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erofs: adjust per-CPU buffers according to max_pclusterblks

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Adjust per-CPU buffers on demand since big pcluster definition is
available. Also, bail out unsupported pcluster size according to
Z_EROFS_PCLUSTER_MAX_SIZE.

Link: https://lore.kernel.org/r/20210407043927.10623-7-xiang@kernel.org
Acked-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
This commit is contained in:
Gao Xiang 2021-04-07 12:39:23 +08:00
parent 5404c33010
commit 4fea63f7d7
2 changed files with 18 additions and 4 deletions
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20
fs/erofs/decompressor.c
View File

@ -32,6 +32,7 @@ int z_erofs_load_lz4_config(struct super_block *sb,
struct erofs_super_block *dsb, struct erofs_super_block *dsb,
struct z_erofs_lz4_cfgs *lz4, int size) struct z_erofs_lz4_cfgs *lz4, int size)
{ {
struct erofs_sb_info *sbi = EROFS_SB(sb);
u16 distance; u16 distance;
if (lz4) { if (lz4) {
@ -40,16 +41,27 @@ int z_erofs_load_lz4_config(struct super_block *sb,
return -EINVAL; return -EINVAL;
} }
distance = le16_to_cpu(lz4->max_distance); distance = le16_to_cpu(lz4->max_distance);
sbi->lz4.max_pclusterblks = le16_to_cpu(lz4->max_pclusterblks);
if (!sbi->lz4.max_pclusterblks) {
sbi->lz4.max_pclusterblks = 1; /* reserved case */
} else if (sbi->lz4.max_pclusterblks >
Z_EROFS_PCLUSTER_MAX_SIZE / EROFS_BLKSIZ) {
erofs_err(sb, "too large lz4 pclusterblks %u",
sbi->lz4.max_pclusterblks);
return -EINVAL;
} else if (sbi->lz4.max_pclusterblks >= 2) {
erofs_info(sb, "EXPERIMENTAL big pcluster feature in use. Use at your own risk!");
}
} else { } else {
distance = le16_to_cpu(dsb->u1.lz4_max_distance); distance = le16_to_cpu(dsb->u1.lz4_max_distance);
sbi->lz4.max_pclusterblks = 1;
} }
EROFS_SB(sb)->lz4.max_distance_pages = distance ? sbi->lz4.max_distance_pages = distance ?
DIV_ROUND_UP(distance, PAGE_SIZE) + 1 : DIV_ROUND_UP(distance, PAGE_SIZE) + 1 :
LZ4_MAX_DISTANCE_PAGES; LZ4_MAX_DISTANCE_PAGES;
return erofs_pcpubuf_growsize(sbi->lz4.max_pclusterblks);
/* TODO: use max pclusterblks after bigpcluster is enabled */
return erofs_pcpubuf_growsize(1);
} }
static int z_erofs_lz4_prepare_destpages(struct z_erofs_decompress_req *rq, static int z_erofs_lz4_prepare_destpages(struct z_erofs_decompress_req *rq,

2
fs/erofs/internal.h
View File

@ -63,6 +63,8 @@ struct erofs_fs_context {
struct erofs_sb_lz4_info { struct erofs_sb_lz4_info {
/* # of pages needed for EROFS lz4 rolling decompression */ /* # of pages needed for EROFS lz4 rolling decompression */
u16 max_distance_pages; u16 max_distance_pages;
/* maximum possible blocks for pclusters in the filesystem */
u16 max_pclusterblks;
}; };
struct erofs_sb_info { struct erofs_sb_info {