1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2000-2001 Christoph Hellwig.
4 * Copyright (c) 2016 Krzysztof Blaszkowski
8 * Veritas filesystem driver - superblock related routines.
10 #include <linux/init.h>
11 #include <linux/module.h>
13 #include <linux/blkdev.h>
15 #include <linux/buffer_head.h>
16 #include <linux/kernel.h>
17 #include <linux/slab.h>
18 #include <linux/stat.h>
19 #include <linux/vfs.h>
20 #include <linux/mount.h>
23 #include "vxfs_extern.h"
25 #include "vxfs_inode.h"
28 MODULE_AUTHOR("Christoph Hellwig, Krzysztof Blaszkowski");
29 MODULE_DESCRIPTION("Veritas Filesystem (VxFS) driver");
30 MODULE_LICENSE("Dual BSD/GPL");
32 static struct kmem_cache *vxfs_inode_cachep;
35 * vxfs_put_super - free superblock resources
36 * @sbp: VFS superblock.
39 * vxfs_put_super frees all resources allocated for @sbp
40 * after the last instance of the filesystem is unmounted.
44 vxfs_put_super(struct super_block *sbp)
46 struct vxfs_sb_info *infp = VXFS_SBI(sbp);
48 iput(infp->vsi_fship);
49 iput(infp->vsi_ilist);
50 iput(infp->vsi_stilist);
57 * vxfs_statfs - get filesystem information
58 * @dentry: VFS dentry to locate superblock
59 * @bufp: output buffer
62 * vxfs_statfs fills the statfs buffer @bufp with information
63 * about the filesystem described by @dentry.
72 * This is everything but complete...
75 vxfs_statfs(struct dentry *dentry, struct kstatfs *bufp)
77 struct vxfs_sb_info *infp = VXFS_SBI(dentry->d_sb);
78 struct vxfs_sb *raw_sb = infp->vsi_raw;
79 u64 id = huge_encode_dev(dentry->d_sb->s_bdev->bd_dev);
81 bufp->f_type = VXFS_SUPER_MAGIC;
82 bufp->f_bsize = dentry->d_sb->s_blocksize;
83 bufp->f_blocks = fs32_to_cpu(infp, raw_sb->vs_dsize);
84 bufp->f_bfree = fs32_to_cpu(infp, raw_sb->vs_free);
87 bufp->f_ffree = fs32_to_cpu(infp, raw_sb->vs_ifree);
88 bufp->f_fsid = u64_to_fsid(id);
89 bufp->f_namelen = VXFS_NAMELEN;
94 static int vxfs_remount(struct super_block *sb, int *flags, char *data)
101 static struct inode *vxfs_alloc_inode(struct super_block *sb)
103 struct vxfs_inode_info *vi;
105 vi = alloc_inode_sb(sb, vxfs_inode_cachep, GFP_KERNEL);
108 inode_init_once(&vi->vfs_inode);
109 return &vi->vfs_inode;
112 static void vxfs_free_inode(struct inode *inode)
114 kmem_cache_free(vxfs_inode_cachep, VXFS_INO(inode));
117 static const struct super_operations vxfs_super_ops = {
118 .alloc_inode = vxfs_alloc_inode,
119 .free_inode = vxfs_free_inode,
120 .evict_inode = vxfs_evict_inode,
121 .put_super = vxfs_put_super,
122 .statfs = vxfs_statfs,
123 .remount_fs = vxfs_remount,
126 static int vxfs_try_sb_magic(struct super_block *sbp, int silent,
127 unsigned blk, __fs32 magic)
129 struct buffer_head *bp;
130 struct vxfs_sb *rsbp;
131 struct vxfs_sb_info *infp = VXFS_SBI(sbp);
134 bp = sb_bread(sbp, blk);
136 if (!bp || !buffer_mapped(bp)) {
139 "vxfs: unable to read disk superblock at %u\n",
146 rsbp = (struct vxfs_sb *)bp->b_data;
147 if (rsbp->vs_magic != magic) {
150 "vxfs: WRONG superblock magic %08x at %u\n",
151 rsbp->vs_magic, blk);
156 infp->vsi_raw = rsbp;
161 infp->vsi_raw = NULL;
170 * vxfs_fill_super - read superblock into memory and initialize filesystem
171 * @sbp: VFS superblock (to fill)
172 * @dp: fs private mount data
173 * @silent: do not complain loudly when sth is wrong
176 * We are called on the first mount of a filesystem to read the
177 * superblock into memory and do some basic setup.
180 * The superblock on success, else %NULL.
183 * We are under @sbp->s_lock.
185 static int vxfs_fill_super(struct super_block *sbp, void *dp, int silent)
187 struct vxfs_sb_info *infp;
188 struct vxfs_sb *rsbp;
194 sbp->s_flags |= SB_RDONLY;
196 infp = kzalloc(sizeof(*infp), GFP_KERNEL);
198 printk(KERN_WARNING "vxfs: unable to allocate incore superblock\n");
202 bsize = sb_min_blocksize(sbp, BLOCK_SIZE);
204 printk(KERN_WARNING "vxfs: unable to set blocksize\n");
208 sbp->s_op = &vxfs_super_ops;
209 sbp->s_fs_info = infp;
211 sbp->s_time_max = U32_MAX;
213 if (!vxfs_try_sb_magic(sbp, silent, 1,
214 (__force __fs32)cpu_to_le32(VXFS_SUPER_MAGIC))) {
216 infp->byte_order = VXFS_BO_LE;
217 } else if (!vxfs_try_sb_magic(sbp, silent, 8,
218 (__force __fs32)cpu_to_be32(VXFS_SUPER_MAGIC))) {
220 infp->byte_order = VXFS_BO_BE;
223 printk(KERN_NOTICE "vxfs: can't find superblock.\n");
227 rsbp = infp->vsi_raw;
228 j = fs32_to_cpu(infp, rsbp->vs_version);
229 if ((j < 2 || j > 4) && !silent) {
230 printk(KERN_NOTICE "vxfs: unsupported VxFS version (%d)\n", j);
235 printk(KERN_DEBUG "vxfs: supported VxFS version (%d)\n", j);
236 printk(KERN_DEBUG "vxfs: blocksize: %d\n",
237 fs32_to_cpu(infp, rsbp->vs_bsize));
240 sbp->s_magic = fs32_to_cpu(infp, rsbp->vs_magic);
242 infp->vsi_oltext = fs32_to_cpu(infp, rsbp->vs_oltext[0]);
243 infp->vsi_oltsize = fs32_to_cpu(infp, rsbp->vs_oltsize);
245 j = fs32_to_cpu(infp, rsbp->vs_bsize);
246 if (!sb_set_blocksize(sbp, j)) {
247 printk(KERN_WARNING "vxfs: unable to set final block size\n");
251 if (vxfs_read_olt(sbp, bsize)) {
252 printk(KERN_WARNING "vxfs: unable to read olt\n");
256 if (vxfs_read_fshead(sbp)) {
257 printk(KERN_WARNING "vxfs: unable to read fshead\n");
261 root = vxfs_iget(sbp, VXFS_ROOT_INO);
266 sbp->s_root = d_make_root(root);
268 printk(KERN_WARNING "vxfs: unable to get root dentry.\n");
275 iput(infp->vsi_fship);
276 iput(infp->vsi_ilist);
277 iput(infp->vsi_stilist);
279 brelse(infp->vsi_bp);
285 * The usual module blurb.
287 static struct dentry *vxfs_mount(struct file_system_type *fs_type,
288 int flags, const char *dev_name, void *data)
290 return mount_bdev(fs_type, flags, dev_name, data, vxfs_fill_super);
293 static struct file_system_type vxfs_fs_type = {
294 .owner = THIS_MODULE,
297 .kill_sb = kill_block_super,
298 .fs_flags = FS_REQUIRES_DEV,
300 MODULE_ALIAS_FS("vxfs"); /* makes mount -t vxfs autoload the module */
301 MODULE_ALIAS("vxfs");
308 vxfs_inode_cachep = kmem_cache_create_usercopy("vxfs_inode",
309 sizeof(struct vxfs_inode_info), 0,
310 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
311 offsetof(struct vxfs_inode_info, vii_immed.vi_immed),
312 sizeof_field(struct vxfs_inode_info,
315 if (!vxfs_inode_cachep)
317 rv = register_filesystem(&vxfs_fs_type);
319 kmem_cache_destroy(vxfs_inode_cachep);
326 unregister_filesystem(&vxfs_fs_type);
328 * Make sure all delayed rcu free inodes are flushed before we
332 kmem_cache_destroy(vxfs_inode_cachep);
335 module_init(vxfs_init);
336 module_exit(vxfs_cleanup);