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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * JFFS2 -- Journalling Flash File System, Version 2. | |
3 | * | |
c00c310e | 4 | * Copyright © 2001-2007 Red Hat, Inc. |
1da177e4 LT |
5 | * |
6 | * Created by David Woodhouse <dwmw2@infradead.org> | |
7 | * | |
8 | * For licensing information, see the file 'LICENCE' in this directory. | |
9 | * | |
1da177e4 LT |
10 | */ |
11 | ||
1da177e4 | 12 | #include <linux/kernel.h> |
1da177e4 LT |
13 | #include <linux/fs.h> |
14 | #include <linux/time.h> | |
15 | #include <linux/pagemap.h> | |
16 | #include <linux/highmem.h> | |
17 | #include <linux/crc32.h> | |
18 | #include <linux/jffs2.h> | |
19 | #include "nodelist.h" | |
20 | ||
205c109a NP |
21 | static int jffs2_write_end(struct file *filp, struct address_space *mapping, |
22 | loff_t pos, unsigned len, unsigned copied, | |
23 | struct page *pg, void *fsdata); | |
24 | static int jffs2_write_begin(struct file *filp, struct address_space *mapping, | |
25 | loff_t pos, unsigned len, unsigned flags, | |
26 | struct page **pagep, void **fsdata); | |
1da177e4 LT |
27 | static int jffs2_readpage (struct file *filp, struct page *pg); |
28 | ||
29 | int jffs2_fsync(struct file *filp, struct dentry *dentry, int datasync) | |
30 | { | |
31 | struct inode *inode = dentry->d_inode; | |
32 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
33 | ||
34 | /* Trigger GC to flush any pending writes for this inode */ | |
35 | jffs2_flush_wbuf_gc(c, inode->i_ino); | |
182ec4ee TG |
36 | |
37 | return 0; | |
1da177e4 LT |
38 | } |
39 | ||
4b6f5d20 | 40 | const struct file_operations jffs2_file_operations = |
1da177e4 LT |
41 | { |
42 | .llseek = generic_file_llseek, | |
43 | .open = generic_file_open, | |
543ade1f BP |
44 | .read = do_sync_read, |
45 | .aio_read = generic_file_aio_read, | |
46 | .write = do_sync_write, | |
47 | .aio_write = generic_file_aio_write, | |
0533400b | 48 | .unlocked_ioctl=jffs2_ioctl, |
1da177e4 LT |
49 | .mmap = generic_file_readonly_mmap, |
50 | .fsync = jffs2_fsync, | |
5ffc4ef4 | 51 | .splice_read = generic_file_splice_read, |
1da177e4 LT |
52 | }; |
53 | ||
54 | /* jffs2_file_inode_operations */ | |
55 | ||
92e1d5be | 56 | const struct inode_operations jffs2_file_inode_operations = |
1da177e4 | 57 | { |
18f4c644 | 58 | .check_acl = jffs2_check_acl, |
aa98d7cf KK |
59 | .setattr = jffs2_setattr, |
60 | .setxattr = jffs2_setxattr, | |
61 | .getxattr = jffs2_getxattr, | |
62 | .listxattr = jffs2_listxattr, | |
63 | .removexattr = jffs2_removexattr | |
1da177e4 LT |
64 | }; |
65 | ||
f5e54d6e | 66 | const struct address_space_operations jffs2_file_address_operations = |
1da177e4 LT |
67 | { |
68 | .readpage = jffs2_readpage, | |
205c109a NP |
69 | .write_begin = jffs2_write_begin, |
70 | .write_end = jffs2_write_end, | |
1da177e4 LT |
71 | }; |
72 | ||
73 | static int jffs2_do_readpage_nolock (struct inode *inode, struct page *pg) | |
74 | { | |
75 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
76 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
77 | unsigned char *pg_buf; | |
78 | int ret; | |
79 | ||
80 | D2(printk(KERN_DEBUG "jffs2_do_readpage_nolock(): ino #%lu, page at offset 0x%lx\n", inode->i_ino, pg->index << PAGE_CACHE_SHIFT)); | |
81 | ||
cd7619d6 | 82 | BUG_ON(!PageLocked(pg)); |
1da177e4 LT |
83 | |
84 | pg_buf = kmap(pg); | |
85 | /* FIXME: Can kmap fail? */ | |
86 | ||
87 | ret = jffs2_read_inode_range(c, f, pg_buf, pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE); | |
88 | ||
89 | if (ret) { | |
90 | ClearPageUptodate(pg); | |
91 | SetPageError(pg); | |
92 | } else { | |
93 | SetPageUptodate(pg); | |
94 | ClearPageError(pg); | |
95 | } | |
96 | ||
97 | flush_dcache_page(pg); | |
98 | kunmap(pg); | |
99 | ||
100 | D2(printk(KERN_DEBUG "readpage finished\n")); | |
57ca7deb | 101 | return ret; |
1da177e4 LT |
102 | } |
103 | ||
104 | int jffs2_do_readpage_unlock(struct inode *inode, struct page *pg) | |
105 | { | |
106 | int ret = jffs2_do_readpage_nolock(inode, pg); | |
107 | unlock_page(pg); | |
108 | return ret; | |
109 | } | |
110 | ||
111 | ||
112 | static int jffs2_readpage (struct file *filp, struct page *pg) | |
113 | { | |
114 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(pg->mapping->host); | |
115 | int ret; | |
182ec4ee | 116 | |
ced22070 | 117 | mutex_lock(&f->sem); |
1da177e4 | 118 | ret = jffs2_do_readpage_unlock(pg->mapping->host, pg); |
ced22070 | 119 | mutex_unlock(&f->sem); |
1da177e4 LT |
120 | return ret; |
121 | } | |
122 | ||
205c109a NP |
123 | static int jffs2_write_begin(struct file *filp, struct address_space *mapping, |
124 | loff_t pos, unsigned len, unsigned flags, | |
125 | struct page **pagep, void **fsdata) | |
1da177e4 | 126 | { |
205c109a NP |
127 | struct page *pg; |
128 | struct inode *inode = mapping->host; | |
1da177e4 | 129 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); |
205c109a | 130 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
abe2f414 | 131 | uint32_t pageofs = index << PAGE_CACHE_SHIFT; |
1da177e4 LT |
132 | int ret = 0; |
133 | ||
54566b2c | 134 | pg = grab_cache_page_write_begin(mapping, index, flags); |
205c109a NP |
135 | if (!pg) |
136 | return -ENOMEM; | |
137 | *pagep = pg; | |
138 | ||
139 | D1(printk(KERN_DEBUG "jffs2_write_begin()\n")); | |
1da177e4 LT |
140 | |
141 | if (pageofs > inode->i_size) { | |
142 | /* Make new hole frag from old EOF to new page */ | |
143 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
144 | struct jffs2_raw_inode ri; | |
145 | struct jffs2_full_dnode *fn; | |
9fe4854c | 146 | uint32_t alloc_len; |
182ec4ee | 147 | |
1da177e4 LT |
148 | D1(printk(KERN_DEBUG "Writing new hole frag 0x%x-0x%x between current EOF and new page\n", |
149 | (unsigned int)inode->i_size, pageofs)); | |
150 | ||
9fe4854c DW |
151 | ret = jffs2_reserve_space(c, sizeof(ri), &alloc_len, |
152 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); | |
1da177e4 | 153 | if (ret) |
205c109a | 154 | goto out_page; |
1da177e4 | 155 | |
ced22070 | 156 | mutex_lock(&f->sem); |
1da177e4 LT |
157 | memset(&ri, 0, sizeof(ri)); |
158 | ||
159 | ri.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
160 | ri.nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); | |
161 | ri.totlen = cpu_to_je32(sizeof(ri)); | |
162 | ri.hdr_crc = cpu_to_je32(crc32(0, &ri, sizeof(struct jffs2_unknown_node)-4)); | |
163 | ||
164 | ri.ino = cpu_to_je32(f->inocache->ino); | |
165 | ri.version = cpu_to_je32(++f->highest_version); | |
166 | ri.mode = cpu_to_jemode(inode->i_mode); | |
167 | ri.uid = cpu_to_je16(inode->i_uid); | |
168 | ri.gid = cpu_to_je16(inode->i_gid); | |
169 | ri.isize = cpu_to_je32(max((uint32_t)inode->i_size, pageofs)); | |
170 | ri.atime = ri.ctime = ri.mtime = cpu_to_je32(get_seconds()); | |
171 | ri.offset = cpu_to_je32(inode->i_size); | |
172 | ri.dsize = cpu_to_je32(pageofs - inode->i_size); | |
173 | ri.csize = cpu_to_je32(0); | |
174 | ri.compr = JFFS2_COMPR_ZERO; | |
175 | ri.node_crc = cpu_to_je32(crc32(0, &ri, sizeof(ri)-8)); | |
176 | ri.data_crc = cpu_to_je32(0); | |
182ec4ee | 177 | |
9fe4854c | 178 | fn = jffs2_write_dnode(c, f, &ri, NULL, 0, ALLOC_NORMAL); |
1da177e4 LT |
179 | |
180 | if (IS_ERR(fn)) { | |
181 | ret = PTR_ERR(fn); | |
182 | jffs2_complete_reservation(c); | |
ced22070 | 183 | mutex_unlock(&f->sem); |
205c109a | 184 | goto out_page; |
1da177e4 LT |
185 | } |
186 | ret = jffs2_add_full_dnode_to_inode(c, f, fn); | |
187 | if (f->metadata) { | |
188 | jffs2_mark_node_obsolete(c, f->metadata->raw); | |
189 | jffs2_free_full_dnode(f->metadata); | |
190 | f->metadata = NULL; | |
191 | } | |
192 | if (ret) { | |
205c109a | 193 | D1(printk(KERN_DEBUG "Eep. add_full_dnode_to_inode() failed in write_begin, returned %d\n", ret)); |
1da177e4 LT |
194 | jffs2_mark_node_obsolete(c, fn->raw); |
195 | jffs2_free_full_dnode(fn); | |
196 | jffs2_complete_reservation(c); | |
ced22070 | 197 | mutex_unlock(&f->sem); |
205c109a | 198 | goto out_page; |
1da177e4 LT |
199 | } |
200 | jffs2_complete_reservation(c); | |
201 | inode->i_size = pageofs; | |
ced22070 | 202 | mutex_unlock(&f->sem); |
1da177e4 | 203 | } |
182ec4ee | 204 | |
205c109a NP |
205 | /* |
206 | * Read in the page if it wasn't already present. Cannot optimize away | |
207 | * the whole page write case until jffs2_write_end can handle the | |
208 | * case of a short-copy. | |
209 | */ | |
210 | if (!PageUptodate(pg)) { | |
ced22070 | 211 | mutex_lock(&f->sem); |
1da177e4 | 212 | ret = jffs2_do_readpage_nolock(inode, pg); |
ced22070 | 213 | mutex_unlock(&f->sem); |
205c109a NP |
214 | if (ret) |
215 | goto out_page; | |
1da177e4 | 216 | } |
205c109a NP |
217 | D1(printk(KERN_DEBUG "end write_begin(). pg->flags %lx\n", pg->flags)); |
218 | return ret; | |
219 | ||
220 | out_page: | |
221 | unlock_page(pg); | |
222 | page_cache_release(pg); | |
1da177e4 LT |
223 | return ret; |
224 | } | |
225 | ||
205c109a NP |
226 | static int jffs2_write_end(struct file *filp, struct address_space *mapping, |
227 | loff_t pos, unsigned len, unsigned copied, | |
228 | struct page *pg, void *fsdata) | |
1da177e4 LT |
229 | { |
230 | /* Actually commit the write from the page cache page we're looking at. | |
231 | * For now, we write the full page out each time. It sucks, but it's simple | |
232 | */ | |
205c109a | 233 | struct inode *inode = mapping->host; |
1da177e4 LT |
234 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); |
235 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
236 | struct jffs2_raw_inode *ri; | |
205c109a NP |
237 | unsigned start = pos & (PAGE_CACHE_SIZE - 1); |
238 | unsigned end = start + copied; | |
1da177e4 LT |
239 | unsigned aligned_start = start & ~3; |
240 | int ret = 0; | |
241 | uint32_t writtenlen = 0; | |
242 | ||
205c109a | 243 | D1(printk(KERN_DEBUG "jffs2_write_end(): ino #%lu, page at 0x%lx, range %d-%d, flags %lx\n", |
1da177e4 LT |
244 | inode->i_ino, pg->index << PAGE_CACHE_SHIFT, start, end, pg->flags)); |
245 | ||
205c109a NP |
246 | /* We need to avoid deadlock with page_cache_read() in |
247 | jffs2_garbage_collect_pass(). So the page must be | |
248 | up to date to prevent page_cache_read() from trying | |
249 | to re-lock it. */ | |
250 | BUG_ON(!PageUptodate(pg)); | |
251 | ||
cf5eba53 | 252 | if (end == PAGE_CACHE_SIZE) { |
205c109a NP |
253 | /* When writing out the end of a page, write out the |
254 | _whole_ page. This helps to reduce the number of | |
255 | nodes in files which have many short writes, like | |
256 | syslog files. */ | |
2a754b51 | 257 | aligned_start = 0; |
1da177e4 LT |
258 | } |
259 | ||
260 | ri = jffs2_alloc_raw_inode(); | |
261 | ||
262 | if (!ri) { | |
205c109a NP |
263 | D1(printk(KERN_DEBUG "jffs2_write_end(): Allocation of raw inode failed\n")); |
264 | unlock_page(pg); | |
265 | page_cache_release(pg); | |
1da177e4 LT |
266 | return -ENOMEM; |
267 | } | |
268 | ||
269 | /* Set the fields that the generic jffs2_write_inode_range() code can't find */ | |
270 | ri->ino = cpu_to_je32(inode->i_ino); | |
271 | ri->mode = cpu_to_jemode(inode->i_mode); | |
272 | ri->uid = cpu_to_je16(inode->i_uid); | |
273 | ri->gid = cpu_to_je16(inode->i_gid); | |
274 | ri->isize = cpu_to_je32((uint32_t)inode->i_size); | |
275 | ri->atime = ri->ctime = ri->mtime = cpu_to_je32(get_seconds()); | |
276 | ||
277 | /* In 2.4, it was already kmapped by generic_file_write(). Doesn't | |
278 | hurt to do it again. The alternative is ifdefs, which are ugly. */ | |
279 | kmap(pg); | |
280 | ||
281 | ret = jffs2_write_inode_range(c, f, ri, page_address(pg) + aligned_start, | |
282 | (pg->index << PAGE_CACHE_SHIFT) + aligned_start, | |
283 | end - aligned_start, &writtenlen); | |
284 | ||
285 | kunmap(pg); | |
286 | ||
287 | if (ret) { | |
288 | /* There was an error writing. */ | |
289 | SetPageError(pg); | |
290 | } | |
182ec4ee | 291 | |
1da177e4 | 292 | /* Adjust writtenlen for the padding we did, so we don't confuse our caller */ |
2a754b51 | 293 | writtenlen -= min(writtenlen, (start - aligned_start)); |
1da177e4 LT |
294 | |
295 | if (writtenlen) { | |
2a754b51 NP |
296 | if (inode->i_size < pos + writtenlen) { |
297 | inode->i_size = pos + writtenlen; | |
1da177e4 | 298 | inode->i_blocks = (inode->i_size + 511) >> 9; |
182ec4ee | 299 | |
1da177e4 LT |
300 | inode->i_ctime = inode->i_mtime = ITIME(je32_to_cpu(ri->ctime)); |
301 | } | |
302 | } | |
303 | ||
304 | jffs2_free_raw_inode(ri); | |
305 | ||
306 | if (start+writtenlen < end) { | |
307 | /* generic_file_write has written more to the page cache than we've | |
182ec4ee | 308 | actually written to the medium. Mark the page !Uptodate so that |
1da177e4 | 309 | it gets reread */ |
205c109a | 310 | D1(printk(KERN_DEBUG "jffs2_write_end(): Not all bytes written. Marking page !uptodate\n")); |
1da177e4 LT |
311 | SetPageError(pg); |
312 | ClearPageUptodate(pg); | |
313 | } | |
314 | ||
205c109a NP |
315 | D1(printk(KERN_DEBUG "jffs2_write_end() returning %d\n", |
316 | writtenlen > 0 ? writtenlen : ret)); | |
317 | unlock_page(pg); | |
318 | page_cache_release(pg); | |
319 | return writtenlen > 0 ? writtenlen : ret; | |
1da177e4 | 320 | } |