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authorKrzysztof Błaszkowski <kb@sysmikro.com.pl>2016-05-31 08:45:13 +0200
committerChristoph Hellwig <hch@lst.de>2016-06-01 09:01:28 +0200
commit0d83f7fc83f77d1cc8395b9e851325d8cc1892e3 (patch)
tree9cfc6aef0a098884097fd37bb413639e8e76f461 /fs/freevxfs/vxfs_super.c
parent6b15d6650c5301ce023d8df0cc3a60b1a76d377e (diff)
freevxfs: handle big endian HP-UX file systems
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>
Diffstat (limited to 'fs/freevxfs/vxfs_super.c')
-rw-r--r--fs/freevxfs/vxfs_super.c101
1 files changed, 73 insertions, 28 deletions
diff --git a/fs/freevxfs/vxfs_super.c b/fs/freevxfs/vxfs_super.c
index 7ca8c75d50d3..6124091b4fdb 100644
--- a/fs/freevxfs/vxfs_super.c
+++ b/fs/freevxfs/vxfs_super.c
@@ -109,14 +109,15 @@ static int
vxfs_statfs(struct dentry *dentry, struct kstatfs *bufp)
{
struct vxfs_sb_info *infp = VXFS_SBI(dentry->d_sb);
+ struct vxfs_sb *raw_sb = infp->vsi_raw;
bufp->f_type = VXFS_SUPER_MAGIC;
bufp->f_bsize = dentry->d_sb->s_blocksize;
- bufp->f_blocks = infp->vsi_raw->vs_dsize;
- bufp->f_bfree = infp->vsi_raw->vs_free;
+ bufp->f_blocks = fs32_to_cpu(infp, raw_sb->vs_dsize);
+ bufp->f_bfree = fs32_to_cpu(infp, raw_sb->vs_free);
bufp->f_bavail = 0;
bufp->f_files = 0;
- bufp->f_ffree = infp->vsi_raw->vs_ifree;
+ bufp->f_ffree = fs32_to_cpu(infp, raw_sb->vs_ifree);
bufp->f_namelen = VXFS_NAMELEN;
return 0;
@@ -129,6 +130,50 @@ static int vxfs_remount(struct super_block *sb, int *flags, char *data)
return 0;
}
+
+static int vxfs_try_sb_magic(struct super_block *sbp, int silent,
+ unsigned blk, __fs32 magic)
+{
+ struct buffer_head *bp;
+ struct vxfs_sb *rsbp;
+ struct vxfs_sb_info *infp = VXFS_SBI(sbp);
+ int rc = -ENOMEM;
+
+ bp = sb_bread(sbp, blk);
+ do {
+ if (!bp || !buffer_mapped(bp)) {
+ if (!silent) {
+ printk(KERN_WARNING
+ "vxfs: unable to read disk superblock at %u\n",
+ blk);
+ }
+ break;
+ }
+
+ rc = -EINVAL;
+ rsbp = (struct vxfs_sb *)bp->b_data;
+ if (rsbp->vs_magic != magic) {
+ if (!silent)
+ printk(KERN_NOTICE
+ "vxfs: WRONG superblock magic %08x at %u\n",
+ rsbp->vs_magic, blk);
+ break;
+ }
+
+ rc = 0;
+ infp->vsi_raw = rsbp;
+ infp->vsi_bp = bp;
+ } while (0);
+
+ if (rc) {
+ infp->vsi_raw = NULL;
+ infp->vsi_bp = NULL;
+ brelse(bp);
+ }
+
+ return rc;
+}
+
/**
* vxfs_read_super - read superblock into memory and initialize filesystem
* @sbp: VFS superblock (to fill)
@@ -149,10 +194,10 @@ static int vxfs_fill_super(struct super_block *sbp, void *dp, int silent)
{
struct vxfs_sb_info *infp;
struct vxfs_sb *rsbp;
- struct buffer_head *bp = NULL;
u_long bsize;
struct inode *root;
int ret = -EINVAL;
+ u32 j;
sbp->s_flags |= MS_RDONLY;
@@ -168,42 +213,42 @@ static int vxfs_fill_super(struct super_block *sbp, void *dp, int silent)
goto out;
}
- bp = sb_bread(sbp, 1);
- if (!bp || !buffer_mapped(bp)) {
- if (!silent) {
- printk(KERN_WARNING
- "vxfs: unable to read disk superblock\n");
- }
- goto out;
- }
+ sbp->s_fs_info = infp;
- rsbp = (struct vxfs_sb *)bp->b_data;
- if (rsbp->vs_magic != VXFS_SUPER_MAGIC) {
+ if (!vxfs_try_sb_magic(sbp, silent, 1,
+ (__force __fs32)cpu_to_le32(VXFS_SUPER_MAGIC))) {
+ /* Unixware, x86 */
+ infp->byte_order = VXFS_BO_LE;
+ } else if (!vxfs_try_sb_magic(sbp, silent, 8,
+ (__force __fs32)cpu_to_be32(VXFS_SUPER_MAGIC))) {
+ /* HP-UX, parisc */
+ infp->byte_order = VXFS_BO_BE;
+ } else {
if (!silent)
- printk(KERN_NOTICE "vxfs: WRONG superblock magic\n");
+ printk(KERN_NOTICE "vxfs: can't find superblock.\n");
goto out;
}
- if ((rsbp->vs_version < 2 || rsbp->vs_version > 4) && !silent) {
- printk(KERN_NOTICE "vxfs: unsupported VxFS version (%d)\n",
- rsbp->vs_version);
+ rsbp = infp->vsi_raw;
+ j = fs32_to_cpu(infp, rsbp->vs_version);
+ if ((j < 2 || j > 4) && !silent) {
+ printk(KERN_NOTICE "vxfs: unsupported VxFS version (%d)\n", j);
goto out;
}
#ifdef DIAGNOSTIC
- printk(KERN_DEBUG "vxfs: supported VxFS version (%d)\n", rsbp->vs_version);
- printk(KERN_DEBUG "vxfs: blocksize: %d\n", rsbp->vs_bsize);
+ printk(KERN_DEBUG "vxfs: supported VxFS version (%d)\n", j);
+ printk(KERN_DEBUG "vxfs: blocksize: %d\n",
+ fs32_to_cpu(infp, rsbp->vs_bsize));
#endif
- sbp->s_magic = rsbp->vs_magic;
- sbp->s_fs_info = infp;
+ sbp->s_magic = fs32_to_cpu(infp, rsbp->vs_magic);
- infp->vsi_raw = rsbp;
- infp->vsi_bp = bp;
- infp->vsi_oltext = rsbp->vs_oltext[0];
- infp->vsi_oltsize = rsbp->vs_oltsize;
+ infp->vsi_oltext = fs32_to_cpu(infp, rsbp->vs_oltext[0]);
+ infp->vsi_oltsize = fs32_to_cpu(infp, rsbp->vs_oltsize);
- if (!sb_set_blocksize(sbp, rsbp->vs_bsize)) {
+ j = fs32_to_cpu(infp, rsbp->vs_bsize);
+ if (!sb_set_blocksize(sbp, j)) {
printk(KERN_WARNING "vxfs: unable to set final block size\n");
goto out;
}
@@ -237,7 +282,7 @@ out_free_ilist:
vxfs_put_fake_inode(infp->vsi_ilist);
vxfs_put_fake_inode(infp->vsi_stilist);
out:
- brelse(bp);
+ brelse(infp->vsi_bp);
kfree(infp);
return ret;
}