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
vxfs_dumpi(struct vxfs_inode_info * vip,ino_t ino)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
vxfs_transmod(struct vxfs_inode_info * vip)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
dip2vip_cpy(struct vxfs_sb_info * sbi,struct vxfs_inode_info * vip,struct vxfs_dinode * dip)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->i_atime.tv_sec = vip->vii_atime;
113 inode_set_ctime(inode, vip->vii_ctime, 0);
114 inode->i_mtime.tv_sec = vip->vii_mtime;
115 inode->i_atime.tv_nsec = 0;
116 inode->i_mtime.tv_nsec = 0;
117
118 inode->i_blocks = vip->vii_blocks;
119 inode->i_generation = vip->vii_gen;
120 }
121
122 /**
123 * vxfs_blkiget - find inode based on extent #
124 * @sbp: superblock of the filesystem we search in
125 * @extent: number of the extent to search
126 * @ino: inode number to search
127 *
128 * Description:
129 * vxfs_blkiget searches inode @ino in the filesystem described by
130 * @sbp in the extent @extent.
131 * Returns the matching VxFS inode on success, else a NULL pointer.
132 *
133 * NOTE:
134 * While __vxfs_iget uses the pagecache vxfs_blkiget uses the
135 * buffercache. This function should not be used outside the
136 * read_super() method, otherwise the data may be incoherent.
137 */
138 struct inode *
vxfs_blkiget(struct super_block * sbp,u_long extent,ino_t ino)139 vxfs_blkiget(struct super_block *sbp, u_long extent, ino_t ino)
140 {
141 struct buffer_head *bp;
142 struct inode *inode;
143 u_long block, offset;
144
145 inode = new_inode(sbp);
146 if (!inode)
147 return NULL;
148 inode->i_ino = get_next_ino();
149
150 block = extent + ((ino * VXFS_ISIZE) / sbp->s_blocksize);
151 offset = ((ino % (sbp->s_blocksize / VXFS_ISIZE)) * VXFS_ISIZE);
152 bp = sb_bread(sbp, block);
153
154 if (bp && buffer_mapped(bp)) {
155 struct vxfs_inode_info *vip = VXFS_INO(inode);
156 struct vxfs_dinode *dip;
157
158 dip = (struct vxfs_dinode *)(bp->b_data + offset);
159 dip2vip_cpy(VXFS_SBI(sbp), vip, dip);
160 vip->vfs_inode.i_mapping->a_ops = &vxfs_aops;
161 #ifdef DIAGNOSTIC
162 vxfs_dumpi(vip, ino);
163 #endif
164 brelse(bp);
165 return inode;
166 }
167
168 printk(KERN_WARNING "vxfs: unable to read block %ld\n", block);
169 brelse(bp);
170 iput(inode);
171 return NULL;
172 }
173
174 /**
175 * __vxfs_iget - generic find inode facility
176 * @ilistp: inode list
177 * @vip: VxFS inode to fill in
178 * @ino: inode number
179 *
180 * Description:
181 * Search the for inode number @ino in the filesystem
182 * described by @sbp. Use the specified inode table (@ilistp).
183 * Returns the matching inode on success, else an error code.
184 */
185 static int
__vxfs_iget(struct inode * ilistp,struct vxfs_inode_info * vip,ino_t ino)186 __vxfs_iget(struct inode *ilistp, struct vxfs_inode_info *vip, ino_t ino)
187 {
188 struct page *pp;
189 u_long offset;
190
191 offset = (ino % (PAGE_SIZE / VXFS_ISIZE)) * VXFS_ISIZE;
192 pp = vxfs_get_page(ilistp->i_mapping, ino * VXFS_ISIZE / PAGE_SIZE);
193
194 if (!IS_ERR(pp)) {
195 struct vxfs_dinode *dip;
196 caddr_t kaddr = (char *)page_address(pp);
197
198 dip = (struct vxfs_dinode *)(kaddr + offset);
199 dip2vip_cpy(VXFS_SBI(ilistp->i_sb), vip, dip);
200 vip->vfs_inode.i_mapping->a_ops = &vxfs_aops;
201 #ifdef DIAGNOSTIC
202 vxfs_dumpi(vip, ino);
203 #endif
204 vxfs_put_page(pp);
205 return 0;
206 }
207
208 printk(KERN_WARNING "vxfs: error on page 0x%p for inode %ld\n",
209 pp, (unsigned long)ino);
210 return PTR_ERR(pp);
211 }
212
213 /**
214 * vxfs_stiget - find inode using the structural inode list
215 * @sbp: VFS superblock
216 * @ino: inode #
217 *
218 * Description:
219 * Find inode @ino in the filesystem described by @sbp using
220 * the structural inode list.
221 * Returns the matching inode on success, else a NULL pointer.
222 */
223 struct inode *
vxfs_stiget(struct super_block * sbp,ino_t ino)224 vxfs_stiget(struct super_block *sbp, ino_t ino)
225 {
226 struct inode *inode;
227 int error;
228
229 inode = new_inode(sbp);
230 if (!inode)
231 return NULL;
232 inode->i_ino = get_next_ino();
233
234 error = __vxfs_iget(VXFS_SBI(sbp)->vsi_stilist, VXFS_INO(inode), ino);
235 if (error) {
236 iput(inode);
237 return NULL;
238 }
239
240 return inode;
241 }
242
243 /**
244 * vxfs_iget - get an inode
245 * @sbp: the superblock to get the inode for
246 * @ino: the number of the inode to get
247 *
248 * Description:
249 * vxfs_read_inode creates an inode, reads the disk inode for @ino and fills
250 * in all relevant fields in the new inode.
251 */
252 struct inode *
vxfs_iget(struct super_block * sbp,ino_t ino)253 vxfs_iget(struct super_block *sbp, ino_t ino)
254 {
255 struct vxfs_inode_info *vip;
256 const struct address_space_operations *aops;
257 struct inode *ip;
258 int error;
259
260 ip = iget_locked(sbp, ino);
261 if (!ip)
262 return ERR_PTR(-ENOMEM);
263 if (!(ip->i_state & I_NEW))
264 return ip;
265
266 vip = VXFS_INO(ip);
267 error = __vxfs_iget(VXFS_SBI(sbp)->vsi_ilist, vip, ino);
268 if (error) {
269 iget_failed(ip);
270 return ERR_PTR(error);
271 }
272
273 if (VXFS_ISIMMED(vip))
274 aops = &vxfs_immed_aops;
275 else
276 aops = &vxfs_aops;
277
278 if (S_ISREG(ip->i_mode)) {
279 ip->i_fop = &generic_ro_fops;
280 ip->i_mapping->a_ops = aops;
281 } else if (S_ISDIR(ip->i_mode)) {
282 ip->i_op = &vxfs_dir_inode_ops;
283 ip->i_fop = &vxfs_dir_operations;
284 ip->i_mapping->a_ops = aops;
285 } else if (S_ISLNK(ip->i_mode)) {
286 if (!VXFS_ISIMMED(vip)) {
287 ip->i_op = &page_symlink_inode_operations;
288 inode_nohighmem(ip);
289 ip->i_mapping->a_ops = &vxfs_aops;
290 } else {
291 ip->i_op = &simple_symlink_inode_operations;
292 ip->i_link = vip->vii_immed.vi_immed;
293 nd_terminate_link(ip->i_link, ip->i_size,
294 sizeof(vip->vii_immed.vi_immed) - 1);
295 }
296 } else
297 init_special_inode(ip, ip->i_mode, old_decode_dev(vip->vii_rdev));
298
299 unlock_new_inode(ip);
300 return ip;
301 }
302
303 /**
304 * vxfs_evict_inode - remove inode from main memory
305 * @ip: inode to discard.
306 *
307 * Description:
308 * vxfs_evict_inode() is called on the final iput and frees the private
309 * inode area.
310 */
311 void
vxfs_evict_inode(struct inode * ip)312 vxfs_evict_inode(struct inode *ip)
313 {
314 truncate_inode_pages_final(&ip->i_data);
315 clear_inode(ip);
316 }
317