[PATCH v1 4/5] dump.erofs: add -i options to dump file information of specific inode number
Guo Xuenan
guoxuenan at huawei.com
Sat Sep 11 23:46:34 AEST 2021
From: mpiglet <mpiglet at outlook.com>
Signed-off-by: Guo Xuenan <guoxuenan at huawei.com>
Signed-off-by: mpiglet <mpiglet at outlook.com>
---
dump/main.c | 202 +++++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 200 insertions(+), 2 deletions(-)
diff --git a/dump/main.c b/dump/main.c
index b0acc0b..2389cef 100644
--- a/dump/main.c
+++ b/dump/main.c
@@ -19,8 +19,10 @@
struct dumpcfg {
bool print_superblock;
+ bool print_inode;
bool print_statistic;
bool print_version;
+ u64 ino;
};
static struct dumpcfg dumpcfg;
@@ -100,8 +102,9 @@ static void usage(void)
{
fputs("usage: [options] erofs-image \n\n"
"Dump erofs layout from erofs-image, and [options] are:\n"
- "-s print information about superblock\n"
- "-S print statistic information of the erofs-image\n"
+ "-s print information about superblock\n"
+ "-S print statistic information of the erofs-image\n"
+ "-i # print target # inode info\n"
"-v/-V print dump.erofs version info\n"
"-h/--help display this help and exit\n", stderr);
}
@@ -113,6 +116,7 @@ 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, "sSvVi:I:h",
long_options, NULL)) != -1) {
@@ -127,6 +131,11 @@ static int dumpfs_parse_options_cfg(int argc, char **argv)
case 'V':
dumpfs_print_version();
exit(0);
+ case 'i':
+ i = atoll(optarg);
+ dumpcfg.print_inode = true;
+ dumpcfg.ino = i;
+ break;
case 'h':
case 1:
usage();
@@ -293,6 +302,193 @@ static void dumpfs_print_superblock(void)
}
+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;
+ erofs_nid_t nid = dumpcfg.ino;
+ struct erofs_inode inode = {.nid = nid};
+ char path[PATH_MAX + 1] = {0};
+ time_t t = inode.i_ctime;
+
+ err = erofs_read_inode_from_disk(&inode);
+ if (err) {
+ erofs_err("read inode %lu from disk failed", nid);
+ return;
+ }
+
+ fprintf(stderr, "Inode %lu info:\n", dumpcfg.ino);
+ switch (inode.inode_isize) {
+ case 32:
+ fprintf(stderr, " File inode is compacted layout\n");
+ break;
+ case 64:
+ fprintf(stderr, " File inode is extended layout\n");
+ break;
+ default:
+ erofs_err("unsupported inode layout\n");
+ }
+ fprintf(stderr, " File size: %lu\n",
+ inode.i_size);
+ fprintf(stderr, " File nid: %lu\n",
+ inode.nid);
+ fprintf(stderr, " File extent size: %u\n",
+ inode.extent_isize);
+ fprintf(stderr, " File xattr size: %u\n",
+ inode.xattr_isize);
+ fprintf(stderr, " File inode size: %u\n",
+ inode.inode_isize);
+ fprintf(stderr, " File type: ");
+ switch (inode.i_mode & S_IFMT) {
+ case S_IFREG:
+ fprintf(stderr, "regular\n");
+ break;
+ case S_IFDIR:
+ fprintf(stderr, "directory\n");
+ break;
+ case S_IFLNK:
+ fprintf(stderr, "link\n");
+ break;
+ case S_IFCHR:
+ fprintf(stderr, "character device\n");
+ break;
+ case S_IFBLK:
+ fprintf(stderr, "block device\n");
+ break;
+ case S_IFIFO:
+ fprintf(stderr, "fifo\n");
+ break;
+ case S_IFSOCK:
+ fprintf(stderr, "sock\n");
+ break;
+ default:
+ break;
+ }
+
+ err = get_file_compressed_size(&inode, &size);
+ if (err) {
+ erofs_err("get file size failed\n");
+ return;
+ }
+
+ fprintf(stderr, " File original size: %lu\n"
+ " File on-disk size: %lu\n",
+ inode.i_size, size);
+ fprintf(stderr, " File compress rate: %.2f%%\n",
+ (double)(100 * size) / (double)(inode.i_size));
+
+ fprintf(stderr, " File datalayout: ");
+ switch (inode.datalayout) {
+ case EROFS_INODE_FLAT_PLAIN:
+ fprintf(stderr, "EROFS_INODE_FLAT_PLAIN\n");
+ break;
+ case EROFS_INODE_FLAT_COMPRESSION_LEGACY:
+ fprintf(stderr, "EROFS_INODE_FLAT_COMPRESSION_LEGACY\n");
+ break;
+ case EROFS_INODE_FLAT_INLINE:
+ fprintf(stderr, "EROFS_INODE_FLAT_INLINE\n");
+ break;
+ case EROFS_INODE_FLAT_COMPRESSION:
+ fprintf(stderr, "EROFS_INODE_FLAT_COMPRESSION\n");
+ break;
+ default:
+ break;
+ }
+
+ fprintf(stderr, " File create time: %s", ctime(&t));
+ fprintf(stderr, " File uid: %u\n", inode.i_uid);
+ fprintf(stderr, " File gid: %u\n", inode.i_gid);
+ fprintf(stderr, " File hard-link count: %u\n", inode.i_nlink);
+
+ err = get_path_by_nid(sbi.root_nid, sbi.root_nid, nid, path, 0);
+ if (!err)
+ fprintf(stderr, " File path: %s\n", path);
+ else
+ fprintf(stderr, "Path not found\n");
+}
+
static int get_file_type(const char *filename)
{
char *postfix = strrchr(filename, '.');
@@ -611,6 +807,8 @@ int main(int argc, char **argv)
if (dumpcfg.print_statistic)
dumpfs_print_statistic();
+ if (dumpcfg.print_inode)
+ dumpfs_print_inode();
return 0;
}
--
2.25.4
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