xfs: kill xfs_dir2_inou_t

And use an array of unsigned char values directly to avoid problems
with architectures that pad the size of structures.  This also gets
rid of the xfs_dir2_ino4_t and xfs_dir2_ino8_t types, and introduces
new constants for the size of 4 and 8 bytes as well as the size
difference between the two.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

diff --git a/fs/xfs/libxfs/xfs_da_format.c b/fs/xfs/libxfs/xfs_da_format.c
index 9d624a6..f1e8d4d 100644 (file)
--- a/fs/xfs/libxfs/xfs_da_format.c
+++ b/fs/xfs/libxfs/xfs_da_format.c
@@ -40,8 +40,7 @@ xfs_dir2_sf_entsize(
        int count = sizeof(struct xfs_dir2_sf_entry);   /* namelen + offset */
 
        count += len;                                   /* name */
-       count += hdr->i8count ? sizeof(xfs_dir2_ino8_t) :
-                               sizeof(xfs_dir2_ino4_t); /* ino # */
+       count += hdr->i8count ? XFS_INO64_SIZE : XFS_INO32_SIZE; /* ino # */
        return count;
 }
 
@@ -125,33 +124,33 @@ xfs_dir3_sfe_put_ftype(
 static xfs_ino_t
 xfs_dir2_sf_get_ino(
        struct xfs_dir2_sf_hdr  *hdr,
-       xfs_dir2_inou_t         *from)
+       __uint8_t               *from)
 {
        if (hdr->i8count)
-               return get_unaligned_be64(&from->i8.i) & 0x00ffffffffffffffULL;
+               return get_unaligned_be64(from) & 0x00ffffffffffffffULL;
        else
-               return get_unaligned_be32(&from->i4.i);
+               return get_unaligned_be32(from);
 }
 
 static void
 xfs_dir2_sf_put_ino(
        struct xfs_dir2_sf_hdr  *hdr,
-       xfs_dir2_inou_t         *to,
+       __uint8_t               *to,
        xfs_ino_t               ino)
 {
        ASSERT((ino & 0xff00000000000000ULL) == 0);
 
        if (hdr->i8count)
-               put_unaligned_be64(ino, &to->i8.i);
+               put_unaligned_be64(ino, to);
        else
-               put_unaligned_be32(ino, &to->i4.i);
+               put_unaligned_be32(ino, to);
 }
 
 static xfs_ino_t
 xfs_dir2_sf_get_parent_ino(
        struct xfs_dir2_sf_hdr  *hdr)
 {
-       return xfs_dir2_sf_get_ino(hdr, &hdr->parent);
+       return xfs_dir2_sf_get_ino(hdr, hdr->parent);
 }
 
 static void
@@ -159,7 +158,7 @@ xfs_dir2_sf_put_parent_ino(
        struct xfs_dir2_sf_hdr  *hdr,
        xfs_ino_t               ino)
 {
-       xfs_dir2_sf_put_ino(hdr, &hdr->parent, ino);
+       xfs_dir2_sf_put_ino(hdr, hdr->parent, ino);
 }
 
 /*
@@ -173,8 +172,7 @@ xfs_dir2_sfe_get_ino(
        struct xfs_dir2_sf_hdr  *hdr,
        struct xfs_dir2_sf_entry *sfep)
 {
-       return xfs_dir2_sf_get_ino(hdr,
-                               (xfs_dir2_inou_t *)&sfep->name[sfep->namelen]);
+       return xfs_dir2_sf_get_ino(hdr, &sfep->name[sfep->namelen]);
 }
 
 static void
@@ -183,8 +181,7 @@ xfs_dir2_sfe_put_ino(
        struct xfs_dir2_sf_entry *sfep,
        xfs_ino_t               ino)
 {
-       xfs_dir2_sf_put_ino(hdr,
-                           (xfs_dir2_inou_t *)&sfep->name[sfep->namelen], ino);
+       xfs_dir2_sf_put_ino(hdr, &sfep->name[sfep->namelen], ino);
 }
 
 static xfs_ino_t
@@ -192,8 +189,7 @@ xfs_dir3_sfe_get_ino(
        struct xfs_dir2_sf_hdr  *hdr,
        struct xfs_dir2_sf_entry *sfep)
 {
-       return xfs_dir2_sf_get_ino(hdr,
-                       (xfs_dir2_inou_t *)&sfep->name[sfep->namelen + 1]);
+       return xfs_dir2_sf_get_ino(hdr, &sfep->name[sfep->namelen + 1]);
 }
 
 static void
@@ -202,8 +198,7 @@ xfs_dir3_sfe_put_ino(
        struct xfs_dir2_sf_entry *sfep,
        xfs_ino_t               ino)
 {
-       xfs_dir2_sf_put_ino(hdr,
-                       (xfs_dir2_inou_t *)&sfep->name[sfep->namelen + 1], ino);
+       xfs_dir2_sf_put_ino(hdr, &sfep->name[sfep->namelen + 1], ino);
 }
 
 

diff --git a/fs/xfs/libxfs/xfs_da_format.h b/fs/xfs/libxfs/xfs_da_format.h
index a5f4d6e..f877bb1 100644 (file)
--- a/fs/xfs/libxfs/xfs_da_format.h
+++ b/fs/xfs/libxfs/xfs_da_format.h
@@ -208,22 +208,10 @@ typedef   xfs_off_t       xfs_dir2_off_t;
  */
 typedef        __uint32_t      xfs_dir2_db_t;
 
-/*
- * Inode number stored as 8 8-bit values.
- */
-typedef        struct { __uint8_t i[8]; } xfs_dir2_ino8_t;
-
-/*
- * Inode number stored as 4 8-bit values.
- * Works a lot of the time, when all the inode numbers in a directory
- * fit in 32 bits.
- */
-typedef struct { __uint8_t i[4]; } xfs_dir2_ino4_t;
+#define XFS_INO32_SIZE 4
+#define XFS_INO64_SIZE 8
+#define XFS_INO64_DIFF (XFS_INO64_SIZE - XFS_INO32_SIZE)
 
-typedef union {
-       xfs_dir2_ino8_t i8;
-       xfs_dir2_ino4_t i4;
-} xfs_dir2_inou_t;
 #define        XFS_DIR2_MAX_SHORT_INUM ((xfs_ino_t)0xffffffffULL)
 
 /*
@@ -240,7 +228,7 @@ typedef union {
 typedef struct xfs_dir2_sf_hdr {
        __uint8_t               count;          /* count of entries */
        __uint8_t               i8count;        /* count of 8-byte inode #s */
-       xfs_dir2_inou_t         parent;         /* parent dir inode number */
+       __uint8_t               parent[8];      /* parent dir inode number */
 } __arch_pack xfs_dir2_sf_hdr_t;
 
 typedef struct xfs_dir2_sf_entry {
@@ -251,16 +239,15 @@ typedef struct xfs_dir2_sf_entry {
         * A single byte containing the file type field follows the inode
         * number for version 3 directory entries.
         *
-        * A xfs_dir2_ino8_t or xfs_dir2_ino4_t follows here, at a
-        * variable offset after the name.
+        * A 64-bit or 32-bit inode number follows here, at a variable offset
+        * after the name.
         */
 } xfs_dir2_sf_entry_t;
 
 static inline int xfs_dir2_sf_hdr_size(int i8count)
 {
        return sizeof(struct xfs_dir2_sf_hdr) -
-               (i8count == 0) *
-               (sizeof(xfs_dir2_ino8_t) - sizeof(xfs_dir2_ino4_t));
+               (i8count == 0) * XFS_INO64_DIFF;
 }
 
 static inline xfs_dir2_data_aoff_t

diff --git a/fs/xfs/libxfs/xfs_dir2_sf.c b/fs/xfs/libxfs/xfs_dir2_sf.c
index f8ccfd5..c6809ff 100644 (file)
--- a/fs/xfs/libxfs/xfs_dir2_sf.c
+++ b/fs/xfs/libxfs/xfs_dir2_sf.c
@@ -130,8 +130,8 @@ xfs_dir2_block_sfsize(
                       count * 3 * sizeof(u8) +         /* namelen + offset */
                       namelen +                        /* name */
                       (i8count ?                       /* inumber */
-                               (uint)sizeof(xfs_dir2_ino8_t) * count :
-                               (uint)sizeof(xfs_dir2_ino4_t) * count);
+                               count * XFS_INO64_SIZE :
+                               count * XFS_INO32_SIZE);
                if (size > XFS_IFORK_DSIZE(dp))
                        return size;            /* size value is a failure */
        }
@@ -318,10 +318,7 @@ xfs_dir2_sf_addname(
                /*
                 * Yes, adjust the inode size.  old count + (parent + new)
                 */
-               incr_isize +=
-                       (sfp->count + 2) *
-                       ((uint)sizeof(xfs_dir2_ino8_t) -
-                        (uint)sizeof(xfs_dir2_ino4_t));
+               incr_isize += (sfp->count + 2) * XFS_INO64_DIFF;
                objchange = 1;
        }
 
@@ -896,11 +893,7 @@ xfs_dir2_sf_replace(
                int     error;                  /* error return value */
                int     newsize;                /* new inode size */
 
-               newsize =
-                       dp->i_df.if_bytes +
-                       (sfp->count + 1) *
-                       ((uint)sizeof(xfs_dir2_ino8_t) -
-                        (uint)sizeof(xfs_dir2_ino4_t));
+               newsize = dp->i_df.if_bytes + (sfp->count + 1) * XFS_INO64_DIFF;
                /*
                 * Won't fit as shortform, convert to block then do replace.
                 */
@@ -1021,10 +1014,7 @@ xfs_dir2_sf_toino4(
        /*
         * Compute the new inode size.
         */
-       newsize =
-               oldsize -
-               (oldsfp->count + 1) *
-               ((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t));
+       newsize = oldsize - (oldsfp->count + 1) * XFS_INO64_DIFF;
        xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
        xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
        /*
@@ -1097,10 +1087,7 @@ xfs_dir2_sf_toino8(
        /*
         * Compute the new inode size (nb: entry count + 1 for parent)
         */
-       newsize =
-               oldsize +
-               (oldsfp->count + 1) *
-               ((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t));
+       newsize = oldsize + (oldsfp->count + 1) * XFS_INO64_DIFF;
        xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
        xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
        /*

diff --git a/fs/xfs/xfs_ondisk.h b/fs/xfs/xfs_ondisk.h
index 918f13c..19cc8b8 100644 (file)
--- a/fs/xfs/xfs_ondisk.h
+++ b/fs/xfs/xfs_ondisk.h
@@ -86,9 +86,6 @@ xfs_check_ondisk_structs(void)
        XFS_CHECK_STRUCT_SIZE(xfs_dir2_data_unused_t,           6);
        XFS_CHECK_STRUCT_SIZE(xfs_dir2_free_hdr_t,              16);
        XFS_CHECK_STRUCT_SIZE(xfs_dir2_free_t,                  16);
-       XFS_CHECK_STRUCT_SIZE(xfs_dir2_ino4_t,                  4);
-       XFS_CHECK_STRUCT_SIZE(xfs_dir2_ino8_t,                  8);
-       XFS_CHECK_STRUCT_SIZE(xfs_dir2_inou_t,                  8);
        XFS_CHECK_STRUCT_SIZE(xfs_dir2_leaf_entry_t,            8);
        XFS_CHECK_STRUCT_SIZE(xfs_dir2_leaf_hdr_t,              16);
        XFS_CHECK_STRUCT_SIZE(xfs_dir2_leaf_t,                  16);