.dev_stripes = 1,
.devs_max = 0,
.devs_min = 2,
.devs_increment = 1,
.ncopies = 2,
},
[BTRFS_RAID_RAID6] = {
.sub_stripes = 1,
.dev_stripes = 1,
.devs_max = 0,
.devs_min = 3,
.devs_increment = 1,
.ncopies = 3,
},
};
static u32 find_raid56_stripe_len(u32 data_devices, u32 dev_stripe_target)
{
/* TODO allow them to set a preferred stripe size */
return 64 * 1024;
}
static void check_raid56_incompat_flag(struct btrfs_fs_info *info, u64 type)
{
u64 features;
if (!(type & (BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6)))
return;
features = btrfs_super_incompat_flags(info->super_copy);
if (features & BTRFS_FEATURE_INCOMPAT_RAID56)
return;
features |= BTRFS_FEATURE_INCOMPAT_RAID56;
btrfs_set_super_incompat_flags(info->super_copy, features);
printk(KERN_INFO "btrfs: setting RAID5/6 feature flag\n");
}
static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
struct btrfs_root *extent_root,
struct map_lookup **map_ret,
......@@ -3628,6 +3687,8 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
struct btrfs_device_info *devices_info = NULL;
u64 total_avail;
int num_stripes; /* total number of stripes to allocate */
int data_stripes; /* number of stripes that count for
block group size */
int sub_stripes; /* sub_stripes info for map */
int dev_stripes; /* stripes per dev */
int devs_max; /* max devs to use */
......@@ -3639,6 +3700,7 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
u64 max_chunk_size;
u64 stripe_size;
u64 num_bytes;
u64 raid_stripe_len = BTRFS_STRIPE_LEN;
int ndevs;
int i;
int j;
......@@ -3768,16 +3830,31 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
stripe_size = devices_info[ndevs-1].max_avail;
num_stripes = ndevs * dev_stripes;
/*
* this will have to be fixed for RAID1 and RAID10 over
* more drives
*/
data_stripes = num_stripes / ncopies;
if (stripe_size * ndevs > max_chunk_size * ncopies) {
stripe_size = max_chunk_size * ncopies;
do_div(stripe_size, ndevs);
}
if (type & BTRFS_BLOCK_GROUP_RAID5) {
raid_stripe_len = find_raid56_stripe_len(ndevs - 1,
btrfs_super_stripesize(info->super_copy));
data_stripes = num_stripes - 1;
}
if (type & BTRFS_BLOCK_GROUP_RAID6) {
raid_stripe_len = find_raid56_stripe_len(ndevs - 2,
btrfs_super_stripesize(info->super_copy));
data_stripes = num_stripes - 2;
}
do_div(stripe_size, dev_stripes);
/* align to BTRFS_STRIPE_LEN */
do_div(stripe_size, BTRFS_STRIPE_LEN);
stripe_size *= BTRFS_STRIPE_LEN;
do_div(stripe_size, raid_stripe_len);
stripe_size *= raid_stripe_len;
map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS);
if (!map) {
......@@ -3795,14 +3872,14 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
}
}
map->sector_size = extent_root->sectorsize;
map->stripe_len = BTRFS_STRIPE_LEN;
map->io_align = BTRFS_STRIPE_LEN;
map->io_width = BTRFS_STRIPE_LEN;
map->stripe_len = raid_stripe_len;
map->io_align = raid_stripe_len;
map->io_width = raid_stripe_len;
map->type = type;
map->sub_stripes = sub_stripes;
*map_ret = map;
num_bytes = stripe_size * (num_stripes / ncopies);
num_bytes = stripe_size * data_stripes;
*stripe_size_out = stripe_size;
*num_bytes_out = num_bytes;
......@@ -3853,6 +3930,8 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
}
free_extent_map(em);
check_raid56_incompat_flag(extent_root->fs_info, type);
kfree(devices_info);
return 0;
......@@ -4136,6 +4215,10 @@ int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len)
ret = map->num_stripes;
else if (map->type & BTRFS_BLOCK_GROUP_RAID10)
ret = map->sub_stripes;
else if (map->type & BTRFS_BLOCK_GROUP_RAID5)
ret = 2;
else if (map->type & BTRFS_BLOCK_GROUP_RAID6)
ret = 3;
else
ret = 1;
free_extent_map(em);
......@@ -4148,6 +4231,52 @@ int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len)
return ret;
}
unsigned long btrfs_full_stripe_len(struct btrfs_root *root,
struct btrfs_mapping_tree *map_tree,
u64 logical)
{
struct extent_map *em;
struct map_lookup *map;
struct extent_map_tree *em_tree = &map_tree->map_tree;
unsigned long len = root->sectorsize;
read_lock(&em_tree->lock);
em = lookup_extent_mapping(em_tree, logical, len);
read_unlock(&em_tree->lock);
BUG_ON(!em);
BUG_ON(em->start > logical || em->start + em->len < logical);
map = (struct map_lookup *)em->bdev;
if (map->type & (BTRFS_BLOCK_GROUP_RAID5 |
BTRFS_BLOCK_GROUP_RAID6)) {
len = map->stripe_len * nr_data_stripes(map);
}
free_extent_map(em);
return len;
}
int btrfs_is_parity_mirror(struct btrfs_mapping_tree *map_tree,
u64 logical, u64 len, int mirror_num)
{
struct extent_map *em;
struct map_lookup *map;
struct extent_map_tree *em_tree = &map_tree->map_tree;
int ret = 0;
read_lock(&em_tree->lock);
em = lookup_extent_mapping(em_tree, logical, len);
read_unlock(&em_tree->lock);
BUG_ON(!em);
BUG_ON(em->start > logical || em->start + em->len < logical);
map = (struct map_lookup *)em->bdev;
if (map->type & (BTRFS_BLOCK_GROUP_RAID5 |
BTRFS_BLOCK_GROUP_RAID6))
ret = 1;
free_extent_map(em);
return ret;
}
static int find_live_mirror(struct btrfs_fs_info *fs_info,
struct map_lookup *map, int first, int num,
int optimal, int dev_replace_is_ongoing)
......@@ -4185,10 +4314,39 @@ static int find_live_mirror(struct btrfs_fs_info *fs_info,
return optimal;
}
static inline int parity_smaller(u64 a, u64 b)
{
return a > b;
}
/* Bubble-sort the stripe set to put the parity/syndrome stripes last */
static void sort_parity_stripes(struct btrfs_bio *bbio, u64 *raid_map)
{
struct btrfs_bio_stripe s;
int i;
u64 l;
int again = 1;
while (again) {
again = 0;
for (i = 0; i < bbio->num_stripes - 1; i++) {
if (parity_smaller(raid_map[i], raid_map[i+1])) {
s = bbio->stripes[i];
l = raid_map[i];
bbio->stripes[i] = bbio->stripes[i+1];
raid_map[i] = raid_map[i+1];
bbio->stripes[i+1] = s;
raid_map[i+1] = l;
again = 1;
}
}
}
}
static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
u64 logical, u64 *length,
struct btrfs_bio **bbio_ret,
int mirror_num)
int mirror_num, u64 **raid_map_ret)
{
struct extent_map *em;
struct map_lookup *map;
......@@ -4200,6 +4358,8 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
u64 stripe_nr;
u64 stripe_nr_orig;
u64 stripe_nr_end;
u64 stripe_len;
u64 *raid_map = NULL;
int stripe_index;
int i;
int ret = 0;
......@@ -4211,6 +4371,7 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
int num_alloc_stripes;
int patch_the_first_stripe_for_dev_replace = 0;
u64 physical_to_patch_in_first_stripe = 0;
u64 raid56_full_stripe_start = (u64)-1;
read_lock(&em_tree->lock);
em = lookup_extent_mapping(em_tree, logical, *length);
......@@ -4227,29 +4388,63 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
map = (struct map_lookup *)em->bdev;
offset = logical - em->start;
if (mirror_num > map->num_stripes)
mirror_num = 0;
stripe_len = map->stripe_len;
stripe_nr = offset;
/*
* stripe_nr counts the total number of stripes we have to stride
* to get to this block
*/
do_div(stripe_nr, map->stripe_len);
do_div(stripe_nr, stripe_len);
stripe_offset = stripe_nr * map->stripe_len;
stripe_offset = stripe_nr * stripe_len;
BUG_ON(offset < stripe_offset);
/* stripe_offset is the offset of this block in its stripe*/
stripe_offset = offset - stripe_offset;
if (rw & REQ_DISCARD)
/* if we're here for raid56, we need to know the stripe aligned start */
if (map->type & (BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6)) {
unsigned long full_stripe_len = stripe_len * nr_data_stripes(map);
raid56_full_stripe_start = offset;
/* allow a write of a full stripe, but make sure we don't
* allow straddling of stripes
*/
do_div(raid56_full_stripe_start, full_stripe_len);
raid56_full_stripe_start *= full_stripe_len;
}
if (rw & REQ_DISCARD) {
/* we don't discard raid56 yet */
if (map->type &
(BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6)) {
ret = -EOPNOTSUPP;
goto out;
}
*length = min_t(u64, em->len - offset, *length);
else if (map->type & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
/* we limit the length of each bio to what fits in a stripe */
*length = min_t(u64, em->len - offset,
map->stripe_len - stripe_offset);
} else if (map->type & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
u64 max_len;
/* For writes to RAID[56], allow a full stripeset across all disks.
For other RAID types and for RAID[56] reads, just allow a single
stripe (on a single disk). */
if (map->type & (BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6) &&
(rw & REQ_WRITE)) {
max_len = stripe_len * nr_data_stripes(map) -
(offset - raid56_full_stripe_start);
} else {
/* we limit the length of each bio to what fits in a stripe */
max_len = stripe_len - stripe_offset;
}
*length = min_t(u64, em->len - offset, max_len);
} else {
*length = em->len - offset;
}
/* This is for when we're called from btrfs_merge_bio_hook() and all
it cares about is the length */
if (!bbio_ret)
goto out;
......@@ -4282,7 +4477,7 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
u64 physical_of_found = 0;
ret = __btrfs_map_block(fs_info, REQ_GET_READ_MIRRORS,
logical, &tmp_length, &tmp_bbio, 0);
logical, &tmp_length, &tmp_bbio, 0, NULL);
if (ret) {
WARN_ON(tmp_bbio != NULL);
goto out;
......@@ -4348,6 +4543,7 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
do_div(stripe_nr_end, map->stripe_len);
stripe_end_offset = stripe_nr_end * map->stripe_len -
(offset + *length);
if (map->type & BTRFS_BLOCK_GROUP_RAID0) {
if (rw & REQ_DISCARD)
num_stripes = min_t(u64, map->num_stripes,
......@@ -4398,6 +4594,65 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
dev_replace_is_ongoing);
mirror_num = stripe_index - old_stripe_index + 1;
}
} else if (map->type & (BTRFS_BLOCK_GROUP_RAID5 |
BTRFS_BLOCK_GROUP_RAID6)) {
u64 tmp;
if (bbio_ret && ((rw & REQ_WRITE) || mirror_num > 1)
&& raid_map_ret) {
int i, rot;
/* push stripe_nr back to the start of the full stripe */
stripe_nr = raid56_full_stripe_start;
do_div(stripe_nr, stripe_len);
stripe_index = do_div(stripe_nr, nr_data_stripes(map));
/* RAID[56] write or recovery. Return all stripes */
num_stripes = map->num_stripes;
max_errors = nr_parity_stripes(map);
raid_map = kmalloc(sizeof(u64) * num_stripes,
GFP_NOFS);
if (!raid_map) {
ret = -ENOMEM;
goto out;
}
/* Work out the disk rotation on this stripe-set */
tmp = stripe_nr;
rot = do_div(tmp, num_stripes);
/* Fill in the logical address of each stripe */
tmp = stripe_nr * nr_data_stripes(map);
for (i = 0; i < nr_data_stripes(map); i++)
raid_map[(i+rot) % num_stripes] =
em->start + (tmp + i) * map->stripe_len;
raid_map[(i+rot) % map->num_stripes] = RAID5_P_STRIPE;
if (map->type & BTRFS_BLOCK_GROUP_RAID6)
raid_map[(i+rot+1) % num_stripes] =
RAID6_Q_STRIPE;
*length = map->stripe_len;
stripe_index = 0;
stripe_offset = 0;
} else {
/*
* Mirror #0 or #1 means the original data block.
* Mirror #2 is RAID5 parity block.
* Mirror #3 is RAID6 Q block.
*/
stripe_index = do_div(stripe_nr, nr_data_stripes(map));
if (mirror_num > 1)
stripe_index = nr_data_stripes(map) +
mirror_num - 2;
/* We distribute the parity blocks across stripes */
tmp = stripe_nr + stripe_index;
stripe_index = do_div(tmp, map->num_stripes);
}
} else {
/*
* after this do_div call, stripe_nr is the number of stripes
......@@ -4506,8 +4761,11 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
if (rw & (REQ_WRITE | REQ_GET_READ_MIRRORS)) {
if (map->type & (BTRFS_BLOCK_GROUP_RAID1 |
BTRFS_BLOCK_GROUP_RAID10 |
BTRFS_BLOCK_GROUP_RAID5 |
BTRFS_BLOCK_GROUP_DUP)) {
max_errors = 1;
} else if (map->type & BTRFS_BLOCK_GROUP_RAID6) {
max_errors = 2;
}
}
......@@ -4608,6 +4866,10 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
bbio->stripes[0].physical = physical_to_patch_in_first_stripe;
bbio->mirror_num = map->num_stripes + 1;
}
if (raid_map) {
sort_parity_stripes(bbio, raid_map);
*raid_map_ret = raid_map;
}
out:
if (dev_replace_is_ongoing)
btrfs_dev_replace_unlock(dev_replace);
......@@ -4620,7 +4882,7 @@ int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
struct btrfs_bio **bbio_ret, int mirror_num)
{
return __btrfs_map_block(fs_info, rw, logical, length, bbio_ret,
mirror_num);
mirror_num, NULL);
}
int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
......@@ -4634,6 +4896,7 @@ int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
u64 bytenr;
u64 length;
u64 stripe_nr;
u64 rmap_len;
int i, j, nr = 0;
read_lock(&em_tree->lock);
......@@ -4644,10 +4907,17 @@ int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
map = (struct map_lookup *)em->bdev;
length = em->len;
rmap_len = map->stripe_len;
if (map->type & BTRFS_BLOCK_GROUP_RAID10)
do_div(length, map->num_stripes / map->sub_stripes);
else if (map->type & BTRFS_BLOCK_GROUP_RAID0)
do_div(length, map->num_stripes);
else if (map->type & (BTRFS_BLOCK_GROUP_RAID5 |
BTRFS_BLOCK_GROUP_RAID6)) {
do_div(length, nr_data_stripes(map));
rmap_len = map->stripe_len * nr_data_stripes(map);
}
buf = kzalloc(sizeof(u64) * map->num_stripes, GFP_NOFS);
BUG_ON(!buf); /* -ENOMEM */
......@@ -4667,8 +4937,11 @@ int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
do_div(stripe_nr, map->sub_stripes);
} else if (map->type & BTRFS_BLOCK_GROUP_RAID0) {
stripe_nr = stripe_nr * map->num_stripes + i;
}
bytenr = chunk_start + stripe_nr * map->stripe_len;
} /* else if RAID[56], multiply by nr_data_stripes().
* Alternatively, just use rmap_len below instead of
* map->stripe_len */
bytenr = chunk_start + stripe_nr * rmap_len;
WARN_ON(nr >= map->num_stripes);
for (j = 0; j < nr; j++) {
if (buf[j] == bytenr)
......@@ -4682,7 +4955,7 @@ int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
*logical = buf;
*naddrs = nr;
*stripe_len = map->stripe_len;
*stripe_len = rmap_len;
free_extent_map(em);
return 0;
......@@ -4756,7 +5029,7 @@ static void btrfs_end_bio(struct bio *bio, int err)
bio->bi_bdev = (struct block_device *)
(unsigned long)bbio->mirror_num;
/* only send an error to the higher layers if it is
* beyond the tolerance of the multi-bio
* beyond the tolerance of the btrfs bio
*/
if (atomic_read(&bbio->error) > bbio->max_errors) {
err = -EIO;
......@@ -4790,13 +5063,18 @@ struct async_sched {
* This will add one bio to the pending list for a device and make sure
* the work struct is scheduled.
*/
static noinline void schedule_bio(struct btrfs_root *root,
noinline void btrfs_schedule_bio(struct btrfs_root *root,
struct btrfs_device *device,
int rw, struct bio *bio)
{
int should_queue = 1;
struct btrfs_pending_bios *pending_bios;
if (device->missing || !device->bdev) {
bio_endio(bio, -EIO);
return;
}
/* don't bother with additional async steps for reads, right now */
if (!(rw & REQ_WRITE)) {
bio_get(bio);
......@@ -4894,7 +5172,7 @@ static void submit_stripe_bio(struct btrfs_root *root, struct btrfs_bio *bbio,
#endif
bio->bi_bdev = dev->bdev;
if (async)
schedule_bio(root, dev, rw, bio);
btrfs_schedule_bio(root, dev, rw, bio);
else
btrfsic_submit_bio(rw, bio);
}
......@@ -4953,6 +5231,7 @@ int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
u64 logical = (u64)bio->bi_sector << 9;
u64 length = 0;
u64 map_length;
u64 *raid_map = NULL;
int ret;
int dev_nr = 0;
int total_devs = 1;
......@@ -4961,12 +5240,30 @@ int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
length = bio->bi_size;
map_length = length;
ret = btrfs_map_block(root->fs_info, rw, logical, &map_length, &bbio,
mirror_num);
if (ret)
ret = __btrfs_map_block(root->fs_info, rw, logical, &map_length, &bbio,
mirror_num, &raid_map);
if (ret) /* -ENOMEM */
return ret;
total_devs = bbio->num_stripes;
bbio->orig_bio = first_bio;
bbio->private = first_bio->bi_private;
bbio->end_io = first_bio->bi_end_io;
atomic_set(&bbio->stripes_pending, bbio->num_stripes);
if (raid_map) {
/* In this case, map_length has been set to the length of
a single stripe; not the whole write */
if (rw & WRITE) {
return raid56_parity_write(root, bio, bbio,
raid_map, map_length);
} else {
return raid56_parity_recover(root, bio, bbio,
raid_map, map_length,
mirror_num);
}
}
if (map_length < length) {
printk(KERN_CRIT "btrfs: mapping failed logical %llu bio len %llu "
"len %llu\n", (unsigned long long)logical,
......@@ -4975,11 +5272,6 @@ int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
BUG();
}
bbio->orig_bio = first_bio;
bbio->private = first_bio->bi_private;
bbio->end_io = first_bio->bi_end_io;
atomic_set(&bbio->stripes_pending, bbio->num_stripes);
while (dev_nr < total_devs) {
dev = bbio->stripes[dev_nr].dev;
if (!dev || !dev->bdev || (rw & WRITE && !dev->writeable)) {
......
fs/btrfs/volumes.h
浏览文件 @ e942f883
......@@ -321,7 +321,14 @@ void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info,
struct btrfs_device *tgtdev);
int btrfs_scratch_superblock(struct btrfs_device *device);
void btrfs_schedule_bio(struct btrfs_root *root,
struct btrfs_device *device,
int rw, struct bio *bio);
int btrfs_is_parity_mirror(struct btrfs_mapping_tree *map_tree,
u64 logical, u64 len, int mirror_num);
unsigned long btrfs_full_stripe_len(struct btrfs_root *root,
struct btrfs_mapping_tree *map_tree,
u64 logical);
static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
int index)
{
......
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