summaryrefslogtreecommitdiffstats
path: root/fs/freevxfs/vxfs_olt.c
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /fs/freevxfs/vxfs_olt.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'fs/freevxfs/vxfs_olt.c')
-rw-r--r--fs/freevxfs/vxfs_olt.c105
1 files changed, 105 insertions, 0 deletions
diff --git a/fs/freevxfs/vxfs_olt.c b/fs/freevxfs/vxfs_olt.c
new file mode 100644
index 0000000000..23f35187c2
--- /dev/null
+++ b/fs/freevxfs/vxfs_olt.c
@@ -0,0 +1,105 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2000-2001 Christoph Hellwig.
+ */
+
+/*
+ * Veritas filesystem driver - object location table support.
+ */
+#include <linux/fs.h>
+#include <linux/buffer_head.h>
+#include <linux/kernel.h>
+
+#include "vxfs.h"
+#include "vxfs_olt.h"
+#include "vxfs_extern.h"
+
+
+static inline void
+vxfs_get_fshead(struct vxfs_oltfshead *fshp, struct vxfs_sb_info *infp)
+{
+ BUG_ON(infp->vsi_fshino);
+ infp->vsi_fshino = fs32_to_cpu(infp, fshp->olt_fsino[0]);
+}
+
+static inline void
+vxfs_get_ilist(struct vxfs_oltilist *ilistp, struct vxfs_sb_info *infp)
+{
+ BUG_ON(infp->vsi_iext);
+ infp->vsi_iext = fs32_to_cpu(infp, ilistp->olt_iext[0]);
+}
+
+static inline u_long
+vxfs_oblock(struct super_block *sbp, daddr_t block, u_long bsize)
+{
+ BUG_ON(sbp->s_blocksize % bsize);
+ return (block * (sbp->s_blocksize / bsize));
+}
+
+
+/**
+ * vxfs_read_olt - read olt
+ * @sbp: superblock of the filesystem
+ * @bsize: blocksize of the filesystem
+ *
+ * Description:
+ * vxfs_read_olt reads the olt of the filesystem described by @sbp
+ * into main memory and does some basic setup.
+ *
+ * Returns:
+ * Zero on success, else a negative error code.
+ */
+int
+vxfs_read_olt(struct super_block *sbp, u_long bsize)
+{
+ struct vxfs_sb_info *infp = VXFS_SBI(sbp);
+ struct buffer_head *bp;
+ struct vxfs_olt *op;
+ char *oaddr, *eaddr;
+
+ bp = sb_bread(sbp, vxfs_oblock(sbp, infp->vsi_oltext, bsize));
+ if (!bp || !bp->b_data)
+ goto fail;
+
+ op = (struct vxfs_olt *)bp->b_data;
+ if (fs32_to_cpu(infp, op->olt_magic) != VXFS_OLT_MAGIC) {
+ printk(KERN_NOTICE "vxfs: ivalid olt magic number\n");
+ goto fail;
+ }
+
+ /*
+ * It is in theory possible that vsi_oltsize is > 1.
+ * I've not seen any such filesystem yet and I'm lazy.. --hch
+ */
+ if (infp->vsi_oltsize > 1) {
+ printk(KERN_NOTICE "vxfs: oltsize > 1 detected.\n");
+ printk(KERN_NOTICE "vxfs: please notify hch@infradead.org\n");
+ goto fail;
+ }
+
+ oaddr = bp->b_data + fs32_to_cpu(infp, op->olt_size);
+ eaddr = bp->b_data + (infp->vsi_oltsize * sbp->s_blocksize);
+
+ while (oaddr < eaddr) {
+ struct vxfs_oltcommon *ocp =
+ (struct vxfs_oltcommon *)oaddr;
+
+ switch (fs32_to_cpu(infp, ocp->olt_type)) {
+ case VXFS_OLT_FSHEAD:
+ vxfs_get_fshead((struct vxfs_oltfshead *)oaddr, infp);
+ break;
+ case VXFS_OLT_ILIST:
+ vxfs_get_ilist((struct vxfs_oltilist *)oaddr, infp);
+ break;
+ }
+
+ oaddr += fs32_to_cpu(infp, ocp->olt_size);
+ }
+
+ brelse(bp);
+ return (infp->vsi_fshino && infp->vsi_iext) ? 0 : -EINVAL;
+
+fail:
+ brelse(bp);
+ return -EINVAL;
+}