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staging: erofs: add compacted compression indexes support
This patch aims at compacted compression indexes: 1) cleanup z_erofs_map_blocks_iter and move into zmap.c; 2) add compacted 4/2B decoding support. On kirin980 platform, sequential read is increased about 6% (725MiB/s -> 770MiB/s) on enwik9 dataset if compacted 2B feature is enabled. Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Gao Xiang
Greg Kroah-Hartman
parent
ec8c244205
commit
152a333a58
@ -9,5 +9,5 @@ obj-$(CONFIG_EROFS_FS) += erofs.o
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ccflags-y += -I $(srctree)/$(src)/include
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erofs-objs := super.o inode.o data.o namei.o dir.o utils.o
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erofs-$(CONFIG_EROFS_FS_XATTR) += xattr.o
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erofs-$(CONFIG_EROFS_FS_ZIP) += unzip_vle.o unzip_vle_lz4.o
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erofs-$(CONFIG_EROFS_FS_ZIP) += unzip_vle.o unzip_vle_lz4.o zmap.o
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@ -210,12 +210,7 @@ static int fill_inode(struct inode *inode, int isdir)
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}
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if (is_inode_layout_compression(inode)) {
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#ifdef CONFIG_EROFS_FS_ZIP
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inode->i_mapping->a_ops =
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&z_erofs_vle_normalaccess_aops;
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#else
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err = -ENOTSUPP;
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#endif
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err = z_erofs_fill_inode(inode);
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goto out_unlock;
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}
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@ -339,9 +339,11 @@ static inline erofs_off_t iloc(struct erofs_sb_info *sbi, erofs_nid_t nid)
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/* atomic flag definitions */
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#define EROFS_V_EA_INITED_BIT 0
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#define EROFS_V_Z_INITED_BIT 1
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/* bitlock definitions (arranged in reverse order) */
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#define EROFS_V_BL_XATTR_BIT (BITS_PER_LONG - 1)
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#define EROFS_V_BL_Z_BIT (BITS_PER_LONG - 2)
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struct erofs_vnode {
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erofs_nid_t nid;
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@ -356,8 +358,17 @@ struct erofs_vnode {
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unsigned xattr_shared_count;
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unsigned *xattr_shared_xattrs;
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erofs_blk_t raw_blkaddr;
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union {
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erofs_blk_t raw_blkaddr;
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#ifdef CONFIG_EROFS_FS_ZIP
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struct {
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unsigned short z_advise;
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unsigned char z_algorithmtype[2];
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unsigned char z_logical_clusterbits;
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unsigned char z_physical_clusterbits[2];
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};
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#endif
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};
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/* the corresponding vfs inode */
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struct inode vfs_inode;
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};
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@ -447,11 +458,14 @@ struct erofs_map_blocks {
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/* Flags used by erofs_map_blocks() */
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#define EROFS_GET_BLOCKS_RAW 0x0001
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/* zmap.c */
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#ifdef CONFIG_EROFS_FS_ZIP
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int z_erofs_fill_inode(struct inode *inode);
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int z_erofs_map_blocks_iter(struct inode *inode,
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struct erofs_map_blocks *map,
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int flags);
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#else
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static inline int z_erofs_fill_inode(struct inode *inode) { return -ENOTSUPP; }
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static inline int z_erofs_map_blocks_iter(struct inode *inode,
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struct erofs_map_blocks *map,
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int flags)
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@ -1600,289 +1600,3 @@ const struct address_space_operations z_erofs_vle_normalaccess_aops = {
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.readpages = z_erofs_vle_normalaccess_readpages,
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};
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/*
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* Variable-sized Logical Extent (Fixed Physical Cluster) Compression Mode
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* ---
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* VLE compression mode attempts to compress a number of logical data into
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* a physical cluster with a fixed size.
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* VLE compression mode uses "struct z_erofs_vle_decompressed_index".
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*/
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#define __vle_cluster_advise(x, bit, bits) \
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((le16_to_cpu(x) >> (bit)) & ((1 << (bits)) - 1))
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#define __vle_cluster_type(advise) __vle_cluster_advise(advise, \
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Z_EROFS_VLE_DI_CLUSTER_TYPE_BIT, Z_EROFS_VLE_DI_CLUSTER_TYPE_BITS)
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#define vle_cluster_type(di) \
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__vle_cluster_type((di)->di_advise)
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static int
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vle_decompressed_index_clusterofs(unsigned int *clusterofs,
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unsigned int clustersize,
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struct z_erofs_vle_decompressed_index *di)
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{
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switch (vle_cluster_type(di)) {
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case Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD:
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*clusterofs = clustersize;
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break;
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case Z_EROFS_VLE_CLUSTER_TYPE_PLAIN:
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case Z_EROFS_VLE_CLUSTER_TYPE_HEAD:
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*clusterofs = le16_to_cpu(di->di_clusterofs);
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break;
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default:
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DBG_BUGON(1);
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return -EIO;
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}
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return 0;
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}
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static inline erofs_blk_t
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vle_extent_blkaddr(struct inode *inode, pgoff_t index)
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{
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struct erofs_sb_info *sbi = EROFS_I_SB(inode);
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struct erofs_vnode *vi = EROFS_V(inode);
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unsigned int ofs = Z_EROFS_VLE_LEGACY_INDEX_ALIGN(vi->inode_isize +
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vi->xattr_isize) +
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index * sizeof(struct z_erofs_vle_decompressed_index);
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return erofs_blknr(iloc(sbi, vi->nid) + ofs);
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}
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static inline unsigned int
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vle_extent_blkoff(struct inode *inode, pgoff_t index)
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{
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struct erofs_sb_info *sbi = EROFS_I_SB(inode);
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struct erofs_vnode *vi = EROFS_V(inode);
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unsigned int ofs = Z_EROFS_VLE_LEGACY_INDEX_ALIGN(vi->inode_isize +
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vi->xattr_isize) +
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index * sizeof(struct z_erofs_vle_decompressed_index);
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return erofs_blkoff(iloc(sbi, vi->nid) + ofs);
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}
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struct vle_map_blocks_iter_ctx {
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struct inode *inode;
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struct super_block *sb;
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unsigned int clusterbits;
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struct page **mpage_ret;
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void **kaddr_ret;
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};
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static int
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vle_get_logical_extent_head(const struct vle_map_blocks_iter_ctx *ctx,
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unsigned int lcn, /* logical cluster number */
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unsigned long long *ofs,
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erofs_blk_t *pblk,
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unsigned int *flags)
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{
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const unsigned int clustersize = 1 << ctx->clusterbits;
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const erofs_blk_t mblk = vle_extent_blkaddr(ctx->inode, lcn);
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struct page *mpage = *ctx->mpage_ret; /* extent metapage */
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struct z_erofs_vle_decompressed_index *di;
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unsigned int cluster_type, delta0;
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if (mpage->index != mblk) {
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kunmap_atomic(*ctx->kaddr_ret);
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unlock_page(mpage);
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put_page(mpage);
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mpage = erofs_get_meta_page(ctx->sb, mblk, false);
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if (IS_ERR(mpage)) {
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*ctx->mpage_ret = NULL;
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return PTR_ERR(mpage);
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}
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*ctx->mpage_ret = mpage;
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*ctx->kaddr_ret = kmap_atomic(mpage);
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}
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di = *ctx->kaddr_ret + vle_extent_blkoff(ctx->inode, lcn);
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cluster_type = vle_cluster_type(di);
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switch (cluster_type) {
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case Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD:
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delta0 = le16_to_cpu(di->di_u.delta[0]);
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if (unlikely(!delta0 || delta0 > lcn)) {
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errln("invalid NONHEAD dl0 %u at lcn %u of nid %llu",
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delta0, lcn, EROFS_V(ctx->inode)->nid);
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DBG_BUGON(1);
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return -EIO;
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}
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return vle_get_logical_extent_head(ctx,
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lcn - delta0, ofs, pblk, flags);
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case Z_EROFS_VLE_CLUSTER_TYPE_PLAIN:
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*flags ^= EROFS_MAP_ZIPPED;
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/* fallthrough */
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case Z_EROFS_VLE_CLUSTER_TYPE_HEAD:
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/* clustersize should be a power of two */
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*ofs = ((u64)lcn << ctx->clusterbits) +
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(le16_to_cpu(di->di_clusterofs) & (clustersize - 1));
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*pblk = le32_to_cpu(di->di_u.blkaddr);
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break;
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default:
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errln("unknown cluster type %u at lcn %u of nid %llu",
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cluster_type, lcn, EROFS_V(ctx->inode)->nid);
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DBG_BUGON(1);
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return -EIO;
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}
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return 0;
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}
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int z_erofs_map_blocks_iter(struct inode *inode,
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struct erofs_map_blocks *map,
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int flags)
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{
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void *kaddr;
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const struct vle_map_blocks_iter_ctx ctx = {
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.inode = inode,
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.sb = inode->i_sb,
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.clusterbits = EROFS_I_SB(inode)->clusterbits,
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.mpage_ret = &map->mpage,
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.kaddr_ret = &kaddr
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};
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const unsigned int clustersize = 1 << ctx.clusterbits;
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/* if both m_(l,p)len are 0, regularize l_lblk, l_lofs, etc... */
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const bool initial = !map->m_llen;
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/* logicial extent (start, end) offset */
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unsigned long long ofs, end;
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unsigned int lcn;
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u32 ofs_rem;
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/* initialize `pblk' to keep gcc from printing foolish warnings */
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erofs_blk_t mblk, pblk = 0;
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struct page *mpage = map->mpage;
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struct z_erofs_vle_decompressed_index *di;
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unsigned int cluster_type, logical_cluster_ofs;
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int err = 0;
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trace_z_erofs_map_blocks_iter_enter(inode, map, flags);
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/* when trying to read beyond EOF, leave it unmapped */
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if (unlikely(map->m_la >= inode->i_size)) {
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DBG_BUGON(!initial);
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map->m_llen = map->m_la + 1 - inode->i_size;
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map->m_la = inode->i_size;
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map->m_flags = 0;
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goto out;
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}
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debugln("%s, m_la %llu m_llen %llu --- start", __func__,
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map->m_la, map->m_llen);
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ofs = map->m_la + map->m_llen;
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/* clustersize should be power of two */
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lcn = ofs >> ctx.clusterbits;
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ofs_rem = ofs & (clustersize - 1);
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mblk = vle_extent_blkaddr(inode, lcn);
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if (!mpage || mpage->index != mblk) {
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if (mpage)
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put_page(mpage);
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mpage = erofs_get_meta_page(ctx.sb, mblk, false);
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if (IS_ERR(mpage)) {
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err = PTR_ERR(mpage);
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goto out;
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}
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map->mpage = mpage;
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} else {
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lock_page(mpage);
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DBG_BUGON(!PageUptodate(mpage));
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}
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kaddr = kmap_atomic(mpage);
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di = kaddr + vle_extent_blkoff(inode, lcn);
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debugln("%s, lcn %u mblk %u e_blkoff %u", __func__, lcn,
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mblk, vle_extent_blkoff(inode, lcn));
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err = vle_decompressed_index_clusterofs(&logical_cluster_ofs,
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clustersize, di);
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if (unlikely(err))
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goto unmap_out;
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if (!initial) {
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/* [walking mode] 'map' has been already initialized */
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map->m_llen += logical_cluster_ofs;
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goto unmap_out;
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}
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/* by default, compressed */
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map->m_flags |= EROFS_MAP_ZIPPED;
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end = ((u64)lcn + 1) * clustersize;
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cluster_type = vle_cluster_type(di);
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switch (cluster_type) {
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case Z_EROFS_VLE_CLUSTER_TYPE_PLAIN:
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if (ofs_rem >= logical_cluster_ofs)
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map->m_flags ^= EROFS_MAP_ZIPPED;
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/* fallthrough */
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case Z_EROFS_VLE_CLUSTER_TYPE_HEAD:
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if (ofs_rem == logical_cluster_ofs) {
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pblk = le32_to_cpu(di->di_u.blkaddr);
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goto exact_hitted;
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}
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if (ofs_rem > logical_cluster_ofs) {
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ofs = (u64)lcn * clustersize | logical_cluster_ofs;
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pblk = le32_to_cpu(di->di_u.blkaddr);
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break;
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}
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/* logical cluster number should be >= 1 */
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if (unlikely(!lcn)) {
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errln("invalid logical cluster 0 at nid %llu",
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EROFS_V(inode)->nid);
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err = -EIO;
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goto unmap_out;
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}
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end = ((u64)lcn-- * clustersize) | logical_cluster_ofs;
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/* fallthrough */
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case Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD:
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/* get the correspoinding first chunk */
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err = vle_get_logical_extent_head(&ctx, lcn, &ofs,
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&pblk, &map->m_flags);
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mpage = map->mpage;
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if (unlikely(err)) {
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if (mpage)
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goto unmap_out;
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goto out;
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}
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break;
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default:
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errln("unknown cluster type %u at offset %llu of nid %llu",
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cluster_type, ofs, EROFS_V(inode)->nid);
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err = -EIO;
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goto unmap_out;
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}
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map->m_la = ofs;
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exact_hitted:
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map->m_llen = end - ofs;
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map->m_plen = clustersize;
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map->m_pa = blknr_to_addr(pblk);
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map->m_flags |= EROFS_MAP_MAPPED;
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unmap_out:
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kunmap_atomic(kaddr);
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unlock_page(mpage);
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out:
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debugln("%s, m_la %llu m_pa %llu m_llen %llu m_plen %llu m_flags 0%o",
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__func__, map->m_la, map->m_pa,
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map->m_llen, map->m_plen, map->m_flags);
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trace_z_erofs_map_blocks_iter_exit(inode, map, flags, err);
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/* aggressively BUG_ON iff CONFIG_EROFS_FS_DEBUG is on */
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DBG_BUGON(err < 0 && err != -ENOMEM);
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return err;
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}
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462
drivers/staging/erofs/zmap.c
Normal file
462
drivers/staging/erofs/zmap.c
Normal file
@ -0,0 +1,462 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/drivers/staging/erofs/zmap.c
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*
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* Copyright (C) 2018-2019 HUAWEI, Inc.
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* http://www.huawei.com/
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* Created by Gao Xiang <gaoxiang25@huawei.com>
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*/
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#include "internal.h"
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#include <asm/unaligned.h>
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#include <trace/events/erofs.h>
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int z_erofs_fill_inode(struct inode *inode)
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{
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struct erofs_vnode *const vi = EROFS_V(inode);
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struct super_block *const sb = inode->i_sb;
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if (vi->datamode == EROFS_INODE_FLAT_COMPRESSION_LEGACY) {
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vi->z_advise = 0;
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vi->z_algorithmtype[0] = 0;
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vi->z_algorithmtype[1] = 0;
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vi->z_logical_clusterbits = EROFS_SB(sb)->clusterbits;
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vi->z_physical_clusterbits[0] = vi->z_logical_clusterbits;
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vi->z_physical_clusterbits[1] = vi->z_logical_clusterbits;
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set_bit(EROFS_V_Z_INITED_BIT, &vi->flags);
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}
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inode->i_mapping->a_ops = &z_erofs_vle_normalaccess_aops;
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return 0;
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}
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static int fill_inode_lazy(struct inode *inode)
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{
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struct erofs_vnode *const vi = EROFS_V(inode);
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struct super_block *const sb = inode->i_sb;
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int err;
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erofs_off_t pos;
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struct page *page;
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void *kaddr;
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struct z_erofs_map_header *h;
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if (test_bit(EROFS_V_Z_INITED_BIT, &vi->flags))
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return 0;
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if (wait_on_bit_lock(&vi->flags, EROFS_V_BL_Z_BIT, TASK_KILLABLE))
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return -ERESTARTSYS;
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err = 0;
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if (test_bit(EROFS_V_Z_INITED_BIT, &vi->flags))
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goto out_unlock;
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DBG_BUGON(vi->datamode == EROFS_INODE_FLAT_COMPRESSION_LEGACY);
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pos = ALIGN(iloc(EROFS_SB(sb), vi->nid) + vi->inode_isize +
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vi->xattr_isize, 8);
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page = erofs_get_meta_page(sb, erofs_blknr(pos), false);
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if (IS_ERR(page)) {
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err = PTR_ERR(page);
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goto out_unlock;
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}
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kaddr = kmap_atomic(page);
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h = kaddr + erofs_blkoff(pos);
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vi->z_advise = le16_to_cpu(h->h_advise);
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vi->z_algorithmtype[0] = h->h_algorithmtype & 15;
|
||||
vi->z_algorithmtype[1] = h->h_algorithmtype >> 4;
|
||||
|
||||
if (vi->z_algorithmtype[0] >= Z_EROFS_COMPRESSION_MAX) {
|
||||
errln("unknown compression format %u for nid %llu, please upgrade kernel",
|
||||
vi->z_algorithmtype[0], vi->nid);
|
||||
err = -ENOTSUPP;
|
||||
goto unmap_done;
|
||||
}
|
||||
|
||||
vi->z_logical_clusterbits = LOG_BLOCK_SIZE + (h->h_clusterbits & 7);
|
||||
vi->z_physical_clusterbits[0] = vi->z_logical_clusterbits +
|
||||
((h->h_clusterbits >> 3) & 3);
|
||||
|
||||
if (vi->z_physical_clusterbits[0] != LOG_BLOCK_SIZE) {
|
||||
errln("unsupported physical clusterbits %u for nid %llu, please upgrade kernel",
|
||||
vi->z_physical_clusterbits[0], vi->nid);
|
||||
err = -ENOTSUPP;
|
||||
goto unmap_done;
|
||||
}
|
||||
|
||||
vi->z_physical_clusterbits[1] = vi->z_logical_clusterbits +
|
||||
((h->h_clusterbits >> 5) & 7);
|
||||
unmap_done:
|
||||
kunmap_atomic(kaddr);
|
||||
unlock_page(page);
|
||||
put_page(page);
|
||||
|
||||
set_bit(EROFS_V_Z_INITED_BIT, &vi->flags);
|
||||
out_unlock:
|
||||
clear_and_wake_up_bit(EROFS_V_BL_Z_BIT, &vi->flags);
|
||||
return err;
|
||||
}
|
||||
|
||||
struct z_erofs_maprecorder {
|
||||
struct inode *inode;
|
||||
struct erofs_map_blocks *map;
|
||||
void *kaddr;
|
||||
|
||||
unsigned long lcn;
|
||||
/* compression extent information gathered */
|
||||
u8 type;
|
||||
u16 clusterofs;
|
||||
u16 delta[2];
|
||||
erofs_blk_t pblk;
|
||||
};
|
||||
|
||||
static int z_erofs_reload_indexes(struct z_erofs_maprecorder *m,
|
||||
erofs_blk_t eblk)
|
||||
{
|
||||
struct super_block *const sb = m->inode->i_sb;
|
||||
struct erofs_map_blocks *const map = m->map;
|
||||
struct page *mpage = map->mpage;
|
||||
|
||||
if (mpage) {
|
||||
if (mpage->index == eblk) {
|
||||
if (!m->kaddr)
|
||||
m->kaddr = kmap_atomic(mpage);
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (m->kaddr) {
|
||||
kunmap_atomic(m->kaddr);
|
||||
m->kaddr = NULL;
|
||||
}
|
||||
put_page(mpage);
|
||||
}
|
||||
|
||||
mpage = erofs_get_meta_page(sb, eblk, false);
|
||||
if (IS_ERR(mpage)) {
|
||||
map->mpage = NULL;
|
||||
return PTR_ERR(mpage);
|
||||
}
|
||||
m->kaddr = kmap_atomic(mpage);
|
||||
unlock_page(mpage);
|
||||
map->mpage = mpage;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int vle_legacy_load_cluster_from_disk(struct z_erofs_maprecorder *m,
|
||||
unsigned long lcn)
|
||||
{
|
||||
struct inode *const inode = m->inode;
|
||||
struct erofs_vnode *const vi = EROFS_V(inode);
|
||||
const erofs_off_t ibase = iloc(EROFS_I_SB(inode), vi->nid);
|
||||
const erofs_off_t pos =
|
||||
Z_EROFS_VLE_LEGACY_INDEX_ALIGN(ibase + vi->inode_isize +
|
||||
vi->xattr_isize) +
|
||||
lcn * sizeof(struct z_erofs_vle_decompressed_index);
|
||||
struct z_erofs_vle_decompressed_index *di;
|
||||
unsigned int advise, type;
|
||||
int err;
|
||||
|
||||
err = z_erofs_reload_indexes(m, erofs_blknr(pos));
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
m->lcn = lcn;
|
||||
di = m->kaddr + erofs_blkoff(pos);
|
||||
|
||||
advise = le16_to_cpu(di->di_advise);
|
||||
type = (advise >> Z_EROFS_VLE_DI_CLUSTER_TYPE_BIT) &
|
||||
((1 << Z_EROFS_VLE_DI_CLUSTER_TYPE_BITS) - 1);
|
||||
switch (type) {
|
||||
case Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD:
|
||||
m->clusterofs = 1 << vi->z_logical_clusterbits;
|
||||
m->delta[0] = le16_to_cpu(di->di_u.delta[0]);
|
||||
m->delta[1] = le16_to_cpu(di->di_u.delta[1]);
|
||||
break;
|
||||
case Z_EROFS_VLE_CLUSTER_TYPE_PLAIN:
|
||||
case Z_EROFS_VLE_CLUSTER_TYPE_HEAD:
|
||||
m->clusterofs = le16_to_cpu(di->di_clusterofs);
|
||||
m->pblk = le32_to_cpu(di->di_u.blkaddr);
|
||||
break;
|
||||
default:
|
||||
DBG_BUGON(1);
|
||||
return -EIO;
|
||||
}
|
||||
m->type = type;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static unsigned int decode_compactedbits(unsigned int lobits,
|
||||
unsigned int lomask,
|
||||
u8 *in, unsigned int pos, u8 *type)
|
||||
{
|
||||
const unsigned int v = get_unaligned_le32(in + pos / 8) >> (pos & 7);
|
||||
const unsigned int lo = v & lomask;
|
||||
|
||||
*type = (v >> lobits) & 3;
|
||||
return lo;
|
||||
}
|
||||
|
||||
static int unpack_compacted_index(struct z_erofs_maprecorder *m,
|
||||
unsigned int amortizedshift,
|
||||
unsigned int eofs)
|
||||
{
|
||||
struct erofs_vnode *const vi = EROFS_V(m->inode);
|
||||
const unsigned int lclusterbits = vi->z_logical_clusterbits;
|
||||
const unsigned int lomask = (1 << lclusterbits) - 1;
|
||||
unsigned int vcnt, base, lo, encodebits, nblk;
|
||||
int i;
|
||||
u8 *in, type;
|
||||
|
||||
if (1 << amortizedshift == 4)
|
||||
vcnt = 2;
|
||||
else if (1 << amortizedshift == 2 && lclusterbits == 12)
|
||||
vcnt = 16;
|
||||
else
|
||||
return -ENOTSUPP;
|
||||
|
||||
encodebits = ((vcnt << amortizedshift) - sizeof(__le32)) * 8 / vcnt;
|
||||
base = round_down(eofs, vcnt << amortizedshift);
|
||||
in = m->kaddr + base;
|
||||
|
||||
i = (eofs - base) >> amortizedshift;
|
||||
|
||||
lo = decode_compactedbits(lclusterbits, lomask,
|
||||
in, encodebits * i, &type);
|
||||
m->type = type;
|
||||
if (type == Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD) {
|
||||
m->clusterofs = 1 << lclusterbits;
|
||||
if (i + 1 != vcnt) {
|
||||
m->delta[0] = lo;
|
||||
return 0;
|
||||
}
|
||||
/*
|
||||
* since the last lcluster in the pack is special,
|
||||
* of which lo saves delta[1] rather than delta[0].
|
||||
* Hence, get delta[0] by the previous lcluster indirectly.
|
||||
*/
|
||||
lo = decode_compactedbits(lclusterbits, lomask,
|
||||
in, encodebits * (i - 1), &type);
|
||||
if (type != Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD)
|
||||
lo = 0;
|
||||
m->delta[0] = lo + 1;
|
||||
return 0;
|
||||
}
|
||||
m->clusterofs = lo;
|
||||
m->delta[0] = 0;
|
||||
/* figout out blkaddr (pblk) for HEAD lclusters */
|
||||
nblk = 1;
|
||||
while (i > 0) {
|
||||
--i;
|
||||
lo = decode_compactedbits(lclusterbits, lomask,
|
||||
in, encodebits * i, &type);
|
||||
if (type == Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD)
|
||||
i -= lo;
|
||||
|
||||
if (i >= 0)
|
||||
++nblk;
|
||||
}
|
||||
in += (vcnt << amortizedshift) - sizeof(__le32);
|
||||
m->pblk = le32_to_cpu(*(__le32 *)in) + nblk;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int compacted_load_cluster_from_disk(struct z_erofs_maprecorder *m,
|
||||
unsigned long lcn)
|
||||
{
|
||||
struct inode *const inode = m->inode;
|
||||
struct erofs_vnode *const vi = EROFS_V(inode);
|
||||
const unsigned int lclusterbits = vi->z_logical_clusterbits;
|
||||
const erofs_off_t ebase = ALIGN(iloc(EROFS_I_SB(inode), vi->nid) +
|
||||
vi->inode_isize + vi->xattr_isize, 8) +
|
||||
sizeof(struct z_erofs_map_header);
|
||||
const unsigned int totalidx = DIV_ROUND_UP(inode->i_size, EROFS_BLKSIZ);
|
||||
unsigned int compacted_4b_initial, compacted_2b;
|
||||
unsigned int amortizedshift;
|
||||
erofs_off_t pos;
|
||||
int err;
|
||||
|
||||
if (lclusterbits != 12)
|
||||
return -ENOTSUPP;
|
||||
|
||||
if (lcn >= totalidx)
|
||||
return -EINVAL;
|
||||
|
||||
m->lcn = lcn;
|
||||
/* used to align to 32-byte (compacted_2b) alignment */
|
||||
compacted_4b_initial = (32 - ebase % 32) / 4;
|
||||
if (compacted_4b_initial == 32 / 4)
|
||||
compacted_4b_initial = 0;
|
||||
|
||||
if (vi->z_advise & Z_EROFS_ADVISE_COMPACTED_2B)
|
||||
compacted_2b = rounddown(totalidx - compacted_4b_initial, 16);
|
||||
else
|
||||
compacted_2b = 0;
|
||||
|
||||
pos = ebase;
|
||||
if (lcn < compacted_4b_initial) {
|
||||
amortizedshift = 2;
|
||||
goto out;
|
||||
}
|
||||
pos += compacted_4b_initial * 4;
|
||||
lcn -= compacted_4b_initial;
|
||||
|
||||
if (lcn < compacted_2b) {
|
||||
amortizedshift = 1;
|
||||
goto out;
|
||||
}
|
||||
pos += compacted_2b * 2;
|
||||
lcn -= compacted_2b;
|
||||
amortizedshift = 2;
|
||||
out:
|
||||
pos += lcn * (1 << amortizedshift);
|
||||
err = z_erofs_reload_indexes(m, erofs_blknr(pos));
|
||||
if (err)
|
||||
return err;
|
||||
return unpack_compacted_index(m, amortizedshift, erofs_blkoff(pos));
|
||||
}
|
||||
|
||||
static int vle_load_cluster_from_disk(struct z_erofs_maprecorder *m,
|
||||
unsigned int lcn)
|
||||
{
|
||||
const unsigned int datamode = EROFS_V(m->inode)->datamode;
|
||||
|
||||
if (datamode == EROFS_INODE_FLAT_COMPRESSION_LEGACY)
|
||||
return vle_legacy_load_cluster_from_disk(m, lcn);
|
||||
|
||||
if (datamode == EROFS_INODE_FLAT_COMPRESSION)
|
||||
return compacted_load_cluster_from_disk(m, lcn);
|
||||
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
static int vle_extent_lookback(struct z_erofs_maprecorder *m,
|
||||
unsigned int lookback_distance)
|
||||
{
|
||||
struct erofs_vnode *const vi = EROFS_V(m->inode);
|
||||
struct erofs_map_blocks *const map = m->map;
|
||||
const unsigned int lclusterbits = vi->z_logical_clusterbits;
|
||||
unsigned long lcn = m->lcn;
|
||||
int err;
|
||||
|
||||
if (lcn < lookback_distance) {
|
||||
DBG_BUGON(1);
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
/* load extent head logical cluster if needed */
|
||||
lcn -= lookback_distance;
|
||||
err = vle_load_cluster_from_disk(m, lcn);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
switch (m->type) {
|
||||
case Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD:
|
||||
return vle_extent_lookback(m, m->delta[0]);
|
||||
case Z_EROFS_VLE_CLUSTER_TYPE_PLAIN:
|
||||
map->m_flags &= ~EROFS_MAP_ZIPPED;
|
||||
/* fallthrough */
|
||||
case Z_EROFS_VLE_CLUSTER_TYPE_HEAD:
|
||||
map->m_la = (lcn << lclusterbits) | m->clusterofs;
|
||||
break;
|
||||
default:
|
||||
errln("unknown type %u at lcn %lu of nid %llu",
|
||||
m->type, lcn, vi->nid);
|
||||
DBG_BUGON(1);
|
||||
return -EIO;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
int z_erofs_map_blocks_iter(struct inode *inode,
|
||||
struct erofs_map_blocks *map,
|
||||
int flags)
|
||||
{
|
||||
struct erofs_vnode *const vi = EROFS_V(inode);
|
||||
struct z_erofs_maprecorder m = {
|
||||
.inode = inode,
|
||||
.map = map,
|
||||
};
|
||||
int err = 0;
|
||||
unsigned int lclusterbits, endoff;
|
||||
unsigned long long ofs, end;
|
||||
|
||||
trace_z_erofs_map_blocks_iter_enter(inode, map, flags);
|
||||
|
||||
/* when trying to read beyond EOF, leave it unmapped */
|
||||
if (unlikely(map->m_la >= inode->i_size)) {
|
||||
map->m_llen = map->m_la + 1 - inode->i_size;
|
||||
map->m_la = inode->i_size;
|
||||
map->m_flags = 0;
|
||||
goto out;
|
||||
}
|
||||
|
||||
err = fill_inode_lazy(inode);
|
||||
if (err)
|
||||
goto out;
|
||||
|
||||
lclusterbits = vi->z_logical_clusterbits;
|
||||
ofs = map->m_la;
|
||||
m.lcn = ofs >> lclusterbits;
|
||||
endoff = ofs & ((1 << lclusterbits) - 1);
|
||||
|
||||
err = vle_load_cluster_from_disk(&m, m.lcn);
|
||||
if (err)
|
||||
goto unmap_out;
|
||||
|
||||
map->m_flags = EROFS_MAP_ZIPPED; /* by default, compressed */
|
||||
end = (m.lcn + 1ULL) << lclusterbits;
|
||||
|
||||
switch (m.type) {
|
||||
case Z_EROFS_VLE_CLUSTER_TYPE_PLAIN:
|
||||
if (endoff >= m.clusterofs)
|
||||
map->m_flags &= ~EROFS_MAP_ZIPPED;
|
||||
/* fallthrough */
|
||||
case Z_EROFS_VLE_CLUSTER_TYPE_HEAD:
|
||||
if (endoff >= m.clusterofs) {
|
||||
map->m_la = (m.lcn << lclusterbits) | m.clusterofs;
|
||||
break;
|
||||
}
|
||||
/* m.lcn should be >= 1 if endoff < m.clusterofs */
|
||||
if (unlikely(!m.lcn)) {
|
||||
errln("invalid logical cluster 0 at nid %llu",
|
||||
vi->nid);
|
||||
err = -EIO;
|
||||
goto unmap_out;
|
||||
}
|
||||
end = (m.lcn << lclusterbits) | m.clusterofs;
|
||||
m.delta[0] = 1;
|
||||
/* fallthrough */
|
||||
case Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD:
|
||||
/* get the correspoinding first chunk */
|
||||
err = vle_extent_lookback(&m, m.delta[0]);
|
||||
if (unlikely(err))
|
||||
goto unmap_out;
|
||||
break;
|
||||
default:
|
||||
errln("unknown type %u at offset %llu of nid %llu",
|
||||
m.type, ofs, vi->nid);
|
||||
err = -EIO;
|
||||
goto unmap_out;
|
||||
}
|
||||
|
||||
map->m_llen = end - map->m_la;
|
||||
map->m_plen = 1 << lclusterbits;
|
||||
map->m_pa = blknr_to_addr(m.pblk);
|
||||
map->m_flags |= EROFS_MAP_MAPPED;
|
||||
|
||||
unmap_out:
|
||||
if (m.kaddr)
|
||||
kunmap_atomic(m.kaddr);
|
||||
|
||||
out:
|
||||
debugln("%s, m_la %llu m_pa %llu m_llen %llu m_plen %llu m_flags 0%o",
|
||||
__func__, map->m_la, map->m_pa,
|
||||
map->m_llen, map->m_plen, map->m_flags);
|
||||
|
||||
trace_z_erofs_map_blocks_iter_exit(inode, map, flags, err);
|
||||
|
||||
/* aggressively BUG_ON iff CONFIG_EROFS_FS_DEBUG is on */
|
||||
DBG_BUGON(err < 0 && err != -ENOMEM);
|
||||
return err;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user