1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2000-2001 Christoph Hellwig.
4 * Copyright (c) 2016 Krzysztof Blaszkowski
5 */
6
7 /*
8 * Veritas filesystem driver - inode routines.
9 */
10 #include <linux/fs.h>
11 #include <linux/buffer_head.h>
12 #include <linux/pagemap.h>
13 #include <linux/kernel.h>
14 #include <linux/slab.h>
15 #include <linux/namei.h>
16
17 #include "vxfs.h"
18 #include "vxfs_inode.h"
19 #include "vxfs_extern.h"
20
21
22 #ifdef DIAGNOSTIC
23 /*
24 * Dump inode contents (partially).
25 */
26 void
27 vxfs_dumpi(struct vxfs_inode_info *vip, ino_t ino)
28 {
29 printk(KERN_DEBUG "\n\n");
30 if (ino)
31 printk(KERN_DEBUG "dumping vxfs inode %ld\n", ino);
32 else
33 printk(KERN_DEBUG "dumping unknown vxfs inode\n");
34
35 printk(KERN_DEBUG "---------------------------\n");
36 printk(KERN_DEBUG "mode is %x\n", vip->vii_mode);
37 printk(KERN_DEBUG "nlink:%u, uid:%u, gid:%u\n",
38 vip->vii_nlink, vip->vii_uid, vip->vii_gid);
39 printk(KERN_DEBUG "size:%Lx, blocks:%u\n",
40 vip->vii_size, vip->vii_blocks);
41 printk(KERN_DEBUG "orgtype:%u\n", vip->vii_orgtype);
42 }
43 #endif
44
45 /**
46 * vxfs_transmod - mode for a VxFS inode
47 * @vip: VxFS inode
48 *
49 * Description:
50 * vxfs_transmod returns a Linux mode_t for a given
51 * VxFS inode structure.
52 */
53 static __inline__ umode_t
54 vxfs_transmod(struct vxfs_inode_info *vip)
55 {
56 umode_t ret = vip->vii_mode & ~VXFS_TYPE_MASK;
57
58 if (VXFS_ISFIFO(vip))
59 ret |= S_IFIFO;
60 if (VXFS_ISCHR(vip))
61 ret |= S_IFCHR;
62 if (VXFS_ISDIR(vip))
63 ret |= S_IFDIR;
64 if (VXFS_ISBLK(vip))
65 ret |= S_IFBLK;
66 if (VXFS_ISLNK(vip))
67 ret |= S_IFLNK;
68 if (VXFS_ISREG(vip))
69 ret |= S_IFREG;
70 if (VXFS_ISSOC(vip))
71 ret |= S_IFSOCK;
72
73 return (ret);
74 }
75
76 static inline void dip2vip_cpy(struct vxfs_sb_info *sbi,
77 struct vxfs_inode_info *vip, struct vxfs_dinode *dip)
78 {
79 struct inode *inode = &vip->vfs_inode;
80
81 vip->vii_mode = fs32_to_cpu(sbi, dip->vdi_mode);
82 vip->vii_nlink = fs32_to_cpu(sbi, dip->vdi_nlink);
83 vip->vii_uid = fs32_to_cpu(sbi, dip->vdi_uid);
84 vip->vii_gid = fs32_to_cpu(sbi, dip->vdi_gid);
85 vip->vii_size = fs64_to_cpu(sbi, dip->vdi_size);
86 vip->vii_atime = fs32_to_cpu(sbi, dip->vdi_atime);
87 vip->vii_autime = fs32_to_cpu(sbi, dip->vdi_autime);
88 vip->vii_mtime = fs32_to_cpu(sbi, dip->vdi_mtime);
89 vip->vii_mutime = fs32_to_cpu(sbi, dip->vdi_mutime);
90 vip->vii_ctime = fs32_to_cpu(sbi, dip->vdi_ctime);
91 vip->vii_cutime = fs32_to_cpu(sbi, dip->vdi_cutime);
92 vip->vii_orgtype = dip->vdi_orgtype;
93
94 vip->vii_blocks = fs32_to_cpu(sbi, dip->vdi_blocks);
95 vip->vii_gen = fs32_to_cpu(sbi, dip->vdi_gen);
96
97 if (VXFS_ISDIR(vip))
98 vip->vii_dotdot = fs32_to_cpu(sbi, dip->vdi_dotdot);
99 else if (!VXFS_ISREG(vip) && !VXFS_ISLNK(vip))
100 vip->vii_rdev = fs32_to_cpu(sbi, dip->vdi_rdev);
101
102 /* don't endian swap the fields that differ by orgtype */
103 memcpy(&vip->vii_org, &dip->vdi_org, sizeof(vip->vii_org));
104
105 inode->i_mode = vxfs_transmod(vip);
106 i_uid_write(inode, (uid_t)vip->vii_uid);
107 i_gid_write(inode, (gid_t)vip->vii_gid);
108
109 set_nlink(inode, vip->vii_nlink);
110 inode->i_size = vip->vii_size;
111
112 inode_set_atime(inode, vip->vii_atime, 0);
113 inode_set_ctime(inode, vip->vii_ctime, 0);
114 inode_set_mtime(inode, vip->vii_mtime, 0);
115
116 inode->i_blocks = vip->vii_blocks;
117 inode->i_generation = vip->vii_gen;
118 }
119
120 /**
121 * vxfs_blkiget - find inode based on extent #
122 * @sbp: superblock of the filesystem we search in
123 * @extent: number of the extent to search
124 * @ino: inode number to search
125 *
126 * Description:
127 * vxfs_blkiget searches inode @ino in the filesystem described by
128 * @sbp in the extent @extent.
129 * Returns the matching VxFS inode on success, else a NULL pointer.
130 *
131 * NOTE:
132 * While __vxfs_iget uses the pagecache vxfs_blkiget uses the
133 * buffercache. This function should not be used outside the
134 * read_super() method, otherwise the data may be incoherent.
135 */
136 struct inode *
137 vxfs_blkiget(struct super_block *sbp, u_long extent, ino_t ino)
138 {
139 struct buffer_head *bp;
140 struct inode *inode;
141 u_long block, offset;
142
143 inode = new_inode(sbp);
144 if (!inode)
145 return NULL;
146 inode->i_ino = get_next_ino();
147
148 block = extent + ((ino * VXFS_ISIZE) / sbp->s_blocksize);
149 offset = ((ino % (sbp->s_blocksize / VXFS_ISIZE)) * VXFS_ISIZE);
150 bp = sb_bread(sbp, block);
151
152 if (bp && buffer_mapped(bp)) {
153 struct vxfs_inode_info *vip = VXFS_INO(inode);
154 struct vxfs_dinode *dip;
155
156 dip = (struct vxfs_dinode *)(bp->b_data + offset);
157 dip2vip_cpy(VXFS_SBI(sbp), vip, dip);
158 vip->vfs_inode.i_mapping->a_ops = &vxfs_aops;
159 #ifdef DIAGNOSTIC
160 vxfs_dumpi(vip, ino);
161 #endif
162 brelse(bp);
163 return inode;
164 }
165
166 printk(KERN_WARNING "vxfs: unable to read block %ld\n", block);
167 brelse(bp);
168 iput(inode);
169 return NULL;
170 }
171
172 /**
173 * __vxfs_iget - generic find inode facility
174 * @ilistp: inode list
175 * @vip: VxFS inode to fill in
176 * @ino: inode number
177 *
178 * Description:
179 * Search the for inode number @ino in the filesystem
180 * described by @sbp. Use the specified inode table (@ilistp).
181 * Returns the matching inode on success, else an error code.
182 */
183 static int
184 __vxfs_iget(struct inode *ilistp, struct vxfs_inode_info *vip, ino_t ino)
185 {
186 struct page *pp;
187 u_long offset;
188
189 offset = (ino % (PAGE_SIZE / VXFS_ISIZE)) * VXFS_ISIZE;
190 pp = vxfs_get_page(ilistp->i_mapping, ino * VXFS_ISIZE / PAGE_SIZE);
191
192 if (!IS_ERR(pp)) {
193 struct vxfs_dinode *dip;
194 caddr_t kaddr = (char *)page_address(pp);
195
196 dip = (struct vxfs_dinode *)(kaddr + offset);
197 dip2vip_cpy(VXFS_SBI(ilistp->i_sb), vip, dip);
198 vip->vfs_inode.i_mapping->a_ops = &vxfs_aops;
199 #ifdef DIAGNOSTIC
200 vxfs_dumpi(vip, ino);
201 #endif
202 vxfs_put_page(pp);
203 return 0;
204 }
205
206 printk(KERN_WARNING "vxfs: error on page 0x%p for inode %ld\n",
207 pp, (unsigned long)ino);
208 return PTR_ERR(pp);
209 }
210
211 /**
212 * vxfs_stiget - find inode using the structural inode list
213 * @sbp: VFS superblock
214 * @ino: inode #
215 *
216 * Description:
217 * Find inode @ino in the filesystem described by @sbp using
218 * the structural inode list.
219 * Returns the matching inode on success, else a NULL pointer.
220 */
221 struct inode *
222 vxfs_stiget(struct super_block *sbp, ino_t ino)
223 {
224 struct inode *inode;
225 int error;
226
227 inode = new_inode(sbp);
228 if (!inode)
229 return NULL;
230 inode->i_ino = get_next_ino();
231
232 error = __vxfs_iget(VXFS_SBI(sbp)->vsi_stilist, VXFS_INO(inode), ino);
233 if (error) {
234 iput(inode);
235 return NULL;
236 }
237
238 return inode;
239 }
240
241 /**
242 * vxfs_iget - get an inode
243 * @sbp: the superblock to get the inode for
244 * @ino: the number of the inode to get
245 *
246 * Description:
247 * vxfs_read_inode creates an inode, reads the disk inode for @ino and fills
248 * in all relevant fields in the new inode.
249 */
250 struct inode *
251 vxfs_iget(struct super_block *sbp, ino_t ino)
252 {
253 struct vxfs_inode_info *vip;
254 const struct address_space_operations *aops;
255 struct inode *ip;
256 int error;
257
258 ip = iget_locked(sbp, ino);
259 if (!ip)
260 return ERR_PTR(-ENOMEM);
261 if (!(ip->i_state & I_NEW))
262 return ip;
263
264 vip = VXFS_INO(ip);
265 error = __vxfs_iget(VXFS_SBI(sbp)->vsi_ilist, vip, ino);
266 if (error) {
267 iget_failed(ip);
268 return ERR_PTR(error);
269 }
270
271 if (VXFS_ISIMMED(vip))
272 aops = &vxfs_immed_aops;
273 else
274 aops = &vxfs_aops;
275
276 if (S_ISREG(ip->i_mode)) {
277 ip->i_fop = &generic_ro_fops;
278 ip->i_mapping->a_ops = aops;
279 } else if (S_ISDIR(ip->i_mode)) {
280 ip->i_op = &vxfs_dir_inode_ops;
281 ip->i_fop = &vxfs_dir_operations;
282 ip->i_mapping->a_ops = aops;
283 } else if (S_ISLNK(ip->i_mode)) {
284 if (!VXFS_ISIMMED(vip)) {
285 ip->i_op = &page_symlink_inode_operations;
286 inode_nohighmem(ip);
287 ip->i_mapping->a_ops = &vxfs_aops;
288 } else {
289 ip->i_op = &simple_symlink_inode_operations;
290 ip->i_link = vip->vii_immed.vi_immed;
291 nd_terminate_link(ip->i_link, ip->i_size,
292 sizeof(vip->vii_immed.vi_immed) - 1);
293 }
294 } else
295 init_special_inode(ip, ip->i_mode, old_decode_dev(vip->vii_rdev));
296
297 unlock_new_inode(ip);
298 return ip;
299 }
300
301 /**
302 * vxfs_evict_inode - remove inode from main memory
303 * @ip: inode to discard.
304 *
305 * Description:
306 * vxfs_evict_inode() is called on the final iput and frees the private
307 * inode area.
308 */
309 void
310 vxfs_evict_inode(struct inode *ip)
311 {
312 truncate_inode_pages_final(&ip->i_data);
313 clear_inode(ip);
314 }
315
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.