vfs: fix FIGETBSZ ioctl on an overlayfs file

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Some anon_bdev filesystems (e.g. overlayfs, ceph) don't have s_blocksize
set. Returning zero from FIGETBSZ ioctl results in a Floating point
exception from the e2fsprogs utility filefrag, which divides the size of
the file with the value returned by FIGETBSZ.

Fix the interface by returning -EINVAL for these filesystems.

Fixes: d1d04ef857 ("ovl: stack file ops")
Cc: <stable@vger.kernel.org> # v4.19
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

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Amir Goldstein 2018-10-11 17:38:14 +03:00 • committed by Miklos Szeredi

parent 1f244dc521

commit 8f97d1e991

1 changed files with 3 additions and 0 deletions

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fs/ioctl.c

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