[PATCH v2 4/5] dump.erofs: add -i options to dump file information of specific inode number
Gao Xiang
hsiangkao at linux.alibaba.com
Tue Sep 14 23:20:16 AEST 2021
On Tue, Sep 14, 2021 at 03:44:23PM +0800, Guo Xuenan wrote:
> From: Wang Qi <mpiglet at outlook.com>
>
> Signed-off-by: Guo Xuenan <guoxuenan at huawei.com>
> Signed-off-by: Wang Qi <mpiglet at outlook.com>
Just a rough check, it still doesn't handle hardlink, but that is fine
anyway.
I think if the first patches get into shape, we could merge them in
advance.
Also, I'd like to add a feature to get the independent file
distribution in the fiemap-likewise form, which is useful to debug some
specific compressed files (by using the patch Jianan backported before.)
Thanks,
Gao Xiang
> ---
> dump/main.c | 161 +++++++++++++++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 159 insertions(+), 2 deletions(-)
>
> diff --git a/dump/main.c b/dump/main.c
> index 0778354..233de50 100644
> --- a/dump/main.c
> +++ b/dump/main.c
> @@ -21,8 +21,10 @@
>
> struct dumpcfg {
> bool print_superblock;
> + bool print_inode;
> bool print_statistic;
> bool print_version;
> + u64 ino;
> };
> static struct dumpcfg dumpcfg;
>
> @@ -109,8 +111,9 @@ static void usage(void)
> fputs("usage: [options] erofs-image\n\n"
> "Dump erofs layout from erofs-image, and [options] are:\n"
> "--help display this help and exit.\n"
> - "-s print information about superblock\n"
> + "-s print information about superblock\n"
> "-S print statistic information of the erofs-image\n"
> + "-i # print target # inode info\n"
> "-V print the version number of dump.erofs and exit.\n",
> stdout);
> }
> @@ -123,10 +126,16 @@ static void dumpfs_print_version(void)
> static int dumpfs_parse_options_cfg(int argc, char **argv)
> {
> int opt;
> + u64 i;
>
> - while ((opt = getopt_long(argc, argv, "sSV",
> + while ((opt = getopt_long(argc, argv, "i:sSV",
> long_options, NULL)) != -1) {
> switch (opt) {
> + case 'i':
> + i = atoll(optarg);
> + dumpcfg.print_inode = true;
> + dumpcfg.ino = i;
> + break;
> case 's':
> dumpcfg.print_superblock = true;
> break;
> @@ -179,6 +188,151 @@ static int get_file_compressed_size(struct erofs_inode *inode,
> }
> return 0;
> }
> +static int get_path_by_nid(erofs_nid_t nid, erofs_nid_t parent_nid,
> + erofs_nid_t target, char *path, unsigned int pos)
> +{
> + int err;
> + struct erofs_inode inode = {.nid = nid};
> + erofs_off_t offset;
> + char buf[EROFS_BLKSIZ];
> +
> + path[pos++] = '/';
> + if (target == sbi.root_nid)
> + return 0;
> +
> + err = erofs_read_inode_from_disk(&inode);
> + if (err) {
> + erofs_err("read inode %lu failed", nid);
> + return err;
> + }
> +
> + offset = 0;
> + while (offset < inode.i_size) {
> + erofs_off_t maxsize = min_t(erofs_off_t,
> + inode.i_size - offset, EROFS_BLKSIZ);
> + struct erofs_dirent *de = (void *)buf;
> + struct erofs_dirent *end;
> + unsigned int nameoff;
> +
> + err = erofs_pread(&inode, buf, maxsize, offset);
> + if (err)
> + return err;
> +
> + nameoff = le16_to_cpu(de->nameoff);
> + if (nameoff < sizeof(struct erofs_dirent) ||
> + nameoff >= PAGE_SIZE) {
> + erofs_err("invalid de[0].nameoff %u @ nid %llu",
> + nameoff, nid | 0ULL);
> + return -EFSCORRUPTED;
> + }
> +
> + end = (void *)buf + nameoff;
> + while (de < end) {
> + const char *dname;
> + unsigned int dname_len;
> +
> + nameoff = le16_to_cpu(de->nameoff);
> + dname = (char *)buf + nameoff;
> + if (de + 1 >= end)
> + dname_len = strnlen(dname, maxsize - nameoff);
> + else
> + dname_len = le16_to_cpu(de[1].nameoff)
> + - nameoff;
> +
> + /* a corrupted entry is found */
> + if (nameoff + dname_len > maxsize ||
> + dname_len > EROFS_NAME_LEN) {
> + erofs_err("bogus dirent @ nid %llu",
> + le64_to_cpu(de->nid) | 0ULL);
> + DBG_BUGON(1);
> + return -EFSCORRUPTED;
> + }
> +
> + if (de->nid == target) {
> + memcpy(path + pos, dname, dname_len);
> + return 0;
> + }
> +
> + if (de->file_type == EROFS_FT_DIR &&
> + de->nid != parent_nid &&
> + de->nid != nid) {
> + memcpy(path + pos, dname, dname_len);
> + err = get_path_by_nid(de->nid, nid,
> + target, path, pos + dname_len);
> + if (!err)
> + return 0;
> + memset(path + pos, 0, dname_len);
> + }
> + ++de;
> + }
> + offset += maxsize;
> + }
> + return -1;
> +}
> +
> +static void dumpfs_print_inode(void)
> +{
> + int err;
> + erofs_off_t size;
> + u16 access_mode;
> + time_t t;
> + erofs_nid_t nid = dumpcfg.ino;
> + struct erofs_inode inode = {.nid = nid};
> + char path[PATH_MAX + 1] = {0};
> + char access_mode_str[] = "rwxrwxrwx";
> +
> + err = erofs_read_inode_from_disk(&inode);
> + if (err) {
> + erofs_err("read inode %lu from disk failed", nid);
> + return;
> + }
> +
> + err = get_file_compressed_size(&inode, &size);
> + if (err) {
> + erofs_err("get file size failed\n");
> + return;
> + }
> +
> + fprintf(stdout, "Inode %lu info:\n", dumpcfg.ino);
> + err = get_path_by_nid(sbi.root_nid, sbi.root_nid, nid, path, 0);
> +
> + fprintf(stdout, "File path: %s\n",
> + !err ? path : "path not found");
> + fprintf(stdout, "File nid: %lu\n", inode.nid);
> + fprintf(stdout, "File inode core size: %d\n", inode.inode_isize);
> + fprintf(stdout, "File original size: %lu\n", inode.i_size);
> + fprintf(stdout, "File on-disk size: %lu\n", size);
> + fprintf(stdout, "File compress rate: %.2f%%\n",
> + (double)(100 * size) / (double)(inode.i_size));
> + fprintf(stdout, "File extent size: %u\n", inode.extent_isize);
> + fprintf(stdout, "File xattr size: %u\n", inode.xattr_isize);
> + fprintf(stdout, "File type: ");
> + switch (inode.i_mode & S_IFMT) {
> + case S_IFBLK: fprintf(stdout, "block device\n"); break;
> + case S_IFCHR: fprintf(stdout, "character device\n"); break;
> + case S_IFDIR: fprintf(stdout, "directory\n"); break;
> + case S_IFIFO: fprintf(stdout, "FIFO/pipe\n"); break;
> + case S_IFLNK: fprintf(stdout, "symlink\n"); break;
> + case S_IFREG: fprintf(stdout, "regular file\n"); break;
> + case S_IFSOCK: fprintf(stdout, "socket\n"); break;
> + default: fprintf(stdout, "unknown?\n"); break;
> + }
> +
> + access_mode = inode.i_mode & 0777;
> + t = inode.i_ctime;
> + for (int i = 8; i >= 0; i--)
> + if (((access_mode >> i) & 1) == 0)
> + access_mode_str[8 - i] = '-';
> + fprintf(stdout, "File access: %04o/%s\n",
> + access_mode, access_mode_str);
> + fprintf(stdout, "File uid: %u\n", inode.i_uid);
> + fprintf(stdout, "File gid: %u\n", inode.i_gid);
> + fprintf(stdout, "File datalayout: %d\n", inode.datalayout);
> + fprintf(stdout, "File nlink: %u\n", inode.i_nlink);
> + fprintf(stdout, "File create time: %s", ctime(&t));
> + fprintf(stdout, "File access time: %s", ctime(&t));
> + fprintf(stdout, "File modify time: %s", ctime(&t));
> +}
>
> static int get_file_type(const char *filename)
> {
> @@ -514,6 +668,9 @@ int main(int argc, char **argv)
>
> if (dumpcfg.print_statistic)
> dumpfs_print_statistic();
> +
> + if (dumpcfg.print_inode)
> + dumpfs_print_inode();
> out:
> if (cfg.c_img_path)
> free(cfg.c_img_path);
> --
> 2.25.4
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