btrfs: raid56: Remove VLA usage

In the quest to remove all stack VLA usage from the kernel[1], this
allocates the working buffers during regular init, instead of using stack
space. This refactors the allocation code a bit to make it easier
to review.

[1] https://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@mail.gmail.com

Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 28 insertions, 10 deletions

diff --git a/fs/btrfs/raid56.c b/fs/btrfs/raid56.c
index 9abd950e7f78..5e4ad134b9ad 100644
--- a/fs/btrfs/raid56.c
+++ b/fs/btrfs/raid56.c
@@ -163,6 +163,12 @@ struct btrfs_raid_bio {
          * bitmap to record which horizontal stripe has data
          */
         unsigned long *dbitmap;
+
+        /* allocated with real_stripes-many pointers for finish_*() calls */
+        void **finish_pointers;
+
+        /* allocated with stripe_npages-many bits for finish_*() calls */
+        unsigned long *finish_pbitmap;
 };
 
 static int __raid56_parity_recover(struct btrfs_raid_bio *rbio);
@@ -981,9 +987,14 @@ static struct btrfs_raid_bio *alloc_rbio(struct btrfs_fs_info *fs_info,
         int stripe_npages = DIV_ROUND_UP(stripe_len, PAGE_SIZE);
         void *p;
 
-        rbio = kzalloc(sizeof(*rbio) + num_pages * sizeof(struct page *) * 2 +
-                       DIV_ROUND_UP(stripe_npages, BITS_PER_LONG) *
-                       sizeof(long), GFP_NOFS);
+        rbio = kzalloc(sizeof(*rbio) +
+                       sizeof(*rbio->stripe_pages) * num_pages +
+                       sizeof(*rbio->bio_pages) * num_pages +
+                       sizeof(*rbio->finish_pointers) * real_stripes +
+                       sizeof(*rbio->dbitmap) * BITS_TO_LONGS(stripe_npages) +
+                       sizeof(*rbio->finish_pbitmap) *
+                                BITS_TO_LONGS(stripe_npages),
+                       GFP_NOFS);
         if (!rbio)
                 return ERR_PTR(-ENOMEM);
 
@@ -1005,13 +1016,20 @@ static struct btrfs_raid_bio *alloc_rbio(struct btrfs_fs_info *fs_info,
         atomic_set(&rbio->stripes_pending, 0);
 
         /*
-         * the stripe_pages and bio_pages array point to the extra
+         * the stripe_pages, bio_pages, etc arrays 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;
-        rbio->dbitmap = p + sizeof(struct page *) * num_pages * 2;
+#define CONSUME_ALLOC(ptr, count)       do {                            \
+                ptr = p;                                                \
+                p = (unsigned char *)p + sizeof(*(ptr)) * (count);      \
+        } while (0)
+        CONSUME_ALLOC(rbio->stripe_pages, num_pages);
+        CONSUME_ALLOC(rbio->bio_pages, num_pages);
+        CONSUME_ALLOC(rbio->finish_pointers, real_stripes);
+        CONSUME_ALLOC(rbio->dbitmap, BITS_TO_LONGS(stripe_npages));
+        CONSUME_ALLOC(rbio->finish_pbitmap, BITS_TO_LONGS(stripe_npages));
+#undef  CONSUME_ALLOC
 
         if (bbio->map_type & BTRFS_BLOCK_GROUP_RAID5)
                 nr_data = real_stripes - 1;
@@ -1180,7 +1198,7 @@ static void index_rbio_pages(struct btrfs_raid_bio *rbio)
 static noinline void finish_rmw(struct btrfs_raid_bio *rbio)
 {
         struct btrfs_bio *bbio = rbio->bbio;
-        void *pointers[rbio->real_stripes];
+        void **pointers = rbio->finish_pointers;
         int nr_data = rbio->nr_data;
         int stripe;
         int pagenr;
@@ -2350,8 +2368,8 @@ static noinline void finish_parity_scrub(struct btrfs_raid_bio *rbio,
                                          int need_check)
 {
         struct btrfs_bio *bbio = rbio->bbio;
-        void *pointers[rbio->real_stripes];
-        DECLARE_BITMAP(pbitmap, rbio->stripe_npages);
+        void **pointers = rbio->finish_pointers;
+        unsigned long *pbitmap = rbio->finish_pbitmap;
         int nr_data = rbio->nr_data;
         int stripe;
         int pagenr;