1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Lustre Lite I/O Page Cache
6 * Copyright (C) 2002 Cluster File Systems, Inc.
9 #include <linux/config.h>
10 #include <linux/kernel.h>
12 #include <linux/string.h>
13 #include <linux/stat.h>
14 #include <linux/iobuf.h>
15 #include <linux/errno.h>
16 #include <linux/locks.h>
17 #include <linux/unistd.h>
18 #include <linux/version.h>
19 #include <asm/system.h>
20 #include <asm/uaccess.h>
23 #include <linux/stat.h>
24 #include <asm/uaccess.h>
25 #include <asm/segment.h>
27 #include <linux/pagemap.h>
28 #include <linux/smp_lock.h>
30 #define DEBUG_SUBSYSTEM S_LLITE
32 #include <linux/lustre_mds.h>
33 #include <linux/lustre_lite.h>
35 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,4,10))
37 * Add a page to the dirty page list.
39 void __set_page_dirty(struct page *page)
41 struct address_space *mapping;
44 pg_lock = PAGECACHE_LOCK(page);
47 mapping = page->mapping;
48 spin_lock(&mapping->page_lock);
50 list_del(&page->list);
51 list_add(&page->list, &mapping->dirty_pages);
53 spin_unlock(&mapping->page_lock);
57 mark_inode_dirty_pages(mapping->host);
61 * Add a page to the dirty page list.
63 void set_page_dirty(struct page *page)
65 if (!test_and_set_bit(PG_dirty, &page->flags)) {
66 struct address_space *mapping = page->mapping;
69 spin_lock(&pagecache_lock);
70 list_del(&page->list);
71 list_add(&page->list, &mapping->dirty_pages);
72 spin_unlock(&pagecache_lock);
75 mark_inode_dirty_pages(mapping->host);
81 inline struct obdo * ll_oa_from_inode(struct inode *inode, unsigned long valid)
83 struct ll_inode_info *oinfo = ll_i2info(inode);
84 struct obdo *oa = obdo_alloc();
86 CERROR("no memory to allocate obdo!\n");
91 if ( valid & OBD_MD_FLID )
92 oa->o_id = oinfo->lli_objid;
93 if ( valid & OBD_MD_FLATIME )
94 oa->o_atime = inode->i_atime;
95 if ( valid & OBD_MD_FLMTIME )
96 oa->o_mtime = inode->i_mtime;
97 if ( valid & OBD_MD_FLCTIME )
98 oa->o_ctime = inode->i_ctime;
99 if ( valid & OBD_MD_FLSIZE )
100 oa->o_size = inode->i_size;
101 if ( valid & OBD_MD_FLBLOCKS ) /* allocation of space */
102 oa->o_blocks = inode->i_blocks;
103 if ( valid & OBD_MD_FLBLKSZ )
104 oa->o_blksize = inode->i_blksize;
105 if ( valid & OBD_MD_FLMODE )
106 oa->o_mode = inode->i_mode;
107 if ( valid & OBD_MD_FLUID )
108 oa->o_uid = inode->i_uid;
109 if ( valid & OBD_MD_FLGID )
110 oa->o_gid = inode->i_gid;
111 if ( valid & OBD_MD_FLFLAGS )
112 oa->o_flags = inode->i_flags;
113 if ( valid & OBD_MD_FLNLINK )
114 oa->o_nlink = inode->i_nlink;
115 if ( valid & OBD_MD_FLGENER )
116 oa->o_generation = inode->i_generation;
118 CDEBUG(D_INFO, "src inode %ld, dst obdo %ld valid 0x%08lx\n",
119 inode->i_ino, (long)oa->o_id, valid);
121 /* this will transfer metadata for the logical object to
122 the oa: that metadata could contain the constituent objects
124 if (ll_has_inline(inode)) {
125 CDEBUG(D_INODE, "copying inline data from inode to obdo\n");
126 memcpy(oa->o_inline, oinfo->lli_inline, OBD_INLINESZ);
127 oa->o_obdflags |= OBD_FL_INLINEDATA;
128 oa->o_valid |= OBD_MD_FLINLINE;
132 } /* ll_oa_from_inode */
137 * Remove page from dirty list
139 void __set_page_clean(struct page *page)
141 struct address_space *mapping = page->mapping;
147 list_del(&page->list);
148 list_add(&page->list, &mapping->clean_pages);
150 inode = mapping->host;
151 if (list_empty(&mapping->dirty_pages)) {
152 CDEBUG(D_INODE, "inode clean\n");
153 inode->i_state &= ~I_DIRTY_PAGES;
158 /* SYNCHRONOUS I/O to object storage for an inode */
159 static int ll_brw(int rw, struct inode *inode, struct page *page, int create)
161 obd_count num_obdo = 1;
162 obd_count bufs_per_obdo = 1;
164 obd_size count = PAGE_SIZE;
165 obd_off offset = ((obd_off)page->index) << PAGE_SHIFT;
166 obd_flag flags = create ? OBD_BRW_CREATE : 0;
170 oa = ll_oa_from_inode(inode, OBD_MD_FLNOTOBD);
174 err = obd_brw(rw, ll_i2obdconn(inode), num_obdo, &oa, &bufs_per_obdo,
175 &page, &count, &offset, &flags);
181 extern void set_page_clean(struct page *);
185 /* returns the page unlocked, but with a reference */
186 static int ll_readpage(struct file *file, struct page *page)
188 struct inode *inode = page->mapping->host;
192 if (!PageLocked(page))
195 if (((inode->i_size + PAGE_CACHE_SIZE -1)>>PAGE_SHIFT) <= page->index) {
196 memset(kmap(page), 0, PAGE_CACHE_SIZE);
198 GOTO(readpage_out, rc);
201 if (Page_Uptodate(page)) {
202 CERROR("Explain this please?\n");
203 GOTO(readpage_out, rc);
206 rc = ll_brw(OBD_BRW_READ, inode, page, 0);
211 SetPageUptodate(page);
217 static int ll_prepare_write(struct file *file, struct page *page, unsigned from,
220 struct inode *inode = page->mapping->host;
221 obd_off offset = ((obd_off)page->index) << PAGE_SHIFT;
227 if (!PageLocked(page))
230 if (Page_Uptodate(page))
231 GOTO(prepare_done, rc);
233 if (offset + from >= inode->i_size) {
234 memset(addr, 0, PAGE_SIZE);
235 GOTO(prepare_done, rc);
238 /* We're completely overwriting an existing page, so _don't_ set it up
239 * to date until commit_write */
240 if (from == 0 && to == PAGE_SIZE) {
241 memset(addr, 0, PAGE_SIZE);
245 rc = ll_brw(OBD_BRW_READ, inode, page, 0);
250 SetPageUptodate(page);
255 /* returns the page unlocked, but with a reference */
256 static int ll_writepage(struct page *page)
258 struct inode *inode = page->mapping->host;
262 if (!PageLocked(page))
265 err = ll_brw(OBD_BRW_WRITE, inode, page, 1);
267 //SetPageUptodate(page);
268 set_page_clean(page);
270 CERROR("ll_brw failure %d\n", err);
276 /* SYNCHRONOUS I/O to object storage for an inode -- object attr will be updated
278 static int ll_commit_write(struct file *file, struct page *page,
279 unsigned from, unsigned to)
282 struct inode *inode = page->mapping->host;
283 obd_count num_obdo = 1;
284 obd_count bufs_per_obdo = 1;
287 obd_off offset = (((obd_off)page->index) << PAGE_SHIFT);
288 obd_flag flags = create ? OBD_BRW_CREATE : 0;
293 oa = ll_oa_from_inode(inode, OBD_MD_FLNOTOBD);
297 SetPageUptodate(page);
299 if (!PageLocked(page))
302 CDEBUG(D_INODE, "commit_page writing (at %d) to %d, count %Ld\n",
303 from, to, (unsigned long long)count);
305 err = obd_brw(OBD_BRW_WRITE, ll_i2obdconn(inode), num_obdo, &oa,
306 &bufs_per_obdo, &page, &count, &offset, &flags);
309 if (offset + to > inode->i_size) {
310 iattr.ia_valid = ATTR_SIZE;
311 iattr.ia_size = offset + to;
312 /* do NOT truncate */
313 inode->i_size = offset + to;
315 err = ll_inode_setattr(inode, &iattr, 0);
317 CERROR("failed - %d.\n", err);
325 } /* ll_commit_write */
327 void ll_truncate(struct inode *inode)
333 oa = ll_oa_from_inode(inode, OBD_MD_FLNOTOBD);
335 CERROR("no memory to allocate obdo!\n");
339 CDEBUG(D_INFO, "calling punch for %ld (%Lu bytes at 0)\n",
340 (long)oa->o_id, (unsigned long long)oa->o_size);
341 err = obd_punch(ll_i2obdconn(inode), oa, oa->o_size, 0);
345 CERROR("obd_truncate fails (%d)\n", err);
351 int ll_direct_IO(int rw, struct inode * inode, struct kiobuf * iobuf, unsigned long blocknr, int blocksize)
354 obd_count num_obdo = 1;
355 obd_count bufs_per_obdo = iobuf->nr_pages;
356 struct obdo *oa = NULL;
357 obd_size *count = NULL;
358 obd_off *offset = NULL;
359 obd_flag *flags = NULL;
364 OBD_ALLOC(count, sizeof(obd_size) * bufs_per_obdo);
366 GOTO(out, err=-ENOMEM);
368 OBD_ALLOC(offset, sizeof(obd_off) * bufs_per_obdo);
370 GOTO(out, err=-ENOMEM);
372 OBD_ALLOC(flags, sizeof(obd_flag) * bufs_per_obdo);
374 GOTO(out, err=-ENOMEM);
376 for (i = 0 ; i < bufs_per_obdo ; i++) {
377 count[i] = PAGE_SIZE;
378 offset[i] = ((obd_off)(iobuf->maplist[i])->index) << PAGE_SHIFT;
379 flags[i] = OBD_BRW_CREATE;
382 oa = ll_oa_from_inode(inode, OBD_MD_FLNOTOBD);
386 err = obd_brw(rw, ll_i2obdconn(inode), num_obdo, &oa, &bufs_per_obdo,
387 iobuf->maplist, count, offset, flags);
389 err = bufs_per_obdo * PAGE_SIZE;
395 OBD_FREE(flags, sizeof(obd_flag) * bufs_per_obdo);
397 OBD_FREE(count, sizeof(obd_count) * bufs_per_obdo);
399 OBD_FREE(offset, sizeof(obd_off) * bufs_per_obdo);
405 struct address_space_operations ll_aops = {
406 readpage: ll_readpage,
407 writepage: ll_writepage,
408 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,4,17))
409 direct_IO: ll_direct_IO,
411 sync_page: block_sync_page,
412 prepare_write: ll_prepare_write,
413 commit_write: ll_commit_write,