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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 | * | |
10 | * $Id: file.c,v 1.99 2004/11/16 20:36:11 dwmw2 Exp $ | |
11 | * | |
12 | */ | |
13 | ||
14 | #include <linux/version.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/fs.h> | |
18 | #include <linux/time.h> | |
19 | #include <linux/pagemap.h> | |
20 | #include <linux/highmem.h> | |
21 | #include <linux/crc32.h> | |
22 | #include <linux/jffs2.h> | |
23 | #include "nodelist.h" | |
24 | ||
25 | extern int generic_file_open(struct inode *, struct file *) __attribute__((weak)); | |
26 | extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin) __attribute__((weak)); | |
27 | ||
28 | static int jffs2_commit_write (struct file *filp, struct page *pg, | |
29 | unsigned start, unsigned end); | |
30 | static int jffs2_prepare_write (struct file *filp, struct page *pg, | |
31 | unsigned start, unsigned end); | |
32 | static int jffs2_readpage (struct file *filp, struct page *pg); | |
33 | ||
34 | int jffs2_fsync(struct file *filp, struct dentry *dentry, int datasync) | |
35 | { | |
36 | struct inode *inode = dentry->d_inode; | |
37 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
38 | ||
39 | /* Trigger GC to flush any pending writes for this inode */ | |
40 | jffs2_flush_wbuf_gc(c, inode->i_ino); | |
41 | ||
42 | return 0; | |
43 | } | |
44 | ||
45 | struct file_operations jffs2_file_operations = | |
46 | { | |
47 | .llseek = generic_file_llseek, | |
48 | .open = generic_file_open, | |
49 | .read = generic_file_read, | |
50 | .write = generic_file_write, | |
51 | .ioctl = jffs2_ioctl, | |
52 | .mmap = generic_file_readonly_mmap, | |
53 | .fsync = jffs2_fsync, | |
54 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,29) | |
55 | .sendfile = generic_file_sendfile | |
56 | #endif | |
57 | }; | |
58 | ||
59 | /* jffs2_file_inode_operations */ | |
60 | ||
61 | struct inode_operations jffs2_file_inode_operations = | |
62 | { | |
63 | .setattr = jffs2_setattr | |
64 | }; | |
65 | ||
66 | struct address_space_operations jffs2_file_address_operations = | |
67 | { | |
68 | .readpage = jffs2_readpage, | |
69 | .prepare_write =jffs2_prepare_write, | |
70 | .commit_write = jffs2_commit_write | |
71 | }; | |
72 | ||
73 | static int jffs2_do_readpage_nolock (struct inode *inode, struct page *pg) | |
74 | { | |
75 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
76 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
77 | unsigned char *pg_buf; | |
78 | int ret; | |
79 | ||
80 | D2(printk(KERN_DEBUG "jffs2_do_readpage_nolock(): ino #%lu, page at offset 0x%lx\n", inode->i_ino, pg->index << PAGE_CACHE_SHIFT)); | |
81 | ||
82 | if (!PageLocked(pg)) | |
83 | PAGE_BUG(pg); | |
84 | ||
85 | pg_buf = kmap(pg); | |
86 | /* FIXME: Can kmap fail? */ | |
87 | ||
88 | ret = jffs2_read_inode_range(c, f, pg_buf, pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE); | |
89 | ||
90 | if (ret) { | |
91 | ClearPageUptodate(pg); | |
92 | SetPageError(pg); | |
93 | } else { | |
94 | SetPageUptodate(pg); | |
95 | ClearPageError(pg); | |
96 | } | |
97 | ||
98 | flush_dcache_page(pg); | |
99 | kunmap(pg); | |
100 | ||
101 | D2(printk(KERN_DEBUG "readpage finished\n")); | |
102 | return 0; | |
103 | } | |
104 | ||
105 | int jffs2_do_readpage_unlock(struct inode *inode, struct page *pg) | |
106 | { | |
107 | int ret = jffs2_do_readpage_nolock(inode, pg); | |
108 | unlock_page(pg); | |
109 | return ret; | |
110 | } | |
111 | ||
112 | ||
113 | static int jffs2_readpage (struct file *filp, struct page *pg) | |
114 | { | |
115 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(pg->mapping->host); | |
116 | int ret; | |
117 | ||
118 | down(&f->sem); | |
119 | ret = jffs2_do_readpage_unlock(pg->mapping->host, pg); | |
120 | up(&f->sem); | |
121 | return ret; | |
122 | } | |
123 | ||
124 | static int jffs2_prepare_write (struct file *filp, struct page *pg, | |
125 | unsigned start, unsigned end) | |
126 | { | |
127 | struct inode *inode = pg->mapping->host; | |
128 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
129 | uint32_t pageofs = pg->index << PAGE_CACHE_SHIFT; | |
130 | int ret = 0; | |
131 | ||
132 | D1(printk(KERN_DEBUG "jffs2_prepare_write()\n")); | |
133 | ||
134 | if (pageofs > inode->i_size) { | |
135 | /* Make new hole frag from old EOF to new page */ | |
136 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
137 | struct jffs2_raw_inode ri; | |
138 | struct jffs2_full_dnode *fn; | |
139 | uint32_t phys_ofs, alloc_len; | |
140 | ||
141 | D1(printk(KERN_DEBUG "Writing new hole frag 0x%x-0x%x between current EOF and new page\n", | |
142 | (unsigned int)inode->i_size, pageofs)); | |
143 | ||
144 | ret = jffs2_reserve_space(c, sizeof(ri), &phys_ofs, &alloc_len, ALLOC_NORMAL); | |
145 | if (ret) | |
146 | return ret; | |
147 | ||
148 | down(&f->sem); | |
149 | memset(&ri, 0, sizeof(ri)); | |
150 | ||
151 | ri.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
152 | ri.nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); | |
153 | ri.totlen = cpu_to_je32(sizeof(ri)); | |
154 | ri.hdr_crc = cpu_to_je32(crc32(0, &ri, sizeof(struct jffs2_unknown_node)-4)); | |
155 | ||
156 | ri.ino = cpu_to_je32(f->inocache->ino); | |
157 | ri.version = cpu_to_je32(++f->highest_version); | |
158 | ri.mode = cpu_to_jemode(inode->i_mode); | |
159 | ri.uid = cpu_to_je16(inode->i_uid); | |
160 | ri.gid = cpu_to_je16(inode->i_gid); | |
161 | ri.isize = cpu_to_je32(max((uint32_t)inode->i_size, pageofs)); | |
162 | ri.atime = ri.ctime = ri.mtime = cpu_to_je32(get_seconds()); | |
163 | ri.offset = cpu_to_je32(inode->i_size); | |
164 | ri.dsize = cpu_to_je32(pageofs - inode->i_size); | |
165 | ri.csize = cpu_to_je32(0); | |
166 | ri.compr = JFFS2_COMPR_ZERO; | |
167 | ri.node_crc = cpu_to_je32(crc32(0, &ri, sizeof(ri)-8)); | |
168 | ri.data_crc = cpu_to_je32(0); | |
169 | ||
170 | fn = jffs2_write_dnode(c, f, &ri, NULL, 0, phys_ofs, ALLOC_NORMAL); | |
171 | ||
172 | if (IS_ERR(fn)) { | |
173 | ret = PTR_ERR(fn); | |
174 | jffs2_complete_reservation(c); | |
175 | up(&f->sem); | |
176 | return ret; | |
177 | } | |
178 | ret = jffs2_add_full_dnode_to_inode(c, f, fn); | |
179 | if (f->metadata) { | |
180 | jffs2_mark_node_obsolete(c, f->metadata->raw); | |
181 | jffs2_free_full_dnode(f->metadata); | |
182 | f->metadata = NULL; | |
183 | } | |
184 | if (ret) { | |
185 | D1(printk(KERN_DEBUG "Eep. add_full_dnode_to_inode() failed in prepare_write, returned %d\n", ret)); | |
186 | jffs2_mark_node_obsolete(c, fn->raw); | |
187 | jffs2_free_full_dnode(fn); | |
188 | jffs2_complete_reservation(c); | |
189 | up(&f->sem); | |
190 | return ret; | |
191 | } | |
192 | jffs2_complete_reservation(c); | |
193 | inode->i_size = pageofs; | |
194 | up(&f->sem); | |
195 | } | |
196 | ||
197 | /* Read in the page if it wasn't already present, unless it's a whole page */ | |
198 | if (!PageUptodate(pg) && (start || end < PAGE_CACHE_SIZE)) { | |
199 | down(&f->sem); | |
200 | ret = jffs2_do_readpage_nolock(inode, pg); | |
201 | up(&f->sem); | |
202 | } | |
203 | D1(printk(KERN_DEBUG "end prepare_write(). pg->flags %lx\n", pg->flags)); | |
204 | return ret; | |
205 | } | |
206 | ||
207 | static int jffs2_commit_write (struct file *filp, struct page *pg, | |
208 | unsigned start, unsigned end) | |
209 | { | |
210 | /* Actually commit the write from the page cache page we're looking at. | |
211 | * For now, we write the full page out each time. It sucks, but it's simple | |
212 | */ | |
213 | struct inode *inode = pg->mapping->host; | |
214 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
215 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
216 | struct jffs2_raw_inode *ri; | |
217 | unsigned aligned_start = start & ~3; | |
218 | int ret = 0; | |
219 | uint32_t writtenlen = 0; | |
220 | ||
221 | D1(printk(KERN_DEBUG "jffs2_commit_write(): ino #%lu, page at 0x%lx, range %d-%d, flags %lx\n", | |
222 | inode->i_ino, pg->index << PAGE_CACHE_SHIFT, start, end, pg->flags)); | |
223 | ||
224 | if (!start && end == PAGE_CACHE_SIZE) { | |
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 | } | |
231 | ||
232 | ri = jffs2_alloc_raw_inode(); | |
233 | ||
234 | if (!ri) { | |
235 | D1(printk(KERN_DEBUG "jffs2_commit_write(): Allocation of raw inode failed\n")); | |
236 | return -ENOMEM; | |
237 | } | |
238 | ||
239 | /* Set the fields that the generic jffs2_write_inode_range() code can't find */ | |
240 | ri->ino = cpu_to_je32(inode->i_ino); | |
241 | ri->mode = cpu_to_jemode(inode->i_mode); | |
242 | ri->uid = cpu_to_je16(inode->i_uid); | |
243 | ri->gid = cpu_to_je16(inode->i_gid); | |
244 | ri->isize = cpu_to_je32((uint32_t)inode->i_size); | |
245 | ri->atime = ri->ctime = ri->mtime = cpu_to_je32(get_seconds()); | |
246 | ||
247 | /* In 2.4, it was already kmapped by generic_file_write(). Doesn't | |
248 | hurt to do it again. The alternative is ifdefs, which are ugly. */ | |
249 | kmap(pg); | |
250 | ||
251 | ret = jffs2_write_inode_range(c, f, ri, page_address(pg) + aligned_start, | |
252 | (pg->index << PAGE_CACHE_SHIFT) + aligned_start, | |
253 | end - aligned_start, &writtenlen); | |
254 | ||
255 | kunmap(pg); | |
256 | ||
257 | if (ret) { | |
258 | /* There was an error writing. */ | |
259 | SetPageError(pg); | |
260 | } | |
261 | ||
262 | /* Adjust writtenlen for the padding we did, so we don't confuse our caller */ | |
263 | if (writtenlen < (start&3)) | |
264 | writtenlen = 0; | |
265 | else | |
266 | writtenlen -= (start&3); | |
267 | ||
268 | if (writtenlen) { | |
269 | if (inode->i_size < (pg->index << PAGE_CACHE_SHIFT) + start + writtenlen) { | |
270 | inode->i_size = (pg->index << PAGE_CACHE_SHIFT) + start + writtenlen; | |
271 | inode->i_blocks = (inode->i_size + 511) >> 9; | |
272 | ||
273 | inode->i_ctime = inode->i_mtime = ITIME(je32_to_cpu(ri->ctime)); | |
274 | } | |
275 | } | |
276 | ||
277 | jffs2_free_raw_inode(ri); | |
278 | ||
279 | if (start+writtenlen < end) { | |
280 | /* generic_file_write has written more to the page cache than we've | |
281 | actually written to the medium. Mark the page !Uptodate so that | |
282 | it gets reread */ | |
283 | D1(printk(KERN_DEBUG "jffs2_commit_write(): Not all bytes written. Marking page !uptodate\n")); | |
284 | SetPageError(pg); | |
285 | ClearPageUptodate(pg); | |
286 | } | |
287 | ||
288 | D1(printk(KERN_DEBUG "jffs2_commit_write() returning %d\n",writtenlen?writtenlen:ret)); | |
289 | return writtenlen?writtenlen:ret; | |
290 | } |