From 6e9606d2a2dce098c1739fb3cd82a1c34fd73d3a Mon Sep 17 00:00:00 2001
From: Zhao Lei <zhaolei@cn.fujitsu.com>
Date: Tue, 20 Jan 2015 15:11:34 +0800
Subject: [PATCH] Btrfs: add ref_count and free function for btrfs_bio
1: ref_count is simple than current RBIO_HOLD_BBIO_MAP_BIT flag
to keep btrfs_bio's memory in raid56 recovery implement.
2: free function for bbio will make code clean and flexible, plus
forced data type checking in compile.
Changelog v1->v2:
Rename following by David Sterba's suggestion:
put_btrfs_bio() -> btrfs_put_bio()
get_btrfs_bio() -> btrfs_get_bio()
bbio->ref_count -> bbio->refs
Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
---
fs/btrfs/extent-tree.c | 2 +-
fs/btrfs/extent_io.c | 2 +-
fs/btrfs/raid56.c | 38 ++++++++-----------------------------
fs/btrfs/reada.c | 4 ++--
fs/btrfs/scrub.c | 12 ++++++------
fs/btrfs/volumes.c | 43 +++++++++++++++++++++++++++++++++++-------
fs/btrfs/volumes.h | 10 +++-------
7 files changed, 57 insertions(+), 54 deletions(-)
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 3af53f8313af..1d361ac9abc9 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -1926,7 +1926,7 @@ int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr,
*/
ret = 0;
}
- kfree(bbio);
+ btrfs_put_bbio(bbio);
}
if (actual_bytes)
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 65bd285ef361..dab8af4450e1 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2058,7 +2058,7 @@ int repair_io_failure(struct inode *inode, u64 start, u64 length, u64 logical,
sector = bbio->stripes[mirror_num-1].physical >> 9;
bio->bi_iter.bi_sector = sector;
dev = bbio->stripes[mirror_num-1].dev;
- kfree(bbio);
+ btrfs_put_bbio(bbio);
if (!dev || !dev->bdev || !dev->writeable) {
bio_put(bio);
return -EIO;
diff --git a/fs/btrfs/raid56.c b/fs/btrfs/raid56.c
index e301d3302edf..cbc416204452 100644
--- a/fs/btrfs/raid56.c
+++ b/fs/btrfs/raid56.c
@@ -58,15 +58,6 @@
*/
#define RBIO_CACHE_READY_BIT 3
-/*
- * bbio and raid_map is managed by the caller, so we shouldn't free
- * them here. And besides that, all rbios with this flag should not
- * be cached, because we need raid_map to check the rbios' stripe
- * is the same or not, but it is very likely that the caller has
- * free raid_map, so don't cache those rbios.
- */
-#define RBIO_HOLD_BBIO_MAP_BIT 4
-
#define RBIO_CACHE_SIZE 1024
enum btrfs_rbio_ops {
@@ -834,19 +825,6 @@ done_nolock:
remove_rbio_from_cache(rbio);
}
-static inline void
-__free_bbio(struct btrfs_bio *bbio, int need)
-{
- if (need)
- kfree(bbio);
-}
-
-static inline void free_bbio(struct btrfs_raid_bio *rbio)
-{
- __free_bbio(rbio->bbio,
- !test_bit(RBIO_HOLD_BBIO_MAP_BIT, &rbio->flags));
-}
-
static void __free_raid_bio(struct btrfs_raid_bio *rbio)
{
int i;
@@ -866,8 +844,7 @@ static void __free_raid_bio(struct btrfs_raid_bio *rbio)
}
}
- free_bbio(rbio);
-
+ btrfs_put_bbio(rbio->bbio);
kfree(rbio);
}
@@ -1774,7 +1751,7 @@ int raid56_parity_write(struct btrfs_root *root, struct bio *bio,
rbio = alloc_rbio(root, bbio, stripe_len);
if (IS_ERR(rbio)) {
- __free_bbio(bbio, 1);
+ btrfs_put_bbio(bbio);
return PTR_ERR(rbio);
}
bio_list_add(&rbio->bio_list, bio);
@@ -1990,8 +1967,7 @@ cleanup:
cleanup_io:
if (rbio->operation == BTRFS_RBIO_READ_REBUILD) {
- if (err == 0 &&
- !test_bit(RBIO_HOLD_BBIO_MAP_BIT, &rbio->flags))
+ if (err == 0)
cache_rbio_pages(rbio);
else
clear_bit(RBIO_CACHE_READY_BIT, &rbio->flags);
@@ -2153,7 +2129,8 @@ int raid56_parity_recover(struct btrfs_root *root, struct bio *bio,
rbio = alloc_rbio(root, bbio, stripe_len);
if (IS_ERR(rbio)) {
- __free_bbio(bbio, generic_io);
+ if (generic_io)
+ btrfs_put_bbio(bbio);
return PTR_ERR(rbio);
}
@@ -2164,7 +2141,8 @@ int raid56_parity_recover(struct btrfs_root *root, struct bio *bio,
rbio->faila = find_logical_bio_stripe(rbio, bio);
if (rbio->faila == -1) {
BUG();
- __free_bbio(bbio, generic_io);
+ if (generic_io)
+ btrfs_put_bbio(bbio);
kfree(rbio);
return -EIO;
}
@@ -2173,7 +2151,7 @@ int raid56_parity_recover(struct btrfs_root *root, struct bio *bio,
btrfs_bio_counter_inc_noblocked(root->fs_info);
rbio->generic_bio_cnt = 1;
} else {
- set_bit(RBIO_HOLD_BBIO_MAP_BIT, &rbio->flags);
+ btrfs_get_bbio(bbio);
}
/*
diff --git a/fs/btrfs/reada.c b/fs/btrfs/reada.c
index 4d3d4e5287c5..0e7beea92b4c 100644
--- a/fs/btrfs/reada.c
+++ b/fs/btrfs/reada.c
@@ -461,7 +461,7 @@ static struct reada_extent *reada_find_extent(struct btrfs_root *root,
spin_unlock(&fs_info->reada_lock);
btrfs_dev_replace_unlock(&fs_info->dev_replace);
- kfree(bbio);
+ btrfs_put_bbio(bbio);
return re;
error:
@@ -486,7 +486,7 @@ error:
kref_put(&zone->refcnt, reada_zone_release);
spin_unlock(&fs_info->reada_lock);
}
- kfree(bbio);
+ btrfs_put_bbio(bbio);
kfree(re);
return re_exist;
}
diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index 9d07c981ec82..1388e7127eea 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -855,7 +855,7 @@ static inline void scrub_get_recover(struct scrub_recover *recover)
static inline void scrub_put_recover(struct scrub_recover *recover)
{
if (atomic_dec_and_test(&recover->refs)) {
- kfree(recover->bbio);
+ btrfs_put_bbio(recover->bbio);
kfree(recover);
}
}
@@ -1373,13 +1373,13 @@ static int scrub_setup_recheck_block(struct scrub_ctx *sctx,
ret = btrfs_map_sblock(fs_info, REQ_GET_READ_MIRRORS, logical,
&mapped_length, &bbio, 0, 1);
if (ret || !bbio || mapped_length < sublen) {
- kfree(bbio);
+ btrfs_put_bbio(bbio);
return -EIO;
}
recover = kzalloc(sizeof(struct scrub_recover), GFP_NOFS);
if (!recover) {
- kfree(bbio);
+ btrfs_put_bbio(bbio);
return -ENOMEM;
}
@@ -2748,7 +2748,7 @@ static void scrub_parity_check_and_repair(struct scrub_parity *sparity)
rbio_out:
bio_put(bio);
bbio_out:
- kfree(bbio);
+ btrfs_put_bbio(bbio);
bitmap_or(sparity->ebitmap, sparity->ebitmap, sparity->dbitmap,
sparity->nsectors);
spin_lock(&sctx->stat_lock);
@@ -3879,14 +3879,14 @@ static void scrub_remap_extent(struct btrfs_fs_info *fs_info,
&mapped_length, &bbio, 0);
if (ret || !bbio || mapped_length < extent_len ||
!bbio->stripes[0].dev->bdev) {
- kfree(bbio);
+ btrfs_put_bbio(bbio);
return;
}
*extent_physical = bbio->stripes[0].physical;
*extent_mirror_num = bbio->mirror_num;
*extent_dev = bbio->stripes[0].dev;
- kfree(bbio);
+ btrfs_put_bbio(bbio);
}
static int scrub_setup_wr_ctx(struct scrub_ctx *sctx,
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index c0f1d524c371..0843bcd6304c 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -4901,6 +4901,37 @@ static void sort_parity_stripes(struct btrfs_bio *bbio, int num_stripes)
}
}
+static struct btrfs_bio *alloc_btrfs_bio(int total_stripes, int real_stripes)
+{
+ struct btrfs_bio *bbio = kzalloc(
+ sizeof(struct btrfs_bio) +
+ sizeof(struct btrfs_bio_stripe) * (total_stripes) +
+ sizeof(int) * (real_stripes) +
+ sizeof(u64) * (real_stripes),
+ GFP_NOFS);
+ if (!bbio)
+ return NULL;
+
+ atomic_set(&bbio->error, 0);
+ atomic_set(&bbio->refs, 1);
+
+ return bbio;
+}
+
+void btrfs_get_bbio(struct btrfs_bio *bbio)
+{
+ WARN_ON(!atomic_read(&bbio->refs));
+ atomic_inc(&bbio->refs);
+}
+
+void btrfs_put_bbio(struct btrfs_bio *bbio)
+{
+ if (!bbio)
+ return;
+ if (atomic_dec_and_test(&bbio->refs))
+ kfree(bbio);
+}
+
static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
u64 logical, u64 *length,
struct btrfs_bio **bbio_ret,
@@ -5052,7 +5083,7 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
* is not left of the left cursor
*/
ret = -EIO;
- kfree(tmp_bbio);
+ btrfs_put_bbio(tmp_bbio);
goto out;
}
@@ -5087,11 +5118,11 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
} else {
WARN_ON(1);
ret = -EIO;
- kfree(tmp_bbio);
+ btrfs_put_bbio(tmp_bbio);
goto out;
}
- kfree(tmp_bbio);
+ btrfs_put_bbio(tmp_bbio);
} else if (mirror_num > map->num_stripes) {
mirror_num = 0;
}
@@ -5213,13 +5244,11 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
tgtdev_indexes = num_stripes;
}
- bbio = kzalloc(btrfs_bio_size(num_alloc_stripes, tgtdev_indexes),
- GFP_NOFS);
+ bbio = alloc_btrfs_bio(num_alloc_stripes, tgtdev_indexes);
if (!bbio) {
ret = -ENOMEM;
goto out;
}
- atomic_set(&bbio->error, 0);
if (dev_replace_is_ongoing)
bbio->tgtdev_map = (int *)(bbio->stripes + num_alloc_stripes);
@@ -5558,7 +5587,7 @@ static inline void btrfs_end_bbio(struct btrfs_bio *bbio, struct bio *bio, int e
bio_endio_nodec(bio, err);
else
bio_endio(bio, err);
- kfree(bbio);
+ btrfs_put_bbio(bbio);
}
static void btrfs_end_bio(struct bio *bio, int err)
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index fb0e8c3f296e..4313e8ff91e5 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -295,6 +295,7 @@ typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err);
#define BTRFS_BIO_ORIG_BIO_SUBMITTED (1 << 0)
struct btrfs_bio {
+ atomic_t refs;
atomic_t stripes_pending;
struct btrfs_fs_info *fs_info;
bio_end_io_t *end_io;
@@ -394,13 +395,8 @@ struct btrfs_balance_control {
int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
u64 end, u64 *length);
-
-#define btrfs_bio_size(total_stripes, real_stripes) \
- (sizeof(struct btrfs_bio) + \
- (sizeof(struct btrfs_bio_stripe) * (total_stripes)) + \
- (sizeof(int) * (real_stripes)) + \
- (sizeof(u64) * (real_stripes)))
-
+void btrfs_get_bbio(struct btrfs_bio *bbio);
+void btrfs_put_bbio(struct btrfs_bio *bbio);
int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
u64 logical, u64 *length,
struct btrfs_bio **bbio_ret, int mirror_num);
--
2.20.1