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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
40 lock_kernel();
41 if (sb->s_flags & MS_RDONLY)
42 goto clean;
43
44 /*
45 * If we are going to write out the super block,
46 * then attach current time stamp.
47 * But if the filesystem was marked clean, keep it clean.
48 */
49 old_time = fs32_to_cpu(sbi, *sbi->s_sb_time);
50 if (sbi->s_type == FSTYPE_SYSV4) {
51 if (*sbi->s_sb_state == cpu_to_fs32(sbi, 0x7c269d38 - old_time))
52 *sbi->s_sb_state = cpu_to_fs32(sbi, 0x7c269d38 - time);
53 *sbi->s_sb_time = cpu_to_fs32(sbi, time);
54 mark_buffer_dirty(sbi->s_bh2);
55 }
56clean:
57 sb->s_dirt = 0;
58 unlock_kernel();
59}
60
61static int sysv_remount(struct super_block *sb, int *flags, char *data)
62{
63 struct sysv_sb_info *sbi = SYSV_SB(sb);
64 if (sbi->s_forced_ro)
65 *flags |= MS_RDONLY;
66 if (!(*flags & MS_RDONLY))
67 sb->s_dirt = 1;
68 return 0;
69}
70
71static void sysv_put_super(struct super_block *sb)
72{
73 struct sysv_sb_info *sbi = SYSV_SB(sb);
74
75 if (!(sb->s_flags & MS_RDONLY)) {
76 /* XXX ext2 also updates the state here */
77 mark_buffer_dirty(sbi->s_bh1);
78 if (sbi->s_bh1 != sbi->s_bh2)
79 mark_buffer_dirty(sbi->s_bh2);
80 }
81
82 brelse(sbi->s_bh1);
83 if (sbi->s_bh1 != sbi->s_bh2)
84 brelse(sbi->s_bh2);
85
86 kfree(sbi);
87}
88
David Howells726c3342006-06-23 02:02:58 -070089static int sysv_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -070090{
David Howells726c3342006-06-23 02:02:58 -070091 struct super_block *sb = dentry->d_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 struct sysv_sb_info *sbi = SYSV_SB(sb);
Coly Li1c5b4542009-04-02 16:59:43 -070093 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070094
95 buf->f_type = sb->s_magic;
96 buf->f_bsize = sb->s_blocksize;
97 buf->f_blocks = sbi->s_ndatazones;
98 buf->f_bavail = buf->f_bfree = sysv_count_free_blocks(sb);
99 buf->f_files = sbi->s_ninodes;
100 buf->f_ffree = sysv_count_free_inodes(sb);
101 buf->f_namelen = SYSV_NAMELEN;
Coly Li1c5b4542009-04-02 16:59:43 -0700102 buf->f_fsid.val[0] = (u32)id;
103 buf->f_fsid.val[1] = (u32)(id >> 32);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 return 0;
105}
106
107/*
108 * NXI <-> N0XI for PDP, XIN <-> XIN0 for le32, NIX <-> 0NIX for be32
109 */
110static inline void read3byte(struct sysv_sb_info *sbi,
111 unsigned char * from, unsigned char * to)
112{
113 if (sbi->s_bytesex == BYTESEX_PDP) {
114 to[0] = from[0];
115 to[1] = 0;
116 to[2] = from[1];
117 to[3] = from[2];
118 } else if (sbi->s_bytesex == BYTESEX_LE) {
119 to[0] = from[0];
120 to[1] = from[1];
121 to[2] = from[2];
122 to[3] = 0;
123 } else {
124 to[0] = 0;
125 to[1] = from[0];
126 to[2] = from[1];
127 to[3] = from[2];
128 }
129}
130
131static inline void write3byte(struct sysv_sb_info *sbi,
132 unsigned char * from, unsigned char * to)
133{
134 if (sbi->s_bytesex == BYTESEX_PDP) {
135 to[0] = from[0];
136 to[1] = from[2];
137 to[2] = from[3];
138 } else if (sbi->s_bytesex == BYTESEX_LE) {
139 to[0] = from[0];
140 to[1] = from[1];
141 to[2] = from[2];
142 } else {
143 to[0] = from[1];
144 to[1] = from[2];
145 to[2] = from[3];
146 }
147}
148
Arjan van de Venc5ef1c42007-02-12 00:55:40 -0800149static const struct inode_operations sysv_symlink_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 .readlink = generic_readlink,
151 .follow_link = page_follow_link_light,
152 .put_link = page_put_link,
153 .getattr = sysv_getattr,
154};
155
156void sysv_set_inode(struct inode *inode, dev_t rdev)
157{
158 if (S_ISREG(inode->i_mode)) {
159 inode->i_op = &sysv_file_inode_operations;
160 inode->i_fop = &sysv_file_operations;
161 inode->i_mapping->a_ops = &sysv_aops;
162 } else if (S_ISDIR(inode->i_mode)) {
163 inode->i_op = &sysv_dir_inode_operations;
164 inode->i_fop = &sysv_dir_operations;
165 inode->i_mapping->a_ops = &sysv_aops;
166 } else if (S_ISLNK(inode->i_mode)) {
167 if (inode->i_blocks) {
168 inode->i_op = &sysv_symlink_inode_operations;
169 inode->i_mapping->a_ops = &sysv_aops;
Duane Griffin21acaf82008-12-19 20:47:16 +0000170 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 inode->i_op = &sysv_fast_symlink_inode_operations;
Duane Griffin21acaf82008-12-19 20:47:16 +0000172 nd_terminate_link(SYSV_I(inode)->i_data, inode->i_size,
173 sizeof(SYSV_I(inode)->i_data) - 1);
174 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 } else
176 init_special_inode(inode, inode->i_mode, rdev);
177}
178
David Howellsb8e13432008-02-07 00:15:47 -0800179struct inode *sysv_iget(struct super_block *sb, unsigned int ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 struct sysv_sb_info * sbi = SYSV_SB(sb);
182 struct buffer_head * bh;
183 struct sysv_inode * raw_inode;
184 struct sysv_inode_info * si;
David Howellsb8e13432008-02-07 00:15:47 -0800185 struct inode *inode;
186 unsigned int block;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187
188 if (!ino || ino > sbi->s_ninodes) {
189 printk("Bad inode number on dev %s: %d is out of range\n",
David Howellsb8e13432008-02-07 00:15:47 -0800190 sb->s_id, ino);
191 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 }
David Howellsb8e13432008-02-07 00:15:47 -0800193
194 inode = iget_locked(sb, ino);
195 if (!inode)
196 return ERR_PTR(-ENOMEM);
197 if (!(inode->i_state & I_NEW))
198 return inode;
199
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 raw_inode = sysv_raw_inode(sb, ino, &bh);
201 if (!raw_inode) {
202 printk("Major problem: unable to read inode from dev %s\n",
203 inode->i_sb->s_id);
204 goto bad_inode;
205 }
206 /* SystemV FS: kludge permissions if ino==SYSV_ROOT_INO ?? */
207 inode->i_mode = fs16_to_cpu(sbi, raw_inode->i_mode);
208 inode->i_uid = (uid_t)fs16_to_cpu(sbi, raw_inode->i_uid);
209 inode->i_gid = (gid_t)fs16_to_cpu(sbi, raw_inode->i_gid);
210 inode->i_nlink = fs16_to_cpu(sbi, raw_inode->i_nlink);
211 inode->i_size = fs32_to_cpu(sbi, raw_inode->i_size);
212 inode->i_atime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_atime);
213 inode->i_mtime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_mtime);
214 inode->i_ctime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_ctime);
215 inode->i_ctime.tv_nsec = 0;
216 inode->i_atime.tv_nsec = 0;
217 inode->i_mtime.tv_nsec = 0;
Theodore Ts'oba52de12006-09-27 01:50:49 -0700218 inode->i_blocks = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219
220 si = SYSV_I(inode);
221 for (block = 0; block < 10+1+1+1; block++)
222 read3byte(sbi, &raw_inode->i_data[3*block],
223 (u8 *)&si->i_data[block]);
224 brelse(bh);
225 si->i_dir_start_lookup = 0;
226 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
227 sysv_set_inode(inode,
228 old_decode_dev(fs32_to_cpu(sbi, si->i_data[0])));
229 else
230 sysv_set_inode(inode, 0);
David Howellsb8e13432008-02-07 00:15:47 -0800231 unlock_new_inode(inode);
232 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233
234bad_inode:
David Howellsb8e13432008-02-07 00:15:47 -0800235 iget_failed(inode);
236 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237}
238
239static struct buffer_head * sysv_update_inode(struct inode * inode)
240{
241 struct super_block * sb = inode->i_sb;
242 struct sysv_sb_info * sbi = SYSV_SB(sb);
243 struct buffer_head * bh;
244 struct sysv_inode * raw_inode;
245 struct sysv_inode_info * si;
246 unsigned int ino, block;
247
248 ino = inode->i_ino;
249 if (!ino || ino > sbi->s_ninodes) {
250 printk("Bad inode number on dev %s: %d is out of range\n",
251 inode->i_sb->s_id, ino);
252 return NULL;
253 }
254 raw_inode = sysv_raw_inode(sb, ino, &bh);
255 if (!raw_inode) {
256 printk("unable to read i-node block\n");
257 return NULL;
258 }
259
260 raw_inode->i_mode = cpu_to_fs16(sbi, inode->i_mode);
261 raw_inode->i_uid = cpu_to_fs16(sbi, fs_high2lowuid(inode->i_uid));
262 raw_inode->i_gid = cpu_to_fs16(sbi, fs_high2lowgid(inode->i_gid));
263 raw_inode->i_nlink = cpu_to_fs16(sbi, inode->i_nlink);
264 raw_inode->i_size = cpu_to_fs32(sbi, inode->i_size);
265 raw_inode->i_atime = cpu_to_fs32(sbi, inode->i_atime.tv_sec);
266 raw_inode->i_mtime = cpu_to_fs32(sbi, inode->i_mtime.tv_sec);
267 raw_inode->i_ctime = cpu_to_fs32(sbi, inode->i_ctime.tv_sec);
268
269 si = SYSV_I(inode);
270 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
271 si->i_data[0] = cpu_to_fs32(sbi, old_encode_dev(inode->i_rdev));
272 for (block = 0; block < 10+1+1+1; block++)
273 write3byte(sbi, (u8 *)&si->i_data[block],
274 &raw_inode->i_data[3*block]);
275 mark_buffer_dirty(bh);
276 return bh;
277}
278
279int sysv_write_inode(struct inode * inode, int wait)
280{
281 struct buffer_head *bh;
282 lock_kernel();
283 bh = sysv_update_inode(inode);
284 brelse(bh);
285 unlock_kernel();
286 return 0;
287}
288
289int sysv_sync_inode(struct inode * inode)
290{
291 int err = 0;
292 struct buffer_head *bh;
293
294 bh = sysv_update_inode(inode);
295 if (bh && buffer_dirty(bh)) {
296 sync_dirty_buffer(bh);
297 if (buffer_req(bh) && !buffer_uptodate(bh)) {
298 printk ("IO error syncing sysv inode [%s:%08lx]\n",
299 inode->i_sb->s_id, inode->i_ino);
300 err = -1;
301 }
302 }
303 else if (!bh)
304 err = -1;
305 brelse (bh);
306 return err;
307}
308
309static void sysv_delete_inode(struct inode *inode)
310{
Mark Fashehfef26652005-09-09 13:01:31 -0700311 truncate_inode_pages(&inode->i_data, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 inode->i_size = 0;
313 sysv_truncate(inode);
314 lock_kernel();
315 sysv_free_inode(inode);
316 unlock_kernel();
317}
318
Christoph Lametere18b8902006-12-06 20:33:20 -0800319static struct kmem_cache *sysv_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320
321static struct inode *sysv_alloc_inode(struct super_block *sb)
322{
323 struct sysv_inode_info *si;
324
Christoph Lametere94b1762006-12-06 20:33:17 -0800325 si = kmem_cache_alloc(sysv_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 if (!si)
327 return NULL;
328 return &si->vfs_inode;
329}
330
331static void sysv_destroy_inode(struct inode *inode)
332{
333 kmem_cache_free(sysv_inode_cachep, SYSV_I(inode));
334}
335
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700336static void init_once(void *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337{
338 struct sysv_inode_info *si = (struct sysv_inode_info *)p;
339
Christoph Lametera35afb82007-05-16 22:10:57 -0700340 inode_init_once(&si->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341}
342
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800343const struct super_operations sysv_sops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 .alloc_inode = sysv_alloc_inode,
345 .destroy_inode = sysv_destroy_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 .write_inode = sysv_write_inode,
347 .delete_inode = sysv_delete_inode,
348 .put_super = sysv_put_super,
349 .write_super = sysv_write_super,
350 .remount_fs = sysv_remount,
351 .statfs = sysv_statfs,
352};
353
354int __init sysv_init_icache(void)
355{
356 sysv_inode_cachep = kmem_cache_create("sysv_inode_cache",
357 sizeof(struct sysv_inode_info), 0,
Paul Jackson4b6a9312006-03-24 03:16:05 -0800358 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
Paul Mundt20c2df82007-07-20 10:11:58 +0900359 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 if (!sysv_inode_cachep)
361 return -ENOMEM;
362 return 0;
363}
364
365void sysv_destroy_icache(void)
366{
367 kmem_cache_destroy(sysv_inode_cachep);
368}