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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 AV |
54 | .read = new_sync_read, |
55 | .read_iter = generic_file_read_iter, | |
8174202b AV |
56 | .write = new_sync_write, |
57 | .write_iter = generic_file_write_iter, | |
0533400b | 58 | .unlocked_ioctl=jffs2_ioctl, |
1da177e4 LT |
59 | .mmap = generic_file_readonly_mmap, |
60 | .fsync = jffs2_fsync, | |
5ffc4ef4 | 61 | .splice_read = generic_file_splice_read, |
1da177e4 LT |
62 | }; |
63 | ||
64 | /* jffs2_file_inode_operations */ | |
65 | ||
92e1d5be | 66 | const struct inode_operations jffs2_file_inode_operations = |
1da177e4 | 67 | { |
4e34e719 | 68 | .get_acl = jffs2_get_acl, |
f2963d45 | 69 | .set_acl = jffs2_set_acl, |
aa98d7cf KK |
70 | .setattr = jffs2_setattr, |
71 | .setxattr = jffs2_setxattr, | |
72 | .getxattr = jffs2_getxattr, | |
73 | .listxattr = jffs2_listxattr, | |
74 | .removexattr = jffs2_removexattr | |
1da177e4 LT |
75 | }; |
76 | ||
f5e54d6e | 77 | const struct address_space_operations jffs2_file_address_operations = |
1da177e4 LT |
78 | { |
79 | .readpage = jffs2_readpage, | |
205c109a NP |
80 | .write_begin = jffs2_write_begin, |
81 | .write_end = jffs2_write_end, | |
1da177e4 LT |
82 | }; |
83 | ||
84 | static int jffs2_do_readpage_nolock (struct inode *inode, struct page *pg) | |
85 | { | |
86 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
87 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
88 | unsigned char *pg_buf; | |
89 | int ret; | |
90 | ||
9c261b33 JP |
91 | jffs2_dbg(2, "%s(): ino #%lu, page at offset 0x%lx\n", |
92 | __func__, inode->i_ino, pg->index << PAGE_CACHE_SHIFT); | |
1da177e4 | 93 | |
cd7619d6 | 94 | BUG_ON(!PageLocked(pg)); |
1da177e4 LT |
95 | |
96 | pg_buf = kmap(pg); | |
97 | /* FIXME: Can kmap fail? */ | |
98 | ||
99 | ret = jffs2_read_inode_range(c, f, pg_buf, pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE); | |
100 | ||
101 | if (ret) { | |
102 | ClearPageUptodate(pg); | |
103 | SetPageError(pg); | |
104 | } else { | |
105 | SetPageUptodate(pg); | |
106 | ClearPageError(pg); | |
107 | } | |
108 | ||
109 | flush_dcache_page(pg); | |
110 | kunmap(pg); | |
111 | ||
9c261b33 | 112 | jffs2_dbg(2, "readpage finished\n"); |
57ca7deb | 113 | return ret; |
1da177e4 LT |
114 | } |
115 | ||
116 | int jffs2_do_readpage_unlock(struct inode *inode, struct page *pg) | |
117 | { | |
118 | int ret = jffs2_do_readpage_nolock(inode, pg); | |
119 | unlock_page(pg); | |
120 | return ret; | |
121 | } | |
122 | ||
123 | ||
124 | static int jffs2_readpage (struct file *filp, struct page *pg) | |
125 | { | |
126 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(pg->mapping->host); | |
127 | int ret; | |
182ec4ee | 128 | |
ced22070 | 129 | mutex_lock(&f->sem); |
1da177e4 | 130 | ret = jffs2_do_readpage_unlock(pg->mapping->host, pg); |
ced22070 | 131 | mutex_unlock(&f->sem); |
1da177e4 LT |
132 | return ret; |
133 | } | |
134 | ||
205c109a NP |
135 | static int jffs2_write_begin(struct file *filp, struct address_space *mapping, |
136 | loff_t pos, unsigned len, unsigned flags, | |
137 | struct page **pagep, void **fsdata) | |
1da177e4 | 138 | { |
205c109a NP |
139 | struct page *pg; |
140 | struct inode *inode = mapping->host; | |
1da177e4 | 141 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); |
5ffd3412 TB |
142 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); |
143 | struct jffs2_raw_inode ri; | |
144 | uint32_t alloc_len = 0; | |
205c109a | 145 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
abe2f414 | 146 | uint32_t pageofs = index << PAGE_CACHE_SHIFT; |
1da177e4 LT |
147 | int ret = 0; |
148 | ||
5ffd3412 TB |
149 | jffs2_dbg(1, "%s()\n", __func__); |
150 | ||
151 | if (pageofs > inode->i_size) { | |
152 | ret = jffs2_reserve_space(c, sizeof(ri), &alloc_len, | |
153 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); | |
154 | if (ret) | |
155 | return ret; | |
156 | } | |
157 | ||
158 | mutex_lock(&f->sem); | |
54566b2c | 159 | pg = grab_cache_page_write_begin(mapping, index, flags); |
5ffd3412 TB |
160 | if (!pg) { |
161 | if (alloc_len) | |
162 | jffs2_complete_reservation(c); | |
163 | mutex_unlock(&f->sem); | |
205c109a | 164 | return -ENOMEM; |
5ffd3412 | 165 | } |
205c109a NP |
166 | *pagep = pg; |
167 | ||
5ffd3412 | 168 | if (alloc_len) { |
1da177e4 | 169 | /* Make new hole frag from old EOF to new page */ |
1da177e4 | 170 | struct jffs2_full_dnode *fn; |
182ec4ee | 171 | |
9c261b33 JP |
172 | jffs2_dbg(1, "Writing new hole frag 0x%x-0x%x between current EOF and new page\n", |
173 | (unsigned int)inode->i_size, pageofs); | |
1da177e4 | 174 | |
1da177e4 LT |
175 | memset(&ri, 0, sizeof(ri)); |
176 | ||
177 | ri.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
178 | ri.nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); | |
179 | ri.totlen = cpu_to_je32(sizeof(ri)); | |
180 | ri.hdr_crc = cpu_to_je32(crc32(0, &ri, sizeof(struct jffs2_unknown_node)-4)); | |
181 | ||
182 | ri.ino = cpu_to_je32(f->inocache->ino); | |
183 | ri.version = cpu_to_je32(++f->highest_version); | |
184 | ri.mode = cpu_to_jemode(inode->i_mode); | |
0cfe53d3 EB |
185 | ri.uid = cpu_to_je16(i_uid_read(inode)); |
186 | ri.gid = cpu_to_je16(i_gid_read(inode)); | |
1da177e4 LT |
187 | ri.isize = cpu_to_je32(max((uint32_t)inode->i_size, pageofs)); |
188 | ri.atime = ri.ctime = ri.mtime = cpu_to_je32(get_seconds()); | |
189 | ri.offset = cpu_to_je32(inode->i_size); | |
190 | ri.dsize = cpu_to_je32(pageofs - inode->i_size); | |
191 | ri.csize = cpu_to_je32(0); | |
192 | ri.compr = JFFS2_COMPR_ZERO; | |
193 | ri.node_crc = cpu_to_je32(crc32(0, &ri, sizeof(ri)-8)); | |
194 | ri.data_crc = cpu_to_je32(0); | |
182ec4ee | 195 | |
9fe4854c | 196 | fn = jffs2_write_dnode(c, f, &ri, NULL, 0, ALLOC_NORMAL); |
1da177e4 LT |
197 | |
198 | if (IS_ERR(fn)) { | |
199 | ret = PTR_ERR(fn); | |
200 | jffs2_complete_reservation(c); | |
205c109a | 201 | goto out_page; |
1da177e4 LT |
202 | } |
203 | ret = jffs2_add_full_dnode_to_inode(c, f, fn); | |
204 | if (f->metadata) { | |
205 | jffs2_mark_node_obsolete(c, f->metadata->raw); | |
206 | jffs2_free_full_dnode(f->metadata); | |
207 | f->metadata = NULL; | |
208 | } | |
209 | if (ret) { | |
9c261b33 JP |
210 | jffs2_dbg(1, "Eep. add_full_dnode_to_inode() failed in write_begin, returned %d\n", |
211 | ret); | |
1da177e4 LT |
212 | jffs2_mark_node_obsolete(c, fn->raw); |
213 | jffs2_free_full_dnode(fn); | |
214 | jffs2_complete_reservation(c); | |
205c109a | 215 | goto out_page; |
1da177e4 LT |
216 | } |
217 | jffs2_complete_reservation(c); | |
218 | inode->i_size = pageofs; | |
1da177e4 | 219 | } |
182ec4ee | 220 | |
205c109a NP |
221 | /* |
222 | * Read in the page if it wasn't already present. Cannot optimize away | |
223 | * the whole page write case until jffs2_write_end can handle the | |
224 | * case of a short-copy. | |
225 | */ | |
226 | if (!PageUptodate(pg)) { | |
1da177e4 | 227 | ret = jffs2_do_readpage_nolock(inode, pg); |
205c109a NP |
228 | if (ret) |
229 | goto out_page; | |
1da177e4 | 230 | } |
5ffd3412 | 231 | mutex_unlock(&f->sem); |
9c261b33 | 232 | jffs2_dbg(1, "end write_begin(). pg->flags %lx\n", pg->flags); |
205c109a NP |
233 | return ret; |
234 | ||
235 | out_page: | |
236 | unlock_page(pg); | |
237 | page_cache_release(pg); | |
5ffd3412 | 238 | mutex_unlock(&f->sem); |
1da177e4 LT |
239 | return ret; |
240 | } | |
241 | ||
205c109a NP |
242 | static int jffs2_write_end(struct file *filp, struct address_space *mapping, |
243 | loff_t pos, unsigned len, unsigned copied, | |
244 | struct page *pg, void *fsdata) | |
1da177e4 LT |
245 | { |
246 | /* Actually commit the write from the page cache page we're looking at. | |
247 | * For now, we write the full page out each time. It sucks, but it's simple | |
248 | */ | |
205c109a | 249 | struct inode *inode = mapping->host; |
1da177e4 LT |
250 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); |
251 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
252 | struct jffs2_raw_inode *ri; | |
205c109a NP |
253 | unsigned start = pos & (PAGE_CACHE_SIZE - 1); |
254 | unsigned end = start + copied; | |
1da177e4 LT |
255 | unsigned aligned_start = start & ~3; |
256 | int ret = 0; | |
257 | uint32_t writtenlen = 0; | |
258 | ||
9c261b33 JP |
259 | jffs2_dbg(1, "%s(): ino #%lu, page at 0x%lx, range %d-%d, flags %lx\n", |
260 | __func__, inode->i_ino, pg->index << PAGE_CACHE_SHIFT, | |
261 | start, end, pg->flags); | |
1da177e4 | 262 | |
205c109a NP |
263 | /* We need to avoid deadlock with page_cache_read() in |
264 | jffs2_garbage_collect_pass(). So the page must be | |
265 | up to date to prevent page_cache_read() from trying | |
266 | to re-lock it. */ | |
267 | BUG_ON(!PageUptodate(pg)); | |
268 | ||
cf5eba53 | 269 | if (end == PAGE_CACHE_SIZE) { |
205c109a NP |
270 | /* When writing out the end of a page, write out the |
271 | _whole_ page. This helps to reduce the number of | |
272 | nodes in files which have many short writes, like | |
273 | syslog files. */ | |
2a754b51 | 274 | aligned_start = 0; |
1da177e4 LT |
275 | } |
276 | ||
277 | ri = jffs2_alloc_raw_inode(); | |
278 | ||
279 | if (!ri) { | |
9c261b33 JP |
280 | jffs2_dbg(1, "%s(): Allocation of raw inode failed\n", |
281 | __func__); | |
205c109a NP |
282 | unlock_page(pg); |
283 | page_cache_release(pg); | |
1da177e4 LT |
284 | return -ENOMEM; |
285 | } | |
286 | ||
287 | /* Set the fields that the generic jffs2_write_inode_range() code can't find */ | |
288 | ri->ino = cpu_to_je32(inode->i_ino); | |
289 | ri->mode = cpu_to_jemode(inode->i_mode); | |
0cfe53d3 EB |
290 | ri->uid = cpu_to_je16(i_uid_read(inode)); |
291 | ri->gid = cpu_to_je16(i_gid_read(inode)); | |
1da177e4 LT |
292 | ri->isize = cpu_to_je32((uint32_t)inode->i_size); |
293 | ri->atime = ri->ctime = ri->mtime = cpu_to_je32(get_seconds()); | |
294 | ||
295 | /* In 2.4, it was already kmapped by generic_file_write(). Doesn't | |
296 | hurt to do it again. The alternative is ifdefs, which are ugly. */ | |
297 | kmap(pg); | |
298 | ||
299 | ret = jffs2_write_inode_range(c, f, ri, page_address(pg) + aligned_start, | |
300 | (pg->index << PAGE_CACHE_SHIFT) + aligned_start, | |
301 | end - aligned_start, &writtenlen); | |
302 | ||
303 | kunmap(pg); | |
304 | ||
305 | if (ret) { | |
306 | /* There was an error writing. */ | |
307 | SetPageError(pg); | |
308 | } | |
182ec4ee | 309 | |
1da177e4 | 310 | /* Adjust writtenlen for the padding we did, so we don't confuse our caller */ |
2a754b51 | 311 | writtenlen -= min(writtenlen, (start - aligned_start)); |
1da177e4 LT |
312 | |
313 | if (writtenlen) { | |
2a754b51 NP |
314 | if (inode->i_size < pos + writtenlen) { |
315 | inode->i_size = pos + writtenlen; | |
1da177e4 | 316 | inode->i_blocks = (inode->i_size + 511) >> 9; |
182ec4ee | 317 | |
1da177e4 LT |
318 | inode->i_ctime = inode->i_mtime = ITIME(je32_to_cpu(ri->ctime)); |
319 | } | |
320 | } | |
321 | ||
322 | jffs2_free_raw_inode(ri); | |
323 | ||
324 | if (start+writtenlen < end) { | |
325 | /* generic_file_write has written more to the page cache than we've | |
182ec4ee | 326 | actually written to the medium. Mark the page !Uptodate so that |
1da177e4 | 327 | it gets reread */ |
9c261b33 JP |
328 | jffs2_dbg(1, "%s(): Not all bytes written. Marking page !uptodate\n", |
329 | __func__); | |
1da177e4 LT |
330 | SetPageError(pg); |
331 | ClearPageUptodate(pg); | |
332 | } | |
333 | ||
9c261b33 JP |
334 | jffs2_dbg(1, "%s() returning %d\n", |
335 | __func__, writtenlen > 0 ? writtenlen : ret); | |
205c109a NP |
336 | unlock_page(pg); |
337 | page_cache_release(pg); | |
338 | return writtenlen > 0 ? writtenlen : ret; | |
1da177e4 | 339 | } |