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authorHeiko Carstens <hca@linux.ibm.com>2021-02-10 21:51:02 +0100
committerVasily Gorbik <gor@linux.ibm.com>2021-02-13 17:17:53 +0100
commit96c0a6a72d181a330db6dc9848ff2e6584b1aa5b (patch)
treea07fb7a168db5b28c239c84822e818cee1655bc1 /fs/statfs.c
parentefa54735905c03bf876b4451cfaef6b45046bc53 (diff)
downloadlinux-96c0a6a72d181a330db6dc9848ff2e6584b1aa5b.tar.bz2
s390,alpha: switch to 64-bit ino_t
s390 and alpha are the only 64 bit architectures with a 32-bit ino_t. Since this is quite unusual this causes bugs from time to time. See e.g. commit ebce3eb2f7ef ("ceph: fix inode number handling on arches with 32-bit ino_t") for an example. This (obviously) also prevents s390 and alpha to use 64-bit ino_t for tmpfs. See commit b85a7a8bb573 ("tmpfs: disallow CONFIG_TMPFS_INODE64 on s390"). Therefore switch both s390 and alpha to 64-bit ino_t. This should only have an effect on the ustat system call. To prevent ABI breakage define struct ustat compatible to the old layout and change sys_ustat() accordingly. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'fs/statfs.c')
-rw-r--r--fs/statfs.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/fs/statfs.c b/fs/statfs.c
index 68cb07788750..0ba34c135593 100644
--- a/fs/statfs.c
+++ b/fs/statfs.c
@@ -255,7 +255,10 @@ SYSCALL_DEFINE2(ustat, unsigned, dev, struct ustat __user *, ubuf)
memset(&tmp,0,sizeof(struct ustat));
tmp.f_tfree = sbuf.f_bfree;
- tmp.f_tinode = sbuf.f_ffree;
+ if (IS_ENABLED(CONFIG_ARCH_32BIT_USTAT_F_TINODE))
+ tmp.f_tinode = min_t(u64, sbuf.f_ffree, UINT_MAX);
+ else
+ tmp.f_tinode = sbuf.f_ffree;
return copy_to_user(ubuf, &tmp, sizeof(struct ustat)) ? -EFAULT : 0;
}