Using debugfs to check free inodes (list got from dumpe2fs), I observed that most of them have a bad type status, except for a few ones which are regular. I'd like to check them all to see how many and which of them have a different status.
Therefore I made a little python/pexpect program which starts debugfs and interactively sends stat <inode> requests for all those free inodes to find which or them have other that bad type status.
However, it appears that my program is going to need about 2 years to get all the requested information. What faster way could I use to get those inodes content ?
Optionally, I would be glad to get information about why free inodes can have a regular status
Since I didn't get any simple solution, I ended up patching debugfs by adding a new function do_rstat based on do_stat in debugfs/debugfs.c. Kind of like this :
void do_rstat(int argc, char *argv[])
{
ext3_ino_t ifrom, ito, inode;
struct ext3_inode * inode_buf;
errcode_t r;
if (argc<4) {
fprintf(stderr, "do_rstat: needs an inodes range (3 arguments).\n");
return;
}
if (check_fs_open(argv[1]))
return;
if (string_to_inode_range(argv[2], argv[2], &ifrom, &ito) & 0x2) {
fprintf(stderr, "do_rstat: invalid inodes range.\n");
return;
}
inode_buf = (struct ext3_inode *)
malloc(EXT3_INODE_SIZE(current_fs->super));
if (!inode_buf) {
fprintf(stderr, "do_rstat: can't allocate buffer\n");
return;
}
for (inode = ifrom; inode<ito; inode++) {
r = debugfs_read_inode_full(inode, inode_buf, argv[1],
EXT3_INODE_SIZE(current_fs->super));
if (r) {
FILE *out;
out = open_pager();
fprintf(out, "%13ud ERROR %ld\n\n", inode, r);
close_pager(out);
} else
dump_inode(inode, inode_buf);
}
free(inode_buf);
return;
}
(However, I won't detail it here because it's quite specific to my needs, but I also replaced the dump_inode(inode, inode_buf); call to get the output on one line with fixed width fields in order to remove the need for pattern matching in the calling program). In order to do that, I inspired myself from the dump_inode and dump_inode_internal functions.
and I also needed to add two functions in debugfs/util.c
/*
* This routine is used whenever a command needs to turn an <ino> string
* into an inode.
*/
ext2_ino_t string_to_inode_number(char *str)
{
ext2_ino_t ino;
int len = strlen(str);
char *end;
if ((len<2) || (str[0] != '<') || (str[len-1] != '>')) return 0;
ino=strtoul(str+1, &end, 0);
if (*end!='>') return -1;
return ino;
}
/*
* This routine is used whenever a command needs to turn 2 <ino> strings
* into an inodes range ( [ino1, ino2[ ).
*/
int string_to_inode_range(char *str1, char *str2, ext2_ino_t *ino1, ext2_ino_t *ino2)
{
int invalid = 0;
ext2_ino_t inox;
*ino1 = string_to_inode_number(str1);
*ino2 = string_to_inode_number(str2);
if (*ino2 == -1) {
*ino2 = current_fs->super->s_inodes_count+1;
invalid |= 0x1;
}
if (*ino1 >= *ino2) {
inox = *ino1;
*ino1 = *ino2;
*ino2 = inox;
invalid |= 0x2;
}
if (*ino1 <= 0) {
*ino1 = 1;
invalid |= 0x4;
}
if (*ino2 > current_fs->super->s_inodes_count+1) {
*ino2 = current_fs->super->s_inodes_count+1;
invalid |= 0x8;
}
return invalid;
}
I needed to add their prototypes in debugfs/debugfs.h
extern ext2_ino_t string_to_inode_number(char *str);
extern int string_to_inode_range(char *str1, char *str2, ext2_ino_t *ino1, ext2_ino_t *ino2);
and i also added an entry for the new commant in debug_commands.ct:
request do_rstat, "Show inodes information ",
show_inodes_info, rstat;
and when I call it, i need to make sure the output is piped (like in | cat), in order to deactivate the annoying pager.
eg:
> debugfs -cD -R 'rstat <100> <200>' /dev/sdXXX | cat
(Don't forget that /dev/sdXXX must not be mounted)