* [PATCH 1/2] btrfs: make sure btrfs_io_context::fs_info is always initialized
@ 2021-09-23 6:00 Qu Wenruo
2021-09-23 6:00 ` [PATCH 2/2] btrfs: remove btrfs_raid_bio::fs_info member Qu Wenruo
` (2 more replies)
0 siblings, 3 replies; 5+ messages in thread
From: Qu Wenruo @ 2021-09-23 6:00 UTC (permalink / raw)
To: linux-btrfs
Currently btrfs_io_context::fs_info is only initialized in
btrfs_map_block(), but there are call sites like btrfs_map_sblock()
which calls __btrfs_map_block() directly, leaving bioc::fs_info
uninitialized (NULL).
Currently this is fine, but later cleanup will rely on bioc::fs_info to
grab fs_info, and this can be a hidden problem for such usage.
This patch will remove such hidden uninitialized member by always
assigning bioc::fs_info at alloc_btrfs_io_context().
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/volumes.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index d7cc24ed9620..89c802f8b35b 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -5807,7 +5807,8 @@ static void sort_parity_stripes(struct btrfs_io_context *bioc, int num_stripes)
}
}
-static struct btrfs_io_context *alloc_btrfs_io_context(int total_stripes,
+static struct btrfs_io_context *alloc_btrfs_io_context(struct btrfs_fs_info *fs_info,
+ int total_stripes,
int real_stripes)
{
struct btrfs_io_context *bioc = kzalloc(
@@ -5827,6 +5828,7 @@ static struct btrfs_io_context *alloc_btrfs_io_context(int total_stripes,
atomic_set(&bioc->error, 0);
refcount_set(&bioc->refs, 1);
+ bioc->fs_info = fs_info;
bioc->tgtdev_map = (int *)(bioc->stripes + total_stripes);
bioc->raid_map = (u64 *)(bioc->tgtdev_map + real_stripes);
@@ -5941,7 +5943,7 @@ static int __btrfs_map_block_for_discard(struct btrfs_fs_info *fs_info,
&stripe_index);
}
- bioc = alloc_btrfs_io_context(num_stripes, 0);
+ bioc = alloc_btrfs_io_context(fs_info, num_stripes, 0);
if (!bioc) {
ret = -ENOMEM;
goto out;
@@ -6463,7 +6465,8 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
tgtdev_indexes = num_stripes;
}
- bioc = alloc_btrfs_io_context(num_alloc_stripes, tgtdev_indexes);
+ bioc = alloc_btrfs_io_context(fs_info, num_alloc_stripes,
+ tgtdev_indexes);
if (!bioc) {
ret = -ENOMEM;
goto out;
@@ -6699,7 +6702,6 @@ blk_status_t btrfs_map_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
bioc->orig_bio = first_bio;
bioc->private = first_bio->bi_private;
bioc->end_io = first_bio->bi_end_io;
- bioc->fs_info = fs_info;
atomic_set(&bioc->stripes_pending, bioc->num_stripes);
if ((bioc->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK) &&
--
2.33.0
^ permalink raw reply related [flat|nested] 5+ messages in thread
* [PATCH 2/2] btrfs: remove btrfs_raid_bio::fs_info member
2021-09-23 6:00 [PATCH 1/2] btrfs: make sure btrfs_io_context::fs_info is always initialized Qu Wenruo
@ 2021-09-23 6:00 ` Qu Wenruo
2021-09-23 8:53 ` Nikolay Borisov
2021-09-23 8:36 ` [PATCH 1/2] btrfs: make sure btrfs_io_context::fs_info is always initialized Nikolay Borisov
2021-09-23 21:12 ` David Sterba
2 siblings, 1 reply; 5+ messages in thread
From: Qu Wenruo @ 2021-09-23 6:00 UTC (permalink / raw)
To: linux-btrfs
We can grab fs_info reliably from btrfs_raid_bio::bioc, as the bioc is
always passed into alloc_rbio(), and only get released when the raid bio
is released.
This patch will remove btrfs_raid_bio::fs_info member, and cleanup all
the @fs_info parameters for alloc_rbio() callers.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/raid56.c | 48 +++++++++++++++++++++++++---------------------
fs/btrfs/raid56.h | 18 ++++++++---------
fs/btrfs/scrub.c | 8 ++++----
fs/btrfs/volumes.c | 7 +++----
4 files changed, 41 insertions(+), 40 deletions(-)
diff --git a/fs/btrfs/raid56.c b/fs/btrfs/raid56.c
index 02aa3fbb8108..5ea70c7def98 100644
--- a/fs/btrfs/raid56.c
+++ b/fs/btrfs/raid56.c
@@ -60,7 +60,6 @@ enum btrfs_rbio_ops {
};
struct btrfs_raid_bio {
- struct btrfs_fs_info *fs_info;
struct btrfs_io_context *bioc;
/* while we're doing rmw on a stripe
@@ -192,7 +191,7 @@ static void scrub_parity_work(struct btrfs_work *work);
static void start_async_work(struct btrfs_raid_bio *rbio, btrfs_func_t work_func)
{
btrfs_init_work(&rbio->work, work_func, NULL, NULL);
- btrfs_queue_work(rbio->fs_info->rmw_workers, &rbio->work);
+ btrfs_queue_work(rbio->bioc->fs_info->rmw_workers, &rbio->work);
}
/*
@@ -345,7 +344,7 @@ static void __remove_rbio_from_cache(struct btrfs_raid_bio *rbio)
if (!test_bit(RBIO_CACHE_BIT, &rbio->flags))
return;
- table = rbio->fs_info->stripe_hash_table;
+ table = rbio->bioc->fs_info->stripe_hash_table;
h = table->table + bucket;
/* hold the lock for the bucket because we may be
@@ -400,7 +399,7 @@ static void remove_rbio_from_cache(struct btrfs_raid_bio *rbio)
if (!test_bit(RBIO_CACHE_BIT, &rbio->flags))
return;
- table = rbio->fs_info->stripe_hash_table;
+ table = rbio->bioc->fs_info->stripe_hash_table;
spin_lock_irqsave(&table->cache_lock, flags);
__remove_rbio_from_cache(rbio);
@@ -460,7 +459,7 @@ static void cache_rbio(struct btrfs_raid_bio *rbio)
if (!test_bit(RBIO_CACHE_READY_BIT, &rbio->flags))
return;
- table = rbio->fs_info->stripe_hash_table;
+ table = rbio->bioc->fs_info->stripe_hash_table;
spin_lock_irqsave(&table->cache_lock, flags);
spin_lock(&rbio->bio_list_lock);
@@ -668,7 +667,7 @@ static noinline int lock_stripe_add(struct btrfs_raid_bio *rbio)
struct btrfs_raid_bio *cache_drop = NULL;
int ret = 0;
- h = rbio->fs_info->stripe_hash_table->table + rbio_bucket(rbio);
+ h = rbio->bioc->fs_info->stripe_hash_table->table + rbio_bucket(rbio);
spin_lock_irqsave(&h->lock, flags);
list_for_each_entry(cur, &h->hash_list, hash_list) {
@@ -750,7 +749,7 @@ static noinline void unlock_stripe(struct btrfs_raid_bio *rbio)
int keep_cache = 0;
bucket = rbio_bucket(rbio);
- h = rbio->fs_info->stripe_hash_table->table + bucket;
+ h = rbio->bioc->fs_info->stripe_hash_table->table + bucket;
if (list_empty(&rbio->plug_list))
cache_rbio(rbio);
@@ -864,7 +863,8 @@ static void rbio_orig_end_io(struct btrfs_raid_bio *rbio, blk_status_t err)
struct bio *extra;
if (rbio->generic_bio_cnt)
- btrfs_bio_counter_sub(rbio->fs_info, rbio->generic_bio_cnt);
+ btrfs_bio_counter_sub(rbio->bioc->fs_info,
+ rbio->generic_bio_cnt);
/*
* At this moment, rbio->bio_list is empty, however since rbio does not
@@ -987,7 +987,6 @@ static struct btrfs_raid_bio *alloc_rbio(struct btrfs_fs_info *fs_info,
INIT_LIST_HEAD(&rbio->stripe_cache);
INIT_LIST_HEAD(&rbio->hash_list);
rbio->bioc = bioc;
- rbio->fs_info = fs_info;
rbio->stripe_len = stripe_len;
rbio->nr_pages = num_pages;
rbio->real_stripes = real_stripes;
@@ -1546,7 +1545,8 @@ static int raid56_rmw_stripe(struct btrfs_raid_bio *rbio)
bio->bi_end_io = raid_rmw_end_io;
bio->bi_opf = REQ_OP_READ;
- btrfs_bio_wq_end_io(rbio->fs_info, bio, BTRFS_WQ_ENDIO_RAID56);
+ btrfs_bio_wq_end_io(rbio->bioc->fs_info, bio,
+ BTRFS_WQ_ENDIO_RAID56);
submit_bio(bio);
}
@@ -1718,9 +1718,10 @@ static void btrfs_raid_unplug(struct blk_plug_cb *cb, bool from_schedule)
/*
* our main entry point for writes from the rest of the FS.
*/
-int raid56_parity_write(struct btrfs_fs_info *fs_info, struct bio *bio,
- struct btrfs_io_context *bioc, u64 stripe_len)
+int raid56_parity_write(struct bio *bio, struct btrfs_io_context *bioc,
+ u64 stripe_len)
{
+ struct btrfs_fs_info *fs_info = bioc->fs_info;
struct btrfs_raid_bio *rbio;
struct btrfs_plug_cb *plug = NULL;
struct blk_plug_cb *cb;
@@ -2091,7 +2092,8 @@ static int __raid56_parity_recover(struct btrfs_raid_bio *rbio)
bio->bi_end_io = raid_recover_end_io;
bio->bi_opf = REQ_OP_READ;
- btrfs_bio_wq_end_io(rbio->fs_info, bio, BTRFS_WQ_ENDIO_RAID56);
+ btrfs_bio_wq_end_io(rbio->bioc->fs_info, bio,
+ BTRFS_WQ_ENDIO_RAID56);
submit_bio(bio);
}
@@ -2115,10 +2117,10 @@ static int __raid56_parity_recover(struct btrfs_raid_bio *rbio)
* so we assume the bio they send down corresponds to a failed part
* of the drive.
*/
-int raid56_parity_recover(struct btrfs_fs_info *fs_info, struct bio *bio,
- struct btrfs_io_context *bioc, u64 stripe_len,
- int mirror_num, int generic_io)
+int raid56_parity_recover(struct bio *bio, struct btrfs_io_context *bioc,
+ u64 stripe_len, int mirror_num, int generic_io)
{
+ struct btrfs_fs_info *fs_info = bioc->fs_info;
struct btrfs_raid_bio *rbio;
int ret;
@@ -2221,11 +2223,11 @@ static void read_rebuild_work(struct btrfs_work *work)
*/
struct btrfs_raid_bio *
-raid56_parity_alloc_scrub_rbio(struct btrfs_fs_info *fs_info, struct bio *bio,
- struct btrfs_io_context *bioc, u64 stripe_len,
- struct btrfs_device *scrub_dev,
+raid56_parity_alloc_scrub_rbio(struct bio *bio, struct btrfs_io_context *bioc,
+ u64 stripe_len, struct btrfs_device *scrub_dev,
unsigned long *dbitmap, int stripe_nsectors)
{
+ struct btrfs_fs_info *fs_info = bioc->fs_info;
struct btrfs_raid_bio *rbio;
int i;
@@ -2633,7 +2635,8 @@ static void raid56_parity_scrub_stripe(struct btrfs_raid_bio *rbio)
bio->bi_end_io = raid56_parity_scrub_end_io;
bio->bi_opf = REQ_OP_READ;
- btrfs_bio_wq_end_io(rbio->fs_info, bio, BTRFS_WQ_ENDIO_RAID56);
+ btrfs_bio_wq_end_io(rbio->bioc->fs_info, bio,
+ BTRFS_WQ_ENDIO_RAID56);
submit_bio(bio);
}
@@ -2669,9 +2672,10 @@ void raid56_parity_submit_scrub_rbio(struct btrfs_raid_bio *rbio)
/* The following code is used for dev replace of a missing RAID 5/6 device. */
struct btrfs_raid_bio *
-raid56_alloc_missing_rbio(struct btrfs_fs_info *fs_info, struct bio *bio,
- struct btrfs_io_context *bioc, u64 length)
+raid56_alloc_missing_rbio(struct bio *bio, struct btrfs_io_context *bioc,
+ u64 length)
{
+ struct btrfs_fs_info *fs_info = bioc->fs_info;
struct btrfs_raid_bio *rbio;
rbio = alloc_rbio(fs_info, bioc, length);
diff --git a/fs/btrfs/raid56.h b/fs/btrfs/raid56.h
index 838d3a5e07ef..3fd1a0e03993 100644
--- a/fs/btrfs/raid56.h
+++ b/fs/btrfs/raid56.h
@@ -30,25 +30,23 @@ static inline int nr_data_stripes(const struct map_lookup *map)
struct btrfs_raid_bio;
struct btrfs_device;
-int raid56_parity_recover(struct btrfs_fs_info *fs_info, struct bio *bio,
- struct btrfs_io_context *bioc, u64 stripe_len,
- int mirror_num, int generic_io);
-int raid56_parity_write(struct btrfs_fs_info *fs_info, struct bio *bio,
- struct btrfs_io_context *bioc, u64 stripe_len);
+int raid56_parity_recover(struct bio *bio, struct btrfs_io_context *bioc,
+ u64 stripe_len, int mirror_num, int generic_io);
+int raid56_parity_write(struct bio *bio, struct btrfs_io_context *bioc,
+ u64 stripe_len);
void raid56_add_scrub_pages(struct btrfs_raid_bio *rbio, struct page *page,
u64 logical);
struct btrfs_raid_bio *
-raid56_parity_alloc_scrub_rbio(struct btrfs_fs_info *fs_info, struct bio *bio,
- struct btrfs_io_context *bioc, u64 stripe_len,
- struct btrfs_device *scrub_dev,
+raid56_parity_alloc_scrub_rbio(struct bio *bio, struct btrfs_io_context *bioc,
+ u64 stripe_len, struct btrfs_device *scrub_dev,
unsigned long *dbitmap, int stripe_nsectors);
void raid56_parity_submit_scrub_rbio(struct btrfs_raid_bio *rbio);
struct btrfs_raid_bio *
-raid56_alloc_missing_rbio(struct btrfs_fs_info *fs_info, struct bio *bio,
- struct btrfs_io_context *bioc, u64 length);
+raid56_alloc_missing_rbio(struct bio *bio, struct btrfs_io_context *bioc,
+ u64 length);
void raid56_submit_missing_rbio(struct btrfs_raid_bio *rbio);
int btrfs_alloc_stripe_hash_table(struct btrfs_fs_info *info);
diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index c8658546607f..bd3cd7427391 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -1400,7 +1400,7 @@ static int scrub_submit_raid56_bio_wait(struct btrfs_fs_info *fs_info,
bio->bi_end_io = scrub_bio_wait_endio;
mirror_num = spage->sblock->pagev[0]->mirror_num;
- ret = raid56_parity_recover(fs_info, bio, spage->recover->bioc,
+ ret = raid56_parity_recover(bio, spage->recover->bioc,
spage->recover->map_length,
mirror_num, 0);
if (ret)
@@ -2230,7 +2230,7 @@ static void scrub_missing_raid56_pages(struct scrub_block *sblock)
bio->bi_private = sblock;
bio->bi_end_io = scrub_missing_raid56_end_io;
- rbio = raid56_alloc_missing_rbio(fs_info, bio, bioc, length);
+ rbio = raid56_alloc_missing_rbio(bio, bioc, length);
if (!rbio)
goto rbio_out;
@@ -2846,8 +2846,8 @@ static void scrub_parity_check_and_repair(struct scrub_parity *sparity)
bio->bi_private = sparity;
bio->bi_end_io = scrub_parity_bio_endio;
- rbio = raid56_parity_alloc_scrub_rbio(fs_info, bio, bioc,
- length, sparity->scrub_dev,
+ rbio = raid56_parity_alloc_scrub_rbio(bio, bioc, length,
+ sparity->scrub_dev,
sparity->dbitmap,
sparity->nsectors);
if (!rbio)
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 89c802f8b35b..8fa443891558 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -6709,11 +6709,10 @@ blk_status_t btrfs_map_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
/* In this case, map_length has been set to the length of
a single stripe; not the whole write */
if (btrfs_op(bio) == BTRFS_MAP_WRITE) {
- ret = raid56_parity_write(fs_info, bio, bioc,
- map_length);
+ ret = raid56_parity_write(bio, bioc, map_length);
} else {
- ret = raid56_parity_recover(fs_info, bio, bioc,
- map_length, mirror_num, 1);
+ ret = raid56_parity_recover(bio, bioc, map_length,
+ mirror_num, 1);
}
btrfs_bio_counter_dec(fs_info);
--
2.33.0
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH 1/2] btrfs: make sure btrfs_io_context::fs_info is always initialized
2021-09-23 6:00 [PATCH 1/2] btrfs: make sure btrfs_io_context::fs_info is always initialized Qu Wenruo
2021-09-23 6:00 ` [PATCH 2/2] btrfs: remove btrfs_raid_bio::fs_info member Qu Wenruo
@ 2021-09-23 8:36 ` Nikolay Borisov
2021-09-23 21:12 ` David Sterba
2 siblings, 0 replies; 5+ messages in thread
From: Nikolay Borisov @ 2021-09-23 8:36 UTC (permalink / raw)
To: Qu Wenruo, linux-btrfs
On 23.09.21 г. 9:00, Qu Wenruo wrote:
> Currently btrfs_io_context::fs_info is only initialized in
> btrfs_map_block(), but there are call sites like btrfs_map_sblock()
s/btrfs_map_block/btrfs_map_bio and indeed this is done across function
boundaries which is ugly as hell.
> which calls __btrfs_map_block() directly, leaving bioc::fs_info
> uninitialized (NULL).
>
> Currently this is fine, but later cleanup will rely on bioc::fs_info to
> grab fs_info, and this can be a hidden problem for such usage.
>
> This patch will remove such hidden uninitialized member by always
> assigning bioc::fs_info at alloc_btrfs_io_context().
>
> Signed-off-by: Qu Wenruo <wqu@suse.com>
With the changelog change so that it's consistent with the changed code:
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH 2/2] btrfs: remove btrfs_raid_bio::fs_info member
2021-09-23 6:00 ` [PATCH 2/2] btrfs: remove btrfs_raid_bio::fs_info member Qu Wenruo
@ 2021-09-23 8:53 ` Nikolay Borisov
0 siblings, 0 replies; 5+ messages in thread
From: Nikolay Borisov @ 2021-09-23 8:53 UTC (permalink / raw)
To: Qu Wenruo, linux-btrfs
On 23.09.21 г. 9:00, Qu Wenruo wrote:
> We can grab fs_info reliably from btrfs_raid_bio::bioc, as the bioc is
> always passed into alloc_rbio(), and only get released when the raid bio
> is released.
>
> This patch will remove btrfs_raid_bio::fs_info member, and cleanup all
> the @fs_info parameters for alloc_rbio() callers.
>
> Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH 1/2] btrfs: make sure btrfs_io_context::fs_info is always initialized
2021-09-23 6:00 [PATCH 1/2] btrfs: make sure btrfs_io_context::fs_info is always initialized Qu Wenruo
2021-09-23 6:00 ` [PATCH 2/2] btrfs: remove btrfs_raid_bio::fs_info member Qu Wenruo
2021-09-23 8:36 ` [PATCH 1/2] btrfs: make sure btrfs_io_context::fs_info is always initialized Nikolay Borisov
@ 2021-09-23 21:12 ` David Sterba
2 siblings, 0 replies; 5+ messages in thread
From: David Sterba @ 2021-09-23 21:12 UTC (permalink / raw)
To: Qu Wenruo; +Cc: linux-btrfs
On Thu, Sep 23, 2021 at 02:00:08PM +0800, Qu Wenruo wrote:
> Currently btrfs_io_context::fs_info is only initialized in
> btrfs_map_block(), but there are call sites like btrfs_map_sblock()
> which calls __btrfs_map_block() directly, leaving bioc::fs_info
> uninitialized (NULL).
>
> Currently this is fine, but later cleanup will rely on bioc::fs_info to
> grab fs_info, and this can be a hidden problem for such usage.
>
> This patch will remove such hidden uninitialized member by always
> assigning bioc::fs_info at alloc_btrfs_io_context().
>
> Signed-off-by: Qu Wenruo <wqu@suse.com>
Added to misc-next, thanks.
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2021-09-23 21:12 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-09-23 6:00 [PATCH 1/2] btrfs: make sure btrfs_io_context::fs_info is always initialized Qu Wenruo
2021-09-23 6:00 ` [PATCH 2/2] btrfs: remove btrfs_raid_bio::fs_info member Qu Wenruo
2021-09-23 8:53 ` Nikolay Borisov
2021-09-23 8:36 ` [PATCH 1/2] btrfs: make sure btrfs_io_context::fs_info is always initialized Nikolay Borisov
2021-09-23 21:12 ` David Sterba
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