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Linux/fs/freevxfs/vxfs_inode.c

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  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
 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
 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 
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 *
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
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 *
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 *
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
337 vxfs_evict_inode(struct inode *ip)
338 {
339         truncate_inode_pages_final(&ip->i_data);
340         clear_inode(ip);
341 }
342 

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