The change to the ioctl commands requires updating the header file. If
we do that, the alignment problem on i386 could be solved for the new
format by explictly aligning all 64-bit members to time_t. This complicates
the header file definition, but saves the code to deal with a third format.
The native ioctl simply deals with both the time32 and the time64 version,
and the latter is the same across all 64-bit architectures and all 32-bit
user space with 32-bit time_t including i386 and x32.
If we decide to do this, this change should be folded into "xfs: [variant B]
add time64 version of xfs_bstat".
Signed-off-by: Arnd Bergmann <a...@arndb.de>
---
fs/xfs/libxfs/xfs_fs.h | 20 +++++--
fs/xfs/xfs_ioctl32.c | 120 +----------------------------------------
2 files changed, 18 insertions(+), 122 deletions(-)
diff --git a/fs/xfs/libxfs/xfs_fs.h b/fs/xfs/libxfs/xfs_fs.h
index 9310576a45e5..e95807d223ad 100644
--- a/fs/xfs/libxfs/xfs_fs.h
+++ b/fs/xfs/libxfs/xfs_fs.h
@@ -319,6 +319,17 @@ typedef struct xfs_growfs_rt {
__u32 extsize; /* new realtime extent size, fsblocks */
} xfs_growfs_rt_t;
+/*
+ * on i386, u64 has 32-bit alignment, which makes the traditional xfs_bstat
+ * different from other architectures. Aligning all 64-bit members to
+ * sizeof(time_t) means that the new version with 64-bit time_t is padded
+ * the same as on all other architectures.
+ */
+#ifdef __i386__
+#define __TIME_ALIGN __attribute__((aligned(sizeof(time_t))))
+#else
+#define __TIME_ALIGN
+#endif
/*
* Structures returned from ioctl XFS_IOC_FSBULKSTAT &
XFS_IOC_FSBULKSTAT_SINGLE
@@ -328,24 +339,24 @@ typedef struct xfs_bstime {
__s64 tv_sec; /* seconds */
__s32 tv_nsec; /* and nanoseconds */
#else
- time_t tv_sec; /* seconds */
+ time_t tv_sec __TIME_ALIGN; /* seconds */
__s32 tv_nsec; /* and nanoseconds */
#endif
} xfs_bstime_t;
struct xfs_bstat {
- __u64 bs_ino; /* inode number */
+ __u64 bs_ino __TIME_ALIGN; /* inode number */
__u16 bs_mode; /* type and mode */
__u16 bs_nlink; /* number of links */
__u32 bs_uid; /* user id */
__u32 bs_gid; /* group id */
__u32 bs_rdev; /* device value */
__s32 bs_blksize; /* block size */
- __s64 bs_size; /* file size */
+ __s64 bs_size __TIME_ALIGN; /* file size */
xfs_bstime_t bs_atime; /* access time */
xfs_bstime_t bs_mtime; /* modify time */
xfs_bstime_t bs_ctime; /* inode change time */
- int64_t bs_blocks; /* number of blocks */
+ int64_t bs_blocks __TIME_ALIGN; /* number of blocks */
__u32 bs_xflags; /* extended flags */
__s32 bs_extsize; /* extent size */
__s32 bs_extents; /* number of extents */
@@ -362,6 +373,7 @@ struct xfs_bstat {
__u16 bs_dmstate; /* DMIG state info */
__u16 bs_aextents; /* attribute number of extents */
};
+#undef __TIME_ALIGN
/* New bulkstat structure that reports v5 features and fixes padding issues */
struct xfs_bulkstat {
diff --git a/fs/xfs/xfs_ioctl32.c b/fs/xfs/xfs_ioctl32.c
index 2ea7d3e12b4b..8059cdc2d5ca 100644
--- a/fs/xfs/xfs_ioctl32.c
+++ b/fs/xfs/xfs_ioctl32.c
@@ -98,101 +98,6 @@ xfs_fsinumbers_fmt_compat(
return xfs_ibulk_advance(breq, sizeof(struct compat_xfs_inogrp));
}
-/* struct xfs_bstat has differing alignment on intel */
-STATIC int
-xfs_ioctl32_bstime_copyin(
- xfs_bstime_t *bstime,
- compat_xfs_bstime_t __user *bstime32)
-{
- if (get_user(bstime->tv_sec, &bstime32->tv_sec) ||
- get_user(bstime->tv_nsec, &bstime32->tv_nsec))
- return -EFAULT;
- return 0;
-}
-
-STATIC int
-xfs_ioctl32_bstat_copyin(
- struct xfs_bstat *bstat,
- struct compat_xfs_bstat __user *bstat32)
-{
- if (get_user(bstat->bs_ino, &bstat32->bs_ino) ||
- get_user(bstat->bs_mode, &bstat32->bs_mode) ||
- get_user(bstat->bs_nlink, &bstat32->bs_nlink) ||
- get_user(bstat->bs_uid, &bstat32->bs_uid) ||
- get_user(bstat->bs_gid, &bstat32->bs_gid) ||
- get_user(bstat->bs_rdev, &bstat32->bs_rdev) ||
- get_user(bstat->bs_blksize, &bstat32->bs_blksize) ||
- get_user(bstat->bs_size, &bstat32->bs_size) ||
- xfs_ioctl32_bstime_copyin(&bstat->bs_atime, &bstat32->bs_atime) ||
- xfs_ioctl32_bstime_copyin(&bstat->bs_mtime, &bstat32->bs_mtime) ||
- xfs_ioctl32_bstime_copyin(&bstat->bs_ctime, &bstat32->bs_ctime) ||
- get_user(bstat->bs_blocks, &bstat32->bs_size) ||
- get_user(bstat->bs_xflags, &bstat32->bs_size) ||
- get_user(bstat->bs_extsize, &bstat32->bs_extsize) ||
- get_user(bstat->bs_extents, &bstat32->bs_extents) ||
- get_user(bstat->bs_gen, &bstat32->bs_gen) ||
- get_user(bstat->bs_projid_lo, &bstat32->bs_projid_lo) ||
- get_user(bstat->bs_projid_hi, &bstat32->bs_projid_hi) ||
- get_user(bstat->bs_forkoff, &bstat32->bs_forkoff) ||
- get_user(bstat->bs_dmevmask, &bstat32->bs_dmevmask) ||
- get_user(bstat->bs_dmstate, &bstat32->bs_dmstate) ||
- get_user(bstat->bs_aextents, &bstat32->bs_aextents))
- return -EFAULT;
- return 0;
-}
-
-/* XFS_IOC_FSBULKSTAT and friends */
-
-STATIC int
-xfs_bstime_store_compat(
- compat_xfs_bstime_t __user *p32,
- const xfs_bstime_t *p)
-{
- if (put_user(p->tv_sec, &p32->tv_sec) ||
- put_user(p->tv_nsec, &p32->tv_nsec))
- return -EFAULT;
- return 0;
-}
-
-/* Return 0 on success or positive error (to xfs_bulkstat()) */
-STATIC int
-xfs_fsbulkstat_one_fmt_compat(
- struct xfs_ibulk *breq,
- const struct xfs_bulkstat *bstat)
-{
- struct compat_xfs_bstat __user *p32 = breq->ubuffer;
- struct xfs_bstat bs1;
- struct xfs_bstat *buffer = &bs1;
-
- xfs_bulkstat_to_bstat(breq->mp, &bs1, bstat);
-
- if (put_user(buffer->bs_ino, &p32->bs_ino) ||
- put_user(buffer->bs_mode, &p32->bs_mode) ||
- put_user(buffer->bs_nlink, &p32->bs_nlink) ||
- put_user(buffer->bs_uid, &p32->bs_uid) ||
- put_user(buffer->bs_gid, &p32->bs_gid) ||
- put_user(buffer->bs_rdev, &p32->bs_rdev) ||
- put_user(buffer->bs_blksize, &p32->bs_blksize) ||
- put_user(buffer->bs_size, &p32->bs_size) ||
- xfs_bstime_store_compat(&p32->bs_atime, &buffer->bs_atime) ||
- xfs_bstime_store_compat(&p32->bs_mtime, &buffer->bs_mtime) ||
- xfs_bstime_store_compat(&p32->bs_ctime, &buffer->bs_ctime) ||
- put_user(buffer->bs_blocks, &p32->bs_blocks) ||
- put_user(buffer->bs_xflags, &p32->bs_xflags) ||
- put_user(buffer->bs_extsize, &p32->bs_extsize) ||
- put_user(buffer->bs_extents, &p32->bs_extents) ||
- put_user(buffer->bs_gen, &p32->bs_gen) ||
- put_user(buffer->bs_projid, &p32->bs_projid) ||
- put_user(buffer->bs_projid_hi, &p32->bs_projid_hi) ||
- put_user(buffer->bs_forkoff, &p32->bs_forkoff) ||
- put_user(buffer->bs_dmevmask, &p32->bs_dmevmask) ||
- put_user(buffer->bs_dmstate, &p32->bs_dmstate) ||
- put_user(buffer->bs_aextents, &p32->bs_aextents))
- return -EFAULT;
-
- return xfs_ibulk_advance(breq, sizeof(struct compat_xfs_bstat));
-}
-
#else
#define xfs_fsinumbers_fmt_compat xfs_fsinumbers_fmt
#endif /* BROKEN_X86_ALIGNMENT */
@@ -221,11 +126,6 @@ xfs_compat_ioc_fsbulkstat(
*/
inumbers_fmt_pf inumbers_func = xfs_fsinumbers_fmt_compat;
bulkstat_one_fmt_pf bs_one_func_old = xfs_fsbulkstat_time32_one_fmt;
- bulkstat_one_fmt_pf bs_one_func_new = xfs_fsbulkstat_one_fmt;
-
-#ifdef BROKEN_X86_ALIGNMENT
- bs_one_func_new = xfs_fsbulkstat_one_fmt_compat;
-#endif
#ifdef CONFIG_X86_X32
if (in_x32_syscall()) {
@@ -305,12 +205,12 @@ xfs_compat_ioc_fsbulkstat(
case XFS_IOC_FSBULKSTAT_SINGLE_NEW32:
breq.startino = lastino;
breq.icount = 1;
- error = xfs_bulkstat_one(&breq, bs_one_func_new);
+ error = xfs_bulkstat_one(&breq, xfs_fsbulkstat_one_fmt);
lastino = breq.startino;
break;
case XFS_IOC_FSBULKSTAT_NEW32:
breq.startino = lastino ? lastino + 1 : 0;
- error = xfs_bulkstat(&breq, bs_one_func_new);
+ error = xfs_bulkstat(&breq, xfs_fsbulkstat_one_fmt);
lastino = breq.startino - 1;
break;
default:
@@ -610,22 +510,6 @@ xfs_file_compat_ioctl(
mnt_drop_write_file(filp);
return error;
}
- case XFS_IOC_SWAPEXT_32: {
- struct xfs_swapext sxp;
- struct compat_xfs_swapext __user *sxu = arg;
-
- /* Bulk copy in up to the sx_stat field, then copy bstat */
- if (copy_from_user(&sxp, sxu,
- offsetof(struct xfs_swapext, sx_stat)) ||
- xfs_ioctl32_bstat_copyin(&sxp.sx_stat, &sxu->sx_stat))
- return -EFAULT;
- error = mnt_want_write_file(filp);
- if (error)
- return error;
- error = xfs_ioc_swapext(&sxp);
- mnt_drop_write_file(filp);
- return error;
- }
#endif
/* long changes size, but xfs only copiese out 32 bits */
case XFS_IOC_GETXFLAGS_32:
--
2.20.0
_______________________________________________
Y2038 mailing list
Y2038@lists.linaro.org
https://lists.linaro.org/mailman/listinfo/y2038
