2 * Lustre Light I/O Page Cache
4 * Copyright (C) 2002, Cluster File Systems, Inc.
7 #include <linux/config.h>
8 #include <linux/kernel.h>
10 #include <linux/string.h>
11 #include <linux/stat.h>
12 #include <linux/errno.h>
13 #include <linux/locks.h>
14 #include <linux/unistd.h>
15 #include <linux/version.h>
16 #include <asm/system.h>
17 #include <asm/uaccess.h>
20 #include <linux/stat.h>
21 #include <asm/uaccess.h>
22 #include <asm/segment.h>
24 #include <linux/pagemap.h>
25 #include <linux/smp_lock.h>
27 #include <linux/obd_support.h>
28 #include <linux/lustre_lib.h>
29 #include <linux/lustre_idl.h>
30 #include <linux/lustre_mds.h>
31 #include <linux/lustre_light.h>
33 int ll_inode_setattr(struct inode *inode, struct iattr *attr, int do_trunc);
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, int valid)
83 struct ll_inode_info *oinfo = ll_i2info(inode);
84 struct obdo *oa = obdo_alloc();
86 printk(__FUNCTION__ ": no memory to allocate obdo!\n");
91 if ( oa->o_valid & OBD_MD_FLID )
92 oa->o_id = oinfo->lli_objid;
93 if ( oa->o_valid & OBD_MD_FLATIME )
94 oa->o_atime = inode->i_atime;
95 if ( oa->o_valid & OBD_MD_FLMTIME )
96 oa->o_mtime = inode->i_mtime;
97 if ( oa->o_valid & OBD_MD_FLCTIME )
98 oa->o_ctime = inode->i_ctime;
99 if ( oa->o_valid & OBD_MD_FLSIZE )
100 oa->o_size = inode->i_size;
101 if ( oa->o_valid & OBD_MD_FLBLOCKS ) /* allocation of space */
102 oa->o_blocks = inode->i_blocks;
103 if ( oa->o_valid & OBD_MD_FLBLKSZ )
104 oa->o_blksize = inode->i_blksize;
105 if ( oa->o_valid & OBD_MD_FLMODE )
106 oa->o_mode = inode->i_mode;
107 if ( oa->o_valid & OBD_MD_FLUID )
108 oa->o_uid = inode->i_uid;
109 if ( oa->o_valid & OBD_MD_FLGID )
110 oa->o_gid = inode->i_gid;
111 if ( oa->o_valid & OBD_MD_FLFLAGS )
112 oa->o_flags = inode->i_flags;
113 if ( oa->o_valid & OBD_MD_FLNLINK )
114 oa->o_nlink = inode->i_nlink;
115 if ( oa->o_valid & OBD_MD_FLGENER )
116 oa->o_generation = inode->i_generation;
118 CDEBUG(D_INFO, "src inode %ld, dst obdo %ld valid 0x%08x\n",
119 inode->i_ino, (long)oa->o_id, oa->o_valid);
120 obdo_from_inode(oa, inode);
122 /* this will transfer metadata for the logical object to
123 the oa: that metadata could contain the constituent objects
125 if (ll_has_inline(inode)) {
126 CDEBUG(D_INODE, "copying inline data from inode to obdo\n");
127 memcpy(oa->o_inline, oinfo->lli_inline, OBD_INLINESZ);
128 oa->o_obdflags |= OBD_FL_INLINEDATA;
129 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;
171 oa = ll_oa_from_inode(inode, OBD_MD_FLNOTOBD);
175 err = obd_brw(rw, IID(inode), num_obdo, &oa, &bufs_per_obdo,
176 &page, &count, &offset, &flags);
183 extern void set_page_clean(struct page *);
187 /* returns the page unlocked, but with a reference */
188 int ll_readpage(struct file *file, struct page *page)
190 struct inode *inode = page->mapping->host;
195 if ( ((inode->i_size + PAGE_CACHE_SIZE -1)>>PAGE_SHIFT)
197 memset(kmap(page), 0, PAGE_CACHE_SIZE);
202 if (Page_Uptodate(page)) {
207 rc = ll_brw(OBD_BRW_READ, inode, page, 0);
214 SetPageUptodate(page);
215 obd_unlock_page(page);
221 int ll_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
223 struct inode *inode = page->mapping->host;
224 obd_off offset = ((obd_off)page->index) << PAGE_SHIFT;
229 if (Page_Uptodate(page)) {
234 if ( (from <= offset) && (to >= offset + PAGE_SIZE) ) {
239 rc = ll_brw(OBD_BRW_READ, inode, page, 0);
241 SetPageUptodate(page);
245 set_page_dirty(page);
250 /* returns the page unlocked, but with a reference */
251 int ll_writepage(struct page *page)
253 struct inode *inode = page->mapping->host;
257 err = ll_brw(OBD_BRW_WRITE, inode, page, 1);
259 SetPageUptodate(page);
260 set_page_clean(page);
262 printk(__FUNCTION__ ": ll_brw failure %d\n", err);
268 /* SYNCHRONOUS I/O to object storage for an inode -- object attr will be updated too */
269 int ll_commit_write(struct file *file, struct page *page,
270 unsigned from, unsigned to)
273 struct inode *inode = page->mapping->host;
274 obd_count num_obdo = 1;
275 obd_count bufs_per_obdo = 1;
278 obd_off offset = (((obd_off)page->index) << PAGE_SHIFT) + to;
279 obd_flag flags = create ? OBD_BRW_CREATE : 0;
284 oa = ll_oa_from_inode(inode, OBD_MD_FLNOTOBD);
289 CDEBUG(D_INODE, "commit_page writing (at %d) to %d, count %Ld\n",
292 err = obd_brw(OBD_BRW_WRITE, IID(inode), num_obdo, &oa, &bufs_per_obdo,
293 &page, &count, &offset, &flags);
295 SetPageUptodate(page);
296 set_page_clean(page);
300 if (offset > inode->i_size) {
301 iattr.ia_valid = ATTR_SIZE;
302 iattr.ia_size = offset;
303 /* do NOT truncate */
304 err = ll_inode_setattr(inode, &iattr, 0);
306 printk(__FUNCTION__ ": failed - %d.\n", err);
318 void ll_truncate(struct inode *inode)
324 oa = ll_oa_from_inode(inode, OBD_MD_FLNOTOBD);
326 printk(__FUNCTION__ ": no memory to allocate obdo!\n");
330 CDEBUG(D_INFO, "calling punch for %ld (%Lu bytes at 0)\n",
331 (long)oa->o_id, oa->o_size);
332 err = obd_punch(IID(inode), oa, oa->o_size, 0);
336 printk(__FUNCTION__ ": obd_truncate fails (%d)\n", err);
342 struct address_space_operations ll_aops = {
343 readpage: ll_readpage,
344 writepage: ll_writepage,
345 sync_page: block_sync_page,
346 prepare_write: ll_prepare_write,
347 commit_write: ll_commit_write,