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/obd_class.h>
31 #include <linux/lustre_lib.h>
32 #include <linux/lustre_idl.h>
33 #include <linux/lustre_mds.h>
34 #include <linux/lustre_light.h>
36 int ll_inode_setattr(struct inode *inode, struct iattr *attr, int do_trunc);
38 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,4,10))
40 * Add a page to the dirty page list.
42 void __set_page_dirty(struct page *page)
44 struct address_space *mapping;
47 pg_lock = PAGECACHE_LOCK(page);
50 mapping = page->mapping;
51 spin_lock(&mapping->page_lock);
53 list_del(&page->list);
54 list_add(&page->list, &mapping->dirty_pages);
56 spin_unlock(&mapping->page_lock);
60 mark_inode_dirty_pages(mapping->host);
64 * Add a page to the dirty page list.
66 void set_page_dirty(struct page *page)
68 if (!test_and_set_bit(PG_dirty, &page->flags)) {
69 struct address_space *mapping = page->mapping;
72 spin_lock(&pagecache_lock);
73 list_del(&page->list);
74 list_add(&page->list, &mapping->dirty_pages);
75 spin_unlock(&pagecache_lock);
78 mark_inode_dirty_pages(mapping->host);
84 inline struct obdo * ll_oa_from_inode(struct inode *inode, int valid)
86 struct ll_inode_info *oinfo = ll_i2info(inode);
87 struct obdo *oa = obdo_alloc();
89 CERROR("no memory to allocate obdo!\n");
94 if ( oa->o_valid & OBD_MD_FLID )
95 oa->o_id = oinfo->lli_objid;
96 if ( oa->o_valid & OBD_MD_FLATIME )
97 oa->o_atime = inode->i_atime;
98 if ( oa->o_valid & OBD_MD_FLMTIME )
99 oa->o_mtime = inode->i_mtime;
100 if ( oa->o_valid & OBD_MD_FLCTIME )
101 oa->o_ctime = inode->i_ctime;
102 if ( oa->o_valid & OBD_MD_FLSIZE )
103 oa->o_size = inode->i_size;
104 if ( oa->o_valid & OBD_MD_FLBLOCKS ) /* allocation of space */
105 oa->o_blocks = inode->i_blocks;
106 if ( oa->o_valid & OBD_MD_FLBLKSZ )
107 oa->o_blksize = inode->i_blksize;
108 if ( oa->o_valid & OBD_MD_FLMODE )
109 oa->o_mode = inode->i_mode;
110 if ( oa->o_valid & OBD_MD_FLUID )
111 oa->o_uid = inode->i_uid;
112 if ( oa->o_valid & OBD_MD_FLGID )
113 oa->o_gid = inode->i_gid;
114 if ( oa->o_valid & OBD_MD_FLFLAGS )
115 oa->o_flags = inode->i_flags;
116 if ( oa->o_valid & OBD_MD_FLNLINK )
117 oa->o_nlink = inode->i_nlink;
118 if ( oa->o_valid & OBD_MD_FLGENER )
119 oa->o_generation = inode->i_generation;
121 CDEBUG(D_INFO, "src inode %ld, dst obdo %ld valid 0x%08x\n",
122 inode->i_ino, (long)oa->o_id, oa->o_valid);
124 /* this will transfer metadata for the logical object to
125 the oa: that metadata could contain the constituent objects
127 if (ll_has_inline(inode)) {
128 CDEBUG(D_INODE, "copying inline data from inode to obdo\n");
129 memcpy(oa->o_inline, oinfo->lli_inline, OBD_INLINESZ);
130 oa->o_obdflags |= OBD_FL_INLINEDATA;
131 oa->o_valid |= OBD_MD_FLINLINE;
135 } /* ll_oa_from_inode */
140 * Remove page from dirty list
142 void __set_page_clean(struct page *page)
144 struct address_space *mapping = page->mapping;
150 list_del(&page->list);
151 list_add(&page->list, &mapping->clean_pages);
153 inode = mapping->host;
154 if (list_empty(&mapping->dirty_pages)) {
155 CDEBUG(D_INODE, "inode clean\n");
156 inode->i_state &= ~I_DIRTY_PAGES;
161 /* SYNCHRONOUS I/O to object storage for an inode */
162 static int ll_brw(int rw, struct inode *inode, struct page *page, int create)
164 obd_count num_obdo = 1;
165 obd_count bufs_per_obdo = 1;
167 obd_size count = PAGE_SIZE;
168 obd_off offset = ((obd_off)page->index) << PAGE_SHIFT;
169 obd_flag flags = create ? OBD_BRW_CREATE : 0;
174 oa = ll_oa_from_inode(inode, OBD_MD_FLNOTOBD);
178 err = obd_brw(rw, ll_i2obdconn(inode), num_obdo, &oa, &bufs_per_obdo,
179 &page, &count, &offset, &flags);
186 extern void set_page_clean(struct page *);
190 /* returns the page unlocked, but with a reference */
191 static int ll_readpage(struct file *file, struct page *page)
193 struct inode *inode = page->mapping->host;
198 if (!PageLocked(page))
201 if ( ((inode->i_size + PAGE_CACHE_SIZE -1)>>PAGE_SHIFT)
203 memset(kmap(page), 0, PAGE_CACHE_SIZE);
209 if (Page_Uptodate(page)) {
210 CERROR("Explain this please?\n");
215 rc = ll_brw(OBD_BRW_READ, inode, page, 0);
220 SetPageUptodate(page);
226 static int ll_prepare_write(struct file *file, struct page *page, unsigned from,
229 struct inode *inode = page->mapping->host;
230 obd_off offset = ((obd_off)page->index) << PAGE_SHIFT;
236 if (!PageLocked(page))
239 if (Page_Uptodate(page)) {
244 if ( offset + from >= inode->i_size ) {
245 memset(addr, 0, PAGE_SIZE);
250 rc = ll_brw(OBD_BRW_READ, inode, page, 0);
254 SetPageUptodate(page);
260 /* returns the page unlocked, but with a reference */
261 static int ll_writepage(struct page *page)
263 struct inode *inode = page->mapping->host;
269 if (!PageLocked(page))
272 err = ll_brw(OBD_BRW_WRITE, inode, page, 1);
274 //SetPageUptodate(page);
275 set_page_clean(page);
277 CERROR("ll_brw failure %d\n", err);
284 /* SYNCHRONOUS I/O to object storage for an inode -- object attr will be updated
286 static int ll_commit_write(struct file *file, struct page *page,
287 unsigned from, unsigned to)
290 struct inode *inode = page->mapping->host;
291 obd_count num_obdo = 1;
292 obd_count bufs_per_obdo = 1;
295 obd_off offset = (((obd_off)page->index) << PAGE_SHIFT);
296 obd_flag flags = create ? OBD_BRW_CREATE : 0;
301 oa = ll_oa_from_inode(inode, OBD_MD_FLNOTOBD);
306 if (!PageLocked(page))
308 if (!Page_Uptodate(page))
311 CDEBUG(D_INODE, "commit_page writing (at %d) to %d, count %Ld\n",
314 err = obd_brw(OBD_BRW_WRITE, ll_i2obdconn(inode), num_obdo, &oa,
315 &bufs_per_obdo, &page, &count, &offset, &flags);
318 if (offset + to > inode->i_size) {
319 iattr.ia_valid = ATTR_SIZE;
320 iattr.ia_size = offset + to;
321 /* do NOT truncate */
322 err = ll_inode_setattr(inode, &iattr, 0);
324 CERROR("failed - %d.\n", err);
332 } /* ll_commit_write */
334 void ll_truncate(struct inode *inode)
340 oa = ll_oa_from_inode(inode, OBD_MD_FLNOTOBD);
342 CERROR("no memory to allocate obdo!\n");
346 CDEBUG(D_INFO, "calling punch for %ld (%Lu bytes at 0)\n",
347 (long)oa->o_id, oa->o_size);
348 err = obd_punch(ll_i2obdconn(inode), oa, oa->o_size, 0);
352 CERROR("obd_truncate fails (%d)\n", err);
358 struct address_space_operations ll_aops = {
359 readpage: ll_readpage,
360 writepage: ll_writepage,
361 sync_page: block_sync_page,
362 prepare_write: ll_prepare_write,
363 commit_write: ll_commit_write,