blob: 9824743832a7212c4b1386b8127c712f62fa215b [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
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/highuid.h>
25#include <linux/slab.h>
26#include <linux/init.h>
27#include <linux/buffer_head.h>
28#include <linux/vfs.h>
Duane Griffin21acaf82008-12-19 20:47:16 +000029#include <linux/namei.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <asm/byteorder.h>
31#include "sysv.h"
32
Christoph Hellwigad43ffd2009-06-08 10:07:45 +020033static int sysv_sync_fs(struct super_block *sb, int wait)
Linus Torvalds1da177e2005-04-16 15:20:36 -070034{
35 struct sysv_sb_info *sbi = SYSV_SB(sb);
36 unsigned long time = get_seconds(), old_time;
37
Christoph Hellwigebc1ac12009-05-11 23:35:03 +020038 lock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
40 /*
41 * If we are going to write out the super block,
42 * then attach current time stamp.
43 * But if the filesystem was marked clean, keep it clean.
44 */
45 old_time = fs32_to_cpu(sbi, *sbi->s_sb_time);
46 if (sbi->s_type == FSTYPE_SYSV4) {
47 if (*sbi->s_sb_state == cpu_to_fs32(sbi, 0x7c269d38 - old_time))
48 *sbi->s_sb_state = cpu_to_fs32(sbi, 0x7c269d38 - time);
49 *sbi->s_sb_time = cpu_to_fs32(sbi, time);
50 mark_buffer_dirty(sbi->s_bh2);
51 }
Christoph Hellwigad43ffd2009-06-08 10:07:45 +020052
Christoph Hellwigebc1ac12009-05-11 23:35:03 +020053 unlock_super(sb);
Christoph Hellwigad43ffd2009-06-08 10:07:45 +020054
55 return 0;
56}
57
58static void sysv_write_super(struct super_block *sb)
59{
60 if (!(sb->s_flags & MS_RDONLY))
61 sysv_sync_fs(sb, 1);
62 else
63 sb->s_dirt = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070064}
65
66static int sysv_remount(struct super_block *sb, int *flags, char *data)
67{
68 struct sysv_sb_info *sbi = SYSV_SB(sb);
Al Virobbd68512009-05-06 10:43:07 -040069 lock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 if (sbi->s_forced_ro)
71 *flags |= MS_RDONLY;
72 if (!(*flags & MS_RDONLY))
73 sb->s_dirt = 1;
Al Virobbd68512009-05-06 10:43:07 -040074 unlock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 return 0;
76}
77
78static void sysv_put_super(struct super_block *sb)
79{
80 struct sysv_sb_info *sbi = SYSV_SB(sb);
81
Christoph Hellwig8c85e122009-04-28 18:00:26 +020082 if (sb->s_dirt)
83 sysv_write_super(sb);
84
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 if (!(sb->s_flags & MS_RDONLY)) {
86 /* XXX ext2 also updates the state here */
87 mark_buffer_dirty(sbi->s_bh1);
88 if (sbi->s_bh1 != sbi->s_bh2)
89 mark_buffer_dirty(sbi->s_bh2);
90 }
91
92 brelse(sbi->s_bh1);
93 if (sbi->s_bh1 != sbi->s_bh2)
94 brelse(sbi->s_bh2);
95
96 kfree(sbi);
97}
98
David Howells726c3342006-06-23 02:02:58 -070099static int sysv_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100{
David Howells726c3342006-06-23 02:02:58 -0700101 struct super_block *sb = dentry->d_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 struct sysv_sb_info *sbi = SYSV_SB(sb);
Coly Li1c5b4542009-04-02 16:59:43 -0700103 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104
105 buf->f_type = sb->s_magic;
106 buf->f_bsize = sb->s_blocksize;
107 buf->f_blocks = sbi->s_ndatazones;
108 buf->f_bavail = buf->f_bfree = sysv_count_free_blocks(sb);
109 buf->f_files = sbi->s_ninodes;
110 buf->f_ffree = sysv_count_free_inodes(sb);
111 buf->f_namelen = SYSV_NAMELEN;
Coly Li1c5b4542009-04-02 16:59:43 -0700112 buf->f_fsid.val[0] = (u32)id;
113 buf->f_fsid.val[1] = (u32)(id >> 32);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 return 0;
115}
116
117/*
118 * NXI <-> N0XI for PDP, XIN <-> XIN0 for le32, NIX <-> 0NIX for be32
119 */
120static inline void read3byte(struct sysv_sb_info *sbi,
121 unsigned char * from, unsigned char * to)
122{
123 if (sbi->s_bytesex == BYTESEX_PDP) {
124 to[0] = from[0];
125 to[1] = 0;
126 to[2] = from[1];
127 to[3] = from[2];
128 } else if (sbi->s_bytesex == BYTESEX_LE) {
129 to[0] = from[0];
130 to[1] = from[1];
131 to[2] = from[2];
132 to[3] = 0;
133 } else {
134 to[0] = 0;
135 to[1] = from[0];
136 to[2] = from[1];
137 to[3] = from[2];
138 }
139}
140
141static inline void write3byte(struct sysv_sb_info *sbi,
142 unsigned char * from, unsigned char * to)
143{
144 if (sbi->s_bytesex == BYTESEX_PDP) {
145 to[0] = from[0];
146 to[1] = from[2];
147 to[2] = from[3];
148 } else if (sbi->s_bytesex == BYTESEX_LE) {
149 to[0] = from[0];
150 to[1] = from[1];
151 to[2] = from[2];
152 } else {
153 to[0] = from[1];
154 to[1] = from[2];
155 to[2] = from[3];
156 }
157}
158
Arjan van de Venc5ef1c42007-02-12 00:55:40 -0800159static const struct inode_operations sysv_symlink_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 .readlink = generic_readlink,
161 .follow_link = page_follow_link_light,
162 .put_link = page_put_link,
163 .getattr = sysv_getattr,
164};
165
166void sysv_set_inode(struct inode *inode, dev_t rdev)
167{
168 if (S_ISREG(inode->i_mode)) {
169 inode->i_op = &sysv_file_inode_operations;
170 inode->i_fop = &sysv_file_operations;
171 inode->i_mapping->a_ops = &sysv_aops;
172 } else if (S_ISDIR(inode->i_mode)) {
173 inode->i_op = &sysv_dir_inode_operations;
174 inode->i_fop = &sysv_dir_operations;
175 inode->i_mapping->a_ops = &sysv_aops;
176 } else if (S_ISLNK(inode->i_mode)) {
177 if (inode->i_blocks) {
178 inode->i_op = &sysv_symlink_inode_operations;
179 inode->i_mapping->a_ops = &sysv_aops;
Duane Griffin21acaf82008-12-19 20:47:16 +0000180 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 inode->i_op = &sysv_fast_symlink_inode_operations;
Duane Griffin21acaf82008-12-19 20:47:16 +0000182 nd_terminate_link(SYSV_I(inode)->i_data, inode->i_size,
183 sizeof(SYSV_I(inode)->i_data) - 1);
184 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 } else
186 init_special_inode(inode, inode->i_mode, rdev);
187}
188
David Howellsb8e13432008-02-07 00:15:47 -0800189struct inode *sysv_iget(struct super_block *sb, unsigned int ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 struct sysv_sb_info * sbi = SYSV_SB(sb);
192 struct buffer_head * bh;
193 struct sysv_inode * raw_inode;
194 struct sysv_inode_info * si;
David Howellsb8e13432008-02-07 00:15:47 -0800195 struct inode *inode;
196 unsigned int block;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197
198 if (!ino || ino > sbi->s_ninodes) {
199 printk("Bad inode number on dev %s: %d is out of range\n",
David Howellsb8e13432008-02-07 00:15:47 -0800200 sb->s_id, ino);
201 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 }
David Howellsb8e13432008-02-07 00:15:47 -0800203
204 inode = iget_locked(sb, ino);
205 if (!inode)
206 return ERR_PTR(-ENOMEM);
207 if (!(inode->i_state & I_NEW))
208 return inode;
209
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 raw_inode = sysv_raw_inode(sb, ino, &bh);
211 if (!raw_inode) {
212 printk("Major problem: unable to read inode from dev %s\n",
213 inode->i_sb->s_id);
214 goto bad_inode;
215 }
216 /* SystemV FS: kludge permissions if ino==SYSV_ROOT_INO ?? */
217 inode->i_mode = fs16_to_cpu(sbi, raw_inode->i_mode);
218 inode->i_uid = (uid_t)fs16_to_cpu(sbi, raw_inode->i_uid);
219 inode->i_gid = (gid_t)fs16_to_cpu(sbi, raw_inode->i_gid);
220 inode->i_nlink = fs16_to_cpu(sbi, raw_inode->i_nlink);
221 inode->i_size = fs32_to_cpu(sbi, raw_inode->i_size);
222 inode->i_atime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_atime);
223 inode->i_mtime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_mtime);
224 inode->i_ctime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_ctime);
225 inode->i_ctime.tv_nsec = 0;
226 inode->i_atime.tv_nsec = 0;
227 inode->i_mtime.tv_nsec = 0;
Theodore Ts'oba52de12006-09-27 01:50:49 -0700228 inode->i_blocks = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229
230 si = SYSV_I(inode);
231 for (block = 0; block < 10+1+1+1; block++)
232 read3byte(sbi, &raw_inode->i_data[3*block],
233 (u8 *)&si->i_data[block]);
234 brelse(bh);
235 si->i_dir_start_lookup = 0;
236 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
237 sysv_set_inode(inode,
238 old_decode_dev(fs32_to_cpu(sbi, si->i_data[0])));
239 else
240 sysv_set_inode(inode, 0);
David Howellsb8e13432008-02-07 00:15:47 -0800241 unlock_new_inode(inode);
242 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243
244bad_inode:
David Howellsb8e13432008-02-07 00:15:47 -0800245 iget_failed(inode);
246 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247}
248
Al Viro05459ca2009-06-07 15:29:45 -0400249int sysv_write_inode(struct inode *inode, int wait)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250{
251 struct super_block * sb = inode->i_sb;
252 struct sysv_sb_info * sbi = SYSV_SB(sb);
253 struct buffer_head * bh;
254 struct sysv_inode * raw_inode;
255 struct sysv_inode_info * si;
256 unsigned int ino, block;
Al Viro05459ca2009-06-07 15:29:45 -0400257 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258
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);
Al Viro05459ca2009-06-07 15:29:45 -0400263 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 }
265 raw_inode = sysv_raw_inode(sb, ino, &bh);
266 if (!raw_inode) {
267 printk("unable to read i-node block\n");
Al Viro05459ca2009-06-07 15:29:45 -0400268 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 }
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]);
Al Viro05459ca2009-06-07 15:29:45 -0400286 mark_buffer_dirty(bh);
287 if (wait) {
288 sync_dirty_buffer(bh);
289 if (buffer_req(bh) && !buffer_uptodate(bh)) {
290 printk ("IO error syncing sysv inode [%s:%08x]\n",
291 sb->s_id, ino);
292 err = -EIO;
293 }
294 }
295 brelse(bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 return 0;
297}
298
Al Viro05459ca2009-06-07 15:29:45 -0400299int sysv_sync_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300{
Al Viro05459ca2009-06-07 15:29:45 -0400301 return sysv_write_inode(inode, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302}
303
304static void sysv_delete_inode(struct inode *inode)
305{
Mark Fashehfef26652005-09-09 13:01:31 -0700306 truncate_inode_pages(&inode->i_data, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 inode->i_size = 0;
308 sysv_truncate(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 sysv_free_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310}
311
Christoph Lametere18b8902006-12-06 20:33:20 -0800312static struct kmem_cache *sysv_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313
314static struct inode *sysv_alloc_inode(struct super_block *sb)
315{
316 struct sysv_inode_info *si;
317
Christoph Lametere94b1762006-12-06 20:33:17 -0800318 si = kmem_cache_alloc(sysv_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 if (!si)
320 return NULL;
321 return &si->vfs_inode;
322}
323
324static void sysv_destroy_inode(struct inode *inode)
325{
326 kmem_cache_free(sysv_inode_cachep, SYSV_I(inode));
327}
328
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700329static void init_once(void *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330{
331 struct sysv_inode_info *si = (struct sysv_inode_info *)p;
332
Christoph Lametera35afb82007-05-16 22:10:57 -0700333 inode_init_once(&si->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334}
335
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800336const struct super_operations sysv_sops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 .alloc_inode = sysv_alloc_inode,
338 .destroy_inode = sysv_destroy_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 .write_inode = sysv_write_inode,
340 .delete_inode = sysv_delete_inode,
341 .put_super = sysv_put_super,
342 .write_super = sysv_write_super,
Christoph Hellwigad43ffd2009-06-08 10:07:45 +0200343 .sync_fs = sysv_sync_fs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 .remount_fs = sysv_remount,
345 .statfs = sysv_statfs,
346};
347
348int __init sysv_init_icache(void)
349{
350 sysv_inode_cachep = kmem_cache_create("sysv_inode_cache",
351 sizeof(struct sysv_inode_info), 0,
Paul Jackson4b6a9312006-03-24 03:16:05 -0800352 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
Paul Mundt20c2df82007-07-20 10:11:58 +0900353 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 if (!sysv_inode_cachep)
355 return -ENOMEM;
356 return 0;
357}
358
359void sysv_destroy_icache(void)
360{
361 kmem_cache_destroy(sysv_inode_cachep);
362}