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| author | Neil Armstrong <narmstrong@neotion.com> | 2011-11-02 13:37:47 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-11-02 16:06:58 -0700 |
| commit | f919b9235f930e649b374a50009c6c268bd9a073 (patch) | |
| tree | e6e58d209b82add156f53649a78b34f8cdc08222 /init | |
| parent | 0620d9193cb976ba635d56a6cfd11cb81616d02b (diff) | |
| download | lwn-f919b9235f930e649b374a50009c6c268bd9a073.tar.gz lwn-f919b9235f930e649b374a50009c6c268bd9a073.zip | |
init/do_mounts_rd.c: fix ramdisk identification for padded cramfs
When a cramfs ramdisk padded with 512 bytes is given to the kernel, the
current identify_ramdisk_image function fails to identify it.
Tested with a padded cramfs image on an ARM based board.
Signed-off-by: Neil Armstrong <narmstrong@neotion.com>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Davidlohr Bueso <dave@gnu.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'init')
| -rw-r--r-- | init/do_mounts_rd.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/init/do_mounts_rd.c b/init/do_mounts_rd.c index fe9acb0ae480..887629e24c54 100644 --- a/init/do_mounts_rd.c +++ b/init/do_mounts_rd.c @@ -120,6 +120,20 @@ identify_ramdisk_image(int fd, int start_block, decompress_fn *decompressor) } /* + * Read 512 bytes further to check if cramfs is padded + */ + sys_lseek(fd, start_block * BLOCK_SIZE + 0x200, 0); + sys_read(fd, buf, size); + + if (cramfsb->magic == CRAMFS_MAGIC) { + printk(KERN_NOTICE + "RAMDISK: cramfs filesystem found at block %d\n", + start_block); + nblocks = (cramfsb->size + BLOCK_SIZE - 1) >> BLOCK_SIZE_BITS; + goto done; + } + + /* * Read block 1 to test for minix and ext2 superblock */ sys_lseek(fd, (start_block+1) * BLOCK_SIZE, 0); |