Re: cramfs mounts provide corrupted content since 2.6.15

[Dave Johnson <djohnson@sw.starentnetworks.com>]

Chris Mason writes:
> On Tuesday 28 February 2006 15:40, Dave Johnson wrote:
> 
> > What version of mkcramfs are you using?  Empty regular files should
> > have offset set to 0 already.
> 
> The image is being generated by util-linux 2.12r (this is the root disk for 
> the SUSE 10.1 install).
> 
> I checked via hexdump, the offset for mtab is definitely not zero.
> 
> -chris
> 

Ah, that makes sense now.

parse_directory() is different between util-linux 2.12r and
cramfstools 1.1:

util-linux 2.12r:

                } else if (S_ISREG(st.st_mode)) {
                        entry->path = strdup(path);
                        if (entry->size) {
                                if (entry->size >= (1 << CRAMFS_SIZE_WIDTH)) {
                                        warn_size = 1;
                                        entry->size = (1 << CRAMFS_SIZE_WIDTH) - 1;
                                }
                        }


cramfstools 1.1:

                } else if (S_ISREG(st.st_mode)) {
                        if (entry->size) {
                                if (access(path, R_OK) < 0) {
                                        warn_skip = 1;
                                        continue;
                                }
                                entry->path = strdup(path);
                                if (!entry->path) {
                                        die(MKFS_ERROR, 1, "strdup failed");
                                }
                                if ((entry->size >= 1 << CRAMFS_SIZE_WIDTH)) {
                                        warn_size = 1;
                                        entry->size = (1 << CRAMFS_SIZE_WIDTH) - 1;
                                }
                        }


in cramfstools entry->path is not set for empty files causing
write_data() to keep offset set to 0.


-- 
Dave Johnson
Starent Networks