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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 | * | |
4fc67fbe | 10 | * $Id: file.c,v 1.104 2005/10/18 23:29:35 tpoynor 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 | ||
1da177e4 LT |
24 | static int jffs2_commit_write (struct file *filp, struct page *pg, |
25 | unsigned start, unsigned end); | |
26 | static int jffs2_prepare_write (struct file *filp, struct page *pg, | |
27 | unsigned start, unsigned end); | |
28 | static int jffs2_readpage (struct file *filp, struct page *pg); | |
29 | ||
30 | int jffs2_fsync(struct file *filp, struct dentry *dentry, int datasync) | |
31 | { | |
32 | struct inode *inode = dentry->d_inode; | |
33 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
34 | ||
35 | /* Trigger GC to flush any pending writes for this inode */ | |
36 | jffs2_flush_wbuf_gc(c, inode->i_ino); | |
182ec4ee TG |
37 | |
38 | return 0; | |
1da177e4 LT |
39 | } |
40 | ||
41 | struct file_operations jffs2_file_operations = | |
42 | { | |
43 | .llseek = generic_file_llseek, | |
44 | .open = generic_file_open, | |
45 | .read = generic_file_read, | |
46 | .write = generic_file_write, | |
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 | ||
55 | struct inode_operations jffs2_file_inode_operations = | |
56 | { | |
57 | .setattr = jffs2_setattr | |
58 | }; | |
59 | ||
60 | struct address_space_operations jffs2_file_address_operations = | |
61 | { | |
62 | .readpage = jffs2_readpage, | |
63 | .prepare_write =jffs2_prepare_write, | |
64 | .commit_write = jffs2_commit_write | |
65 | }; | |
66 | ||
67 | static int jffs2_do_readpage_nolock (struct inode *inode, struct page *pg) | |
68 | { | |
69 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
70 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
71 | unsigned char *pg_buf; | |
72 | int ret; | |
73 | ||
74 | D2(printk(KERN_DEBUG "jffs2_do_readpage_nolock(): ino #%lu, page at offset 0x%lx\n", inode->i_ino, pg->index << PAGE_CACHE_SHIFT)); | |
75 | ||
cd7619d6 | 76 | BUG_ON(!PageLocked(pg)); |
1da177e4 LT |
77 | |
78 | pg_buf = kmap(pg); | |
79 | /* FIXME: Can kmap fail? */ | |
80 | ||
81 | ret = jffs2_read_inode_range(c, f, pg_buf, pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE); | |
82 | ||
83 | if (ret) { | |
84 | ClearPageUptodate(pg); | |
85 | SetPageError(pg); | |
86 | } else { | |
87 | SetPageUptodate(pg); | |
88 | ClearPageError(pg); | |
89 | } | |
90 | ||
91 | flush_dcache_page(pg); | |
92 | kunmap(pg); | |
93 | ||
94 | D2(printk(KERN_DEBUG "readpage finished\n")); | |
95 | return 0; | |
96 | } | |
97 | ||
98 | int jffs2_do_readpage_unlock(struct inode *inode, struct page *pg) | |
99 | { | |
100 | int ret = jffs2_do_readpage_nolock(inode, pg); | |
101 | unlock_page(pg); | |
102 | return ret; | |
103 | } | |
104 | ||
105 | ||
106 | static int jffs2_readpage (struct file *filp, struct page *pg) | |
107 | { | |
108 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(pg->mapping->host); | |
109 | int ret; | |
182ec4ee | 110 | |
1da177e4 LT |
111 | down(&f->sem); |
112 | ret = jffs2_do_readpage_unlock(pg->mapping->host, pg); | |
113 | up(&f->sem); | |
114 | return ret; | |
115 | } | |
116 | ||
117 | static int jffs2_prepare_write (struct file *filp, struct page *pg, | |
118 | unsigned start, unsigned end) | |
119 | { | |
120 | struct inode *inode = pg->mapping->host; | |
121 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
122 | uint32_t pageofs = pg->index << PAGE_CACHE_SHIFT; | |
123 | int ret = 0; | |
124 | ||
125 | D1(printk(KERN_DEBUG "jffs2_prepare_write()\n")); | |
126 | ||
127 | if (pageofs > inode->i_size) { | |
128 | /* Make new hole frag from old EOF to new page */ | |
129 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
130 | struct jffs2_raw_inode ri; | |
131 | struct jffs2_full_dnode *fn; | |
132 | uint32_t phys_ofs, alloc_len; | |
182ec4ee | 133 | |
1da177e4 LT |
134 | D1(printk(KERN_DEBUG "Writing new hole frag 0x%x-0x%x between current EOF and new page\n", |
135 | (unsigned int)inode->i_size, pageofs)); | |
136 | ||
e631ddba FH |
137 | ret = jffs2_reserve_space(c, sizeof(ri), &phys_ofs, &alloc_len, |
138 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); | |
1da177e4 LT |
139 | if (ret) |
140 | return ret; | |
141 | ||
142 | down(&f->sem); | |
143 | memset(&ri, 0, sizeof(ri)); | |
144 | ||
145 | ri.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
146 | ri.nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); | |
147 | ri.totlen = cpu_to_je32(sizeof(ri)); | |
148 | ri.hdr_crc = cpu_to_je32(crc32(0, &ri, sizeof(struct jffs2_unknown_node)-4)); | |
149 | ||
150 | ri.ino = cpu_to_je32(f->inocache->ino); | |
151 | ri.version = cpu_to_je32(++f->highest_version); | |
152 | ri.mode = cpu_to_jemode(inode->i_mode); | |
153 | ri.uid = cpu_to_je16(inode->i_uid); | |
154 | ri.gid = cpu_to_je16(inode->i_gid); | |
155 | ri.isize = cpu_to_je32(max((uint32_t)inode->i_size, pageofs)); | |
156 | ri.atime = ri.ctime = ri.mtime = cpu_to_je32(get_seconds()); | |
157 | ri.offset = cpu_to_je32(inode->i_size); | |
158 | ri.dsize = cpu_to_je32(pageofs - inode->i_size); | |
159 | ri.csize = cpu_to_je32(0); | |
160 | ri.compr = JFFS2_COMPR_ZERO; | |
161 | ri.node_crc = cpu_to_je32(crc32(0, &ri, sizeof(ri)-8)); | |
162 | ri.data_crc = cpu_to_je32(0); | |
182ec4ee | 163 | |
1da177e4 LT |
164 | fn = jffs2_write_dnode(c, f, &ri, NULL, 0, phys_ofs, ALLOC_NORMAL); |
165 | ||
166 | if (IS_ERR(fn)) { | |
167 | ret = PTR_ERR(fn); | |
168 | jffs2_complete_reservation(c); | |
169 | up(&f->sem); | |
170 | return ret; | |
171 | } | |
172 | ret = jffs2_add_full_dnode_to_inode(c, f, fn); | |
173 | if (f->metadata) { | |
174 | jffs2_mark_node_obsolete(c, f->metadata->raw); | |
175 | jffs2_free_full_dnode(f->metadata); | |
176 | f->metadata = NULL; | |
177 | } | |
178 | if (ret) { | |
179 | D1(printk(KERN_DEBUG "Eep. add_full_dnode_to_inode() failed in prepare_write, returned %d\n", ret)); | |
180 | jffs2_mark_node_obsolete(c, fn->raw); | |
181 | jffs2_free_full_dnode(fn); | |
182 | jffs2_complete_reservation(c); | |
183 | up(&f->sem); | |
184 | return ret; | |
185 | } | |
186 | jffs2_complete_reservation(c); | |
187 | inode->i_size = pageofs; | |
188 | up(&f->sem); | |
189 | } | |
182ec4ee | 190 | |
1da177e4 LT |
191 | /* Read in the page if it wasn't already present, unless it's a whole page */ |
192 | if (!PageUptodate(pg) && (start || end < PAGE_CACHE_SIZE)) { | |
193 | down(&f->sem); | |
194 | ret = jffs2_do_readpage_nolock(inode, pg); | |
195 | up(&f->sem); | |
196 | } | |
197 | D1(printk(KERN_DEBUG "end prepare_write(). pg->flags %lx\n", pg->flags)); | |
198 | return ret; | |
199 | } | |
200 | ||
201 | static int jffs2_commit_write (struct file *filp, struct page *pg, | |
202 | unsigned start, unsigned end) | |
203 | { | |
204 | /* Actually commit the write from the page cache page we're looking at. | |
205 | * For now, we write the full page out each time. It sucks, but it's simple | |
206 | */ | |
207 | struct inode *inode = pg->mapping->host; | |
208 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
209 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
210 | struct jffs2_raw_inode *ri; | |
211 | unsigned aligned_start = start & ~3; | |
212 | int ret = 0; | |
213 | uint32_t writtenlen = 0; | |
214 | ||
215 | D1(printk(KERN_DEBUG "jffs2_commit_write(): ino #%lu, page at 0x%lx, range %d-%d, flags %lx\n", | |
216 | inode->i_ino, pg->index << PAGE_CACHE_SHIFT, start, end, pg->flags)); | |
217 | ||
218 | if (!start && end == PAGE_CACHE_SIZE) { | |
219 | /* We need to avoid deadlock with page_cache_read() in | |
220 | jffs2_garbage_collect_pass(). So we have to mark the | |
182ec4ee | 221 | page up to date, to prevent page_cache_read() from |
1da177e4 LT |
222 | trying to re-lock it. */ |
223 | SetPageUptodate(pg); | |
224 | } | |
225 | ||
226 | ri = jffs2_alloc_raw_inode(); | |
227 | ||
228 | if (!ri) { | |
229 | D1(printk(KERN_DEBUG "jffs2_commit_write(): Allocation of raw inode failed\n")); | |
230 | return -ENOMEM; | |
231 | } | |
232 | ||
233 | /* Set the fields that the generic jffs2_write_inode_range() code can't find */ | |
234 | ri->ino = cpu_to_je32(inode->i_ino); | |
235 | ri->mode = cpu_to_jemode(inode->i_mode); | |
236 | ri->uid = cpu_to_je16(inode->i_uid); | |
237 | ri->gid = cpu_to_je16(inode->i_gid); | |
238 | ri->isize = cpu_to_je32((uint32_t)inode->i_size); | |
239 | ri->atime = ri->ctime = ri->mtime = cpu_to_je32(get_seconds()); | |
240 | ||
241 | /* In 2.4, it was already kmapped by generic_file_write(). Doesn't | |
242 | hurt to do it again. The alternative is ifdefs, which are ugly. */ | |
243 | kmap(pg); | |
244 | ||
245 | ret = jffs2_write_inode_range(c, f, ri, page_address(pg) + aligned_start, | |
246 | (pg->index << PAGE_CACHE_SHIFT) + aligned_start, | |
247 | end - aligned_start, &writtenlen); | |
248 | ||
249 | kunmap(pg); | |
250 | ||
251 | if (ret) { | |
252 | /* There was an error writing. */ | |
253 | SetPageError(pg); | |
254 | } | |
182ec4ee | 255 | |
1da177e4 LT |
256 | /* Adjust writtenlen for the padding we did, so we don't confuse our caller */ |
257 | if (writtenlen < (start&3)) | |
258 | writtenlen = 0; | |
259 | else | |
260 | writtenlen -= (start&3); | |
261 | ||
262 | if (writtenlen) { | |
263 | if (inode->i_size < (pg->index << PAGE_CACHE_SHIFT) + start + writtenlen) { | |
264 | inode->i_size = (pg->index << PAGE_CACHE_SHIFT) + start + writtenlen; | |
265 | inode->i_blocks = (inode->i_size + 511) >> 9; | |
182ec4ee | 266 | |
1da177e4 LT |
267 | inode->i_ctime = inode->i_mtime = ITIME(je32_to_cpu(ri->ctime)); |
268 | } | |
269 | } | |
270 | ||
271 | jffs2_free_raw_inode(ri); | |
272 | ||
273 | if (start+writtenlen < end) { | |
274 | /* generic_file_write has written more to the page cache than we've | |
182ec4ee | 275 | actually written to the medium. Mark the page !Uptodate so that |
1da177e4 LT |
276 | it gets reread */ |
277 | D1(printk(KERN_DEBUG "jffs2_commit_write(): Not all bytes written. Marking page !uptodate\n")); | |
278 | SetPageError(pg); | |
279 | ClearPageUptodate(pg); | |
280 | } | |
281 | ||
4fc67fbe TP |
282 | D1(printk(KERN_DEBUG "jffs2_commit_write() returning %d\n",start+writtenlen==end?0:ret)); |
283 | return start+writtenlen==end?0:ret; | |
1da177e4 | 284 | } |