[PATCH] erofs-utils: introduce fuse framework
Gao Xiang
gaoxiang25 at huawei.com
Tue Aug 20 19:27:04 AEST 2019
Hi Guifu,
On Sun, Aug 18, 2019 at 06:59:23AM -0700, Li Guifu wrote:
> It builds a erofsfuse in the fuse directory.
> Using erofsfuse <images> <mount dir> to achive it.
>
> It only uspport read a regular file which is inline or not.
> Compressed file need another patch to finish it
>
> Signed-off-by: Li Guifu <blucerlee at gmail.com>
OK, let's play with it later, I will look through all
the code below and integrate it into erofs-utils framework.
Thanks,
Gao Xiang
> ---
> Makefile.am | 2 +-
> README | 28 ++++-
> configure.ac | 3 +-
> fuse/Makefile.am | 14 +++
> fuse/dentry.c | 129 ++++++++++++++++++++++
> fuse/dentry.h | 42 ++++++++
> fuse/disk_io.c | 72 +++++++++++++
> fuse/disk_io.h | 21 ++++
> fuse/getattr.c | 64 +++++++++++
> fuse/getattr.h | 15 +++
> fuse/init.c | 98 +++++++++++++++++
> fuse/init.h | 22 ++++
> fuse/logging.c | 81 ++++++++++++++
> fuse/logging.h | 55 ++++++++++
> fuse/main.c | 170 +++++++++++++++++++++++++++++
> fuse/namei.c | 225 +++++++++++++++++++++++++++++++++++++++
> fuse/namei.h | 22 ++++
> fuse/open.c | 22 ++++
> fuse/open.h | 15 +++
> fuse/read.c | 114 ++++++++++++++++++++
> fuse/read.h | 16 +++
> fuse/readir.c | 121 +++++++++++++++++++++
> fuse/readir.h | 17 +++
> include/erofs/defs.h | 3 +
> include/erofs/internal.h | 37 +++++++
> 25 files changed, 1405 insertions(+), 3 deletions(-)
> create mode 100644 fuse/Makefile.am
> create mode 100644 fuse/dentry.c
> create mode 100644 fuse/dentry.h
> create mode 100644 fuse/disk_io.c
> create mode 100644 fuse/disk_io.h
> create mode 100644 fuse/getattr.c
> create mode 100644 fuse/getattr.h
> create mode 100644 fuse/init.c
> create mode 100644 fuse/init.h
> create mode 100644 fuse/logging.c
> create mode 100644 fuse/logging.h
> create mode 100644 fuse/main.c
> create mode 100644 fuse/namei.c
> create mode 100644 fuse/namei.h
> create mode 100644 fuse/open.c
> create mode 100644 fuse/open.h
> create mode 100644 fuse/read.c
> create mode 100644 fuse/read.h
> create mode 100644 fuse/readir.c
> create mode 100644 fuse/readir.h
>
> diff --git a/Makefile.am b/Makefile.am
> index d94ab73..7e17994 100644
> --- a/Makefile.am
> +++ b/Makefile.am
> @@ -3,4 +3,4 @@
>
> ACLOCAL_AMFLAGS = -I m4
>
> -SUBDIRS=lib mkfs
> +SUBDIRS=lib mkfs fuse
> diff --git a/README b/README
> index 64c1e54..5765fff 100644
> --- a/README
> +++ b/README
> @@ -2,7 +2,8 @@ erofs-utils
> ===========
>
> erofs-utils includes user-space tools for erofs filesystem images.
> -Currently only mkfs.erofs is available.
> +One is mkfs.erofs to create a image, the other is erofsfuse which
> +is used to mount a image on a directory
>
> mkfs.erofs
> ----------
> @@ -80,6 +81,31 @@ It may still be useful since new erofs-utils has not been widely used in
> commercial products. However, if that happens, please report bug to us
> as well.
>
> +erofs-utils: erofsfuse
> +----------------------
> +erofsfuse mount a erofs filesystem image created by mkfs.erofs to a directory, and then
> +It can be listed, read files and so on.
> +
> +Dependencies
> +~~~~~~~~~~~~
> +FUSE library version: 2.9.7
> +fusermount version: 2.9.7
> +using FUSE kernel interface version 7.19
> +
> +How to installed fuse
> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> +sudo apt-get update
> +sudo apt-get install -y fuse libfuse-dev
> +
> +How to build erofsfuse
> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> +
> + $ ./autogen.sh
> + $ ./configure
> + $ make
> +
> +erofsfuse binary will be generated under fuse folder.
> +
> Contribution
> ------------
>
> diff --git a/configure.ac b/configure.ac
> index 6f4eacc..a8eb598 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -169,6 +169,7 @@ AM_CONDITIONAL([ENABLE_LZ4HC], [test "x${have_lz4hc}" = "xyes"])
>
> AC_CONFIG_FILES([Makefile
> lib/Makefile
> - mkfs/Makefile])
> + mkfs/Makefile
> + fuse/Makefile])
> AC_OUTPUT
>
> diff --git a/fuse/Makefile.am b/fuse/Makefile.am
> new file mode 100644
> index 0000000..fffd67a
> --- /dev/null
> +++ b/fuse/Makefile.am
> @@ -0,0 +1,14 @@
> +# SPDX-License-Identifier: GPL-2.0+
> +# Makefile.am
> +
> +AUTOMAKE_OPTIONS = foreign
> +bin_PROGRAMS = erofsfuse
> +erofsfuse_SOURCES = main.c dentry.c getattr.c logging.c namei.c read.c disk_io.c init.c open.c readir.c
> +erofsfuse_CFLAGS = -Wall -Werror -Wextra \
> + -I$(top_srcdir)/include \
> + $(shell pkg-config fuse --cflags) \
> + -DFUSE_USE_VERSION=26 \
> + -std=gnu99
> +LDFLAGS += $(shell pkg-config fuse --libs)
> +erofsfuse_LDADD = $(top_builddir)/lib/liberofs.la -ldl
> +
> diff --git a/fuse/dentry.c b/fuse/dentry.c
> new file mode 100644
> index 0000000..0569ff5
> --- /dev/null
> +++ b/fuse/dentry.c
> @@ -0,0 +1,129 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * erofs-fuse\dentry.c
> + * Created by Li Guifu <blucerlee at gmail.com>
> + */
> +
> +#include "dentry.h"
> +#include "erofs/internal.h"
> +#include "logging.h"
> +
> +#define DCACHE_ENTRY_CALLOC() calloc(1, sizeof(struct dcache_entry))
> +#define DCACHE_ENTRY_LIFE 8
> +
> +struct dcache_entry root_entry;
> +
> +int dcache_init_root(uint32_t nid)
> +{
> + if (root_entry.nid)
> + return -1;
> +
> + /* Root entry doesn't need most of the fields. Namely, it only uses the
> + * nid field and the subdirs pointer.
> + */
> + logi("Initializing root_entry dcache entry");
> + root_entry.nid = nid;
> + root_entry.subdirs = NULL;
> + root_entry.siblings = NULL;
> +
> + return 0;
> +}
> +
> +/* Inserts a node as a subdirs of a given parent. The parent is updated to
> + * point the newly inserted subdirs as the first subdirs. We return the new
> + * entry so that further entries can be inserted.
> + *
> + * [0] [0]
> + * / ==> \
> + * / ==> \
> + * .->[1]->[2]-. .->[1]->[3]->[2]-.
> + * `-----------´ `----------------´
> + */
> +struct dcache_entry *dcache_insert(struct dcache_entry *parent,
> + const char *name, int namelen, uint32_t nid)
> +{
> + struct dcache_entry *new_entry;
> +
> + logd("Inserting %s,%d to dcache", name, namelen);
> +
> + /* TODO: Deal with names that exceed the allocated size */
> + if (namelen + 1 > DCACHE_ENTRY_NAME_LEN)
> + return NULL;
> +
> + if (parent == NULL)
> + parent = &root_entry;
> +
> + new_entry = DCACHE_ENTRY_CALLOC();
> + if (!new_entry)
> + return NULL;
> +
> + strncpy(new_entry->name, name, namelen);
> + new_entry->name[namelen] = 0;
> + new_entry->nid = nid;
> +
> + if (!parent->subdirs) {
> + new_entry->siblings = new_entry;
> + parent->subdirs = new_entry;
> + } else {
> + new_entry->siblings = parent->subdirs->siblings;
> + parent->subdirs->siblings = new_entry;
> + parent->subdirs = new_entry;
> + }
> +
> + return new_entry;
> +}
> +
> +/* Lookup a cache entry for a given file name. Return value is a struct pointer
> + * that can be used to both obtain the nid number and insert further child
> + * entries.
> + * TODO: Prune entries by using the LRU counter
> + */
> +struct dcache_entry *dcache_lookup(struct dcache_entry *parent,
> + const char *name, int namelen)
> +{
> + struct dcache_entry *iter;
> +
> + if (parent == NULL)
> + parent = &root_entry;
> +
> + if (!parent->subdirs)
> + return NULL;
> +
> + /* Iterate the list of siblings to see if there is any match */
> + iter = parent->subdirs;
> +
> + do {
> + if (strncmp(iter->name, name, namelen) == 0 &&
> + iter->name[namelen] == 0) {
> + parent->subdirs = iter;
> +
> + return iter;
> + }
> +
> + iter = iter->siblings;
> + } while (iter != parent->subdirs);
> +
> + return NULL;
> +}
> +
> +struct dcache_entry *dcache_try_insert(struct dcache_entry *parent,
> + const char *name, int namelen, uint32_t nid)
> +{
> + struct dcache_entry *d = dcache_lookup(parent, name, namelen);
> +
> + if (d)
> + return d;
> +
> + return dcache_insert(parent, name, namelen, nid);
> +
> +}
> +erofs_nid_t dcache_get_nid(struct dcache_entry *entry)
> +{
> + return entry ? entry->nid : root_entry.nid;
> +}
> +
> +struct dcache_entry *dcache_root(void)
> +{
> + return &root_entry;
> +}
> +
> diff --git a/fuse/dentry.h b/fuse/dentry.h
> new file mode 100644
> index 0000000..ee2144d
> --- /dev/null
> +++ b/fuse/dentry.h
> @@ -0,0 +1,42 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * erofs-fuse\dentry.h
> + * Created by Li Guifu <blucerlee at gmail.com>
> + */
> +
> +#ifndef _EROFS_DENTRY_H
> +#define _EROFS_DENTRY_H
> +
> +#include <stdint.h>
> +#include "erofs/internal.h"
> +
> +#ifdef __64BITS
> +#define DCACHE_ENTRY_NAME_LEN 40
> +#else
> +#define DCACHE_ENTRY_NAME_LEN 48
> +#endif
> +
> +/* This struct declares a node of a k-tree. Every node has a pointer to one of
> + * the subdirs and a pointer (in a circular list fashion) to its siblings.
> + */
> +
> +struct dcache_entry {
> + struct dcache_entry *subdirs;
> + struct dcache_entry *siblings;
> + uint32_t nid;
> + uint16_t lru_count;
> + uint8_t user_count;
> + char name[DCACHE_ENTRY_NAME_LEN];
> +};
> +
> +struct dcache_entry *dcache_insert(struct dcache_entry *parent,
> + const char *name, int namelen, uint32_t n);
> +struct dcache_entry *dcache_lookup(struct dcache_entry *parent,
> + const char *name, int namelen);
> +struct dcache_entry *dcache_try_insert(struct dcache_entry *parent,
> + const char *name, int namelen,
> + uint32_t nid);
> +
> +erofs_nid_t dcache_get_nid(struct dcache_entry *entry);
> +int dcache_init_root(uint32_t n);
> +#endif
> diff --git a/fuse/disk_io.c b/fuse/disk_io.c
> new file mode 100644
> index 0000000..72d351b
> --- /dev/null
> +++ b/fuse/disk_io.c
> @@ -0,0 +1,72 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * erofs-fuse\disk_io.c
> + * Created by Li Guifu <blucerlee at gmail.com>
> + */
> +
> +#define _XOPEN_SOURCE 500
> +#include "disk_io.h"
> +
> +#include <sys/types.h>
> +#include <unistd.h>
> +#include <fcntl.h>
> +#include <errno.h>
> +#include <pthread.h>
> +#include <errno.h>
> +
> +#include "logging.h"
> +
> +#ifdef __FreeBSD__
> +#include <string.h>
> +#endif
> +
> +static const char *erofs_devname;
> +static int erofs_devfd = -1;
> +static pthread_mutex_t read_lock = PTHREAD_MUTEX_INITIALIZER;
> +
> +int dev_open(const char *path)
> +{
> + int fd = open(path, O_RDONLY);
> +
> + if (fd < 0)
> + return -errno;
> +
> + erofs_devfd = fd;
> + erofs_devname = path;
> +
> + return 0;
> +}
> +
> +static inline int pread_wrapper(int fd, void *buf, size_t count, off_t offset)
> +{
> + return pread(fd, buf, count, offset);
> +}
> +
> +int dev_read(void *buf, size_t count, off_t offset)
> +{
> + ssize_t pread_ret;
> + int lerrno;
> +
> + ASSERT(erofs_devfd >= 0);
> +
> + pthread_mutex_lock(&read_lock);
> + pread_ret = pread_wrapper(erofs_devfd, buf, count, offset);
> + lerrno = errno;
> + logd("Disk Read: offset[0x%jx] count[%zd] pread_ret=%zd %s",
> + offset, count, pread_ret, strerror(lerrno));
> + pthread_mutex_unlock(&read_lock);
> + if (count == 0)
> + logw("Read operation with 0 size");
> +
> + ASSERT((size_t)pread_ret == count);
> +
> + return pread_ret;
> +}
> +
> +void dev_close(void)
> +{
> + if (erofs_devfd >= 0) {
> + close(erofs_devfd);
> + erofs_devfd = -1;
> + }
> +}
> diff --git a/fuse/disk_io.h b/fuse/disk_io.h
> new file mode 100644
> index 0000000..6b4bd3c
> --- /dev/null
> +++ b/fuse/disk_io.h
> @@ -0,0 +1,21 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * erofs-fuse\disk_io.h
> + * Created by Li Guifu <blucerlee at gmail.com>
> + */
> +
> +#ifndef __DISK_IO_H
> +#define __DISK_IO_H
> +
> +#include "erofs/defs.h"
> +#include "erofs/internal.h"
> +
> +int dev_open(const char *path);
> +void dev_close(void);
> +int dev_read(void *buf, size_t count, off_t offset);
> +
> +static inline int dev_read_blk(void *buf, uint32_t nr)
> +{
> + return dev_read(buf, EROFS_BLKSIZ, blknr_to_addr(nr));
> +}
> +#endif
> diff --git a/fuse/getattr.c b/fuse/getattr.c
> new file mode 100644
> index 0000000..6c91424
> --- /dev/null
> +++ b/fuse/getattr.c
> @@ -0,0 +1,64 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * erofs-fuse\getattr.c
> + * Created by Li Guifu <blucerlee at gmail.com>
> + */
> +
> +#include "getattr.h"
> +
> +#include <sys/types.h>
> +#include <sys/stat.h>
> +#include <unistd.h>
> +#include <errno.h>
> +
> +#include "erofs/defs.h"
> +#include "erofs/internal.h"
> +#include "erofs_fs.h"
> +
> +#include "logging.h"
> +#include "namei.h"
> +
> +extern struct erofs_super_block super;
> +
> +/* GNU's definitions of the attributes
> + * (http://www.gnu.org/software/libc/manual/html_node/Attribute-Meanings.html):
> + * st_uid: The user ID of the file’s owner.
> + * st_gid: The group ID of the file.
> + * st_atime: This is the last access time for the file.
> + * st_mtime: This is the time of the last modification to the contents of the
> + * file.
> + * st_mode: Specifies the mode of the file. This includes file type information
> + * (see Testing File Type) and the file permission bits (see Permission
> + * Bits).
> + * st_nlink: The number of hard links to the file.This count keeps track of how
> + * many directories have entries for this file. If the count is ever
> + * decremented to zero, then the file itself is discarded as soon as
> + * no process still holds it open. Symbolic links are not counted in
> + * the total.
> + * st_size: This specifies the size of a regular file in bytes. For files that
> + * are really devices this field isn’t usually meaningful.For symbolic
> + * links this specifies the length of the file name the link refers to.
> + */
> +int erofs_getattr(const char *path, struct stat *stbuf)
> +{
> + struct erofs_vnode v;
> + int ret;
> +
> + logd("getattr(%s)", path);
> + memset(&v, 0, sizeof(v));
> + ret = erofs_iget_by_path(path, &v);
> + if (ret)
> + return -ENOENT;
> +
> + stbuf->st_mode = le16_to_cpu(v.i_mode);
> + stbuf->st_nlink = le16_to_cpu(v.i_nlink);
> + stbuf->st_size = le32_to_cpu(v.i_size);
> + stbuf->st_blocks = stbuf->st_size / EROFS_BLKSIZ;
> + stbuf->st_uid = le16_to_cpu(v.i_uid);
> + stbuf->st_gid = le16_to_cpu(v.i_gid);
> + stbuf->st_atime = super.build_time;
> + stbuf->st_mtime = super.build_time;
> + stbuf->st_ctime = super.build_time;
> +
> + return 0;
> +}
> diff --git a/fuse/getattr.h b/fuse/getattr.h
> new file mode 100644
> index 0000000..dbcff7c
> --- /dev/null
> +++ b/fuse/getattr.h
> @@ -0,0 +1,15 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * erofs-fuse\getattr.h
> + * Created by Li Guifu <blucerlee at gmail.com>
> + */
> +
> +#ifndef __EROFS_GETATTR_H
> +#define __EROFS_GETATTR_H
> +
> +#include <fuse.h>
> +#include <fuse_opt.h>
> +
> +int erofs_getattr(const char *path, struct stat *st);
> +
> +#endif
> diff --git a/fuse/init.c b/fuse/init.c
> new file mode 100644
> index 0000000..885705f
> --- /dev/null
> +++ b/fuse/init.c
> @@ -0,0 +1,98 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * erofs-fuse\init.c
> + * Created by Li Guifu <blucerlee at gmail.com>
> + */
> +
> +#include "init.h"
> +#include <string.h>
> +#include <asm-generic/errno-base.h>
> +
> +#include "namei.h"
> +#include "disk_io.h"
> +#include "logging.h"
> +
> +#define STR(_X) (#_X)
> +#define SUPER_MEM(_X) (super._X)
> +
> +
> +struct erofs_super_block super;
> +static struct erofs_super_block *sbk = &super;
> +
> +int erofs_init_super(void)
> +{
> + int ret;
> + char buf[EROFS_BLKSIZ];
> + struct erofs_super_block *sb;
> +
> + memset(buf, 0, sizeof(buf));
> + ret = dev_read_blk(buf, 0);
> + if (ret != EROFS_BLKSIZ) {
> + logi("Failed to read super block ret=%d", ret);
> + return -EINVAL;
> + }
> +
> + sb = (struct erofs_super_block *) (buf + BOOT_SECTOR_SIZE);
> + sbk->magic = le32_to_cpu(sb->magic);
> + if (sbk->magic != EROFS_SUPER_MAGIC_V1) {
> + logi("EROFS magic[0x%X] NOT matched to [0x%X] ",
> + super.magic, EROFS_SUPER_MAGIC_V1);
> + return -EINVAL;
> + }
> +
> + sbk->checksum = le32_to_cpu(sb->checksum);
> + sbk->features = le32_to_cpu(sb->features);
> + sbk->blkszbits = sb->blkszbits;
> + ASSERT(sbk->blkszbits != 32);
> +
> + sbk->inos = le64_to_cpu(sb->inos);
> + sbk->build_time = le64_to_cpu(sb->build_time);
> + sbk->build_time_nsec = le32_to_cpu(sb->build_time_nsec);
> + sbk->blocks = le32_to_cpu(sb->blocks);
> + sbk->meta_blkaddr = le32_to_cpu(sb->meta_blkaddr);
> + sbk->xattr_blkaddr = le32_to_cpu(sb->xattr_blkaddr);
> + memcpy(sbk->uuid, sb->uuid, 16);
> + memcpy(sbk->volume_name, sb->volume_name, 16);
> + sbk->root_nid = le16_to_cpu(sb->root_nid);
> +
> + logp("%-15s:0x%X", STR(magic), SUPER_MEM(magic));
> + logp("%-15s:0x%X", STR(features), SUPER_MEM(features));
> + logp("%-15s:%u", STR(blkszbits), SUPER_MEM(blkszbits));
> + logp("%-15s:%u", STR(root_nid), SUPER_MEM(root_nid));
> + logp("%-15s:%ul", STR(inos), SUPER_MEM(inos));
> + logp("%-15s:%d", STR(meta_blkaddr), SUPER_MEM(meta_blkaddr));
> + logp("%-15s:%d", STR(xattr_blkaddr), SUPER_MEM(xattr_blkaddr));
> +
> + return 0;
> +}
> +
> +erofs_nid_t erofs_get_root_nid(void)
> +{
> + return sbk->root_nid;
> +}
> +
> +erofs_nid_t addr2nid(erofs_off_t addr)
> +{
> + erofs_nid_t offset = (erofs_nid_t)sbk->meta_blkaddr * EROFS_BLKSIZ;
> +
> + ASSERT(IS_SLOT_ALIGN(addr));
> + return (addr - offset) >> EROFS_ISLOTBITS;
> +}
> +
> +erofs_off_t nid2addr(erofs_nid_t nid)
> +{
> + erofs_off_t offset = (erofs_off_t)sbk->meta_blkaddr * EROFS_BLKSIZ;
> +
> + return (nid << EROFS_ISLOTBITS) + offset;
> +}
> +
> +void *erofs_init(struct fuse_conn_info *info)
> +{
> + logi("Using FUSE protocol %d.%d", info->proto_major, info->proto_minor);
> +
> + if (inode_init(erofs_get_root_nid()) != 0) {
> + loge("inode initialization failed")
> + ABORT();
> + }
> + return NULL;
> +}
> diff --git a/fuse/init.h b/fuse/init.h
> new file mode 100644
> index 0000000..d7a97b5
> --- /dev/null
> +++ b/fuse/init.h
> @@ -0,0 +1,22 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * erofs-fuse\init.h
> + * Created by Li Guifu <blucerlee at gmail.com>
> + */
> +
> +#ifndef __EROFS_INIT_H
> +#define __EROFS_INIT_H
> +
> +#include <fuse.h>
> +#include <fuse_opt.h>
> +#include "erofs/internal.h"
> +
> +#define BOOT_SECTOR_SIZE 0x400
> +
> +int erofs_init_super(void);
> +erofs_nid_t erofs_get_root_nid(void);
> +erofs_off_t nid2addr(erofs_nid_t nid);
> +erofs_nid_t addr2nid(erofs_off_t addr);
> +void *erofs_init(struct fuse_conn_info *info);
> +
> +#endif
> diff --git a/fuse/logging.c b/fuse/logging.c
> new file mode 100644
> index 0000000..2d1f1c7
> --- /dev/null
> +++ b/fuse/logging.c
> @@ -0,0 +1,81 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * erofs-fuse\logging.c
> + * Created by Li Guifu <blucerlee at gmail.com>
> + */
> +
> +#include "logging.h"
> +
> +#include <stdio.h>
> +#include <stdarg.h>
> +#include <pthread.h>
> +
> +static int loglevel = DEFAULT_LOG_LEVEL;
> +static FILE *logfile;
> +static const char * const loglevel_str[] = {
> + [LOG_EMERG] = "[emerg]",
> + [LOG_ALERT] = "[alert]",
> + [LOG_DUMP] = "[dump] ",
> + [LOG_ERR] = "[err] ",
> + [LOG_WARNING] = "[warn] ",
> + [LOG_NOTICE] = "[notic]",
> + [LOG_INFO] = "[info] ",
> + [LOG_DEBUG] = "[debug]",
> +};
> +
> +void __LOG(int level, const char *func, int line, const char *format, ...)
> +{
> + static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
> + va_list ap;
> + FILE *fp = logfile ? logfile : stdout;
> +
> + if (!fp)
> + return;
> + if (level < 0 || level > loglevel)
> + return;
> +
> + /* We have a lock here so different threads don interleave the log
> + * output
> + */
> + pthread_mutex_lock(&lock);
> + va_start(ap, format);
> + fprintf(fp, "%s", loglevel_str[level]);
> + if (func)
> + fprintf(fp, "%s", func);
> + if (line >= 0)
> + fprintf(fp, "(%d):", line);
> + vfprintf(fp, format, ap);
> + fprintf(fp, "\n");
> + va_end(ap);
> + fflush(fp);
> + pthread_mutex_unlock(&lock);
> +}
> +
> +inline void logging_setlevel(int new_level)
> +{
> + loglevel = new_level;
> +}
> +
> +int logging_open(const char *path)
> +{
> + if (path == NULL)
> + return 0;
> +
> + logfile = fopen(path, "w");
> + if (logfile == NULL) {
> + perror("open");
> + return -1;
> + }
> +
> + return 0;
> +}
> +
> +void logging_close(void)
> +{
> + if (logfile) {
> + fflush(logfile);
> + fclose(logfile);
> + logfile = NULL;
> + }
> +}
> +
> diff --git a/fuse/logging.h b/fuse/logging.h
> new file mode 100644
> index 0000000..7aa2eda
> --- /dev/null
> +++ b/fuse/logging.h
> @@ -0,0 +1,55 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * erofs-fuse\logging.h
> + * Created by Li Guifu <blucerlee at gmail.com>
> + */
> +
> +#ifndef __LOGGING_H
> +#define __LOGGING_H
> +
> +#include <assert.h>
> +#include <stdlib.h>
> +
> +#define LOG_EMERG 0
> +#define LOG_ALERT 1
> +#define LOG_DUMP 2
> +#define LOG_ERR 3
> +#define LOG_WARNING 4
> +#define LOG_NOTICE 5
> +#define LOG_INFO 6
> +#define LOG_DEBUG 7
> +
> +#define logem(...) __LOG(LOG_EMERG, __func__, __LINE__, ##__VA_ARGS__)
> +#define loga(...) __LOG(LOG_ALERT, __func__, __LINE__, ##__VA_ARGS__)
> +#define loge(...) __LOG(LOG_ERR, __func__, __LINE__, ##__VA_ARGS__)
> +#define logw(...) __LOG(LOG_WARNING, __func__, __LINE__, ##__VA_ARGS__)
> +#define logn(...) __LOG(LOG_NOTICE, __func__, __LINE__, ##__VA_ARGS__)
> +#define logi(...) __LOG(LOG_INFO, __func__, __LINE__, ##__VA_ARGS__)
> +#define logp(...) __LOG(LOG_DUMP, "", -1, ##__VA_ARGS__)
> +#define logd(...) __LOG(LOG_DEBUG, __func__, __LINE__, ##__VA_ARGS__)
> +
> +#define DEFAULT_LOG_FILE "fuse.log"
> +
> +#ifdef _DEBUG
> +#define DEFAULT_LOG_LEVEL LOG_DEBUG
> +
> +#define ASSERT(assertion) ({ \
> + if (!(assertion)) { \
> + logw("ASSERT FAIL: " #assertion); \
> + assert(assertion); \
> + } \
> +})
> +#define ABORT(_X) abort(_X)
> +#else
> +#define DEFAULT_LOG_LEVEL LOG_ERR
> +#define ASSERT(assertion)
> +#define ABORT(_X)
> +#endif
> +
> +void __LOG(int level, const char *func, int line, const char *format, ...);
> +void logging_setlevel(int new_level);
> +int logging_open(const char *path);
> +void logging_close(void);
> +
> +#endif
> +
> diff --git a/fuse/main.c b/fuse/main.c
> new file mode 100644
> index 0000000..fa9795e
> --- /dev/null
> +++ b/fuse/main.c
> @@ -0,0 +1,170 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * erofs-fuse\main.c
> + * Created by Li Guifu <blucerlee at gmail.com>
> + */
> +
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <string.h>
> +#include <execinfo.h>
> +#include <signal.h>
> +#include <stddef.h>
> +
> +#include "logging.h"
> +#include "init.h"
> +#include "read.h"
> +#include "getattr.h"
> +#include "open.h"
> +#include "readir.h"
> +#include "disk_io.h"
> +
> +enum {
> + EROFS_OPT_HELP,
> + EROFS_OPT_VER,
> +};
> +
> +struct options {
> + const char *disk;
> + const char *mount;
> + const char *logfile;
> + unsigned int debug_lvl;
> +};
> +static struct options cfg;
> +
> +#define OPTION(t, p) { t, offsetof(struct options, p), 1 }
> +
> +static const struct fuse_opt option_spec[] = {
> + OPTION("--log=%s", logfile),
> + OPTION("--dbg=%u", debug_lvl),
> + FUSE_OPT_KEY("-h", EROFS_OPT_HELP),
> + FUSE_OPT_KEY("-v", EROFS_OPT_VER),
> + FUSE_OPT_END
> +};
> +
> +static void usage(void)
> +{
> + fprintf(stderr, "\terofsfuse [options] <image> <mountpoint>\n");
> + fprintf(stderr, "\t --log=<file> output log file\n");
> + fprintf(stderr, "\t --dbg=<level> log debug level 0 ~ 7\n");
> + fprintf(stderr, "\t -h show help\n");
> + fprintf(stderr, "\t -v show version\n");
> + exit(1);
> +}
> +
> +static void dump_cfg(void)
> +{
> + fprintf(stderr, "\tdisk :%s\n", cfg.disk);
> + fprintf(stderr, "\tmount:%s\n", cfg.mount);
> + fprintf(stderr, "\tdebug_lvl:%u\n", cfg.debug_lvl);
> + fprintf(stderr, "\tlogfile :%s\n", cfg.logfile);
> +}
> +
> +static int optional_opt_func(void *data, const char *arg, int key,
> + struct fuse_args *outargs)
> +{
> + UNUSED(data);
> + UNUSED(outargs);
> +
> + switch (key) {
> + case FUSE_OPT_KEY_OPT:
> + return 1;
> +
> + case FUSE_OPT_KEY_NONOPT:
> + if (!cfg.disk) {
> + cfg.disk = strdup(arg);
> + return 0;
> + } else if (!cfg.mount)
> + cfg.mount = strdup(arg);
> +
> + return 1;
> + case EROFS_OPT_HELP:
> + usage();
> + break;
> +
> + case EROFS_OPT_VER:
> + fprintf(stderr, "EROFS FUSE VERSION v 1.0.0\n");
> + exit(0);
> + }
> +
> + return 1;
> +}
> +
> +static void signal_handle_sigsegv(int signal)
> +{
> + void *array[10];
> + size_t nptrs;
> + char **strings;
> + size_t i;
> +
> + UNUSED(signal);
> + logd("========================================");
> + logd("Segmentation Fault. Starting backtrace:");
> + nptrs = backtrace(array, 10);
> + strings = backtrace_symbols(array, nptrs);
> + if (strings) {
> + for (i = 0; i < nptrs; i++)
> + logd("%s", strings[i]);
> + free(strings);
> + }
> + logd("========================================");
> +
> + abort();
> +}
> +
> +static struct fuse_operations erofs_ops = {
> + .getattr = erofs_getattr,
> + .readdir = erofs_readdir,
> + .open = erofs_open,
> + .read = erofs_read,
> + .init = erofs_init,
> +};
> +
> +int main(int argc, char *argv[])
> +{
> + int ret = EXIT_FAILURE;
> + struct fuse_args args = FUSE_ARGS_INIT(argc, argv);
> +
> + if (signal(SIGSEGV, signal_handle_sigsegv) == SIG_ERR) {
> + fprintf(stderr, "Failed to initialize signals\n");
> + return EXIT_FAILURE;
> + }
> +
> + /* Parse options */
> + if (fuse_opt_parse(&args, &cfg, option_spec, optional_opt_func) < 0)
> + return 1;
> +
> + dump_cfg();
> +
> + if (logging_open(cfg.logfile) < 0) {
> + fprintf(stderr, "Failed to initialize logging\n");
> + goto exit;
> + }
> +
> + logging_setlevel(cfg.debug_lvl);
> +
> + if (dev_open(cfg.disk) < 0) {
> + fprintf(stderr, "Failed to open disk:%s\n", cfg.disk);
> + goto exit_log;
> + }
> +
> + if (erofs_init_super()) {
> + fprintf(stderr, "Failed to read erofs super block\n");
> + goto exit_dev;
> + }
> +
> + logi("fuse start");
> +
> + ret = fuse_main(args.argc, args.argv, &erofs_ops, NULL);
> +
> + logi("fuse done ret=%d", ret);
> +
> +exit_dev:
> + dev_close();
> +exit_log:
> + logging_close();
> +exit:
> + fuse_opt_free_args(&args);
> + return ret;
> +}
> +
> diff --git a/fuse/namei.c b/fuse/namei.c
> new file mode 100644
> index 0000000..ab497e8
> --- /dev/null
> +++ b/fuse/namei.c
> @@ -0,0 +1,225 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * erofs-fuse\inode.c
> + * Created by Li Guifu <blucerlee at gmail.com>
> + */
> +
> +#include "namei.h"
> +#include <linux/kdev_t.h>
> +#include <sys/types.h>
> +#include <unistd.h>
> +#include <stdio.h>
> +#include <errno.h>
> +#include <sys/stat.h>
> +
> +#include "erofs/defs.h"
> +#include "logging.h"
> +#include "disk_io.h"
> +#include "dentry.h"
> +#include "init.h"
> +
> +#define IS_PATH_SEPARATOR(__c) ((__c) == '/')
> +#define MINORBITS 20
> +#define MINORMASK ((1U << MINORBITS) - 1)
> +#define DT_UNKNOWN 0
> +
> +static const char *skip_trailing_backslash(const char *path)
> +{
> + while (IS_PATH_SEPARATOR(*path))
> + path++;
> + return path;
> +}
> +
> +static uint8_t get_path_token_len(const char *path)
> +{
> + uint8_t len = 0;
> +
> + while (path[len] != '/' && path[len])
> + len++;
> + return len;
> +}
> +
> +int erofs_iget_by_nid(erofs_nid_t nid, struct erofs_vnode *vi)
> +{
> + int ret;
> + char buf[EROFS_BLKSIZ];
> + struct erofs_inode_v1 *v1;
> + const erofs_off_t addr = nid2addr(nid);
> + const size_t size = EROFS_BLKSIZ - erofs_blkoff(addr);
> +
> + ret = dev_read(buf, size, addr);
> + if (ret != (int)size)
> + return -EIO;
> +
> + v1 = (struct erofs_inode_v1 *)buf;
> + vi->data_mapping_mode = __inode_data_mapping(le16_to_cpu(v1->i_advise));
> + vi->inode_isize = sizeof(struct erofs_inode_v1);
> + vi->xattr_isize = ondisk_xattr_ibody_size(v1->i_xattr_icount);
> + vi->i_size = le32_to_cpu(v1->i_size);
> + vi->i_mode = le16_to_cpu(v1->i_mode);
> + vi->i_uid = le16_to_cpu(v1->i_uid);
> + vi->i_gid = le16_to_cpu(v1->i_gid);
> + vi->i_nlink = le16_to_cpu(v1->i_nlink);
> + vi->nid = nid;
> +
> + switch (vi->i_mode & S_IFMT) {
> + case S_IFBLK:
> + case S_IFCHR:
> + /* fixme: add special devices support
> + * vi->i_rdev = new_decode_dev(le32_to_cpu(v1->i_u.rdev));
> + */
> + break;
> + case S_IFIFO:
> + case S_IFSOCK:
> + /*fixme: vi->i_rdev = 0; */
> + break;
> + case S_IFREG:
> + case S_IFLNK:
> + case S_IFDIR:
> + vi->raw_blkaddr = le32_to_cpu(v1->i_u.raw_blkaddr);
> + break;
> + default:
> + return -EIO;
> + }
> +
> + return 0;
> +}
> +
> +/* dirent + name string */
> +struct dcache_entry *list_name(const char *buf, struct dcache_entry *parent,
> + const char *name, unsigned int len)
> +{
> + struct dcache_entry *entry = NULL;
> + struct erofs_dirent *ds, *de;
> +
> + ds = (struct erofs_dirent *)buf;
> + de = (struct erofs_dirent *)(buf + le16_to_cpu(ds->nameoff));
> +
> + while (ds < de) {
> + erofs_nid_t nid = le64_to_cpu(ds->nid);
> + uint16_t nameoff = le16_to_cpu(ds->nameoff);
> + char *d_name = (char *)(buf + nameoff);
> + uint16_t name_len = (ds + 1 >= de) ? (uint16_t)strlen(d_name) :
> + le16_to_cpu(ds[1].nameoff) - nameoff;
> +
> + #if defined(EROFS_DEBUG_ENTRY)
> + {
> + char debug[EROFS_BLKSIZ];
> +
> + memcpy(debug, d_name, name_len);
> + debug[name_len] = '\0';
> + logi("list entry: %s nid=%u", debug, nid);
> + }
> + #endif
> +
> + entry = dcache_try_insert(parent, d_name, name_len, nid);
> + if (len == name_len && !memcmp(name, d_name, name_len))
> + return entry;
> +
> + entry = NULL;
> + ++ds;
> + }
> +
> + return entry;
> +}
> +
> +struct dcache_entry *disk_lookup(struct dcache_entry *parent, const char *name,
> + unsigned int name_len)
> +{
> + int ret;
> + char buf[EROFS_BLKSIZ];
> + struct dcache_entry *entry = NULL;
> + struct erofs_vnode v;
> + uint32_t nr_cnt, dir_nr, dirsize, blkno;
> +
> + ret = erofs_iget_by_nid(parent->nid, &v);
> + if (ret)
> + return NULL;
> +
> + /* to check whether dirent is in the inline dirs */
> + blkno = v.raw_blkaddr;
> + dirsize = v.i_size;
> + dir_nr = erofs_blknr(dirsize);
> +
> + nr_cnt = 0;
> + while (nr_cnt < dir_nr) {
> + if (dev_read_blk(buf, blkno + nr_cnt) != EROFS_BLKSIZ)
> + return NULL;
> +
> + entry = list_name(buf, parent, name, name_len);
> + if (entry)
> + goto next;
> +
> + ++nr_cnt;
> + }
> +
> + if (v.data_mapping_mode == EROFS_INODE_FLAT_INLINE) {
> + uint32_t dir_off = erofs_blkoff(dirsize);
> + off_t dir_addr = nid2addr(dcache_get_nid(parent))
> + + sizeof(struct erofs_inode_v1);
> +
> + memset(buf, 0, sizeof(buf));
> + ret = dev_read(buf, dir_off, dir_addr);
> + if (ret < 0 && (uint32_t)ret != dir_off)
> + return NULL;
> +
> + entry = list_name(buf, parent, name, name_len);
> + }
> +next:
> + return entry;
> +}
> +
> +extern struct dcache_entry root_entry;
> +int walk_path(const char *_path, erofs_nid_t *out_nid)
> +{
> + struct dcache_entry *next, *ret;
> + const char *path = _path;
> +
> + ret = next = &root_entry;
> + for (;;) {
> + uint8_t path_len;
> +
> + path = skip_trailing_backslash(path);
> + path_len = get_path_token_len(path);
> + ret = next;
> + if (path_len == 0)
> + break;
> +
> + next = dcache_lookup(ret, path, path_len);
> + if (!next) {
> + next = disk_lookup(ret, path, path_len);
> + if (!next)
> + return -ENOENT;
> + }
> +
> + path += path_len;
> + }
> +
> + if (!ret)
> + return -ENOENT;
> + logd("find path = %s nid=%u", _path, ret->nid);
> +
> + *out_nid = ret->nid;
> + return 0;
> +
> +}
> +
> +int erofs_iget_by_path(const char *path, struct erofs_vnode *v)
> +{
> + int ret;
> + erofs_nid_t nid;
> +
> + ret = walk_path(path, &nid);
> + if (ret)
> + return ret;
> +
> + return erofs_iget_by_nid(nid, v);
> +}
> +
> +int inode_init(erofs_nid_t root)
> +{
> + dcache_init_root(root);
> +
> + return 0;
> +}
> +
> diff --git a/fuse/namei.h b/fuse/namei.h
> new file mode 100644
> index 0000000..80e84d7
> --- /dev/null
> +++ b/fuse/namei.h
> @@ -0,0 +1,22 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * erofs-fuse\inode.h
> + * Created by Li Guifu <blucerlee at gmail.com>
> + */
> +
> +#ifndef __INODE_H
> +#define __INODE_H
> +
> +#include "erofs/internal.h"
> +#include "erofs_fs.h"
> +
> +int inode_init(erofs_nid_t root);
> +struct dcache_entry *get_cached_dentry(struct dcache_entry **parent,
> + const char **path);
> +int erofs_iget_by_path(const char *path, struct erofs_vnode *v);
> +int erofs_iget_by_nid(erofs_nid_t nid, struct erofs_vnode *v);
> +struct dcache_entry *disk_lookup(struct dcache_entry *parent, const char *name,
> + unsigned int name_len);
> +int walk_path(const char *path, erofs_nid_t *out_nid);
> +
> +#endif
> diff --git a/fuse/open.c b/fuse/open.c
> new file mode 100644
> index 0000000..9d2edca
> --- /dev/null
> +++ b/fuse/open.c
> @@ -0,0 +1,22 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * erofs-fuse\open.c
> + * Created by Li Guifu <blucerlee at gmail.com>
> + */
> +
> +#include "open.h"
> +#include <asm-generic/errno-base.h>
> +#include <fuse.h>
> +#include <fuse_opt.h>
> +#include "logging.h"
> +
> +int erofs_open(const char *path, struct fuse_file_info *fi)
> +{
> + logi("open path=%s", path);
> +
> + if ((fi->flags & O_ACCMODE) != O_RDONLY)
> + return -EACCES;
> +
> + return 0;
> +}
> +
> diff --git a/fuse/open.h b/fuse/open.h
> new file mode 100644
> index 0000000..d02c1f7
> --- /dev/null
> +++ b/fuse/open.h
> @@ -0,0 +1,15 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * erofs-fuse\open.h
> + * Created by Li Guifu <blucerlee at gmail.com>
> + */
> +
> +#ifndef __EROFS_OPEN_H
> +#define __EROFS_OPEN_H
> +
> +#include <fuse.h>
> +#include <fuse_opt.h>
> +
> +int erofs_open(const char *path, struct fuse_file_info *fi);
> +
> +#endif
> diff --git a/fuse/read.c b/fuse/read.c
> new file mode 100644
> index 0000000..b2bfbd3
> --- /dev/null
> +++ b/fuse/read.c
> @@ -0,0 +1,114 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * erofs-fuse\read.c
> + * Created by Li Guifu <blucerlee at gmail.com>
> + */
> +
> +#include "read.h"
> +#include <errno.h>
> +#include <linux/fs.h>
> +#include <sys/stat.h>
> +#include <string.h>
> +
> +#include "erofs/defs.h"
> +#include "erofs/internal.h"
> +#include "logging.h"
> +#include "namei.h"
> +#include "disk_io.h"
> +#include "init.h"
> +
> +size_t erofs_read_data(struct erofs_vnode *vnode, char *buffer,
> + size_t size, off_t offset)
> +{
> + int ret;
> + size_t sum, rdsz = 0;
> + uint32_t addr = blknr_to_addr(vnode->raw_blkaddr) + offset;
> +
> + sum = (offset + size) > vnode->i_size ?
> + (size_t)(vnode->i_size - offset) : size;
> + while (rdsz < sum) {
> + size_t count = min(EROFS_BLKSIZ, (uint32_t)(sum - rdsz));
> +
> + ret = dev_read(buffer + rdsz, count, addr + rdsz);
> + if (ret < 0 || (size_t)ret != count)
> + return -EIO;
> + rdsz += count;
> + }
> +
> + logi("nid:%u size=%zd offset=%llu realsize=%zd done",
> + vnode->nid, size, (long long)offset, rdsz);
> + return rdsz;
> +
> +}
> +
> +size_t erofs_read_data_inline(struct erofs_vnode *vnode, char *buffer,
> + size_t size, off_t offset)
> +{
> + int ret;
> + size_t sum, suminline, rdsz = 0;
> + uint32_t addr = blknr_to_addr(vnode->raw_blkaddr) + offset;
> + uint32_t szblk = vnode->i_size - erofs_blkoff(vnode->i_size);
> +
> + sum = (offset + size) > szblk ? (size_t)(szblk - offset) : size;
> + suminline = size - sum;
> +
> + while (rdsz < sum) {
> + size_t count = min(EROFS_BLKSIZ, (uint32_t)(sum - rdsz));
> +
> + ret = dev_read(buffer + rdsz, count, addr + rdsz);
> + if (ret < 0 || (uint32_t)ret != count)
> + return -EIO;
> + rdsz += count;
> + }
> +
> + if (!suminline)
> + goto finished;
> +
> + addr = nid2addr(vnode->nid) + sizeof(struct erofs_inode_v1)
> + + vnode->xattr_isize;
> + ret = dev_read(buffer + rdsz, suminline, addr);
> + if (ret < 0 || (size_t)ret != suminline)
> + return -EIO;
> + rdsz += suminline;
> +
> +finished:
> + logi("nid:%u size=%zd suminline=%u offset=%llu realsize=%zd done",
> + vnode->nid, size, suminline, (long long)offset, rdsz);
> + return rdsz;
> +
> +}
> +
> +
> +int erofs_read(const char *path, char *buffer, size_t size, off_t offset,
> + struct fuse_file_info *fi)
> +{
> + int ret;
> + erofs_nid_t nid;
> + struct erofs_vnode v;
> +
> + UNUSED(fi);
> + logi("path:%s size=%zd offset=%llu", path, size, (long long)offset);
> +
> + ret = walk_path(path, &nid);
> + if (ret)
> + return ret;
> +
> + ret = erofs_iget_by_nid(nid, &v);
> + if (ret)
> + return ret;
> +
> + logi("path:%s nid=%llu mode=%u", path, nid, v.data_mapping_mode);
> + switch (v.data_mapping_mode) {
> + case EROFS_INODE_FLAT_PLAIN:
> + return erofs_read_data(&v, buffer, size, offset);
> +
> + case EROFS_INODE_FLAT_INLINE:
> + return erofs_read_data_inline(&v, buffer, size, offset);
> +
> + case EROFS_INODE_FLAT_COMPRESSION_LEGACY:
> + case EROFS_INODE_FLAT_COMPRESSION:
> + /* Fixme: */
> + default:
> + return -EINVAL;
> + }
> +}
> diff --git a/fuse/read.h b/fuse/read.h
> new file mode 100644
> index 0000000..f2fcebe
> --- /dev/null
> +++ b/fuse/read.h
> @@ -0,0 +1,16 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * erofs-fuse\read.h
> + * Created by Li Guifu <blucerlee at gmail.com>
> + */
> +
> +#ifndef __EROFS_READ_H
> +#define __EROFS_READ_H
> +
> +#include <fuse.h>
> +#include <fuse_opt.h>
> +
> +int erofs_read(const char *path, char *buffer, size_t size, off_t offset,
> + struct fuse_file_info *fi);
> +
> +#endif
> diff --git a/fuse/readir.c b/fuse/readir.c
> new file mode 100644
> index 0000000..7fc69f4
> --- /dev/null
> +++ b/fuse/readir.c
> @@ -0,0 +1,121 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * erofs-fuse\readir.c
> + * Created by Li Guifu <blucerlee at gmail.com>
> + */
> +
> +#include "readir.h"
> +#include <errno.h>
> +#include <linux/fs.h>
> +#include <sys/stat.h>
> +
> +#include "erofs/defs.h"
> +#include "erofs/internal.h"
> +#include "erofs_fs.h"
> +#include "namei.h"
> +#include "disk_io.h"
> +#include "logging.h"
> +#include "init.h"
> +
> +erofs_nid_t split_entry(char *entry, off_t ofs, char *end, char *name)
> +{
> + struct erofs_dirent *de = (struct erofs_dirent *)(entry + ofs);
> + uint16_t nameoff = le16_to_cpu(de->nameoff);
> + const char *de_name = entry + nameoff;
> + uint32_t de_namelen;
> +
> + if ((void *)(de + 1) >= (void *)end)
> + de_namelen = strlen(de_name);
> + else
> + de_namelen = le16_to_cpu(de[1].nameoff) - nameoff;
> +
> + memcpy(name, de_name, de_namelen);
> + name[de_namelen] = '\0';
> + return le64_to_cpu(de->nid);
> +}
> +
> +int fill_dir(char *entrybuf, fuse_fill_dir_t filler, void *buf)
> +{
> + uint32_t ofs;
> + uint16_t nameoff;
> + char *end;
> + char name[EROFS_BLKSIZ];
> +
> + nameoff = le16_to_cpu(((struct erofs_dirent *)entrybuf)->nameoff);
> + end = entrybuf + nameoff;
> + ofs = 0;
> + while (ofs < nameoff) {
> + (void)split_entry(entrybuf, ofs, end, name);
> + filler(buf, name, NULL, 0);
> + ofs += sizeof(struct erofs_dirent);
> + }
> +
> + return 0;
> +}
> +
> +/** Function to add an entry in a readdir() operation
> + *
> + * @param buf the buffer passed to the readdir() operation
> + * @param name the file name of the directory entry
> + * @param stat file attributes, can be NULL
> + * @param off offset of the next entry or zero
> + * @return 1 if buffer is full, zero otherwise
> + */
> +int erofs_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
> + off_t offset, struct fuse_file_info *fi)
> +{
> + int ret;
> + erofs_nid_t nid;
> + struct erofs_vnode v;
> + char dirsbuf[EROFS_BLKSIZ];
> + uint32_t dir_nr, dir_off, nr_cnt;
> +
> + logd("readdir:%s offset=%llu", path, (long long)offset);
> + UNUSED(fi);
> +
> + ret = walk_path(path, &nid);
> + if (ret)
> + return ret;
> +
> + logd("path=%s nid = %u", path, nid);
> + ret = erofs_iget_by_nid(nid, &v);
> + if (ret)
> + return ret;
> +
> + if (!S_ISDIR(v.i_mode))
> + return -ENOTDIR;
> +
> + if (!v.i_size)
> + return 0;
> +
> + dir_nr = erofs_blknr(v.i_size);
> + dir_off = erofs_blkoff(v.i_size);
> + nr_cnt = 0;
> +
> + logd("dir_size=%u dir_nr = %u dir_off=%u", v.i_size, dir_nr, dir_off);
> +
> + while (nr_cnt < dir_nr) {
> + memset(dirsbuf, 0, sizeof(dirsbuf));
> + ret = dev_read_blk(dirsbuf, v.raw_blkaddr + nr_cnt);
> + if (ret != EROFS_BLKSIZ)
> + return -EIO;
> + fill_dir(dirsbuf, filler, buf);
> + ++nr_cnt;
> + }
> +
> + if (v.data_mapping_mode == EROFS_INODE_FLAT_INLINE) {
> + off_t addr;
> +
> + addr = nid2addr(nid) + sizeof(struct erofs_inode_v1)
> + + v.xattr_isize;
> +
> + memset(dirsbuf, 0, sizeof(dirsbuf));
> + ret = dev_read(dirsbuf, dir_off, addr);
> + if (ret < 0 || (uint32_t)ret != dir_off)
> + return -EIO;
> + fill_dir(dirsbuf, filler, buf);
> + }
> +
> + return 0;
> +}
> +
> diff --git a/fuse/readir.h b/fuse/readir.h
> new file mode 100644
> index 0000000..21ab7a4
> --- /dev/null
> +++ b/fuse/readir.h
> @@ -0,0 +1,17 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * erofs-fuse\readir.h
> + * Created by Li Guifu <blucerlee at gmail.com>
> + */
> +
> +#ifndef __EROFS_READDIR_H
> +#define __EROFS_READDIR_H
> +
> +#include <fuse.h>
> +#include <fuse_opt.h>
> +
> +int erofs_readdir(const char *path, void *buffer, fuse_fill_dir_t filler,
> + off_t offset, struct fuse_file_info *fi);
> +
> +
> +#endif
> diff --git a/include/erofs/defs.h b/include/erofs/defs.h
> index 0d9910c..19585a2 100644
> --- a/include/erofs/defs.h
> +++ b/include/erofs/defs.h
> @@ -24,6 +24,9 @@
> #ifdef HAVE_LINUX_TYPES_H
> #include <linux/types.h>
> #endif
> +#ifndef UNUSED
> +#define UNUSED(_X) ((void) _X)
> +#endif
>
> /*
> * container_of - cast a member of a structure out to the containing structure
> diff --git a/include/erofs/internal.h b/include/erofs/internal.h
> index 33a72b5..b8ba88c 100644
> --- a/include/erofs/internal.h
> +++ b/include/erofs/internal.h
> @@ -45,6 +45,8 @@ typedef u32 erofs_blk_t;
> #define blknr_to_addr(nr) ((erofs_off_t)(nr) * EROFS_BLKSIZ)
>
> #define BLK_ROUND_UP(addr) DIV_ROUND_UP(addr, EROFS_BLKSIZ)
> +#define IS_SLOT_ALIGN(__ADDR) (((__ADDR) % (EROFS_SLOTSIZE)) ? 0 : 1)
> +#define IS_BLK_ALIGN(__ADDR) (((__ADDR) % (EROFS_BLKSIZ)) ? 0 : 1)
>
> struct erofs_buffer_head;
>
> @@ -98,11 +100,46 @@ struct erofs_inode {
> void *compressmeta;
> };
>
> +struct erofs_vnode {
> + uint8_t data_mapping_mode;
> +
> + uint32_t i_size;
> + /* inline size in bytes */
> + uint16_t inode_isize;
> + uint16_t xattr_isize;
> +
> + uint16_t xattr_shared_count;
> + char *xattr_shared_xattrs;
> +
> + erofs_blk_t raw_blkaddr;
> + erofs_nid_t nid;
> + uint32_t i_ino;
> +
> + uint16_t i_mode;
> + uint16_t i_uid;
> + uint16_t i_gid;
> + uint16_t i_nlink;
> +
> + /* if file is inline read inline data witch inode */
> + char *idata;
> +};
> +
> static inline bool is_inode_layout_compression(struct erofs_inode *inode)
> {
> return erofs_inode_is_data_compressed(inode->data_mapping_mode);
> }
>
> +#define __inode_advise(x, bit, bits) \
> + (((x) >> (bit)) & ((1 << (bits)) - 1))
> +
> +#define __inode_version(advise) \
> + __inode_advise(advise, EROFS_I_VERSION_BIT, \
> + EROFS_I_VERSION_BITS)
> +
> +#define __inode_data_mapping(advise) \
> + __inode_advise(advise, EROFS_I_DATA_MAPPING_BIT,\
> + EROFS_I_DATA_MAPPING_BITS)
> +
> #define IS_ROOT(x) ((x) == (x)->i_parent)
>
> struct erofs_dentry {
> --
> 2.17.1
>
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