[PATCH 2/3] erofs-utils: dump: add -i options to dump file information of specific inode number
Gao Xiang
hsiangkao at linux.alibaba.com
Wed Oct 27 23:23:22 AEDT 2021
On Wed, Oct 27, 2021 at 08:03:50PM +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>
> ---
> dump/main.c | 135 +++++++++++++++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 134 insertions(+), 1 deletion(-)
>
> diff --git a/dump/main.c b/dump/main.c
> index 98ee68b..8a31345 100644
> --- a/dump/main.c
> +++ b/dump/main.c
> @@ -17,8 +17,10 @@
>
> struct erofsdump_cfg {
> unsigned int totalshow;
> + bool show_inode;
> bool show_superblock;
> bool show_statistics;
> + u64 ino;
erofs_nid_t nid;
> };
> static struct erofsdump_cfg dumpcfg;
>
> @@ -82,6 +84,9 @@ static struct erofsdump_feature feature_lists[] = {
> };
>
> static int erofs_read_dir(erofs_nid_t nid, erofs_nid_t parent_nid);
> +static inline int erofs_checkdirent(struct erofs_dirent *de,
> + struct erofs_dirent *last_de,
> + u32 maxsize, const char *dname);
>
> static void usage(void)
> {
> @@ -89,6 +94,7 @@ static void usage(void)
> "Dump erofs layout from IMAGE, and [options] are:\n"
> " -S show statistic information of the image\n"
> " -V print the version number of dump.erofs and exit.\n"
> + " -i # show the target inode info of nid #\n"
> " -s show information about superblock\n"
> " --help display this help and exit.\n",
> stderr);
> @@ -102,10 +108,17 @@ static void erofsdump_print_version(void)
> static int erofsdump_parse_options_cfg(int argc, char **argv)
> {
> int opt;
> + u64 i;
erofs_nid_t i;
>
> - while ((opt = getopt_long(argc, argv, "SVs",
> + while ((opt = getopt_long(argc, argv, "SVi:s",
> long_options, NULL)) != -1) {
> switch (opt) {
> + case 'i':
I perfer "--nid" for this, since the inode number is actually the field
in the on-disk inode (Although we report nid for now.)
> + i = atoll(optarg);
> + dumpcfg.show_inode = true;
> + dumpcfg.ino = i;
> + ++dumpcfg.totalshow;
> + break;
> case 's':
> dumpcfg.show_superblock = true;
> ++dumpcfg.totalshow;
> @@ -331,6 +344,123 @@ static int erofs_read_dir(erofs_nid_t nid, erofs_nid_t parent_nid)
> return 0;
> }
>
> +static int erofs_get_pathname(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);
> + end = (void *)buf + nameoff;
> + while (de < end) {
> + const char *dname;
> + int len;
> +
> + nameoff = le16_to_cpu(de->nameoff);
> + dname = (char *)buf + nameoff;
> + len = erofs_checkdirent(de, end, maxsize, dname);
> + if (len < 0)
> + return len;
> +
> + if (de->nid == target) {
> + memcpy(path + pos, dname, len);
> + return 0;
> + }
> +
> + if (de->file_type == EROFS_FT_DIR &&
> + de->nid != parent_nid &&
> + de->nid != nid) {
> + memcpy(path + pos, dname, len);
> + err = erofs_get_pathname(de->nid, nid,
> + target, path, pos + len);
> + if (!err)
> + return 0;
> + memset(path + pos, 0, 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";
> + char timebuf[128] = {0};
> +
> + err = erofs_read_inode_from_disk(&inode);
> + if (err) {
> + erofs_err("read inode %lu from disk failed", nid);
> + return;
> + }
> +
> + err = erofs_get_occupied_size(&inode, &size);
> + if (err) {
> + erofs_err("get file size failed\n");
> + return;
> + }
> +
> + err = erofs_get_pathname(sbi.root_nid, sbi.root_nid, nid, path, 0);
> + if (err < 0) {
> + fprintf(stderr, "File: Path not found.\n");
> + return;
> + }
> +
> + fprintf(stdout, "File : %s\n", path);
> + fprintf(stdout, "Inode: %lu ", inode.nid);
> + fprintf(stdout, "Links: %u ", inode.i_nlink);
> + fprintf(stdout, "Layout: %d\n", inode.datalayout);
> + fprintf(stdout, "File size: %lu ", inode.i_size);
> + fprintf(stdout, "On-disk size: %lu ", size);
> + fprintf(stdout, "Compress rate: %.2f%%\n",
> + (double)(100 * size) / (double)(inode.i_size));
> + fprintf(stdout, "Inode size: %d ", inode.inode_isize);
> + fprintf(stdout, "Extent size: %u ", inode.extent_isize);
> + fprintf(stdout, "Xattr size: %u\n", inode.xattr_isize);
> + access_mode = inode.i_mode & 0777;
> + t = inode.i_ctime;
Only extented inodes have their own timestamps.
> + strftime(timebuf, sizeof(timebuf),
> + "%Y-%m-%d %H:%M:%S", localtime(&t));
place
access_mode = inode.i_mode & 0777;
here.
> + for (int i = 8; i >= 0; i--)
> + if (((access_mode >> i) & 1) == 0)
> + access_mode_str[8 - i] = '-';
> + fprintf(stdout, "Uid: %u Gid: %u ", inode.i_uid, inode.i_gid);
> + fprintf(stdout, "Access: %04o/%s\n", access_mode, access_mode_str);
> + fprintf(stdout, "Birth : %s\n", timebuf);
"Timestamp :" here is preferred.
Thanks,
Gao Xiang
> +}
> +
> static void erofsdump_print_chart_row(char *col1, unsigned int col2,
> double col3, char *col4)
> {
> @@ -512,6 +642,9 @@ int main(int argc, char **argv)
> if (dumpcfg.show_statistics)
> erofsdump_print_statistic();
>
> + if (dumpcfg.show_inode)
> + dumpfs_print_inode();
> +
> exit:
> erofs_exit_configure();
> return err;
> --
> 2.31.1
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