[PATCH v2 4/5] dump.erofs: add -i options to dump file information of specific inode number
Guo Xuenan
guoxuenan at huawei.com
Tue Sep 14 17:44:23 AEST 2021
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 | 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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