[XFS] Add compat handlers for swapext ioctl

The big hitter here was the bstat field, which contains
different sized time_t on 32 vs. 64 bit.  Add a copyin
function to translate the 32-bit arg to 64-bit, and
call the swapext ioctl helper.

Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>

2 files changed, 69 insertions, 5 deletions

diff --git a/fs/xfs/linux-2.6/xfs_ioctl32.c b/fs/xfs/linux-2.6/xfs_ioctl32.c
index 35edc054fb99..132f3dd2c7e8 100644
--- a/fs/xfs/linux-2.6/xfs_ioctl32.c
+++ b/fs/xfs/linux-2.6/xfs_ioctl32.c
@@ -108,6 +108,50 @@ xfs_inumbers_fmt_compat(
 #define xfs_inumbers_fmt_compat xfs_inumbers_fmt
 #endif
 
+STATIC int
+xfs_ioctl32_bstime_copyin(
+        xfs_bstime_t            *bstime,
+        compat_xfs_bstime_t     __user *bstime32)
+{
+        compat_time_t           sec32;  /* tv_sec differs on 64 vs. 32 */
+
+        if (get_user(sec32,             &bstime32->tv_sec)      ||
+            get_user(bstime->tv_nsec,   &bstime32->tv_nsec))
+                return -XFS_ERROR(EFAULT);
+        bstime->tv_sec = sec32;
+        return 0;
+}
+
+/* xfs_bstat_t has differing alignment on intel, & bstime_t sizes everywhere */
+STATIC int
+xfs_ioctl32_bstat_copyin(
+        xfs_bstat_t             *bstat,
+        compat_xfs_bstat_t      __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,  &bstat32->bs_projid)    ||
+            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 -XFS_ERROR(EFAULT);
+        return 0;
+}
+
 /* XFS_IOC_FSBULKSTAT and friends */
 
 STATIC int
@@ -292,6 +336,18 @@ xfs_compat_ioctl(
         case XFS_IOC_GETVERSION_32:
                 cmd = _NATIVE_IOC(cmd, long);
                 break;
+        case XFS_IOC_SWAPEXT: {
+                struct xfs_swapext        sxp;
+                struct compat_xfs_swapext __user *sxu = arg;
+
+                /* Bulk copy in up to the sx_stat field, then grab bstat */
+                if (copy_from_user(&sxp, sxu,
+                                   offsetof(xfs_swapext_t, sx_stat)) ||
+                    xfs_ioctl32_bstat_copyin(&sxp.sx_stat, &sxu->sx_stat))
+                        return -XFS_ERROR(EFAULT);
+                error = xfs_swapext(&sxp);
+                return -error;
+        }
 #ifdef BROKEN_X86_ALIGNMENT
         /* xfs_flock_t has wrong u32 vs u64 alignment */
         case XFS_IOC_ALLOCSP_32:
@@ -322,11 +378,6 @@ xfs_compat_ioctl(
         case XFS_IOC_UNRESVSP64:
         case XFS_IOC_FSGEOMETRY_V1:
                 break;
-
-        /* xfs_bstat_t still has wrong u32 vs u64 alignment */
-        case XFS_IOC_SWAPEXT:
-                break;
-
 #endif
         case XFS_IOC_FSBULKSTAT_32:
         case XFS_IOC_FSBULKSTAT_SINGLE_32:
diff --git a/fs/xfs/linux-2.6/xfs_ioctl32.h b/fs/xfs/linux-2.6/xfs_ioctl32.h
index 003a10e695be..bf08ab12a6f8 100644
--- a/fs/xfs/linux-2.6/xfs_ioctl32.h
+++ b/fs/xfs/linux-2.6/xfs_ioctl32.h
@@ -110,6 +110,19 @@ typedef struct compat_xfs_fsop_handlereq {
 #define XFS_IOC_READLINK_BY_HANDLE_32 \
         _IOWR('X', 108, struct compat_xfs_fsop_handlereq)
 
+/* The bstat field in the swapext struct needs translation */
+typedef struct compat_xfs_swapext {
+        __int64_t               sx_version;     /* version */
+        __int64_t               sx_fdtarget;    /* fd of target file */
+        __int64_t               sx_fdtmp;       /* fd of tmp file */
+        xfs_off_t               sx_offset;      /* offset into file */
+        xfs_off_t               sx_length;      /* leng from offset */
+        char                    sx_pad[16];     /* pad space, unused */
+        compat_xfs_bstat_t      sx_stat;        /* stat of target b4 copy */
+} __compat_packed compat_xfs_swapext_t;
+
+#define XFS_IOC_SWAPEXT_32      _IOWR('X', 109, struct compat_xfs_swapext)
+
 #ifdef BROKEN_X86_ALIGNMENT
 /* on ia32 l_start is on a 32-bit boundary */
 typedef struct compat_xfs_flock64 {