2 * Copyright (c) 2000-2001 Christoph Hellwig.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions, and the following disclaimer,
10 * without modification.
11 * 2. The name of the author may not be used to endorse or promote products
12 * derived from this software without specific prior written permission.
14 * Alternatively, this software may be distributed under the terms of the
15 * GNU General Public License ("GPL").
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
21 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * Veritas filesystem driver - inode routines.
34 #include <linux/buffer_head.h>
35 #include <linux/pagemap.h>
36 #include <linux/kernel.h>
37 #include <linux/slab.h>
38 #include <linux/namei.h>
41 #include "vxfs_inode.h"
42 #include "vxfs_extern.h"
45 struct kmem_cache *vxfs_inode_cachep;
50 * Dump inode contents (partially).
53 vxfs_dumpi(struct vxfs_inode_info *vip, ino_t ino)
55 printk(KERN_DEBUG "\n\n");
57 printk(KERN_DEBUG "dumping vxfs inode %ld\n", ino);
59 printk(KERN_DEBUG "dumping unknown vxfs inode\n");
61 printk(KERN_DEBUG "---------------------------\n");
62 printk(KERN_DEBUG "mode is %x\n", vip->vii_mode);
63 printk(KERN_DEBUG "nlink:%u, uid:%u, gid:%u\n",
64 vip->vii_nlink, vip->vii_uid, vip->vii_gid);
65 printk(KERN_DEBUG "size:%Lx, blocks:%u\n",
66 vip->vii_size, vip->vii_blocks);
67 printk(KERN_DEBUG "orgtype:%u\n", vip->vii_orgtype);
73 * vxfs_blkiget - find inode based on extent #
74 * @sbp: superblock of the filesystem we search in
75 * @extent: number of the extent to search
76 * @ino: inode number to search
79 * vxfs_blkiget searches inode @ino in the filesystem described by
80 * @sbp in the extent @extent.
81 * Returns the matching VxFS inode on success, else a NULL pointer.
84 * While __vxfs_iget uses the pagecache vxfs_blkiget uses the
85 * buffercache. This function should not be used outside the
86 * read_super() method, otherwise the data may be incoherent.
88 struct vxfs_inode_info *
89 vxfs_blkiget(struct super_block *sbp, u_long extent, ino_t ino)
91 struct buffer_head *bp;
94 block = extent + ((ino * VXFS_ISIZE) / sbp->s_blocksize);
95 offset = ((ino % (sbp->s_blocksize / VXFS_ISIZE)) * VXFS_ISIZE);
96 bp = sb_bread(sbp, block);
98 if (bp && buffer_mapped(bp)) {
99 struct vxfs_inode_info *vip;
100 struct vxfs_dinode *dip;
102 if (!(vip = kmem_cache_alloc(vxfs_inode_cachep, GFP_KERNEL)))
104 dip = (struct vxfs_dinode *)(bp->b_data + offset);
105 memcpy(vip, dip, sizeof(*vip));
107 vxfs_dumpi(vip, ino);
114 printk(KERN_WARNING "vxfs: unable to read block %ld\n", block);
120 * __vxfs_iget - generic find inode facility
121 * @sbp: VFS superblock
123 * @ilistp: inode list
126 * Search the for inode number @ino in the filesystem
127 * described by @sbp. Use the specified inode table (@ilistp).
128 * Returns the matching VxFS inode on success, else an error code.
130 static struct vxfs_inode_info *
131 __vxfs_iget(ino_t ino, struct inode *ilistp)
136 offset = (ino % (PAGE_SIZE / VXFS_ISIZE)) * VXFS_ISIZE;
137 pp = vxfs_get_page(ilistp->i_mapping, ino * VXFS_ISIZE / PAGE_SIZE);
140 struct vxfs_inode_info *vip;
141 struct vxfs_dinode *dip;
142 caddr_t kaddr = (char *)page_address(pp);
144 if (!(vip = kmem_cache_alloc(vxfs_inode_cachep, GFP_KERNEL)))
146 dip = (struct vxfs_dinode *)(kaddr + offset);
147 memcpy(vip, dip, sizeof(*vip));
149 vxfs_dumpi(vip, ino);
155 printk(KERN_WARNING "vxfs: error on page %p\n", pp);
159 printk(KERN_WARNING "vxfs: unable to read inode %ld\n", (unsigned long)ino);
161 return ERR_PTR(-ENOMEM);
165 * vxfs_stiget - find inode using the structural inode list
166 * @sbp: VFS superblock
170 * Find inode @ino in the filesystem described by @sbp using
171 * the structural inode list.
172 * Returns the matching VxFS inode on success, else a NULL pointer.
174 struct vxfs_inode_info *
175 vxfs_stiget(struct super_block *sbp, ino_t ino)
177 struct vxfs_inode_info *vip;
179 vip = __vxfs_iget(ino, VXFS_SBI(sbp)->vsi_stilist);
180 return IS_ERR(vip) ? NULL : vip;
184 * vxfs_transmod - mode for a VxFS inode
188 * vxfs_transmod returns a Linux mode_t for a given
189 * VxFS inode structure.
191 static __inline__ umode_t
192 vxfs_transmod(struct vxfs_inode_info *vip)
194 umode_t ret = vip->vii_mode & ~VXFS_TYPE_MASK;
196 if (VXFS_ISFIFO(vip))
215 * vxfs_iinit- helper to fill inode fields
220 * vxfs_instino is a helper function to fill in all relevant
221 * fields in @ip from @vip.
224 vxfs_iinit(struct inode *ip, struct vxfs_inode_info *vip)
227 ip->i_mode = vxfs_transmod(vip);
228 i_uid_write(ip, (uid_t)vip->vii_uid);
229 i_gid_write(ip, (gid_t)vip->vii_gid);
231 set_nlink(ip, vip->vii_nlink);
232 ip->i_size = vip->vii_size;
234 ip->i_atime.tv_sec = vip->vii_atime;
235 ip->i_ctime.tv_sec = vip->vii_ctime;
236 ip->i_mtime.tv_sec = vip->vii_mtime;
237 ip->i_atime.tv_nsec = 0;
238 ip->i_ctime.tv_nsec = 0;
239 ip->i_mtime.tv_nsec = 0;
241 ip->i_blocks = vip->vii_blocks;
242 ip->i_generation = vip->vii_gen;
249 * vxfs_get_fake_inode - get fake inode structure
250 * @sbp: filesystem superblock
254 * vxfs_fake_inode gets a fake inode (not in the inode hash) for a
255 * superblock, vxfs_inode pair.
256 * Returns the filled VFS inode.
259 vxfs_get_fake_inode(struct super_block *sbp, struct vxfs_inode_info *vip)
261 struct inode *ip = NULL;
263 if ((ip = new_inode(sbp))) {
264 ip->i_ino = get_next_ino();
266 ip->i_mapping->a_ops = &vxfs_aops;
272 * vxfs_put_fake_inode - free faked inode
276 * vxfs_put_fake_inode frees all data associated with @ip.
279 vxfs_put_fake_inode(struct inode *ip)
285 * vxfs_iget - get an inode
286 * @sbp: the superblock to get the inode for
287 * @ino: the number of the inode to get
290 * vxfs_read_inode creates an inode, reads the disk inode for @ino and fills
291 * in all relevant fields in the new inode.
294 vxfs_iget(struct super_block *sbp, ino_t ino)
296 struct vxfs_inode_info *vip;
297 const struct address_space_operations *aops;
300 ip = iget_locked(sbp, ino);
302 return ERR_PTR(-ENOMEM);
303 if (!(ip->i_state & I_NEW))
306 vip = __vxfs_iget(ino, VXFS_SBI(sbp)->vsi_ilist);
309 return ERR_CAST(vip);
314 if (VXFS_ISIMMED(vip))
315 aops = &vxfs_immed_aops;
319 if (S_ISREG(ip->i_mode)) {
320 ip->i_fop = &generic_ro_fops;
321 ip->i_mapping->a_ops = aops;
322 } else if (S_ISDIR(ip->i_mode)) {
323 ip->i_op = &vxfs_dir_inode_ops;
324 ip->i_fop = &vxfs_dir_operations;
325 ip->i_mapping->a_ops = aops;
326 } else if (S_ISLNK(ip->i_mode)) {
327 if (!VXFS_ISIMMED(vip)) {
328 ip->i_op = &page_symlink_inode_operations;
330 ip->i_mapping->a_ops = &vxfs_aops;
332 ip->i_op = &simple_symlink_inode_operations;
333 ip->i_link = vip->vii_immed.vi_immed;
334 nd_terminate_link(ip->i_link, ip->i_size,
335 sizeof(vip->vii_immed.vi_immed) - 1);
338 init_special_inode(ip, ip->i_mode, old_decode_dev(vip->vii_rdev));
340 unlock_new_inode(ip);
344 static void vxfs_i_callback(struct rcu_head *head)
346 struct inode *inode = container_of(head, struct inode, i_rcu);
347 kmem_cache_free(vxfs_inode_cachep, inode->i_private);
351 * vxfs_evict_inode - remove inode from main memory
352 * @ip: inode to discard.
355 * vxfs_evict_inode() is called on the final iput and frees the private
359 vxfs_evict_inode(struct inode *ip)
361 truncate_inode_pages_final(&ip->i_data);
363 call_rcu(&ip->i_rcu, vxfs_i_callback);