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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 LT |
12 | #include <linux/kernel.h> |
13 | #include <linux/slab.h> | |
14 | #include <linux/fs.h> | |
15 | #include <linux/time.h> | |
16 | #include <linux/pagemap.h> | |
17 | #include <linux/highmem.h> | |
18 | #include <linux/crc32.h> | |
19 | #include <linux/jffs2.h> | |
20 | #include "nodelist.h" | |
21 | ||
1da177e4 LT |
22 | static int jffs2_commit_write (struct file *filp, struct page *pg, |
23 | unsigned start, unsigned end); | |
24 | static int jffs2_prepare_write (struct file *filp, struct page *pg, | |
25 | unsigned start, unsigned end); | |
26 | static int jffs2_readpage (struct file *filp, struct page *pg); | |
27 | ||
28 | int jffs2_fsync(struct file *filp, struct dentry *dentry, int datasync) | |
29 | { | |
30 | struct inode *inode = dentry->d_inode; | |
31 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
32 | ||
33 | /* Trigger GC to flush any pending writes for this inode */ | |
34 | jffs2_flush_wbuf_gc(c, inode->i_ino); | |
182ec4ee TG |
35 | |
36 | return 0; | |
1da177e4 LT |
37 | } |
38 | ||
4b6f5d20 | 39 | const struct file_operations jffs2_file_operations = |
1da177e4 LT |
40 | { |
41 | .llseek = generic_file_llseek, | |
42 | .open = generic_file_open, | |
543ade1f BP |
43 | .read = do_sync_read, |
44 | .aio_read = generic_file_aio_read, | |
45 | .write = do_sync_write, | |
46 | .aio_write = generic_file_aio_write, | |
1da177e4 LT |
47 | .ioctl = jffs2_ioctl, |
48 | .mmap = generic_file_readonly_mmap, | |
49 | .fsync = jffs2_fsync, | |
1da177e4 | 50 | .sendfile = generic_file_sendfile |
1da177e4 LT |
51 | }; |
52 | ||
53 | /* jffs2_file_inode_operations */ | |
54 | ||
92e1d5be | 55 | const struct inode_operations jffs2_file_inode_operations = |
1da177e4 | 56 | { |
aa98d7cf KK |
57 | .permission = jffs2_permission, |
58 | .setattr = jffs2_setattr, | |
59 | .setxattr = jffs2_setxattr, | |
60 | .getxattr = jffs2_getxattr, | |
61 | .listxattr = jffs2_listxattr, | |
62 | .removexattr = jffs2_removexattr | |
1da177e4 LT |
63 | }; |
64 | ||
f5e54d6e | 65 | const struct address_space_operations jffs2_file_address_operations = |
1da177e4 LT |
66 | { |
67 | .readpage = jffs2_readpage, | |
68 | .prepare_write =jffs2_prepare_write, | |
69 | .commit_write = jffs2_commit_write | |
70 | }; | |
71 | ||
72 | static int jffs2_do_readpage_nolock (struct inode *inode, struct page *pg) | |
73 | { | |
74 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
75 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
76 | unsigned char *pg_buf; | |
77 | int ret; | |
78 | ||
79 | D2(printk(KERN_DEBUG "jffs2_do_readpage_nolock(): ino #%lu, page at offset 0x%lx\n", inode->i_ino, pg->index << PAGE_CACHE_SHIFT)); | |
80 | ||
cd7619d6 | 81 | BUG_ON(!PageLocked(pg)); |
1da177e4 LT |
82 | |
83 | pg_buf = kmap(pg); | |
84 | /* FIXME: Can kmap fail? */ | |
85 | ||
86 | ret = jffs2_read_inode_range(c, f, pg_buf, pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE); | |
87 | ||
88 | if (ret) { | |
89 | ClearPageUptodate(pg); | |
90 | SetPageError(pg); | |
91 | } else { | |
92 | SetPageUptodate(pg); | |
93 | ClearPageError(pg); | |
94 | } | |
95 | ||
96 | flush_dcache_page(pg); | |
97 | kunmap(pg); | |
98 | ||
99 | D2(printk(KERN_DEBUG "readpage finished\n")); | |
100 | return 0; | |
101 | } | |
102 | ||
103 | int jffs2_do_readpage_unlock(struct inode *inode, struct page *pg) | |
104 | { | |
105 | int ret = jffs2_do_readpage_nolock(inode, pg); | |
106 | unlock_page(pg); | |
107 | return ret; | |
108 | } | |
109 | ||
110 | ||
111 | static int jffs2_readpage (struct file *filp, struct page *pg) | |
112 | { | |
113 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(pg->mapping->host); | |
114 | int ret; | |
182ec4ee | 115 | |
1da177e4 LT |
116 | down(&f->sem); |
117 | ret = jffs2_do_readpage_unlock(pg->mapping->host, pg); | |
118 | up(&f->sem); | |
119 | return ret; | |
120 | } | |
121 | ||
122 | static int jffs2_prepare_write (struct file *filp, struct page *pg, | |
123 | unsigned start, unsigned end) | |
124 | { | |
125 | struct inode *inode = pg->mapping->host; | |
126 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
127 | uint32_t pageofs = pg->index << PAGE_CACHE_SHIFT; | |
128 | int ret = 0; | |
129 | ||
130 | D1(printk(KERN_DEBUG "jffs2_prepare_write()\n")); | |
131 | ||
132 | if (pageofs > inode->i_size) { | |
133 | /* Make new hole frag from old EOF to new page */ | |
134 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
135 | struct jffs2_raw_inode ri; | |
136 | struct jffs2_full_dnode *fn; | |
9fe4854c | 137 | uint32_t alloc_len; |
182ec4ee | 138 | |
1da177e4 LT |
139 | D1(printk(KERN_DEBUG "Writing new hole frag 0x%x-0x%x between current EOF and new page\n", |
140 | (unsigned int)inode->i_size, pageofs)); | |
141 | ||
9fe4854c DW |
142 | ret = jffs2_reserve_space(c, sizeof(ri), &alloc_len, |
143 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); | |
1da177e4 LT |
144 | if (ret) |
145 | return ret; | |
146 | ||
147 | down(&f->sem); | |
148 | memset(&ri, 0, sizeof(ri)); | |
149 | ||
150 | ri.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
151 | ri.nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); | |
152 | ri.totlen = cpu_to_je32(sizeof(ri)); | |
153 | ri.hdr_crc = cpu_to_je32(crc32(0, &ri, sizeof(struct jffs2_unknown_node)-4)); | |
154 | ||
155 | ri.ino = cpu_to_je32(f->inocache->ino); | |
156 | ri.version = cpu_to_je32(++f->highest_version); | |
157 | ri.mode = cpu_to_jemode(inode->i_mode); | |
158 | ri.uid = cpu_to_je16(inode->i_uid); | |
159 | ri.gid = cpu_to_je16(inode->i_gid); | |
160 | ri.isize = cpu_to_je32(max((uint32_t)inode->i_size, pageofs)); | |
161 | ri.atime = ri.ctime = ri.mtime = cpu_to_je32(get_seconds()); | |
162 | ri.offset = cpu_to_je32(inode->i_size); | |
163 | ri.dsize = cpu_to_je32(pageofs - inode->i_size); | |
164 | ri.csize = cpu_to_je32(0); | |
165 | ri.compr = JFFS2_COMPR_ZERO; | |
166 | ri.node_crc = cpu_to_je32(crc32(0, &ri, sizeof(ri)-8)); | |
167 | ri.data_crc = cpu_to_je32(0); | |
182ec4ee | 168 | |
9fe4854c | 169 | fn = jffs2_write_dnode(c, f, &ri, NULL, 0, ALLOC_NORMAL); |
1da177e4 LT |
170 | |
171 | if (IS_ERR(fn)) { | |
172 | ret = PTR_ERR(fn); | |
173 | jffs2_complete_reservation(c); | |
174 | up(&f->sem); | |
175 | return ret; | |
176 | } | |
177 | ret = jffs2_add_full_dnode_to_inode(c, f, fn); | |
178 | if (f->metadata) { | |
179 | jffs2_mark_node_obsolete(c, f->metadata->raw); | |
180 | jffs2_free_full_dnode(f->metadata); | |
181 | f->metadata = NULL; | |
182 | } | |
183 | if (ret) { | |
184 | D1(printk(KERN_DEBUG "Eep. add_full_dnode_to_inode() failed in prepare_write, returned %d\n", ret)); | |
185 | jffs2_mark_node_obsolete(c, fn->raw); | |
186 | jffs2_free_full_dnode(fn); | |
187 | jffs2_complete_reservation(c); | |
188 | up(&f->sem); | |
189 | return ret; | |
190 | } | |
191 | jffs2_complete_reservation(c); | |
192 | inode->i_size = pageofs; | |
193 | up(&f->sem); | |
194 | } | |
182ec4ee | 195 | |
1da177e4 LT |
196 | /* Read in the page if it wasn't already present, unless it's a whole page */ |
197 | if (!PageUptodate(pg) && (start || end < PAGE_CACHE_SIZE)) { | |
198 | down(&f->sem); | |
199 | ret = jffs2_do_readpage_nolock(inode, pg); | |
200 | up(&f->sem); | |
201 | } | |
202 | D1(printk(KERN_DEBUG "end prepare_write(). pg->flags %lx\n", pg->flags)); | |
203 | return ret; | |
204 | } | |
205 | ||
206 | static int jffs2_commit_write (struct file *filp, struct page *pg, | |
207 | unsigned start, unsigned end) | |
208 | { | |
209 | /* Actually commit the write from the page cache page we're looking at. | |
210 | * For now, we write the full page out each time. It sucks, but it's simple | |
211 | */ | |
212 | struct inode *inode = pg->mapping->host; | |
213 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
214 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
215 | struct jffs2_raw_inode *ri; | |
216 | unsigned aligned_start = start & ~3; | |
217 | int ret = 0; | |
218 | uint32_t writtenlen = 0; | |
219 | ||
220 | D1(printk(KERN_DEBUG "jffs2_commit_write(): ino #%lu, page at 0x%lx, range %d-%d, flags %lx\n", | |
221 | inode->i_ino, pg->index << PAGE_CACHE_SHIFT, start, end, pg->flags)); | |
222 | ||
cf5eba53 DW |
223 | if (end == PAGE_CACHE_SIZE) { |
224 | if (!start) { | |
225 | /* We need to avoid deadlock with page_cache_read() in | |
226 | jffs2_garbage_collect_pass(). So we have to mark the | |
227 | page up to date, to prevent page_cache_read() from | |
228 | trying to re-lock it. */ | |
229 | SetPageUptodate(pg); | |
230 | } else { | |
231 | /* When writing out the end of a page, write out the | |
232 | _whole_ page. This helps to reduce the number of | |
233 | nodes in files which have many short writes, like | |
234 | syslog files. */ | |
235 | start = aligned_start = 0; | |
236 | } | |
1da177e4 LT |
237 | } |
238 | ||
239 | ri = jffs2_alloc_raw_inode(); | |
240 | ||
241 | if (!ri) { | |
242 | D1(printk(KERN_DEBUG "jffs2_commit_write(): Allocation of raw inode failed\n")); | |
243 | return -ENOMEM; | |
244 | } | |
245 | ||
246 | /* Set the fields that the generic jffs2_write_inode_range() code can't find */ | |
247 | ri->ino = cpu_to_je32(inode->i_ino); | |
248 | ri->mode = cpu_to_jemode(inode->i_mode); | |
249 | ri->uid = cpu_to_je16(inode->i_uid); | |
250 | ri->gid = cpu_to_je16(inode->i_gid); | |
251 | ri->isize = cpu_to_je32((uint32_t)inode->i_size); | |
252 | ri->atime = ri->ctime = ri->mtime = cpu_to_je32(get_seconds()); | |
253 | ||
254 | /* In 2.4, it was already kmapped by generic_file_write(). Doesn't | |
255 | hurt to do it again. The alternative is ifdefs, which are ugly. */ | |
256 | kmap(pg); | |
257 | ||
258 | ret = jffs2_write_inode_range(c, f, ri, page_address(pg) + aligned_start, | |
259 | (pg->index << PAGE_CACHE_SHIFT) + aligned_start, | |
260 | end - aligned_start, &writtenlen); | |
261 | ||
262 | kunmap(pg); | |
263 | ||
264 | if (ret) { | |
265 | /* There was an error writing. */ | |
266 | SetPageError(pg); | |
267 | } | |
182ec4ee | 268 | |
1da177e4 LT |
269 | /* Adjust writtenlen for the padding we did, so we don't confuse our caller */ |
270 | if (writtenlen < (start&3)) | |
271 | writtenlen = 0; | |
272 | else | |
273 | writtenlen -= (start&3); | |
274 | ||
275 | if (writtenlen) { | |
276 | if (inode->i_size < (pg->index << PAGE_CACHE_SHIFT) + start + writtenlen) { | |
277 | inode->i_size = (pg->index << PAGE_CACHE_SHIFT) + start + writtenlen; | |
278 | inode->i_blocks = (inode->i_size + 511) >> 9; | |
182ec4ee | 279 | |
1da177e4 LT |
280 | inode->i_ctime = inode->i_mtime = ITIME(je32_to_cpu(ri->ctime)); |
281 | } | |
282 | } | |
283 | ||
284 | jffs2_free_raw_inode(ri); | |
285 | ||
286 | if (start+writtenlen < end) { | |
287 | /* generic_file_write has written more to the page cache than we've | |
182ec4ee | 288 | actually written to the medium. Mark the page !Uptodate so that |
1da177e4 LT |
289 | it gets reread */ |
290 | D1(printk(KERN_DEBUG "jffs2_commit_write(): Not all bytes written. Marking page !uptodate\n")); | |
291 | SetPageError(pg); | |
292 | ClearPageUptodate(pg); | |
293 | } | |
294 | ||
4fc67fbe TP |
295 | D1(printk(KERN_DEBUG "jffs2_commit_write() returning %d\n",start+writtenlen==end?0:ret)); |
296 | return start+writtenlen==end?0:ret; | |
1da177e4 | 297 | } |