diff options
| author | Brian Behlendorf <[email protected]> | 2018-09-24 17:11:25 -0700 |
|---|---|---|
| committer | GitHub <[email protected]> | 2018-09-24 17:11:25 -0700 |
| commit | e897a23eb13bafcf9c38d2fc37ae57a7729d9a02 (patch) | |
| tree | c0370c4ecee2e54a40a5e4a273bee72ecdca8220 /config | |
| parent | 36e369ecb847570d6939073663c4e95406223c7f (diff) | |
Fix statfs(2) for 32-bit user space
When handling a 32-bit statfs() system call the returned fields,
although 64-bit in the kernel, must be limited to 32-bits or an
EOVERFLOW error will be returned.
This is less of an issue for block counts since the default
reported block size in 128KiB. But since it is possible to
set a smaller block size, these values will be scaled as
needed to fit in a 32-bit unsigned long.
Unlike most other filesystems the total possible file counts
are more likely to overflow because they are calculated based
on the available free space in the pool. In order to prevent
this the reported value must be capped at 2^32-1. This is
only for statfs(2) reporting, there are no changes to the
internal ZFS limits.
Reviewed-by: Andreas Dilger <[email protected]>
Reviewed-by: Richard Yao <[email protected]>
Signed-off-by: Brian Behlendorf <[email protected]>
Issue #7927
Closes #7122
Closes #7937
Diffstat (limited to 'config')
| -rw-r--r-- | config/kernel-in-compat-syscall.m4 | 20 | ||||
| -rw-r--r-- | config/kernel.m4 | 1 |
2 files changed, 21 insertions, 0 deletions
diff --git a/config/kernel-in-compat-syscall.m4 b/config/kernel-in-compat-syscall.m4 new file mode 100644 index 000000000..9fca9da20 --- /dev/null +++ b/config/kernel-in-compat-syscall.m4 @@ -0,0 +1,20 @@ +dnl # +dnl # 4.5 API change +dnl # Added in_compat_syscall() which can be overridden on a per- +dnl # architecture basis. Prior to this is_compat_task() was the +dnl # provided interface. +dnl # +AC_DEFUN([ZFS_AC_KERNEL_IN_COMPAT_SYSCALL], [ + AC_MSG_CHECKING([whether in_compat_syscall() is available]) + ZFS_LINUX_TRY_COMPILE([ + #include <linux/compat.h> + ],[ + in_compat_syscall(); + ],[ + AC_MSG_RESULT(yes) + AC_DEFINE(HAVE_IN_COMPAT_SYSCALL, 1, + [in_compat_syscall() is available]) + ],[ + AC_MSG_RESULT(no) + ]) +]) diff --git a/config/kernel.m4 b/config/kernel.m4 index 7b92c4744..118f1d8dc 100644 --- a/config/kernel.m4 +++ b/config/kernel.m4 @@ -160,6 +160,7 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [ ZFS_AC_KERNEL_GLOBAL_PAGE_STATE ZFS_AC_KERNEL_ACL_HAS_REFCOUNT ZFS_AC_KERNEL_USERNS_CAPABILITIES + ZFS_AC_KERNEL_IN_COMPAT_SYSCALL AS_IF([test "$LINUX_OBJ" != "$LINUX"], [ KERNEL_MAKE="$KERNEL_MAKE O=$LINUX_OBJ" |