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freevxfs: handle big endian HP-UX file systems

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To support VxFS filesystems from HP-UX on x86 systems we need to
implement byte swapping, and to keep support for Unixware filesystems
it needs to be the complicated dual-endian kind ala sysvfs.

To do this properly we have to split the on disk and in-core inode
so that we can keep the in-core one in native endianness.  All other
structures are byteswapped on demand.

Signed-off-by: Krzysztof Błaszkowski <kb@sysmikro.com.pl>
[hch: make spare happy]
Signed-off-by: Christoph Hellwig <hch@lst.de>
这个提交包含在：
Krzysztof Błaszkowski
2016-05-31 08:45:13 +02:00
提交者 Christoph Hellwig
父节点 6b15d6650c
当前提交 0d83f7fc83
共修改 11 个文件，包含 405 行新增和 277 行删除
下载 Patch 文件 下载 Diff 文件 展开所有文件 折叠所有文件

70
fs/freevxfs/vxfs_bmap.c
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@@ -68,8 +68,9 @@ vxfs_bmap_ext4(struct inode *ip, long bn)
{
struct super_block *sb = ip->i_sb;
struct vxfs_inode_info *vip = VXFS_INO(ip);
struct vxfs_sb_info *sbi = VXFS_SBI(sb);
unsigned long bsize = sb->s_blocksize;
u32 indsize = vip->vii_ext4.ve4_indsize;
u32 indsize = fs32_to_cpu(sbi, vip->vii_ext4.ve4_indsize);
int i;
if (indsize > sb->s_blocksize)
@@ -77,22 +78,24 @@ vxfs_bmap_ext4(struct inode *ip, long bn)
for (i = 0; i < VXFS_NDADDR; i++) {
struct direct *d = vip->vii_ext4.ve4_direct + i;
if (bn >= 0 && bn < d->size)
return (bn + d->extent);
bn -= d->size;
if (bn >= 0 && bn < fs32_to_cpu(sbi, d->size))
return (bn + fs32_to_cpu(sbi, d->extent));
bn -= fs32_to_cpu(sbi, d->size);
}
if ((bn / (indsize * indsize * bsize / 4)) == 0) {
struct buffer_head *buf;
daddr_t bno;
u32 *indir;
__fs32 *indir;
buf = sb_bread(sb, vip->vii_ext4.ve4_indir[0]);
buf = sb_bread(sb,
fs32_to_cpu(sbi, vip->vii_ext4.ve4_indir[0]));
if (!buf || !buffer_mapped(buf))
goto fail_buf;
indir = (u32 *)buf->b_data;
bno = indir[(bn/indsize) % (indsize*bn)] + (bn%indsize);
indir = (__fs32 *)buf->b_data;
bno = fs32_to_cpu(sbi, indir[(bn / indsize) % (indsize * bn)]) +
(bn % indsize);
brelse(buf);
return bno;
@@ -127,6 +130,7 @@ fail_buf:
static daddr_t
vxfs_bmap_indir(struct inode *ip, long indir, int size, long block)
{
struct vxfs_sb_info *sbi = VXFS_SBI(ip->i_sb);
struct buffer_head *bp = NULL;
daddr_t pblock = 0;
int i;
@@ -142,24 +146,27 @@ vxfs_bmap_indir(struct inode *ip, long indir, int size, long block)
typ = ((struct vxfs_typed *)bp->b_data) +
(i % VXFS_TYPED_PER_BLOCK(ip->i_sb));
off = (typ->vt_hdr & VXFS_TYPED_OFFSETMASK);
off = fs64_to_cpu(sbi, typ->vt_hdr) & VXFS_TYPED_OFFSETMASK;
if (block < off) {
brelse(bp);
continue;
}
switch ((u_int32_t)(typ->vt_hdr >> VXFS_TYPED_TYPESHIFT)) {
switch ((u_int32_t)(fs64_to_cpu(sbi, typ->vt_hdr) >>
VXFS_TYPED_TYPESHIFT)) {
case VXFS_TYPED_INDIRECT:
pblock = vxfs_bmap_indir(ip, typ->vt_block,
typ->vt_size, block - off);
pblock = vxfs_bmap_indir(ip,
fs32_to_cpu(sbi, typ->vt_block),
fs32_to_cpu(sbi, typ->vt_size),
block - off);
if (pblock == -2)
break;
goto out;
case VXFS_TYPED_DATA:
if ((block - off) >= typ->vt_size)
if ((block - off) >= fs32_to_cpu(sbi, typ->vt_size))
break;
pblock = (typ->vt_block + block - off);
pblock = fs32_to_cpu(sbi, typ->vt_block) + block - off;
goto out;
case VXFS_TYPED_INDIRECT_DEV4:
case VXFS_TYPED_DATA_DEV4: {
@@ -167,13 +174,15 @@ vxfs_bmap_indir(struct inode *ip, long indir, int size, long block)
(struct vxfs_typed_dev4 *)typ;
printk(KERN_INFO "\n\nTYPED_DEV4 detected!\n");
printk(KERN_INFO "block: %Lu\tsize: %Ld\tdev: %d\n",
(unsigned long long) typ4->vd4_block,
(unsigned long long) typ4->vd4_size,
typ4->vd4_dev);
printk(KERN_INFO "block: %llu\tsize: %lld\tdev: %d\n",
fs64_to_cpu(sbi, typ4->vd4_block),
fs64_to_cpu(sbi, typ4->vd4_size),
fs32_to_cpu(sbi, typ4->vd4_dev));
goto fail;
}
default:
printk(KERN_ERR "%s:%d vt_hdr %llu\n", __func__,
__LINE__, fs64_to_cpu(sbi, typ->vt_hdr));
BUG();
}
brelse(bp);
@@ -201,28 +210,33 @@ static daddr_t
vxfs_bmap_typed(struct inode *ip, long iblock)
{
struct vxfs_inode_info *vip = VXFS_INO(ip);
struct vxfs_sb_info *sbi = VXFS_SBI(ip->i_sb);
daddr_t pblock = 0;
int i;
for (i = 0; i < VXFS_NTYPED; i++) {
struct vxfs_typed *typ = vip->vii_org.typed + i;
int64_t off = (typ->vt_hdr & VXFS_TYPED_OFFSETMASK);
u64 hdr = fs64_to_cpu(sbi, typ->vt_hdr);
int64_t off = (hdr & VXFS_TYPED_OFFSETMASK);
#ifdef DIAGNOSTIC
vxfs_typdump(typ);
#endif
if (iblock < off)
continue;
switch ((u_int32_t)(typ->vt_hdr >> VXFS_TYPED_TYPESHIFT)) {
switch ((u32)(hdr >> VXFS_TYPED_TYPESHIFT)) {
case VXFS_TYPED_INDIRECT:
pblock = vxfs_bmap_indir(ip, typ->vt_block,
typ->vt_size, iblock - off);
pblock = vxfs_bmap_indir(ip,
fs32_to_cpu(sbi, typ->vt_block),
fs32_to_cpu(sbi, typ->vt_size),
iblock - off);
if (pblock == -2)
break;
return (pblock);
case VXFS_TYPED_DATA:
if ((iblock - off) < typ->vt_size)
return (typ->vt_block + iblock - off);
if ((iblock - off) < fs32_to_cpu(sbi, typ->vt_size))
return (fs32_to_cpu(sbi, typ->vt_block) +
iblock - off);
break;
case VXFS_TYPED_INDIRECT_DEV4:
case VXFS_TYPED_DATA_DEV4: {
@@ -230,10 +244,10 @@ vxfs_bmap_typed(struct inode *ip, long iblock)
(struct vxfs_typed_dev4 *)typ;
printk(KERN_INFO "\n\nTYPED_DEV4 detected!\n");
printk(KERN_INFO "block: %Lu\tsize: %Ld\tdev: %d\n",
(unsigned long long) typ4->vd4_block,
(unsigned long long) typ4->vd4_size,
typ4->vd4_dev);
printk(KERN_INFO "block: %llu\tsize: %lld\tdev: %d\n",
fs64_to_cpu(sbi, typ4->vd4_block),
fs64_to_cpu(sbi, typ4->vd4_size),
fs32_to_cpu(sbi, typ4->vd4_dev));
return 0;
}
default: