blob: 5d54b4ed1b6cf2319ad115121e5e30c9324205e4 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * JFFS2 -- Journalling Flash File System, Version 2.
3 *
David Woodhousec00c3102007-04-25 14:16:47 +01004 * Copyright © 2001-2007 Red Hat, Inc.
David Woodhouse6088c052010-08-08 14:15:22 +01005 * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 *
7 * Created by David Woodhouse <dwmw2@infradead.org>
8 *
9 * For licensing information, see the file 'LICENCE' in this directory.
10 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 */
12
Randy Dunlap16f7e0f2006-01-11 12:17:46 -080013#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/kernel.h>
15#include <linux/sched.h>
16#include <linux/fs.h>
17#include <linux/list.h>
18#include <linux/mtd/mtd.h>
19#include <linux/pagemap.h>
20#include <linux/slab.h>
21#include <linux/vmalloc.h>
22#include <linux/vfs.h>
23#include <linux/crc32.h>
24#include "nodelist.h"
25
26static int jffs2_flash_setup(struct jffs2_sb_info *c);
27
David Woodhouse9ed437c2007-08-22 12:39:19 +010028int jffs2_do_setattr (struct inode *inode, struct iattr *iattr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070029{
30 struct jffs2_full_dnode *old_metadata, *new_metadata;
31 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
32 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
33 struct jffs2_raw_inode *ri;
David Woodhouseaef9ab42006-05-19 00:28:49 +010034 union jffs2_device_node dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -070035 unsigned char *mdata = NULL;
36 int mdatalen = 0;
37 unsigned int ivalid;
David Woodhouse9fe48542006-05-23 00:38:06 +010038 uint32_t alloclen;
Linus Torvalds1da177e2005-04-16 15:20:36 -070039 int ret;
David Woodhousedd919662008-02-25 15:25:25 +000040 int alloc_type = ALLOC_NORMAL;
David Woodhouse9ed437c2007-08-22 12:39:19 +010041
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 D1(printk(KERN_DEBUG "jffs2_setattr(): ino #%lu\n", inode->i_ino));
Linus Torvalds1da177e2005-04-16 15:20:36 -070043
44 /* Special cases - we don't want more than one data node
45 for these types on the medium at any time. So setattr
46 must read the original data associated with the node
47 (i.e. the device numbers or the target name) and write
48 it out again with the appropriate data attached */
49 if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode)) {
50 /* For these, we don't actually need to read the old node */
David Woodhouseaef9ab42006-05-19 00:28:49 +010051 mdatalen = jffs2_encode_dev(&dev, inode->i_rdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 mdata = (char *)&dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 D1(printk(KERN_DEBUG "jffs2_setattr(): Writing %d bytes of kdev_t\n", mdatalen));
54 } else if (S_ISLNK(inode->i_mode)) {
David Woodhouseced22072008-04-22 15:13:40 +010055 mutex_lock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 mdatalen = f->metadata->size;
57 mdata = kmalloc(f->metadata->size, GFP_USER);
Dmitry Bazhenov422138d2006-05-05 22:46:49 +010058 if (!mdata) {
David Woodhouseced22072008-04-22 15:13:40 +010059 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 return -ENOMEM;
Dmitry Bazhenov422138d2006-05-05 22:46:49 +010061 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 ret = jffs2_read_dnode(c, f, f->metadata, mdata, 0, mdatalen);
63 if (ret) {
David Woodhouseced22072008-04-22 15:13:40 +010064 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 kfree(mdata);
66 return ret;
67 }
David Woodhouseced22072008-04-22 15:13:40 +010068 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 D1(printk(KERN_DEBUG "jffs2_setattr(): Writing %d bytes of symlink target\n", mdatalen));
70 }
71
72 ri = jffs2_alloc_raw_inode();
73 if (!ri) {
74 if (S_ISLNK(inode->i_mode))
75 kfree(mdata);
76 return -ENOMEM;
77 }
Thomas Gleixner182ec4e2005-11-07 11:16:07 +000078
David Woodhouse9fe48542006-05-23 00:38:06 +010079 ret = jffs2_reserve_space(c, sizeof(*ri) + mdatalen, &alloclen,
80 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 if (ret) {
82 jffs2_free_raw_inode(ri);
Al Viro61effb52011-07-24 17:11:33 -040083 if (S_ISLNK(inode->i_mode))
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 kfree(mdata);
85 return ret;
86 }
David Woodhouseced22072008-04-22 15:13:40 +010087 mutex_lock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 ivalid = iattr->ia_valid;
Thomas Gleixner182ec4e2005-11-07 11:16:07 +000089
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
91 ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE);
92 ri->totlen = cpu_to_je32(sizeof(*ri) + mdatalen);
93 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
94
95 ri->ino = cpu_to_je32(inode->i_ino);
96 ri->version = cpu_to_je32(++f->highest_version);
97
98 ri->uid = cpu_to_je16((ivalid & ATTR_UID)?iattr->ia_uid:inode->i_uid);
99 ri->gid = cpu_to_je16((ivalid & ATTR_GID)?iattr->ia_gid:inode->i_gid);
100
101 if (ivalid & ATTR_MODE)
David Woodhouse857013b2007-11-01 16:27:38 -0400102 ri->mode = cpu_to_jemode(iattr->ia_mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 else
104 ri->mode = cpu_to_jemode(inode->i_mode);
105
106
107 ri->isize = cpu_to_je32((ivalid & ATTR_SIZE)?iattr->ia_size:inode->i_size);
108 ri->atime = cpu_to_je32(I_SEC((ivalid & ATTR_ATIME)?iattr->ia_atime:inode->i_atime));
109 ri->mtime = cpu_to_je32(I_SEC((ivalid & ATTR_MTIME)?iattr->ia_mtime:inode->i_mtime));
110 ri->ctime = cpu_to_je32(I_SEC((ivalid & ATTR_CTIME)?iattr->ia_ctime:inode->i_ctime));
111
112 ri->offset = cpu_to_je32(0);
113 ri->csize = ri->dsize = cpu_to_je32(mdatalen);
114 ri->compr = JFFS2_COMPR_NONE;
115 if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) {
116 /* It's an extension. Make it a hole node */
117 ri->compr = JFFS2_COMPR_ZERO;
118 ri->dsize = cpu_to_je32(iattr->ia_size - inode->i_size);
119 ri->offset = cpu_to_je32(inode->i_size);
David Woodhousedd919662008-02-25 15:25:25 +0000120 } else if (ivalid & ATTR_SIZE && !iattr->ia_size) {
121 /* For truncate-to-zero, treat it as deletion because
122 it'll always be obsoleting all previous nodes */
123 alloc_type = ALLOC_DELETION;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 }
125 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
126 if (mdatalen)
127 ri->data_crc = cpu_to_je32(crc32(0, mdata, mdatalen));
128 else
129 ri->data_crc = cpu_to_je32(0);
130
David Woodhousedd919662008-02-25 15:25:25 +0000131 new_metadata = jffs2_write_dnode(c, f, ri, mdata, mdatalen, alloc_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 if (S_ISLNK(inode->i_mode))
133 kfree(mdata);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000134
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 if (IS_ERR(new_metadata)) {
136 jffs2_complete_reservation(c);
137 jffs2_free_raw_inode(ri);
David Woodhouseced22072008-04-22 15:13:40 +0100138 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 return PTR_ERR(new_metadata);
140 }
141 /* It worked. Update the inode */
142 inode->i_atime = ITIME(je32_to_cpu(ri->atime));
143 inode->i_ctime = ITIME(je32_to_cpu(ri->ctime));
144 inode->i_mtime = ITIME(je32_to_cpu(ri->mtime));
145 inode->i_mode = jemode_to_cpu(ri->mode);
146 inode->i_uid = je16_to_cpu(ri->uid);
147 inode->i_gid = je16_to_cpu(ri->gid);
148
149
150 old_metadata = f->metadata;
151
152 if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size)
Artem B. Bityutskiyf302cd02005-07-24 16:29:59 +0100153 jffs2_truncate_fragtree (c, &f->fragtree, iattr->ia_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154
155 if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) {
156 jffs2_add_full_dnode_to_inode(c, f, new_metadata);
157 inode->i_size = iattr->ia_size;
David Woodhouseb28ba9f2008-02-25 15:20:50 +0000158 inode->i_blocks = (inode->i_size + 511) >> 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 f->metadata = NULL;
160 } else {
161 f->metadata = new_metadata;
162 }
163 if (old_metadata) {
164 jffs2_mark_node_obsolete(c, old_metadata->raw);
165 jffs2_free_full_dnode(old_metadata);
166 }
167 jffs2_free_raw_inode(ri);
168
David Woodhouseced22072008-04-22 15:13:40 +0100169 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 jffs2_complete_reservation(c);
171
Christoph Hellwig2c27c652010-06-04 11:30:04 +0200172 /* We have to do the truncate_setsize() without f->sem held, since
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000173 some pages may be locked and waiting for it in readpage().
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 We are protected from a simultaneous write() extending i_size
175 back past iattr->ia_size, because do_truncate() holds the
176 generic inode semaphore. */
David Woodhouseb28ba9f2008-02-25 15:20:50 +0000177 if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) {
Christoph Hellwig2c27c652010-06-04 11:30:04 +0200178 truncate_setsize(inode, iattr->ia_size);
David Woodhouseb28ba9f2008-02-25 15:20:50 +0000179 inode->i_blocks = (inode->i_size + 511) >> 9;
180 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181
182 return 0;
183}
184
185int jffs2_setattr(struct dentry *dentry, struct iattr *iattr)
186{
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900187 int rc;
188
David Woodhouse9ed437c2007-08-22 12:39:19 +0100189 rc = inode_change_ok(dentry->d_inode, iattr);
190 if (rc)
191 return rc;
192
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900193 rc = jffs2_do_setattr(dentry->d_inode, iattr);
194 if (!rc && (iattr->ia_valid & ATTR_MODE))
195 rc = jffs2_acl_chmod(dentry->d_inode);
David Woodhouse9ed437c2007-08-22 12:39:19 +0100196
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900197 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198}
199
David Howells726c3342006-06-23 02:02:58 -0700200int jffs2_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201{
David Howells726c3342006-06-23 02:02:58 -0700202 struct jffs2_sb_info *c = JFFS2_SB_INFO(dentry->d_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 unsigned long avail;
204
205 buf->f_type = JFFS2_SUPER_MAGIC;
206 buf->f_bsize = 1 << PAGE_SHIFT;
207 buf->f_blocks = c->flash_size >> PAGE_SHIFT;
208 buf->f_files = 0;
209 buf->f_ffree = 0;
210 buf->f_namelen = JFFS2_MAX_NAME_LEN;
David Woodhouse75caf6b2008-08-18 16:23:53 +0100211 buf->f_fsid.val[0] = JFFS2_SUPER_MAGIC;
212 buf->f_fsid.val[1] = c->mtd->index;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213
214 spin_lock(&c->erase_completion_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 avail = c->dirty_size + c->free_size;
216 if (avail > c->sector_size * c->resv_blocks_write)
217 avail -= c->sector_size * c->resv_blocks_write;
218 else
219 avail = 0;
Artem B. Bityutskiye0c8e422005-07-24 16:14:17 +0100220 spin_unlock(&c->erase_completion_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221
222 buf->f_bavail = buf->f_bfree = avail >> PAGE_SHIFT;
223
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 return 0;
225}
226
227
Al Virob57922d2010-06-07 14:34:48 -0400228void jffs2_evict_inode (struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229{
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000230 /* We can forget about this inode for now - drop all
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 * the nodelists associated with it, etc.
232 */
233 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
234 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000235
Al Virob57922d2010-06-07 14:34:48 -0400236 D1(printk(KERN_DEBUG "jffs2_evict_inode(): ino #%lu mode %o\n", inode->i_ino, inode->i_mode));
237 truncate_inode_pages(&inode->i_data, 0);
238 end_writeback(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 jffs2_do_clear_inode(c, f);
240}
241
David Howells5451f792008-02-07 00:15:42 -0800242struct inode *jffs2_iget(struct super_block *sb, unsigned long ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243{
244 struct jffs2_inode_info *f;
245 struct jffs2_sb_info *c;
246 struct jffs2_raw_inode latest_node;
David Woodhouseaef9ab42006-05-19 00:28:49 +0100247 union jffs2_device_node jdev;
David Howells5451f792008-02-07 00:15:42 -0800248 struct inode *inode;
David Woodhouseaef9ab42006-05-19 00:28:49 +0100249 dev_t rdev = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 int ret;
251
David Howells5451f792008-02-07 00:15:42 -0800252 D1(printk(KERN_DEBUG "jffs2_iget(): ino == %lu\n", ino));
253
254 inode = iget_locked(sb, ino);
255 if (!inode)
256 return ERR_PTR(-ENOMEM);
257 if (!(inode->i_state & I_NEW))
258 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259
260 f = JFFS2_INODE_INFO(inode);
261 c = JFFS2_SB_INFO(inode->i_sb);
262
263 jffs2_init_inode_info(f);
David Woodhouseced22072008-04-22 15:13:40 +0100264 mutex_lock(&f->sem);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000265
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 ret = jffs2_do_read_inode(c, f, inode->i_ino, &latest_node);
267
268 if (ret) {
David Woodhouseced22072008-04-22 15:13:40 +0100269 mutex_unlock(&f->sem);
David Howells5451f792008-02-07 00:15:42 -0800270 iget_failed(inode);
271 return ERR_PTR(ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 }
273 inode->i_mode = jemode_to_cpu(latest_node.mode);
274 inode->i_uid = je16_to_cpu(latest_node.uid);
275 inode->i_gid = je16_to_cpu(latest_node.gid);
276 inode->i_size = je32_to_cpu(latest_node.isize);
277 inode->i_atime = ITIME(je32_to_cpu(latest_node.atime));
278 inode->i_mtime = ITIME(je32_to_cpu(latest_node.mtime));
279 inode->i_ctime = ITIME(je32_to_cpu(latest_node.ctime));
280
David Woodhouse27c72b02008-05-01 18:47:17 +0100281 inode->i_nlink = f->inocache->pino_nlink;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 inode->i_blocks = (inode->i_size + 511) >> 9;
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000284
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 switch (inode->i_mode & S_IFMT) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286
287 case S_IFLNK:
288 inode->i_op = &jffs2_symlink_inode_operations;
289 break;
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000290
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 case S_IFDIR:
292 {
293 struct jffs2_full_dirent *fd;
David Woodhouse27c72b02008-05-01 18:47:17 +0100294 inode->i_nlink = 2; /* parent and '.' */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295
296 for (fd=f->dents; fd; fd = fd->next) {
297 if (fd->type == DT_DIR && fd->ino)
Dave Hansend8c76e62006-09-30 23:29:04 -0700298 inc_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 /* Root dir gets i_nlink 3 for some reason */
301 if (inode->i_ino == 1)
Dave Hansend8c76e62006-09-30 23:29:04 -0700302 inc_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303
304 inode->i_op = &jffs2_dir_inode_operations;
305 inode->i_fop = &jffs2_dir_operations;
306 break;
307 }
308 case S_IFREG:
309 inode->i_op = &jffs2_file_inode_operations;
310 inode->i_fop = &jffs2_file_operations;
311 inode->i_mapping->a_ops = &jffs2_file_address_operations;
312 inode->i_mapping->nrpages = 0;
313 break;
314
315 case S_IFBLK:
316 case S_IFCHR:
317 /* Read the device numbers from the media */
Andrew Morton91f80262010-02-02 14:43:10 -0800318 if (f->metadata->size != sizeof(jdev.old_id) &&
319 f->metadata->size != sizeof(jdev.new_id)) {
David Woodhouseaef9ab42006-05-19 00:28:49 +0100320 printk(KERN_NOTICE "Device node has strange size %d\n", f->metadata->size);
David Howells5451f792008-02-07 00:15:42 -0800321 goto error_io;
David Woodhouseaef9ab42006-05-19 00:28:49 +0100322 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 D1(printk(KERN_DEBUG "Reading device numbers from flash\n"));
David Howells5451f792008-02-07 00:15:42 -0800324 ret = jffs2_read_dnode(c, f, f->metadata, (char *)&jdev, 0, f->metadata->size);
325 if (ret < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 /* Eep */
327 printk(KERN_NOTICE "Read device numbers for inode %lu failed\n", (unsigned long)inode->i_ino);
David Howells5451f792008-02-07 00:15:42 -0800328 goto error;
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000329 }
Andrew Morton91f80262010-02-02 14:43:10 -0800330 if (f->metadata->size == sizeof(jdev.old_id))
331 rdev = old_decode_dev(je16_to_cpu(jdev.old_id));
David Woodhouseaef9ab42006-05-19 00:28:49 +0100332 else
Andrew Morton91f80262010-02-02 14:43:10 -0800333 rdev = new_decode_dev(je32_to_cpu(jdev.new_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334
335 case S_IFSOCK:
336 case S_IFIFO:
337 inode->i_op = &jffs2_file_inode_operations;
David Woodhouseaef9ab42006-05-19 00:28:49 +0100338 init_special_inode(inode, inode->i_mode, rdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 break;
340
341 default:
342 printk(KERN_WARNING "jffs2_read_inode(): Bogus imode %o for ino %lu\n", inode->i_mode, (unsigned long)inode->i_ino);
343 }
344
David Woodhouseced22072008-04-22 15:13:40 +0100345 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346
347 D1(printk(KERN_DEBUG "jffs2_read_inode() returning\n"));
David Howells5451f792008-02-07 00:15:42 -0800348 unlock_new_inode(inode);
349 return inode;
350
351error_io:
352 ret = -EIO;
353error:
David Woodhouseced22072008-04-22 15:13:40 +0100354 mutex_unlock(&f->sem);
David Howells5451f792008-02-07 00:15:42 -0800355 jffs2_do_clear_inode(c, f);
356 iget_failed(inode);
357 return ERR_PTR(ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358}
359
Christoph Hellwigaa385722011-05-27 06:53:02 -0400360void jffs2_dirty_inode(struct inode *inode, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361{
362 struct iattr iattr;
363
364 if (!(inode->i_state & I_DIRTY_DATASYNC)) {
365 D2(printk(KERN_DEBUG "jffs2_dirty_inode() not calling setattr() for ino #%lu\n", inode->i_ino));
366 return;
367 }
368
369 D1(printk(KERN_DEBUG "jffs2_dirty_inode() calling setattr() for ino #%lu\n", inode->i_ino));
370
371 iattr.ia_valid = ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_MTIME|ATTR_CTIME;
372 iattr.ia_mode = inode->i_mode;
373 iattr.ia_uid = inode->i_uid;
374 iattr.ia_gid = inode->i_gid;
375 iattr.ia_atime = inode->i_atime;
376 iattr.ia_mtime = inode->i_mtime;
377 iattr.ia_ctime = inode->i_ctime;
378
379 jffs2_do_setattr(inode, &iattr);
380}
381
Andres Salomon92abc472011-10-16 18:15:16 -0700382int jffs2_do_remount_fs(struct super_block *sb, int *flags, char *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383{
384 struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
385
386 if (c->flags & JFFS2_SB_FLAG_RO && !(sb->s_flags & MS_RDONLY))
387 return -EROFS;
388
389 /* We stop if it was running, then restart if it needs to.
390 This also catches the case where it was stopped and this
391 is just a remount to restart it.
392 Flush the writebuffer, if neccecary, else we loose it */
393 if (!(sb->s_flags & MS_RDONLY)) {
394 jffs2_stop_garbage_collect_thread(c);
David Woodhouseced22072008-04-22 15:13:40 +0100395 mutex_lock(&c->alloc_sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 jffs2_flush_wbuf_pad(c);
David Woodhouseced22072008-04-22 15:13:40 +0100397 mutex_unlock(&c->alloc_sem);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000398 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399
400 if (!(*flags & MS_RDONLY))
401 jffs2_start_garbage_collect_thread(c);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000402
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 *flags |= MS_NOATIME;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 return 0;
405}
406
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407/* jffs2_new_inode: allocate a new inode and inocache, add it to the hash,
408 fill in the raw_inode while you're at it. */
Al Virod3fb6122011-07-23 18:37:50 -0400409struct inode *jffs2_new_inode (struct inode *dir_i, umode_t mode, struct jffs2_raw_inode *ri)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410{
411 struct inode *inode;
412 struct super_block *sb = dir_i->i_sb;
413 struct jffs2_sb_info *c;
414 struct jffs2_inode_info *f;
415 int ret;
416
417 D1(printk(KERN_DEBUG "jffs2_new_inode(): dir_i %ld, mode 0x%x\n", dir_i->i_ino, mode));
418
419 c = JFFS2_SB_INFO(sb);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000420
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 inode = new_inode(sb);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000422
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 if (!inode)
424 return ERR_PTR(-ENOMEM);
425
426 f = JFFS2_INODE_INFO(inode);
427 jffs2_init_inode_info(f);
David Woodhouseced22072008-04-22 15:13:40 +0100428 mutex_lock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429
430 memset(ri, 0, sizeof(*ri));
431 /* Set OS-specific defaults for new inodes */
David Howells3fc678a2008-08-27 14:48:32 +0100432 ri->uid = cpu_to_je16(current_fsuid());
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433
434 if (dir_i->i_mode & S_ISGID) {
435 ri->gid = cpu_to_je16(dir_i->i_gid);
436 if (S_ISDIR(mode))
437 mode |= S_ISGID;
438 } else {
David Howells3fc678a2008-08-27 14:48:32 +0100439 ri->gid = cpu_to_je16(current_fsgid());
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 }
David Woodhouse9ed437c2007-08-22 12:39:19 +0100441
442 /* POSIX ACLs have to be processed now, at least partly.
443 The umask is only applied if there's no default ACL */
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900444 ret = jffs2_init_acl_pre(dir_i, inode, &mode);
445 if (ret) {
446 make_bad_inode(inode);
447 iput(inode);
448 return ERR_PTR(ret);
David Woodhouse9ed437c2007-08-22 12:39:19 +0100449 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 ret = jffs2_do_new_inode (c, f, mode, ri);
451 if (ret) {
452 make_bad_inode(inode);
453 iput(inode);
454 return ERR_PTR(ret);
455 }
456 inode->i_nlink = 1;
457 inode->i_ino = je32_to_cpu(ri->ino);
458 inode->i_mode = jemode_to_cpu(ri->mode);
459 inode->i_gid = je16_to_cpu(ri->gid);
460 inode->i_uid = je16_to_cpu(ri->uid);
461 inode->i_atime = inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
462 ri->atime = ri->mtime = ri->ctime = cpu_to_je32(I_SEC(inode->i_mtime));
463
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 inode->i_blocks = 0;
465 inode->i_size = 0;
466
David Woodhousee72e6492010-06-03 08:09:12 +0100467 if (insert_inode_locked(inode) < 0) {
468 make_bad_inode(inode);
469 unlock_new_inode(inode);
470 iput(inode);
471 return ERR_PTR(-EINVAL);
472 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473
474 return inode;
475}
476
Daniel Drake65e5a0e2010-10-07 19:14:02 +0100477static int calculate_inocache_hashsize(uint32_t flash_size)
478{
479 /*
480 * Pick a inocache hash size based on the size of the medium.
481 * Count how many megabytes we're dealing with, apply a hashsize twice
482 * that size, but rounding down to the usual big powers of 2. And keep
483 * to sensible bounds.
484 */
485
486 int size_mb = flash_size / 1024 / 1024;
487 int hashsize = (size_mb * 2) & ~0x3f;
488
489 if (hashsize < INOCACHE_HASHSIZE_MIN)
490 return INOCACHE_HASHSIZE_MIN;
491 if (hashsize > INOCACHE_HASHSIZE_MAX)
492 return INOCACHE_HASHSIZE_MAX;
493
494 return hashsize;
495}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496
497int jffs2_do_fill_super(struct super_block *sb, void *data, int silent)
498{
499 struct jffs2_sb_info *c;
500 struct inode *root_i;
501 int ret;
502 size_t blocks;
503
504 c = JFFS2_SB_INFO(sb);
505
Andrew Victor2f82ce12005-02-09 09:24:26 +0000506#ifndef CONFIG_JFFS2_FS_WRITEBUFFER
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 if (c->mtd->type == MTD_NANDFLASH) {
508 printk(KERN_ERR "jffs2: Cannot operate on NAND flash unless jffs2 NAND support is compiled in.\n");
509 return -EINVAL;
510 }
Andrew Victor8f15fd52005-02-09 09:17:45 +0000511 if (c->mtd->type == MTD_DATAFLASH) {
512 printk(KERN_ERR "jffs2: Cannot operate on DataFlash unless jffs2 DataFlash support is compiled in.\n");
513 return -EINVAL;
514 }
515#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516
517 c->flash_size = c->mtd->size;
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000518 c->sector_size = c->mtd->erasesize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 blocks = c->flash_size / c->sector_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520
521 /*
522 * Size alignment check
523 */
524 if ((c->sector_size * blocks) != c->flash_size) {
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000525 c->flash_size = c->sector_size * blocks;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526 printk(KERN_INFO "jffs2: Flash size not aligned to erasesize, reducing to %dKiB\n",
527 c->flash_size / 1024);
528 }
529
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 if (c->flash_size < 5*c->sector_size) {
531 printk(KERN_ERR "jffs2: Too few erase blocks (%d)\n", c->flash_size / c->sector_size);
532 return -EINVAL;
533 }
534
535 c->cleanmarker_size = sizeof(struct jffs2_unknown_node);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536
537 /* NAND (or other bizarre) flash... do setup accordingly */
538 ret = jffs2_flash_setup(c);
539 if (ret)
540 return ret;
541
Daniel Drake65e5a0e2010-10-07 19:14:02 +0100542 c->inocache_hashsize = calculate_inocache_hashsize(c->flash_size);
543 c->inocache_list = kcalloc(c->inocache_hashsize, sizeof(struct jffs2_inode_cache *), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 if (!c->inocache_list) {
545 ret = -ENOMEM;
546 goto out_wbuf;
547 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900549 jffs2_init_xattr_subsystem(c);
550
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 if ((ret = jffs2_do_mount_fs(c)))
552 goto out_inohash;
553
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 D1(printk(KERN_DEBUG "jffs2_do_fill_super(): Getting root inode\n"));
David Howells5451f792008-02-07 00:15:42 -0800555 root_i = jffs2_iget(sb, 1);
556 if (IS_ERR(root_i)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 D1(printk(KERN_WARNING "get root inode failed\n"));
David Howells5451f792008-02-07 00:15:42 -0800558 ret = PTR_ERR(root_i);
559 goto out_root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 }
561
David Howells5451f792008-02-07 00:15:42 -0800562 ret = -ENOMEM;
563
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 D1(printk(KERN_DEBUG "jffs2_do_fill_super(): d_alloc_root()\n"));
565 sb->s_root = d_alloc_root(root_i);
566 if (!sb->s_root)
567 goto out_root_i;
568
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 sb->s_maxbytes = 0xFFFFFFFF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 sb->s_blocksize = PAGE_CACHE_SIZE;
571 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
572 sb->s_magic = JFFS2_SUPER_MAGIC;
573 if (!(sb->s_flags & MS_RDONLY))
574 jffs2_start_garbage_collect_thread(c);
575 return 0;
576
577 out_root_i:
578 iput(root_i);
David Howells5451f792008-02-07 00:15:42 -0800579out_root:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580 jffs2_free_ino_caches(c);
581 jffs2_free_raw_node_refs(c);
Ferenc Havasi4ce1f562005-08-31 14:51:04 +0100582 if (jffs2_blocks_use_vmalloc(c))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583 vfree(c->blocks);
584 else
585 kfree(c->blocks);
586 out_inohash:
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900587 jffs2_clear_xattr_subsystem(c);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 kfree(c->inocache_list);
589 out_wbuf:
590 jffs2_flash_cleanup(c);
591
592 return ret;
593}
594
595void jffs2_gc_release_inode(struct jffs2_sb_info *c,
596 struct jffs2_inode_info *f)
597{
598 iput(OFNI_EDONI_2SFFJ(f));
599}
600
601struct jffs2_inode_info *jffs2_gc_fetch_inode(struct jffs2_sb_info *c,
David Woodhouse1b690b42008-05-01 16:59:24 +0100602 int inum, int unlinked)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603{
604 struct inode *inode;
605 struct jffs2_inode_cache *ic;
David Woodhouse1b690b42008-05-01 16:59:24 +0100606
607 if (unlinked) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608 /* The inode has zero nlink but its nodes weren't yet marked
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000609 obsolete. This has to be because we're still waiting for
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 the final (close() and) iput() to happen.
611
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000612 There's a possibility that the final iput() could have
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613 happened while we were contemplating. In order to ensure
614 that we don't cause a new read_inode() (which would fail)
615 for the inode in question, we use ilookup() in this case
616 instead of iget().
617
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000618 The nlink can't _become_ zero at this point because we're
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619 holding the alloc_sem, and jffs2_do_unlink() would also
620 need that while decrementing nlink on any inode.
621 */
622 inode = ilookup(OFNI_BS_2SFFJ(c), inum);
623 if (!inode) {
624 D1(printk(KERN_DEBUG "ilookup() failed for ino #%u; inode is probably deleted.\n",
625 inum));
626
627 spin_lock(&c->inocache_lock);
628 ic = jffs2_get_ino_cache(c, inum);
629 if (!ic) {
630 D1(printk(KERN_DEBUG "Inode cache for ino #%u is gone.\n", inum));
631 spin_unlock(&c->inocache_lock);
632 return NULL;
633 }
634 if (ic->state != INO_STATE_CHECKEDABSENT) {
635 /* Wait for progress. Don't just loop */
636 D1(printk(KERN_DEBUG "Waiting for ino #%u in state %d\n",
637 ic->ino, ic->state));
638 sleep_on_spinunlock(&c->inocache_wq, &c->inocache_lock);
639 } else {
640 spin_unlock(&c->inocache_lock);
641 }
642
643 return NULL;
644 }
645 } else {
646 /* Inode has links to it still; they're not going away because
647 jffs2_do_unlink() would need the alloc_sem and we have it.
648 Just iget() it, and if read_inode() is necessary that's OK.
649 */
David Howells5451f792008-02-07 00:15:42 -0800650 inode = jffs2_iget(OFNI_BS_2SFFJ(c), inum);
651 if (IS_ERR(inode))
652 return ERR_CAST(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653 }
654 if (is_bad_inode(inode)) {
David Woodhouse1b690b42008-05-01 16:59:24 +0100655 printk(KERN_NOTICE "Eep. read_inode() failed for ino #%u. unlinked %d\n",
656 inum, unlinked);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 /* NB. This will happen again. We need to do something appropriate here. */
658 iput(inode);
659 return ERR_PTR(-EIO);
660 }
661
662 return JFFS2_INODE_INFO(inode);
663}
664
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000665unsigned char *jffs2_gc_fetch_page(struct jffs2_sb_info *c,
666 struct jffs2_inode_info *f,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 unsigned long offset,
668 unsigned long *priv)
669{
670 struct inode *inode = OFNI_EDONI_2SFFJ(f);
671 struct page *pg;
672
Jason Lunzfc0e0192007-09-01 12:06:03 -0700673 pg = read_cache_page_async(inode->i_mapping, offset >> PAGE_CACHE_SHIFT,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674 (void *)jffs2_do_readpage_unlock, inode);
675 if (IS_ERR(pg))
676 return (void *)pg;
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000677
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 *priv = (unsigned long)pg;
679 return kmap(pg);
680}
681
682void jffs2_gc_release_page(struct jffs2_sb_info *c,
683 unsigned char *ptr,
684 unsigned long *priv)
685{
686 struct page *pg = (void *)*priv;
687
688 kunmap(pg);
689 page_cache_release(pg);
690}
691
692static int jffs2_flash_setup(struct jffs2_sb_info *c) {
693 int ret = 0;
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000694
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695 if (jffs2_cleanmarker_oob(c)) {
696 /* NAND flash... do setup accordingly */
697 ret = jffs2_nand_flash_setup(c);
698 if (ret)
699 return ret;
700 }
701
Andrew Victor8f15fd52005-02-09 09:17:45 +0000702 /* and Dataflash */
703 if (jffs2_dataflash(c)) {
704 ret = jffs2_dataflash_setup(c);
705 if (ret)
706 return ret;
707 }
Nicolas Pitre59da7212005-08-06 05:51:33 +0100708
709 /* and Intel "Sibley" flash */
710 if (jffs2_nor_wbuf_flash(c)) {
711 ret = jffs2_nor_wbuf_flash_setup(c);
712 if (ret)
713 return ret;
714 }
715
Artem Bityutskiy0029da32006-10-04 19:15:21 +0300716 /* and an UBI volume */
717 if (jffs2_ubivol(c)) {
718 ret = jffs2_ubivol_setup(c);
719 if (ret)
720 return ret;
721 }
722
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723 return ret;
724}
725
726void jffs2_flash_cleanup(struct jffs2_sb_info *c) {
727
728 if (jffs2_cleanmarker_oob(c)) {
729 jffs2_nand_flash_cleanup(c);
730 }
731
Andrew Victor8f15fd52005-02-09 09:17:45 +0000732 /* and DataFlash */
733 if (jffs2_dataflash(c)) {
734 jffs2_dataflash_cleanup(c);
735 }
Nicolas Pitre59da7212005-08-06 05:51:33 +0100736
737 /* and Intel "Sibley" flash */
738 if (jffs2_nor_wbuf_flash(c)) {
739 jffs2_nor_wbuf_flash_cleanup(c);
740 }
Artem Bityutskiy0029da32006-10-04 19:15:21 +0300741
742 /* and an UBI volume */
743 if (jffs2_ubivol(c)) {
744 jffs2_ubivol_cleanup(c);
745 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746}