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1da177e4 LT |
1 | /* |
2 | * JFFS2 -- Journalling Flash File System, Version 2. | |
3 | * | |
4 | * Copyright (C) 2001-2003 Red Hat, Inc. | |
5 | * | |
6 | * Created by David Woodhouse <dwmw2@infradead.org> | |
7 | * | |
8 | * For licensing information, see the file 'LICENCE' in this directory. | |
9 | * | |
265489f0 | 10 | * $Id: file.c,v 1.102 2005/07/06 12:13:09 dwmw2 Exp $ |
1da177e4 LT |
11 | * |
12 | */ | |
13 | ||
1da177e4 LT |
14 | #include <linux/kernel.h> |
15 | #include <linux/slab.h> | |
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 | ||
24 | extern int generic_file_open(struct inode *, struct file *) __attribute__((weak)); | |
25 | extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin) __attribute__((weak)); | |
26 | ||
27 | static int jffs2_commit_write (struct file *filp, struct page *pg, | |
28 | unsigned start, unsigned end); | |
29 | static int jffs2_prepare_write (struct file *filp, struct page *pg, | |
30 | unsigned start, unsigned end); | |
31 | static int jffs2_readpage (struct file *filp, struct page *pg); | |
32 | ||
33 | int jffs2_fsync(struct file *filp, struct dentry *dentry, int datasync) | |
34 | { | |
35 | struct inode *inode = dentry->d_inode; | |
36 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
37 | ||
38 | /* Trigger GC to flush any pending writes for this inode */ | |
39 | jffs2_flush_wbuf_gc(c, inode->i_ino); | |
40 | ||
41 | return 0; | |
42 | } | |
43 | ||
44 | struct file_operations jffs2_file_operations = | |
45 | { | |
46 | .llseek = generic_file_llseek, | |
47 | .open = generic_file_open, | |
48 | .read = generic_file_read, | |
49 | .write = generic_file_write, | |
50 | .ioctl = jffs2_ioctl, | |
51 | .mmap = generic_file_readonly_mmap, | |
52 | .fsync = jffs2_fsync, | |
1da177e4 | 53 | .sendfile = generic_file_sendfile |
1da177e4 LT |
54 | }; |
55 | ||
56 | /* jffs2_file_inode_operations */ | |
57 | ||
58 | struct inode_operations jffs2_file_inode_operations = | |
59 | { | |
60 | .setattr = jffs2_setattr | |
61 | }; | |
62 | ||
63 | struct address_space_operations jffs2_file_address_operations = | |
64 | { | |
65 | .readpage = jffs2_readpage, | |
66 | .prepare_write =jffs2_prepare_write, | |
67 | .commit_write = jffs2_commit_write | |
68 | }; | |
69 | ||
70 | static int jffs2_do_readpage_nolock (struct inode *inode, struct page *pg) | |
71 | { | |
72 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
73 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
74 | unsigned char *pg_buf; | |
75 | int ret; | |
76 | ||
77 | D2(printk(KERN_DEBUG "jffs2_do_readpage_nolock(): ino #%lu, page at offset 0x%lx\n", inode->i_ino, pg->index << PAGE_CACHE_SHIFT)); | |
78 | ||
cd7619d6 | 79 | BUG_ON(!PageLocked(pg)); |
1da177e4 LT |
80 | |
81 | pg_buf = kmap(pg); | |
82 | /* FIXME: Can kmap fail? */ | |
83 | ||
84 | ret = jffs2_read_inode_range(c, f, pg_buf, pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE); | |
85 | ||
86 | if (ret) { | |
87 | ClearPageUptodate(pg); | |
88 | SetPageError(pg); | |
89 | } else { | |
90 | SetPageUptodate(pg); | |
91 | ClearPageError(pg); | |
92 | } | |
93 | ||
94 | flush_dcache_page(pg); | |
95 | kunmap(pg); | |
96 | ||
97 | D2(printk(KERN_DEBUG "readpage finished\n")); | |
98 | return 0; | |
99 | } | |
100 | ||
101 | int jffs2_do_readpage_unlock(struct inode *inode, struct page *pg) | |
102 | { | |
103 | int ret = jffs2_do_readpage_nolock(inode, pg); | |
104 | unlock_page(pg); | |
105 | return ret; | |
106 | } | |
107 | ||
108 | ||
109 | static int jffs2_readpage (struct file *filp, struct page *pg) | |
110 | { | |
111 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(pg->mapping->host); | |
112 | int ret; | |
113 | ||
114 | down(&f->sem); | |
115 | ret = jffs2_do_readpage_unlock(pg->mapping->host, pg); | |
116 | up(&f->sem); | |
117 | return ret; | |
118 | } | |
119 | ||
120 | static int jffs2_prepare_write (struct file *filp, struct page *pg, | |
121 | unsigned start, unsigned end) | |
122 | { | |
123 | struct inode *inode = pg->mapping->host; | |
124 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
125 | uint32_t pageofs = pg->index << PAGE_CACHE_SHIFT; | |
126 | int ret = 0; | |
127 | ||
128 | D1(printk(KERN_DEBUG "jffs2_prepare_write()\n")); | |
129 | ||
130 | if (pageofs > inode->i_size) { | |
131 | /* Make new hole frag from old EOF to new page */ | |
132 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
133 | struct jffs2_raw_inode ri; | |
134 | struct jffs2_full_dnode *fn; | |
135 | uint32_t phys_ofs, alloc_len; | |
136 | ||
137 | D1(printk(KERN_DEBUG "Writing new hole frag 0x%x-0x%x between current EOF and new page\n", | |
138 | (unsigned int)inode->i_size, pageofs)); | |
139 | ||
140 | ret = jffs2_reserve_space(c, sizeof(ri), &phys_ofs, &alloc_len, ALLOC_NORMAL); | |
141 | if (ret) | |
142 | return ret; | |
143 | ||
144 | down(&f->sem); | |
145 | memset(&ri, 0, sizeof(ri)); | |
146 | ||
147 | ri.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
148 | ri.nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); | |
149 | ri.totlen = cpu_to_je32(sizeof(ri)); | |
150 | ri.hdr_crc = cpu_to_je32(crc32(0, &ri, sizeof(struct jffs2_unknown_node)-4)); | |
151 | ||
152 | ri.ino = cpu_to_je32(f->inocache->ino); | |
153 | ri.version = cpu_to_je32(++f->highest_version); | |
154 | ri.mode = cpu_to_jemode(inode->i_mode); | |
155 | ri.uid = cpu_to_je16(inode->i_uid); | |
156 | ri.gid = cpu_to_je16(inode->i_gid); | |
157 | ri.isize = cpu_to_je32(max((uint32_t)inode->i_size, pageofs)); | |
158 | ri.atime = ri.ctime = ri.mtime = cpu_to_je32(get_seconds()); | |
159 | ri.offset = cpu_to_je32(inode->i_size); | |
160 | ri.dsize = cpu_to_je32(pageofs - inode->i_size); | |
161 | ri.csize = cpu_to_je32(0); | |
162 | ri.compr = JFFS2_COMPR_ZERO; | |
163 | ri.node_crc = cpu_to_je32(crc32(0, &ri, sizeof(ri)-8)); | |
164 | ri.data_crc = cpu_to_je32(0); | |
165 | ||
166 | fn = jffs2_write_dnode(c, f, &ri, NULL, 0, phys_ofs, ALLOC_NORMAL); | |
167 | ||
168 | if (IS_ERR(fn)) { | |
169 | ret = PTR_ERR(fn); | |
170 | jffs2_complete_reservation(c); | |
171 | up(&f->sem); | |
172 | return ret; | |
173 | } | |
174 | ret = jffs2_add_full_dnode_to_inode(c, f, fn); | |
175 | if (f->metadata) { | |
176 | jffs2_mark_node_obsolete(c, f->metadata->raw); | |
177 | jffs2_free_full_dnode(f->metadata); | |
178 | f->metadata = NULL; | |
179 | } | |
180 | if (ret) { | |
181 | D1(printk(KERN_DEBUG "Eep. add_full_dnode_to_inode() failed in prepare_write, returned %d\n", ret)); | |
182 | jffs2_mark_node_obsolete(c, fn->raw); | |
183 | jffs2_free_full_dnode(fn); | |
184 | jffs2_complete_reservation(c); | |
185 | up(&f->sem); | |
186 | return ret; | |
187 | } | |
188 | jffs2_complete_reservation(c); | |
189 | inode->i_size = pageofs; | |
190 | up(&f->sem); | |
191 | } | |
192 | ||
193 | /* Read in the page if it wasn't already present, unless it's a whole page */ | |
194 | if (!PageUptodate(pg) && (start || end < PAGE_CACHE_SIZE)) { | |
195 | down(&f->sem); | |
196 | ret = jffs2_do_readpage_nolock(inode, pg); | |
197 | up(&f->sem); | |
198 | } | |
199 | D1(printk(KERN_DEBUG "end prepare_write(). pg->flags %lx\n", pg->flags)); | |
200 | return ret; | |
201 | } | |
202 | ||
203 | static int jffs2_commit_write (struct file *filp, struct page *pg, | |
204 | unsigned start, unsigned end) | |
205 | { | |
206 | /* Actually commit the write from the page cache page we're looking at. | |
207 | * For now, we write the full page out each time. It sucks, but it's simple | |
208 | */ | |
209 | struct inode *inode = pg->mapping->host; | |
210 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
211 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
212 | struct jffs2_raw_inode *ri; | |
213 | unsigned aligned_start = start & ~3; | |
214 | int ret = 0; | |
215 | uint32_t writtenlen = 0; | |
216 | ||
217 | D1(printk(KERN_DEBUG "jffs2_commit_write(): ino #%lu, page at 0x%lx, range %d-%d, flags %lx\n", | |
218 | inode->i_ino, pg->index << PAGE_CACHE_SHIFT, start, end, pg->flags)); | |
219 | ||
220 | if (!start && end == PAGE_CACHE_SIZE) { | |
221 | /* We need to avoid deadlock with page_cache_read() in | |
222 | jffs2_garbage_collect_pass(). So we have to mark the | |
223 | page up to date, to prevent page_cache_read() from | |
224 | trying to re-lock it. */ | |
225 | SetPageUptodate(pg); | |
226 | } | |
227 | ||
228 | ri = jffs2_alloc_raw_inode(); | |
229 | ||
230 | if (!ri) { | |
231 | D1(printk(KERN_DEBUG "jffs2_commit_write(): Allocation of raw inode failed\n")); | |
232 | return -ENOMEM; | |
233 | } | |
234 | ||
235 | /* Set the fields that the generic jffs2_write_inode_range() code can't find */ | |
236 | ri->ino = cpu_to_je32(inode->i_ino); | |
237 | ri->mode = cpu_to_jemode(inode->i_mode); | |
238 | ri->uid = cpu_to_je16(inode->i_uid); | |
239 | ri->gid = cpu_to_je16(inode->i_gid); | |
240 | ri->isize = cpu_to_je32((uint32_t)inode->i_size); | |
241 | ri->atime = ri->ctime = ri->mtime = cpu_to_je32(get_seconds()); | |
242 | ||
243 | /* In 2.4, it was already kmapped by generic_file_write(). Doesn't | |
244 | hurt to do it again. The alternative is ifdefs, which are ugly. */ | |
245 | kmap(pg); | |
246 | ||
247 | ret = jffs2_write_inode_range(c, f, ri, page_address(pg) + aligned_start, | |
248 | (pg->index << PAGE_CACHE_SHIFT) + aligned_start, | |
249 | end - aligned_start, &writtenlen); | |
250 | ||
251 | kunmap(pg); | |
252 | ||
253 | if (ret) { | |
254 | /* There was an error writing. */ | |
255 | SetPageError(pg); | |
256 | } | |
257 | ||
258 | /* Adjust writtenlen for the padding we did, so we don't confuse our caller */ | |
259 | if (writtenlen < (start&3)) | |
260 | writtenlen = 0; | |
261 | else | |
262 | writtenlen -= (start&3); | |
263 | ||
264 | if (writtenlen) { | |
265 | if (inode->i_size < (pg->index << PAGE_CACHE_SHIFT) + start + writtenlen) { | |
266 | inode->i_size = (pg->index << PAGE_CACHE_SHIFT) + start + writtenlen; | |
267 | inode->i_blocks = (inode->i_size + 511) >> 9; | |
268 | ||
269 | inode->i_ctime = inode->i_mtime = ITIME(je32_to_cpu(ri->ctime)); | |
270 | } | |
271 | } | |
272 | ||
273 | jffs2_free_raw_inode(ri); | |
274 | ||
275 | if (start+writtenlen < end) { | |
276 | /* generic_file_write has written more to the page cache than we've | |
277 | actually written to the medium. Mark the page !Uptodate so that | |
278 | it gets reread */ | |
279 | D1(printk(KERN_DEBUG "jffs2_commit_write(): Not all bytes written. Marking page !uptodate\n")); | |
280 | SetPageError(pg); | |
281 | ClearPageUptodate(pg); | |
282 | } | |
283 | ||
284 | D1(printk(KERN_DEBUG "jffs2_commit_write() returning %d\n",writtenlen?writtenlen:ret)); | |
285 | return writtenlen?writtenlen:ret; | |
286 | } |