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btrfs: set max_extent_size properly 

We can't use entry->bytes if our entry is a bitmap entry, we need to use
entry->max_extent_size in that case.  Fix up all the logic to make this
consistent.

CC: stable@vger.kernel.org # 4.4+
Signed-off-by: Josef Bacik <jbacik@fb.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2018-10-12 15:32:33 -04:00 committed by David Sterba
parent 21a94f7acf
commit ad22cf6ea4
1 changed files with 20 additions and 10 deletions
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30
fs/btrfs/free-space-cache.c
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@ -1772,6 +1772,13 @@ static int search_bitmap(struct btrfs_free_space_ctl *ctl,
return -1;
}
static inline u64 get_max_extent_size(struct btrfs_free_space *entry)
{
if (entry->bitmap)
return entry->max_extent_size;
return entry->bytes;
}
/* Cache the size of the max extent in bytes */
static struct btrfs_free_space *
find_free_space(struct btrfs_free_space_ctl *ctl, u64 *offset, u64 *bytes,
@ -1793,8 +1800,8 @@ find_free_space(struct btrfs_free_space_ctl *ctl, u64 *offset, u64 *bytes,
for (node = &entry->offset_index; node; node = rb_next(node)) {
entry = rb_entry(node, struct btrfs_free_space, offset_index);
if (entry->bytes < *bytes) {
if (entry->bytes > *max_extent_size)
*max_extent_size = entry->bytes;
*max_extent_size = max(get_max_extent_size(entry),
*max_extent_size);
continue;
}
@ -1812,8 +1819,8 @@ find_free_space(struct btrfs_free_space_ctl *ctl, u64 *offset, u64 *bytes,
}
if (entry->bytes < *bytes + align_off) {
if (entry->bytes > *max_extent_size)
*max_extent_size = entry->bytes;
*max_extent_size = max(get_max_extent_size(entry),
*max_extent_size);
continue;
}
@ -1825,8 +1832,10 @@ find_free_space(struct btrfs_free_space_ctl *ctl, u64 *offset, u64 *bytes,
*offset = tmp;
*bytes = size;
return entry;
} else if (size > *max_extent_size) {
*max_extent_size = size;
} else {
*max_extent_size =
max(get_max_extent_size(entry),
*max_extent_size);
}
continue;
}
@ -2685,8 +2694,8 @@ static u64 btrfs_alloc_from_bitmap(struct btrfs_block_group_cache *block_group,
err = search_bitmap(ctl, entry, &search_start, &search_bytes, true);
if (err) {
if (search_bytes > *max_extent_size)
*max_extent_size = search_bytes;
*max_extent_size = max(get_max_extent_size(entry),
*max_extent_size);
return 0;
}
@ -2723,8 +2732,9 @@ u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group,
entry = rb_entry(node, struct btrfs_free_space, offset_index);
while (1) {
if (entry->bytes < bytes && entry->bytes > *max_extent_size)
*max_extent_size = entry->bytes;
if (entry->bytes < bytes)
*max_extent_size = max(get_max_extent_size(entry),
*max_extent_size);
if (entry->bytes < bytes ||
(!entry->bitmap && entry->offset < min_start)) {