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btrfs: cache max and min order inside btrfs_fs_info

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Inside btrfs_fs_info we cache several bits shift like sectorsize_bits.

Apply this to max and min folio orders so that every time mapping order
needs to be applied we can skip the calculation.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2025-09-01 07:55:00 +09:30 committed by David Sterba
parent 7425a28940
commit ea77a1c1c7
3 changed files with 7 additions and 3 deletions
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6
fs/btrfs/btrfs_inode.h
View File

@ -532,9 +532,9 @@ static inline void btrfs_set_inode_mapping_order(struct btrfs_inode *inode)
/* We only allow BITS_PER_LONGS blocks for each bitmap. */
#ifdef CONFIG_BTRFS_EXPERIMENTAL
mapping_set_folio_order_range(inode->vfs_inode.i_mapping, 0,
ilog2(((BITS_PER_LONG << inode->root->fs_info->sectorsize_bits)
>> PAGE_SHIFT)));
mapping_set_folio_order_range(inode->vfs_inode.i_mapping,
inode->root->fs_info->block_min_order,
inode->root->fs_info->block_max_order);
#endif
}

2
fs/btrfs/disk-io.c
View File

@ -3383,6 +3383,8 @@ int __cold open_ctree(struct super_block *sb, struct btrfs_fs_devices *fs_device
fs_info->nodesize_bits = ilog2(nodesize);
fs_info->sectorsize = sectorsize;
fs_info->sectorsize_bits = ilog2(sectorsize);
fs_info->block_min_order = ilog2(round_up(sectorsize, PAGE_SIZE) >> PAGE_SHIFT);
fs_info->block_max_order = ilog2((BITS_PER_LONG << fs_info->sectorsize_bits) >> PAGE_SHIFT);
fs_info->csums_per_leaf = BTRFS_MAX_ITEM_SIZE(fs_info) / fs_info->csum_size;
fs_info->stripesize = stripesize;
fs_info->fs_devices->fs_info = fs_info;

2
fs/btrfs/fs.h
View File

@ -825,6 +825,8 @@ struct btrfs_fs_info {
u32 sectorsize;
/* ilog2 of sectorsize, use to avoid 64bit division */
u32 sectorsize_bits;
u32 block_min_order;
u32 block_max_order;
u32 csum_size;
u32 csums_per_leaf;
u32 stripesize;