blob: d62c423a5a2d8723807d2bb5f65b227042dcf724 [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>
Christoph Hellwiga9185b42010-03-05 09:21:37 +010029#include <linux/writeback.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
Christoph Hellwigad43ffd2009-06-08 10:07:45 +020034static int sysv_sync_fs(struct super_block *sb, int wait)
Linus Torvalds1da177e2005-04-16 15:20:36 -070035{
36 struct sysv_sb_info *sbi = SYSV_SB(sb);
37 unsigned long time = get_seconds(), old_time;
38
Marco Stornellic07cb012012-10-06 12:41:46 +020039 mutex_lock(&sbi->s_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
41 /*
42 * If we are going to write out the super block,
43 * then attach current time stamp.
44 * But if the filesystem was marked clean, keep it clean.
45 */
46 old_time = fs32_to_cpu(sbi, *sbi->s_sb_time);
47 if (sbi->s_type == FSTYPE_SYSV4) {
48 if (*sbi->s_sb_state == cpu_to_fs32(sbi, 0x7c269d38 - old_time))
49 *sbi->s_sb_state = cpu_to_fs32(sbi, 0x7c269d38 - time);
50 *sbi->s_sb_time = cpu_to_fs32(sbi, time);
51 mark_buffer_dirty(sbi->s_bh2);
52 }
Christoph Hellwigad43ffd2009-06-08 10:07:45 +020053
Marco Stornellic07cb012012-10-06 12:41:46 +020054 mutex_unlock(&sbi->s_lock);
Christoph Hellwigad43ffd2009-06-08 10:07:45 +020055
56 return 0;
57}
58
Linus Torvalds1da177e2005-04-16 15:20:36 -070059static int sysv_remount(struct super_block *sb, int *flags, char *data)
60{
61 struct sysv_sb_info *sbi = SYSV_SB(sb);
Artem Bityutskiyeee45892012-07-03 16:43:27 +030062
Theodore Ts'o02b99842014-03-13 10:14:33 -040063 sync_filesystem(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 if (sbi->s_forced_ro)
65 *flags |= MS_RDONLY;
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 return 0;
67}
68
69static void sysv_put_super(struct super_block *sb)
70{
71 struct sysv_sb_info *sbi = SYSV_SB(sb);
72
73 if (!(sb->s_flags & MS_RDONLY)) {
74 /* XXX ext2 also updates the state here */
75 mark_buffer_dirty(sbi->s_bh1);
76 if (sbi->s_bh1 != sbi->s_bh2)
77 mark_buffer_dirty(sbi->s_bh2);
78 }
79
80 brelse(sbi->s_bh1);
81 if (sbi->s_bh1 != sbi->s_bh2)
82 brelse(sbi->s_bh2);
83
84 kfree(sbi);
85}
86
David Howells726c3342006-06-23 02:02:58 -070087static int sysv_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -070088{
David Howells726c3342006-06-23 02:02:58 -070089 struct super_block *sb = dentry->d_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 struct sysv_sb_info *sbi = SYSV_SB(sb);
Coly Li1c5b4542009-04-02 16:59:43 -070091 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
93 buf->f_type = sb->s_magic;
94 buf->f_bsize = sb->s_blocksize;
95 buf->f_blocks = sbi->s_ndatazones;
96 buf->f_bavail = buf->f_bfree = sysv_count_free_blocks(sb);
97 buf->f_files = sbi->s_ninodes;
98 buf->f_ffree = sysv_count_free_inodes(sb);
99 buf->f_namelen = SYSV_NAMELEN;
Coly Li1c5b4542009-04-02 16:59:43 -0700100 buf->f_fsid.val[0] = (u32)id;
101 buf->f_fsid.val[1] = (u32)(id >> 32);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 return 0;
103}
104
105/*
106 * NXI <-> N0XI for PDP, XIN <-> XIN0 for le32, NIX <-> 0NIX for be32
107 */
108static inline void read3byte(struct sysv_sb_info *sbi,
109 unsigned char * from, unsigned char * to)
110{
111 if (sbi->s_bytesex == BYTESEX_PDP) {
112 to[0] = from[0];
113 to[1] = 0;
114 to[2] = from[1];
115 to[3] = from[2];
116 } else if (sbi->s_bytesex == BYTESEX_LE) {
117 to[0] = from[0];
118 to[1] = from[1];
119 to[2] = from[2];
120 to[3] = 0;
121 } else {
122 to[0] = 0;
123 to[1] = from[0];
124 to[2] = from[1];
125 to[3] = from[2];
126 }
127}
128
129static inline void write3byte(struct sysv_sb_info *sbi,
130 unsigned char * from, unsigned char * to)
131{
132 if (sbi->s_bytesex == BYTESEX_PDP) {
133 to[0] = from[0];
134 to[1] = from[2];
135 to[2] = from[3];
136 } else if (sbi->s_bytesex == BYTESEX_LE) {
137 to[0] = from[0];
138 to[1] = from[1];
139 to[2] = from[2];
140 } else {
141 to[0] = from[1];
142 to[1] = from[2];
143 to[2] = from[3];
144 }
145}
146
Arjan van de Venc5ef1c42007-02-12 00:55:40 -0800147static const struct inode_operations sysv_symlink_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 .readlink = generic_readlink,
Al Viro6b255392015-11-17 10:20:54 -0500149 .get_link = page_get_link,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 .getattr = sysv_getattr,
151};
152
153void sysv_set_inode(struct inode *inode, dev_t rdev)
154{
155 if (S_ISREG(inode->i_mode)) {
156 inode->i_op = &sysv_file_inode_operations;
157 inode->i_fop = &sysv_file_operations;
158 inode->i_mapping->a_ops = &sysv_aops;
159 } else if (S_ISDIR(inode->i_mode)) {
160 inode->i_op = &sysv_dir_inode_operations;
161 inode->i_fop = &sysv_dir_operations;
162 inode->i_mapping->a_ops = &sysv_aops;
163 } else if (S_ISLNK(inode->i_mode)) {
Al Viro0ebf7f12015-11-23 21:11:08 -0500164 inode->i_op = &sysv_symlink_inode_operations;
Al Viro21fc61c2015-11-17 01:07:57 -0500165 inode_nohighmem(inode);
Al Viro0ebf7f12015-11-23 21:11:08 -0500166 inode->i_mapping->a_ops = &sysv_aops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 } else
168 init_special_inode(inode, inode->i_mode, rdev);
169}
170
David Howellsb8e13432008-02-07 00:15:47 -0800171struct inode *sysv_iget(struct super_block *sb, unsigned int ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 struct sysv_sb_info * sbi = SYSV_SB(sb);
174 struct buffer_head * bh;
175 struct sysv_inode * raw_inode;
176 struct sysv_inode_info * si;
David Howellsb8e13432008-02-07 00:15:47 -0800177 struct inode *inode;
178 unsigned int block;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
180 if (!ino || ino > sbi->s_ninodes) {
181 printk("Bad inode number on dev %s: %d is out of range\n",
David Howellsb8e13432008-02-07 00:15:47 -0800182 sb->s_id, ino);
183 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 }
David Howellsb8e13432008-02-07 00:15:47 -0800185
186 inode = iget_locked(sb, ino);
187 if (!inode)
188 return ERR_PTR(-ENOMEM);
189 if (!(inode->i_state & I_NEW))
190 return inode;
191
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 raw_inode = sysv_raw_inode(sb, ino, &bh);
193 if (!raw_inode) {
194 printk("Major problem: unable to read inode from dev %s\n",
195 inode->i_sb->s_id);
196 goto bad_inode;
197 }
198 /* SystemV FS: kludge permissions if ino==SYSV_ROOT_INO ?? */
199 inode->i_mode = fs16_to_cpu(sbi, raw_inode->i_mode);
Eric W. Biedermana726ecc2012-02-10 12:19:23 -0800200 i_uid_write(inode, (uid_t)fs16_to_cpu(sbi, raw_inode->i_uid));
201 i_gid_write(inode, (gid_t)fs16_to_cpu(sbi, raw_inode->i_gid));
Miklos Szeredibfe86842011-10-28 14:13:29 +0200202 set_nlink(inode, fs16_to_cpu(sbi, raw_inode->i_nlink));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 inode->i_size = fs32_to_cpu(sbi, raw_inode->i_size);
204 inode->i_atime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_atime);
205 inode->i_mtime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_mtime);
206 inode->i_ctime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_ctime);
207 inode->i_ctime.tv_nsec = 0;
208 inode->i_atime.tv_nsec = 0;
209 inode->i_mtime.tv_nsec = 0;
Theodore Ts'oba52de12006-09-27 01:50:49 -0700210 inode->i_blocks = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211
212 si = SYSV_I(inode);
213 for (block = 0; block < 10+1+1+1; block++)
214 read3byte(sbi, &raw_inode->i_data[3*block],
215 (u8 *)&si->i_data[block]);
216 brelse(bh);
217 si->i_dir_start_lookup = 0;
218 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
219 sysv_set_inode(inode,
220 old_decode_dev(fs32_to_cpu(sbi, si->i_data[0])));
221 else
222 sysv_set_inode(inode, 0);
David Howellsb8e13432008-02-07 00:15:47 -0800223 unlock_new_inode(inode);
224 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225
226bad_inode:
David Howellsb8e13432008-02-07 00:15:47 -0800227 iget_failed(inode);
228 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229}
230
Christoph Hellwiga9185b42010-03-05 09:21:37 +0100231static int __sysv_write_inode(struct inode *inode, int wait)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232{
233 struct super_block * sb = inode->i_sb;
234 struct sysv_sb_info * sbi = SYSV_SB(sb);
235 struct buffer_head * bh;
236 struct sysv_inode * raw_inode;
237 struct sysv_inode_info * si;
238 unsigned int ino, block;
Al Viro05459ca2009-06-07 15:29:45 -0400239 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240
241 ino = inode->i_ino;
242 if (!ino || ino > sbi->s_ninodes) {
243 printk("Bad inode number on dev %s: %d is out of range\n",
244 inode->i_sb->s_id, ino);
Al Viro05459ca2009-06-07 15:29:45 -0400245 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 }
247 raw_inode = sysv_raw_inode(sb, ino, &bh);
248 if (!raw_inode) {
249 printk("unable to read i-node block\n");
Al Viro05459ca2009-06-07 15:29:45 -0400250 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 }
252
253 raw_inode->i_mode = cpu_to_fs16(sbi, inode->i_mode);
Eric W. Biedermana726ecc2012-02-10 12:19:23 -0800254 raw_inode->i_uid = cpu_to_fs16(sbi, fs_high2lowuid(i_uid_read(inode)));
255 raw_inode->i_gid = cpu_to_fs16(sbi, fs_high2lowgid(i_gid_read(inode)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 raw_inode->i_nlink = cpu_to_fs16(sbi, inode->i_nlink);
257 raw_inode->i_size = cpu_to_fs32(sbi, inode->i_size);
258 raw_inode->i_atime = cpu_to_fs32(sbi, inode->i_atime.tv_sec);
259 raw_inode->i_mtime = cpu_to_fs32(sbi, inode->i_mtime.tv_sec);
260 raw_inode->i_ctime = cpu_to_fs32(sbi, inode->i_ctime.tv_sec);
261
262 si = SYSV_I(inode);
263 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
264 si->i_data[0] = cpu_to_fs32(sbi, old_encode_dev(inode->i_rdev));
265 for (block = 0; block < 10+1+1+1; block++)
266 write3byte(sbi, (u8 *)&si->i_data[block],
267 &raw_inode->i_data[3*block]);
Al Viro05459ca2009-06-07 15:29:45 -0400268 mark_buffer_dirty(bh);
269 if (wait) {
270 sync_dirty_buffer(bh);
271 if (buffer_req(bh) && !buffer_uptodate(bh)) {
272 printk ("IO error syncing sysv inode [%s:%08x]\n",
273 sb->s_id, ino);
274 err = -EIO;
275 }
276 }
277 brelse(bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 return 0;
279}
280
Christoph Hellwiga9185b42010-03-05 09:21:37 +0100281int sysv_write_inode(struct inode *inode, struct writeback_control *wbc)
282{
283 return __sysv_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
284}
285
Al Viro05459ca2009-06-07 15:29:45 -0400286int sysv_sync_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287{
Christoph Hellwiga9185b42010-03-05 09:21:37 +0100288 return __sysv_write_inode(inode, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289}
290
Al Virod299ead2010-06-05 19:16:20 -0400291static void sysv_evict_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292{
Johannes Weiner91b0abe2014-04-03 14:47:49 -0700293 truncate_inode_pages_final(&inode->i_data);
Al Virod299ead2010-06-05 19:16:20 -0400294 if (!inode->i_nlink) {
295 inode->i_size = 0;
296 sysv_truncate(inode);
297 }
298 invalidate_inode_buffers(inode);
Jan Karadbd57682012-05-03 14:48:02 +0200299 clear_inode(inode);
Al Virod299ead2010-06-05 19:16:20 -0400300 if (!inode->i_nlink)
301 sysv_free_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302}
303
Christoph Lametere18b8902006-12-06 20:33:20 -0800304static struct kmem_cache *sysv_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305
306static struct inode *sysv_alloc_inode(struct super_block *sb)
307{
308 struct sysv_inode_info *si;
309
Christoph Lametere94b1762006-12-06 20:33:17 -0800310 si = kmem_cache_alloc(sysv_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 if (!si)
312 return NULL;
313 return &si->vfs_inode;
314}
315
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100316static void sysv_i_callback(struct rcu_head *head)
317{
318 struct inode *inode = container_of(head, struct inode, i_rcu);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100319 kmem_cache_free(sysv_inode_cachep, SYSV_I(inode));
320}
321
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322static void sysv_destroy_inode(struct inode *inode)
323{
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100324 call_rcu(&inode->i_rcu, sysv_i_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325}
326
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700327static void init_once(void *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328{
329 struct sysv_inode_info *si = (struct sysv_inode_info *)p;
330
Christoph Lametera35afb82007-05-16 22:10:57 -0700331 inode_init_once(&si->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332}
333
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800334const struct super_operations sysv_sops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 .alloc_inode = sysv_alloc_inode,
336 .destroy_inode = sysv_destroy_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 .write_inode = sysv_write_inode,
Al Virod299ead2010-06-05 19:16:20 -0400338 .evict_inode = sysv_evict_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 .put_super = sysv_put_super,
Christoph Hellwigad43ffd2009-06-08 10:07:45 +0200340 .sync_fs = sysv_sync_fs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 .remount_fs = sysv_remount,
342 .statfs = sysv_statfs,
343};
344
345int __init sysv_init_icache(void)
346{
347 sysv_inode_cachep = kmem_cache_create("sysv_inode_cache",
348 sizeof(struct sysv_inode_info), 0,
Vladimir Davydov5d097052016-01-14 15:18:21 -0800349 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|SLAB_ACCOUNT,
Paul Mundt20c2df82007-07-20 10:11:58 +0900350 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 if (!sysv_inode_cachep)
352 return -ENOMEM;
353 return 0;
354}
355
356void sysv_destroy_icache(void)
357{
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +1000358 /*
359 * Make sure all delayed rcu free inodes are flushed before we
360 * destroy cache.
361 */
362 rcu_barrier();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 kmem_cache_destroy(sysv_inode_cachep);
364}