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Mount fails if file system image has empty files because of sanity check while reading superblock. For empty files disk offset to end of file (i_eoffset) is cpu_to_le32(-1). Sanity check comparison, which compares disk offset with file system size isn't valid for this value and hence is ignored with this patch. Steps to reproduce: $ dd if=/dev/zero of=bfs-image count=204800 $ mkfs.bfs bfs-image $ mkdir bfs-mount-point $ sudo mount -t bfs -o loop bfs-image bfs-mount-point/ $ cd bfs-mount-point/ $ sudo touch a $ cd .. $ sudo umount bfs-mount-point/ $ sudo mount -t bfs -o loop bfs-image bfs-mount-point/ mount: /dev/loop0: can't read superblock $ dmesg [25526.689580] BFS-fs: bfs_fill_super(): Inode 0x00000003 corrupted Tigran said: "If you had created the filesystem with the proper mkfs under SCO UnixWare 7 you (probably) wouldn't encounter this issue. But since commercial Unix-es are now part of history and the only proper way is the Linux mkfs.bfs utility, your patch is fine" Link: http://lkml.kernel.org/r/20170505201625.GA3097@hercules.tuxera.com Signed-off-by: Rakesh Pandit <rakesh@tuxera.com> Acked-by: Tigran Aivazian <aivazian.tigran@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
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| bfs.h | ||
| dir.c | ||
| file.c | ||
| inode.c | ||
| Kconfig | ||
| Makefile | ||