blob: a3f45fc626a1635d3c6e487f27830572c990c8de [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/sysv/inode.c
3 *
4 * minix/inode.c
5 * Copyright (C) 1991, 1992 Linus Torvalds
6 *
7 * xenix/inode.c
8 * Copyright (C) 1992 Doug Evans
9 *
10 * coh/inode.c
11 * Copyright (C) 1993 Pascal Haible, Bruno Haible
12 *
13 * sysv/inode.c
14 * Copyright (C) 1993 Paul B. Monday
15 *
16 * sysv/inode.c
17 * Copyright (C) 1993 Bruno Haible
18 * Copyright (C) 1997, 1998 Krzysztof G. Baranowski
19 *
20 * This file contains code for allocating/freeing inodes and for read/writing
21 * the superblock.
22 */
23
24#include <linux/smp_lock.h>
25#include <linux/highuid.h>
26#include <linux/slab.h>
27#include <linux/init.h>
28#include <linux/buffer_head.h>
29#include <linux/vfs.h>
Duane Griffin21acaf82008-12-19 20:47:16 +000030#include <linux/namei.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <asm/byteorder.h>
32#include "sysv.h"
33
34/* This is only called on sync() and umount(), when s_dirt=1. */
35static void sysv_write_super(struct super_block *sb)
36{
37 struct sysv_sb_info *sbi = SYSV_SB(sb);
38 unsigned long time = get_seconds(), old_time;
39
Christoph Hellwigebc1ac12009-05-11 23:35:03 +020040 lock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 lock_kernel();
42 if (sb->s_flags & MS_RDONLY)
43 goto clean;
44
45 /*
46 * If we are going to write out the super block,
47 * then attach current time stamp.
48 * But if the filesystem was marked clean, keep it clean.
49 */
50 old_time = fs32_to_cpu(sbi, *sbi->s_sb_time);
51 if (sbi->s_type == FSTYPE_SYSV4) {
52 if (*sbi->s_sb_state == cpu_to_fs32(sbi, 0x7c269d38 - old_time))
53 *sbi->s_sb_state = cpu_to_fs32(sbi, 0x7c269d38 - time);
54 *sbi->s_sb_time = cpu_to_fs32(sbi, time);
55 mark_buffer_dirty(sbi->s_bh2);
56 }
57clean:
58 sb->s_dirt = 0;
59 unlock_kernel();
Christoph Hellwigebc1ac12009-05-11 23:35:03 +020060 unlock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070061}
62
63static int sysv_remount(struct super_block *sb, int *flags, char *data)
64{
65 struct sysv_sb_info *sbi = SYSV_SB(sb);
Al Virobbd68512009-05-06 10:43:07 -040066 lock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 if (sbi->s_forced_ro)
68 *flags |= MS_RDONLY;
69 if (!(*flags & MS_RDONLY))
70 sb->s_dirt = 1;
Al Virobbd68512009-05-06 10:43:07 -040071 unlock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 return 0;
73}
74
75static void sysv_put_super(struct super_block *sb)
76{
77 struct sysv_sb_info *sbi = SYSV_SB(sb);
78
Christoph Hellwig6cfd0142009-05-05 15:40:36 +020079 lock_kernel();
80
Christoph Hellwig8c85e122009-04-28 18:00:26 +020081 if (sb->s_dirt)
82 sysv_write_super(sb);
83
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 if (!(sb->s_flags & MS_RDONLY)) {
85 /* XXX ext2 also updates the state here */
86 mark_buffer_dirty(sbi->s_bh1);
87 if (sbi->s_bh1 != sbi->s_bh2)
88 mark_buffer_dirty(sbi->s_bh2);
89 }
90
91 brelse(sbi->s_bh1);
92 if (sbi->s_bh1 != sbi->s_bh2)
93 brelse(sbi->s_bh2);
94
95 kfree(sbi);
Christoph Hellwig6cfd0142009-05-05 15:40:36 +020096
97 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -070098}
99
David Howells726c3342006-06-23 02:02:58 -0700100static int sysv_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101{
David Howells726c3342006-06-23 02:02:58 -0700102 struct super_block *sb = dentry->d_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 struct sysv_sb_info *sbi = SYSV_SB(sb);
Coly Li1c5b4542009-04-02 16:59:43 -0700104 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105
106 buf->f_type = sb->s_magic;
107 buf->f_bsize = sb->s_blocksize;
108 buf->f_blocks = sbi->s_ndatazones;
109 buf->f_bavail = buf->f_bfree = sysv_count_free_blocks(sb);
110 buf->f_files = sbi->s_ninodes;
111 buf->f_ffree = sysv_count_free_inodes(sb);
112 buf->f_namelen = SYSV_NAMELEN;
Coly Li1c5b4542009-04-02 16:59:43 -0700113 buf->f_fsid.val[0] = (u32)id;
114 buf->f_fsid.val[1] = (u32)(id >> 32);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 return 0;
116}
117
118/*
119 * NXI <-> N0XI for PDP, XIN <-> XIN0 for le32, NIX <-> 0NIX for be32
120 */
121static inline void read3byte(struct sysv_sb_info *sbi,
122 unsigned char * from, unsigned char * to)
123{
124 if (sbi->s_bytesex == BYTESEX_PDP) {
125 to[0] = from[0];
126 to[1] = 0;
127 to[2] = from[1];
128 to[3] = from[2];
129 } else if (sbi->s_bytesex == BYTESEX_LE) {
130 to[0] = from[0];
131 to[1] = from[1];
132 to[2] = from[2];
133 to[3] = 0;
134 } else {
135 to[0] = 0;
136 to[1] = from[0];
137 to[2] = from[1];
138 to[3] = from[2];
139 }
140}
141
142static inline void write3byte(struct sysv_sb_info *sbi,
143 unsigned char * from, unsigned char * to)
144{
145 if (sbi->s_bytesex == BYTESEX_PDP) {
146 to[0] = from[0];
147 to[1] = from[2];
148 to[2] = from[3];
149 } else if (sbi->s_bytesex == BYTESEX_LE) {
150 to[0] = from[0];
151 to[1] = from[1];
152 to[2] = from[2];
153 } else {
154 to[0] = from[1];
155 to[1] = from[2];
156 to[2] = from[3];
157 }
158}
159
Arjan van de Venc5ef1c42007-02-12 00:55:40 -0800160static const struct inode_operations sysv_symlink_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 .readlink = generic_readlink,
162 .follow_link = page_follow_link_light,
163 .put_link = page_put_link,
164 .getattr = sysv_getattr,
165};
166
167void sysv_set_inode(struct inode *inode, dev_t rdev)
168{
169 if (S_ISREG(inode->i_mode)) {
170 inode->i_op = &sysv_file_inode_operations;
171 inode->i_fop = &sysv_file_operations;
172 inode->i_mapping->a_ops = &sysv_aops;
173 } else if (S_ISDIR(inode->i_mode)) {
174 inode->i_op = &sysv_dir_inode_operations;
175 inode->i_fop = &sysv_dir_operations;
176 inode->i_mapping->a_ops = &sysv_aops;
177 } else if (S_ISLNK(inode->i_mode)) {
178 if (inode->i_blocks) {
179 inode->i_op = &sysv_symlink_inode_operations;
180 inode->i_mapping->a_ops = &sysv_aops;
Duane Griffin21acaf82008-12-19 20:47:16 +0000181 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 inode->i_op = &sysv_fast_symlink_inode_operations;
Duane Griffin21acaf82008-12-19 20:47:16 +0000183 nd_terminate_link(SYSV_I(inode)->i_data, inode->i_size,
184 sizeof(SYSV_I(inode)->i_data) - 1);
185 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 } else
187 init_special_inode(inode, inode->i_mode, rdev);
188}
189
David Howellsb8e13432008-02-07 00:15:47 -0800190struct inode *sysv_iget(struct super_block *sb, unsigned int ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 struct sysv_sb_info * sbi = SYSV_SB(sb);
193 struct buffer_head * bh;
194 struct sysv_inode * raw_inode;
195 struct sysv_inode_info * si;
David Howellsb8e13432008-02-07 00:15:47 -0800196 struct inode *inode;
197 unsigned int block;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198
199 if (!ino || ino > sbi->s_ninodes) {
200 printk("Bad inode number on dev %s: %d is out of range\n",
David Howellsb8e13432008-02-07 00:15:47 -0800201 sb->s_id, ino);
202 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 }
David Howellsb8e13432008-02-07 00:15:47 -0800204
205 inode = iget_locked(sb, ino);
206 if (!inode)
207 return ERR_PTR(-ENOMEM);
208 if (!(inode->i_state & I_NEW))
209 return inode;
210
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 raw_inode = sysv_raw_inode(sb, ino, &bh);
212 if (!raw_inode) {
213 printk("Major problem: unable to read inode from dev %s\n",
214 inode->i_sb->s_id);
215 goto bad_inode;
216 }
217 /* SystemV FS: kludge permissions if ino==SYSV_ROOT_INO ?? */
218 inode->i_mode = fs16_to_cpu(sbi, raw_inode->i_mode);
219 inode->i_uid = (uid_t)fs16_to_cpu(sbi, raw_inode->i_uid);
220 inode->i_gid = (gid_t)fs16_to_cpu(sbi, raw_inode->i_gid);
221 inode->i_nlink = fs16_to_cpu(sbi, raw_inode->i_nlink);
222 inode->i_size = fs32_to_cpu(sbi, raw_inode->i_size);
223 inode->i_atime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_atime);
224 inode->i_mtime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_mtime);
225 inode->i_ctime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_ctime);
226 inode->i_ctime.tv_nsec = 0;
227 inode->i_atime.tv_nsec = 0;
228 inode->i_mtime.tv_nsec = 0;
Theodore Ts'oba52de12006-09-27 01:50:49 -0700229 inode->i_blocks = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230
231 si = SYSV_I(inode);
232 for (block = 0; block < 10+1+1+1; block++)
233 read3byte(sbi, &raw_inode->i_data[3*block],
234 (u8 *)&si->i_data[block]);
235 brelse(bh);
236 si->i_dir_start_lookup = 0;
237 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
238 sysv_set_inode(inode,
239 old_decode_dev(fs32_to_cpu(sbi, si->i_data[0])));
240 else
241 sysv_set_inode(inode, 0);
David Howellsb8e13432008-02-07 00:15:47 -0800242 unlock_new_inode(inode);
243 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244
245bad_inode:
David Howellsb8e13432008-02-07 00:15:47 -0800246 iget_failed(inode);
247 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248}
249
250static struct buffer_head * sysv_update_inode(struct inode * inode)
251{
252 struct super_block * sb = inode->i_sb;
253 struct sysv_sb_info * sbi = SYSV_SB(sb);
254 struct buffer_head * bh;
255 struct sysv_inode * raw_inode;
256 struct sysv_inode_info * si;
257 unsigned int ino, block;
258
259 ino = inode->i_ino;
260 if (!ino || ino > sbi->s_ninodes) {
261 printk("Bad inode number on dev %s: %d is out of range\n",
262 inode->i_sb->s_id, ino);
263 return NULL;
264 }
265 raw_inode = sysv_raw_inode(sb, ino, &bh);
266 if (!raw_inode) {
267 printk("unable to read i-node block\n");
268 return NULL;
269 }
270
271 raw_inode->i_mode = cpu_to_fs16(sbi, inode->i_mode);
272 raw_inode->i_uid = cpu_to_fs16(sbi, fs_high2lowuid(inode->i_uid));
273 raw_inode->i_gid = cpu_to_fs16(sbi, fs_high2lowgid(inode->i_gid));
274 raw_inode->i_nlink = cpu_to_fs16(sbi, inode->i_nlink);
275 raw_inode->i_size = cpu_to_fs32(sbi, inode->i_size);
276 raw_inode->i_atime = cpu_to_fs32(sbi, inode->i_atime.tv_sec);
277 raw_inode->i_mtime = cpu_to_fs32(sbi, inode->i_mtime.tv_sec);
278 raw_inode->i_ctime = cpu_to_fs32(sbi, inode->i_ctime.tv_sec);
279
280 si = SYSV_I(inode);
281 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
282 si->i_data[0] = cpu_to_fs32(sbi, old_encode_dev(inode->i_rdev));
283 for (block = 0; block < 10+1+1+1; block++)
284 write3byte(sbi, (u8 *)&si->i_data[block],
285 &raw_inode->i_data[3*block]);
286 mark_buffer_dirty(bh);
287 return bh;
288}
289
290int sysv_write_inode(struct inode * inode, int wait)
291{
292 struct buffer_head *bh;
293 lock_kernel();
294 bh = sysv_update_inode(inode);
295 brelse(bh);
296 unlock_kernel();
297 return 0;
298}
299
300int sysv_sync_inode(struct inode * inode)
301{
302 int err = 0;
303 struct buffer_head *bh;
304
305 bh = sysv_update_inode(inode);
306 if (bh && buffer_dirty(bh)) {
307 sync_dirty_buffer(bh);
308 if (buffer_req(bh) && !buffer_uptodate(bh)) {
309 printk ("IO error syncing sysv inode [%s:%08lx]\n",
310 inode->i_sb->s_id, inode->i_ino);
311 err = -1;
312 }
313 }
314 else if (!bh)
315 err = -1;
316 brelse (bh);
317 return err;
318}
319
320static void sysv_delete_inode(struct inode *inode)
321{
Mark Fashehfef26652005-09-09 13:01:31 -0700322 truncate_inode_pages(&inode->i_data, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 inode->i_size = 0;
324 sysv_truncate(inode);
325 lock_kernel();
326 sysv_free_inode(inode);
327 unlock_kernel();
328}
329
Christoph Lametere18b8902006-12-06 20:33:20 -0800330static struct kmem_cache *sysv_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331
332static struct inode *sysv_alloc_inode(struct super_block *sb)
333{
334 struct sysv_inode_info *si;
335
Christoph Lametere94b1762006-12-06 20:33:17 -0800336 si = kmem_cache_alloc(sysv_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 if (!si)
338 return NULL;
339 return &si->vfs_inode;
340}
341
342static void sysv_destroy_inode(struct inode *inode)
343{
344 kmem_cache_free(sysv_inode_cachep, SYSV_I(inode));
345}
346
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700347static void init_once(void *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348{
349 struct sysv_inode_info *si = (struct sysv_inode_info *)p;
350
Christoph Lametera35afb82007-05-16 22:10:57 -0700351 inode_init_once(&si->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352}
353
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800354const struct super_operations sysv_sops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 .alloc_inode = sysv_alloc_inode,
356 .destroy_inode = sysv_destroy_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 .write_inode = sysv_write_inode,
358 .delete_inode = sysv_delete_inode,
359 .put_super = sysv_put_super,
360 .write_super = sysv_write_super,
361 .remount_fs = sysv_remount,
362 .statfs = sysv_statfs,
363};
364
365int __init sysv_init_icache(void)
366{
367 sysv_inode_cachep = kmem_cache_create("sysv_inode_cache",
368 sizeof(struct sysv_inode_info), 0,
Paul Jackson4b6a9312006-03-24 03:16:05 -0800369 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
Paul Mundt20c2df82007-07-20 10:11:58 +0900370 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 if (!sysv_inode_cachep)
372 return -ENOMEM;
373 return 0;
374}
375
376void sysv_destroy_icache(void)
377{
378 kmem_cache_destroy(sysv_inode_cachep);
379}