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 #define DEBUG_SUBSYSTEM S_LLIGHT
29 #include <linux/obd_support.h>
30 #include <linux/lustre_lib.h>
31 #include <linux/lustre_idl.h>
32 #include <linux/lustre_mds.h>
33 #include <linux/lustre_light.h>
35 int ll_inode_setattr(struct inode *inode, struct iattr *attr, int do_trunc);
37 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,4,10))
39 * Add a page to the dirty page list.
41 void __set_page_dirty(struct page *page)
43 struct address_space *mapping;
46 pg_lock = PAGECACHE_LOCK(page);
49 mapping = page->mapping;
50 spin_lock(&mapping->page_lock);
52 list_del(&page->list);
53 list_add(&page->list, &mapping->dirty_pages);
55 spin_unlock(&mapping->page_lock);
59 mark_inode_dirty_pages(mapping->host);
63 * Add a page to the dirty page list.
65 void set_page_dirty(struct page *page)
67 if (!test_and_set_bit(PG_dirty, &page->flags)) {
68 struct address_space *mapping = page->mapping;
71 spin_lock(&pagecache_lock);
72 list_del(&page->list);
73 list_add(&page->list, &mapping->dirty_pages);
74 spin_unlock(&pagecache_lock);
77 mark_inode_dirty_pages(mapping->host);
83 inline struct obdo * ll_oa_from_inode(struct inode *inode, int valid)
85 struct ll_inode_info *oinfo = ll_i2info(inode);
86 struct obdo *oa = obdo_alloc();
88 CERROR("no memory to allocate obdo!\n");
93 if ( oa->o_valid & OBD_MD_FLID )
94 oa->o_id = oinfo->lli_objid;
95 if ( oa->o_valid & OBD_MD_FLATIME )
96 oa->o_atime = inode->i_atime;
97 if ( oa->o_valid & OBD_MD_FLMTIME )
98 oa->o_mtime = inode->i_mtime;
99 if ( oa->o_valid & OBD_MD_FLCTIME )
100 oa->o_ctime = inode->i_ctime;
101 if ( oa->o_valid & OBD_MD_FLSIZE )
102 oa->o_size = inode->i_size;
103 if ( oa->o_valid & OBD_MD_FLBLOCKS ) /* allocation of space */
104 oa->o_blocks = inode->i_blocks;
105 if ( oa->o_valid & OBD_MD_FLBLKSZ )
106 oa->o_blksize = inode->i_blksize;
107 if ( oa->o_valid & OBD_MD_FLMODE )
108 oa->o_mode = inode->i_mode;
109 if ( oa->o_valid & OBD_MD_FLUID )
110 oa->o_uid = inode->i_uid;
111 if ( oa->o_valid & OBD_MD_FLGID )
112 oa->o_gid = inode->i_gid;
113 if ( oa->o_valid & OBD_MD_FLFLAGS )
114 oa->o_flags = inode->i_flags;
115 if ( oa->o_valid & OBD_MD_FLNLINK )
116 oa->o_nlink = inode->i_nlink;
117 if ( oa->o_valid & OBD_MD_FLGENER )
118 oa->o_generation = inode->i_generation;
120 CDEBUG(D_INFO, "src inode %ld, dst obdo %ld valid 0x%08x\n",
121 inode->i_ino, (long)oa->o_id, oa->o_valid);
123 /* this will transfer metadata for the logical object to
124 the oa: that metadata could contain the constituent objects
126 if (ll_has_inline(inode)) {
127 CDEBUG(D_INODE, "copying inline data from inode to obdo\n");
128 memcpy(oa->o_inline, oinfo->lli_inline, OBD_INLINESZ);
129 oa->o_obdflags |= OBD_FL_INLINEDATA;
130 oa->o_valid |= OBD_MD_FLINLINE;
134 } /* ll_oa_from_inode */
139 * Remove page from dirty list
141 void __set_page_clean(struct page *page)
143 struct address_space *mapping = page->mapping;
149 list_del(&page->list);
150 list_add(&page->list, &mapping->clean_pages);
152 inode = mapping->host;
153 if (list_empty(&mapping->dirty_pages)) {
154 CDEBUG(D_INODE, "inode clean\n");
155 inode->i_state &= ~I_DIRTY_PAGES;
160 /* SYNCHRONOUS I/O to object storage for an inode */
161 static int ll_brw(int rw, struct inode *inode, struct page *page, int create)
163 obd_count num_obdo = 1;
164 obd_count bufs_per_obdo = 1;
166 obd_size count = PAGE_SIZE;
167 obd_off offset = ((obd_off)page->index) << PAGE_SHIFT;
168 obd_flag flags = create ? OBD_BRW_CREATE : 0;
173 oa = ll_oa_from_inode(inode, OBD_MD_FLNOTOBD);
177 err = obd_brw(rw, ll_i2obdconn(inode), num_obdo, &oa, &bufs_per_obdo,
178 &page, &count, &offset, &flags);
185 extern void set_page_clean(struct page *);
189 /* returns the page unlocked, but with a reference */
190 int ll_readpage(struct file *file, struct page *page)
192 struct inode *inode = page->mapping->host;
197 if ( ((inode->i_size + PAGE_CACHE_SIZE -1)>>PAGE_SHIFT)
199 memset(kmap(page), 0, PAGE_CACHE_SIZE);
204 if (Page_Uptodate(page)) {
209 rc = ll_brw(OBD_BRW_READ, inode, page, 0);
216 SetPageUptodate(page);
217 obd_unlock_page(page);
223 int ll_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
225 struct inode *inode = page->mapping->host;
226 obd_off offset = ((obd_off)page->index) << PAGE_SHIFT;
231 if (Page_Uptodate(page)) {
236 if ( (from <= offset) && (to >= offset + PAGE_SIZE) ) {
241 rc = ll_brw(OBD_BRW_READ, inode, page, 0);
243 SetPageUptodate(page);
247 set_page_dirty(page);
252 /* returns the page unlocked, but with a reference */
253 int ll_writepage(struct page *page)
255 struct inode *inode = page->mapping->host;
259 err = ll_brw(OBD_BRW_WRITE, inode, page, 1);
261 SetPageUptodate(page);
262 set_page_clean(page);
264 CERROR("ll_brw failure %d\n", err);
270 /* SYNCHRONOUS I/O to object storage for an inode -- object attr will be updated too */
271 int ll_commit_write(struct file *file, struct page *page,
272 unsigned from, unsigned to)
275 struct inode *inode = page->mapping->host;
276 obd_count num_obdo = 1;
277 obd_count bufs_per_obdo = 1;
280 obd_off offset = (((obd_off)page->index) << PAGE_SHIFT);
281 obd_flag flags = create ? OBD_BRW_CREATE : 0;
286 oa = ll_oa_from_inode(inode, OBD_MD_FLNOTOBD);
291 CDEBUG(D_INODE, "commit_page writing (at %d) to %d, count %Ld\n",
294 err = obd_brw(OBD_BRW_WRITE, ll_i2obdconn(inode), num_obdo, &oa, &bufs_per_obdo,
295 &page, &count, &offset, &flags);
297 SetPageUptodate(page);
298 set_page_clean(page);
302 if (offset + to > inode->i_size) {
303 iattr.ia_valid = ATTR_SIZE;
304 iattr.ia_size = offset + to;
305 /* do NOT truncate */
306 err = ll_inode_setattr(inode, &iattr, 0);
308 CERROR("failed - %d.\n", err);
320 void ll_truncate(struct inode *inode)
326 oa = ll_oa_from_inode(inode, OBD_MD_FLNOTOBD);
328 CERROR("no memory to allocate obdo!\n");
332 CDEBUG(D_INFO, "calling punch for %ld (%Lu bytes at 0)\n",
333 (long)oa->o_id, oa->o_size);
334 err = obd_punch(ll_i2obdconn(inode), oa, oa->o_size, 0);
338 CERROR("obd_truncate fails (%d)\n", err);
344 struct address_space_operations ll_aops = {
345 readpage: ll_readpage,
346 writepage: ll_writepage,
347 sync_page: block_sync_page,
348 prepare_write: ll_prepare_write,
349 commit_write: ll_commit_write,