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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * JFFS2 -- Journalling Flash File System, Version 2.
3 *
David Woodhousec00c3102007-04-25 14:16:47 +01004 * Copyright © 2001-2007 Red Hat, Inc.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 *
6 * Created by David Woodhouse <dwmw2@infradead.org>
7 *
8 * For licensing information, see the file 'LICENCE' in this directory.
9 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 */
11
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <linux/fs.h>
14#include <linux/time.h>
15#include <linux/pagemap.h>
16#include <linux/highmem.h>
17#include <linux/crc32.h>
18#include <linux/jffs2.h>
19#include "nodelist.h"
20
Nick Piggin205c1092007-10-16 01:25:18 -070021static int jffs2_write_end(struct file *filp, struct address_space *mapping,
22 loff_t pos, unsigned len, unsigned copied,
23 struct page *pg, void *fsdata);
24static int jffs2_write_begin(struct file *filp, struct address_space *mapping,
25 loff_t pos, unsigned len, unsigned flags,
26 struct page **pagep, void **fsdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -070027static int jffs2_readpage (struct file *filp, struct page *pg);
28
Christoph Hellwig7ea80852010-05-26 17:53:25 +020029int jffs2_fsync(struct file *filp, int datasync)
Linus Torvalds1da177e2005-04-16 15:20:36 -070030{
Christoph Hellwig7ea80852010-05-26 17:53:25 +020031 struct inode *inode = filp->f_mapping->host;
Linus Torvalds1da177e2005-04-16 15:20:36 -070032 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
33
34 /* Trigger GC to flush any pending writes for this inode */
35 jffs2_flush_wbuf_gc(c, inode->i_ino);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +000036
37 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070038}
39
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -080040const struct file_operations jffs2_file_operations =
Linus Torvalds1da177e2005-04-16 15:20:36 -070041{
42 .llseek = generic_file_llseek,
43 .open = generic_file_open,
Badari Pulavarty543ade12006-09-30 23:28:48 -070044 .read = do_sync_read,
45 .aio_read = generic_file_aio_read,
46 .write = do_sync_write,
47 .aio_write = generic_file_aio_write,
Stoyan Gaydarov0533400b2008-07-07 07:45:59 -050048 .unlocked_ioctl=jffs2_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 .mmap = generic_file_readonly_mmap,
50 .fsync = jffs2_fsync,
Jens Axboe5ffc4ef2007-06-01 11:49:19 +020051 .splice_read = generic_file_splice_read,
Linus Torvalds1da177e2005-04-16 15:20:36 -070052};
53
54/* jffs2_file_inode_operations */
55
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -080056const struct inode_operations jffs2_file_inode_operations =
Linus Torvalds1da177e2005-04-16 15:20:36 -070057{
Linus Torvalds18f4c642009-08-28 12:29:03 -070058 .check_acl = jffs2_check_acl,
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +090059 .setattr = jffs2_setattr,
60 .setxattr = jffs2_setxattr,
61 .getxattr = jffs2_getxattr,
62 .listxattr = jffs2_listxattr,
63 .removexattr = jffs2_removexattr
Linus Torvalds1da177e2005-04-16 15:20:36 -070064};
65
Christoph Hellwigf5e54d62006-06-28 04:26:44 -070066const struct address_space_operations jffs2_file_address_operations =
Linus Torvalds1da177e2005-04-16 15:20:36 -070067{
68 .readpage = jffs2_readpage,
Nick Piggin205c1092007-10-16 01:25:18 -070069 .write_begin = jffs2_write_begin,
70 .write_end = jffs2_write_end,
Linus Torvalds1da177e2005-04-16 15:20:36 -070071};
72
73static 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
Matt Mackallcd7619d2005-05-01 08:59:01 -070082 BUG_ON(!PageLocked(pg));
Linus Torvalds1da177e2005-04-16 15:20:36 -070083
84 pg_buf = kmap(pg);
85 /* FIXME: Can kmap fail? */
86
87 ret = jffs2_read_inode_range(c, f, pg_buf, pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE);
88
89 if (ret) {
90 ClearPageUptodate(pg);
91 SetPageError(pg);
92 } else {
93 SetPageUptodate(pg);
94 ClearPageError(pg);
95 }
96
97 flush_dcache_page(pg);
98 kunmap(pg);
99
100 D2(printk(KERN_DEBUG "readpage finished\n"));
Anders Grafström57ca7de2009-08-04 13:11:47 +0200101 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102}
103
104int jffs2_do_readpage_unlock(struct inode *inode, struct page *pg)
105{
106 int ret = jffs2_do_readpage_nolock(inode, pg);
107 unlock_page(pg);
108 return ret;
109}
110
111
112static int jffs2_readpage (struct file *filp, struct page *pg)
113{
114 struct jffs2_inode_info *f = JFFS2_INODE_INFO(pg->mapping->host);
115 int ret;
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000116
David Woodhouseced22072008-04-22 15:13:40 +0100117 mutex_lock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 ret = jffs2_do_readpage_unlock(pg->mapping->host, pg);
David Woodhouseced22072008-04-22 15:13:40 +0100119 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 return ret;
121}
122
Nick Piggin205c1092007-10-16 01:25:18 -0700123static int jffs2_write_begin(struct file *filp, struct address_space *mapping,
124 loff_t pos, unsigned len, unsigned flags,
125 struct page **pagep, void **fsdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126{
Nick Piggin205c1092007-10-16 01:25:18 -0700127 struct page *pg;
128 struct inode *inode = mapping->host;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
Nick Piggin205c1092007-10-16 01:25:18 -0700130 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
Alexey Korolevabe2f412008-04-14 20:45:06 +0100131 uint32_t pageofs = index << PAGE_CACHE_SHIFT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 int ret = 0;
133
Nick Piggin54566b22009-01-04 12:00:53 -0800134 pg = grab_cache_page_write_begin(mapping, index, flags);
Nick Piggin205c1092007-10-16 01:25:18 -0700135 if (!pg)
136 return -ENOMEM;
137 *pagep = pg;
138
139 D1(printk(KERN_DEBUG "jffs2_write_begin()\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140
141 if (pageofs > inode->i_size) {
142 /* Make new hole frag from old EOF to new page */
143 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
144 struct jffs2_raw_inode ri;
145 struct jffs2_full_dnode *fn;
David Woodhouse9fe48542006-05-23 00:38:06 +0100146 uint32_t alloc_len;
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000147
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 D1(printk(KERN_DEBUG "Writing new hole frag 0x%x-0x%x between current EOF and new page\n",
149 (unsigned int)inode->i_size, pageofs));
150
David Woodhouse9fe48542006-05-23 00:38:06 +0100151 ret = jffs2_reserve_space(c, sizeof(ri), &alloc_len,
152 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 if (ret)
Nick Piggin205c1092007-10-16 01:25:18 -0700154 goto out_page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155
David Woodhouseced22072008-04-22 15:13:40 +0100156 mutex_lock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 memset(&ri, 0, sizeof(ri));
158
159 ri.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
160 ri.nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE);
161 ri.totlen = cpu_to_je32(sizeof(ri));
162 ri.hdr_crc = cpu_to_je32(crc32(0, &ri, sizeof(struct jffs2_unknown_node)-4));
163
164 ri.ino = cpu_to_je32(f->inocache->ino);
165 ri.version = cpu_to_je32(++f->highest_version);
166 ri.mode = cpu_to_jemode(inode->i_mode);
167 ri.uid = cpu_to_je16(inode->i_uid);
168 ri.gid = cpu_to_je16(inode->i_gid);
169 ri.isize = cpu_to_je32(max((uint32_t)inode->i_size, pageofs));
170 ri.atime = ri.ctime = ri.mtime = cpu_to_je32(get_seconds());
171 ri.offset = cpu_to_je32(inode->i_size);
172 ri.dsize = cpu_to_je32(pageofs - inode->i_size);
173 ri.csize = cpu_to_je32(0);
174 ri.compr = JFFS2_COMPR_ZERO;
175 ri.node_crc = cpu_to_je32(crc32(0, &ri, sizeof(ri)-8));
176 ri.data_crc = cpu_to_je32(0);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000177
David Woodhouse9fe48542006-05-23 00:38:06 +0100178 fn = jffs2_write_dnode(c, f, &ri, NULL, 0, ALLOC_NORMAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
180 if (IS_ERR(fn)) {
181 ret = PTR_ERR(fn);
182 jffs2_complete_reservation(c);
David Woodhouseced22072008-04-22 15:13:40 +0100183 mutex_unlock(&f->sem);
Nick Piggin205c1092007-10-16 01:25:18 -0700184 goto out_page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 }
186 ret = jffs2_add_full_dnode_to_inode(c, f, fn);
187 if (f->metadata) {
188 jffs2_mark_node_obsolete(c, f->metadata->raw);
189 jffs2_free_full_dnode(f->metadata);
190 f->metadata = NULL;
191 }
192 if (ret) {
Nick Piggin205c1092007-10-16 01:25:18 -0700193 D1(printk(KERN_DEBUG "Eep. add_full_dnode_to_inode() failed in write_begin, returned %d\n", ret));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 jffs2_mark_node_obsolete(c, fn->raw);
195 jffs2_free_full_dnode(fn);
196 jffs2_complete_reservation(c);
David Woodhouseced22072008-04-22 15:13:40 +0100197 mutex_unlock(&f->sem);
Nick Piggin205c1092007-10-16 01:25:18 -0700198 goto out_page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 }
200 jffs2_complete_reservation(c);
201 inode->i_size = pageofs;
David Woodhouseced22072008-04-22 15:13:40 +0100202 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 }
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000204
Nick Piggin205c1092007-10-16 01:25:18 -0700205 /*
206 * Read in the page if it wasn't already present. Cannot optimize away
207 * the whole page write case until jffs2_write_end can handle the
208 * case of a short-copy.
209 */
210 if (!PageUptodate(pg)) {
David Woodhouseced22072008-04-22 15:13:40 +0100211 mutex_lock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 ret = jffs2_do_readpage_nolock(inode, pg);
David Woodhouseced22072008-04-22 15:13:40 +0100213 mutex_unlock(&f->sem);
Nick Piggin205c1092007-10-16 01:25:18 -0700214 if (ret)
215 goto out_page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 }
Nick Piggin205c1092007-10-16 01:25:18 -0700217 D1(printk(KERN_DEBUG "end write_begin(). pg->flags %lx\n", pg->flags));
218 return ret;
219
220out_page:
221 unlock_page(pg);
222 page_cache_release(pg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 return ret;
224}
225
Nick Piggin205c1092007-10-16 01:25:18 -0700226static int jffs2_write_end(struct file *filp, struct address_space *mapping,
227 loff_t pos, unsigned len, unsigned copied,
228 struct page *pg, void *fsdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229{
230 /* Actually commit the write from the page cache page we're looking at.
231 * For now, we write the full page out each time. It sucks, but it's simple
232 */
Nick Piggin205c1092007-10-16 01:25:18 -0700233 struct inode *inode = mapping->host;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
235 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
236 struct jffs2_raw_inode *ri;
Nick Piggin205c1092007-10-16 01:25:18 -0700237 unsigned start = pos & (PAGE_CACHE_SIZE - 1);
238 unsigned end = start + copied;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 unsigned aligned_start = start & ~3;
240 int ret = 0;
241 uint32_t writtenlen = 0;
242
Nick Piggin205c1092007-10-16 01:25:18 -0700243 D1(printk(KERN_DEBUG "jffs2_write_end(): ino #%lu, page at 0x%lx, range %d-%d, flags %lx\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 inode->i_ino, pg->index << PAGE_CACHE_SHIFT, start, end, pg->flags));
245
Nick Piggin205c1092007-10-16 01:25:18 -0700246 /* We need to avoid deadlock with page_cache_read() in
247 jffs2_garbage_collect_pass(). So the page must be
248 up to date to prevent page_cache_read() from trying
249 to re-lock it. */
250 BUG_ON(!PageUptodate(pg));
251
David Woodhousecf5eba52006-05-14 04:06:24 +0100252 if (end == PAGE_CACHE_SIZE) {
Nick Piggin205c1092007-10-16 01:25:18 -0700253 /* When writing out the end of a page, write out the
254 _whole_ page. This helps to reduce the number of
255 nodes in files which have many short writes, like
256 syslog files. */
Nick Piggin2a754b52007-10-19 17:16:53 +1000257 aligned_start = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 }
259
260 ri = jffs2_alloc_raw_inode();
261
262 if (!ri) {
Nick Piggin205c1092007-10-16 01:25:18 -0700263 D1(printk(KERN_DEBUG "jffs2_write_end(): Allocation of raw inode failed\n"));
264 unlock_page(pg);
265 page_cache_release(pg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 return -ENOMEM;
267 }
268
269 /* Set the fields that the generic jffs2_write_inode_range() code can't find */
270 ri->ino = cpu_to_je32(inode->i_ino);
271 ri->mode = cpu_to_jemode(inode->i_mode);
272 ri->uid = cpu_to_je16(inode->i_uid);
273 ri->gid = cpu_to_je16(inode->i_gid);
274 ri->isize = cpu_to_je32((uint32_t)inode->i_size);
275 ri->atime = ri->ctime = ri->mtime = cpu_to_je32(get_seconds());
276
277 /* In 2.4, it was already kmapped by generic_file_write(). Doesn't
278 hurt to do it again. The alternative is ifdefs, which are ugly. */
279 kmap(pg);
280
281 ret = jffs2_write_inode_range(c, f, ri, page_address(pg) + aligned_start,
282 (pg->index << PAGE_CACHE_SHIFT) + aligned_start,
283 end - aligned_start, &writtenlen);
284
285 kunmap(pg);
286
287 if (ret) {
288 /* There was an error writing. */
289 SetPageError(pg);
290 }
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000291
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 /* Adjust writtenlen for the padding we did, so we don't confuse our caller */
Nick Piggin2a754b52007-10-19 17:16:53 +1000293 writtenlen -= min(writtenlen, (start - aligned_start));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294
295 if (writtenlen) {
Nick Piggin2a754b52007-10-19 17:16:53 +1000296 if (inode->i_size < pos + writtenlen) {
297 inode->i_size = pos + writtenlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 inode->i_blocks = (inode->i_size + 511) >> 9;
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000299
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 inode->i_ctime = inode->i_mtime = ITIME(je32_to_cpu(ri->ctime));
301 }
302 }
303
304 jffs2_free_raw_inode(ri);
305
306 if (start+writtenlen < end) {
307 /* generic_file_write has written more to the page cache than we've
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000308 actually written to the medium. Mark the page !Uptodate so that
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 it gets reread */
Nick Piggin205c1092007-10-16 01:25:18 -0700310 D1(printk(KERN_DEBUG "jffs2_write_end(): Not all bytes written. Marking page !uptodate\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 SetPageError(pg);
312 ClearPageUptodate(pg);
313 }
314
Nick Piggin205c1092007-10-16 01:25:18 -0700315 D1(printk(KERN_DEBUG "jffs2_write_end() returning %d\n",
316 writtenlen > 0 ? writtenlen : ret));
317 unlock_page(pg);
318 page_cache_release(pg);
319 return writtenlen > 0 ? writtenlen : ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320}