blob: 192269698a8ac44b3b7c58a327d7fde6d35db375 [file] [log] [blame]
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/fs.h>
7#include <linux/reiserfs_fs.h>
8#include <linux/reiserfs_acl.h>
9#include <linux/reiserfs_xattr.h>
Christoph Hellwiga5694252007-07-17 04:04:28 -070010#include <linux/exportfs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/smp_lock.h>
12#include <linux/pagemap.h>
13#include <linux/highmem.h>
14#include <asm/uaccess.h>
15#include <asm/unaligned.h>
16#include <linux/buffer_head.h>
17#include <linux/mpage.h>
18#include <linux/writeback.h>
19#include <linux/quotaops.h>
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -070020#include <linux/swap.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -070022int reiserfs_commit_write(struct file *f, struct page *page,
23 unsigned from, unsigned to);
24int reiserfs_prepare_write(struct file *f, struct page *page,
25 unsigned from, unsigned to);
Linus Torvalds1da177e2005-04-16 15:20:36 -070026
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070027void reiserfs_delete_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -070028{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070029 /* We need blocks for transaction + (user+group) quota update (possibly delete) */
30 int jbegin_count =
31 JOURNAL_PER_BALANCE_CNT * 2 +
32 2 * REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb);
33 struct reiserfs_transaction_handle th;
Jeff Mahoney24996042005-12-14 14:38:05 -050034 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
Mark Fashehfef26652005-09-09 13:01:31 -070036 truncate_inode_pages(&inode->i_data, 0);
37
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070038 reiserfs_write_lock(inode->i_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070040 /* The = 0 happens when we abort creating a new inode for some reason like lack of space.. */
41 if (!(inode->i_state & I_NEW) && INODE_PKEY(inode)->k_objectid != 0) { /* also handles bad_inode case */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070042 reiserfs_delete_xattrs(inode);
43
Alexander Zarochentsevb0b33de2006-08-05 12:14:01 -070044 if (journal_begin(&th, inode->i_sb, jbegin_count))
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070045 goto out;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070046 reiserfs_update_inode_transaction(inode);
47
Jeff Mahoneyeb35c212008-07-08 14:37:06 -040048 reiserfs_discard_prealloc(&th, inode);
49
Jeff Mahoney24996042005-12-14 14:38:05 -050050 err = reiserfs_delete_object(&th, inode);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070051
52 /* Do quota update inside a transaction for journaled quotas. We must do that
53 * after delete_object so that quota updates go into the same transaction as
54 * stat data deletion */
Jeff Mahoney24996042005-12-14 14:38:05 -050055 if (!err)
56 DQUOT_FREE_INODE(inode);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070057
Alexander Zarochentsevb0b33de2006-08-05 12:14:01 -070058 if (journal_end(&th, inode->i_sb, jbegin_count))
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070059 goto out;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070060
Jeff Mahoney24996042005-12-14 14:38:05 -050061 /* check return value from reiserfs_delete_object after
62 * ending the transaction
63 */
64 if (err)
65 goto out;
66
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070067 /* all items of file are deleted, so we can remove "save" link */
68 remove_save_link(inode, 0 /* not truncate */ ); /* we can't do anything
69 * about an error here */
70 } else {
71 /* no object items are in the tree */
72 ;
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070074 out:
75 clear_inode(inode); /* note this must go after the journal_end to prevent deadlock */
76 inode->i_blocks = 0;
77 reiserfs_write_unlock(inode->i_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078}
79
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070080static void _make_cpu_key(struct cpu_key *key, int version, __u32 dirid,
81 __u32 objectid, loff_t offset, int type, int length)
Linus Torvalds1da177e2005-04-16 15:20:36 -070082{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070083 key->version = version;
Linus Torvalds1da177e2005-04-16 15:20:36 -070084
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070085 key->on_disk_key.k_dir_id = dirid;
86 key->on_disk_key.k_objectid = objectid;
87 set_cpu_key_k_offset(key, offset);
88 set_cpu_key_k_type(key, type);
89 key->key_length = length;
Linus Torvalds1da177e2005-04-16 15:20:36 -070090}
91
Linus Torvalds1da177e2005-04-16 15:20:36 -070092/* take base of inode_key (it comes from inode always) (dirid, objectid) and version from an inode, set
93 offset and type of key */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070094void make_cpu_key(struct cpu_key *key, struct inode *inode, loff_t offset,
95 int type, int length)
Linus Torvalds1da177e2005-04-16 15:20:36 -070096{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070097 _make_cpu_key(key, get_inode_item_key_version(inode),
98 le32_to_cpu(INODE_PKEY(inode)->k_dir_id),
99 le32_to_cpu(INODE_PKEY(inode)->k_objectid), offset, type,
100 length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101}
102
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103//
104// when key is 0, do not set version and short key
105//
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700106inline void make_le_item_head(struct item_head *ih, const struct cpu_key *key,
107 int version,
108 loff_t offset, int type, int length,
109 int entry_count /*or ih_free_space */ )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700111 if (key) {
112 ih->ih_key.k_dir_id = cpu_to_le32(key->on_disk_key.k_dir_id);
113 ih->ih_key.k_objectid =
114 cpu_to_le32(key->on_disk_key.k_objectid);
115 }
116 put_ih_version(ih, version);
117 set_le_ih_k_offset(ih, offset);
118 set_le_ih_k_type(ih, type);
119 put_ih_item_len(ih, length);
120 /* set_ih_free_space (ih, 0); */
121 // for directory items it is entry count, for directs and stat
122 // datas - 0xffff, for indirects - 0
123 put_ih_entry_count(ih, entry_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124}
125
126//
127// FIXME: we might cache recently accessed indirect item
128
129// Ugh. Not too eager for that....
130// I cut the code until such time as I see a convincing argument (benchmark).
131// I don't want a bloated inode struct..., and I don't like code complexity....
132
133/* cutting the code is fine, since it really isn't in use yet and is easy
134** to add back in. But, Vladimir has a really good idea here. Think
135** about what happens for reading a file. For each page,
136** The VFS layer calls reiserfs_readpage, who searches the tree to find
137** an indirect item. This indirect item has X number of pointers, where
138** X is a big number if we've done the block allocation right. But,
139** we only use one or two of these pointers during each call to readpage,
140** needlessly researching again later on.
141**
142** The size of the cache could be dynamic based on the size of the file.
143**
144** I'd also like to see us cache the location the stat data item, since
145** we are needlessly researching for that frequently.
146**
147** --chris
148*/
149
150/* If this page has a file tail in it, and
151** it was read in by get_block_create_0, the page data is valid,
152** but tail is still sitting in a direct item, and we can't write to
153** it. So, look through this page, and check all the mapped buffers
154** to make sure they have valid block numbers. Any that don't need
155** to be unmapped, so that block_prepare_write will correctly call
156** reiserfs_get_block to convert the tail into an unformatted node
157*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700158static inline void fix_tail_page_for_writing(struct page *page)
159{
160 struct buffer_head *head, *next, *bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700162 if (page && page_has_buffers(page)) {
163 head = page_buffers(page);
164 bh = head;
165 do {
166 next = bh->b_this_page;
167 if (buffer_mapped(bh) && bh->b_blocknr == 0) {
168 reiserfs_unmap_buffer(bh);
169 }
170 bh = next;
171 } while (bh != head);
172 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173}
174
175/* reiserfs_get_block does not need to allocate a block only if it has been
176 done already or non-hole position has been found in the indirect item */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700177static inline int allocation_needed(int retval, b_blocknr_t allocated,
178 struct item_head *ih,
179 __le32 * item, int pos_in_item)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700181 if (allocated)
182 return 0;
183 if (retval == POSITION_FOUND && is_indirect_le_ih(ih) &&
184 get_block_num(item, pos_in_item))
185 return 0;
186 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187}
188
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700189static inline int indirect_item_found(int retval, struct item_head *ih)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700191 return (retval == POSITION_FOUND) && is_indirect_le_ih(ih);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192}
193
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700194static inline void set_block_dev_mapped(struct buffer_head *bh,
195 b_blocknr_t block, struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196{
197 map_bh(bh, inode->i_sb, block);
198}
199
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200//
201// files which were created in the earlier version can not be longer,
202// than 2 gb
203//
Jeff Mahoney3ee16672007-10-18 23:39:25 -0700204static int file_capable(struct inode *inode, sector_t block)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700206 if (get_inode_item_key_version(inode) != KEY_FORMAT_3_5 || // it is new file.
207 block < (1 << (31 - inode->i_sb->s_blocksize_bits))) // old file, but 'block' is inside of 2gb
208 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700210 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211}
212
Adrian Bunkdeba0f42007-10-16 23:26:03 -0700213static int restart_transaction(struct reiserfs_transaction_handle *th,
214 struct inode *inode, struct treepath *path)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700215{
216 struct super_block *s = th->t_super;
217 int len = th->t_blocks_allocated;
218 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700220 BUG_ON(!th->t_trans_id);
221 BUG_ON(!th->t_refcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222
Suzuki K P87b41262006-12-06 20:36:10 -0800223 pathrelse(path);
224
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700225 /* we cannot restart while nested */
226 if (th->t_refcount > 1) {
227 return 0;
228 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700229 reiserfs_update_sd(th, inode);
230 err = journal_end(th, s, len);
231 if (!err) {
232 err = journal_begin(th, s, JOURNAL_PER_BALANCE_CNT * 6);
233 if (!err)
234 reiserfs_update_inode_transaction(inode);
235 }
236 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237}
238
239// it is called by get_block when create == 0. Returns block number
240// for 'block'-th logical block of file. When it hits direct item it
241// returns 0 (being called from bmap) or read direct item into piece
242// of page (bh_result)
243
244// Please improve the english/clarity in the comment above, as it is
245// hard to understand.
246
Jeff Mahoney3ee16672007-10-18 23:39:25 -0700247static int _get_block_create_0(struct inode *inode, sector_t block,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700248 struct buffer_head *bh_result, int args)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700250 INITIALIZE_PATH(path);
251 struct cpu_key key;
252 struct buffer_head *bh;
253 struct item_head *ih, tmp_ih;
254 int fs_gen;
Jeff Mahoney3ee16672007-10-18 23:39:25 -0700255 b_blocknr_t blocknr;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700256 char *p = NULL;
257 int chars;
258 int ret;
259 int result;
260 int done = 0;
261 unsigned long offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700263 // prepare the key to look for the 'block'-th block of file
264 make_cpu_key(&key, inode,
265 (loff_t) block * inode->i_sb->s_blocksize + 1, TYPE_ANY,
266 3);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700268 research:
269 result = search_for_position_by_key(inode->i_sb, &key, &path);
270 if (result != POSITION_FOUND) {
271 pathrelse(&path);
272 if (p)
273 kunmap(bh_result->b_page);
274 if (result == IO_ERROR)
275 return -EIO;
276 // We do not return -ENOENT if there is a hole but page is uptodate, because it means
277 // That there is some MMAPED data associated with it that is yet to be written to disk.
278 if ((args & GET_BLOCK_NO_HOLE)
279 && !PageUptodate(bh_result->b_page)) {
280 return -ENOENT;
281 }
282 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700284 //
285 bh = get_last_bh(&path);
286 ih = get_ih(&path);
287 if (is_indirect_le_ih(ih)) {
288 __le32 *ind_item = (__le32 *) B_I_PITEM(bh, ih);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700290 /* FIXME: here we could cache indirect item or part of it in
291 the inode to avoid search_by_key in case of subsequent
292 access to file */
293 blocknr = get_block_num(ind_item, path.pos_in_item);
294 ret = 0;
295 if (blocknr) {
296 map_bh(bh_result, inode->i_sb, blocknr);
297 if (path.pos_in_item ==
298 ((ih_item_len(ih) / UNFM_P_SIZE) - 1)) {
299 set_buffer_boundary(bh_result);
300 }
301 } else
302 // We do not return -ENOENT if there is a hole but page is uptodate, because it means
303 // That there is some MMAPED data associated with it that is yet to be written to disk.
304 if ((args & GET_BLOCK_NO_HOLE)
305 && !PageUptodate(bh_result->b_page)) {
306 ret = -ENOENT;
307 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700309 pathrelse(&path);
310 if (p)
311 kunmap(bh_result->b_page);
312 return ret;
313 }
314 // requested data are in direct item(s)
315 if (!(args & GET_BLOCK_READ_DIRECT)) {
316 // we are called by bmap. FIXME: we can not map block of file
317 // when it is stored in direct item(s)
318 pathrelse(&path);
319 if (p)
320 kunmap(bh_result->b_page);
321 return -ENOENT;
322 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700324 /* if we've got a direct item, and the buffer or page was uptodate,
325 ** we don't want to pull data off disk again. skip to the
326 ** end, where we map the buffer and return
327 */
328 if (buffer_uptodate(bh_result)) {
329 goto finished;
330 } else
331 /*
332 ** grab_tail_page can trigger calls to reiserfs_get_block on up to date
333 ** pages without any buffers. If the page is up to date, we don't want
334 ** read old data off disk. Set the up to date bit on the buffer instead
335 ** and jump to the end
336 */
337 if (!bh_result->b_page || PageUptodate(bh_result->b_page)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 set_buffer_uptodate(bh_result);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700339 goto finished;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700341 // read file tail into part of page
342 offset = (cpu_key_k_offset(&key) - 1) & (PAGE_CACHE_SIZE - 1);
343 fs_gen = get_generation(inode->i_sb);
344 copy_item_head(&tmp_ih, ih);
345
346 /* we only want to kmap if we are reading the tail into the page.
347 ** this is not the common case, so we don't kmap until we are
348 ** sure we need to. But, this means the item might move if
349 ** kmap schedules
350 */
351 if (!p) {
352 p = (char *)kmap(bh_result->b_page);
353 if (fs_changed(fs_gen, inode->i_sb)
354 && item_moved(&tmp_ih, &path)) {
355 goto research;
356 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700358 p += offset;
359 memset(p, 0, inode->i_sb->s_blocksize);
360 do {
361 if (!is_direct_le_ih(ih)) {
362 BUG();
363 }
364 /* make sure we don't read more bytes than actually exist in
365 ** the file. This can happen in odd cases where i_size isn't
366 ** correct, and when direct item padding results in a few
367 ** extra bytes at the end of the direct item
368 */
369 if ((le_ih_k_offset(ih) + path.pos_in_item) > inode->i_size)
370 break;
371 if ((le_ih_k_offset(ih) - 1 + ih_item_len(ih)) > inode->i_size) {
372 chars =
373 inode->i_size - (le_ih_k_offset(ih) - 1) -
374 path.pos_in_item;
375 done = 1;
376 } else {
377 chars = ih_item_len(ih) - path.pos_in_item;
378 }
379 memcpy(p, B_I_PITEM(bh, ih) + path.pos_in_item, chars);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700381 if (done)
382 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700384 p += chars;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700386 if (PATH_LAST_POSITION(&path) != (B_NR_ITEMS(bh) - 1))
387 // we done, if read direct item is not the last item of
388 // node FIXME: we could try to check right delimiting key
389 // to see whether direct item continues in the right
390 // neighbor or rely on i_size
391 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700393 // update key to look for the next piece
394 set_cpu_key_k_offset(&key, cpu_key_k_offset(&key) + chars);
395 result = search_for_position_by_key(inode->i_sb, &key, &path);
396 if (result != POSITION_FOUND)
397 // i/o error most likely
398 break;
399 bh = get_last_bh(&path);
400 ih = get_ih(&path);
401 } while (1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700403 flush_dcache_page(bh_result->b_page);
404 kunmap(bh_result->b_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700406 finished:
407 pathrelse(&path);
Qu Fuping6283d582005-06-25 14:55:44 -0700408
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700409 if (result == IO_ERROR)
410 return -EIO;
Qu Fuping6283d582005-06-25 14:55:44 -0700411
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700412 /* this buffer has valid data, but isn't valid for io. mapping it to
413 * block #0 tells the rest of reiserfs it just has a tail in it
414 */
415 map_bh(bh_result, inode->i_sb, 0);
416 set_buffer_uptodate(bh_result);
417 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418}
419
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420// this is called to create file map. So, _get_block_create_0 will not
421// read direct item
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700422static int reiserfs_bmap(struct inode *inode, sector_t block,
423 struct buffer_head *bh_result, int create)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700425 if (!file_capable(inode, block))
426 return -EFBIG;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700428 reiserfs_write_lock(inode->i_sb);
429 /* do not read the direct item */
430 _get_block_create_0(inode, block, bh_result, 0);
431 reiserfs_write_unlock(inode->i_sb);
432 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433}
434
435/* special version of get_block that is only used by grab_tail_page right
436** now. It is sent to block_prepare_write, and when you try to get a
437** block past the end of the file (or a block from a hole) it returns
438** -ENOENT instead of a valid buffer. block_prepare_write expects to
439** be able to do i/o on the buffers returned, unless an error value
440** is also returned.
441**
442** So, this allows block_prepare_write to be used for reading a single block
443** in a page. Where it does not produce a valid page for holes, or past the
444** end of the file. This turns out to be exactly what we need for reading
445** tails for conversion.
446**
447** The point of the wrapper is forcing a certain value for create, even
448** though the VFS layer is calling this function with create==1. If you
449** don't want to send create == GET_BLOCK_NO_HOLE to reiserfs_get_block,
450** don't use this function.
451*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700452static int reiserfs_get_block_create_0(struct inode *inode, sector_t block,
453 struct buffer_head *bh_result,
454 int create)
455{
456 return reiserfs_get_block(inode, block, bh_result, GET_BLOCK_NO_HOLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457}
458
459/* This is special helper for reiserfs_get_block in case we are executing
460 direct_IO request. */
461static int reiserfs_get_blocks_direct_io(struct inode *inode,
462 sector_t iblock,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 struct buffer_head *bh_result,
464 int create)
465{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700466 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700468 bh_result->b_page = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700470 /* We set the b_size before reiserfs_get_block call since it is
471 referenced in convert_tail_for_hole() that may be called from
472 reiserfs_get_block() */
473 bh_result->b_size = (1 << inode->i_blkbits);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700475 ret = reiserfs_get_block(inode, iblock, bh_result,
476 create | GET_BLOCK_NO_DANGLE);
477 if (ret)
478 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700480 /* don't allow direct io onto tail pages */
481 if (buffer_mapped(bh_result) && bh_result->b_blocknr == 0) {
482 /* make sure future calls to the direct io funcs for this offset
483 ** in the file fail by unmapping the buffer
484 */
485 clear_buffer_mapped(bh_result);
486 ret = -EINVAL;
487 }
488 /* Possible unpacked tail. Flush the data before pages have
489 disappeared */
490 if (REISERFS_I(inode)->i_flags & i_pack_on_close_mask) {
491 int err;
492 lock_kernel();
493 err = reiserfs_commit_for_inode(inode);
494 REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask;
495 unlock_kernel();
496 if (err < 0)
497 ret = err;
498 }
499 out:
500 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501}
502
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503/*
504** helper function for when reiserfs_get_block is called for a hole
505** but the file tail is still in a direct item
506** bh_result is the buffer head for the hole
507** tail_offset is the offset of the start of the tail in the file
508**
509** This calls prepare_write, which will start a new transaction
510** you should not be in a transaction, or have any paths held when you
511** call this.
512*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700513static int convert_tail_for_hole(struct inode *inode,
514 struct buffer_head *bh_result,
515 loff_t tail_offset)
516{
517 unsigned long index;
518 unsigned long tail_end;
519 unsigned long tail_start;
520 struct page *tail_page;
521 struct page *hole_page = bh_result->b_page;
522 int retval = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700524 if ((tail_offset & (bh_result->b_size - 1)) != 1)
525 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700527 /* always try to read until the end of the block */
528 tail_start = tail_offset & (PAGE_CACHE_SIZE - 1);
529 tail_end = (tail_start | (bh_result->b_size - 1)) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700531 index = tail_offset >> PAGE_CACHE_SHIFT;
532 /* hole_page can be zero in case of direct_io, we are sure
533 that we cannot get here if we write with O_DIRECT into
534 tail page */
535 if (!hole_page || index != hole_page->index) {
536 tail_page = grab_cache_page(inode->i_mapping, index);
537 retval = -ENOMEM;
538 if (!tail_page) {
539 goto out;
540 }
541 } else {
542 tail_page = hole_page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700545 /* we don't have to make sure the conversion did not happen while
546 ** we were locking the page because anyone that could convert
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800547 ** must first take i_mutex.
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700548 **
549 ** We must fix the tail page for writing because it might have buffers
550 ** that are mapped, but have a block number of 0. This indicates tail
551 ** data that has been read directly into the page, and block_prepare_write
552 ** won't trigger a get_block in this case.
553 */
554 fix_tail_page_for_writing(tail_page);
555 retval = reiserfs_prepare_write(NULL, tail_page, tail_start, tail_end);
556 if (retval)
557 goto unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700559 /* tail conversion might change the data in the page */
560 flush_dcache_page(tail_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700562 retval = reiserfs_commit_write(NULL, tail_page, tail_start, tail_end);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700564 unlock:
565 if (tail_page != hole_page) {
566 unlock_page(tail_page);
567 page_cache_release(tail_page);
568 }
569 out:
570 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571}
572
573static inline int _allocate_block(struct reiserfs_transaction_handle *th,
Jeff Mahoney3ee16672007-10-18 23:39:25 -0700574 sector_t block,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700575 struct inode *inode,
576 b_blocknr_t * allocated_block_nr,
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -0800577 struct treepath *path, int flags)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700578{
579 BUG_ON(!th->t_trans_id);
580
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581#ifdef REISERFS_PREALLOCATE
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800582 if (!(flags & GET_BLOCK_NO_IMUX)) {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700583 return reiserfs_new_unf_blocknrs2(th, inode, allocated_block_nr,
584 path, block);
585 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586#endif
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700587 return reiserfs_new_unf_blocknrs(th, inode, allocated_block_nr, path,
588 block);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589}
590
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700591int reiserfs_get_block(struct inode *inode, sector_t block,
592 struct buffer_head *bh_result, int create)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700594 int repeat, retval = 0;
595 b_blocknr_t allocated_block_nr = 0; // b_blocknr_t is (unsigned) 32 bit int
596 INITIALIZE_PATH(path);
597 int pos_in_item;
598 struct cpu_key key;
599 struct buffer_head *bh, *unbh = NULL;
600 struct item_head *ih, tmp_ih;
601 __le32 *item;
602 int done;
603 int fs_gen;
604 struct reiserfs_transaction_handle *th = NULL;
605 /* space reserved in transaction batch:
606 . 3 balancings in direct->indirect conversion
607 . 1 block involved into reiserfs_update_sd()
608 XXX in practically impossible worst case direct2indirect()
609 can incur (much) more than 3 balancings.
610 quota update for user, group */
611 int jbegin_count =
612 JOURNAL_PER_BALANCE_CNT * 3 + 1 +
613 2 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb);
614 int version;
615 int dangle = 1;
616 loff_t new_offset =
617 (((loff_t) block) << inode->i_sb->s_blocksize_bits) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700619 /* bad.... */
620 reiserfs_write_lock(inode->i_sb);
621 version = get_inode_item_key_version(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700623 if (!file_capable(inode, block)) {
624 reiserfs_write_unlock(inode->i_sb);
625 return -EFBIG;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626 }
627
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700628 /* if !create, we aren't changing the FS, so we don't need to
629 ** log anything, so we don't need to start a transaction
630 */
631 if (!(create & GET_BLOCK_CREATE)) {
632 int ret;
633 /* find number of block-th logical block of the file */
634 ret = _get_block_create_0(inode, block, bh_result,
635 create | GET_BLOCK_READ_DIRECT);
636 reiserfs_write_unlock(inode->i_sb);
637 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700639 /*
640 * if we're already in a transaction, make sure to close
641 * any new transactions we start in this func
642 */
643 if ((create & GET_BLOCK_NO_DANGLE) ||
644 reiserfs_transaction_running(inode->i_sb))
645 dangle = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700647 /* If file is of such a size, that it might have a tail and tails are enabled
648 ** we should mark it as possibly needing tail packing on close
649 */
650 if ((have_large_tails(inode->i_sb)
651 && inode->i_size < i_block_size(inode) * 4)
652 || (have_small_tails(inode->i_sb)
653 && inode->i_size < i_block_size(inode)))
654 REISERFS_I(inode)->i_flags |= i_pack_on_close_mask;
655
656 /* set the key of the first byte in the 'block'-th block of file */
657 make_cpu_key(&key, inode, new_offset, TYPE_ANY, 3 /*key length */ );
658 if ((new_offset + inode->i_sb->s_blocksize - 1) > inode->i_size) {
659 start_trans:
660 th = reiserfs_persistent_transaction(inode->i_sb, jbegin_count);
661 if (!th) {
662 retval = -ENOMEM;
663 goto failure;
664 }
665 reiserfs_update_inode_transaction(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700667 research:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700669 retval = search_for_position_by_key(inode->i_sb, &key, &path);
670 if (retval == IO_ERROR) {
671 retval = -EIO;
672 goto failure;
673 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700675 bh = get_last_bh(&path);
676 ih = get_ih(&path);
677 item = get_item(&path);
678 pos_in_item = path.pos_in_item;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700680 fs_gen = get_generation(inode->i_sb);
681 copy_item_head(&tmp_ih, ih);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700683 if (allocation_needed
684 (retval, allocated_block_nr, ih, item, pos_in_item)) {
685 /* we have to allocate block for the unformatted node */
686 if (!th) {
687 pathrelse(&path);
688 goto start_trans;
689 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700691 repeat =
692 _allocate_block(th, block, inode, &allocated_block_nr,
693 &path, create);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700695 if (repeat == NO_DISK_SPACE || repeat == QUOTA_EXCEEDED) {
696 /* restart the transaction to give the journal a chance to free
697 ** some blocks. releases the path, so we have to go back to
698 ** research if we succeed on the second try
699 */
700 SB_JOURNAL(inode->i_sb)->j_next_async_flush = 1;
701 retval = restart_transaction(th, inode, &path);
702 if (retval)
703 goto failure;
704 repeat =
705 _allocate_block(th, block, inode,
706 &allocated_block_nr, NULL, create);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700708 if (repeat != NO_DISK_SPACE && repeat != QUOTA_EXCEEDED) {
709 goto research;
710 }
711 if (repeat == QUOTA_EXCEEDED)
712 retval = -EDQUOT;
713 else
714 retval = -ENOSPC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715 goto failure;
716 }
717
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700718 if (fs_changed(fs_gen, inode->i_sb)
719 && item_moved(&tmp_ih, &path)) {
720 goto research;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700722 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700724 if (indirect_item_found(retval, ih)) {
725 b_blocknr_t unfm_ptr;
726 /* 'block'-th block is in the file already (there is
727 corresponding cell in some indirect item). But it may be
728 zero unformatted node pointer (hole) */
729 unfm_ptr = get_block_num(item, pos_in_item);
730 if (unfm_ptr == 0) {
731 /* use allocated block to plug the hole */
732 reiserfs_prepare_for_journal(inode->i_sb, bh, 1);
733 if (fs_changed(fs_gen, inode->i_sb)
734 && item_moved(&tmp_ih, &path)) {
735 reiserfs_restore_prepared_buffer(inode->i_sb,
736 bh);
737 goto research;
738 }
739 set_buffer_new(bh_result);
740 if (buffer_dirty(bh_result)
741 && reiserfs_data_ordered(inode->i_sb))
742 reiserfs_add_ordered_list(inode, bh_result);
743 put_block_num(item, pos_in_item, allocated_block_nr);
744 unfm_ptr = allocated_block_nr;
745 journal_mark_dirty(th, inode->i_sb, bh);
746 reiserfs_update_sd(th, inode);
747 }
748 set_block_dev_mapped(bh_result, unfm_ptr, inode);
749 pathrelse(&path);
750 retval = 0;
751 if (!dangle && th)
752 retval = reiserfs_end_persistent_transaction(th);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700754 reiserfs_write_unlock(inode->i_sb);
755
756 /* the item was found, so new blocks were not added to the file
757 ** there is no need to make sure the inode is updated with this
758 ** transaction
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700760 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761 }
762
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700763 if (!th) {
764 pathrelse(&path);
765 goto start_trans;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700768 /* desired position is not found or is in the direct item. We have
769 to append file with holes up to 'block'-th block converting
770 direct items to indirect one if necessary */
771 done = 0;
772 do {
773 if (is_statdata_le_ih(ih)) {
774 __le32 unp = 0;
775 struct cpu_key tmp_key;
776
777 /* indirect item has to be inserted */
778 make_le_item_head(&tmp_ih, &key, version, 1,
779 TYPE_INDIRECT, UNFM_P_SIZE,
780 0 /* free_space */ );
781
782 if (cpu_key_k_offset(&key) == 1) {
783 /* we are going to add 'block'-th block to the file. Use
784 allocated block for that */
785 unp = cpu_to_le32(allocated_block_nr);
786 set_block_dev_mapped(bh_result,
787 allocated_block_nr, inode);
788 set_buffer_new(bh_result);
789 done = 1;
790 }
791 tmp_key = key; // ;)
792 set_cpu_key_k_offset(&tmp_key, 1);
793 PATH_LAST_POSITION(&path)++;
794
795 retval =
796 reiserfs_insert_item(th, &path, &tmp_key, &tmp_ih,
797 inode, (char *)&unp);
798 if (retval) {
799 reiserfs_free_block(th, inode,
800 allocated_block_nr, 1);
801 goto failure; // retval == -ENOSPC, -EDQUOT or -EIO or -EEXIST
802 }
803 //mark_tail_converted (inode);
804 } else if (is_direct_le_ih(ih)) {
805 /* direct item has to be converted */
806 loff_t tail_offset;
807
808 tail_offset =
809 ((le_ih_k_offset(ih) -
810 1) & ~(inode->i_sb->s_blocksize - 1)) + 1;
811 if (tail_offset == cpu_key_k_offset(&key)) {
812 /* direct item we just found fits into block we have
813 to map. Convert it into unformatted node: use
814 bh_result for the conversion */
815 set_block_dev_mapped(bh_result,
816 allocated_block_nr, inode);
817 unbh = bh_result;
818 done = 1;
819 } else {
820 /* we have to padd file tail stored in direct item(s)
821 up to block size and convert it to unformatted
822 node. FIXME: this should also get into page cache */
823
824 pathrelse(&path);
825 /*
826 * ugly, but we can only end the transaction if
827 * we aren't nested
828 */
829 BUG_ON(!th->t_refcount);
830 if (th->t_refcount == 1) {
831 retval =
832 reiserfs_end_persistent_transaction
833 (th);
834 th = NULL;
835 if (retval)
836 goto failure;
837 }
838
839 retval =
840 convert_tail_for_hole(inode, bh_result,
841 tail_offset);
842 if (retval) {
843 if (retval != -ENOSPC)
844 reiserfs_warning(inode->i_sb,
845 "clm-6004: convert tail failed inode %lu, error %d",
846 inode->i_ino,
847 retval);
848 if (allocated_block_nr) {
849 /* the bitmap, the super, and the stat data == 3 */
850 if (!th)
851 th = reiserfs_persistent_transaction(inode->i_sb, 3);
852 if (th)
853 reiserfs_free_block(th,
854 inode,
855 allocated_block_nr,
856 1);
857 }
858 goto failure;
859 }
860 goto research;
861 }
862 retval =
863 direct2indirect(th, inode, &path, unbh,
864 tail_offset);
865 if (retval) {
866 reiserfs_unmap_buffer(unbh);
867 reiserfs_free_block(th, inode,
868 allocated_block_nr, 1);
869 goto failure;
870 }
871 /* it is important the set_buffer_uptodate is done after
872 ** the direct2indirect. The buffer might contain valid
873 ** data newer than the data on disk (read by readpage, changed,
874 ** and then sent here by writepage). direct2indirect needs
875 ** to know if unbh was already up to date, so it can decide
876 ** if the data in unbh needs to be replaced with data from
877 ** the disk
878 */
879 set_buffer_uptodate(unbh);
880
881 /* unbh->b_page == NULL in case of DIRECT_IO request, this means
882 buffer will disappear shortly, so it should not be added to
883 */
884 if (unbh->b_page) {
885 /* we've converted the tail, so we must
886 ** flush unbh before the transaction commits
887 */
888 reiserfs_add_tail_list(inode, unbh);
889
890 /* mark it dirty now to prevent commit_write from adding
891 ** this buffer to the inode's dirty buffer list
892 */
893 /*
894 * AKPM: changed __mark_buffer_dirty to mark_buffer_dirty().
895 * It's still atomic, but it sets the page dirty too,
896 * which makes it eligible for writeback at any time by the
897 * VM (which was also the case with __mark_buffer_dirty())
898 */
899 mark_buffer_dirty(unbh);
900 }
901 } else {
902 /* append indirect item with holes if needed, when appending
903 pointer to 'block'-th block use block, which is already
904 allocated */
905 struct cpu_key tmp_key;
906 unp_t unf_single = 0; // We use this in case we need to allocate only
907 // one block which is a fastpath
908 unp_t *un;
909 __u64 max_to_insert =
910 MAX_ITEM_LEN(inode->i_sb->s_blocksize) /
911 UNFM_P_SIZE;
912 __u64 blocks_needed;
913
914 RFALSE(pos_in_item != ih_item_len(ih) / UNFM_P_SIZE,
915 "vs-804: invalid position for append");
916 /* indirect item has to be appended, set up key of that position */
917 make_cpu_key(&tmp_key, inode,
918 le_key_k_offset(version,
919 &(ih->ih_key)) +
920 op_bytes_number(ih,
921 inode->i_sb->s_blocksize),
922 //pos_in_item * inode->i_sb->s_blocksize,
923 TYPE_INDIRECT, 3); // key type is unimportant
924
Vladimir V. Savelievc499ec22006-03-02 02:54:39 -0800925 RFALSE(cpu_key_k_offset(&tmp_key) > cpu_key_k_offset(&key),
926 "green-805: invalid offset");
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700927 blocks_needed =
928 1 +
929 ((cpu_key_k_offset(&key) -
930 cpu_key_k_offset(&tmp_key)) >> inode->i_sb->
931 s_blocksize_bits);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700932
933 if (blocks_needed == 1) {
934 un = &unf_single;
935 } else {
Yan Burman01afb212006-12-06 20:39:01 -0800936 un = kzalloc(min(blocks_needed, max_to_insert) * UNFM_P_SIZE, GFP_ATOMIC); // We need to avoid scheduling.
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700937 if (!un) {
938 un = &unf_single;
939 blocks_needed = 1;
940 max_to_insert = 0;
Yan Burman01afb212006-12-06 20:39:01 -0800941 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700942 }
943 if (blocks_needed <= max_to_insert) {
944 /* we are going to add target block to the file. Use allocated
945 block for that */
946 un[blocks_needed - 1] =
947 cpu_to_le32(allocated_block_nr);
948 set_block_dev_mapped(bh_result,
949 allocated_block_nr, inode);
950 set_buffer_new(bh_result);
951 done = 1;
952 } else {
953 /* paste hole to the indirect item */
954 /* If kmalloc failed, max_to_insert becomes zero and it means we
955 only have space for one block */
956 blocks_needed =
957 max_to_insert ? max_to_insert : 1;
958 }
959 retval =
960 reiserfs_paste_into_item(th, &path, &tmp_key, inode,
961 (char *)un,
962 UNFM_P_SIZE *
963 blocks_needed);
964
965 if (blocks_needed != 1)
966 kfree(un);
967
968 if (retval) {
969 reiserfs_free_block(th, inode,
970 allocated_block_nr, 1);
971 goto failure;
972 }
973 if (!done) {
974 /* We need to mark new file size in case this function will be
975 interrupted/aborted later on. And we may do this only for
976 holes. */
977 inode->i_size +=
978 inode->i_sb->s_blocksize * blocks_needed;
979 }
980 }
981
982 if (done == 1)
983 break;
984
985 /* this loop could log more blocks than we had originally asked
986 ** for. So, we have to allow the transaction to end if it is
987 ** too big or too full. Update the inode so things are
988 ** consistent if we crash before the function returns
989 **
990 ** release the path so that anybody waiting on the path before
991 ** ending their transaction will be able to continue.
992 */
993 if (journal_transaction_should_end(th, th->t_blocks_allocated)) {
994 retval = restart_transaction(th, inode, &path);
995 if (retval)
996 goto failure;
997 }
998 /* inserting indirect pointers for a hole can take a
999 ** long time. reschedule if needed
1000 */
1001 cond_resched();
1002
1003 retval = search_for_position_by_key(inode->i_sb, &key, &path);
1004 if (retval == IO_ERROR) {
1005 retval = -EIO;
1006 goto failure;
1007 }
1008 if (retval == POSITION_FOUND) {
1009 reiserfs_warning(inode->i_sb,
1010 "vs-825: reiserfs_get_block: "
1011 "%K should not be found", &key);
1012 retval = -EEXIST;
1013 if (allocated_block_nr)
1014 reiserfs_free_block(th, inode,
1015 allocated_block_nr, 1);
1016 pathrelse(&path);
1017 goto failure;
1018 }
1019 bh = get_last_bh(&path);
1020 ih = get_ih(&path);
1021 item = get_item(&path);
1022 pos_in_item = path.pos_in_item;
1023 } while (1);
1024
1025 retval = 0;
1026
1027 failure:
1028 if (th && (!dangle || (retval && !th->t_trans_id))) {
1029 int err;
1030 if (th->t_trans_id)
1031 reiserfs_update_sd(th, inode);
1032 err = reiserfs_end_persistent_transaction(th);
1033 if (err)
1034 retval = err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001037 reiserfs_write_unlock(inode->i_sb);
1038 reiserfs_check_path(&path);
1039 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040}
1041
1042static int
1043reiserfs_readpages(struct file *file, struct address_space *mapping,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001044 struct list_head *pages, unsigned nr_pages)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001046 return mpage_readpages(mapping, pages, nr_pages, reiserfs_get_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047}
1048
1049/* Compute real number of used bytes by file
1050 * Following three functions can go away when we'll have enough space in stat item
1051 */
1052static int real_space_diff(struct inode *inode, int sd_size)
1053{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001054 int bytes;
1055 loff_t blocksize = inode->i_sb->s_blocksize;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001057 if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode))
1058 return sd_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001060 /* End of file is also in full block with indirect reference, so round
1061 ** up to the next block.
1062 **
1063 ** there is just no way to know if the tail is actually packed
1064 ** on the file, so we have to assume it isn't. When we pack the
1065 ** tail, we add 4 bytes to pretend there really is an unformatted
1066 ** node pointer
1067 */
1068 bytes =
1069 ((inode->i_size +
1070 (blocksize - 1)) >> inode->i_sb->s_blocksize_bits) * UNFM_P_SIZE +
1071 sd_size;
1072 return bytes;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073}
1074
1075static inline loff_t to_real_used_space(struct inode *inode, ulong blocks,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001076 int sd_size)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001078 if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode)) {
1079 return inode->i_size +
1080 (loff_t) (real_space_diff(inode, sd_size));
1081 }
1082 return ((loff_t) real_space_diff(inode, sd_size)) +
1083 (((loff_t) blocks) << 9);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084}
1085
1086/* Compute number of blocks used by file in ReiserFS counting */
1087static inline ulong to_fake_used_blocks(struct inode *inode, int sd_size)
1088{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001089 loff_t bytes = inode_get_bytes(inode);
1090 loff_t real_space = real_space_diff(inode, sd_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001092 /* keeps fsck and non-quota versions of reiserfs happy */
1093 if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode)) {
1094 bytes += (loff_t) 511;
1095 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001097 /* files from before the quota patch might i_blocks such that
1098 ** bytes < real_space. Deal with that here to prevent it from
1099 ** going negative.
1100 */
1101 if (bytes < real_space)
1102 return 0;
1103 return (bytes - real_space) >> 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104}
1105
1106//
1107// BAD: new directories have stat data of new type and all other items
1108// of old type. Version stored in the inode says about body items, so
1109// in update_stat_data we can not rely on inode, but have to check
1110// item version directly
1111//
1112
1113// called by read_locked_inode
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -08001114static void init_inode(struct inode *inode, struct treepath *path)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001116 struct buffer_head *bh;
1117 struct item_head *ih;
1118 __u32 rdev;
1119 //int version = ITEM_VERSION_1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001121 bh = PATH_PLAST_BUFFER(path);
1122 ih = PATH_PITEM_HEAD(path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001124 copy_key(INODE_PKEY(inode), &(ih->ih_key));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001126 INIT_LIST_HEAD(&(REISERFS_I(inode)->i_prealloc_list));
1127 REISERFS_I(inode)->i_flags = 0;
1128 REISERFS_I(inode)->i_prealloc_block = 0;
1129 REISERFS_I(inode)->i_prealloc_count = 0;
1130 REISERFS_I(inode)->i_trans_id = 0;
1131 REISERFS_I(inode)->i_jl = NULL;
Vladimir Savelievde145692007-01-22 20:40:46 -08001132 mutex_init(&(REISERFS_I(inode)->i_mmap));
Alexey Dobriyancfe14672006-09-29 02:00:00 -07001133 reiserfs_init_acl_access(inode);
1134 reiserfs_init_acl_default(inode);
Alexey Dobriyan068fbb32006-09-29 01:59:58 -07001135 reiserfs_init_xattr_rwsem(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001137 if (stat_data_v1(ih)) {
1138 struct stat_data_v1 *sd =
1139 (struct stat_data_v1 *)B_I_PITEM(bh, ih);
1140 unsigned long blocks;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001142 set_inode_item_key_version(inode, KEY_FORMAT_3_5);
1143 set_inode_sd_version(inode, STAT_DATA_V1);
1144 inode->i_mode = sd_v1_mode(sd);
1145 inode->i_nlink = sd_v1_nlink(sd);
1146 inode->i_uid = sd_v1_uid(sd);
1147 inode->i_gid = sd_v1_gid(sd);
1148 inode->i_size = sd_v1_size(sd);
1149 inode->i_atime.tv_sec = sd_v1_atime(sd);
1150 inode->i_mtime.tv_sec = sd_v1_mtime(sd);
1151 inode->i_ctime.tv_sec = sd_v1_ctime(sd);
1152 inode->i_atime.tv_nsec = 0;
1153 inode->i_ctime.tv_nsec = 0;
1154 inode->i_mtime.tv_nsec = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001156 inode->i_blocks = sd_v1_blocks(sd);
1157 inode->i_generation = le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
1158 blocks = (inode->i_size + 511) >> 9;
1159 blocks = _ROUND_UP(blocks, inode->i_sb->s_blocksize >> 9);
1160 if (inode->i_blocks > blocks) {
1161 // there was a bug in <=3.5.23 when i_blocks could take negative
1162 // values. Starting from 3.5.17 this value could even be stored in
1163 // stat data. For such files we set i_blocks based on file
1164 // size. Just 2 notes: this can be wrong for sparce files. On-disk value will be
1165 // only updated if file's inode will ever change
1166 inode->i_blocks = blocks;
1167 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001169 rdev = sd_v1_rdev(sd);
1170 REISERFS_I(inode)->i_first_direct_byte =
1171 sd_v1_first_direct_byte(sd);
1172 /* an early bug in the quota code can give us an odd number for the
1173 ** block count. This is incorrect, fix it here.
1174 */
1175 if (inode->i_blocks & 1) {
1176 inode->i_blocks++;
1177 }
1178 inode_set_bytes(inode,
1179 to_real_used_space(inode, inode->i_blocks,
1180 SD_V1_SIZE));
1181 /* nopack is initially zero for v1 objects. For v2 objects,
1182 nopack is initialised from sd_attrs */
1183 REISERFS_I(inode)->i_flags &= ~i_nopack_mask;
1184 } else {
1185 // new stat data found, but object may have old items
1186 // (directories and symlinks)
1187 struct stat_data *sd = (struct stat_data *)B_I_PITEM(bh, ih);
1188
1189 inode->i_mode = sd_v2_mode(sd);
1190 inode->i_nlink = sd_v2_nlink(sd);
1191 inode->i_uid = sd_v2_uid(sd);
1192 inode->i_size = sd_v2_size(sd);
1193 inode->i_gid = sd_v2_gid(sd);
1194 inode->i_mtime.tv_sec = sd_v2_mtime(sd);
1195 inode->i_atime.tv_sec = sd_v2_atime(sd);
1196 inode->i_ctime.tv_sec = sd_v2_ctime(sd);
1197 inode->i_ctime.tv_nsec = 0;
1198 inode->i_mtime.tv_nsec = 0;
1199 inode->i_atime.tv_nsec = 0;
1200 inode->i_blocks = sd_v2_blocks(sd);
1201 rdev = sd_v2_rdev(sd);
1202 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
1203 inode->i_generation =
1204 le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
1205 else
1206 inode->i_generation = sd_v2_generation(sd);
1207
1208 if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
1209 set_inode_item_key_version(inode, KEY_FORMAT_3_5);
1210 else
1211 set_inode_item_key_version(inode, KEY_FORMAT_3_6);
1212 REISERFS_I(inode)->i_first_direct_byte = 0;
1213 set_inode_sd_version(inode, STAT_DATA_V2);
1214 inode_set_bytes(inode,
1215 to_real_used_space(inode, inode->i_blocks,
1216 SD_V2_SIZE));
1217 /* read persistent inode attributes from sd and initalise
1218 generic inode flags from them */
1219 REISERFS_I(inode)->i_attrs = sd_v2_attrs(sd);
1220 sd_attrs_to_i_attrs(sd_v2_attrs(sd), inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221 }
1222
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001223 pathrelse(path);
1224 if (S_ISREG(inode->i_mode)) {
1225 inode->i_op = &reiserfs_file_inode_operations;
1226 inode->i_fop = &reiserfs_file_operations;
1227 inode->i_mapping->a_ops = &reiserfs_address_space_operations;
1228 } else if (S_ISDIR(inode->i_mode)) {
1229 inode->i_op = &reiserfs_dir_inode_operations;
1230 inode->i_fop = &reiserfs_dir_operations;
1231 } else if (S_ISLNK(inode->i_mode)) {
1232 inode->i_op = &reiserfs_symlink_inode_operations;
1233 inode->i_mapping->a_ops = &reiserfs_address_space_operations;
1234 } else {
1235 inode->i_blocks = 0;
1236 inode->i_op = &reiserfs_special_inode_operations;
1237 init_special_inode(inode, inode->i_mode, new_decode_dev(rdev));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239}
1240
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241// update new stat data with inode fields
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001242static void inode2sd(void *sd, struct inode *inode, loff_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001244 struct stat_data *sd_v2 = (struct stat_data *)sd;
1245 __u16 flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001246
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001247 set_sd_v2_mode(sd_v2, inode->i_mode);
1248 set_sd_v2_nlink(sd_v2, inode->i_nlink);
1249 set_sd_v2_uid(sd_v2, inode->i_uid);
1250 set_sd_v2_size(sd_v2, size);
1251 set_sd_v2_gid(sd_v2, inode->i_gid);
1252 set_sd_v2_mtime(sd_v2, inode->i_mtime.tv_sec);
1253 set_sd_v2_atime(sd_v2, inode->i_atime.tv_sec);
1254 set_sd_v2_ctime(sd_v2, inode->i_ctime.tv_sec);
1255 set_sd_v2_blocks(sd_v2, to_fake_used_blocks(inode, SD_V2_SIZE));
1256 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
1257 set_sd_v2_rdev(sd_v2, new_encode_dev(inode->i_rdev));
1258 else
1259 set_sd_v2_generation(sd_v2, inode->i_generation);
1260 flags = REISERFS_I(inode)->i_attrs;
1261 i_attrs_to_sd_attrs(inode, &flags);
1262 set_sd_v2_attrs(sd_v2, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001263}
1264
Linus Torvalds1da177e2005-04-16 15:20:36 -07001265// used to copy inode's fields to old stat data
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001266static void inode2sd_v1(void *sd, struct inode *inode, loff_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001267{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001268 struct stat_data_v1 *sd_v1 = (struct stat_data_v1 *)sd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001269
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001270 set_sd_v1_mode(sd_v1, inode->i_mode);
1271 set_sd_v1_uid(sd_v1, inode->i_uid);
1272 set_sd_v1_gid(sd_v1, inode->i_gid);
1273 set_sd_v1_nlink(sd_v1, inode->i_nlink);
1274 set_sd_v1_size(sd_v1, size);
1275 set_sd_v1_atime(sd_v1, inode->i_atime.tv_sec);
1276 set_sd_v1_ctime(sd_v1, inode->i_ctime.tv_sec);
1277 set_sd_v1_mtime(sd_v1, inode->i_mtime.tv_sec);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001278
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001279 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
1280 set_sd_v1_rdev(sd_v1, new_encode_dev(inode->i_rdev));
1281 else
1282 set_sd_v1_blocks(sd_v1, to_fake_used_blocks(inode, SD_V1_SIZE));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001284 // Sigh. i_first_direct_byte is back
1285 set_sd_v1_first_direct_byte(sd_v1,
1286 REISERFS_I(inode)->i_first_direct_byte);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001287}
1288
Linus Torvalds1da177e2005-04-16 15:20:36 -07001289/* NOTE, you must prepare the buffer head before sending it here,
1290** and then log it after the call
1291*/
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -08001292static void update_stat_data(struct treepath *path, struct inode *inode,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001293 loff_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001294{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001295 struct buffer_head *bh;
1296 struct item_head *ih;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001298 bh = PATH_PLAST_BUFFER(path);
1299 ih = PATH_PITEM_HEAD(path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001300
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001301 if (!is_statdata_le_ih(ih))
1302 reiserfs_panic(inode->i_sb,
1303 "vs-13065: update_stat_data: key %k, found item %h",
1304 INODE_PKEY(inode), ih);
1305
1306 if (stat_data_v1(ih)) {
1307 // path points to old stat data
1308 inode2sd_v1(B_I_PITEM(bh, ih), inode, size);
1309 } else {
1310 inode2sd(B_I_PITEM(bh, ih), inode, size);
1311 }
1312
1313 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001314}
1315
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001316void reiserfs_update_sd_size(struct reiserfs_transaction_handle *th,
1317 struct inode *inode, loff_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001318{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001319 struct cpu_key key;
1320 INITIALIZE_PATH(path);
1321 struct buffer_head *bh;
1322 int fs_gen;
1323 struct item_head *ih, tmp_ih;
1324 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001326 BUG_ON(!th->t_trans_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001328 make_cpu_key(&key, inode, SD_OFFSET, TYPE_STAT_DATA, 3); //key type is unimportant
1329
1330 for (;;) {
1331 int pos;
1332 /* look for the object's stat data */
1333 retval = search_item(inode->i_sb, &key, &path);
1334 if (retval == IO_ERROR) {
1335 reiserfs_warning(inode->i_sb,
1336 "vs-13050: reiserfs_update_sd: "
1337 "i/o failure occurred trying to update %K stat data",
1338 &key);
1339 return;
1340 }
1341 if (retval == ITEM_NOT_FOUND) {
1342 pos = PATH_LAST_POSITION(&path);
1343 pathrelse(&path);
1344 if (inode->i_nlink == 0) {
1345 /*reiserfs_warning (inode->i_sb, "vs-13050: reiserfs_update_sd: i_nlink == 0, stat data not found"); */
1346 return;
1347 }
1348 reiserfs_warning(inode->i_sb,
1349 "vs-13060: reiserfs_update_sd: "
1350 "stat data of object %k (nlink == %d) not found (pos %d)",
1351 INODE_PKEY(inode), inode->i_nlink,
1352 pos);
1353 reiserfs_check_path(&path);
1354 return;
1355 }
1356
1357 /* sigh, prepare_for_journal might schedule. When it schedules the
1358 ** FS might change. We have to detect that, and loop back to the
1359 ** search if the stat data item has moved
1360 */
1361 bh = get_last_bh(&path);
1362 ih = get_ih(&path);
1363 copy_item_head(&tmp_ih, ih);
1364 fs_gen = get_generation(inode->i_sb);
1365 reiserfs_prepare_for_journal(inode->i_sb, bh, 1);
1366 if (fs_changed(fs_gen, inode->i_sb)
1367 && item_moved(&tmp_ih, &path)) {
1368 reiserfs_restore_prepared_buffer(inode->i_sb, bh);
1369 continue; /* Stat_data item has been moved after scheduling. */
1370 }
1371 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001373 update_stat_data(&path, inode, size);
1374 journal_mark_dirty(th, th->t_super, bh);
1375 pathrelse(&path);
1376 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001377}
1378
1379/* reiserfs_read_locked_inode is called to read the inode off disk, and it
1380** does a make_bad_inode when things go wrong. But, we need to make sure
1381** and clear the key in the private portion of the inode, otherwise a
1382** corresponding iput might try to delete whatever object the inode last
1383** represented.
1384*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001385static void reiserfs_make_bad_inode(struct inode *inode)
1386{
1387 memset(INODE_PKEY(inode), 0, KEY_SIZE);
1388 make_bad_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001389}
1390
1391//
1392// initially this function was derived from minix or ext2's analog and
1393// evolved as the prototype did
1394//
1395
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001396int reiserfs_init_locked_inode(struct inode *inode, void *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001397{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001398 struct reiserfs_iget_args *args = (struct reiserfs_iget_args *)p;
1399 inode->i_ino = args->objectid;
1400 INODE_PKEY(inode)->k_dir_id = cpu_to_le32(args->dirid);
1401 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001402}
1403
1404/* looks for stat data in the tree, and fills up the fields of in-core
1405 inode stat data fields */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001406void reiserfs_read_locked_inode(struct inode *inode,
1407 struct reiserfs_iget_args *args)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001408{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001409 INITIALIZE_PATH(path_to_sd);
1410 struct cpu_key key;
1411 unsigned long dirino;
1412 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001414 dirino = args->dirid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001415
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001416 /* set version 1, version 2 could be used too, because stat data
1417 key is the same in both versions */
1418 key.version = KEY_FORMAT_3_5;
1419 key.on_disk_key.k_dir_id = dirino;
1420 key.on_disk_key.k_objectid = inode->i_ino;
1421 key.on_disk_key.k_offset = 0;
1422 key.on_disk_key.k_type = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001424 /* look for the object's stat data */
1425 retval = search_item(inode->i_sb, &key, &path_to_sd);
1426 if (retval == IO_ERROR) {
1427 reiserfs_warning(inode->i_sb,
1428 "vs-13070: reiserfs_read_locked_inode: "
1429 "i/o failure occurred trying to find stat data of %K",
1430 &key);
1431 reiserfs_make_bad_inode(inode);
1432 return;
1433 }
1434 if (retval != ITEM_FOUND) {
1435 /* a stale NFS handle can trigger this without it being an error */
1436 pathrelse(&path_to_sd);
1437 reiserfs_make_bad_inode(inode);
1438 inode->i_nlink = 0;
1439 return;
1440 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001441
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001442 init_inode(inode, &path_to_sd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001443
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001444 /* It is possible that knfsd is trying to access inode of a file
1445 that is being removed from the disk by some other thread. As we
1446 update sd on unlink all that is required is to check for nlink
1447 here. This bug was first found by Sizif when debugging
1448 SquidNG/Butterfly, forgotten, and found again after Philippe
1449 Gramoulle <philippe.gramoulle@mmania.com> reproduced it.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001450
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001451 More logical fix would require changes in fs/inode.c:iput() to
1452 remove inode from hash-table _after_ fs cleaned disk stuff up and
1453 in iget() to return NULL if I_FREEING inode is found in
1454 hash-table. */
1455 /* Currently there is one place where it's ok to meet inode with
1456 nlink==0: processing of open-unlinked and half-truncated files
1457 during mount (fs/reiserfs/super.c:finish_unfinished()). */
1458 if ((inode->i_nlink == 0) &&
1459 !REISERFS_SB(inode->i_sb)->s_is_unlinked_ok) {
1460 reiserfs_warning(inode->i_sb,
1461 "vs-13075: reiserfs_read_locked_inode: "
1462 "dead inode read from disk %K. "
1463 "This is likely to be race with knfsd. Ignore",
1464 &key);
1465 reiserfs_make_bad_inode(inode);
1466 }
1467
1468 reiserfs_check_path(&path_to_sd); /* init inode should be relsing */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001469
1470}
1471
1472/**
1473 * reiserfs_find_actor() - "find actor" reiserfs supplies to iget5_locked().
1474 *
1475 * @inode: inode from hash table to check
1476 * @opaque: "cookie" passed to iget5_locked(). This is &reiserfs_iget_args.
1477 *
1478 * This function is called by iget5_locked() to distinguish reiserfs inodes
1479 * having the same inode numbers. Such inodes can only exist due to some
1480 * error condition. One of them should be bad. Inodes with identical
1481 * inode numbers (objectids) are distinguished by parent directory ids.
1482 *
1483 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001484int reiserfs_find_actor(struct inode *inode, void *opaque)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001485{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001486 struct reiserfs_iget_args *args;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001488 args = opaque;
1489 /* args is already in CPU order */
1490 return (inode->i_ino == args->objectid) &&
1491 (le32_to_cpu(INODE_PKEY(inode)->k_dir_id) == args->dirid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492}
1493
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001494struct inode *reiserfs_iget(struct super_block *s, const struct cpu_key *key)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001495{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001496 struct inode *inode;
1497 struct reiserfs_iget_args args;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001498
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001499 args.objectid = key->on_disk_key.k_objectid;
1500 args.dirid = key->on_disk_key.k_dir_id;
1501 inode = iget5_locked(s, key->on_disk_key.k_objectid,
1502 reiserfs_find_actor, reiserfs_init_locked_inode,
1503 (void *)(&args));
1504 if (!inode)
1505 return ERR_PTR(-ENOMEM);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001506
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001507 if (inode->i_state & I_NEW) {
1508 reiserfs_read_locked_inode(inode, &args);
1509 unlock_new_inode(inode);
1510 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001512 if (comp_short_keys(INODE_PKEY(inode), key) || is_bad_inode(inode)) {
1513 /* either due to i/o error or a stale NFS handle */
1514 iput(inode);
1515 inode = NULL;
1516 }
1517 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001518}
1519
Christoph Hellwigbe55caf2007-10-21 16:42:13 -07001520static struct dentry *reiserfs_get_dentry(struct super_block *sb,
1521 u32 objectid, u32 dir_id, u32 generation)
1522
Linus Torvalds1da177e2005-04-16 15:20:36 -07001523{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001524 struct cpu_key key;
1525 struct dentry *result;
1526 struct inode *inode;
1527
Christoph Hellwigbe55caf2007-10-21 16:42:13 -07001528 key.on_disk_key.k_objectid = objectid;
1529 key.on_disk_key.k_dir_id = dir_id;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001530 reiserfs_write_lock(sb);
1531 inode = reiserfs_iget(sb, &key);
Christoph Hellwigbe55caf2007-10-21 16:42:13 -07001532 if (inode && !IS_ERR(inode) && generation != 0 &&
1533 generation != inode->i_generation) {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001534 iput(inode);
1535 inode = NULL;
1536 }
1537 reiserfs_write_unlock(sb);
1538 if (!inode)
1539 inode = ERR_PTR(-ESTALE);
1540 if (IS_ERR(inode))
David Howellse231c2e2008-02-07 00:15:26 -08001541 return ERR_CAST(inode);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001542 result = d_alloc_anon(inode);
1543 if (!result) {
1544 iput(inode);
1545 return ERR_PTR(-ENOMEM);
1546 }
1547 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001548}
1549
Christoph Hellwigbe55caf2007-10-21 16:42:13 -07001550struct dentry *reiserfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
1551 int fh_len, int fh_type)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001552{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001553 /* fhtype happens to reflect the number of u32s encoded.
1554 * due to a bug in earlier code, fhtype might indicate there
1555 * are more u32s then actually fitted.
1556 * so if fhtype seems to be more than len, reduce fhtype.
1557 * Valid types are:
1558 * 2 - objectid + dir_id - legacy support
1559 * 3 - objectid + dir_id + generation
1560 * 4 - objectid + dir_id + objectid and dirid of parent - legacy
1561 * 5 - objectid + dir_id + generation + objectid and dirid of parent
1562 * 6 - as above plus generation of directory
1563 * 6 does not fit in NFSv2 handles
1564 */
Christoph Hellwigbe55caf2007-10-21 16:42:13 -07001565 if (fh_type > fh_len) {
1566 if (fh_type != 6 || fh_len != 5)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001567 reiserfs_warning(sb,
Christoph Hellwigbe55caf2007-10-21 16:42:13 -07001568 "nfsd/reiserfs, fhtype=%d, len=%d - odd",
1569 fh_type, fh_len);
1570 fh_type = 5;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001571 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001572
Christoph Hellwigbe55caf2007-10-21 16:42:13 -07001573 return reiserfs_get_dentry(sb, fid->raw[0], fid->raw[1],
1574 (fh_type == 3 || fh_type >= 5) ? fid->raw[2] : 0);
1575}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001576
Christoph Hellwigbe55caf2007-10-21 16:42:13 -07001577struct dentry *reiserfs_fh_to_parent(struct super_block *sb, struct fid *fid,
1578 int fh_len, int fh_type)
1579{
1580 if (fh_type < 4)
1581 return NULL;
1582
1583 return reiserfs_get_dentry(sb,
1584 (fh_type >= 5) ? fid->raw[3] : fid->raw[2],
1585 (fh_type >= 5) ? fid->raw[4] : fid->raw[3],
1586 (fh_type == 6) ? fid->raw[5] : 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001587}
1588
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001589int reiserfs_encode_fh(struct dentry *dentry, __u32 * data, int *lenp,
1590 int need_parent)
1591{
1592 struct inode *inode = dentry->d_inode;
1593 int maxlen = *lenp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001594
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001595 if (maxlen < 3)
1596 return 255;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001597
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001598 data[0] = inode->i_ino;
1599 data[1] = le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
1600 data[2] = inode->i_generation;
1601 *lenp = 3;
1602 /* no room for directory info? return what we've stored so far */
1603 if (maxlen < 5 || !need_parent)
1604 return 3;
1605
1606 spin_lock(&dentry->d_lock);
1607 inode = dentry->d_parent->d_inode;
1608 data[3] = inode->i_ino;
1609 data[4] = le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
1610 *lenp = 5;
1611 if (maxlen >= 6) {
1612 data[5] = inode->i_generation;
1613 *lenp = 6;
1614 }
1615 spin_unlock(&dentry->d_lock);
1616 return *lenp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001617}
1618
Linus Torvalds1da177e2005-04-16 15:20:36 -07001619/* looks for stat data, then copies fields to it, marks the buffer
1620 containing stat data as dirty */
1621/* reiserfs inodes are never really dirty, since the dirty inode call
1622** always logs them. This call allows the VFS inode marking routines
1623** to properly mark inodes for datasync and such, but only actually
1624** does something when called for a synchronous update.
1625*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001626int reiserfs_write_inode(struct inode *inode, int do_sync)
1627{
1628 struct reiserfs_transaction_handle th;
1629 int jbegin_count = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001630
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001631 if (inode->i_sb->s_flags & MS_RDONLY)
1632 return -EROFS;
1633 /* memory pressure can sometimes initiate write_inode calls with sync == 1,
1634 ** these cases are just when the system needs ram, not when the
1635 ** inode needs to reach disk for safety, and they can safely be
1636 ** ignored because the altered inode has already been logged.
1637 */
1638 if (do_sync && !(current->flags & PF_MEMALLOC)) {
1639 reiserfs_write_lock(inode->i_sb);
1640 if (!journal_begin(&th, inode->i_sb, jbegin_count)) {
1641 reiserfs_update_sd(&th, inode);
1642 journal_end_sync(&th, inode->i_sb, jbegin_count);
1643 }
1644 reiserfs_write_unlock(inode->i_sb);
1645 }
1646 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001647}
1648
1649/* stat data of new object is inserted already, this inserts the item
1650 containing "." and ".." entries */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001651static int reiserfs_new_directory(struct reiserfs_transaction_handle *th,
1652 struct inode *inode,
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -08001653 struct item_head *ih, struct treepath *path,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001654 struct inode *dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001655{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001656 struct super_block *sb = th->t_super;
1657 char empty_dir[EMPTY_DIR_SIZE];
1658 char *body = empty_dir;
1659 struct cpu_key key;
1660 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001661
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001662 BUG_ON(!th->t_trans_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001663
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001664 _make_cpu_key(&key, KEY_FORMAT_3_5, le32_to_cpu(ih->ih_key.k_dir_id),
1665 le32_to_cpu(ih->ih_key.k_objectid), DOT_OFFSET,
1666 TYPE_DIRENTRY, 3 /*key length */ );
1667
1668 /* compose item head for new item. Directories consist of items of
1669 old type (ITEM_VERSION_1). Do not set key (second arg is 0), it
1670 is done by reiserfs_new_inode */
1671 if (old_format_only(sb)) {
1672 make_le_item_head(ih, NULL, KEY_FORMAT_3_5, DOT_OFFSET,
1673 TYPE_DIRENTRY, EMPTY_DIR_SIZE_V1, 2);
1674
1675 make_empty_dir_item_v1(body, ih->ih_key.k_dir_id,
1676 ih->ih_key.k_objectid,
1677 INODE_PKEY(dir)->k_dir_id,
1678 INODE_PKEY(dir)->k_objectid);
1679 } else {
1680 make_le_item_head(ih, NULL, KEY_FORMAT_3_5, DOT_OFFSET,
1681 TYPE_DIRENTRY, EMPTY_DIR_SIZE, 2);
1682
1683 make_empty_dir_item(body, ih->ih_key.k_dir_id,
1684 ih->ih_key.k_objectid,
1685 INODE_PKEY(dir)->k_dir_id,
1686 INODE_PKEY(dir)->k_objectid);
1687 }
1688
1689 /* look for place in the tree for new item */
1690 retval = search_item(sb, &key, path);
1691 if (retval == IO_ERROR) {
1692 reiserfs_warning(sb, "vs-13080: reiserfs_new_directory: "
1693 "i/o failure occurred creating new directory");
1694 return -EIO;
1695 }
1696 if (retval == ITEM_FOUND) {
1697 pathrelse(path);
1698 reiserfs_warning(sb, "vs-13070: reiserfs_new_directory: "
1699 "object with this key exists (%k)",
1700 &(ih->ih_key));
1701 return -EEXIST;
1702 }
1703
1704 /* insert item, that is empty directory item */
1705 return reiserfs_insert_item(th, path, &key, ih, inode, body);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001706}
1707
Linus Torvalds1da177e2005-04-16 15:20:36 -07001708/* stat data of object has been inserted, this inserts the item
1709 containing the body of symlink */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001710static int reiserfs_new_symlink(struct reiserfs_transaction_handle *th, struct inode *inode, /* Inode of symlink */
1711 struct item_head *ih,
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -08001712 struct treepath *path, const char *symname,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001713 int item_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001714{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001715 struct super_block *sb = th->t_super;
1716 struct cpu_key key;
1717 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001718
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001719 BUG_ON(!th->t_trans_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001720
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001721 _make_cpu_key(&key, KEY_FORMAT_3_5,
1722 le32_to_cpu(ih->ih_key.k_dir_id),
1723 le32_to_cpu(ih->ih_key.k_objectid),
1724 1, TYPE_DIRECT, 3 /*key length */ );
Linus Torvalds1da177e2005-04-16 15:20:36 -07001725
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001726 make_le_item_head(ih, NULL, KEY_FORMAT_3_5, 1, TYPE_DIRECT, item_len,
1727 0 /*free_space */ );
Linus Torvalds1da177e2005-04-16 15:20:36 -07001728
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001729 /* look for place in the tree for new item */
1730 retval = search_item(sb, &key, path);
1731 if (retval == IO_ERROR) {
1732 reiserfs_warning(sb, "vs-13080: reiserfs_new_symlinik: "
1733 "i/o failure occurred creating new symlink");
1734 return -EIO;
1735 }
1736 if (retval == ITEM_FOUND) {
1737 pathrelse(path);
1738 reiserfs_warning(sb, "vs-13080: reiserfs_new_symlink: "
1739 "object with this key exists (%k)",
1740 &(ih->ih_key));
1741 return -EEXIST;
1742 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001743
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001744 /* insert item, that is body of symlink */
1745 return reiserfs_insert_item(th, path, &key, ih, inode, symname);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001746}
1747
Linus Torvalds1da177e2005-04-16 15:20:36 -07001748/* inserts the stat data into the tree, and then calls
1749 reiserfs_new_directory (to insert ".", ".." item if new object is
1750 directory) or reiserfs_new_symlink (to insert symlink body if new
1751 object is symlink) or nothing (if new object is regular file)
1752
1753 NOTE! uid and gid must already be set in the inode. If we return
1754 non-zero due to an error, we have to drop the quota previously allocated
1755 for the fresh inode. This can only be done outside a transaction, so
1756 if we return non-zero, we also end the transaction. */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001757int reiserfs_new_inode(struct reiserfs_transaction_handle *th,
1758 struct inode *dir, int mode, const char *symname,
1759 /* 0 for regular, EMTRY_DIR_SIZE for dirs,
1760 strlen (symname) for symlinks) */
1761 loff_t i_size, struct dentry *dentry,
1762 struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001763{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001764 struct super_block *sb;
1765 INITIALIZE_PATH(path_to_key);
1766 struct cpu_key key;
1767 struct item_head ih;
1768 struct stat_data sd;
1769 int retval;
1770 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001771
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001772 BUG_ON(!th->t_trans_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001773
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001774 if (DQUOT_ALLOC_INODE(inode)) {
1775 err = -EDQUOT;
1776 goto out_end_trans;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001777 }
Eric Sesterhenn585b7742006-10-04 02:15:30 -07001778 if (!dir->i_nlink) {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001779 err = -EPERM;
1780 goto out_bad_inode;
1781 }
1782
1783 sb = dir->i_sb;
1784
1785 /* item head of new item */
1786 ih.ih_key.k_dir_id = reiserfs_choose_packing(dir);
1787 ih.ih_key.k_objectid = cpu_to_le32(reiserfs_get_unused_objectid(th));
1788 if (!ih.ih_key.k_objectid) {
1789 err = -ENOMEM;
1790 goto out_bad_inode;
1791 }
1792 if (old_format_only(sb))
1793 /* not a perfect generation count, as object ids can be reused, but
1794 ** this is as good as reiserfs can do right now.
1795 ** note that the private part of inode isn't filled in yet, we have
1796 ** to use the directory.
1797 */
1798 inode->i_generation = le32_to_cpu(INODE_PKEY(dir)->k_objectid);
1799 else
1800#if defined( USE_INODE_GENERATION_COUNTER )
1801 inode->i_generation =
1802 le32_to_cpu(REISERFS_SB(sb)->s_rs->s_inode_generation);
1803#else
1804 inode->i_generation = ++event;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001805#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001806
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001807 /* fill stat data */
1808 inode->i_nlink = (S_ISDIR(mode) ? 2 : 1);
1809
1810 /* uid and gid must already be set by the caller for quota init */
1811
1812 /* symlink cannot be immutable or append only, right? */
1813 if (S_ISLNK(inode->i_mode))
1814 inode->i_flags &= ~(S_IMMUTABLE | S_APPEND);
1815
1816 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
1817 inode->i_size = i_size;
1818 inode->i_blocks = 0;
1819 inode->i_bytes = 0;
1820 REISERFS_I(inode)->i_first_direct_byte = S_ISLNK(mode) ? 1 :
1821 U32_MAX /*NO_BYTES_IN_DIRECT_ITEM */ ;
1822
1823 INIT_LIST_HEAD(&(REISERFS_I(inode)->i_prealloc_list));
1824 REISERFS_I(inode)->i_flags = 0;
1825 REISERFS_I(inode)->i_prealloc_block = 0;
1826 REISERFS_I(inode)->i_prealloc_count = 0;
1827 REISERFS_I(inode)->i_trans_id = 0;
1828 REISERFS_I(inode)->i_jl = NULL;
1829 REISERFS_I(inode)->i_attrs =
1830 REISERFS_I(dir)->i_attrs & REISERFS_INHERIT_MASK;
1831 sd_attrs_to_i_attrs(REISERFS_I(inode)->i_attrs, inode);
Vladimir Savelievde145692007-01-22 20:40:46 -08001832 mutex_init(&(REISERFS_I(inode)->i_mmap));
Alexey Dobriyancfe14672006-09-29 02:00:00 -07001833 reiserfs_init_acl_access(inode);
1834 reiserfs_init_acl_default(inode);
Alexey Dobriyan068fbb32006-09-29 01:59:58 -07001835 reiserfs_init_xattr_rwsem(inode);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001836
1837 if (old_format_only(sb))
1838 make_le_item_head(&ih, NULL, KEY_FORMAT_3_5, SD_OFFSET,
1839 TYPE_STAT_DATA, SD_V1_SIZE, MAX_US_INT);
1840 else
1841 make_le_item_head(&ih, NULL, KEY_FORMAT_3_6, SD_OFFSET,
1842 TYPE_STAT_DATA, SD_SIZE, MAX_US_INT);
1843
1844 /* key to search for correct place for new stat data */
1845 _make_cpu_key(&key, KEY_FORMAT_3_6, le32_to_cpu(ih.ih_key.k_dir_id),
1846 le32_to_cpu(ih.ih_key.k_objectid), SD_OFFSET,
1847 TYPE_STAT_DATA, 3 /*key length */ );
1848
1849 /* find proper place for inserting of stat data */
1850 retval = search_item(sb, &key, &path_to_key);
1851 if (retval == IO_ERROR) {
1852 err = -EIO;
1853 goto out_bad_inode;
1854 }
1855 if (retval == ITEM_FOUND) {
1856 pathrelse(&path_to_key);
1857 err = -EEXIST;
1858 goto out_bad_inode;
1859 }
1860 if (old_format_only(sb)) {
1861 if (inode->i_uid & ~0xffff || inode->i_gid & ~0xffff) {
1862 pathrelse(&path_to_key);
1863 /* i_uid or i_gid is too big to be stored in stat data v3.5 */
1864 err = -EINVAL;
1865 goto out_bad_inode;
1866 }
1867 inode2sd_v1(&sd, inode, inode->i_size);
1868 } else {
1869 inode2sd(&sd, inode, inode->i_size);
1870 }
1871 // these do not go to on-disk stat data
1872 inode->i_ino = le32_to_cpu(ih.ih_key.k_objectid);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001873
1874 // store in in-core inode the key of stat data and version all
1875 // object items will have (directory items will have old offset
1876 // format, other new objects will consist of new items)
1877 memcpy(INODE_PKEY(inode), &(ih.ih_key), KEY_SIZE);
1878 if (old_format_only(sb) || S_ISDIR(mode) || S_ISLNK(mode))
1879 set_inode_item_key_version(inode, KEY_FORMAT_3_5);
1880 else
1881 set_inode_item_key_version(inode, KEY_FORMAT_3_6);
1882 if (old_format_only(sb))
1883 set_inode_sd_version(inode, STAT_DATA_V1);
1884 else
1885 set_inode_sd_version(inode, STAT_DATA_V2);
1886
1887 /* insert the stat data into the tree */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001888#ifdef DISPLACE_NEW_PACKING_LOCALITIES
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001889 if (REISERFS_I(dir)->new_packing_locality)
1890 th->displace_new_blocks = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001891#endif
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001892 retval =
1893 reiserfs_insert_item(th, &path_to_key, &key, &ih, inode,
1894 (char *)(&sd));
1895 if (retval) {
1896 err = retval;
1897 reiserfs_check_path(&path_to_key);
1898 goto out_bad_inode;
1899 }
1900#ifdef DISPLACE_NEW_PACKING_LOCALITIES
1901 if (!th->displace_new_blocks)
1902 REISERFS_I(dir)->new_packing_locality = 0;
1903#endif
1904 if (S_ISDIR(mode)) {
1905 /* insert item with "." and ".." */
1906 retval =
1907 reiserfs_new_directory(th, inode, &ih, &path_to_key, dir);
1908 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001909
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001910 if (S_ISLNK(mode)) {
1911 /* insert body of symlink */
1912 if (!old_format_only(sb))
1913 i_size = ROUND_UP(i_size);
1914 retval =
1915 reiserfs_new_symlink(th, inode, &ih, &path_to_key, symname,
1916 i_size);
1917 }
1918 if (retval) {
1919 err = retval;
1920 reiserfs_check_path(&path_to_key);
1921 journal_end(th, th->t_super, th->t_blocks_allocated);
1922 goto out_inserted_sd;
1923 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001924
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001925 /* XXX CHECK THIS */
1926 if (reiserfs_posixacl(inode->i_sb)) {
1927 retval = reiserfs_inherit_default_acl(dir, dentry, inode);
1928 if (retval) {
1929 err = retval;
1930 reiserfs_check_path(&path_to_key);
1931 journal_end(th, th->t_super, th->t_blocks_allocated);
1932 goto out_inserted_sd;
1933 }
1934 } else if (inode->i_sb->s_flags & MS_POSIXACL) {
1935 reiserfs_warning(inode->i_sb, "ACLs aren't enabled in the fs, "
1936 "but vfs thinks they are!");
1937 } else if (is_reiserfs_priv_object(dir)) {
1938 reiserfs_mark_inode_private(inode);
1939 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001940
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001941 insert_inode_hash(inode);
1942 reiserfs_update_sd(th, inode);
1943 reiserfs_check_path(&path_to_key);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001944
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001945 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001946
1947/* it looks like you can easily compress these two goto targets into
1948 * one. Keeping it like this doesn't actually hurt anything, and they
1949 * are place holders for what the quota code actually needs.
1950 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001951 out_bad_inode:
1952 /* Invalidate the object, nothing was inserted yet */
1953 INODE_PKEY(inode)->k_objectid = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001954
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001955 /* Quota change must be inside a transaction for journaling */
1956 DQUOT_FREE_INODE(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001957
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001958 out_end_trans:
1959 journal_end(th, th->t_super, th->t_blocks_allocated);
1960 /* Drop can be outside and it needs more credits so it's better to have it outside */
1961 DQUOT_DROP(inode);
1962 inode->i_flags |= S_NOQUOTA;
1963 make_bad_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001964
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001965 out_inserted_sd:
1966 inode->i_nlink = 0;
1967 th->t_trans_id = 0; /* so the caller can't use this handle later */
Jeff Mahoneyb3bb8af2005-07-27 11:43:38 -07001968
1969 /* If we were inheriting an ACL, we need to release the lock so that
1970 * iput doesn't deadlock in reiserfs_delete_xattrs. The locking
1971 * code really needs to be reworked, but this will take care of it
1972 * for now. -jeffm */
Alexey Dobriyancfe14672006-09-29 02:00:00 -07001973#ifdef CONFIG_REISERFS_FS_POSIX_ACL
Jan Karad86c3902005-08-18 11:24:17 -07001974 if (REISERFS_I(dir)->i_acl_default && !IS_ERR(REISERFS_I(dir)->i_acl_default)) {
Jeff Mahoneyb3bb8af2005-07-27 11:43:38 -07001975 reiserfs_write_unlock_xattrs(dir->i_sb);
1976 iput(inode);
1977 reiserfs_write_lock_xattrs(dir->i_sb);
1978 } else
Alexey Dobriyancfe14672006-09-29 02:00:00 -07001979#endif
Jeff Mahoneyb3bb8af2005-07-27 11:43:38 -07001980 iput(inode);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001981 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001982}
1983
1984/*
1985** finds the tail page in the page cache,
1986** reads the last block in.
1987**
1988** On success, page_result is set to a locked, pinned page, and bh_result
1989** is set to an up to date buffer for the last block in the file. returns 0.
1990**
1991** tail conversion is not done, so bh_result might not be valid for writing
1992** check buffer_mapped(bh_result) and bh_result->b_blocknr != 0 before
1993** trying to write the block.
1994**
1995** on failure, nonzero is returned, page_result and bh_result are untouched.
1996*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001997static int grab_tail_page(struct inode *p_s_inode,
1998 struct page **page_result,
1999 struct buffer_head **bh_result)
2000{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002001
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002002 /* we want the page with the last byte in the file,
2003 ** not the page that will hold the next byte for appending
2004 */
2005 unsigned long index = (p_s_inode->i_size - 1) >> PAGE_CACHE_SHIFT;
2006 unsigned long pos = 0;
2007 unsigned long start = 0;
2008 unsigned long blocksize = p_s_inode->i_sb->s_blocksize;
2009 unsigned long offset = (p_s_inode->i_size) & (PAGE_CACHE_SIZE - 1);
2010 struct buffer_head *bh;
2011 struct buffer_head *head;
2012 struct page *page;
2013 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002014
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002015 /* we know that we are only called with inode->i_size > 0.
2016 ** we also know that a file tail can never be as big as a block
2017 ** If i_size % blocksize == 0, our file is currently block aligned
2018 ** and it won't need converting or zeroing after a truncate.
2019 */
2020 if ((offset & (blocksize - 1)) == 0) {
2021 return -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002022 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002023 page = grab_cache_page(p_s_inode->i_mapping, index);
2024 error = -ENOMEM;
2025 if (!page) {
2026 goto out;
2027 }
2028 /* start within the page of the last block in the file */
2029 start = (offset / blocksize) * blocksize;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002030
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002031 error = block_prepare_write(page, start, offset,
2032 reiserfs_get_block_create_0);
2033 if (error)
2034 goto unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002035
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002036 head = page_buffers(page);
2037 bh = head;
2038 do {
2039 if (pos >= start) {
2040 break;
2041 }
2042 bh = bh->b_this_page;
2043 pos += blocksize;
2044 } while (bh != head);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002045
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002046 if (!buffer_uptodate(bh)) {
2047 /* note, this should never happen, prepare_write should
2048 ** be taking care of this for us. If the buffer isn't up to date,
2049 ** I've screwed up the code to find the buffer, or the code to
2050 ** call prepare_write
2051 */
2052 reiserfs_warning(p_s_inode->i_sb,
2053 "clm-6000: error reading block %lu on dev %s",
2054 bh->b_blocknr,
2055 reiserfs_bdevname(p_s_inode->i_sb));
2056 error = -EIO;
2057 goto unlock;
2058 }
2059 *bh_result = bh;
2060 *page_result = page;
2061
2062 out:
2063 return error;
2064
2065 unlock:
2066 unlock_page(page);
2067 page_cache_release(page);
2068 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002069}
2070
2071/*
2072** vfs version of truncate file. Must NOT be called with
2073** a transaction already started.
2074**
2075** some code taken from block_truncate_page
2076*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002077int reiserfs_truncate_file(struct inode *p_s_inode, int update_timestamps)
2078{
2079 struct reiserfs_transaction_handle th;
2080 /* we want the offset for the first byte after the end of the file */
2081 unsigned long offset = p_s_inode->i_size & (PAGE_CACHE_SIZE - 1);
2082 unsigned blocksize = p_s_inode->i_sb->s_blocksize;
2083 unsigned length;
2084 struct page *page = NULL;
2085 int error;
2086 struct buffer_head *bh = NULL;
Jeff Mahoney24996042005-12-14 14:38:05 -05002087 int err2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002088
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002089 reiserfs_write_lock(p_s_inode->i_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002090
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002091 if (p_s_inode->i_size > 0) {
2092 if ((error = grab_tail_page(p_s_inode, &page, &bh))) {
2093 // -ENOENT means we truncated past the end of the file,
2094 // and get_block_create_0 could not find a block to read in,
2095 // which is ok.
2096 if (error != -ENOENT)
2097 reiserfs_warning(p_s_inode->i_sb,
2098 "clm-6001: grab_tail_page failed %d",
2099 error);
2100 page = NULL;
2101 bh = NULL;
2102 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002103 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002104
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002105 /* so, if page != NULL, we have a buffer head for the offset at
2106 ** the end of the file. if the bh is mapped, and bh->b_blocknr != 0,
2107 ** then we have an unformatted node. Otherwise, we have a direct item,
2108 ** and no zeroing is required on disk. We zero after the truncate,
2109 ** because the truncate might pack the item anyway
2110 ** (it will unmap bh if it packs).
2111 */
2112 /* it is enough to reserve space in transaction for 2 balancings:
2113 one for "save" link adding and another for the first
2114 cut_from_item. 1 is for update_sd */
2115 error = journal_begin(&th, p_s_inode->i_sb,
2116 JOURNAL_PER_BALANCE_CNT * 2 + 1);
2117 if (error)
2118 goto out;
2119 reiserfs_update_inode_transaction(p_s_inode);
2120 if (update_timestamps)
2121 /* we are doing real truncate: if the system crashes before the last
2122 transaction of truncating gets committed - on reboot the file
2123 either appears truncated properly or not truncated at all */
2124 add_save_link(&th, p_s_inode, 1);
Jeff Mahoney24996042005-12-14 14:38:05 -05002125 err2 = reiserfs_do_truncate(&th, p_s_inode, page, update_timestamps);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002126 error =
2127 journal_end(&th, p_s_inode->i_sb, JOURNAL_PER_BALANCE_CNT * 2 + 1);
2128 if (error)
2129 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002130
Jeff Mahoney24996042005-12-14 14:38:05 -05002131 /* check reiserfs_do_truncate after ending the transaction */
2132 if (err2) {
2133 error = err2;
2134 goto out;
2135 }
2136
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002137 if (update_timestamps) {
2138 error = remove_save_link(p_s_inode, 1 /* truncate */ );
2139 if (error)
2140 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002141 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002142
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002143 if (page) {
2144 length = offset & (blocksize - 1);
2145 /* if we are not on a block boundary */
2146 if (length) {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002147 length = blocksize - length;
Christoph Lametereebd2aa2008-02-04 22:28:29 -08002148 zero_user(page, offset, length);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002149 if (buffer_mapped(bh) && bh->b_blocknr != 0) {
2150 mark_buffer_dirty(bh);
2151 }
2152 }
2153 unlock_page(page);
2154 page_cache_release(page);
2155 }
2156
2157 reiserfs_write_unlock(p_s_inode->i_sb);
2158 return 0;
2159 out:
2160 if (page) {
2161 unlock_page(page);
2162 page_cache_release(page);
2163 }
2164 reiserfs_write_unlock(p_s_inode->i_sb);
2165 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002166}
2167
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002168static int map_block_for_writepage(struct inode *inode,
2169 struct buffer_head *bh_result,
2170 unsigned long block)
2171{
2172 struct reiserfs_transaction_handle th;
2173 int fs_gen;
2174 struct item_head tmp_ih;
2175 struct item_head *ih;
2176 struct buffer_head *bh;
2177 __le32 *item;
2178 struct cpu_key key;
2179 INITIALIZE_PATH(path);
2180 int pos_in_item;
2181 int jbegin_count = JOURNAL_PER_BALANCE_CNT;
Oleg Drokin7729ac52005-11-28 13:43:53 -08002182 loff_t byte_offset = ((loff_t)block << inode->i_sb->s_blocksize_bits)+1;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002183 int retval;
2184 int use_get_block = 0;
2185 int bytes_copied = 0;
2186 int copy_size;
2187 int trans_running = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002188
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002189 /* catch places below that try to log something without starting a trans */
2190 th.t_trans_id = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002191
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002192 if (!buffer_uptodate(bh_result)) {
2193 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002194 }
2195
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002196 kmap(bh_result->b_page);
2197 start_over:
2198 reiserfs_write_lock(inode->i_sb);
2199 make_cpu_key(&key, inode, byte_offset, TYPE_ANY, 3);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002200
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002201 research:
2202 retval = search_for_position_by_key(inode->i_sb, &key, &path);
2203 if (retval != POSITION_FOUND) {
2204 use_get_block = 1;
2205 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002206 }
2207
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002208 bh = get_last_bh(&path);
2209 ih = get_ih(&path);
2210 item = get_item(&path);
2211 pos_in_item = path.pos_in_item;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002212
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002213 /* we've found an unformatted node */
2214 if (indirect_item_found(retval, ih)) {
2215 if (bytes_copied > 0) {
2216 reiserfs_warning(inode->i_sb,
2217 "clm-6002: bytes_copied %d",
2218 bytes_copied);
2219 }
2220 if (!get_block_num(item, pos_in_item)) {
2221 /* crap, we are writing to a hole */
2222 use_get_block = 1;
2223 goto out;
2224 }
2225 set_block_dev_mapped(bh_result,
2226 get_block_num(item, pos_in_item), inode);
2227 } else if (is_direct_le_ih(ih)) {
2228 char *p;
2229 p = page_address(bh_result->b_page);
2230 p += (byte_offset - 1) & (PAGE_CACHE_SIZE - 1);
2231 copy_size = ih_item_len(ih) - pos_in_item;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002232
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002233 fs_gen = get_generation(inode->i_sb);
2234 copy_item_head(&tmp_ih, ih);
2235
2236 if (!trans_running) {
2237 /* vs-3050 is gone, no need to drop the path */
2238 retval = journal_begin(&th, inode->i_sb, jbegin_count);
2239 if (retval)
2240 goto out;
2241 reiserfs_update_inode_transaction(inode);
2242 trans_running = 1;
2243 if (fs_changed(fs_gen, inode->i_sb)
2244 && item_moved(&tmp_ih, &path)) {
2245 reiserfs_restore_prepared_buffer(inode->i_sb,
2246 bh);
2247 goto research;
2248 }
2249 }
2250
2251 reiserfs_prepare_for_journal(inode->i_sb, bh, 1);
2252
2253 if (fs_changed(fs_gen, inode->i_sb)
2254 && item_moved(&tmp_ih, &path)) {
2255 reiserfs_restore_prepared_buffer(inode->i_sb, bh);
2256 goto research;
2257 }
2258
2259 memcpy(B_I_PITEM(bh, ih) + pos_in_item, p + bytes_copied,
2260 copy_size);
2261
2262 journal_mark_dirty(&th, inode->i_sb, bh);
2263 bytes_copied += copy_size;
2264 set_block_dev_mapped(bh_result, 0, inode);
2265
2266 /* are there still bytes left? */
2267 if (bytes_copied < bh_result->b_size &&
2268 (byte_offset + bytes_copied) < inode->i_size) {
2269 set_cpu_key_k_offset(&key,
2270 cpu_key_k_offset(&key) +
2271 copy_size);
2272 goto research;
2273 }
2274 } else {
2275 reiserfs_warning(inode->i_sb,
2276 "clm-6003: bad item inode %lu, device %s",
2277 inode->i_ino, reiserfs_bdevname(inode->i_sb));
2278 retval = -EIO;
2279 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002280 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002281 retval = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002282
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002283 out:
2284 pathrelse(&path);
2285 if (trans_running) {
2286 int err = journal_end(&th, inode->i_sb, jbegin_count);
2287 if (err)
2288 retval = err;
2289 trans_running = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002290 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002291 reiserfs_write_unlock(inode->i_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002292
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002293 /* this is where we fill in holes in the file. */
2294 if (use_get_block) {
2295 retval = reiserfs_get_block(inode, block, bh_result,
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08002296 GET_BLOCK_CREATE | GET_BLOCK_NO_IMUX
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002297 | GET_BLOCK_NO_DANGLE);
2298 if (!retval) {
2299 if (!buffer_mapped(bh_result)
2300 || bh_result->b_blocknr == 0) {
2301 /* get_block failed to find a mapped unformatted node. */
2302 use_get_block = 0;
2303 goto start_over;
2304 }
2305 }
2306 }
2307 kunmap(bh_result->b_page);
2308
2309 if (!retval && buffer_mapped(bh_result) && bh_result->b_blocknr == 0) {
2310 /* we've copied data from the page into the direct item, so the
2311 * buffer in the page is now clean, mark it to reflect that.
2312 */
2313 lock_buffer(bh_result);
2314 clear_buffer_dirty(bh_result);
2315 unlock_buffer(bh_result);
2316 }
2317 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002318}
2319
2320/*
2321 * mason@suse.com: updated in 2.5.54 to follow the same general io
2322 * start/recovery path as __block_write_full_page, along with special
2323 * code to handle reiserfs tails.
2324 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002325static int reiserfs_write_full_page(struct page *page,
2326 struct writeback_control *wbc)
2327{
2328 struct inode *inode = page->mapping->host;
2329 unsigned long end_index = inode->i_size >> PAGE_CACHE_SHIFT;
2330 int error = 0;
2331 unsigned long block;
Chris Masonb4c76fa2006-08-05 12:15:10 -07002332 sector_t last_block;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002333 struct buffer_head *head, *bh;
2334 int partial = 0;
2335 int nr = 0;
2336 int checked = PageChecked(page);
2337 struct reiserfs_transaction_handle th;
2338 struct super_block *s = inode->i_sb;
2339 int bh_per_page = PAGE_CACHE_SIZE / s->s_blocksize;
2340 th.t_trans_id = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002341
Chris Masone0e851c2006-02-01 03:06:49 -08002342 /* no logging allowed when nonblocking or from PF_MEMALLOC */
2343 if (checked && (current->flags & PF_MEMALLOC)) {
2344 redirty_page_for_writepage(wbc, page);
2345 unlock_page(page);
2346 return 0;
2347 }
2348
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002349 /* The page dirty bit is cleared before writepage is called, which
2350 * means we have to tell create_empty_buffers to make dirty buffers
2351 * The page really should be up to date at this point, so tossing
2352 * in the BH_Uptodate is just a sanity check.
2353 */
2354 if (!page_has_buffers(page)) {
2355 create_empty_buffers(page, s->s_blocksize,
2356 (1 << BH_Dirty) | (1 << BH_Uptodate));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002357 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002358 head = page_buffers(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002359
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002360 /* last page in the file, zero out any contents past the
2361 ** last byte in the file
2362 */
2363 if (page->index >= end_index) {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002364 unsigned last_offset;
2365
2366 last_offset = inode->i_size & (PAGE_CACHE_SIZE - 1);
2367 /* no file contents in this page */
2368 if (page->index >= end_index + 1 || !last_offset) {
2369 unlock_page(page);
2370 return 0;
2371 }
Christoph Lametereebd2aa2008-02-04 22:28:29 -08002372 zero_user_segment(page, last_offset, PAGE_CACHE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002373 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002374 bh = head;
2375 block = page->index << (PAGE_CACHE_SHIFT - s->s_blocksize_bits);
Chris Masonb4c76fa2006-08-05 12:15:10 -07002376 last_block = (i_size_read(inode) - 1) >> inode->i_blkbits;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002377 /* first map all the buffers, logging any direct items we find */
2378 do {
Chris Masonb4c76fa2006-08-05 12:15:10 -07002379 if (block > last_block) {
2380 /*
2381 * This can happen when the block size is less than
2382 * the page size. The corresponding bytes in the page
2383 * were zero filled above
2384 */
2385 clear_buffer_dirty(bh);
2386 set_buffer_uptodate(bh);
2387 } else if ((checked || buffer_dirty(bh)) &&
2388 (!buffer_mapped(bh) || (buffer_mapped(bh)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002389 && bh->b_blocknr ==
2390 0))) {
2391 /* not mapped yet, or it points to a direct item, search
2392 * the btree for the mapping info, and log any direct
2393 * items found
2394 */
2395 if ((error = map_block_for_writepage(inode, bh, block))) {
2396 goto fail;
2397 }
2398 }
2399 bh = bh->b_this_page;
2400 block++;
2401 } while (bh != head);
2402
2403 /*
2404 * we start the transaction after map_block_for_writepage,
2405 * because it can create holes in the file (an unbounded operation).
2406 * starting it here, we can make a reliable estimate for how many
2407 * blocks we're going to log
2408 */
2409 if (checked) {
2410 ClearPageChecked(page);
2411 reiserfs_write_lock(s);
2412 error = journal_begin(&th, s, bh_per_page + 1);
2413 if (error) {
2414 reiserfs_write_unlock(s);
2415 goto fail;
2416 }
2417 reiserfs_update_inode_transaction(inode);
2418 }
2419 /* now go through and lock any dirty buffers on the page */
2420 do {
2421 get_bh(bh);
2422 if (!buffer_mapped(bh))
2423 continue;
2424 if (buffer_mapped(bh) && bh->b_blocknr == 0)
2425 continue;
2426
2427 if (checked) {
2428 reiserfs_prepare_for_journal(s, bh, 1);
2429 journal_mark_dirty(&th, s, bh);
2430 continue;
2431 }
2432 /* from this point on, we know the buffer is mapped to a
2433 * real block and not a direct item
2434 */
2435 if (wbc->sync_mode != WB_SYNC_NONE || !wbc->nonblocking) {
2436 lock_buffer(bh);
2437 } else {
2438 if (test_set_buffer_locked(bh)) {
2439 redirty_page_for_writepage(wbc, page);
2440 continue;
2441 }
2442 }
2443 if (test_clear_buffer_dirty(bh)) {
2444 mark_buffer_async_write(bh);
2445 } else {
2446 unlock_buffer(bh);
2447 }
2448 } while ((bh = bh->b_this_page) != head);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002449
2450 if (checked) {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002451 error = journal_end(&th, s, bh_per_page + 1);
2452 reiserfs_write_unlock(s);
2453 if (error)
2454 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002455 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002456 BUG_ON(PageWriteback(page));
2457 set_page_writeback(page);
2458 unlock_page(page);
2459
2460 /*
2461 * since any buffer might be the only dirty buffer on the page,
2462 * the first submit_bh can bring the page out of writeback.
2463 * be careful with the buffers.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002464 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002465 do {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002466 struct buffer_head *next = bh->b_this_page;
2467 if (buffer_async_write(bh)) {
2468 submit_bh(WRITE, bh);
2469 nr++;
2470 }
2471 put_bh(bh);
2472 bh = next;
2473 } while (bh != head);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002474
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002475 error = 0;
2476 done:
2477 if (nr == 0) {
2478 /*
2479 * if this page only had a direct item, it is very possible for
2480 * no io to be required without there being an error. Or,
2481 * someone else could have locked them and sent them down the
2482 * pipe without locking the page
2483 */
2484 bh = head;
2485 do {
2486 if (!buffer_uptodate(bh)) {
2487 partial = 1;
2488 break;
2489 }
2490 bh = bh->b_this_page;
2491 } while (bh != head);
2492 if (!partial)
2493 SetPageUptodate(page);
2494 end_page_writeback(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002495 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002496 return error;
2497
2498 fail:
2499 /* catches various errors, we need to make sure any valid dirty blocks
2500 * get to the media. The page is currently locked and not marked for
2501 * writeback
2502 */
2503 ClearPageUptodate(page);
2504 bh = head;
2505 do {
2506 get_bh(bh);
2507 if (buffer_mapped(bh) && buffer_dirty(bh) && bh->b_blocknr) {
2508 lock_buffer(bh);
2509 mark_buffer_async_write(bh);
2510 } else {
2511 /*
2512 * clear any dirty bits that might have come from getting
2513 * attached to a dirty page
2514 */
2515 clear_buffer_dirty(bh);
2516 }
2517 bh = bh->b_this_page;
2518 } while (bh != head);
2519 SetPageError(page);
2520 BUG_ON(PageWriteback(page));
2521 set_page_writeback(page);
2522 unlock_page(page);
2523 do {
2524 struct buffer_head *next = bh->b_this_page;
2525 if (buffer_async_write(bh)) {
2526 clear_buffer_dirty(bh);
2527 submit_bh(WRITE, bh);
2528 nr++;
2529 }
2530 put_bh(bh);
2531 bh = next;
2532 } while (bh != head);
2533 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002534}
2535
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002536static int reiserfs_readpage(struct file *f, struct page *page)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002537{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002538 return block_read_full_page(page, reiserfs_get_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002539}
2540
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002541static int reiserfs_writepage(struct page *page, struct writeback_control *wbc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002542{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002543 struct inode *inode = page->mapping->host;
2544 reiserfs_wait_on_write_block(inode->i_sb);
2545 return reiserfs_write_full_page(page, wbc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002546}
2547
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -07002548static int reiserfs_write_begin(struct file *file,
2549 struct address_space *mapping,
2550 loff_t pos, unsigned len, unsigned flags,
2551 struct page **pagep, void **fsdata)
2552{
2553 struct inode *inode;
2554 struct page *page;
2555 pgoff_t index;
2556 int ret;
2557 int old_ref = 0;
2558
Vladimir Savelievf7557e82007-10-16 01:25:14 -07002559 inode = mapping->host;
2560 *fsdata = 0;
2561 if (flags & AOP_FLAG_CONT_EXPAND &&
2562 (pos & (inode->i_sb->s_blocksize - 1)) == 0) {
2563 pos ++;
2564 *fsdata = (void *)(unsigned long)flags;
2565 }
2566
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -07002567 index = pos >> PAGE_CACHE_SHIFT;
2568 page = __grab_cache_page(mapping, index);
2569 if (!page)
2570 return -ENOMEM;
2571 *pagep = page;
2572
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -07002573 reiserfs_wait_on_write_block(inode->i_sb);
2574 fix_tail_page_for_writing(page);
2575 if (reiserfs_transaction_running(inode->i_sb)) {
2576 struct reiserfs_transaction_handle *th;
2577 th = (struct reiserfs_transaction_handle *)current->
2578 journal_info;
2579 BUG_ON(!th->t_refcount);
2580 BUG_ON(!th->t_trans_id);
2581 old_ref = th->t_refcount;
2582 th->t_refcount++;
2583 }
2584 ret = block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
2585 reiserfs_get_block);
2586 if (ret && reiserfs_transaction_running(inode->i_sb)) {
2587 struct reiserfs_transaction_handle *th = current->journal_info;
2588 /* this gets a little ugly. If reiserfs_get_block returned an
2589 * error and left a transacstion running, we've got to close it,
2590 * and we've got to free handle if it was a persistent transaction.
2591 *
2592 * But, if we had nested into an existing transaction, we need
2593 * to just drop the ref count on the handle.
2594 *
2595 * If old_ref == 0, the transaction is from reiserfs_get_block,
2596 * and it was a persistent trans. Otherwise, it was nested above.
2597 */
2598 if (th->t_refcount > old_ref) {
2599 if (old_ref)
2600 th->t_refcount--;
2601 else {
2602 int err;
2603 reiserfs_write_lock(inode->i_sb);
2604 err = reiserfs_end_persistent_transaction(th);
2605 reiserfs_write_unlock(inode->i_sb);
2606 if (err)
2607 ret = err;
2608 }
2609 }
2610 }
2611 if (ret) {
2612 unlock_page(page);
2613 page_cache_release(page);
2614 }
2615 return ret;
2616}
2617
2618int reiserfs_prepare_write(struct file *f, struct page *page,
2619 unsigned from, unsigned to)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002620{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002621 struct inode *inode = page->mapping->host;
2622 int ret;
2623 int old_ref = 0;
2624
2625 reiserfs_wait_on_write_block(inode->i_sb);
2626 fix_tail_page_for_writing(page);
2627 if (reiserfs_transaction_running(inode->i_sb)) {
2628 struct reiserfs_transaction_handle *th;
2629 th = (struct reiserfs_transaction_handle *)current->
2630 journal_info;
2631 BUG_ON(!th->t_refcount);
2632 BUG_ON(!th->t_trans_id);
2633 old_ref = th->t_refcount;
2634 th->t_refcount++;
2635 }
2636
2637 ret = block_prepare_write(page, from, to, reiserfs_get_block);
2638 if (ret && reiserfs_transaction_running(inode->i_sb)) {
2639 struct reiserfs_transaction_handle *th = current->journal_info;
2640 /* this gets a little ugly. If reiserfs_get_block returned an
2641 * error and left a transacstion running, we've got to close it,
2642 * and we've got to free handle if it was a persistent transaction.
2643 *
2644 * But, if we had nested into an existing transaction, we need
2645 * to just drop the ref count on the handle.
2646 *
2647 * If old_ref == 0, the transaction is from reiserfs_get_block,
2648 * and it was a persistent trans. Otherwise, it was nested above.
2649 */
2650 if (th->t_refcount > old_ref) {
2651 if (old_ref)
2652 th->t_refcount--;
2653 else {
2654 int err;
2655 reiserfs_write_lock(inode->i_sb);
2656 err = reiserfs_end_persistent_transaction(th);
2657 reiserfs_write_unlock(inode->i_sb);
2658 if (err)
2659 ret = err;
2660 }
2661 }
2662 }
2663 return ret;
2664
2665}
2666
2667static sector_t reiserfs_aop_bmap(struct address_space *as, sector_t block)
2668{
2669 return generic_block_bmap(as, block, reiserfs_bmap);
2670}
2671
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -07002672static int reiserfs_write_end(struct file *file, struct address_space *mapping,
2673 loff_t pos, unsigned len, unsigned copied,
2674 struct page *page, void *fsdata)
2675{
2676 struct inode *inode = page->mapping->host;
2677 int ret = 0;
2678 int update_sd = 0;
2679 struct reiserfs_transaction_handle *th;
2680 unsigned start;
2681
Vladimir Savelievf7557e82007-10-16 01:25:14 -07002682 if ((unsigned long)fsdata & AOP_FLAG_CONT_EXPAND)
2683 pos ++;
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -07002684
2685 reiserfs_wait_on_write_block(inode->i_sb);
2686 if (reiserfs_transaction_running(inode->i_sb))
2687 th = current->journal_info;
2688 else
2689 th = NULL;
2690
2691 start = pos & (PAGE_CACHE_SIZE - 1);
2692 if (unlikely(copied < len)) {
2693 if (!PageUptodate(page))
2694 copied = 0;
2695
2696 page_zero_new_buffers(page, start + copied, start + len);
2697 }
2698 flush_dcache_page(page);
2699
2700 reiserfs_commit_page(inode, page, start, start + copied);
2701
2702 /* generic_commit_write does this for us, but does not update the
2703 ** transaction tracking stuff when the size changes. So, we have
2704 ** to do the i_size updates here.
2705 */
2706 pos += copied;
2707 if (pos > inode->i_size) {
2708 struct reiserfs_transaction_handle myth;
2709 reiserfs_write_lock(inode->i_sb);
2710 /* If the file have grown beyond the border where it
2711 can have a tail, unmark it as needing a tail
2712 packing */
2713 if ((have_large_tails(inode->i_sb)
2714 && inode->i_size > i_block_size(inode) * 4)
2715 || (have_small_tails(inode->i_sb)
2716 && inode->i_size > i_block_size(inode)))
2717 REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask;
2718
2719 ret = journal_begin(&myth, inode->i_sb, 1);
2720 if (ret) {
2721 reiserfs_write_unlock(inode->i_sb);
2722 goto journal_error;
2723 }
2724 reiserfs_update_inode_transaction(inode);
2725 inode->i_size = pos;
2726 /*
2727 * this will just nest into our transaction. It's important
2728 * to use mark_inode_dirty so the inode gets pushed around on the
2729 * dirty lists, and so that O_SYNC works as expected
2730 */
2731 mark_inode_dirty(inode);
2732 reiserfs_update_sd(&myth, inode);
2733 update_sd = 1;
2734 ret = journal_end(&myth, inode->i_sb, 1);
2735 reiserfs_write_unlock(inode->i_sb);
2736 if (ret)
2737 goto journal_error;
2738 }
2739 if (th) {
2740 reiserfs_write_lock(inode->i_sb);
2741 if (!update_sd)
2742 mark_inode_dirty(inode);
2743 ret = reiserfs_end_persistent_transaction(th);
2744 reiserfs_write_unlock(inode->i_sb);
2745 if (ret)
2746 goto out;
2747 }
2748
2749 out:
2750 unlock_page(page);
2751 page_cache_release(page);
2752 return ret == 0 ? copied : ret;
2753
2754 journal_error:
2755 if (th) {
2756 reiserfs_write_lock(inode->i_sb);
2757 if (!update_sd)
2758 reiserfs_update_sd(th, inode);
2759 ret = reiserfs_end_persistent_transaction(th);
2760 reiserfs_write_unlock(inode->i_sb);
2761 }
2762
2763 goto out;
2764}
2765
2766int reiserfs_commit_write(struct file *f, struct page *page,
2767 unsigned from, unsigned to)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002768{
2769 struct inode *inode = page->mapping->host;
2770 loff_t pos = ((loff_t) page->index << PAGE_CACHE_SHIFT) + to;
2771 int ret = 0;
2772 int update_sd = 0;
2773 struct reiserfs_transaction_handle *th = NULL;
2774
2775 reiserfs_wait_on_write_block(inode->i_sb);
2776 if (reiserfs_transaction_running(inode->i_sb)) {
2777 th = current->journal_info;
2778 }
2779 reiserfs_commit_page(inode, page, from, to);
2780
2781 /* generic_commit_write does this for us, but does not update the
2782 ** transaction tracking stuff when the size changes. So, we have
2783 ** to do the i_size updates here.
2784 */
2785 if (pos > inode->i_size) {
2786 struct reiserfs_transaction_handle myth;
2787 reiserfs_write_lock(inode->i_sb);
2788 /* If the file have grown beyond the border where it
2789 can have a tail, unmark it as needing a tail
2790 packing */
2791 if ((have_large_tails(inode->i_sb)
2792 && inode->i_size > i_block_size(inode) * 4)
2793 || (have_small_tails(inode->i_sb)
2794 && inode->i_size > i_block_size(inode)))
2795 REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask;
2796
2797 ret = journal_begin(&myth, inode->i_sb, 1);
2798 if (ret) {
2799 reiserfs_write_unlock(inode->i_sb);
2800 goto journal_error;
2801 }
2802 reiserfs_update_inode_transaction(inode);
2803 inode->i_size = pos;
Chris Mason9f037832005-09-13 01:25:17 -07002804 /*
2805 * this will just nest into our transaction. It's important
2806 * to use mark_inode_dirty so the inode gets pushed around on the
2807 * dirty lists, and so that O_SYNC works as expected
2808 */
2809 mark_inode_dirty(inode);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002810 reiserfs_update_sd(&myth, inode);
2811 update_sd = 1;
2812 ret = journal_end(&myth, inode->i_sb, 1);
2813 reiserfs_write_unlock(inode->i_sb);
2814 if (ret)
2815 goto journal_error;
2816 }
2817 if (th) {
2818 reiserfs_write_lock(inode->i_sb);
2819 if (!update_sd)
Chris Mason9f037832005-09-13 01:25:17 -07002820 mark_inode_dirty(inode);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002821 ret = reiserfs_end_persistent_transaction(th);
2822 reiserfs_write_unlock(inode->i_sb);
2823 if (ret)
2824 goto out;
2825 }
2826
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002827 out:
2828 return ret;
2829
2830 journal_error:
2831 if (th) {
2832 reiserfs_write_lock(inode->i_sb);
2833 if (!update_sd)
2834 reiserfs_update_sd(th, inode);
2835 ret = reiserfs_end_persistent_transaction(th);
2836 reiserfs_write_unlock(inode->i_sb);
2837 }
2838
2839 return ret;
2840}
2841
2842void sd_attrs_to_i_attrs(__u16 sd_attrs, struct inode *inode)
2843{
2844 if (reiserfs_attrs(inode->i_sb)) {
2845 if (sd_attrs & REISERFS_SYNC_FL)
2846 inode->i_flags |= S_SYNC;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002847 else
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002848 inode->i_flags &= ~S_SYNC;
2849 if (sd_attrs & REISERFS_IMMUTABLE_FL)
2850 inode->i_flags |= S_IMMUTABLE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002851 else
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002852 inode->i_flags &= ~S_IMMUTABLE;
2853 if (sd_attrs & REISERFS_APPEND_FL)
2854 inode->i_flags |= S_APPEND;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002855 else
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002856 inode->i_flags &= ~S_APPEND;
2857 if (sd_attrs & REISERFS_NOATIME_FL)
2858 inode->i_flags |= S_NOATIME;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002859 else
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002860 inode->i_flags &= ~S_NOATIME;
2861 if (sd_attrs & REISERFS_NOTAIL_FL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002862 REISERFS_I(inode)->i_flags |= i_nopack_mask;
2863 else
2864 REISERFS_I(inode)->i_flags &= ~i_nopack_mask;
2865 }
2866}
2867
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002868void i_attrs_to_sd_attrs(struct inode *inode, __u16 * sd_attrs)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002869{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002870 if (reiserfs_attrs(inode->i_sb)) {
2871 if (inode->i_flags & S_IMMUTABLE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002872 *sd_attrs |= REISERFS_IMMUTABLE_FL;
2873 else
2874 *sd_attrs &= ~REISERFS_IMMUTABLE_FL;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002875 if (inode->i_flags & S_SYNC)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002876 *sd_attrs |= REISERFS_SYNC_FL;
2877 else
2878 *sd_attrs &= ~REISERFS_SYNC_FL;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002879 if (inode->i_flags & S_NOATIME)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002880 *sd_attrs |= REISERFS_NOATIME_FL;
2881 else
2882 *sd_attrs &= ~REISERFS_NOATIME_FL;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002883 if (REISERFS_I(inode)->i_flags & i_nopack_mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002884 *sd_attrs |= REISERFS_NOTAIL_FL;
2885 else
2886 *sd_attrs &= ~REISERFS_NOTAIL_FL;
2887 }
2888}
2889
2890/* decide if this buffer needs to stay around for data logging or ordered
2891** write purposes
2892*/
2893static int invalidatepage_can_drop(struct inode *inode, struct buffer_head *bh)
2894{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002895 int ret = 1;
2896 struct reiserfs_journal *j = SB_JOURNAL(inode->i_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002897
Chris Masond62b1b82006-02-01 03:06:47 -08002898 lock_buffer(bh);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002899 spin_lock(&j->j_dirty_buffers_lock);
2900 if (!buffer_mapped(bh)) {
2901 goto free_jh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002902 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002903 /* the page is locked, and the only places that log a data buffer
2904 * also lock the page.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002905 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002906 if (reiserfs_file_data_log(inode)) {
2907 /*
2908 * very conservative, leave the buffer pinned if
2909 * anyone might need it.
2910 */
2911 if (buffer_journaled(bh) || buffer_journal_dirty(bh)) {
2912 ret = 0;
2913 }
Chris Masond62b1b82006-02-01 03:06:47 -08002914 } else if (buffer_dirty(bh)) {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002915 struct reiserfs_journal_list *jl;
2916 struct reiserfs_jh *jh = bh->b_private;
2917
2918 /* why is this safe?
2919 * reiserfs_setattr updates i_size in the on disk
2920 * stat data before allowing vmtruncate to be called.
2921 *
2922 * If buffer was put onto the ordered list for this
2923 * transaction, we know for sure either this transaction
2924 * or an older one already has updated i_size on disk,
2925 * and this ordered data won't be referenced in the file
2926 * if we crash.
2927 *
2928 * if the buffer was put onto the ordered list for an older
2929 * transaction, we need to leave it around
2930 */
2931 if (jh && (jl = jh->jl)
2932 && jl != SB_JOURNAL(inode->i_sb)->j_current_jl)
2933 ret = 0;
2934 }
2935 free_jh:
2936 if (ret && bh->b_private) {
2937 reiserfs_free_jh(bh);
2938 }
2939 spin_unlock(&j->j_dirty_buffers_lock);
Chris Masond62b1b82006-02-01 03:06:47 -08002940 unlock_buffer(bh);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002941 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002942}
2943
2944/* clm -- taken from fs/buffer.c:block_invalidate_page */
NeilBrown2ff28e22006-03-26 01:37:18 -08002945static void reiserfs_invalidatepage(struct page *page, unsigned long offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002946{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002947 struct buffer_head *head, *bh, *next;
2948 struct inode *inode = page->mapping->host;
2949 unsigned int curr_off = 0;
2950 int ret = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002951
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002952 BUG_ON(!PageLocked(page));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002953
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002954 if (offset == 0)
2955 ClearPageChecked(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002956
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002957 if (!page_has_buffers(page))
2958 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002959
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002960 head = page_buffers(page);
2961 bh = head;
2962 do {
2963 unsigned int next_off = curr_off + bh->b_size;
2964 next = bh->b_this_page;
2965
2966 /*
2967 * is this block fully invalidated?
2968 */
2969 if (offset <= curr_off) {
2970 if (invalidatepage_can_drop(inode, bh))
2971 reiserfs_unmap_buffer(bh);
2972 else
2973 ret = 0;
2974 }
2975 curr_off = next_off;
2976 bh = next;
2977 } while (bh != head);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002978
2979 /*
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002980 * We release buffers only if the entire page is being invalidated.
2981 * The get_block cached value has been unconditionally invalidated,
2982 * so real IO is not possible anymore.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002983 */
NeilBrown2ff28e22006-03-26 01:37:18 -08002984 if (!offset && ret) {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002985 ret = try_to_release_page(page, 0);
NeilBrown2ff28e22006-03-26 01:37:18 -08002986 /* maybe should BUG_ON(!ret); - neilb */
2987 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002988 out:
NeilBrown2ff28e22006-03-26 01:37:18 -08002989 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002990}
2991
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002992static int reiserfs_set_page_dirty(struct page *page)
2993{
2994 struct inode *inode = page->mapping->host;
2995 if (reiserfs_file_data_log(inode)) {
2996 SetPageChecked(page);
2997 return __set_page_dirty_nobuffers(page);
2998 }
2999 return __set_page_dirty_buffers(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003000}
3001
3002/*
3003 * Returns 1 if the page's buffers were dropped. The page is locked.
3004 *
3005 * Takes j_dirty_buffers_lock to protect the b_assoc_buffers list_heads
3006 * in the buffers at page_buffers(page).
3007 *
3008 * even in -o notail mode, we can't be sure an old mount without -o notail
3009 * didn't create files with tails.
3010 */
Al Viro27496a82005-10-21 03:20:48 -04003011static int reiserfs_releasepage(struct page *page, gfp_t unused_gfp_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003012{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003013 struct inode *inode = page->mapping->host;
3014 struct reiserfs_journal *j = SB_JOURNAL(inode->i_sb);
3015 struct buffer_head *head;
3016 struct buffer_head *bh;
3017 int ret = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003018
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003019 WARN_ON(PageChecked(page));
3020 spin_lock(&j->j_dirty_buffers_lock);
3021 head = page_buffers(page);
3022 bh = head;
3023 do {
3024 if (bh->b_private) {
3025 if (!buffer_dirty(bh) && !buffer_locked(bh)) {
3026 reiserfs_free_jh(bh);
3027 } else {
3028 ret = 0;
3029 break;
3030 }
3031 }
3032 bh = bh->b_this_page;
3033 } while (bh != head);
3034 if (ret)
3035 ret = try_to_free_buffers(page);
3036 spin_unlock(&j->j_dirty_buffers_lock);
3037 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003038}
3039
3040/* We thank Mingming Cao for helping us understand in great detail what
3041 to do in this section of the code. */
3042static ssize_t reiserfs_direct_IO(int rw, struct kiocb *iocb,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003043 const struct iovec *iov, loff_t offset,
3044 unsigned long nr_segs)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003045{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003046 struct file *file = iocb->ki_filp;
3047 struct inode *inode = file->f_mapping->host;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003048
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003049 return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
3050 offset, nr_segs,
3051 reiserfs_get_blocks_direct_io, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003052}
3053
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003054int reiserfs_setattr(struct dentry *dentry, struct iattr *attr)
3055{
3056 struct inode *inode = dentry->d_inode;
3057 int error;
Jeff Laytoncdd6fe62007-10-18 03:05:19 -07003058 unsigned int ia_valid;
3059
3060 /* must be turned off for recursive notify_change calls */
3061 ia_valid = attr->ia_valid &= ~(ATTR_KILL_SUID|ATTR_KILL_SGID);
3062
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003063 reiserfs_write_lock(inode->i_sb);
3064 if (attr->ia_valid & ATTR_SIZE) {
3065 /* version 2 items will be caught by the s_maxbytes check
3066 ** done for us in vmtruncate
3067 */
3068 if (get_inode_item_key_version(inode) == KEY_FORMAT_3_5 &&
3069 attr->ia_size > MAX_NON_LFS) {
3070 error = -EFBIG;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003071 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003072 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003073 /* fill in hole pointers in the expanding truncate case. */
3074 if (attr->ia_size > inode->i_size) {
Vladimir Savelievf7557e82007-10-16 01:25:14 -07003075 error = generic_cont_expand_simple(inode, attr->ia_size);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003076 if (REISERFS_I(inode)->i_prealloc_count > 0) {
3077 int err;
3078 struct reiserfs_transaction_handle th;
3079 /* we're changing at most 2 bitmaps, inode + super */
3080 err = journal_begin(&th, inode->i_sb, 4);
3081 if (!err) {
3082 reiserfs_discard_prealloc(&th, inode);
3083 err = journal_end(&th, inode->i_sb, 4);
3084 }
3085 if (err)
3086 error = err;
3087 }
3088 if (error)
3089 goto out;
Vladimir Savelievdd535a52006-07-01 04:36:32 -07003090 /*
3091 * file size is changed, ctime and mtime are
3092 * to be updated
3093 */
3094 attr->ia_valid |= (ATTR_MTIME | ATTR_CTIME);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003095 }
3096 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003097
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003098 if ((((attr->ia_valid & ATTR_UID) && (attr->ia_uid & ~0xffff)) ||
3099 ((attr->ia_valid & ATTR_GID) && (attr->ia_gid & ~0xffff))) &&
3100 (get_inode_sd_version(inode) == STAT_DATA_V1)) {
3101 /* stat data of format v3.5 has 16 bit uid and gid */
3102 error = -EINVAL;
3103 goto out;
3104 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003105
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003106 error = inode_change_ok(inode, attr);
3107 if (!error) {
3108 if ((ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
3109 (ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid)) {
3110 error = reiserfs_chown_xattrs(inode, attr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003111
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003112 if (!error) {
3113 struct reiserfs_transaction_handle th;
3114 int jbegin_count =
3115 2 *
3116 (REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb) +
3117 REISERFS_QUOTA_DEL_BLOCKS(inode->i_sb)) +
3118 2;
3119
3120 /* (user+group)*(old+new) structure - we count quota info and , inode write (sb, inode) */
3121 error =
3122 journal_begin(&th, inode->i_sb,
3123 jbegin_count);
3124 if (error)
3125 goto out;
3126 error =
3127 DQUOT_TRANSFER(inode, attr) ? -EDQUOT : 0;
3128 if (error) {
3129 journal_end(&th, inode->i_sb,
3130 jbegin_count);
3131 goto out;
3132 }
3133 /* Update corresponding info in inode so that everything is in
3134 * one transaction */
3135 if (attr->ia_valid & ATTR_UID)
3136 inode->i_uid = attr->ia_uid;
3137 if (attr->ia_valid & ATTR_GID)
3138 inode->i_gid = attr->ia_gid;
3139 mark_inode_dirty(inode);
3140 error =
3141 journal_end(&th, inode->i_sb, jbegin_count);
3142 }
3143 }
3144 if (!error)
3145 error = inode_setattr(inode, attr);
3146 }
3147
3148 if (!error && reiserfs_posixacl(inode->i_sb)) {
3149 if (attr->ia_valid & ATTR_MODE)
3150 error = reiserfs_acl_chmod(inode);
3151 }
3152
3153 out:
3154 reiserfs_write_unlock(inode->i_sb);
3155 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003156}
3157
Christoph Hellwigf5e54d62006-06-28 04:26:44 -07003158const struct address_space_operations reiserfs_address_space_operations = {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003159 .writepage = reiserfs_writepage,
3160 .readpage = reiserfs_readpage,
3161 .readpages = reiserfs_readpages,
3162 .releasepage = reiserfs_releasepage,
3163 .invalidatepage = reiserfs_invalidatepage,
3164 .sync_page = block_sync_page,
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -07003165 .write_begin = reiserfs_write_begin,
3166 .write_end = reiserfs_write_end,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003167 .bmap = reiserfs_aop_bmap,
3168 .direct_IO = reiserfs_direct_IO,
3169 .set_page_dirty = reiserfs_set_page_dirty,
3170};