1 /*
2  * Copyright (c) 2000-2001 Christoph Hellwig.
3  * Copyright (c) 2016 Krzysztof Blaszkowski
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions, and the following disclaimer,
11  *    without modification.
12  * 2. The name of the author may not be used to endorse or promote products
13  *    derived from this software without specific prior written permission.
14  *
15  * Alternatively, this software may be distributed under the terms of the
16  * GNU General Public License ("GPL").
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
22  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28  * SUCH DAMAGE.
29  */
30 
31 /*
32  * Veritas filesystem driver - inode routines.
33  */
34 #include <linux/fs.h>
35 #include <linux/buffer_head.h>
36 #include <linux/pagemap.h>
37 #include <linux/kernel.h>
38 #include <linux/slab.h>
39 #include <linux/namei.h>
40 
41 #include "vxfs.h"
42 #include "vxfs_inode.h"
43 #include "vxfs_extern.h"
44 
45 
46 #ifdef DIAGNOSTIC
47 /*
48  * Dump inode contents (partially).
49  */
50 void
vxfs_dumpi(struct vxfs_inode_info * vip,ino_t ino)51 vxfs_dumpi(struct vxfs_inode_info *vip, ino_t ino)
52 {
53 	printk(KERN_DEBUG "\n\n");
54 	if (ino)
55 		printk(KERN_DEBUG "dumping vxfs inode %ld\n", ino);
56 	else
57 		printk(KERN_DEBUG "dumping unknown vxfs inode\n");
58 
59 	printk(KERN_DEBUG "---------------------------\n");
60 	printk(KERN_DEBUG "mode is %x\n", vip->vii_mode);
61 	printk(KERN_DEBUG "nlink:%u, uid:%u, gid:%u\n",
62 			vip->vii_nlink, vip->vii_uid, vip->vii_gid);
63 	printk(KERN_DEBUG "size:%Lx, blocks:%u\n",
64 			vip->vii_size, vip->vii_blocks);
65 	printk(KERN_DEBUG "orgtype:%u\n", vip->vii_orgtype);
66 }
67 #endif
68 
69 /**
70  * vxfs_transmod - mode for a VxFS inode
71  * @vip:	VxFS inode
72  *
73  * Description:
74  *  vxfs_transmod returns a Linux mode_t for a given
75  *  VxFS inode structure.
76  */
77 static __inline__ umode_t
vxfs_transmod(struct vxfs_inode_info * vip)78 vxfs_transmod(struct vxfs_inode_info *vip)
79 {
80 	umode_t			ret = vip->vii_mode & ~VXFS_TYPE_MASK;
81 
82 	if (VXFS_ISFIFO(vip))
83 		ret |= S_IFIFO;
84 	if (VXFS_ISCHR(vip))
85 		ret |= S_IFCHR;
86 	if (VXFS_ISDIR(vip))
87 		ret |= S_IFDIR;
88 	if (VXFS_ISBLK(vip))
89 		ret |= S_IFBLK;
90 	if (VXFS_ISLNK(vip))
91 		ret |= S_IFLNK;
92 	if (VXFS_ISREG(vip))
93 		ret |= S_IFREG;
94 	if (VXFS_ISSOC(vip))
95 		ret |= S_IFSOCK;
96 
97 	return (ret);
98 }
99 
dip2vip_cpy(struct vxfs_sb_info * sbi,struct vxfs_inode_info * vip,struct vxfs_dinode * dip)100 static inline void dip2vip_cpy(struct vxfs_sb_info *sbi,
101 		struct vxfs_inode_info *vip, struct vxfs_dinode *dip)
102 {
103 	struct inode *inode = &vip->vfs_inode;
104 
105 	vip->vii_mode = fs32_to_cpu(sbi, dip->vdi_mode);
106 	vip->vii_nlink = fs32_to_cpu(sbi, dip->vdi_nlink);
107 	vip->vii_uid = fs32_to_cpu(sbi, dip->vdi_uid);
108 	vip->vii_gid = fs32_to_cpu(sbi, dip->vdi_gid);
109 	vip->vii_size = fs64_to_cpu(sbi, dip->vdi_size);
110 	vip->vii_atime = fs32_to_cpu(sbi, dip->vdi_atime);
111 	vip->vii_autime = fs32_to_cpu(sbi, dip->vdi_autime);
112 	vip->vii_mtime = fs32_to_cpu(sbi, dip->vdi_mtime);
113 	vip->vii_mutime = fs32_to_cpu(sbi, dip->vdi_mutime);
114 	vip->vii_ctime = fs32_to_cpu(sbi, dip->vdi_ctime);
115 	vip->vii_cutime = fs32_to_cpu(sbi, dip->vdi_cutime);
116 	vip->vii_orgtype = dip->vdi_orgtype;
117 
118 	vip->vii_blocks = fs32_to_cpu(sbi, dip->vdi_blocks);
119 	vip->vii_gen = fs32_to_cpu(sbi, dip->vdi_gen);
120 
121 	if (VXFS_ISDIR(vip))
122 		vip->vii_dotdot = fs32_to_cpu(sbi, dip->vdi_dotdot);
123 	else if (!VXFS_ISREG(vip) && !VXFS_ISLNK(vip))
124 		vip->vii_rdev = fs32_to_cpu(sbi, dip->vdi_rdev);
125 
126 	/* don't endian swap the fields that differ by orgtype */
127 	memcpy(&vip->vii_org, &dip->vdi_org, sizeof(vip->vii_org));
128 
129 	inode->i_mode = vxfs_transmod(vip);
130 	i_uid_write(inode, (uid_t)vip->vii_uid);
131 	i_gid_write(inode, (gid_t)vip->vii_gid);
132 
133 	set_nlink(inode, vip->vii_nlink);
134 	inode->i_size = vip->vii_size;
135 
136 	inode->i_atime.tv_sec = vip->vii_atime;
137 	inode->i_ctime.tv_sec = vip->vii_ctime;
138 	inode->i_mtime.tv_sec = vip->vii_mtime;
139 	inode->i_atime.tv_nsec = 0;
140 	inode->i_ctime.tv_nsec = 0;
141 	inode->i_mtime.tv_nsec = 0;
142 
143 	inode->i_blocks = vip->vii_blocks;
144 	inode->i_generation = vip->vii_gen;
145 }
146 
147 /**
148  * vxfs_blkiget - find inode based on extent #
149  * @sbp:	superblock of the filesystem we search in
150  * @extent:	number of the extent to search
151  * @ino:	inode number to search
152  *
153  * Description:
154  *  vxfs_blkiget searches inode @ino in the filesystem described by
155  *  @sbp in the extent @extent.
156  *  Returns the matching VxFS inode on success, else a NULL pointer.
157  *
158  * NOTE:
159  *  While __vxfs_iget uses the pagecache vxfs_blkiget uses the
160  *  buffercache.  This function should not be used outside the
161  *  read_super() method, otherwise the data may be incoherent.
162  */
163 struct inode *
vxfs_blkiget(struct super_block * sbp,u_long extent,ino_t ino)164 vxfs_blkiget(struct super_block *sbp, u_long extent, ino_t ino)
165 {
166 	struct buffer_head		*bp;
167 	struct inode			*inode;
168 	u_long				block, offset;
169 
170 	inode = new_inode(sbp);
171 	if (!inode)
172 		return NULL;
173 	inode->i_ino = get_next_ino();
174 
175 	block = extent + ((ino * VXFS_ISIZE) / sbp->s_blocksize);
176 	offset = ((ino % (sbp->s_blocksize / VXFS_ISIZE)) * VXFS_ISIZE);
177 	bp = sb_bread(sbp, block);
178 
179 	if (bp && buffer_mapped(bp)) {
180 		struct vxfs_inode_info	*vip = VXFS_INO(inode);
181 		struct vxfs_dinode	*dip;
182 
183 		dip = (struct vxfs_dinode *)(bp->b_data + offset);
184 		dip2vip_cpy(VXFS_SBI(sbp), vip, dip);
185 		vip->vfs_inode.i_mapping->a_ops = &vxfs_aops;
186 #ifdef DIAGNOSTIC
187 		vxfs_dumpi(vip, ino);
188 #endif
189 		brelse(bp);
190 		return inode;
191 	}
192 
193 	printk(KERN_WARNING "vxfs: unable to read block %ld\n", block);
194 	brelse(bp);
195 	iput(inode);
196 	return NULL;
197 }
198 
199 /**
200  * __vxfs_iget - generic find inode facility
201  * @ilistp:		inode list
202  * @vip:		VxFS inode to fill in
203  * @ino:		inode number
204  *
205  * Description:
206  *  Search the for inode number @ino in the filesystem
207  *  described by @sbp.  Use the specified inode table (@ilistp).
208  *  Returns the matching inode on success, else an error code.
209  */
210 static int
__vxfs_iget(struct inode * ilistp,struct vxfs_inode_info * vip,ino_t ino)211 __vxfs_iget(struct inode *ilistp, struct vxfs_inode_info *vip, ino_t ino)
212 {
213 	struct page			*pp;
214 	u_long				offset;
215 
216 	offset = (ino % (PAGE_SIZE / VXFS_ISIZE)) * VXFS_ISIZE;
217 	pp = vxfs_get_page(ilistp->i_mapping, ino * VXFS_ISIZE / PAGE_SIZE);
218 
219 	if (!IS_ERR(pp)) {
220 		struct vxfs_dinode	*dip;
221 		caddr_t			kaddr = (char *)page_address(pp);
222 
223 		dip = (struct vxfs_dinode *)(kaddr + offset);
224 		dip2vip_cpy(VXFS_SBI(ilistp->i_sb), vip, dip);
225 		vip->vfs_inode.i_mapping->a_ops = &vxfs_aops;
226 #ifdef DIAGNOSTIC
227 		vxfs_dumpi(vip, ino);
228 #endif
229 		vxfs_put_page(pp);
230 		return 0;
231 	}
232 
233 	printk(KERN_WARNING "vxfs: error on page 0x%p for inode %ld\n",
234 		pp, (unsigned long)ino);
235 	return PTR_ERR(pp);
236 }
237 
238 /**
239  * vxfs_stiget - find inode using the structural inode list
240  * @sbp:	VFS superblock
241  * @ino:	inode #
242  *
243  * Description:
244  *  Find inode @ino in the filesystem described by @sbp using
245  *  the structural inode list.
246  *  Returns the matching inode on success, else a NULL pointer.
247  */
248 struct inode *
vxfs_stiget(struct super_block * sbp,ino_t ino)249 vxfs_stiget(struct super_block *sbp, ino_t ino)
250 {
251 	struct inode *inode;
252 	int error;
253 
254 	inode = new_inode(sbp);
255 	if (!inode)
256 		return NULL;
257 	inode->i_ino = get_next_ino();
258 
259 	error = __vxfs_iget(VXFS_SBI(sbp)->vsi_stilist, VXFS_INO(inode), ino);
260 	if (error) {
261 		iput(inode);
262 		return NULL;
263 	}
264 
265 	return inode;
266 }
267 
268 /**
269  * vxfs_iget - get an inode
270  * @sbp:	the superblock to get the inode for
271  * @ino:	the number of the inode to get
272  *
273  * Description:
274  *  vxfs_read_inode creates an inode, reads the disk inode for @ino and fills
275  *  in all relevant fields in the new inode.
276  */
277 struct inode *
vxfs_iget(struct super_block * sbp,ino_t ino)278 vxfs_iget(struct super_block *sbp, ino_t ino)
279 {
280 	struct vxfs_inode_info		*vip;
281 	const struct address_space_operations	*aops;
282 	struct inode *ip;
283 	int error;
284 
285 	ip = iget_locked(sbp, ino);
286 	if (!ip)
287 		return ERR_PTR(-ENOMEM);
288 	if (!(ip->i_state & I_NEW))
289 		return ip;
290 
291 	vip = VXFS_INO(ip);
292 	error = __vxfs_iget(VXFS_SBI(sbp)->vsi_ilist, vip, ino);
293 	if (error) {
294 		iget_failed(ip);
295 		return ERR_PTR(error);
296 	}
297 
298 	if (VXFS_ISIMMED(vip))
299 		aops = &vxfs_immed_aops;
300 	else
301 		aops = &vxfs_aops;
302 
303 	if (S_ISREG(ip->i_mode)) {
304 		ip->i_fop = &generic_ro_fops;
305 		ip->i_mapping->a_ops = aops;
306 	} else if (S_ISDIR(ip->i_mode)) {
307 		ip->i_op = &vxfs_dir_inode_ops;
308 		ip->i_fop = &vxfs_dir_operations;
309 		ip->i_mapping->a_ops = aops;
310 	} else if (S_ISLNK(ip->i_mode)) {
311 		if (!VXFS_ISIMMED(vip)) {
312 			ip->i_op = &page_symlink_inode_operations;
313 			inode_nohighmem(ip);
314 			ip->i_mapping->a_ops = &vxfs_aops;
315 		} else {
316 			ip->i_op = &simple_symlink_inode_operations;
317 			ip->i_link = vip->vii_immed.vi_immed;
318 			nd_terminate_link(ip->i_link, ip->i_size,
319 					  sizeof(vip->vii_immed.vi_immed) - 1);
320 		}
321 	} else
322 		init_special_inode(ip, ip->i_mode, old_decode_dev(vip->vii_rdev));
323 
324 	unlock_new_inode(ip);
325 	return ip;
326 }
327 
328 /**
329  * vxfs_evict_inode - remove inode from main memory
330  * @ip:		inode to discard.
331  *
332  * Description:
333  *  vxfs_evict_inode() is called on the final iput and frees the private
334  *  inode area.
335  */
336 void
vxfs_evict_inode(struct inode * ip)337 vxfs_evict_inode(struct inode *ip)
338 {
339 	truncate_inode_pages_final(&ip->i_data);
340 	clear_inode(ip);
341 }
342