[PATCH] fs/erofs: Introduce new features including ztailpacking, fragments and dedupe
Huang Jianan
jnhuang95 at gmail.com
Tue Jul 11 05:12:21 CEST 2023
在 2023/7/7 23:52, Yifan Zhao 写道:
> This patch updates erofs driver code to catch up with the latest code of
> erofs_utils (commit e4939f9eaa177e05d697ace85d8dc283e25dc2ed).
>
> LZMA will be supported in the separate patch later.
>
> Signed-off-by: Yifan Zhao <zhaoyifan at sjtu.edu.cn>
Looks good to me.
Reviewed-by: Huang Jianan <jnhuang95 at gmail.com>
Thanks,
Jianan
> ---
> CI result here:
> https://github.com/u-boot/u-boot/pull/344
>
> fs/erofs/data.c | 165 ++++++++++++++---------
> fs/erofs/decompress.c | 32 ++++-
> fs/erofs/decompress.h | 3 +
> fs/erofs/erofs_fs.h | 301 +++++++++++++++++++++++-------------------
> fs/erofs/fs.c | 12 +-
> fs/erofs/internal.h | 119 ++++++++++++++---
> fs/erofs/namei.c | 44 +++---
> fs/erofs/super.c | 33 ++---
> fs/erofs/zmap.c | 277 +++++++++++++++++++++++++-------------
> 9 files changed, 642 insertions(+), 344 deletions(-)
>
> diff --git a/fs/erofs/data.c b/fs/erofs/data.c
> index 761896054c..f4b21d7917 100644
> --- a/fs/erofs/data.c
> +++ b/fs/erofs/data.c
> @@ -12,23 +12,23 @@ static int erofs_map_blocks_flatmode(struct erofs_inode *inode,
> struct erofs_inode *vi = inode;
> bool tailendpacking = (vi->datalayout == EROFS_INODE_FLAT_INLINE);
>
> - nblocks = DIV_ROUND_UP(inode->i_size, EROFS_BLKSIZ);
> + nblocks = BLK_ROUND_UP(inode->i_size);
> lastblk = nblocks - tailendpacking;
>
> /* there is no hole in flatmode */
> map->m_flags = EROFS_MAP_MAPPED;
>
> - if (offset < blknr_to_addr(lastblk)) {
> - map->m_pa = blknr_to_addr(vi->u.i_blkaddr) + map->m_la;
> - map->m_plen = blknr_to_addr(lastblk) - offset;
> + if (offset < erofs_pos(lastblk)) {
> + map->m_pa = erofs_pos(vi->u.i_blkaddr) + map->m_la;
> + map->m_plen = erofs_pos(lastblk) - offset;
> } else if (tailendpacking) {
> /* 2 - inode inline B: inode, [xattrs], inline last blk... */
> map->m_pa = iloc(vi->nid) + vi->inode_isize +
> vi->xattr_isize + erofs_blkoff(map->m_la);
> map->m_plen = inode->i_size - offset;
>
> - /* inline data should be located in one meta block */
> - if (erofs_blkoff(map->m_pa) + map->m_plen > PAGE_SIZE) {
> + /* inline data should be located in the same meta block */
> + if (erofs_blkoff(map->m_pa) + map->m_plen > erofs_blksiz()) {
> erofs_err("inline data cross block boundary @ nid %" PRIu64,
> vi->nid);
> DBG_BUGON(1);
> @@ -55,7 +55,7 @@ int erofs_map_blocks(struct erofs_inode *inode,
> {
> struct erofs_inode *vi = inode;
> struct erofs_inode_chunk_index *idx;
> - u8 buf[EROFS_BLKSIZ];
> + u8 buf[EROFS_MAX_BLOCK_SIZE];
> u64 chunknr;
> unsigned int unit;
> erofs_off_t pos;
> @@ -87,7 +87,7 @@ int erofs_map_blocks(struct erofs_inode *inode,
>
> map->m_la = chunknr << vi->u.chunkbits;
> map->m_plen = min_t(erofs_off_t, 1UL << vi->u.chunkbits,
> - roundup(inode->i_size - map->m_la, EROFS_BLKSIZ));
> + roundup(inode->i_size - map->m_la, erofs_blksiz()));
>
> /* handle block map */
> if (!(vi->u.chunkformat & EROFS_CHUNK_FORMAT_INDEXES)) {
> @@ -96,7 +96,7 @@ int erofs_map_blocks(struct erofs_inode *inode,
> if (le32_to_cpu(*blkaddr) == EROFS_NULL_ADDR) {
> map->m_flags = 0;
> } else {
> - map->m_pa = blknr_to_addr(le32_to_cpu(*blkaddr));
> + map->m_pa = erofs_pos(le32_to_cpu(*blkaddr));
> map->m_flags = EROFS_MAP_MAPPED;
> }
> goto out;
> @@ -110,7 +110,7 @@ int erofs_map_blocks(struct erofs_inode *inode,
> default:
> map->m_deviceid = le16_to_cpu(idx->device_id) &
> sbi.device_id_mask;
> - map->m_pa = blknr_to_addr(le32_to_cpu(idx->blkaddr));
> + map->m_pa = erofs_pos(le32_to_cpu(idx->blkaddr));
> map->m_flags = EROFS_MAP_MAPPED;
> break;
> }
> @@ -119,23 +119,23 @@ out:
> return err;
> }
>
> -int erofs_map_dev(struct erofs_sb_info *sbi, struct erofs_map_dev *map)
> +int erofs_map_dev(struct erofs_map_dev *map)
> {
> struct erofs_device_info *dif;
> int id;
>
> if (map->m_deviceid) {
> - if (sbi->extra_devices < map->m_deviceid)
> + if (sbi.extra_devices < map->m_deviceid)
> return -ENODEV;
> - } else if (sbi->extra_devices) {
> - for (id = 0; id < sbi->extra_devices; ++id) {
> + } else if (sbi.extra_devices) {
> + for (id = 0; id < sbi.extra_devices; ++id) {
> erofs_off_t startoff, length;
>
> - dif = sbi->devs + id;
> + dif = sbi.devs + id;
> if (!dif->mapped_blkaddr)
> continue;
> - startoff = blknr_to_addr(dif->mapped_blkaddr);
> - length = blknr_to_addr(dif->blocks);
> + startoff = erofs_pos(dif->mapped_blkaddr);
> + length = erofs_pos(dif->blocks);
>
> if (map->m_pa >= startoff &&
> map->m_pa < startoff + length) {
> @@ -147,19 +147,38 @@ int erofs_map_dev(struct erofs_sb_info *sbi, struct erofs_map_dev *map)
> return 0;
> }
>
> +int erofs_read_one_data(struct erofs_map_blocks *map, char *buffer, u64 offset,
> + size_t len)
> +{
> + struct erofs_map_dev mdev;
> + int ret;
> +
> + mdev = (struct erofs_map_dev) {
> + .m_deviceid = map->m_deviceid,
> + .m_pa = map->m_pa,
> + };
> + ret = erofs_map_dev(&mdev);
> + if (ret)
> + return ret;
> +
> + ret = erofs_dev_read(mdev.m_deviceid, buffer, mdev.m_pa + offset, len);
> + if (ret < 0)
> + return -EIO;
> + return 0;
> +}
> +
> static int erofs_read_raw_data(struct erofs_inode *inode, char *buffer,
> erofs_off_t size, erofs_off_t offset)
> {
> struct erofs_map_blocks map = {
> .index = UINT_MAX,
> };
> - struct erofs_map_dev mdev;
> int ret;
> erofs_off_t ptr = offset;
>
> while (ptr < offset + size) {
> char *const estart = buffer + ptr - offset;
> - erofs_off_t eend;
> + erofs_off_t eend, moff = 0;
>
> map.m_la = ptr;
> ret = erofs_map_blocks(inode, &map, 0);
> @@ -168,14 +187,6 @@ static int erofs_read_raw_data(struct erofs_inode *inode, char *buffer,
>
> DBG_BUGON(map.m_plen != map.m_llen);
>
> - mdev = (struct erofs_map_dev) {
> - .m_deviceid = map.m_deviceid,
> - .m_pa = map.m_pa,
> - };
> - ret = erofs_map_dev(&sbi, &mdev);
> - if (ret)
> - return ret;
> -
> /* trim extent */
> eend = min(offset + size, map.m_la + map.m_llen);
> DBG_BUGON(ptr < map.m_la);
> @@ -193,19 +204,73 @@ static int erofs_read_raw_data(struct erofs_inode *inode, char *buffer,
> }
>
> if (ptr > map.m_la) {
> - mdev.m_pa += ptr - map.m_la;
> + moff = ptr - map.m_la;
> map.m_la = ptr;
> }
>
> - ret = erofs_dev_read(mdev.m_deviceid, estart, mdev.m_pa,
> - eend - map.m_la);
> - if (ret < 0)
> - return -EIO;
> + ret = erofs_read_one_data(&map, estart, moff, eend - map.m_la);
> + if (ret)
> + return ret;
> ptr = eend;
> }
> return 0;
> }
>
> +int z_erofs_read_one_data(struct erofs_inode *inode,
> + struct erofs_map_blocks *map, char *raw, char *buffer,
> + erofs_off_t skip, erofs_off_t length, bool trimmed)
> +{
> + struct erofs_map_dev mdev;
> + int ret = 0;
> +
> + if (map->m_flags & EROFS_MAP_FRAGMENT) {
> + struct erofs_inode packed_inode = {
> + .nid = sbi.packed_nid,
> + };
> +
> + ret = erofs_read_inode_from_disk(&packed_inode);
> + if (ret) {
> + erofs_err("failed to read packed inode from disk");
> + return ret;
> + }
> +
> + return erofs_pread(&packed_inode, buffer, length - skip,
> + inode->fragmentoff + skip);
> + }
> +
> + /* no device id here, thus it will always succeed */
> + mdev = (struct erofs_map_dev) {
> + .m_pa = map->m_pa,
> + };
> + ret = erofs_map_dev(&mdev);
> + if (ret) {
> + DBG_BUGON(1);
> + return ret;
> + }
> +
> + ret = erofs_dev_read(mdev.m_deviceid, raw, mdev.m_pa, map->m_plen);
> + if (ret < 0)
> + return ret;
> +
> + ret = z_erofs_decompress(&(struct z_erofs_decompress_req) {
> + .in = raw,
> + .out = buffer,
> + .decodedskip = skip,
> + .interlaced_offset =
> + map->m_algorithmformat == Z_EROFS_COMPRESSION_INTERLACED ?
> + erofs_blkoff(map->m_la) : 0,
> + .inputsize = map->m_plen,
> + .decodedlength = length,
> + .alg = map->m_algorithmformat,
> + .partial_decoding = trimmed ? true :
> + !(map->m_flags & EROFS_MAP_FULL_MAPPED) ||
> + (map->m_flags & EROFS_MAP_PARTIAL_REF),
> + });
> + if (ret < 0)
> + return ret;
> + return 0;
> +}
> +
> static int z_erofs_read_data(struct erofs_inode *inode, char *buffer,
> erofs_off_t size, erofs_off_t offset)
> {
> @@ -213,8 +278,7 @@ static int z_erofs_read_data(struct erofs_inode *inode, char *buffer,
> struct erofs_map_blocks map = {
> .index = UINT_MAX,
> };
> - struct erofs_map_dev mdev;
> - bool partial;
> + bool trimmed;
> unsigned int bufsize = 0;
> char *raw = NULL;
> int ret = 0;
> @@ -227,27 +291,17 @@ static int z_erofs_read_data(struct erofs_inode *inode, char *buffer,
> if (ret)
> break;
>
> - /* no device id here, thus it will always succeed */
> - mdev = (struct erofs_map_dev) {
> - .m_pa = map.m_pa,
> - };
> - ret = erofs_map_dev(&sbi, &mdev);
> - if (ret) {
> - DBG_BUGON(1);
> - break;
> - }
> -
> /*
> * trim to the needed size if the returned extent is quite
> * larger than requested, and set up partial flag as well.
> */
> if (end < map.m_la + map.m_llen) {
> length = end - map.m_la;
> - partial = true;
> + trimmed = true;
> } else {
> DBG_BUGON(end != map.m_la + map.m_llen);
> length = map.m_llen;
> - partial = !(map.m_flags & EROFS_MAP_FULL_MAPPED);
> + trimmed = false;
> }
>
> if (map.m_la < offset) {
> @@ -272,19 +326,10 @@ static int z_erofs_read_data(struct erofs_inode *inode, char *buffer,
> break;
> }
> }
> - ret = erofs_dev_read(mdev.m_deviceid, raw, mdev.m_pa, map.m_plen);
> - if (ret < 0)
> - break;
>
> - ret = z_erofs_decompress(&(struct z_erofs_decompress_req) {
> - .in = raw,
> - .out = buffer + end - offset,
> - .decodedskip = skip,
> - .inputsize = map.m_plen,
> - .decodedlength = length,
> - .alg = map.m_algorithmformat,
> - .partial_decoding = partial
> - });
> + ret = z_erofs_read_one_data(inode, &map, raw,
> + buffer + end - offset, skip, length,
> + trimmed);
> if (ret < 0)
> break;
> }
> @@ -301,8 +346,8 @@ int erofs_pread(struct erofs_inode *inode, char *buf,
> case EROFS_INODE_FLAT_INLINE:
> case EROFS_INODE_CHUNK_BASED:
> return erofs_read_raw_data(inode, buf, count, offset);
> - case EROFS_INODE_FLAT_COMPRESSION_LEGACY:
> - case EROFS_INODE_FLAT_COMPRESSION:
> + case EROFS_INODE_COMPRESSED_FULL:
> + case EROFS_INODE_COMPRESSED_COMPACT:
> return z_erofs_read_data(inode, buf, count, offset);
> default:
> break;
> diff --git a/fs/erofs/decompress.c b/fs/erofs/decompress.c
> index 2be3b844cf..e04e5c34a8 100644
> --- a/fs/erofs/decompress.c
> +++ b/fs/erofs/decompress.c
> @@ -15,8 +15,8 @@ static int z_erofs_decompress_lz4(struct z_erofs_decompress_req *rq)
> if (erofs_sb_has_lz4_0padding()) {
> support_0padding = true;
>
> - while (!src[inputmargin & ~PAGE_MASK])
> - if (!(++inputmargin & ~PAGE_MASK))
> + while (!src[inputmargin & (erofs_blksiz() - 1)])
> + if (!(++inputmargin & (erofs_blksiz() - 1)))
> break;
>
> if (inputmargin >= rq->inputsize)
> @@ -40,6 +40,9 @@ static int z_erofs_decompress_lz4(struct z_erofs_decompress_req *rq)
> rq->decodedlength);
>
> if (ret != (int)rq->decodedlength) {
> + erofs_err("failed to %s decompress %d in[%u, %u] out[%u]",
> + rq->partial_decoding ? "partial" : "full",
> + ret, rq->inputsize, inputmargin, rq->decodedlength);
> ret = -EIO;
> goto out;
> }
> @@ -58,13 +61,30 @@ out:
>
> int z_erofs_decompress(struct z_erofs_decompress_req *rq)
> {
> - if (rq->alg == Z_EROFS_COMPRESSION_SHIFTED) {
> - if (rq->inputsize != EROFS_BLKSIZ)
> + if (rq->alg == Z_EROFS_COMPRESSION_INTERLACED) {
> + unsigned int count, rightpart, skip;
> +
> + /* XXX: should support inputsize >= erofs_blksiz() later */
> + if (rq->inputsize > erofs_blksiz())
> return -EFSCORRUPTED;
>
> - DBG_BUGON(rq->decodedlength > EROFS_BLKSIZ);
> - DBG_BUGON(rq->decodedlength < rq->decodedskip);
> + if (rq->decodedlength > erofs_blksiz())
> + return -EFSCORRUPTED;
> +
> + if (rq->decodedlength < rq->decodedskip)
> + return -EFSCORRUPTED;
>
> + count = rq->decodedlength - rq->decodedskip;
> + skip = erofs_blkoff(rq->interlaced_offset + rq->decodedskip);
> + rightpart = min(erofs_blksiz() - skip, count);
> + memcpy(rq->out, rq->in + skip, rightpart);
> + memcpy(rq->out + rightpart, rq->in, count - rightpart);
> + return 0;
> + } else if (rq->alg == Z_EROFS_COMPRESSION_SHIFTED) {
> + if (rq->decodedlength > rq->inputsize)
> + return -EFSCORRUPTED;
> +
> + DBG_BUGON(rq->decodedlength < rq->decodedskip);
> memcpy(rq->out, rq->in + rq->decodedskip,
> rq->decodedlength - rq->decodedskip);
> return 0;
> diff --git a/fs/erofs/decompress.h b/fs/erofs/decompress.h
> index 81d5fb84f6..4752f77950 100644
> --- a/fs/erofs/decompress.h
> +++ b/fs/erofs/decompress.h
> @@ -14,6 +14,9 @@ struct z_erofs_decompress_req {
> unsigned int decodedskip;
> unsigned int inputsize, decodedlength;
>
> + /* cut point of interlaced uncompressed data */
> + unsigned int interlaced_offset;
> +
> /* indicate the algorithm will be used for decompression */
> unsigned int alg;
> bool partial_decoding;
> diff --git a/fs/erofs/erofs_fs.h b/fs/erofs/erofs_fs.h
> index 6b62c7a4f5..158e2c68a1 100644
> --- a/fs/erofs/erofs_fs.h
> +++ b/fs/erofs/erofs_fs.h
> @@ -3,7 +3,7 @@
> * EROFS (Enhanced ROM File System) on-disk format definition
> *
> * Copyright (C) 2017-2018 HUAWEI, Inc.
> - * http://www.huawei.com/
> + * https://www.huawei.com/
> * Copyright (C) 2021, Alibaba Cloud
> */
> #ifndef __EROFS_FS_H
> @@ -18,33 +18,41 @@
> #define EROFS_SUPER_MAGIC_V1 0xE0F5E1E2
> #define EROFS_SUPER_OFFSET 1024
>
> -#define EROFS_FEATURE_COMPAT_SB_CHKSUM 0x00000001
> +#define EROFS_FEATURE_COMPAT_SB_CHKSUM 0x00000001
> +#define EROFS_FEATURE_COMPAT_MTIME 0x00000002
>
> /*
> * Any bits that aren't in EROFS_ALL_FEATURE_INCOMPAT should
> * be incompatible with this kernel version.
> */
> -#define EROFS_FEATURE_INCOMPAT_LZ4_0PADDING 0x00000001
> +#define EROFS_FEATURE_INCOMPAT_ZERO_PADDING 0x00000001
> #define EROFS_FEATURE_INCOMPAT_COMPR_CFGS 0x00000002
> #define EROFS_FEATURE_INCOMPAT_BIG_PCLUSTER 0x00000002
> #define EROFS_FEATURE_INCOMPAT_CHUNKED_FILE 0x00000004
> #define EROFS_FEATURE_INCOMPAT_DEVICE_TABLE 0x00000008
> +#define EROFS_FEATURE_INCOMPAT_COMPR_HEAD2 0x00000008
> +#define EROFS_FEATURE_INCOMPAT_ZTAILPACKING 0x00000010
> +#define EROFS_FEATURE_INCOMPAT_FRAGMENTS 0x00000020
> +#define EROFS_FEATURE_INCOMPAT_DEDUPE 0x00000020
> +#define EROFS_FEATURE_INCOMPAT_XATTR_PREFIXES 0x00000040
> #define EROFS_ALL_FEATURE_INCOMPAT \
> - (EROFS_FEATURE_INCOMPAT_LZ4_0PADDING | \
> + (EROFS_FEATURE_INCOMPAT_ZERO_PADDING | \
> EROFS_FEATURE_INCOMPAT_COMPR_CFGS | \
> EROFS_FEATURE_INCOMPAT_BIG_PCLUSTER | \
> EROFS_FEATURE_INCOMPAT_CHUNKED_FILE | \
> - EROFS_FEATURE_INCOMPAT_DEVICE_TABLE)
> + EROFS_FEATURE_INCOMPAT_DEVICE_TABLE | \
> + EROFS_FEATURE_INCOMPAT_COMPR_HEAD2 | \
> + EROFS_FEATURE_INCOMPAT_ZTAILPACKING | \
> + EROFS_FEATURE_INCOMPAT_FRAGMENTS | \
> + EROFS_FEATURE_INCOMPAT_DEDUPE | \
> + EROFS_FEATURE_INCOMPAT_XATTR_PREFIXES)
>
> #define EROFS_SB_EXTSLOT_SIZE 16
>
> struct erofs_deviceslot {
> - union {
> - u8 uuid[16]; /* used for device manager later */
> - u8 userdata[64]; /* digest(sha256), etc. */
> - } u;
> - __le32 blocks; /* total fs blocks of this device */
> - __le32 mapped_blkaddr; /* map starting at mapped_blkaddr */
> + u8 tag[64]; /* digest(sha256), etc. */
> + __le32 blocks; /* total fs blocks of this device */
> + __le32 mapped_blkaddr; /* map starting at mapped_blkaddr */
> u8 reserved[56];
> };
>
> @@ -55,14 +63,14 @@ struct erofs_super_block {
> __le32 magic; /* file system magic number */
> __le32 checksum; /* crc32c(super_block) */
> __le32 feature_compat;
> - __u8 blkszbits; /* support block_size == PAGE_SIZE only */
> + __u8 blkszbits; /* filesystem block size in bit shift */
> __u8 sb_extslots; /* superblock size = 128 + sb_extslots * 16 */
>
> __le16 root_nid; /* nid of root directory */
> __le64 inos; /* total valid ino # (== f_files - f_favail) */
>
> - __le64 build_time; /* inode v1 time derivation */
> - __le32 build_time_nsec; /* inode v1 time derivation in nano scale */
> + __le64 build_time; /* compact inode time derivation */
> + __le32 build_time_nsec; /* compact inode time derivation in ns scale */
> __le32 blocks; /* used for statfs */
> __le32 meta_blkaddr; /* start block address of metadata area */
> __le32 xattr_blkaddr; /* start block address of shared xattr area */
> @@ -77,39 +85,38 @@ struct erofs_super_block {
> } __packed u1;
> __le16 extra_devices; /* # of devices besides the primary device */
> __le16 devt_slotoff; /* startoff = devt_slotoff * devt_slotsize */
> - __u8 reserved2[38];
> + __u8 dirblkbits; /* directory block size in bit shift */
> + __u8 xattr_prefix_count; /* # of long xattr name prefixes */
> + __le32 xattr_prefix_start; /* start of long xattr prefixes */
> + __le64 packed_nid; /* nid of the special packed inode */
> + __u8 reserved2[24];
> };
>
> /*
> - * erofs inode datalayout (i_format in on-disk inode):
> - * 0 - inode plain without inline data A:
> - * inode, [xattrs], ... | ... | no-holed data
> - * 1 - inode VLE compression B (legacy):
> - * inode, [xattrs], extents ... | ...
> - * 2 - inode plain with inline data C:
> - * inode, [xattrs], last_inline_data, ... | ... | no-holed data
> - * 3 - inode compression D:
> - * inode, [xattrs], map_header, extents ... | ...
> - * 4 - inode chunk-based E:
> - * inode, [xattrs], chunk indexes ... | ...
> + * EROFS inode datalayout (i_format in on-disk inode):
> + * 0 - uncompressed flat inode without tail-packing inline data:
> + * 1 - compressed inode with non-compact indexes:
> + * 2 - uncompressed flat inode with tail-packing inline data:
> + * 3 - compressed inode with compact indexes:
> + * 4 - chunk-based inode with (optional) multi-device support:
> * 5~7 - reserved
> */
> enum {
> EROFS_INODE_FLAT_PLAIN = 0,
> - EROFS_INODE_FLAT_COMPRESSION_LEGACY = 1,
> + EROFS_INODE_COMPRESSED_FULL = 1,
> EROFS_INODE_FLAT_INLINE = 2,
> - EROFS_INODE_FLAT_COMPRESSION = 3,
> + EROFS_INODE_COMPRESSED_COMPACT = 3,
> EROFS_INODE_CHUNK_BASED = 4,
> EROFS_INODE_DATALAYOUT_MAX
> };
>
> static inline bool erofs_inode_is_data_compressed(unsigned int datamode)
> {
> - return datamode == EROFS_INODE_FLAT_COMPRESSION ||
> - datamode == EROFS_INODE_FLAT_COMPRESSION_LEGACY;
> + return datamode == EROFS_INODE_COMPRESSED_COMPACT ||
> + datamode == EROFS_INODE_COMPRESSED_FULL;
> }
>
> -/* bit definitions of inode i_advise */
> +/* bit definitions of inode i_format */
> #define EROFS_I_VERSION_BITS 1
> #define EROFS_I_DATALAYOUT_BITS 3
>
> @@ -127,11 +134,30 @@ static inline bool erofs_inode_is_data_compressed(unsigned int datamode)
> #define EROFS_CHUNK_FORMAT_ALL \
> (EROFS_CHUNK_FORMAT_BLKBITS_MASK | EROFS_CHUNK_FORMAT_INDEXES)
>
> +/* 32-byte on-disk inode */
> +#define EROFS_INODE_LAYOUT_COMPACT 0
> +/* 64-byte on-disk inode */
> +#define EROFS_INODE_LAYOUT_EXTENDED 1
> +
> struct erofs_inode_chunk_info {
> __le16 format; /* chunk blkbits, etc. */
> __le16 reserved;
> };
>
> +union erofs_inode_i_u {
> + /* total compressed blocks for compressed inodes */
> + __le32 compressed_blocks;
> +
> + /* block address for uncompressed flat inodes */
> + __le32 raw_blkaddr;
> +
> + /* for device files, used to indicate old/new device # */
> + __le32 rdev;
> +
> + /* for chunk-based files, it contains the summary info */
> + struct erofs_inode_chunk_info c;
> +};
> +
> /* 32-byte reduced form of an ondisk inode */
> struct erofs_inode_compact {
> __le16 i_format; /* inode format hints */
> @@ -142,28 +168,14 @@ struct erofs_inode_compact {
> __le16 i_nlink;
> __le32 i_size;
> __le32 i_reserved;
> - union {
> - /* file total compressed blocks for data mapping 1 */
> - __le32 compressed_blocks;
> - __le32 raw_blkaddr;
> + union erofs_inode_i_u i_u;
>
> - /* for device files, used to indicate old/new device # */
> - __le32 rdev;
> -
> - /* for chunk-based files, it contains the summary info */
> - struct erofs_inode_chunk_info c;
> - } i_u;
> - __le32 i_ino; /* only used for 32-bit stat compatibility */
> + __le32 i_ino; /* only used for 32-bit stat compatibility */
> __le16 i_uid;
> __le16 i_gid;
> __le32 i_reserved2;
> };
>
> -/* 32 bytes on-disk inode */
> -#define EROFS_INODE_LAYOUT_COMPACT 0
> -/* 64 bytes on-disk inode */
> -#define EROFS_INODE_LAYOUT_EXTENDED 1
> -
> /* 64-byte complete form of an ondisk inode */
> struct erofs_inode_extended {
> __le16 i_format; /* inode format hints */
> @@ -173,33 +185,17 @@ struct erofs_inode_extended {
> __le16 i_mode;
> __le16 i_reserved;
> __le64 i_size;
> - union {
> - /* file total compressed blocks for data mapping 1 */
> - __le32 compressed_blocks;
> - __le32 raw_blkaddr;
> -
> - /* for device files, used to indicate old/new device # */
> - __le32 rdev;
> -
> - /* for chunk-based files, it contains the summary info */
> - struct erofs_inode_chunk_info c;
> - } i_u;
> -
> - /* only used for 32-bit stat compatibility */
> - __le32 i_ino;
> + union erofs_inode_i_u i_u;
>
> + __le32 i_ino; /* only used for 32-bit stat compatibility */
> __le32 i_uid;
> __le32 i_gid;
> - __le64 i_ctime;
> - __le32 i_ctime_nsec;
> + __le64 i_mtime;
> + __le32 i_mtime_nsec;
> __le32 i_nlink;
> __u8 i_reserved2[16];
> };
>
> -#define EROFS_MAX_SHARED_XATTRS (128)
> -/* h_shared_count between 129 ... 255 are special # */
> -#define EROFS_SHARED_XATTR_EXTENT (255)
> -
> /*
> * inline xattrs (n == i_xattr_icount):
> * erofs_xattr_ibody_header(1) + (n - 1) * 4 bytes
> @@ -226,6 +222,13 @@ struct erofs_xattr_ibody_header {
> #define EROFS_XATTR_INDEX_LUSTRE 5
> #define EROFS_XATTR_INDEX_SECURITY 6
>
> +/*
> + * bit 7 of e_name_index is set when it refers to a long xattr name prefix,
> + * while the remained lower bits represent the index of the prefix.
> + */
> +#define EROFS_XATTR_LONG_PREFIX 0x80
> +#define EROFS_XATTR_LONG_PREFIX_MASK 0x7f
> +
> /* xattr entry (for both inline & shared xattrs) */
> struct erofs_xattr_entry {
> __u8 e_name_len; /* length of name */
> @@ -235,6 +238,12 @@ struct erofs_xattr_entry {
> char e_name[0]; /* attribute name */
> };
>
> +/* long xattr name prefix */
> +struct erofs_xattr_long_prefix {
> + __u8 base_index; /* short xattr name prefix index */
> + char infix[0]; /* infix apart from short prefix */
> +};
> +
> static inline unsigned int erofs_xattr_ibody_size(__le16 i_xattr_icount)
> {
> if (!i_xattr_icount)
> @@ -265,6 +274,29 @@ struct erofs_inode_chunk_index {
> __le32 blkaddr; /* start block address of this inode chunk */
> };
>
> +/* dirent sorts in alphabet order, thus we can do binary search */
> +struct erofs_dirent {
> + __le64 nid; /* node number */
> + __le16 nameoff; /* start offset of file name */
> + __u8 file_type; /* file type */
> + __u8 reserved; /* reserved */
> +} __packed;
> +
> +/* file types used in inode_info->flags */
> +enum {
> + EROFS_FT_UNKNOWN,
> + EROFS_FT_REG_FILE,
> + EROFS_FT_DIR,
> + EROFS_FT_CHRDEV,
> + EROFS_FT_BLKDEV,
> + EROFS_FT_FIFO,
> + EROFS_FT_SOCK,
> + EROFS_FT_SYMLINK,
> + EROFS_FT_MAX
> +};
> +
> +#define EROFS_NAME_LEN 255
> +
> /* maximum supported size of a physical compression cluster */
> #define Z_EROFS_PCLUSTER_MAX_SIZE (1024 * 1024)
>
> @@ -275,7 +307,7 @@ enum {
> Z_EROFS_COMPRESSION_MAX
> };
>
> -#define Z_EROFS_ALL_COMPR_ALGS (1 << (Z_EROFS_COMPRESSION_MAX - 1))
> +#define Z_EROFS_ALL_COMPR_ALGS ((1 << Z_EROFS_COMPRESSION_MAX) - 1)
>
> /* 14 bytes (+ length field = 16 bytes) */
> struct z_erofs_lz4_cfgs {
> @@ -290,6 +322,7 @@ struct z_erofs_lzma_cfgs {
> __le16 format;
> u8 reserved[8];
> } __packed;
> +
> #define Z_EROFS_LZMA_MAX_DICT_SIZE (8 * Z_EROFS_PCLUSTER_MAX_SIZE)
>
> /*
> @@ -298,13 +331,28 @@ struct z_erofs_lzma_cfgs {
> * (4B) + 2B + (4B) if compacted 2B is on.
> * bit 1 : HEAD1 big pcluster (0 - off; 1 - on)
> * bit 2 : HEAD2 big pcluster (0 - off; 1 - on)
> + * bit 3 : tailpacking inline pcluster (0 - off; 1 - on)
> + * bit 4 : interlaced plain pcluster (0 - off; 1 - on)
> + * bit 5 : fragment pcluster (0 - off; 1 - on)
> */
> #define Z_EROFS_ADVISE_COMPACTED_2B 0x0001
> #define Z_EROFS_ADVISE_BIG_PCLUSTER_1 0x0002
> #define Z_EROFS_ADVISE_BIG_PCLUSTER_2 0x0004
> +#define Z_EROFS_ADVISE_INLINE_PCLUSTER 0x0008
> +#define Z_EROFS_ADVISE_INTERLACED_PCLUSTER 0x0010
> +#define Z_EROFS_ADVISE_FRAGMENT_PCLUSTER 0x0020
>
> +#define Z_EROFS_FRAGMENT_INODE_BIT 7
> struct z_erofs_map_header {
> - __le32 h_reserved1;
> + union {
> + /* fragment data offset in the packed inode */
> + __le32 h_fragmentoff;
> + struct {
> + __le16 h_reserved1;
> + /* indicates the encoded size of tailpacking data */
> + __le16 h_idata_size;
> + };
> + };
> __le16 h_advise;
> /*
> * bit 0-3 : algorithm type of head 1 (logical cluster type 01);
> @@ -313,107 +361,85 @@ struct z_erofs_map_header {
> __u8 h_algorithmtype;
> /*
> * bit 0-2 : logical cluster bits - 12, e.g. 0 for 4096;
> - * bit 3-7 : reserved.
> + * bit 3-6 : reserved;
> + * bit 7 : move the whole file into packed inode or not.
> */
> __u8 h_clusterbits;
> };
>
> -#define Z_EROFS_VLE_LEGACY_HEADER_PADDING 8
> -
> /*
> - * Fixed-sized output compression ondisk Logical Extent cluster type:
> - * 0 - literal (uncompressed) cluster
> - * 1 - compressed cluster (for the head logical cluster)
> - * 2 - compressed cluster (for the other logical clusters)
> + * On-disk logical cluster type:
> + * 0 - literal (uncompressed) lcluster
> + * 1,3 - compressed lcluster (for HEAD lclusters)
> + * 2 - compressed lcluster (for NONHEAD lclusters)
> *
> * In detail,
> - * 0 - literal (uncompressed) cluster,
> + * 0 - literal (uncompressed) lcluster,
> * di_advise = 0
> - * di_clusterofs = the literal data offset of the cluster
> - * di_blkaddr = the blkaddr of the literal cluster
> + * di_clusterofs = the literal data offset of the lcluster
> + * di_blkaddr = the blkaddr of the literal pcluster
> *
> - * 1 - compressed cluster (for the head logical cluster)
> - * di_advise = 1
> - * di_clusterofs = the decompressed data offset of the cluster
> - * di_blkaddr = the blkaddr of the compressed cluster
> + * 1,3 - compressed lcluster (for HEAD lclusters)
> + * di_advise = 1 or 3
> + * di_clusterofs = the decompressed data offset of the lcluster
> + * di_blkaddr = the blkaddr of the compressed pcluster
> *
> - * 2 - compressed cluster (for the other logical clusters)
> + * 2 - compressed lcluster (for NONHEAD lclusters)
> * di_advise = 2
> * di_clusterofs =
> - * the decompressed data offset in its own head cluster
> - * di_u.delta[0] = distance to its corresponding head cluster
> - * di_u.delta[1] = distance to its corresponding tail cluster
> - * (di_advise could be 0, 1 or 2)
> + * the decompressed data offset in its own HEAD lcluster
> + * di_u.delta[0] = distance to this HEAD lcluster
> + * di_u.delta[1] = distance to the next HEAD lcluster
> */
> enum {
> - Z_EROFS_VLE_CLUSTER_TYPE_PLAIN = 0,
> - Z_EROFS_VLE_CLUSTER_TYPE_HEAD = 1,
> - Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD = 2,
> - Z_EROFS_VLE_CLUSTER_TYPE_RESERVED = 3,
> - Z_EROFS_VLE_CLUSTER_TYPE_MAX
> + Z_EROFS_LCLUSTER_TYPE_PLAIN = 0,
> + Z_EROFS_LCLUSTER_TYPE_HEAD1 = 1,
> + Z_EROFS_LCLUSTER_TYPE_NONHEAD = 2,
> + Z_EROFS_LCLUSTER_TYPE_HEAD2 = 3,
> + Z_EROFS_LCLUSTER_TYPE_MAX
> };
>
> -#define Z_EROFS_VLE_DI_CLUSTER_TYPE_BITS 2
> -#define Z_EROFS_VLE_DI_CLUSTER_TYPE_BIT 0
> +#define Z_EROFS_LI_LCLUSTER_TYPE_BITS 2
> +#define Z_EROFS_LI_LCLUSTER_TYPE_BIT 0
> +
> +/* (noncompact only, HEAD) This pcluster refers to partial decompressed data */
> +#define Z_EROFS_LI_PARTIAL_REF (1 << 15)
>
> /*
> * D0_CBLKCNT will be marked _only_ at the 1st non-head lcluster to store the
> * compressed block count of a compressed extent (in logical clusters, aka.
> * block count of a pcluster).
> */
> -#define Z_EROFS_VLE_DI_D0_CBLKCNT (1 << 11)
> +#define Z_EROFS_LI_D0_CBLKCNT (1 << 11)
>
> -struct z_erofs_vle_decompressed_index {
> +struct z_erofs_lcluster_index {
> __le16 di_advise;
> - /* where to decompress in the head cluster */
> + /* where to decompress in the head lcluster */
> __le16 di_clusterofs;
>
> union {
> - /* for the head cluster */
> + /* for the HEAD lclusters */
> __le32 blkaddr;
> /*
> - * for the rest clusters
> - * eg. for 4k page-sized cluster, maximum 4K*64k = 256M)
> - * [0] - pointing to the head cluster
> - * [1] - pointing to the tail cluster
> + * for the NONHEAD lclusters
> + * [0] - distance to its HEAD lcluster
> + * [1] - distance to the next HEAD lcluster
> */
> __le16 delta[2];
> } di_u;
> };
>
> -#define Z_EROFS_VLE_LEGACY_INDEX_ALIGN(size) \
> - (round_up(size, sizeof(struct z_erofs_vle_decompressed_index)) + \
> - sizeof(struct z_erofs_map_header) + Z_EROFS_VLE_LEGACY_HEADER_PADDING)
> -
> -#define Z_EROFS_VLE_EXTENT_ALIGN(size) round_up(size, \
> - sizeof(struct z_erofs_vle_decompressed_index))
> -
> -/* dirent sorts in alphabet order, thus we can do binary search */
> -struct erofs_dirent {
> - __le64 nid; /* node number */
> - __le16 nameoff; /* start offset of file name */
> - __u8 file_type; /* file type */
> - __u8 reserved; /* reserved */
> -} __packed;
> -
> -/* file types used in inode_info->flags */
> -enum {
> - EROFS_FT_UNKNOWN,
> - EROFS_FT_REG_FILE,
> - EROFS_FT_DIR,
> - EROFS_FT_CHRDEV,
> - EROFS_FT_BLKDEV,
> - EROFS_FT_FIFO,
> - EROFS_FT_SOCK,
> - EROFS_FT_SYMLINK,
> - EROFS_FT_MAX
> -};
> -
> -#define EROFS_NAME_LEN 255
> +#define Z_EROFS_FULL_INDEX_ALIGN(end) \
> + (round_up(end, 8) + sizeof(struct z_erofs_map_header) + 8)
>
> /* check the EROFS on-disk layout strictly at compile time */
> static inline void erofs_check_ondisk_layout_definitions(void)
> {
> + const __le64 fmh __maybe_unused =
> + *(__le64 *)&(struct z_erofs_map_header) {
> + .h_clusterbits = 1 << Z_EROFS_FRAGMENT_INODE_BIT
> + };
> +
> BUILD_BUG_ON(sizeof(struct erofs_super_block) != 128);
> BUILD_BUG_ON(sizeof(struct erofs_inode_compact) != 32);
> BUILD_BUG_ON(sizeof(struct erofs_inode_extended) != 64);
> @@ -422,15 +448,18 @@ static inline void erofs_check_ondisk_layout_definitions(void)
> BUILD_BUG_ON(sizeof(struct erofs_inode_chunk_info) != 4);
> BUILD_BUG_ON(sizeof(struct erofs_inode_chunk_index) != 8);
> BUILD_BUG_ON(sizeof(struct z_erofs_map_header) != 8);
> - BUILD_BUG_ON(sizeof(struct z_erofs_vle_decompressed_index) != 8);
> + BUILD_BUG_ON(sizeof(struct z_erofs_lcluster_index) != 8);
> BUILD_BUG_ON(sizeof(struct erofs_dirent) != 12);
> /* keep in sync between 2 index structures for better extendibility */
> BUILD_BUG_ON(sizeof(struct erofs_inode_chunk_index) !=
> - sizeof(struct z_erofs_vle_decompressed_index));
> + sizeof(struct z_erofs_lcluster_index));
> BUILD_BUG_ON(sizeof(struct erofs_deviceslot) != 128);
>
> - BUILD_BUG_ON(BIT(Z_EROFS_VLE_DI_CLUSTER_TYPE_BITS) <
> - Z_EROFS_VLE_CLUSTER_TYPE_MAX - 1);
> + BUILD_BUG_ON(BIT(Z_EROFS_LI_LCLUSTER_TYPE_BITS) <
> + Z_EROFS_LCLUSTER_TYPE_MAX - 1);
> + /* exclude old compiler versions like gcc 7.5.0 */
> + BUILD_BUG_ON(__builtin_constant_p(fmh) ?
> + fmh != cpu_to_le64(1ULL << 63) : 0);
> }
>
> #endif
> diff --git a/fs/erofs/fs.c b/fs/erofs/fs.c
> index 89269750f8..7bd2e8fcfc 100644
> --- a/fs/erofs/fs.c
> +++ b/fs/erofs/fs.c
> @@ -25,8 +25,8 @@ int erofs_dev_read(int device_id, void *buf, u64 offset, size_t len)
>
> int erofs_blk_read(void *buf, erofs_blk_t start, u32 nblocks)
> {
> - return erofs_dev_read(0, buf, blknr_to_addr(start),
> - blknr_to_addr(nblocks));
> + return erofs_dev_read(0, buf, erofs_pos(start),
> + erofs_pos(nblocks));
> }
>
> int erofs_probe(struct blk_desc *fs_dev_desc,
> @@ -52,7 +52,7 @@ struct erofs_dir_stream {
> struct fs_dirent dirent;
>
> struct erofs_inode inode;
> - char dblk[EROFS_BLKSIZ];
> + char dblk[EROFS_MAX_BLOCK_SIZE];
> unsigned int maxsize, de_end;
> erofs_off_t pos;
> };
> @@ -125,7 +125,7 @@ int erofs_readdir(struct fs_dir_stream *fs_dirs, struct fs_dirent **dentp)
> return 1;
>
> if (!dirs->maxsize) {
> - dirs->maxsize = min_t(unsigned int, EROFS_BLKSIZ,
> + dirs->maxsize = min_t(unsigned int, EROFS_MAX_BLOCK_SIZE,
> dirs->inode.i_size - pos);
>
> err = erofs_pread(&dirs->inode, dirs->dblk,
> @@ -136,7 +136,7 @@ int erofs_readdir(struct fs_dir_stream *fs_dirs, struct fs_dirent **dentp)
> de = (struct erofs_dirent *)dirs->dblk;
> dirs->de_end = le16_to_cpu(de->nameoff);
> if (dirs->de_end < sizeof(struct erofs_dirent) ||
> - dirs->de_end >= EROFS_BLKSIZ) {
> + dirs->de_end >= EROFS_MAX_BLOCK_SIZE) {
> erofs_err("invalid de[0].nameoff %u @ nid %llu",
> dirs->de_end, de->nid | 0ULL);
> return -EFSCORRUPTED;
> @@ -183,7 +183,7 @@ int erofs_readdir(struct fs_dir_stream *fs_dirs, struct fs_dirent **dentp)
>
> pos += sizeof(*de);
> if (erofs_blkoff(pos) >= dirs->de_end) {
> - pos = blknr_to_addr(erofs_blknr(pos) + 1);
> + pos = erofs_pos(erofs_blknr(pos) + 1);
> dirs->maxsize = 0;
> }
> dirs->pos = pos;
> diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
> index 4af7c91560..433a3c6c1e 100644
> --- a/fs/erofs/internal.h
> +++ b/fs/erofs/internal.h
> @@ -2,6 +2,7 @@
> #ifndef __EROFS_INTERNAL_H
> #define __EROFS_INTERNAL_H
>
> +#include "linux/compat.h"
> #define __packed __attribute__((__packed__))
>
> #include <linux/stat.h>
> @@ -30,8 +31,9 @@
>
> #define PAGE_MASK (~(PAGE_SIZE - 1))
>
> -#define LOG_BLOCK_SIZE (12)
> -#define EROFS_BLKSIZ (1U << LOG_BLOCK_SIZE)
> +#ifndef EROFS_MAX_BLOCK_SIZE
> +#define EROFS_MAX_BLOCK_SIZE PAGE_SIZE
> +#endif
>
> #define EROFS_ISLOTBITS 5
> #define EROFS_SLOTSIZE (1U << EROFS_ISLOTBITS)
> @@ -44,11 +46,15 @@ typedef u32 erofs_blk_t;
> #define NULL_ADDR ((unsigned int)-1)
> #define NULL_ADDR_UL ((unsigned long)-1)
>
> -#define erofs_blknr(addr) ((addr) / EROFS_BLKSIZ)
> -#define erofs_blkoff(addr) ((addr) % EROFS_BLKSIZ)
> -#define blknr_to_addr(nr) ((erofs_off_t)(nr) * EROFS_BLKSIZ)
> +/* global sbi */
> +extern struct erofs_sb_info sbi;
> +
> +#define erofs_blksiz() (1u << sbi.blkszbits)
> +#define erofs_blknr(addr) ((addr) >> sbi.blkszbits)
> +#define erofs_blkoff(addr) ((addr) & (erofs_blksiz() - 1))
> +#define erofs_pos(nr) ((erofs_off_t)(nr) << sbi.blkszbits)
>
> -#define BLK_ROUND_UP(addr) DIV_ROUND_UP(addr, EROFS_BLKSIZ)
> +#define BLK_ROUND_UP(addr) DIV_ROUND_UP(addr, 1u << sbi.blkszbits)
>
> struct erofs_buffer_head;
>
> @@ -57,6 +63,8 @@ struct erofs_device_info {
> u32 mapped_blkaddr;
> };
>
> +#define EROFS_PACKED_NID_UNALLOCATED -1
> +
> struct erofs_sb_info {
> struct erofs_device_info *devs;
>
> @@ -72,6 +80,7 @@ struct erofs_sb_info {
> u32 build_time_nsec;
>
> unsigned char islotbits;
> + unsigned char blkszbits;
>
> /* what we really care is nid, rather than ino.. */
> erofs_nid_t root_nid;
> @@ -79,23 +88,29 @@ struct erofs_sb_info {
> u64 inos;
>
> u8 uuid[16];
> + char volume_name[16];
>
> u16 available_compr_algs;
> u16 lz4_max_distance;
> +
> u32 checksum;
> u16 extra_devices;
> union {
> u16 devt_slotoff; /* used for mkfs */
> u16 device_id_mask; /* used for others */
> };
> + erofs_nid_t packed_nid;
> +
> + u32 xattr_prefix_start;
> + u8 xattr_prefix_count;
> };
>
> -/* global sbi */
> -extern struct erofs_sb_info sbi;
> +/* make sure that any user of the erofs headers has at least 64bit off_t type */
> +extern int erofs_assert_largefile[sizeof(off_t) - 8];
>
> static inline erofs_off_t iloc(erofs_nid_t nid)
> {
> - return blknr_to_addr(sbi.meta_blkaddr) + (nid << sbi.islotbits);
> + return erofs_pos(sbi.meta_blkaddr) + (nid << sbi.islotbits);
> }
>
> #define EROFS_FEATURE_FUNCS(name, compat, feature) \
> @@ -112,11 +127,15 @@ static inline void erofs_sb_clear_##name(void) \
> sbi.feature_##compat &= ~EROFS_FEATURE_##feature; \
> }
>
> -EROFS_FEATURE_FUNCS(lz4_0padding, incompat, INCOMPAT_LZ4_0PADDING)
> +EROFS_FEATURE_FUNCS(lz4_0padding, incompat, INCOMPAT_ZERO_PADDING)
> EROFS_FEATURE_FUNCS(compr_cfgs, incompat, INCOMPAT_COMPR_CFGS)
> EROFS_FEATURE_FUNCS(big_pcluster, incompat, INCOMPAT_BIG_PCLUSTER)
> EROFS_FEATURE_FUNCS(chunked_file, incompat, INCOMPAT_CHUNKED_FILE)
> EROFS_FEATURE_FUNCS(device_table, incompat, INCOMPAT_DEVICE_TABLE)
> +EROFS_FEATURE_FUNCS(ztailpacking, incompat, INCOMPAT_ZTAILPACKING)
> +EROFS_FEATURE_FUNCS(fragments, incompat, INCOMPAT_FRAGMENTS)
> +EROFS_FEATURE_FUNCS(dedupe, incompat, INCOMPAT_DEDUPE)
> +EROFS_FEATURE_FUNCS(xattr_prefixes, incompat, INCOMPAT_XATTR_PREFIXES)
> EROFS_FEATURE_FUNCS(sb_chksum, compat, COMPAT_SB_CHKSUM)
>
> #define EROFS_I_EA_INITED (1 << 0)
> @@ -130,6 +149,8 @@ struct erofs_inode {
> unsigned int flags;
> /* (mkfs.erofs) device ID containing source file */
> u32 dev;
> + /* (mkfs.erofs) queued sub-directories blocking dump */
> + u32 subdirs_queued;
> };
> unsigned int i_count;
> struct erofs_inode *i_parent;
> @@ -140,8 +161,8 @@ struct erofs_inode {
> u64 i_ino[2];
> u32 i_uid;
> u32 i_gid;
> - u64 i_ctime;
> - u32 i_ctime_nsec;
> + u64 i_mtime;
> + u32 i_mtime_nsec;
> u32 i_nlink;
>
> union {
> @@ -154,20 +175,31 @@ struct erofs_inode {
> };
> } u;
>
> + char *i_srcpath;
> +
> unsigned char datalayout;
> unsigned char inode_isize;
> /* inline tail-end packing size */
> unsigned short idata_size;
> + bool compressed_idata;
> + bool lazy_tailblock;
>
> unsigned int xattr_isize;
> unsigned int extent_isize;
>
> + unsigned int xattr_shared_count;
> + unsigned int *xattr_shared_xattrs;
> +
> erofs_nid_t nid;
> struct erofs_buffer_head *bh;
> struct erofs_buffer_head *bh_inline, *bh_data;
>
> void *idata;
>
> + /* (ztailpacking) in order to recover uncompressed EOF data */
> + void *eof_tailraw;
> + unsigned int eof_tailrawsize;
> +
> union {
> void *compressmeta;
> void *chunkindexes;
> @@ -176,8 +208,14 @@ struct erofs_inode {
> uint8_t z_algorithmtype[2];
> uint8_t z_logical_clusterbits;
> uint8_t z_physical_clusterblks;
> + uint64_t z_tailextent_headlcn;
> + unsigned int z_idataoff;
> +#define z_idata_size idata_size
> };
> };
> + uint64_t capabilities;
> + erofs_off_t fragmentoff;
> + unsigned int fragment_size;
> };
>
> static inline bool is_inode_layout_compression(struct erofs_inode *inode)
> @@ -216,6 +254,14 @@ struct erofs_dentry {
> };
> };
>
> +static inline bool is_dot_dotdot_len(const char *name, unsigned int len)
> +{
> + if (len >= 1 && name[0] != '.')
> + return false;
> +
> + return len == 1 || (len == 2 && name[1] == '.');
> +}
> +
> static inline bool is_dot_dotdot(const char *name)
> {
> if (name[0] != '.')
> @@ -229,6 +275,8 @@ enum {
> BH_Mapped,
> BH_Encoded,
> BH_FullMapped,
> + BH_Fragment,
> + BH_Partialref,
> };
>
> /* Has a disk mapping */
> @@ -239,9 +287,13 @@ enum {
> #define EROFS_MAP_ENCODED (1 << BH_Encoded)
> /* The length of extent is full */
> #define EROFS_MAP_FULL_MAPPED (1 << BH_FullMapped)
> +/* Located in the special packed inode */
> +#define EROFS_MAP_FRAGMENT (1 << BH_Fragment)
> +/* The extent refers to partial decompressed data */
> +#define EROFS_MAP_PARTIAL_REF (1 << BH_Partialref)
>
> struct erofs_map_blocks {
> - char mpage[EROFS_BLKSIZ];
> + char mpage[EROFS_MAX_BLOCK_SIZE];
>
> erofs_off_t m_pa, m_la;
> u64 m_plen, m_llen;
> @@ -257,9 +309,12 @@ struct erofs_map_blocks {
> * approach instead if possible since it's more metadata lightweight.)
> */
> #define EROFS_GET_BLOCKS_FIEMAP 0x0002
> +/* Used to map tail extent for tailpacking inline or fragment pcluster */
> +#define EROFS_GET_BLOCKS_FINDTAIL 0x0008
>
> enum {
> Z_EROFS_COMPRESSION_SHIFTED = Z_EROFS_COMPRESSION_MAX,
> + Z_EROFS_COMPRESSION_INTERLACED,
> Z_EROFS_COMPRESSION_RUNTIME_MAX
> };
>
> @@ -274,6 +329,7 @@ int erofs_dev_read(int device_id, void *buf, u64 offset, size_t len);
>
> /* super.c */
> int erofs_read_superblock(void);
> +void erofs_put_super(void);
>
> /* namei.c */
> int erofs_read_inode_from_disk(struct erofs_inode *vi);
> @@ -283,9 +339,40 @@ int erofs_read_inode_from_disk(struct erofs_inode *vi);
> /* data.c */
> int erofs_pread(struct erofs_inode *inode, char *buf,
> erofs_off_t count, erofs_off_t offset);
> -int erofs_map_blocks(struct erofs_inode *inode,
> - struct erofs_map_blocks *map, int flags);
> -int erofs_map_dev(struct erofs_sb_info *sbi, struct erofs_map_dev *map);
> +int erofs_map_blocks(struct erofs_inode *inode, struct erofs_map_blocks *map,
> + int flags);
> +int erofs_map_dev(struct erofs_map_dev *map);
> +int erofs_read_one_data(struct erofs_map_blocks *map, char *buffer, u64 offset,
> + size_t len);
> +int z_erofs_read_one_data(struct erofs_inode *inode,
> + struct erofs_map_blocks *map, char *raw, char *buffer,
> + erofs_off_t skip, erofs_off_t length, bool trimmed);
> +
> +static inline int erofs_get_occupied_size(const struct erofs_inode *inode,
> + erofs_off_t *size)
> +{
> + *size = 0;
> + switch (inode->datalayout) {
> + case EROFS_INODE_FLAT_INLINE:
> + case EROFS_INODE_FLAT_PLAIN:
> + case EROFS_INODE_CHUNK_BASED:
> + *size = inode->i_size;
> + break;
> + case EROFS_INODE_COMPRESSED_FULL:
> + case EROFS_INODE_COMPRESSED_COMPACT:
> + *size = inode->u.i_blocks * erofs_blksiz();
> + break;
> + default:
> + return -EOPNOTSUPP;
> + }
> + return 0;
> +}
> +
> +/* data.c */
> +int erofs_getxattr(struct erofs_inode *vi, const char *name, char *buffer,
> + size_t buffer_size);
> +int erofs_listxattr(struct erofs_inode *vi, char *buffer, size_t buffer_size);
> +
> /* zmap.c */
> int z_erofs_fill_inode(struct erofs_inode *vi);
> int z_erofs_map_blocks_iter(struct erofs_inode *vi,
> diff --git a/fs/erofs/namei.c b/fs/erofs/namei.c
> index d1d4757c50..bde995f1bf 100644
> --- a/fs/erofs/namei.c
> +++ b/fs/erofs/namei.c
> @@ -1,6 +1,15 @@
> // SPDX-License-Identifier: GPL-2.0+
> #include "internal.h"
>
> +#define makedev(major, minor) ((dev_t)((((major) & 0xfff) << 8) | ((minor) & 0xff)))
> +static dev_t erofs_new_decode_dev(u32 dev)
> +{
> + const unsigned int major = (dev & 0xfff00) >> 8;
> + const unsigned int minor = (dev & 0xff) | ((dev >> 12) & 0xfff00);
> +
> + return makedev(major, minor);
> +}
> +
> int erofs_read_inode_from_disk(struct erofs_inode *vi)
> {
> int ret, ifmt;
> @@ -26,7 +35,8 @@ int erofs_read_inode_from_disk(struct erofs_inode *vi)
> case EROFS_INODE_LAYOUT_EXTENDED:
> vi->inode_isize = sizeof(struct erofs_inode_extended);
>
> - ret = erofs_dev_read(0, buf + sizeof(*dic), inode_loc + sizeof(*dic),
> + ret = erofs_dev_read(0, buf + sizeof(*dic),
> + inode_loc + sizeof(*dic),
> sizeof(*die) - sizeof(*dic));
> if (ret < 0)
> return -EIO;
> @@ -43,7 +53,8 @@ int erofs_read_inode_from_disk(struct erofs_inode *vi)
> break;
> case S_IFCHR:
> case S_IFBLK:
> - vi->u.i_rdev = 0;
> + vi->u.i_rdev =
> + erofs_new_decode_dev(le32_to_cpu(die->i_u.rdev));
> break;
> case S_IFIFO:
> case S_IFSOCK:
> @@ -57,8 +68,8 @@ int erofs_read_inode_from_disk(struct erofs_inode *vi)
> vi->i_gid = le32_to_cpu(die->i_gid);
> vi->i_nlink = le32_to_cpu(die->i_nlink);
>
> - vi->i_ctime = le64_to_cpu(die->i_ctime);
> - vi->i_ctime_nsec = le64_to_cpu(die->i_ctime_nsec);
> + vi->i_mtime = le64_to_cpu(die->i_mtime);
> + vi->i_mtime_nsec = le64_to_cpu(die->i_mtime_nsec);
> vi->i_size = le64_to_cpu(die->i_size);
> if (vi->datalayout == EROFS_INODE_CHUNK_BASED)
> /* fill chunked inode summary info */
> @@ -77,7 +88,8 @@ int erofs_read_inode_from_disk(struct erofs_inode *vi)
> break;
> case S_IFCHR:
> case S_IFBLK:
> - vi->u.i_rdev = 0;
> + vi->u.i_rdev =
> + erofs_new_decode_dev(le32_to_cpu(dic->i_u.rdev));
> break;
> case S_IFIFO:
> case S_IFSOCK:
> @@ -91,8 +103,8 @@ int erofs_read_inode_from_disk(struct erofs_inode *vi)
> vi->i_gid = le16_to_cpu(dic->i_gid);
> vi->i_nlink = le16_to_cpu(dic->i_nlink);
>
> - vi->i_ctime = sbi.build_time;
> - vi->i_ctime_nsec = sbi.build_time_nsec;
> + vi->i_mtime = sbi.build_time;
> + vi->i_mtime_nsec = sbi.build_time_nsec;
>
> vi->i_size = le32_to_cpu(dic->i_size);
> if (vi->datalayout == EROFS_INODE_CHUNK_BASED)
> @@ -111,10 +123,13 @@ int erofs_read_inode_from_disk(struct erofs_inode *vi)
> vi->u.chunkformat, vi->nid | 0ULL);
> return -EOPNOTSUPP;
> }
> - vi->u.chunkbits = LOG_BLOCK_SIZE +
> + vi->u.chunkbits = sbi.blkszbits +
> (vi->u.chunkformat & EROFS_CHUNK_FORMAT_BLKBITS_MASK);
> - } else if (erofs_inode_is_data_compressed(vi->datalayout))
> - z_erofs_fill_inode(vi);
> + } else if (erofs_inode_is_data_compressed(vi->datalayout)) {
> + if (erofs_blksiz() != EROFS_MAX_BLOCK_SIZE)
> + return -EOPNOTSUPP;
> + return z_erofs_fill_inode(vi);
> + }
> return 0;
> bogusimode:
> erofs_err("bogus i_mode (%o) @ nid %llu", vi->i_mode, vi->nid | 0ULL);
> @@ -163,12 +178,11 @@ struct nameidata {
> unsigned int ftype;
> };
>
> -int erofs_namei(struct nameidata *nd,
> - const char *name, unsigned int len)
> +int erofs_namei(struct nameidata *nd, const char *name, unsigned int len)
> {
> erofs_nid_t nid = nd->nid;
> int ret;
> - char buf[EROFS_BLKSIZ];
> + char buf[EROFS_MAX_BLOCK_SIZE];
> struct erofs_inode vi = { .nid = nid };
> erofs_off_t offset;
>
> @@ -179,7 +193,7 @@ int erofs_namei(struct nameidata *nd,
> offset = 0;
> while (offset < vi.i_size) {
> erofs_off_t maxsize = min_t(erofs_off_t,
> - vi.i_size - offset, EROFS_BLKSIZ);
> + vi.i_size - offset, erofs_blksiz());
> struct erofs_dirent *de = (void *)buf;
> unsigned int nameoff;
>
> @@ -189,7 +203,7 @@ int erofs_namei(struct nameidata *nd,
>
> nameoff = le16_to_cpu(de->nameoff);
> if (nameoff < sizeof(struct erofs_dirent) ||
> - nameoff >= PAGE_SIZE) {
> + nameoff >= erofs_blksiz()) {
> erofs_err("invalid de[0].nameoff %u @ nid %llu",
> nameoff, nid | 0ULL);
> return -EFSCORRUPTED;
> diff --git a/fs/erofs/super.c b/fs/erofs/super.c
> index 8277d9b53f..d33926281b 100644
> --- a/fs/erofs/super.c
> +++ b/fs/erofs/super.c
> @@ -9,7 +9,7 @@ static bool check_layout_compatibility(struct erofs_sb_info *sbi,
> sbi->feature_incompat = feature;
>
> /* check if current kernel meets all mandatory requirements */
> - if (feature & (~EROFS_ALL_FEATURE_INCOMPAT)) {
> + if (feature & ~EROFS_ALL_FEATURE_INCOMPAT) {
> erofs_err("unidentified incompatible feature %x, please upgrade kernel version",
> feature & ~EROFS_ALL_FEATURE_INCOMPAT);
> return false;
> @@ -40,14 +40,18 @@ static int erofs_init_devices(struct erofs_sb_info *sbi,
>
> sbi->device_id_mask = roundup_pow_of_two(ondisk_extradevs + 1) - 1;
> sbi->devs = calloc(ondisk_extradevs, sizeof(*sbi->devs));
> + if (!sbi->devs)
> + return -ENOMEM;
> pos = le16_to_cpu(dsb->devt_slotoff) * EROFS_DEVT_SLOT_SIZE;
> for (i = 0; i < ondisk_extradevs; ++i) {
> struct erofs_deviceslot dis;
> int ret;
>
> ret = erofs_dev_read(0, &dis, pos, sizeof(dis));
> - if (ret < 0)
> + if (ret < 0) {
> + free(sbi->devs);
> return ret;
> + }
>
> sbi->devs[i].mapped_blkaddr = dis.mapped_blkaddr;
> sbi->total_blocks += dis.blocks;
> @@ -58,42 +62,41 @@ static int erofs_init_devices(struct erofs_sb_info *sbi,
>
> int erofs_read_superblock(void)
> {
> - char data[EROFS_BLKSIZ];
> + u8 data[EROFS_MAX_BLOCK_SIZE];
> struct erofs_super_block *dsb;
> - unsigned int blkszbits;
> int ret;
>
> - ret = erofs_blk_read(data, 0, 1);
> + ret = erofs_blk_read(data, 0, erofs_blknr(sizeof(data)));
> if (ret < 0) {
> - erofs_dbg("cannot read erofs superblock: %d", ret);
> + erofs_err("cannot read erofs superblock: %d", ret);
> return -EIO;
> }
> dsb = (struct erofs_super_block *)(data + EROFS_SUPER_OFFSET);
>
> ret = -EINVAL;
> if (le32_to_cpu(dsb->magic) != EROFS_SUPER_MAGIC_V1) {
> - erofs_dbg("cannot find valid erofs superblock");
> + erofs_err("cannot find valid erofs superblock");
> return ret;
> }
>
> sbi.feature_compat = le32_to_cpu(dsb->feature_compat);
>
> - blkszbits = dsb->blkszbits;
> - /* 9(512 bytes) + LOG_SECTORS_PER_BLOCK == LOG_BLOCK_SIZE */
> - if (blkszbits != LOG_BLOCK_SIZE) {
> - erofs_err("blksize %u isn't supported on this platform",
> - 1 << blkszbits);
> + sbi.blkszbits = dsb->blkszbits;
> + if (sbi.blkszbits < 9 ||
> + sbi.blkszbits > ilog2(EROFS_MAX_BLOCK_SIZE)) {
> + erofs_err("blksize %llu isn't supported on this platform",
> + erofs_blksiz() | 0ULL);
> return ret;
> - }
> -
> - if (!check_layout_compatibility(&sbi, dsb))
> + } else if (!check_layout_compatibility(&sbi, dsb)) {
> return ret;
> + }
>
> sbi.primarydevice_blocks = le32_to_cpu(dsb->blocks);
> sbi.meta_blkaddr = le32_to_cpu(dsb->meta_blkaddr);
> sbi.xattr_blkaddr = le32_to_cpu(dsb->xattr_blkaddr);
> sbi.islotbits = EROFS_ISLOTBITS;
> sbi.root_nid = le16_to_cpu(dsb->root_nid);
> + sbi.packed_nid = le64_to_cpu(dsb->packed_nid);
> sbi.inos = le64_to_cpu(dsb->inos);
> sbi.checksum = le32_to_cpu(dsb->checksum);
>
> diff --git a/fs/erofs/zmap.c b/fs/erofs/zmap.c
> index be2599ac4f..4f64258b00 100644
> --- a/fs/erofs/zmap.c
> +++ b/fs/erofs/zmap.c
> @@ -1,14 +1,19 @@
> // SPDX-License-Identifier: GPL-2.0+
> #include "internal.h"
>
> +static int z_erofs_do_map_blocks(struct erofs_inode *vi,
> + struct erofs_map_blocks *map,
> + int flags);
> +
> int z_erofs_fill_inode(struct erofs_inode *vi)
> {
> if (!erofs_sb_has_big_pcluster() &&
> - vi->datalayout == EROFS_INODE_FLAT_COMPRESSION_LEGACY) {
> + !erofs_sb_has_ztailpacking() && !erofs_sb_has_fragments() &&
> + vi->datalayout == EROFS_INODE_COMPRESSED_FULL) {
> vi->z_advise = 0;
> vi->z_algorithmtype[0] = 0;
> vi->z_algorithmtype[1] = 0;
> - vi->z_logical_clusterbits = LOG_BLOCK_SIZE;
> + vi->z_logical_clusterbits = sbi.blkszbits;
>
> vi->flags |= EROFS_I_Z_INITED;
> }
> @@ -25,15 +30,23 @@ static int z_erofs_fill_inode_lazy(struct erofs_inode *vi)
> if (vi->flags & EROFS_I_Z_INITED)
> return 0;
>
> - DBG_BUGON(!erofs_sb_has_big_pcluster() &&
> - vi->datalayout == EROFS_INODE_FLAT_COMPRESSION_LEGACY);
> pos = round_up(iloc(vi->nid) + vi->inode_isize + vi->xattr_isize, 8);
> -
> ret = erofs_dev_read(0, buf, pos, sizeof(buf));
> if (ret < 0)
> return -EIO;
>
> h = (struct z_erofs_map_header *)buf;
> + /*
> + * if the highest bit of the 8-byte map header is set, the whole file
> + * is stored in the packed inode. The rest bits keeps z_fragmentoff.
> + */
> + if (h->h_clusterbits >> Z_EROFS_FRAGMENT_INODE_BIT) {
> + vi->z_advise = Z_EROFS_ADVISE_FRAGMENT_PCLUSTER;
> + vi->fragmentoff = le64_to_cpu(*(__le64 *)h) ^ (1ULL << 63);
> + vi->z_tailextent_headlcn = 0;
> + goto out;
> + }
> +
> vi->z_advise = le16_to_cpu(h->h_advise);
> vi->z_algorithmtype[0] = h->h_algorithmtype & 15;
> vi->z_algorithmtype[1] = h->h_algorithmtype >> 4;
> @@ -44,14 +57,41 @@ static int z_erofs_fill_inode_lazy(struct erofs_inode *vi)
> return -EOPNOTSUPP;
> }
>
> - vi->z_logical_clusterbits = LOG_BLOCK_SIZE + (h->h_clusterbits & 7);
> - if (vi->datalayout == EROFS_INODE_FLAT_COMPRESSION &&
> + vi->z_logical_clusterbits = sbi.blkszbits + (h->h_clusterbits & 7);
> + if (vi->datalayout == EROFS_INODE_COMPRESSED_COMPACT &&
> !(vi->z_advise & Z_EROFS_ADVISE_BIG_PCLUSTER_1) ^
> !(vi->z_advise & Z_EROFS_ADVISE_BIG_PCLUSTER_2)) {
> erofs_err("big pcluster head1/2 of compact indexes should be consistent for nid %llu",
> vi->nid * 1ULL);
> return -EFSCORRUPTED;
> }
> +
> + if (vi->z_advise & Z_EROFS_ADVISE_INLINE_PCLUSTER) {
> + struct erofs_map_blocks map = { .index = UINT_MAX };
> +
> + vi->idata_size = le16_to_cpu(h->h_idata_size);
> + ret = z_erofs_do_map_blocks(vi, &map,
> + EROFS_GET_BLOCKS_FINDTAIL);
> + if (!map.m_plen ||
> + erofs_blkoff(map.m_pa) + map.m_plen > erofs_blksiz()) {
> + erofs_err("invalid tail-packing pclustersize %llu",
> + map.m_plen | 0ULL);
> + return -EFSCORRUPTED;
> + }
> + if (ret < 0)
> + return ret;
> + }
> + if (vi->z_advise & Z_EROFS_ADVISE_FRAGMENT_PCLUSTER &&
> + !(h->h_clusterbits >> Z_EROFS_FRAGMENT_INODE_BIT)) {
> + struct erofs_map_blocks map = { .index = UINT_MAX };
> +
> + vi->fragmentoff = le32_to_cpu(h->h_fragmentoff);
> + ret = z_erofs_do_map_blocks(vi, &map,
> + EROFS_GET_BLOCKS_FINDTAIL);
> + if (ret < 0)
> + return ret;
> + }
> +out:
> vi->flags |= EROFS_I_Z_INITED;
> return 0;
> }
> @@ -66,7 +106,9 @@ struct z_erofs_maprecorder {
> u8 type, headtype;
> u16 clusterofs;
> u16 delta[2];
> - erofs_blk_t pblk, compressedlcs;
> + erofs_blk_t pblk, compressedblks;
> + erofs_off_t nextpackoff;
> + bool partialref;
> };
>
> static int z_erofs_reload_indexes(struct z_erofs_maprecorder *m,
> @@ -93,11 +135,10 @@ static int legacy_load_cluster_from_disk(struct z_erofs_maprecorder *m,
> {
> struct erofs_inode *const vi = m->inode;
> const erofs_off_t ibase = iloc(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;
> + const erofs_off_t pos = Z_EROFS_FULL_INDEX_ALIGN(ibase +
> + vi->inode_isize + vi->xattr_isize) +
> + lcn * sizeof(struct z_erofs_lcluster_index);
> + struct z_erofs_lcluster_index *di;
> unsigned int advise, type;
> int err;
>
> @@ -105,29 +146,32 @@ static int legacy_load_cluster_from_disk(struct z_erofs_maprecorder *m,
> if (err)
> return err;
>
> + m->nextpackoff = pos + sizeof(struct z_erofs_lcluster_index);
> 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);
> + type = (advise >> Z_EROFS_LI_LCLUSTER_TYPE_BIT) &
> + ((1 << Z_EROFS_LI_LCLUSTER_TYPE_BITS) - 1);
> switch (type) {
> - case Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD:
> + case Z_EROFS_LCLUSTER_TYPE_NONHEAD:
> m->clusterofs = 1 << vi->z_logical_clusterbits;
> m->delta[0] = le16_to_cpu(di->di_u.delta[0]);
> - if (m->delta[0] & Z_EROFS_VLE_DI_D0_CBLKCNT) {
> + if (m->delta[0] & Z_EROFS_LI_D0_CBLKCNT) {
> if (!(vi->z_advise & Z_EROFS_ADVISE_BIG_PCLUSTER_1)) {
> DBG_BUGON(1);
> return -EFSCORRUPTED;
> }
> - m->compressedlcs = m->delta[0] &
> - ~Z_EROFS_VLE_DI_D0_CBLKCNT;
> + m->compressedblks = m->delta[0] &
> + ~Z_EROFS_LI_D0_CBLKCNT;
> m->delta[0] = 1;
> }
> 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:
> + case Z_EROFS_LCLUSTER_TYPE_PLAIN:
> + case Z_EROFS_LCLUSTER_TYPE_HEAD1:
> + if (advise & Z_EROFS_LI_PARTIAL_REF)
> + m->partialref = true;
> m->clusterofs = le16_to_cpu(di->di_clusterofs);
> m->pblk = le32_to_cpu(di->di_u.blkaddr);
> break;
> @@ -164,25 +208,25 @@ static int get_compacted_la_distance(unsigned int lclusterbits,
> lo = decode_compactedbits(lclusterbits, lomask,
> in, encodebits * i, &type);
>
> - if (type != Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD)
> + if (type != Z_EROFS_LCLUSTER_TYPE_NONHEAD)
> return d1;
> ++d1;
> } while (++i < vcnt);
>
> - /* vcnt - 1 (Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD) item */
> - if (!(lo & Z_EROFS_VLE_DI_D0_CBLKCNT))
> + /* vcnt - 1 (Z_EROFS_LCLUSTER_TYPE_NONHEAD) item */
> + if (!(lo & Z_EROFS_LI_D0_CBLKCNT))
> d1 += lo - 1;
> return d1;
> }
>
> static int unpack_compacted_index(struct z_erofs_maprecorder *m,
> unsigned int amortizedshift,
> - unsigned int eofs, bool lookahead)
> + erofs_off_t pos, bool lookahead)
> {
> struct erofs_inode *const vi = m->inode;
> const unsigned int lclusterbits = vi->z_logical_clusterbits;
> const unsigned int lomask = (1 << lclusterbits) - 1;
> - unsigned int vcnt, base, lo, encodebits, nblk;
> + unsigned int vcnt, base, lo, encodebits, nblk, eofs;
> int i;
> u8 *in, type;
> bool big_pcluster;
> @@ -194,8 +238,12 @@ static int unpack_compacted_index(struct z_erofs_maprecorder *m,
> else
> return -EOPNOTSUPP;
>
> + /* it doesn't equal to round_up(..) */
> + m->nextpackoff = round_down(pos, vcnt << amortizedshift) +
> + (vcnt << amortizedshift);
> big_pcluster = vi->z_advise & Z_EROFS_ADVISE_BIG_PCLUSTER_1;
> encodebits = ((vcnt << amortizedshift) - sizeof(__le32)) * 8 / vcnt;
> + eofs = erofs_blkoff(pos);
> base = round_down(eofs, vcnt << amortizedshift);
> in = m->kaddr + base;
>
> @@ -204,20 +252,19 @@ static int unpack_compacted_index(struct z_erofs_maprecorder *m,
> lo = decode_compactedbits(lclusterbits, lomask,
> in, encodebits * i, &type);
> m->type = type;
> - if (type == Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD) {
> + if (type == Z_EROFS_LCLUSTER_TYPE_NONHEAD) {
> m->clusterofs = 1 << lclusterbits;
>
> /* figure out lookahead_distance: delta[1] if needed */
> if (lookahead)
> m->delta[1] = get_compacted_la_distance(lclusterbits,
> - encodebits,
> - vcnt, in, i);
> - if (lo & Z_EROFS_VLE_DI_D0_CBLKCNT) {
> + encodebits, vcnt, in, i);
> + if (lo & Z_EROFS_LI_D0_CBLKCNT) {
> if (!big_pcluster) {
> DBG_BUGON(1);
> return -EFSCORRUPTED;
> }
> - m->compressedlcs = lo & ~Z_EROFS_VLE_DI_D0_CBLKCNT;
> + m->compressedblks = lo & ~Z_EROFS_LI_D0_CBLKCNT;
> m->delta[0] = 1;
> return 0;
> } else if (i + 1 != (int)vcnt) {
> @@ -231,9 +278,9 @@ static int unpack_compacted_index(struct z_erofs_maprecorder *m,
> */
> lo = decode_compactedbits(lclusterbits, lomask,
> in, encodebits * (i - 1), &type);
> - if (type != Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD)
> + if (type != Z_EROFS_LCLUSTER_TYPE_NONHEAD)
> lo = 0;
> - else if (lo & Z_EROFS_VLE_DI_D0_CBLKCNT)
> + else if (lo & Z_EROFS_LI_D0_CBLKCNT)
> lo = 1;
> m->delta[0] = lo + 1;
> return 0;
> @@ -247,7 +294,7 @@ static int unpack_compacted_index(struct z_erofs_maprecorder *m,
> --i;
> lo = decode_compactedbits(lclusterbits, lomask,
> in, encodebits * i, &type);
> - if (type == Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD)
> + if (type == Z_EROFS_LCLUSTER_TYPE_NONHEAD)
> i -= lo;
>
> if (i >= 0)
> @@ -259,13 +306,13 @@ static int unpack_compacted_index(struct z_erofs_maprecorder *m,
> --i;
> lo = decode_compactedbits(lclusterbits, lomask,
> in, encodebits * i, &type);
> - if (type == Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD) {
> - if (lo & Z_EROFS_VLE_DI_D0_CBLKCNT) {
> + if (type == Z_EROFS_LCLUSTER_TYPE_NONHEAD) {
> + if (lo & Z_EROFS_LI_D0_CBLKCNT) {
> --i;
> - nblk += lo & ~Z_EROFS_VLE_DI_D0_CBLKCNT;
> + nblk += lo & ~Z_EROFS_LI_D0_CBLKCNT;
> continue;
> }
> - if (lo == 1) {
> + if (lo <= 1) {
> DBG_BUGON(1);
> /* --i; ++nblk; continue; */
> return -EFSCORRUPTED;
> @@ -289,7 +336,7 @@ static int compacted_load_cluster_from_disk(struct z_erofs_maprecorder *m,
> const erofs_off_t ebase = round_up(iloc(vi->nid) + vi->inode_isize +
> vi->xattr_isize, 8) +
> sizeof(struct z_erofs_map_header);
> - const unsigned int totalidx = DIV_ROUND_UP(vi->i_size, EROFS_BLKSIZ);
> + const unsigned int totalidx = BLK_ROUND_UP(vi->i_size);
> unsigned int compacted_4b_initial, compacted_2b;
> unsigned int amortizedshift;
> erofs_off_t pos;
> @@ -307,7 +354,8 @@ static int compacted_load_cluster_from_disk(struct z_erofs_maprecorder *m,
> if (compacted_4b_initial == 32 / 4)
> compacted_4b_initial = 0;
>
> - if (vi->z_advise & Z_EROFS_ADVISE_COMPACTED_2B)
> + if ((vi->z_advise & Z_EROFS_ADVISE_COMPACTED_2B) &&
> + compacted_4b_initial < totalidx)
> compacted_2b = rounddown(totalidx - compacted_4b_initial, 16);
> else
> compacted_2b = 0;
> @@ -332,8 +380,7 @@ out:
> err = z_erofs_reload_indexes(m, erofs_blknr(pos));
> if (err)
> return err;
> - return unpack_compacted_index(m, amortizedshift, erofs_blkoff(pos),
> - lookahead);
> + return unpack_compacted_index(m, amortizedshift, pos, lookahead);
> }
>
> static int z_erofs_load_cluster_from_disk(struct z_erofs_maprecorder *m,
> @@ -341,10 +388,10 @@ static int z_erofs_load_cluster_from_disk(struct z_erofs_maprecorder *m,
> {
> const unsigned int datamode = m->inode->datalayout;
>
> - if (datamode == EROFS_INODE_FLAT_COMPRESSION_LEGACY)
> + if (datamode == EROFS_INODE_COMPRESSED_FULL)
> return legacy_load_cluster_from_disk(m, lcn);
>
> - if (datamode == EROFS_INODE_FLAT_COMPRESSION)
> + if (datamode == EROFS_INODE_COMPRESSED_COMPACT)
> return compacted_load_cluster_from_disk(m, lcn, lookahead);
>
> return -EINVAL;
> @@ -373,7 +420,7 @@ static int z_erofs_extent_lookback(struct z_erofs_maprecorder *m,
> return err;
>
> switch (m->type) {
> - case Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD:
> + case Z_EROFS_LCLUSTER_TYPE_NONHEAD:
> if (!m->delta[0]) {
> erofs_err("invalid lookback distance 0 @ nid %llu",
> (unsigned long long)vi->nid);
> @@ -381,8 +428,8 @@ static int z_erofs_extent_lookback(struct z_erofs_maprecorder *m,
> return -EFSCORRUPTED;
> }
> return z_erofs_extent_lookback(m, m->delta[0]);
> - case Z_EROFS_VLE_CLUSTER_TYPE_PLAIN:
> - case Z_EROFS_VLE_CLUSTER_TYPE_HEAD:
> + case Z_EROFS_LCLUSTER_TYPE_PLAIN:
> + case Z_EROFS_LCLUSTER_TYPE_HEAD1:
> m->headtype = m->type;
> map->m_la = (lcn << lclusterbits) | m->clusterofs;
> break;
> @@ -404,16 +451,17 @@ static int z_erofs_get_extent_compressedlen(struct z_erofs_maprecorder *m,
> unsigned long lcn;
> int err;
>
> - DBG_BUGON(m->type != Z_EROFS_VLE_CLUSTER_TYPE_PLAIN &&
> - m->type != Z_EROFS_VLE_CLUSTER_TYPE_HEAD);
> - if (m->headtype == Z_EROFS_VLE_CLUSTER_TYPE_PLAIN ||
> + DBG_BUGON(m->type != Z_EROFS_LCLUSTER_TYPE_PLAIN &&
> + m->type != Z_EROFS_LCLUSTER_TYPE_HEAD1);
> +
> + if (m->headtype == Z_EROFS_LCLUSTER_TYPE_PLAIN ||
> !(vi->z_advise & Z_EROFS_ADVISE_BIG_PCLUSTER_1)) {
> map->m_plen = 1 << lclusterbits;
> return 0;
> }
>
> lcn = m->lcn + 1;
> - if (m->compressedlcs)
> + if (m->compressedblks)
> goto out;
>
> err = z_erofs_load_cluster_from_disk(m, lcn, false);
> @@ -422,28 +470,28 @@ static int z_erofs_get_extent_compressedlen(struct z_erofs_maprecorder *m,
>
> /*
> * If the 1st NONHEAD lcluster has already been handled initially w/o
> - * valid compressedlcs, which means at least it mustn't be CBLKCNT, or
> + * valid compressedblks, which means at least it mustn't be CBLKCNT, or
> * an internal implemenatation error is detected.
> *
> * The following code can also handle it properly anyway, but let's
> * BUG_ON in the debugging mode only for developers to notice that.
> */
> DBG_BUGON(lcn == initial_lcn &&
> - m->type == Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD);
> + m->type == Z_EROFS_LCLUSTER_TYPE_NONHEAD);
>
> switch (m->type) {
> - case Z_EROFS_VLE_CLUSTER_TYPE_PLAIN:
> - case Z_EROFS_VLE_CLUSTER_TYPE_HEAD:
> + case Z_EROFS_LCLUSTER_TYPE_PLAIN:
> + case Z_EROFS_LCLUSTER_TYPE_HEAD1:
> /*
> * if the 1st NONHEAD lcluster is actually PLAIN or HEAD type
> * rather than CBLKCNT, it's a 1 lcluster-sized pcluster.
> */
> - m->compressedlcs = 1;
> + m->compressedblks = 1 << (lclusterbits - sbi.blkszbits);
> break;
> - case Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD:
> + case Z_EROFS_LCLUSTER_TYPE_NONHEAD:
> if (m->delta[0] != 1)
> goto err_bonus_cblkcnt;
> - if (m->compressedlcs)
> + if (m->compressedblks)
> break;
> /* fallthrough */
> default:
> @@ -453,7 +501,7 @@ static int z_erofs_get_extent_compressedlen(struct z_erofs_maprecorder *m,
> return -EFSCORRUPTED;
> }
> out:
> - map->m_plen = m->compressedlcs << lclusterbits;
> + map->m_plen = m->compressedblks << sbi.blkszbits;
> return 0;
> err_bonus_cblkcnt:
> erofs_err("bogus CBLKCNT @ lcn %lu of nid %llu",
> @@ -481,11 +529,11 @@ static int z_erofs_get_extent_decompressedlen(struct z_erofs_maprecorder *m)
> if (err)
> return err;
>
> - if (m->type == Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD) {
> + if (m->type == Z_EROFS_LCLUSTER_TYPE_NONHEAD) {
> DBG_BUGON(!m->delta[1] &&
> m->clusterofs != 1 << lclusterbits);
> - } else if (m->type == Z_EROFS_VLE_CLUSTER_TYPE_PLAIN ||
> - m->type == Z_EROFS_VLE_CLUSTER_TYPE_HEAD) {
> + } else if (m->type == Z_EROFS_LCLUSTER_TYPE_PLAIN ||
> + m->type == Z_EROFS_LCLUSTER_TYPE_HEAD1) {
> /* go on until the next HEAD lcluster */
> if (lcn != headlcn)
> break;
> @@ -504,10 +552,12 @@ static int z_erofs_get_extent_decompressedlen(struct z_erofs_maprecorder *m)
> return 0;
> }
>
> -int z_erofs_map_blocks_iter(struct erofs_inode *vi,
> - struct erofs_map_blocks *map,
> - int flags)
> +static int z_erofs_do_map_blocks(struct erofs_inode *vi,
> + struct erofs_map_blocks *map,
> + int flags)
> {
> + bool ztailpacking = vi->z_advise & Z_EROFS_ADVISE_INLINE_PCLUSTER;
> + bool fragment = vi->z_advise & Z_EROFS_ADVISE_FRAGMENT_PCLUSTER;
> struct z_erofs_maprecorder m = {
> .inode = vi,
> .map = map,
> @@ -518,20 +568,8 @@ int z_erofs_map_blocks_iter(struct erofs_inode *vi,
> unsigned long initial_lcn;
> unsigned long long ofs, end;
>
> - /* when trying to read beyond EOF, leave it unmapped */
> - if (map->m_la >= vi->i_size) {
> - map->m_llen = map->m_la + 1 - vi->i_size;
> - map->m_la = vi->i_size;
> - map->m_flags = 0;
> - goto out;
> - }
> -
> - err = z_erofs_fill_inode_lazy(vi);
> - if (err)
> - goto out;
> -
> lclusterbits = vi->z_logical_clusterbits;
> - ofs = map->m_la;
> + ofs = flags & EROFS_GET_BLOCKS_FINDTAIL ? vi->i_size - 1 : map->m_la;
> initial_lcn = ofs >> lclusterbits;
> endoff = ofs & ((1 << lclusterbits) - 1);
>
> @@ -539,11 +577,14 @@ int z_erofs_map_blocks_iter(struct erofs_inode *vi,
> if (err)
> goto out;
>
> + if (ztailpacking && (flags & EROFS_GET_BLOCKS_FINDTAIL))
> + vi->z_idataoff = m.nextpackoff;
> +
> map->m_flags = EROFS_MAP_MAPPED | EROFS_MAP_ENCODED;
> end = (m.lcn + 1ULL) << lclusterbits;
> switch (m.type) {
> - case Z_EROFS_VLE_CLUSTER_TYPE_PLAIN:
> - case Z_EROFS_VLE_CLUSTER_TYPE_HEAD:
> + case Z_EROFS_LCLUSTER_TYPE_PLAIN:
> + case Z_EROFS_LCLUSTER_TYPE_HEAD1:
> if (endoff >= m.clusterofs) {
> m.headtype = m.type;
> map->m_la = (m.lcn << lclusterbits) | m.clusterofs;
> @@ -560,7 +601,7 @@ int z_erofs_map_blocks_iter(struct erofs_inode *vi,
> map->m_flags |= EROFS_MAP_FULL_MAPPED;
> m.delta[0] = 1;
> /* fallthrough */
> - case Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD:
> + case Z_EROFS_LCLUSTER_TYPE_NONHEAD:
> /* get the correspoinding first chunk */
> err = z_erofs_extent_lookback(&m, m.delta[0]);
> if (err)
> @@ -572,18 +613,43 @@ int z_erofs_map_blocks_iter(struct erofs_inode *vi,
> err = -EOPNOTSUPP;
> goto out;
> }
> -
> + if (m.partialref)
> + map->m_flags |= EROFS_MAP_PARTIAL_REF;
> map->m_llen = end - map->m_la;
> - map->m_pa = blknr_to_addr(m.pblk);
> -
> - err = z_erofs_get_extent_compressedlen(&m, initial_lcn);
> - if (err)
> - goto out;
> + if (flags & EROFS_GET_BLOCKS_FINDTAIL) {
> + vi->z_tailextent_headlcn = m.lcn;
> + /* for non-compact indexes, fragmentoff is 64 bits */
> + if (fragment && vi->datalayout == EROFS_INODE_COMPRESSED_FULL)
> + vi->fragmentoff |= (u64)m.pblk << 32;
> + }
> + if (ztailpacking && m.lcn == vi->z_tailextent_headlcn) {
> + map->m_flags |= EROFS_MAP_META;
> + map->m_pa = vi->z_idataoff;
> + map->m_plen = vi->z_idata_size;
> + } else if (fragment && m.lcn == vi->z_tailextent_headlcn) {
> + map->m_flags |= EROFS_MAP_FRAGMENT;
> + } else {
> + map->m_pa = erofs_pos(m.pblk);
> + err = z_erofs_get_extent_compressedlen(&m, initial_lcn);
> + if (err)
> + goto out;
> + }
>
> - if (m.headtype == Z_EROFS_VLE_CLUSTER_TYPE_PLAIN)
> - map->m_algorithmformat = Z_EROFS_COMPRESSION_SHIFTED;
> - else
> + if (m.headtype == Z_EROFS_LCLUSTER_TYPE_PLAIN) {
> + if (map->m_llen > map->m_plen) {
> + DBG_BUGON(1);
> + err = -EFSCORRUPTED;
> + goto out;
> + }
> + if (vi->z_advise & Z_EROFS_ADVISE_INTERLACED_PCLUSTER)
> + map->m_algorithmformat =
> + Z_EROFS_COMPRESSION_INTERLACED;
> + else
> + map->m_algorithmformat =
> + Z_EROFS_COMPRESSION_SHIFTED;
> + } else {
> map->m_algorithmformat = vi->z_algorithmtype[0];
> + }
>
> if (flags & EROFS_GET_BLOCKS_FIEMAP) {
> err = z_erofs_get_extent_decompressedlen(&m);
> @@ -595,7 +661,38 @@ out:
> erofs_dbg("m_la %" PRIu64 " m_pa %" PRIu64 " m_llen %" PRIu64 " m_plen %" PRIu64 " m_flags 0%o",
> map->m_la, map->m_pa,
> map->m_llen, map->m_plen, map->m_flags);
> + return err;
> +}
>
> +int z_erofs_map_blocks_iter(struct erofs_inode *vi,
> + struct erofs_map_blocks *map,
> + int flags)
> +{
> + int err = 0;
> +
> + /* when trying to read beyond EOF, leave it unmapped */
> + if (map->m_la >= vi->i_size) {
> + map->m_llen = map->m_la + 1 - vi->i_size;
> + map->m_la = vi->i_size;
> + map->m_flags = 0;
> + goto out;
> + }
> +
> + err = z_erofs_fill_inode_lazy(vi);
> + if (err)
> + goto out;
> +
> + if ((vi->z_advise & Z_EROFS_ADVISE_FRAGMENT_PCLUSTER) &&
> + !vi->z_tailextent_headlcn) {
> + map->m_la = 0;
> + map->m_llen = vi->i_size;
> + map->m_flags = EROFS_MAP_MAPPED | EROFS_MAP_FULL_MAPPED |
> + EROFS_MAP_FRAGMENT;
> + goto out;
> + }
> +
> + err = z_erofs_do_map_blocks(vi, map, flags);
> +out:
> DBG_BUGON(err < 0 && err != -ENOMEM);
> return err;
> }
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