~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/fs/freevxfs/vxfs_inode.c

Version: ~ [ linux-5.10-rc5 ] ~ [ linux-5.9.10 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.79 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.159 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.208 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.245 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.245 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 #include <linux/namei.h>
 39 
 40 #include "vxfs.h"
 41 #include "vxfs_inode.h"
 42 #include "vxfs_extern.h"
 43 
 44 
 45 struct kmem_cache               *vxfs_inode_cachep;
 46 
 47 
 48 #ifdef DIAGNOSTIC
 49 /*
 50  * Dump inode contents (partially).
 51  */
 52 void
 53 vxfs_dumpi(struct vxfs_inode_info *vip, ino_t ino)
 54 {
 55         printk(KERN_DEBUG "\n\n");
 56         if (ino)
 57                 printk(KERN_DEBUG "dumping vxfs inode %ld\n", ino);
 58         else
 59                 printk(KERN_DEBUG "dumping unknown vxfs inode\n");
 60 
 61         printk(KERN_DEBUG "---------------------------\n");
 62         printk(KERN_DEBUG "mode is %x\n", vip->vii_mode);
 63         printk(KERN_DEBUG "nlink:%u, uid:%u, gid:%u\n",
 64                         vip->vii_nlink, vip->vii_uid, vip->vii_gid);
 65         printk(KERN_DEBUG "size:%Lx, blocks:%u\n",
 66                         vip->vii_size, vip->vii_blocks);
 67         printk(KERN_DEBUG "orgtype:%u\n", vip->vii_orgtype);
 68 }
 69 #endif
 70 
 71 
 72 /**
 73  * vxfs_blkiget - find inode based on extent #
 74  * @sbp:        superblock of the filesystem we search in
 75  * @extent:     number of the extent to search
 76  * @ino:        inode number to search
 77  *
 78  * Description:
 79  *  vxfs_blkiget searches inode @ino in the filesystem described by
 80  *  @sbp in the extent @extent.
 81  *  Returns the matching VxFS inode on success, else a NULL pointer.
 82  *
 83  * NOTE:
 84  *  While __vxfs_iget uses the pagecache vxfs_blkiget uses the
 85  *  buffercache.  This function should not be used outside the
 86  *  read_super() method, otherwise the data may be incoherent.
 87  */
 88 struct vxfs_inode_info *
 89 vxfs_blkiget(struct super_block *sbp, u_long extent, ino_t ino)
 90 {
 91         struct buffer_head              *bp;
 92         u_long                          block, offset;
 93 
 94         block = extent + ((ino * VXFS_ISIZE) / sbp->s_blocksize);
 95         offset = ((ino % (sbp->s_blocksize / VXFS_ISIZE)) * VXFS_ISIZE);
 96         bp = sb_bread(sbp, block);
 97 
 98         if (bp && buffer_mapped(bp)) {
 99                 struct vxfs_inode_info  *vip;
100                 struct vxfs_dinode      *dip;
101 
102                 if (!(vip = kmem_cache_alloc(vxfs_inode_cachep, GFP_KERNEL)))
103                         goto fail;
104                 dip = (struct vxfs_dinode *)(bp->b_data + offset);
105                 memcpy(vip, dip, sizeof(*vip));
106 #ifdef DIAGNOSTIC
107                 vxfs_dumpi(vip, ino);
108 #endif
109                 brelse(bp);
110                 return (vip);
111         }
112 
113 fail:
114         printk(KERN_WARNING "vxfs: unable to read block %ld\n", block);
115         brelse(bp);
116         return NULL;
117 }
118 
119 /**
120  * __vxfs_iget - generic find inode facility
121  * @sbp:                VFS superblock
122  * @ino:                inode number
123  * @ilistp:             inode list
124  *
125  * Description:
126  *  Search the for inode number @ino in the filesystem
127  *  described by @sbp.  Use the specified inode table (@ilistp).
128  *  Returns the matching VxFS inode on success, else an error code.
129  */
130 static struct vxfs_inode_info *
131 __vxfs_iget(ino_t ino, struct inode *ilistp)
132 {
133         struct page                     *pp;
134         u_long                          offset;
135 
136         offset = (ino % (PAGE_SIZE / VXFS_ISIZE)) * VXFS_ISIZE;
137         pp = vxfs_get_page(ilistp->i_mapping, ino * VXFS_ISIZE / PAGE_SIZE);
138 
139         if (!IS_ERR(pp)) {
140                 struct vxfs_inode_info  *vip;
141                 struct vxfs_dinode      *dip;
142                 caddr_t                 kaddr = (char *)page_address(pp);
143 
144                 if (!(vip = kmem_cache_alloc(vxfs_inode_cachep, GFP_KERNEL)))
145                         goto fail;
146                 dip = (struct vxfs_dinode *)(kaddr + offset);
147                 memcpy(vip, dip, sizeof(*vip));
148 #ifdef DIAGNOSTIC
149                 vxfs_dumpi(vip, ino);
150 #endif
151                 vxfs_put_page(pp);
152                 return (vip);
153         }
154 
155         printk(KERN_WARNING "vxfs: error on page %p\n", pp);
156         return ERR_CAST(pp);
157 
158 fail:
159         printk(KERN_WARNING "vxfs: unable to read inode %ld\n", (unsigned long)ino);
160         vxfs_put_page(pp);
161         return ERR_PTR(-ENOMEM);
162 }
163 
164 /**
165  * vxfs_stiget - find inode using the structural inode list
166  * @sbp:        VFS superblock
167  * @ino:        inode #
168  *
169  * Description:
170  *  Find inode @ino in the filesystem described by @sbp using
171  *  the structural inode list.
172  *  Returns the matching VxFS inode on success, else a NULL pointer.
173  */
174 struct vxfs_inode_info *
175 vxfs_stiget(struct super_block *sbp, ino_t ino)
176 {
177         struct vxfs_inode_info *vip;
178 
179         vip = __vxfs_iget(ino, VXFS_SBI(sbp)->vsi_stilist);
180         return IS_ERR(vip) ? NULL : vip;
181 }
182 
183 /**
184  * vxfs_transmod - mode for a VxFS inode
185  * @vip:        VxFS inode
186  *
187  * Description:
188  *  vxfs_transmod returns a Linux mode_t for a given
189  *  VxFS inode structure.
190  */
191 static __inline__ umode_t
192 vxfs_transmod(struct vxfs_inode_info *vip)
193 {
194         umode_t                 ret = vip->vii_mode & ~VXFS_TYPE_MASK;
195 
196         if (VXFS_ISFIFO(vip))
197                 ret |= S_IFIFO;
198         if (VXFS_ISCHR(vip))
199                 ret |= S_IFCHR;
200         if (VXFS_ISDIR(vip))
201                 ret |= S_IFDIR;
202         if (VXFS_ISBLK(vip))
203                 ret |= S_IFBLK;
204         if (VXFS_ISLNK(vip))
205                 ret |= S_IFLNK;
206         if (VXFS_ISREG(vip))
207                 ret |= S_IFREG;
208         if (VXFS_ISSOC(vip))
209                 ret |= S_IFSOCK;
210 
211         return (ret);
212 }
213 
214 /**
215  * vxfs_iinit- helper to fill inode fields
216  * @ip:         VFS inode
217  * @vip:        VxFS inode
218  *
219  * Description:
220  *  vxfs_instino is a helper function to fill in all relevant
221  *  fields in @ip from @vip.
222  */
223 static void
224 vxfs_iinit(struct inode *ip, struct vxfs_inode_info *vip)
225 {
226 
227         ip->i_mode = vxfs_transmod(vip);
228         i_uid_write(ip, (uid_t)vip->vii_uid);
229         i_gid_write(ip, (gid_t)vip->vii_gid);
230 
231         set_nlink(ip, vip->vii_nlink);
232         ip->i_size = vip->vii_size;
233 
234         ip->i_atime.tv_sec = vip->vii_atime;
235         ip->i_ctime.tv_sec = vip->vii_ctime;
236         ip->i_mtime.tv_sec = vip->vii_mtime;
237         ip->i_atime.tv_nsec = 0;
238         ip->i_ctime.tv_nsec = 0;
239         ip->i_mtime.tv_nsec = 0;
240 
241         ip->i_blocks = vip->vii_blocks;
242         ip->i_generation = vip->vii_gen;
243 
244         ip->i_private = vip;
245         
246 }
247 
248 /**
249  * vxfs_get_fake_inode - get fake inode structure
250  * @sbp:                filesystem superblock
251  * @vip:                fspriv inode
252  *
253  * Description:
254  *  vxfs_fake_inode gets a fake inode (not in the inode hash) for a
255  *  superblock, vxfs_inode pair.
256  *  Returns the filled VFS inode.
257  */
258 struct inode *
259 vxfs_get_fake_inode(struct super_block *sbp, struct vxfs_inode_info *vip)
260 {
261         struct inode                    *ip = NULL;
262 
263         if ((ip = new_inode(sbp))) {
264                 ip->i_ino = get_next_ino();
265                 vxfs_iinit(ip, vip);
266                 ip->i_mapping->a_ops = &vxfs_aops;
267         }
268         return (ip);
269 }
270 
271 /**
272  * vxfs_put_fake_inode - free faked inode
273  * *ip:                 VFS inode
274  *
275  * Description:
276  *  vxfs_put_fake_inode frees all data associated with @ip.
277  */
278 void
279 vxfs_put_fake_inode(struct inode *ip)
280 {
281         iput(ip);
282 }
283 
284 /**
285  * vxfs_iget - get an inode
286  * @sbp:        the superblock to get the inode for
287  * @ino:        the number of the inode to get
288  *
289  * Description:
290  *  vxfs_read_inode creates an inode, reads the disk inode for @ino and fills
291  *  in all relevant fields in the new inode.
292  */
293 struct inode *
294 vxfs_iget(struct super_block *sbp, ino_t ino)
295 {
296         struct vxfs_inode_info          *vip;
297         const struct address_space_operations   *aops;
298         struct inode *ip;
299 
300         ip = iget_locked(sbp, ino);
301         if (!ip)
302                 return ERR_PTR(-ENOMEM);
303         if (!(ip->i_state & I_NEW))
304                 return ip;
305 
306         vip = __vxfs_iget(ino, VXFS_SBI(sbp)->vsi_ilist);
307         if (IS_ERR(vip)) {
308                 iget_failed(ip);
309                 return ERR_CAST(vip);
310         }
311 
312         vxfs_iinit(ip, vip);
313 
314         if (VXFS_ISIMMED(vip))
315                 aops = &vxfs_immed_aops;
316         else
317                 aops = &vxfs_aops;
318 
319         if (S_ISREG(ip->i_mode)) {
320                 ip->i_fop = &generic_ro_fops;
321                 ip->i_mapping->a_ops = aops;
322         } else if (S_ISDIR(ip->i_mode)) {
323                 ip->i_op = &vxfs_dir_inode_ops;
324                 ip->i_fop = &vxfs_dir_operations;
325                 ip->i_mapping->a_ops = aops;
326         } else if (S_ISLNK(ip->i_mode)) {
327                 if (!VXFS_ISIMMED(vip)) {
328                         ip->i_op = &page_symlink_inode_operations;
329                         inode_nohighmem(ip);
330                         ip->i_mapping->a_ops = &vxfs_aops;
331                 } else {
332                         ip->i_op = &simple_symlink_inode_operations;
333                         ip->i_link = vip->vii_immed.vi_immed;
334                         nd_terminate_link(ip->i_link, ip->i_size,
335                                           sizeof(vip->vii_immed.vi_immed) - 1);
336                 }
337         } else
338                 init_special_inode(ip, ip->i_mode, old_decode_dev(vip->vii_rdev));
339 
340         unlock_new_inode(ip);
341         return ip;
342 }
343 
344 static void vxfs_i_callback(struct rcu_head *head)
345 {
346         struct inode *inode = container_of(head, struct inode, i_rcu);
347         kmem_cache_free(vxfs_inode_cachep, inode->i_private);
348 }
349 
350 /**
351  * vxfs_evict_inode - remove inode from main memory
352  * @ip:         inode to discard.
353  *
354  * Description:
355  *  vxfs_evict_inode() is called on the final iput and frees the private
356  *  inode area.
357  */
358 void
359 vxfs_evict_inode(struct inode *ip)
360 {
361         truncate_inode_pages_final(&ip->i_data);
362         clear_inode(ip);
363         call_rcu(&ip->i_rcu, vxfs_i_callback);
364 }
365 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp