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/errno.h>
15 #include <linux/locks.h>
16 #include <linux/unistd.h>
17 #include <linux/version.h>
18 #include <asm/system.h>
19 #include <asm/uaccess.h>
22 #include <linux/stat.h>
23 #include <asm/uaccess.h>
24 #include <asm/segment.h>
26 #include <linux/pagemap.h>
27 #include <linux/smp_lock.h>
29 #define DEBUG_SUBSYSTEM S_LLITE
31 #include <linux/lustre_mds.h>
32 #include <linux/lustre_lite.h>
34 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,4,10))
36 * Add a page to the dirty page list.
38 void __set_page_dirty(struct page *page)
40 struct address_space *mapping;
43 pg_lock = PAGECACHE_LOCK(page);
46 mapping = page->mapping;
47 spin_lock(&mapping->page_lock);
49 list_del(&page->list);
50 list_add(&page->list, &mapping->dirty_pages);
52 spin_unlock(&mapping->page_lock);
56 mark_inode_dirty_pages(mapping->host);
60 * Add a page to the dirty page list.
62 void set_page_dirty(struct page *page)
64 if (!test_and_set_bit(PG_dirty, &page->flags)) {
65 struct address_space *mapping = page->mapping;
68 spin_lock(&pagecache_lock);
69 list_del(&page->list);
70 list_add(&page->list, &mapping->dirty_pages);
71 spin_unlock(&pagecache_lock);
74 mark_inode_dirty_pages(mapping->host);
80 inline struct obdo * ll_oa_from_inode(struct inode *inode, int valid)
82 struct ll_inode_info *oinfo = ll_i2info(inode);
83 struct obdo *oa = obdo_alloc();
85 CERROR("no memory to allocate obdo!\n");
90 if ( oa->o_valid & OBD_MD_FLID )
91 oa->o_id = oinfo->lli_objid;
92 if ( oa->o_valid & OBD_MD_FLATIME )
93 oa->o_atime = inode->i_atime;
94 if ( oa->o_valid & OBD_MD_FLMTIME )
95 oa->o_mtime = inode->i_mtime;
96 if ( oa->o_valid & OBD_MD_FLCTIME )
97 oa->o_ctime = inode->i_ctime;
98 if ( oa->o_valid & OBD_MD_FLSIZE )
99 oa->o_size = inode->i_size;
100 if ( oa->o_valid & OBD_MD_FLBLOCKS ) /* allocation of space */
101 oa->o_blocks = inode->i_blocks;
102 if ( oa->o_valid & OBD_MD_FLBLKSZ )
103 oa->o_blksize = inode->i_blksize;
104 if ( oa->o_valid & OBD_MD_FLMODE )
105 oa->o_mode = inode->i_mode;
106 if ( oa->o_valid & OBD_MD_FLUID )
107 oa->o_uid = inode->i_uid;
108 if ( oa->o_valid & OBD_MD_FLGID )
109 oa->o_gid = inode->i_gid;
110 if ( oa->o_valid & OBD_MD_FLFLAGS )
111 oa->o_flags = inode->i_flags;
112 if ( oa->o_valid & OBD_MD_FLNLINK )
113 oa->o_nlink = inode->i_nlink;
114 if ( oa->o_valid & OBD_MD_FLGENER )
115 oa->o_generation = inode->i_generation;
117 CDEBUG(D_INFO, "src inode %ld, dst obdo %ld valid 0x%08x\n",
118 inode->i_ino, (long)oa->o_id, oa->o_valid);
120 /* this will transfer metadata for the logical object to
121 the oa: that metadata could contain the constituent objects
123 if (ll_has_inline(inode)) {
124 CDEBUG(D_INODE, "copying inline data from inode to obdo\n");
125 memcpy(oa->o_inline, oinfo->lli_inline, OBD_INLINESZ);
126 oa->o_obdflags |= OBD_FL_INLINEDATA;
127 oa->o_valid |= OBD_MD_FLINLINE;
131 } /* ll_oa_from_inode */
136 * Remove page from dirty list
138 void __set_page_clean(struct page *page)
140 struct address_space *mapping = page->mapping;
146 list_del(&page->list);
147 list_add(&page->list, &mapping->clean_pages);
149 inode = mapping->host;
150 if (list_empty(&mapping->dirty_pages)) {
151 CDEBUG(D_INODE, "inode clean\n");
152 inode->i_state &= ~I_DIRTY_PAGES;
157 /* SYNCHRONOUS I/O to object storage for an inode */
158 static int ll_brw(int rw, struct inode *inode, struct page *page, int create)
160 obd_count num_obdo = 1;
161 obd_count bufs_per_obdo = 1;
163 obd_size count = PAGE_SIZE;
164 obd_off offset = ((obd_off)page->index) << PAGE_SHIFT;
165 obd_flag flags = create ? OBD_BRW_CREATE : 0;
169 oa = ll_oa_from_inode(inode, OBD_MD_FLNOTOBD);
173 err = obd_brw(rw, ll_i2obdconn(inode), num_obdo, &oa, &bufs_per_obdo,
174 &page, &count, &offset, &flags);
180 extern void set_page_clean(struct page *);
184 /* returns the page unlocked, but with a reference */
185 static int ll_readpage(struct file *file, struct page *page)
187 struct inode *inode = page->mapping->host;
191 if (!PageLocked(page))
194 if (((inode->i_size + PAGE_CACHE_SIZE -1)>>PAGE_SHIFT) <= page->index) {
195 memset(kmap(page), 0, PAGE_CACHE_SIZE);
197 GOTO(readpage_out, rc);
200 if (Page_Uptodate(page)) {
201 CERROR("Explain this please?\n");
202 GOTO(readpage_out, rc);
205 rc = ll_brw(OBD_BRW_READ, inode, page, 0);
210 SetPageUptodate(page);
216 static int ll_prepare_write(struct file *file, struct page *page, unsigned from,
219 struct inode *inode = page->mapping->host;
220 obd_off offset = ((obd_off)page->index) << PAGE_SHIFT;
226 if (!PageLocked(page))
229 if (Page_Uptodate(page))
230 GOTO(prepare_done, rc);
232 if (offset + from >= inode->i_size) {
233 memset(addr, 0, PAGE_SIZE);
234 GOTO(prepare_done, rc);
237 /* We're completely overwriting an existing page, so _don't_ set it up
238 * to date until commit_write */
239 if (from == 0 && to == PAGE_SIZE) {
240 memset(addr, 0, PAGE_SIZE);
244 rc = ll_brw(OBD_BRW_READ, inode, page, 0);
249 SetPageUptodate(page);
254 /* returns the page unlocked, but with a reference */
255 static int ll_writepage(struct page *page)
257 struct inode *inode = page->mapping->host;
263 if (!PageLocked(page))
266 err = ll_brw(OBD_BRW_WRITE, inode, page, 1);
268 //SetPageUptodate(page);
269 set_page_clean(page);
271 CERROR("ll_brw failure %d\n", err);
277 /* SYNCHRONOUS I/O to object storage for an inode -- object attr will be updated
279 static int ll_commit_write(struct file *file, struct page *page,
280 unsigned from, unsigned to)
283 struct inode *inode = page->mapping->host;
284 obd_count num_obdo = 1;
285 obd_count bufs_per_obdo = 1;
288 obd_off offset = (((obd_off)page->index) << PAGE_SHIFT);
289 obd_flag flags = create ? OBD_BRW_CREATE : 0;
294 oa = ll_oa_from_inode(inode, OBD_MD_FLNOTOBD);
298 SetPageUptodate(page);
300 if (!PageLocked(page))
303 CDEBUG(D_INODE, "commit_page writing (at %d) to %d, count %Ld\n",
306 err = obd_brw(OBD_BRW_WRITE, ll_i2obdconn(inode), num_obdo, &oa,
307 &bufs_per_obdo, &page, &count, &offset, &flags);
310 if (offset + to > inode->i_size) {
311 iattr.ia_valid = ATTR_SIZE;
312 iattr.ia_size = offset + to;
313 /* do NOT truncate */
314 inode->i_size = offset + to;
316 err = ll_inode_setattr(inode, &iattr, 0);
318 CERROR("failed - %d.\n", err);
326 } /* ll_commit_write */
328 void ll_truncate(struct inode *inode)
334 oa = ll_oa_from_inode(inode, OBD_MD_FLNOTOBD);
336 CERROR("no memory to allocate obdo!\n");
340 CDEBUG(D_INFO, "calling punch for %ld (%Lu bytes at 0)\n",
341 (long)oa->o_id, oa->o_size);
342 err = obd_punch(ll_i2obdconn(inode), oa, oa->o_size, 0);
346 CERROR("obd_truncate fails (%d)\n", err);
352 struct address_space_operations ll_aops = {
353 readpage: ll_readpage,
354 writepage: ll_writepage,
355 sync_page: block_sync_page,
356 prepare_write: ll_prepare_write,
357 commit_write: ll_commit_write,