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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. |
6088c058 | 5 | * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org> |
1da177e4 LT |
6 | * |
7 | * Created by David Woodhouse <dwmw2@infradead.org> | |
8 | * | |
9 | * For licensing information, see the file 'LICENCE' in this directory. | |
10 | * | |
1da177e4 LT |
11 | */ |
12 | ||
5a528957 JP |
13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
14 | ||
1da177e4 | 15 | #include <linux/kernel.h> |
1da177e4 LT |
16 | #include <linux/fs.h> |
17 | #include <linux/time.h> | |
18 | #include <linux/pagemap.h> | |
19 | #include <linux/highmem.h> | |
20 | #include <linux/crc32.h> | |
21 | #include <linux/jffs2.h> | |
22 | #include "nodelist.h" | |
23 | ||
205c109a NP |
24 | static int jffs2_write_end(struct file *filp, struct address_space *mapping, |
25 | loff_t pos, unsigned len, unsigned copied, | |
26 | struct page *pg, void *fsdata); | |
27 | static int jffs2_write_begin(struct file *filp, struct address_space *mapping, | |
28 | loff_t pos, unsigned len, unsigned flags, | |
29 | struct page **pagep, void **fsdata); | |
1da177e4 LT |
30 | static int jffs2_readpage (struct file *filp, struct page *pg); |
31 | ||
02c24a82 | 32 | int jffs2_fsync(struct file *filp, loff_t start, loff_t end, int datasync) |
1da177e4 | 33 | { |
7ea80859 | 34 | struct inode *inode = filp->f_mapping->host; |
1da177e4 | 35 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); |
02c24a82 | 36 | int ret; |
1da177e4 | 37 | |
02c24a82 JB |
38 | ret = filemap_write_and_wait_range(inode->i_mapping, start, end); |
39 | if (ret) | |
40 | return ret; | |
41 | ||
42 | mutex_lock(&inode->i_mutex); | |
1da177e4 LT |
43 | /* Trigger GC to flush any pending writes for this inode */ |
44 | jffs2_flush_wbuf_gc(c, inode->i_ino); | |
02c24a82 | 45 | mutex_unlock(&inode->i_mutex); |
182ec4ee TG |
46 | |
47 | return 0; | |
1da177e4 LT |
48 | } |
49 | ||
4b6f5d20 | 50 | const struct file_operations jffs2_file_operations = |
1da177e4 LT |
51 | { |
52 | .llseek = generic_file_llseek, | |
53 | .open = generic_file_open, | |
aad4f8bb | 54 | .read_iter = generic_file_read_iter, |
8174202b | 55 | .write_iter = generic_file_write_iter, |
0533400b | 56 | .unlocked_ioctl=jffs2_ioctl, |
1da177e4 LT |
57 | .mmap = generic_file_readonly_mmap, |
58 | .fsync = jffs2_fsync, | |
5ffc4ef4 | 59 | .splice_read = generic_file_splice_read, |
1da177e4 LT |
60 | }; |
61 | ||
62 | /* jffs2_file_inode_operations */ | |
63 | ||
92e1d5be | 64 | const struct inode_operations jffs2_file_inode_operations = |
1da177e4 | 65 | { |
4e34e719 | 66 | .get_acl = jffs2_get_acl, |
f2963d45 | 67 | .set_acl = jffs2_set_acl, |
aa98d7cf KK |
68 | .setattr = jffs2_setattr, |
69 | .setxattr = jffs2_setxattr, | |
70 | .getxattr = jffs2_getxattr, | |
71 | .listxattr = jffs2_listxattr, | |
72 | .removexattr = jffs2_removexattr | |
1da177e4 LT |
73 | }; |
74 | ||
f5e54d6e | 75 | const struct address_space_operations jffs2_file_address_operations = |
1da177e4 LT |
76 | { |
77 | .readpage = jffs2_readpage, | |
205c109a NP |
78 | .write_begin = jffs2_write_begin, |
79 | .write_end = jffs2_write_end, | |
1da177e4 LT |
80 | }; |
81 | ||
82 | static int jffs2_do_readpage_nolock (struct inode *inode, struct page *pg) | |
83 | { | |
84 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
85 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
86 | unsigned char *pg_buf; | |
87 | int ret; | |
88 | ||
9c261b33 JP |
89 | jffs2_dbg(2, "%s(): ino #%lu, page at offset 0x%lx\n", |
90 | __func__, inode->i_ino, pg->index << PAGE_CACHE_SHIFT); | |
1da177e4 | 91 | |
cd7619d6 | 92 | BUG_ON(!PageLocked(pg)); |
1da177e4 LT |
93 | |
94 | pg_buf = kmap(pg); | |
95 | /* FIXME: Can kmap fail? */ | |
96 | ||
97 | ret = jffs2_read_inode_range(c, f, pg_buf, pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE); | |
98 | ||
99 | if (ret) { | |
100 | ClearPageUptodate(pg); | |
101 | SetPageError(pg); | |
102 | } else { | |
103 | SetPageUptodate(pg); | |
104 | ClearPageError(pg); | |
105 | } | |
106 | ||
107 | flush_dcache_page(pg); | |
108 | kunmap(pg); | |
109 | ||
9c261b33 | 110 | jffs2_dbg(2, "readpage finished\n"); |
57ca7deb | 111 | return ret; |
1da177e4 LT |
112 | } |
113 | ||
114 | int jffs2_do_readpage_unlock(struct inode *inode, struct page *pg) | |
115 | { | |
116 | int ret = jffs2_do_readpage_nolock(inode, pg); | |
117 | unlock_page(pg); | |
118 | return ret; | |
119 | } | |
120 | ||
121 | ||
122 | static int jffs2_readpage (struct file *filp, struct page *pg) | |
123 | { | |
124 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(pg->mapping->host); | |
125 | int ret; | |
182ec4ee | 126 | |
ced22070 | 127 | mutex_lock(&f->sem); |
1da177e4 | 128 | ret = jffs2_do_readpage_unlock(pg->mapping->host, pg); |
ced22070 | 129 | mutex_unlock(&f->sem); |
1da177e4 LT |
130 | return ret; |
131 | } | |
132 | ||
205c109a NP |
133 | static int jffs2_write_begin(struct file *filp, struct address_space *mapping, |
134 | loff_t pos, unsigned len, unsigned flags, | |
135 | struct page **pagep, void **fsdata) | |
1da177e4 | 136 | { |
205c109a NP |
137 | struct page *pg; |
138 | struct inode *inode = mapping->host; | |
1da177e4 | 139 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); |
5ffd3412 TB |
140 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); |
141 | struct jffs2_raw_inode ri; | |
142 | uint32_t alloc_len = 0; | |
205c109a | 143 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
abe2f414 | 144 | uint32_t pageofs = index << PAGE_CACHE_SHIFT; |
1da177e4 LT |
145 | int ret = 0; |
146 | ||
5ffd3412 TB |
147 | jffs2_dbg(1, "%s()\n", __func__); |
148 | ||
149 | if (pageofs > inode->i_size) { | |
150 | ret = jffs2_reserve_space(c, sizeof(ri), &alloc_len, | |
151 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); | |
152 | if (ret) | |
153 | return ret; | |
154 | } | |
155 | ||
156 | mutex_lock(&f->sem); | |
54566b2c | 157 | pg = grab_cache_page_write_begin(mapping, index, flags); |
5ffd3412 TB |
158 | if (!pg) { |
159 | if (alloc_len) | |
160 | jffs2_complete_reservation(c); | |
161 | mutex_unlock(&f->sem); | |
205c109a | 162 | return -ENOMEM; |
5ffd3412 | 163 | } |
205c109a NP |
164 | *pagep = pg; |
165 | ||
5ffd3412 | 166 | if (alloc_len) { |
1da177e4 | 167 | /* Make new hole frag from old EOF to new page */ |
1da177e4 | 168 | struct jffs2_full_dnode *fn; |
182ec4ee | 169 | |
9c261b33 JP |
170 | jffs2_dbg(1, "Writing new hole frag 0x%x-0x%x between current EOF and new page\n", |
171 | (unsigned int)inode->i_size, pageofs); | |
1da177e4 | 172 | |
1da177e4 LT |
173 | memset(&ri, 0, sizeof(ri)); |
174 | ||
175 | ri.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
176 | ri.nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); | |
177 | ri.totlen = cpu_to_je32(sizeof(ri)); | |
178 | ri.hdr_crc = cpu_to_je32(crc32(0, &ri, sizeof(struct jffs2_unknown_node)-4)); | |
179 | ||
180 | ri.ino = cpu_to_je32(f->inocache->ino); | |
181 | ri.version = cpu_to_je32(++f->highest_version); | |
182 | ri.mode = cpu_to_jemode(inode->i_mode); | |
0cfe53d3 EB |
183 | ri.uid = cpu_to_je16(i_uid_read(inode)); |
184 | ri.gid = cpu_to_je16(i_gid_read(inode)); | |
1da177e4 LT |
185 | ri.isize = cpu_to_je32(max((uint32_t)inode->i_size, pageofs)); |
186 | ri.atime = ri.ctime = ri.mtime = cpu_to_je32(get_seconds()); | |
187 | ri.offset = cpu_to_je32(inode->i_size); | |
188 | ri.dsize = cpu_to_je32(pageofs - inode->i_size); | |
189 | ri.csize = cpu_to_je32(0); | |
190 | ri.compr = JFFS2_COMPR_ZERO; | |
191 | ri.node_crc = cpu_to_je32(crc32(0, &ri, sizeof(ri)-8)); | |
192 | ri.data_crc = cpu_to_je32(0); | |
182ec4ee | 193 | |
9fe4854c | 194 | fn = jffs2_write_dnode(c, f, &ri, NULL, 0, ALLOC_NORMAL); |
1da177e4 LT |
195 | |
196 | if (IS_ERR(fn)) { | |
197 | ret = PTR_ERR(fn); | |
198 | jffs2_complete_reservation(c); | |
205c109a | 199 | goto out_page; |
1da177e4 LT |
200 | } |
201 | ret = jffs2_add_full_dnode_to_inode(c, f, fn); | |
202 | if (f->metadata) { | |
203 | jffs2_mark_node_obsolete(c, f->metadata->raw); | |
204 | jffs2_free_full_dnode(f->metadata); | |
205 | f->metadata = NULL; | |
206 | } | |
207 | if (ret) { | |
9c261b33 JP |
208 | jffs2_dbg(1, "Eep. add_full_dnode_to_inode() failed in write_begin, returned %d\n", |
209 | ret); | |
1da177e4 LT |
210 | jffs2_mark_node_obsolete(c, fn->raw); |
211 | jffs2_free_full_dnode(fn); | |
212 | jffs2_complete_reservation(c); | |
205c109a | 213 | goto out_page; |
1da177e4 LT |
214 | } |
215 | jffs2_complete_reservation(c); | |
216 | inode->i_size = pageofs; | |
1da177e4 | 217 | } |
182ec4ee | 218 | |
205c109a NP |
219 | /* |
220 | * Read in the page if it wasn't already present. Cannot optimize away | |
221 | * the whole page write case until jffs2_write_end can handle the | |
222 | * case of a short-copy. | |
223 | */ | |
224 | if (!PageUptodate(pg)) { | |
1da177e4 | 225 | ret = jffs2_do_readpage_nolock(inode, pg); |
205c109a NP |
226 | if (ret) |
227 | goto out_page; | |
1da177e4 | 228 | } |
5ffd3412 | 229 | mutex_unlock(&f->sem); |
9c261b33 | 230 | jffs2_dbg(1, "end write_begin(). pg->flags %lx\n", pg->flags); |
205c109a NP |
231 | return ret; |
232 | ||
233 | out_page: | |
234 | unlock_page(pg); | |
235 | page_cache_release(pg); | |
5ffd3412 | 236 | mutex_unlock(&f->sem); |
1da177e4 LT |
237 | return ret; |
238 | } | |
239 | ||
205c109a NP |
240 | static int jffs2_write_end(struct file *filp, struct address_space *mapping, |
241 | loff_t pos, unsigned len, unsigned copied, | |
242 | struct page *pg, void *fsdata) | |
1da177e4 LT |
243 | { |
244 | /* Actually commit the write from the page cache page we're looking at. | |
245 | * For now, we write the full page out each time. It sucks, but it's simple | |
246 | */ | |
205c109a | 247 | struct inode *inode = mapping->host; |
1da177e4 LT |
248 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); |
249 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
250 | struct jffs2_raw_inode *ri; | |
205c109a NP |
251 | unsigned start = pos & (PAGE_CACHE_SIZE - 1); |
252 | unsigned end = start + copied; | |
1da177e4 LT |
253 | unsigned aligned_start = start & ~3; |
254 | int ret = 0; | |
255 | uint32_t writtenlen = 0; | |
256 | ||
9c261b33 JP |
257 | jffs2_dbg(1, "%s(): ino #%lu, page at 0x%lx, range %d-%d, flags %lx\n", |
258 | __func__, inode->i_ino, pg->index << PAGE_CACHE_SHIFT, | |
259 | start, end, pg->flags); | |
1da177e4 | 260 | |
205c109a NP |
261 | /* We need to avoid deadlock with page_cache_read() in |
262 | jffs2_garbage_collect_pass(). So the page must be | |
263 | up to date to prevent page_cache_read() from trying | |
264 | to re-lock it. */ | |
265 | BUG_ON(!PageUptodate(pg)); | |
266 | ||
cf5eba53 | 267 | if (end == PAGE_CACHE_SIZE) { |
205c109a NP |
268 | /* When writing out the end of a page, write out the |
269 | _whole_ page. This helps to reduce the number of | |
270 | nodes in files which have many short writes, like | |
271 | syslog files. */ | |
2a754b51 | 272 | aligned_start = 0; |
1da177e4 LT |
273 | } |
274 | ||
275 | ri = jffs2_alloc_raw_inode(); | |
276 | ||
277 | if (!ri) { | |
9c261b33 JP |
278 | jffs2_dbg(1, "%s(): Allocation of raw inode failed\n", |
279 | __func__); | |
205c109a NP |
280 | unlock_page(pg); |
281 | page_cache_release(pg); | |
1da177e4 LT |
282 | return -ENOMEM; |
283 | } | |
284 | ||
285 | /* Set the fields that the generic jffs2_write_inode_range() code can't find */ | |
286 | ri->ino = cpu_to_je32(inode->i_ino); | |
287 | ri->mode = cpu_to_jemode(inode->i_mode); | |
0cfe53d3 EB |
288 | ri->uid = cpu_to_je16(i_uid_read(inode)); |
289 | ri->gid = cpu_to_je16(i_gid_read(inode)); | |
1da177e4 LT |
290 | ri->isize = cpu_to_je32((uint32_t)inode->i_size); |
291 | ri->atime = ri->ctime = ri->mtime = cpu_to_je32(get_seconds()); | |
292 | ||
293 | /* In 2.4, it was already kmapped by generic_file_write(). Doesn't | |
294 | hurt to do it again. The alternative is ifdefs, which are ugly. */ | |
295 | kmap(pg); | |
296 | ||
297 | ret = jffs2_write_inode_range(c, f, ri, page_address(pg) + aligned_start, | |
298 | (pg->index << PAGE_CACHE_SHIFT) + aligned_start, | |
299 | end - aligned_start, &writtenlen); | |
300 | ||
301 | kunmap(pg); | |
302 | ||
303 | if (ret) { | |
304 | /* There was an error writing. */ | |
305 | SetPageError(pg); | |
306 | } | |
182ec4ee | 307 | |
1da177e4 | 308 | /* Adjust writtenlen for the padding we did, so we don't confuse our caller */ |
2a754b51 | 309 | writtenlen -= min(writtenlen, (start - aligned_start)); |
1da177e4 LT |
310 | |
311 | if (writtenlen) { | |
2a754b51 NP |
312 | if (inode->i_size < pos + writtenlen) { |
313 | inode->i_size = pos + writtenlen; | |
1da177e4 | 314 | inode->i_blocks = (inode->i_size + 511) >> 9; |
182ec4ee | 315 | |
1da177e4 LT |
316 | inode->i_ctime = inode->i_mtime = ITIME(je32_to_cpu(ri->ctime)); |
317 | } | |
318 | } | |
319 | ||
320 | jffs2_free_raw_inode(ri); | |
321 | ||
322 | if (start+writtenlen < end) { | |
323 | /* generic_file_write has written more to the page cache than we've | |
182ec4ee | 324 | actually written to the medium. Mark the page !Uptodate so that |
1da177e4 | 325 | it gets reread */ |
9c261b33 JP |
326 | jffs2_dbg(1, "%s(): Not all bytes written. Marking page !uptodate\n", |
327 | __func__); | |
1da177e4 LT |
328 | SetPageError(pg); |
329 | ClearPageUptodate(pg); | |
330 | } | |
331 | ||
9c261b33 JP |
332 | jffs2_dbg(1, "%s() returning %d\n", |
333 | __func__, writtenlen > 0 ? writtenlen : ret); | |
205c109a NP |
334 | unlock_page(pg); |
335 | page_cache_release(pg); | |
336 | return writtenlen > 0 ? writtenlen : ret; | |
1da177e4 | 337 | } |