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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 | |
3b49c9a1 | 38 | ret = file_write_and_wait_range(filp, start, end); |
02c24a82 JB |
39 | if (ret) |
40 | return ret; | |
41 | ||
5955102c | 42 | inode_lock(inode); |
1da177e4 LT |
43 | /* Trigger GC to flush any pending writes for this inode */ |
44 | jffs2_flush_wbuf_gc(c, inode->i_ino); | |
5955102c | 45 | inode_unlock(inode); |
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, |
42984af0 | 60 | .splice_write = iter_file_splice_write, |
1da177e4 LT |
61 | }; |
62 | ||
63 | /* jffs2_file_inode_operations */ | |
64 | ||
92e1d5be | 65 | const struct inode_operations jffs2_file_inode_operations = |
1da177e4 | 66 | { |
4e34e719 | 67 | .get_acl = jffs2_get_acl, |
f2963d45 | 68 | .set_acl = jffs2_set_acl, |
aa98d7cf | 69 | .setattr = jffs2_setattr, |
aa98d7cf | 70 | .listxattr = jffs2_listxattr, |
1da177e4 LT |
71 | }; |
72 | ||
f5e54d6e | 73 | const struct address_space_operations jffs2_file_address_operations = |
1da177e4 LT |
74 | { |
75 | .readpage = jffs2_readpage, | |
205c109a NP |
76 | .write_begin = jffs2_write_begin, |
77 | .write_end = jffs2_write_end, | |
1da177e4 LT |
78 | }; |
79 | ||
80 | static int jffs2_do_readpage_nolock (struct inode *inode, struct page *pg) | |
81 | { | |
82 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
83 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
84 | unsigned char *pg_buf; | |
85 | int ret; | |
86 | ||
9c261b33 | 87 | jffs2_dbg(2, "%s(): ino #%lu, page at offset 0x%lx\n", |
09cbfeaf | 88 | __func__, inode->i_ino, pg->index << PAGE_SHIFT); |
1da177e4 | 89 | |
cd7619d6 | 90 | BUG_ON(!PageLocked(pg)); |
1da177e4 LT |
91 | |
92 | pg_buf = kmap(pg); | |
93 | /* FIXME: Can kmap fail? */ | |
94 | ||
09cbfeaf KS |
95 | ret = jffs2_read_inode_range(c, f, pg_buf, pg->index << PAGE_SHIFT, |
96 | PAGE_SIZE); | |
1da177e4 LT |
97 | |
98 | if (ret) { | |
99 | ClearPageUptodate(pg); | |
100 | SetPageError(pg); | |
101 | } else { | |
102 | SetPageUptodate(pg); | |
103 | ClearPageError(pg); | |
104 | } | |
105 | ||
106 | flush_dcache_page(pg); | |
107 | kunmap(pg); | |
108 | ||
9c261b33 | 109 | jffs2_dbg(2, "readpage finished\n"); |
57ca7deb | 110 | return ret; |
1da177e4 LT |
111 | } |
112 | ||
265de8ce | 113 | int jffs2_do_readpage_unlock(void *data, struct page *pg) |
1da177e4 | 114 | { |
265de8ce | 115 | int ret = jffs2_do_readpage_nolock(data, pg); |
1da177e4 LT |
116 | unlock_page(pg); |
117 | return ret; | |
118 | } | |
119 | ||
120 | ||
121 | static int jffs2_readpage (struct file *filp, struct page *pg) | |
122 | { | |
123 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(pg->mapping->host); | |
124 | int ret; | |
182ec4ee | 125 | |
ced22070 | 126 | mutex_lock(&f->sem); |
1da177e4 | 127 | ret = jffs2_do_readpage_unlock(pg->mapping->host, pg); |
ced22070 | 128 | mutex_unlock(&f->sem); |
1da177e4 LT |
129 | return ret; |
130 | } | |
131 | ||
205c109a NP |
132 | static int jffs2_write_begin(struct file *filp, struct address_space *mapping, |
133 | loff_t pos, unsigned len, unsigned flags, | |
134 | struct page **pagep, void **fsdata) | |
1da177e4 | 135 | { |
205c109a NP |
136 | struct page *pg; |
137 | struct inode *inode = mapping->host; | |
1da177e4 | 138 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); |
cec6502b | 139 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); |
09cbfeaf KS |
140 | pgoff_t index = pos >> PAGE_SHIFT; |
141 | uint32_t pageofs = index << PAGE_SHIFT; | |
1da177e4 LT |
142 | int ret = 0; |
143 | ||
157078f6 TB |
144 | jffs2_dbg(1, "%s()\n", __func__); |
145 | ||
146 | if (pageofs > inode->i_size) { | |
1da177e4 | 147 | /* Make new hole frag from old EOF to new page */ |
157078f6 | 148 | struct jffs2_raw_inode ri; |
1da177e4 | 149 | struct jffs2_full_dnode *fn; |
157078f6 | 150 | uint32_t alloc_len; |
182ec4ee | 151 | |
9c261b33 JP |
152 | jffs2_dbg(1, "Writing new hole frag 0x%x-0x%x between current EOF and new page\n", |
153 | (unsigned int)inode->i_size, pageofs); | |
1da177e4 | 154 | |
157078f6 TB |
155 | ret = jffs2_reserve_space(c, sizeof(ri), &alloc_len, |
156 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); | |
157 | if (ret) | |
cec6502b | 158 | goto out_err; |
157078f6 TB |
159 | |
160 | mutex_lock(&f->sem); | |
1da177e4 LT |
161 | memset(&ri, 0, sizeof(ri)); |
162 | ||
163 | ri.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
164 | ri.nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); | |
165 | ri.totlen = cpu_to_je32(sizeof(ri)); | |
166 | ri.hdr_crc = cpu_to_je32(crc32(0, &ri, sizeof(struct jffs2_unknown_node)-4)); | |
167 | ||
168 | ri.ino = cpu_to_je32(f->inocache->ino); | |
169 | ri.version = cpu_to_je32(++f->highest_version); | |
170 | ri.mode = cpu_to_jemode(inode->i_mode); | |
0cfe53d3 EB |
171 | ri.uid = cpu_to_je16(i_uid_read(inode)); |
172 | ri.gid = cpu_to_je16(i_gid_read(inode)); | |
1da177e4 | 173 | ri.isize = cpu_to_je32(max((uint32_t)inode->i_size, pageofs)); |
c4592b9c | 174 | ri.atime = ri.ctime = ri.mtime = cpu_to_je32(JFFS2_NOW()); |
1da177e4 LT |
175 | ri.offset = cpu_to_je32(inode->i_size); |
176 | ri.dsize = cpu_to_je32(pageofs - inode->i_size); | |
177 | ri.csize = cpu_to_je32(0); | |
178 | ri.compr = JFFS2_COMPR_ZERO; | |
179 | ri.node_crc = cpu_to_je32(crc32(0, &ri, sizeof(ri)-8)); | |
180 | ri.data_crc = cpu_to_je32(0); | |
182ec4ee | 181 | |
9fe4854c | 182 | fn = jffs2_write_dnode(c, f, &ri, NULL, 0, ALLOC_NORMAL); |
1da177e4 LT |
183 | |
184 | if (IS_ERR(fn)) { | |
185 | ret = PTR_ERR(fn); | |
186 | jffs2_complete_reservation(c); | |
157078f6 | 187 | mutex_unlock(&f->sem); |
cec6502b | 188 | goto out_err; |
1da177e4 LT |
189 | } |
190 | ret = jffs2_add_full_dnode_to_inode(c, f, fn); | |
191 | if (f->metadata) { | |
192 | jffs2_mark_node_obsolete(c, f->metadata->raw); | |
193 | jffs2_free_full_dnode(f->metadata); | |
194 | f->metadata = NULL; | |
195 | } | |
196 | if (ret) { | |
9c261b33 JP |
197 | jffs2_dbg(1, "Eep. add_full_dnode_to_inode() failed in write_begin, returned %d\n", |
198 | ret); | |
1da177e4 LT |
199 | jffs2_mark_node_obsolete(c, fn->raw); |
200 | jffs2_free_full_dnode(fn); | |
201 | jffs2_complete_reservation(c); | |
157078f6 | 202 | mutex_unlock(&f->sem); |
cec6502b | 203 | goto out_err; |
1da177e4 LT |
204 | } |
205 | jffs2_complete_reservation(c); | |
206 | inode->i_size = pageofs; | |
157078f6 | 207 | mutex_unlock(&f->sem); |
1da177e4 | 208 | } |
182ec4ee | 209 | |
cec6502b KY |
210 | /* |
211 | * While getting a page and reading data in, lock c->alloc_sem until | |
212 | * the page is Uptodate. Otherwise GC task may attempt to read the same | |
213 | * page in read_cache_page(), which causes a deadlock. | |
214 | */ | |
215 | mutex_lock(&c->alloc_sem); | |
216 | pg = grab_cache_page_write_begin(mapping, index, flags); | |
217 | if (!pg) { | |
218 | ret = -ENOMEM; | |
219 | goto release_sem; | |
220 | } | |
221 | *pagep = pg; | |
222 | ||
205c109a NP |
223 | /* |
224 | * Read in the page if it wasn't already present. Cannot optimize away | |
225 | * the whole page write case until jffs2_write_end can handle the | |
226 | * case of a short-copy. | |
227 | */ | |
228 | if (!PageUptodate(pg)) { | |
157078f6 | 229 | mutex_lock(&f->sem); |
1da177e4 | 230 | ret = jffs2_do_readpage_nolock(inode, pg); |
157078f6 | 231 | mutex_unlock(&f->sem); |
cec6502b KY |
232 | if (ret) { |
233 | unlock_page(pg); | |
234 | put_page(pg); | |
235 | goto release_sem; | |
236 | } | |
1da177e4 | 237 | } |
9c261b33 | 238 | jffs2_dbg(1, "end write_begin(). pg->flags %lx\n", pg->flags); |
205c109a | 239 | |
cec6502b KY |
240 | release_sem: |
241 | mutex_unlock(&c->alloc_sem); | |
242 | out_err: | |
1da177e4 LT |
243 | return ret; |
244 | } | |
245 | ||
205c109a NP |
246 | static int jffs2_write_end(struct file *filp, struct address_space *mapping, |
247 | loff_t pos, unsigned len, unsigned copied, | |
248 | struct page *pg, void *fsdata) | |
1da177e4 LT |
249 | { |
250 | /* Actually commit the write from the page cache page we're looking at. | |
251 | * For now, we write the full page out each time. It sucks, but it's simple | |
252 | */ | |
205c109a | 253 | struct inode *inode = mapping->host; |
1da177e4 LT |
254 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); |
255 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
256 | struct jffs2_raw_inode *ri; | |
09cbfeaf | 257 | unsigned start = pos & (PAGE_SIZE - 1); |
205c109a | 258 | unsigned end = start + copied; |
1da177e4 LT |
259 | unsigned aligned_start = start & ~3; |
260 | int ret = 0; | |
261 | uint32_t writtenlen = 0; | |
262 | ||
9c261b33 | 263 | jffs2_dbg(1, "%s(): ino #%lu, page at 0x%lx, range %d-%d, flags %lx\n", |
09cbfeaf | 264 | __func__, inode->i_ino, pg->index << PAGE_SHIFT, |
9c261b33 | 265 | start, end, pg->flags); |
1da177e4 | 266 | |
205c109a NP |
267 | /* We need to avoid deadlock with page_cache_read() in |
268 | jffs2_garbage_collect_pass(). So the page must be | |
269 | up to date to prevent page_cache_read() from trying | |
270 | to re-lock it. */ | |
271 | BUG_ON(!PageUptodate(pg)); | |
272 | ||
09cbfeaf | 273 | if (end == PAGE_SIZE) { |
205c109a NP |
274 | /* When writing out the end of a page, write out the |
275 | _whole_ page. This helps to reduce the number of | |
276 | nodes in files which have many short writes, like | |
277 | syslog files. */ | |
2a754b51 | 278 | aligned_start = 0; |
1da177e4 LT |
279 | } |
280 | ||
281 | ri = jffs2_alloc_raw_inode(); | |
282 | ||
283 | if (!ri) { | |
9c261b33 JP |
284 | jffs2_dbg(1, "%s(): Allocation of raw inode failed\n", |
285 | __func__); | |
205c109a | 286 | unlock_page(pg); |
09cbfeaf | 287 | put_page(pg); |
1da177e4 LT |
288 | return -ENOMEM; |
289 | } | |
290 | ||
291 | /* Set the fields that the generic jffs2_write_inode_range() code can't find */ | |
292 | ri->ino = cpu_to_je32(inode->i_ino); | |
293 | ri->mode = cpu_to_jemode(inode->i_mode); | |
0cfe53d3 EB |
294 | ri->uid = cpu_to_je16(i_uid_read(inode)); |
295 | ri->gid = cpu_to_je16(i_gid_read(inode)); | |
1da177e4 | 296 | ri->isize = cpu_to_je32((uint32_t)inode->i_size); |
c4592b9c | 297 | ri->atime = ri->ctime = ri->mtime = cpu_to_je32(JFFS2_NOW()); |
1da177e4 LT |
298 | |
299 | /* In 2.4, it was already kmapped by generic_file_write(). Doesn't | |
300 | hurt to do it again. The alternative is ifdefs, which are ugly. */ | |
301 | kmap(pg); | |
302 | ||
303 | ret = jffs2_write_inode_range(c, f, ri, page_address(pg) + aligned_start, | |
09cbfeaf | 304 | (pg->index << PAGE_SHIFT) + aligned_start, |
1da177e4 LT |
305 | end - aligned_start, &writtenlen); |
306 | ||
307 | kunmap(pg); | |
308 | ||
309 | if (ret) { | |
310 | /* There was an error writing. */ | |
311 | SetPageError(pg); | |
312 | } | |
182ec4ee | 313 | |
1da177e4 | 314 | /* Adjust writtenlen for the padding we did, so we don't confuse our caller */ |
2a754b51 | 315 | writtenlen -= min(writtenlen, (start - aligned_start)); |
1da177e4 LT |
316 | |
317 | if (writtenlen) { | |
2a754b51 NP |
318 | if (inode->i_size < pos + writtenlen) { |
319 | inode->i_size = pos + writtenlen; | |
1da177e4 | 320 | inode->i_blocks = (inode->i_size + 511) >> 9; |
182ec4ee | 321 | |
c4592b9c | 322 | inode->i_ctime = inode->i_mtime = ITIME(je32_to_cpu(ri->ctime)); |
1da177e4 LT |
323 | } |
324 | } | |
325 | ||
326 | jffs2_free_raw_inode(ri); | |
327 | ||
328 | if (start+writtenlen < end) { | |
329 | /* generic_file_write has written more to the page cache than we've | |
182ec4ee | 330 | actually written to the medium. Mark the page !Uptodate so that |
1da177e4 | 331 | it gets reread */ |
9c261b33 JP |
332 | jffs2_dbg(1, "%s(): Not all bytes written. Marking page !uptodate\n", |
333 | __func__); | |
1da177e4 LT |
334 | SetPageError(pg); |
335 | ClearPageUptodate(pg); | |
336 | } | |
337 | ||
9c261b33 JP |
338 | jffs2_dbg(1, "%s() returning %d\n", |
339 | __func__, writtenlen > 0 ? writtenlen : ret); | |
205c109a | 340 | unlock_page(pg); |
09cbfeaf | 341 | put_page(pg); |
205c109a | 342 | return writtenlen > 0 ? writtenlen : ret; |
1da177e4 | 343 | } |