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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
3 */
4
Linus Torvalds1da177e2005-04-16 15:20:36 -07005#include <linux/time.h>
6#include <linux/reiserfs_fs.h>
7#include <linux/reiserfs_acl.h>
8#include <linux/reiserfs_xattr.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07009#include <asm/uaccess.h>
10#include <linux/pagemap.h>
11#include <linux/swap.h>
12#include <linux/writeback.h>
13#include <linux/blkdev.h>
14#include <linux/buffer_head.h>
15#include <linux/quotaops.h>
16
17/*
18** We pack the tails of files on file close, not at the time they are written.
19** This implies an unnecessary copy of the tail and an unnecessary indirect item
20** insertion/balancing, for files that are written in one write.
21** It avoids unnecessary tail packings (balances) for files that are written in
22** multiple writes and are small enough to have tails.
23**
24** file_release is called by the VFS layer when the file is closed. If
25** this is the last open file descriptor, and the file
26** small enough to have a tail, and the tail is currently in an
27** unformatted node, the tail is converted back into a direct item.
28**
29** We use reiserfs_truncate_file to pack the tail, since it already has
30** all the conditions coded.
31*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070032static int reiserfs_file_release(struct inode *inode, struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -070033{
34
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070035 struct reiserfs_transaction_handle th;
36 int err;
37 int jbegin_failure = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
Eric Sesterhenn14a61442006-10-03 23:36:38 +020039 BUG_ON(!S_ISREG(inode->i_mode));
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070041 /* fast out for when nothing needs to be done */
42 if ((atomic_read(&inode->i_count) > 1 ||
43 !(REISERFS_I(inode)->i_flags & i_pack_on_close_mask) ||
44 !tail_has_to_be_packed(inode)) &&
45 REISERFS_I(inode)->i_prealloc_count <= 0) {
46 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070047 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070048
Jes Sorensen1b1dcc12006-01-09 15:59:24 -080049 mutex_lock(&inode->i_mutex);
Vladimir Savelievde145692007-01-22 20:40:46 -080050
51 mutex_lock(&(REISERFS_I(inode)->i_mmap));
52 if (REISERFS_I(inode)->i_flags & i_ever_mapped)
53 REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask;
54
Chris Masonb5f39532006-08-05 12:15:08 -070055 reiserfs_write_lock(inode->i_sb);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070056 /* freeing preallocation only involves relogging blocks that
57 * are already in the current transaction. preallocation gets
58 * freed at the end of each transaction, so it is impossible for
59 * us to log any additional blocks (including quota blocks)
60 */
61 err = journal_begin(&th, inode->i_sb, 1);
62 if (err) {
63 /* uh oh, we can't allow the inode to go away while there
64 * is still preallocation blocks pending. Try to join the
65 * aborted transaction
66 */
67 jbegin_failure = err;
68 err = journal_join_abort(&th, inode->i_sb, 1);
69
70 if (err) {
71 /* hmpf, our choices here aren't good. We can pin the inode
72 * which will disallow unmount from every happening, we can
73 * do nothing, which will corrupt random memory on unmount,
74 * or we can forcibly remove the file from the preallocation
75 * list, which will leak blocks on disk. Lets pin the inode
76 * and let the admin know what is going on.
77 */
78 igrab(inode);
79 reiserfs_warning(inode->i_sb,
80 "pinning inode %lu because the "
Alexey Dobriyan533221f2006-11-25 11:09:30 -080081 "preallocation can't be freed",
82 inode->i_ino);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070083 goto out;
84 }
85 }
86 reiserfs_update_inode_transaction(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
88#ifdef REISERFS_PREALLOCATE
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070089 reiserfs_discard_prealloc(&th, inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070090#endif
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070091 err = journal_end(&th, inode->i_sb, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070093 /* copy back the error code from journal_begin */
94 if (!err)
95 err = jbegin_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -070096
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070097 if (!err && atomic_read(&inode->i_count) <= 1 &&
98 (REISERFS_I(inode)->i_flags & i_pack_on_close_mask) &&
99 tail_has_to_be_packed(inode)) {
100 /* if regular file is released by last holder and it has been
101 appended (we append by unformatted node only) or its direct
102 item(s) had to be converted, then it may have to be
103 indirect2direct converted */
104 err = reiserfs_truncate_file(inode, 0);
105 }
106 out:
Vladimir Savelievde145692007-01-22 20:40:46 -0800107 mutex_unlock(&(REISERFS_I(inode)->i_mmap));
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800108 mutex_unlock(&inode->i_mutex);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700109 reiserfs_write_unlock(inode->i_sb);
110 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111}
112
Vladimir Savelievde145692007-01-22 20:40:46 -0800113static int reiserfs_file_mmap(struct file *file, struct vm_area_struct *vma)
114{
115 struct inode *inode;
116
117 inode = file->f_path.dentry->d_inode;
118 mutex_lock(&(REISERFS_I(inode)->i_mmap));
119 REISERFS_I(inode)->i_flags |= i_ever_mapped;
120 mutex_unlock(&(REISERFS_I(inode)->i_mmap));
121
122 return generic_file_mmap(file, vma);
123}
124
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700125static void reiserfs_vfs_truncate_file(struct inode *inode)
126{
127 reiserfs_truncate_file(inode, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128}
129
130/* Sync a reiserfs file. */
131
132/*
133 * FIXME: sync_mapping_buffers() never has anything to sync. Can
134 * be removed...
135 */
136
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700137static int reiserfs_sync_file(struct file *p_s_filp,
138 struct dentry *p_s_dentry, int datasync)
139{
140 struct inode *p_s_inode = p_s_dentry->d_inode;
141 int n_err;
142 int barrier_done;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
Eric Sesterhenn14a61442006-10-03 23:36:38 +0200144 BUG_ON(!S_ISREG(p_s_inode->i_mode));
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700145 n_err = sync_mapping_buffers(p_s_inode->i_mapping);
146 reiserfs_write_lock(p_s_inode->i_sb);
147 barrier_done = reiserfs_commit_for_inode(p_s_inode);
148 reiserfs_write_unlock(p_s_inode->i_sb);
Chris Mason25736b12006-09-29 01:59:54 -0700149 if (barrier_done != 1 && reiserfs_barrier_flush(p_s_inode->i_sb))
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700150 blkdev_issue_flush(p_s_inode->i_sb->s_bdev, NULL);
151 if (barrier_done < 0)
152 return barrier_done;
153 return (n_err < 0) ? -EIO : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154}
155
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156/* taken fs/buffer.c:__block_commit_write */
157int reiserfs_commit_page(struct inode *inode, struct page *page,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700158 unsigned from, unsigned to)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700160 unsigned block_start, block_end;
161 int partial = 0;
162 unsigned blocksize;
163 struct buffer_head *bh, *head;
164 unsigned long i_size_index = inode->i_size >> PAGE_CACHE_SHIFT;
165 int new;
166 int logit = reiserfs_file_data_log(inode);
167 struct super_block *s = inode->i_sb;
168 int bh_per_page = PAGE_CACHE_SIZE / s->s_blocksize;
169 struct reiserfs_transaction_handle th;
170 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700172 th.t_trans_id = 0;
173 blocksize = 1 << inode->i_blkbits;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700175 if (logit) {
176 reiserfs_write_lock(s);
177 ret = journal_begin(&th, s, bh_per_page + 1);
178 if (ret)
179 goto drop_write_lock;
180 reiserfs_update_inode_transaction(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700182 for (bh = head = page_buffers(page), block_start = 0;
183 bh != head || !block_start;
184 block_start = block_end, bh = bh->b_this_page) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700186 new = buffer_new(bh);
187 clear_buffer_new(bh);
188 block_end = block_start + blocksize;
189 if (block_end <= from || block_start >= to) {
190 if (!buffer_uptodate(bh))
191 partial = 1;
192 } else {
193 set_buffer_uptodate(bh);
194 if (logit) {
195 reiserfs_prepare_for_journal(s, bh, 1);
196 journal_mark_dirty(&th, s, bh);
197 } else if (!buffer_dirty(bh)) {
198 mark_buffer_dirty(bh);
199 /* do data=ordered on any page past the end
200 * of file and any buffer marked BH_New.
201 */
202 if (reiserfs_data_ordered(inode->i_sb) &&
203 (new || page->index >= i_size_index)) {
204 reiserfs_add_ordered_list(inode, bh);
205 }
206 }
207 }
208 }
209 if (logit) {
210 ret = journal_end(&th, s, bh_per_page + 1);
211 drop_write_lock:
212 reiserfs_write_unlock(s);
213 }
214 /*
215 * If this is a partial write which happened to make all buffers
216 * uptodate then we can optimize away a bogus readpage() for
217 * the next read(). Here we 'discover' whether the page went
218 * uptodate as a result of this (potentially partial) write.
219 */
220 if (!partial)
221 SetPageUptodate(page);
222 return ret;
223}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225/* Write @count bytes at position @ppos in a file indicated by @file
226 from the buffer @buf.
227
228 generic_file_write() is only appropriate for filesystems that are not seeking to optimize performance and want
229 something simple that works. It is not for serious use by general purpose filesystems, excepting the one that it was
230 written for (ext2/3). This is for several reasons:
231
232 * It has no understanding of any filesystem specific optimizations.
233
234 * It enters the filesystem repeatedly for each page that is written.
235
236 * It depends on reiserfs_get_block() function which if implemented by reiserfs performs costly search_by_key
237 * operation for each page it is supplied with. By contrast reiserfs_file_write() feeds as much as possible at a time
238 * to reiserfs which allows for fewer tree traversals.
239
240 * Each indirect pointer insertion takes a lot of cpu, because it involves memory moves inside of blocks.
241
242 * Asking the block allocation code for blocks one at a time is slightly less efficient.
243
244 All of these reasons for not using only generic file write were understood back when reiserfs was first miscoded to
245 use it, but we were in a hurry to make code freeze, and so it couldn't be revised then. This new code should make
246 things right finally.
247
248 Future Features: providing search_by_key with hints.
249
250*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700251static ssize_t reiserfs_file_write(struct file *file, /* the file we are going to write into */
252 const char __user * buf, /* pointer to user supplied data
253 (in userspace) */
254 size_t count, /* amount of bytes to write */
255 loff_t * ppos /* pointer to position in file that we start writing at. Should be updated to
256 * new current position before returning. */
257 )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258{
Josef Sipek1fc5adb2006-12-08 02:37:33 -0800259 struct inode *inode = file->f_path.dentry->d_inode; // Inode of the file that we are writing to.
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700260 /* To simplify coding at this time, we store
261 locked pages in array for now */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700262 struct reiserfs_transaction_handle th;
263 th.t_trans_id = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264
Jeff Mahoneyfa385be2006-02-01 03:06:51 -0800265 /* If a filesystem is converted from 3.5 to 3.6, we'll have v3.5 items
266 * lying around (most of the disk, in fact). Despite the filesystem
267 * now being a v3.6 format, the old items still can't support large
268 * file sizes. Catch this case here, as the rest of the VFS layer is
269 * oblivious to the different limitations between old and new items.
270 * reiserfs_setattr catches this for truncates. This chunk is lifted
271 * from generic_write_checks. */
272 if (get_inode_item_key_version (inode) == KEY_FORMAT_3_5 &&
273 *ppos + count > MAX_NON_LFS) {
274 if (*ppos >= MAX_NON_LFS) {
Jeff Mahoneyfa385be2006-02-01 03:06:51 -0800275 return -EFBIG;
276 }
277 if (count > MAX_NON_LFS - (unsigned long)*ppos)
278 count = MAX_NON_LFS - (unsigned long)*ppos;
279 }
280
Vladimir Saveliev797b4cf2007-10-16 01:25:12 -0700281 return do_sync_write(file, buf, count, ppos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282}
283
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800284const struct file_operations reiserfs_file_operations = {
Badari Pulavarty027445c2006-09-30 23:28:46 -0700285 .read = do_sync_read,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700286 .write = reiserfs_file_write,
287 .ioctl = reiserfs_ioctl,
David Howells52b499c2006-08-29 19:06:18 +0100288#ifdef CONFIG_COMPAT
289 .compat_ioctl = reiserfs_compat_ioctl,
290#endif
Vladimir Savelievde145692007-01-22 20:40:46 -0800291 .mmap = reiserfs_file_mmap,
Jeff Mahoney5a2618e2006-09-30 23:28:44 -0700292 .open = generic_file_open,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700293 .release = reiserfs_file_release,
294 .fsync = reiserfs_sync_file,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700295 .aio_read = generic_file_aio_read,
Alexey Dobriyan9637f282006-06-26 00:24:57 -0700296 .aio_write = generic_file_aio_write,
Jens Axboe5274f052006-03-30 15:15:30 +0200297 .splice_read = generic_file_splice_read,
298 .splice_write = generic_file_splice_write,
Christoph Hellwig91efc162008-09-08 19:42:50 +0200299 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300};
301
Arjan van de Venc5ef1c42007-02-12 00:55:40 -0800302const struct inode_operations reiserfs_file_inode_operations = {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700303 .truncate = reiserfs_vfs_truncate_file,
304 .setattr = reiserfs_setattr,
305 .setxattr = reiserfs_setxattr,
306 .getxattr = reiserfs_getxattr,
307 .listxattr = reiserfs_listxattr,
308 .removexattr = reiserfs_removexattr,
309 .permission = reiserfs_permission,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310};