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Linux/fs/freevxfs/vxfs_inode.c

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  1 /*
  2  * Copyright (c) 2000-2001 Christoph Hellwig.
  3  * All rights reserved.
  4  *
  5  * Redistribution and use in source and binary forms, with or without
  6  * modification, are permitted provided that the following conditions
  7  * are met:
  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.
 13  *
 14  * Alternatively, this software may be distributed under the terms of the
 15  * GNU General Public License ("GPL").
 16  *
 17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 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
 27  * SUCH DAMAGE.
 28  */
 29 
 30 /*
 31  * Veritas filesystem driver - inode routines.
 32  */
 33 #include <linux/fs.h>
 34 #include <linux/buffer_head.h>
 35 #include <linux/pagemap.h>
 36 #include <linux/kernel.h>
 37 #include <linux/slab.h>
 38 
 39 #include "vxfs.h"
 40 #include "vxfs_inode.h"
 41 #include "vxfs_extern.h"
 42 
 43 
 44 struct kmem_cache               *vxfs_inode_cachep;
 45 
 46 
 47 #ifdef DIAGNOSTIC
 48 /*
 49  * Dump inode contents (partially).
 50  */
 51 void
 52 vxfs_dumpi(struct vxfs_inode_info *vip, ino_t ino)
 53 {
 54         printk(KERN_DEBUG "\n\n");
 55         if (ino)
 56                 printk(KERN_DEBUG "dumping vxfs inode %ld\n", ino);
 57         else
 58                 printk(KERN_DEBUG "dumping unknown vxfs inode\n");
 59 
 60         printk(KERN_DEBUG "---------------------------\n");
 61         printk(KERN_DEBUG "mode is %x\n", vip->vii_mode);
 62         printk(KERN_DEBUG "nlink:%u, uid:%u, gid:%u\n",
 63                         vip->vii_nlink, vip->vii_uid, vip->vii_gid);
 64         printk(KERN_DEBUG "size:%Lx, blocks:%u\n",
 65                         vip->vii_size, vip->vii_blocks);
 66         printk(KERN_DEBUG "orgtype:%u\n", vip->vii_orgtype);
 67 }
 68 #endif
 69 
 70 
 71 /**
 72  * vxfs_blkiget - find inode based on extent #
 73  * @sbp:        superblock of the filesystem we search in
 74  * @extent:     number of the extent to search
 75  * @ino:        inode number to search
 76  *
 77  * Description:
 78  *  vxfs_blkiget searches inode @ino in the filesystem described by
 79  *  @sbp in the extent @extent.
 80  *  Returns the matching VxFS inode on success, else a NULL pointer.
 81  *
 82  * NOTE:
 83  *  While __vxfs_iget uses the pagecache vxfs_blkiget uses the
 84  *  buffercache.  This function should not be used outside the
 85  *  read_super() method, otherwise the data may be incoherent.
 86  */
 87 struct vxfs_inode_info *
 88 vxfs_blkiget(struct super_block *sbp, u_long extent, ino_t ino)
 89 {
 90         struct buffer_head              *bp;
 91         u_long                          block, offset;
 92 
 93         block = extent + ((ino * VXFS_ISIZE) / sbp->s_blocksize);
 94         offset = ((ino % (sbp->s_blocksize / VXFS_ISIZE)) * VXFS_ISIZE);
 95         bp = sb_bread(sbp, block);
 96 
 97         if (bp && buffer_mapped(bp)) {
 98                 struct vxfs_inode_info  *vip;
 99                 struct vxfs_dinode      *dip;
100 
101                 if (!(vip = kmem_cache_alloc(vxfs_inode_cachep, GFP_KERNEL)))
102                         goto fail;
103                 dip = (struct vxfs_dinode *)(bp->b_data + offset);
104                 memcpy(vip, dip, sizeof(*vip));
105 #ifdef DIAGNOSTIC
106                 vxfs_dumpi(vip, ino);
107 #endif
108                 brelse(bp);
109                 return (vip);
110         }
111 
112 fail:
113         printk(KERN_WARNING "vxfs: unable to read block %ld\n", block);
114         brelse(bp);
115         return NULL;
116 }
117 
118 /**
119  * __vxfs_iget - generic find inode facility
120  * @sbp:                VFS superblock
121  * @ino:                inode number
122  * @ilistp:             inode list
123  *
124  * Description:
125  *  Search the for inode number @ino in the filesystem
126  *  described by @sbp.  Use the specified inode table (@ilistp).
127  *  Returns the matching VxFS inode on success, else an error code.
128  */
129 static struct vxfs_inode_info *
130 __vxfs_iget(ino_t ino, struct inode *ilistp)
131 {
132         struct page                     *pp;
133         u_long                          offset;
134 
135         offset = (ino % (PAGE_SIZE / VXFS_ISIZE)) * VXFS_ISIZE;
136         pp = vxfs_get_page(ilistp->i_mapping, ino * VXFS_ISIZE / PAGE_SIZE);
137 
138         if (!IS_ERR(pp)) {
139                 struct vxfs_inode_info  *vip;
140                 struct vxfs_dinode      *dip;
141                 caddr_t                 kaddr = (char *)page_address(pp);
142 
143                 if (!(vip = kmem_cache_alloc(vxfs_inode_cachep, GFP_KERNEL)))
144                         goto fail;
145                 dip = (struct vxfs_dinode *)(kaddr + offset);
146                 memcpy(vip, dip, sizeof(*vip));
147 #ifdef DIAGNOSTIC
148                 vxfs_dumpi(vip, ino);
149 #endif
150                 vxfs_put_page(pp);
151                 return (vip);
152         }
153 
154         printk(KERN_WARNING "vxfs: error on page %p\n", pp);
155         return ERR_CAST(pp);
156 
157 fail:
158         printk(KERN_WARNING "vxfs: unable to read inode %ld\n", (unsigned long)ino);
159         vxfs_put_page(pp);
160         return ERR_PTR(-ENOMEM);
161 }
162 
163 /**
164  * vxfs_stiget - find inode using the structural inode list
165  * @sbp:        VFS superblock
166  * @ino:        inode #
167  *
168  * Description:
169  *  Find inode @ino in the filesystem described by @sbp using
170  *  the structural inode list.
171  *  Returns the matching VxFS inode on success, else a NULL pointer.
172  */
173 struct vxfs_inode_info *
174 vxfs_stiget(struct super_block *sbp, ino_t ino)
175 {
176         struct vxfs_inode_info *vip;
177 
178         vip = __vxfs_iget(ino, VXFS_SBI(sbp)->vsi_stilist);
179         return IS_ERR(vip) ? NULL : vip;
180 }
181 
182 /**
183  * vxfs_transmod - mode for a VxFS inode
184  * @vip:        VxFS inode
185  *
186  * Description:
187  *  vxfs_transmod returns a Linux mode_t for a given
188  *  VxFS inode structure.
189  */
190 static __inline__ mode_t
191 vxfs_transmod(struct vxfs_inode_info *vip)
192 {
193         mode_t                  ret = vip->vii_mode & ~VXFS_TYPE_MASK;
194 
195         if (VXFS_ISFIFO(vip))
196                 ret |= S_IFIFO;
197         if (VXFS_ISCHR(vip))
198                 ret |= S_IFCHR;
199         if (VXFS_ISDIR(vip))
200                 ret |= S_IFDIR;
201         if (VXFS_ISBLK(vip))
202                 ret |= S_IFBLK;
203         if (VXFS_ISLNK(vip))
204                 ret |= S_IFLNK;
205         if (VXFS_ISREG(vip))
206                 ret |= S_IFREG;
207         if (VXFS_ISSOC(vip))
208                 ret |= S_IFSOCK;
209 
210         return (ret);
211 }
212 
213 /**
214  * vxfs_iinit- helper to fill inode fields
215  * @ip:         VFS inode
216  * @vip:        VxFS inode
217  *
218  * Description:
219  *  vxfs_instino is a helper function to fill in all relevant
220  *  fields in @ip from @vip.
221  */
222 static void
223 vxfs_iinit(struct inode *ip, struct vxfs_inode_info *vip)
224 {
225 
226         ip->i_mode = vxfs_transmod(vip);
227         ip->i_uid = (uid_t)vip->vii_uid;
228         ip->i_gid = (gid_t)vip->vii_gid;
229 
230         ip->i_nlink = vip->vii_nlink;
231         ip->i_size = vip->vii_size;
232 
233         ip->i_atime.tv_sec = vip->vii_atime;
234         ip->i_ctime.tv_sec = vip->vii_ctime;
235         ip->i_mtime.tv_sec = vip->vii_mtime;
236         ip->i_atime.tv_nsec = 0;
237         ip->i_ctime.tv_nsec = 0;
238         ip->i_mtime.tv_nsec = 0;
239 
240         ip->i_blocks = vip->vii_blocks;
241         ip->i_generation = vip->vii_gen;
242 
243         ip->i_private = vip;
244         
245 }
246 
247 /**
248  * vxfs_get_fake_inode - get fake inode structure
249  * @sbp:                filesystem superblock
250  * @vip:                fspriv inode
251  *
252  * Description:
253  *  vxfs_fake_inode gets a fake inode (not in the inode hash) for a
254  *  superblock, vxfs_inode pair.
255  *  Returns the filled VFS inode.
256  */
257 struct inode *
258 vxfs_get_fake_inode(struct super_block *sbp, struct vxfs_inode_info *vip)
259 {
260         struct inode                    *ip = NULL;
261 
262         if ((ip = new_inode(sbp))) {
263                 ip->i_ino = get_next_ino();
264                 vxfs_iinit(ip, vip);
265                 ip->i_mapping->a_ops = &vxfs_aops;
266         }
267         return (ip);
268 }
269 
270 /**
271  * vxfs_put_fake_inode - free faked inode
272  * *ip:                 VFS inode
273  *
274  * Description:
275  *  vxfs_put_fake_inode frees all data asssociated with @ip.
276  */
277 void
278 vxfs_put_fake_inode(struct inode *ip)
279 {
280         iput(ip);
281 }
282 
283 /**
284  * vxfs_iget - get an inode
285  * @sbp:        the superblock to get the inode for
286  * @ino:        the number of the inode to get
287  *
288  * Description:
289  *  vxfs_read_inode creates an inode, reads the disk inode for @ino and fills
290  *  in all relevant fields in the new inode.
291  */
292 struct inode *
293 vxfs_iget(struct super_block *sbp, ino_t ino)
294 {
295         struct vxfs_inode_info          *vip;
296         const struct address_space_operations   *aops;
297         struct inode *ip;
298 
299         ip = iget_locked(sbp, ino);
300         if (!ip)
301                 return ERR_PTR(-ENOMEM);
302         if (!(ip->i_state & I_NEW))
303                 return ip;
304 
305         vip = __vxfs_iget(ino, VXFS_SBI(sbp)->vsi_ilist);
306         if (IS_ERR(vip)) {
307                 iget_failed(ip);
308                 return ERR_CAST(vip);
309         }
310 
311         vxfs_iinit(ip, vip);
312 
313         if (VXFS_ISIMMED(vip))
314                 aops = &vxfs_immed_aops;
315         else
316                 aops = &vxfs_aops;
317 
318         if (S_ISREG(ip->i_mode)) {
319                 ip->i_fop = &generic_ro_fops;
320                 ip->i_mapping->a_ops = aops;
321         } else if (S_ISDIR(ip->i_mode)) {
322                 ip->i_op = &vxfs_dir_inode_ops;
323                 ip->i_fop = &vxfs_dir_operations;
324                 ip->i_mapping->a_ops = aops;
325         } else if (S_ISLNK(ip->i_mode)) {
326                 if (!VXFS_ISIMMED(vip)) {
327                         ip->i_op = &page_symlink_inode_operations;
328                         ip->i_mapping->a_ops = &vxfs_aops;
329                 } else {
330                         ip->i_op = &vxfs_immed_symlink_iops;
331                         vip->vii_immed.vi_immed[ip->i_size] = '\0';
332                 }
333         } else
334                 init_special_inode(ip, ip->i_mode, old_decode_dev(vip->vii_rdev));
335 
336         unlock_new_inode(ip);
337         return ip;
338 }
339 
340 static void vxfs_i_callback(struct rcu_head *head)
341 {
342         struct inode *inode = container_of(head, struct inode, i_rcu);
343         INIT_LIST_HEAD(&inode->i_dentry);
344         kmem_cache_free(vxfs_inode_cachep, inode->i_private);
345 }
346 
347 /**
348  * vxfs_evict_inode - remove inode from main memory
349  * @ip:         inode to discard.
350  *
351  * Description:
352  *  vxfs_evict_inode() is called on the final iput and frees the private
353  *  inode area.
354  */
355 void
356 vxfs_evict_inode(struct inode *ip)
357 {
358         truncate_inode_pages(&ip->i_data, 0);
359         end_writeback(ip);
360         call_rcu(&ip->i_rcu, vxfs_i_callback);
361 }
362 

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