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| author | Heiko Carstens <hca@linux.ibm.com> | 2021-02-10 23:51:02 +0300 |
|---|---|---|
| committer | Vasily Gorbik <gor@linux.ibm.com> | 2021-02-13 19:17:53 +0300 |
| commit | 96c0a6a72d181a330db6dc9848ff2e6584b1aa5b (patch) | |
| tree | a07fb7a168db5b28c239c84822e818cee1655bc1 /fs/statfs.c | |
| parent | efa54735905c03bf876b4451cfaef6b45046bc53 (diff) | |
| download | linux-96c0a6a72d181a330db6dc9848ff2e6584b1aa5b.tar.xz | |
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.c | 5 |
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; } |