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 | ||
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, |
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 | 89 | jffs2_dbg(2, "%s(): ino #%lu, page at offset 0x%lx\n", |
09cbfeaf | 90 | __func__, inode->i_ino, pg->index << PAGE_SHIFT); |
1da177e4 | 91 | |
cd7619d6 | 92 | BUG_ON(!PageLocked(pg)); |
1da177e4 LT |
93 | |
94 | pg_buf = kmap(pg); | |
95 | /* FIXME: Can kmap fail? */ | |
96 | ||
09cbfeaf KS |
97 | ret = jffs2_read_inode_range(c, f, pg_buf, pg->index << PAGE_SHIFT, |
98 | PAGE_SIZE); | |
1da177e4 LT |
99 | |
100 | if (ret) { | |
101 | ClearPageUptodate(pg); | |
102 | SetPageError(pg); | |
103 | } else { | |
104 | SetPageUptodate(pg); | |
105 | ClearPageError(pg); | |
106 | } | |
107 | ||
108 | flush_dcache_page(pg); | |
109 | kunmap(pg); | |
110 | ||
9c261b33 | 111 | jffs2_dbg(2, "readpage finished\n"); |
57ca7deb | 112 | return ret; |
1da177e4 LT |
113 | } |
114 | ||
115 | int jffs2_do_readpage_unlock(struct inode *inode, struct page *pg) | |
116 | { | |
117 | int ret = jffs2_do_readpage_nolock(inode, pg); | |
118 | unlock_page(pg); | |
119 | return ret; | |
120 | } | |
121 | ||
122 | ||
123 | static int jffs2_readpage (struct file *filp, struct page *pg) | |
124 | { | |
125 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(pg->mapping->host); | |
126 | int ret; | |
182ec4ee | 127 | |
ced22070 | 128 | mutex_lock(&f->sem); |
1da177e4 | 129 | ret = jffs2_do_readpage_unlock(pg->mapping->host, pg); |
ced22070 | 130 | mutex_unlock(&f->sem); |
1da177e4 LT |
131 | return ret; |
132 | } | |
133 | ||
205c109a NP |
134 | static int jffs2_write_begin(struct file *filp, struct address_space *mapping, |
135 | loff_t pos, unsigned len, unsigned flags, | |
136 | struct page **pagep, void **fsdata) | |
1da177e4 | 137 | { |
205c109a NP |
138 | struct page *pg; |
139 | struct inode *inode = mapping->host; | |
1da177e4 | 140 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); |
09cbfeaf KS |
141 | pgoff_t index = pos >> PAGE_SHIFT; |
142 | uint32_t pageofs = index << PAGE_SHIFT; | |
1da177e4 LT |
143 | int ret = 0; |
144 | ||
54566b2c | 145 | pg = grab_cache_page_write_begin(mapping, index, flags); |
157078f6 | 146 | if (!pg) |
205c109a NP |
147 | return -ENOMEM; |
148 | *pagep = pg; | |
149 | ||
157078f6 TB |
150 | jffs2_dbg(1, "%s()\n", __func__); |
151 | ||
152 | if (pageofs > inode->i_size) { | |
1da177e4 | 153 | /* Make new hole frag from old EOF to new page */ |
157078f6 TB |
154 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); |
155 | struct jffs2_raw_inode ri; | |
1da177e4 | 156 | struct jffs2_full_dnode *fn; |
157078f6 | 157 | uint32_t alloc_len; |
182ec4ee | 158 | |
9c261b33 JP |
159 | jffs2_dbg(1, "Writing new hole frag 0x%x-0x%x between current EOF and new page\n", |
160 | (unsigned int)inode->i_size, pageofs); | |
1da177e4 | 161 | |
157078f6 TB |
162 | ret = jffs2_reserve_space(c, sizeof(ri), &alloc_len, |
163 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); | |
164 | if (ret) | |
165 | goto out_page; | |
166 | ||
167 | mutex_lock(&f->sem); | |
1da177e4 LT |
168 | memset(&ri, 0, sizeof(ri)); |
169 | ||
170 | ri.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
171 | ri.nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); | |
172 | ri.totlen = cpu_to_je32(sizeof(ri)); | |
173 | ri.hdr_crc = cpu_to_je32(crc32(0, &ri, sizeof(struct jffs2_unknown_node)-4)); | |
174 | ||
175 | ri.ino = cpu_to_je32(f->inocache->ino); | |
176 | ri.version = cpu_to_je32(++f->highest_version); | |
177 | ri.mode = cpu_to_jemode(inode->i_mode); | |
0cfe53d3 EB |
178 | ri.uid = cpu_to_je16(i_uid_read(inode)); |
179 | ri.gid = cpu_to_je16(i_gid_read(inode)); | |
1da177e4 LT |
180 | ri.isize = cpu_to_je32(max((uint32_t)inode->i_size, pageofs)); |
181 | ri.atime = ri.ctime = ri.mtime = cpu_to_je32(get_seconds()); | |
182 | ri.offset = cpu_to_je32(inode->i_size); | |
183 | ri.dsize = cpu_to_je32(pageofs - inode->i_size); | |
184 | ri.csize = cpu_to_je32(0); | |
185 | ri.compr = JFFS2_COMPR_ZERO; | |
186 | ri.node_crc = cpu_to_je32(crc32(0, &ri, sizeof(ri)-8)); | |
187 | ri.data_crc = cpu_to_je32(0); | |
182ec4ee | 188 | |
9fe4854c | 189 | fn = jffs2_write_dnode(c, f, &ri, NULL, 0, ALLOC_NORMAL); |
1da177e4 LT |
190 | |
191 | if (IS_ERR(fn)) { | |
192 | ret = PTR_ERR(fn); | |
193 | jffs2_complete_reservation(c); | |
157078f6 | 194 | mutex_unlock(&f->sem); |
205c109a | 195 | goto out_page; |
1da177e4 LT |
196 | } |
197 | ret = jffs2_add_full_dnode_to_inode(c, f, fn); | |
198 | if (f->metadata) { | |
199 | jffs2_mark_node_obsolete(c, f->metadata->raw); | |
200 | jffs2_free_full_dnode(f->metadata); | |
201 | f->metadata = NULL; | |
202 | } | |
203 | if (ret) { | |
9c261b33 JP |
204 | jffs2_dbg(1, "Eep. add_full_dnode_to_inode() failed in write_begin, returned %d\n", |
205 | ret); | |
1da177e4 LT |
206 | jffs2_mark_node_obsolete(c, fn->raw); |
207 | jffs2_free_full_dnode(fn); | |
208 | jffs2_complete_reservation(c); | |
157078f6 | 209 | mutex_unlock(&f->sem); |
205c109a | 210 | goto out_page; |
1da177e4 LT |
211 | } |
212 | jffs2_complete_reservation(c); | |
213 | inode->i_size = pageofs; | |
157078f6 | 214 | mutex_unlock(&f->sem); |
1da177e4 | 215 | } |
182ec4ee | 216 | |
205c109a NP |
217 | /* |
218 | * Read in the page if it wasn't already present. Cannot optimize away | |
219 | * the whole page write case until jffs2_write_end can handle the | |
220 | * case of a short-copy. | |
221 | */ | |
222 | if (!PageUptodate(pg)) { | |
157078f6 | 223 | mutex_lock(&f->sem); |
1da177e4 | 224 | ret = jffs2_do_readpage_nolock(inode, pg); |
157078f6 | 225 | mutex_unlock(&f->sem); |
205c109a NP |
226 | if (ret) |
227 | goto out_page; | |
1da177e4 | 228 | } |
9c261b33 | 229 | jffs2_dbg(1, "end write_begin(). pg->flags %lx\n", pg->flags); |
205c109a NP |
230 | return ret; |
231 | ||
232 | out_page: | |
233 | unlock_page(pg); | |
09cbfeaf | 234 | put_page(pg); |
1da177e4 LT |
235 | return ret; |
236 | } | |
237 | ||
205c109a NP |
238 | static int jffs2_write_end(struct file *filp, struct address_space *mapping, |
239 | loff_t pos, unsigned len, unsigned copied, | |
240 | struct page *pg, void *fsdata) | |
1da177e4 LT |
241 | { |
242 | /* Actually commit the write from the page cache page we're looking at. | |
243 | * For now, we write the full page out each time. It sucks, but it's simple | |
244 | */ | |
205c109a | 245 | struct inode *inode = mapping->host; |
1da177e4 LT |
246 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); |
247 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
248 | struct jffs2_raw_inode *ri; | |
09cbfeaf | 249 | unsigned start = pos & (PAGE_SIZE - 1); |
205c109a | 250 | unsigned end = start + copied; |
1da177e4 LT |
251 | unsigned aligned_start = start & ~3; |
252 | int ret = 0; | |
253 | uint32_t writtenlen = 0; | |
254 | ||
9c261b33 | 255 | jffs2_dbg(1, "%s(): ino #%lu, page at 0x%lx, range %d-%d, flags %lx\n", |
09cbfeaf | 256 | __func__, inode->i_ino, pg->index << PAGE_SHIFT, |
9c261b33 | 257 | start, end, pg->flags); |
1da177e4 | 258 | |
205c109a NP |
259 | /* We need to avoid deadlock with page_cache_read() in |
260 | jffs2_garbage_collect_pass(). So the page must be | |
261 | up to date to prevent page_cache_read() from trying | |
262 | to re-lock it. */ | |
263 | BUG_ON(!PageUptodate(pg)); | |
264 | ||
09cbfeaf | 265 | if (end == PAGE_SIZE) { |
205c109a NP |
266 | /* When writing out the end of a page, write out the |
267 | _whole_ page. This helps to reduce the number of | |
268 | nodes in files which have many short writes, like | |
269 | syslog files. */ | |
2a754b51 | 270 | aligned_start = 0; |
1da177e4 LT |
271 | } |
272 | ||
273 | ri = jffs2_alloc_raw_inode(); | |
274 | ||
275 | if (!ri) { | |
9c261b33 JP |
276 | jffs2_dbg(1, "%s(): Allocation of raw inode failed\n", |
277 | __func__); | |
205c109a | 278 | unlock_page(pg); |
09cbfeaf | 279 | put_page(pg); |
1da177e4 LT |
280 | return -ENOMEM; |
281 | } | |
282 | ||
283 | /* Set the fields that the generic jffs2_write_inode_range() code can't find */ | |
284 | ri->ino = cpu_to_je32(inode->i_ino); | |
285 | ri->mode = cpu_to_jemode(inode->i_mode); | |
0cfe53d3 EB |
286 | ri->uid = cpu_to_je16(i_uid_read(inode)); |
287 | ri->gid = cpu_to_je16(i_gid_read(inode)); | |
1da177e4 LT |
288 | ri->isize = cpu_to_je32((uint32_t)inode->i_size); |
289 | ri->atime = ri->ctime = ri->mtime = cpu_to_je32(get_seconds()); | |
290 | ||
291 | /* In 2.4, it was already kmapped by generic_file_write(). Doesn't | |
292 | hurt to do it again. The alternative is ifdefs, which are ugly. */ | |
293 | kmap(pg); | |
294 | ||
295 | ret = jffs2_write_inode_range(c, f, ri, page_address(pg) + aligned_start, | |
09cbfeaf | 296 | (pg->index << PAGE_SHIFT) + aligned_start, |
1da177e4 LT |
297 | end - aligned_start, &writtenlen); |
298 | ||
299 | kunmap(pg); | |
300 | ||
301 | if (ret) { | |
302 | /* There was an error writing. */ | |
303 | SetPageError(pg); | |
304 | } | |
182ec4ee | 305 | |
1da177e4 | 306 | /* Adjust writtenlen for the padding we did, so we don't confuse our caller */ |
2a754b51 | 307 | writtenlen -= min(writtenlen, (start - aligned_start)); |
1da177e4 LT |
308 | |
309 | if (writtenlen) { | |
2a754b51 NP |
310 | if (inode->i_size < pos + writtenlen) { |
311 | inode->i_size = pos + writtenlen; | |
1da177e4 | 312 | inode->i_blocks = (inode->i_size + 511) >> 9; |
182ec4ee | 313 | |
1da177e4 LT |
314 | inode->i_ctime = inode->i_mtime = ITIME(je32_to_cpu(ri->ctime)); |
315 | } | |
316 | } | |
317 | ||
318 | jffs2_free_raw_inode(ri); | |
319 | ||
320 | if (start+writtenlen < end) { | |
321 | /* generic_file_write has written more to the page cache than we've | |
182ec4ee | 322 | actually written to the medium. Mark the page !Uptodate so that |
1da177e4 | 323 | it gets reread */ |
9c261b33 JP |
324 | jffs2_dbg(1, "%s(): Not all bytes written. Marking page !uptodate\n", |
325 | __func__); | |
1da177e4 LT |
326 | SetPageError(pg); |
327 | ClearPageUptodate(pg); | |
328 | } | |
329 | ||
9c261b33 JP |
330 | jffs2_dbg(1, "%s() returning %d\n", |
331 | __func__, writtenlen > 0 ? writtenlen : ret); | |
205c109a | 332 | unlock_page(pg); |
09cbfeaf | 333 | put_page(pg); |
205c109a | 334 | return writtenlen > 0 ? writtenlen : ret; |
1da177e4 | 335 | } |