+++ /dev/null
-/*
- * OBDFS Super operations
- *
- * This code is issued under the GNU General Public License.
- * See the file COPYING in this distribution
- *
- * Copyright (C) 1996, 1997, Olaf Kirch <okir@monad.swb.de>
- * Copryright (C) 1999 Stelias Computing Inc,
- * (author Peter J. Braam <braam@stelias.com>)
- * Copryright (C) 1999 Seagate Technology Inc.
-*/
-
-
-#include <linux/config.h>
-#include <linux/kernel.h>
-#include <linux/mm.h>
-#include <linux/string.h>
-#include <linux/stat.h>
-#include <linux/errno.h>
-#include <linux/locks.h>
-#include <linux/unistd.h>
-#include <linux/version.h>
-
-#include <asm/system.h>
-#include <asm/uaccess.h>
-
-#include <linux/fs.h>
-#include <linux/stat.h>
-#include <asm/uaccess.h>
-#include <linux/vmalloc.h>
-#include <asm/segment.h>
-#include <linux/mm.h>
-#include <linux/pagemap.h>
-#include <linux/smp_lock.h>
-
-#define DEBUG_SUBSYSTEM S_OBDFS
-
-#include <linux/obd_support.h>
-#include <linux/obd_ext2.h>
-#include <linux/obdfs.h>
-
-void obdfs_change_inode(struct inode *inode);
-
-static int cache_writes = 0;
-
-
-/* page cache support stuff */
-
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,4,10)
-/*
- * Add a page to the dirty page list.
- */
-void __set_page_dirty(struct page *page)
-{
- struct address_space *mapping;
- spinlock_t *pg_lock;
-
- pg_lock = PAGECACHE_LOCK(page);
- spin_lock(pg_lock);
-
- mapping = page->mapping;
- spin_lock(&mapping->page_lock);
-
- list_del(&page->list);
- list_add(&page->list, &mapping->dirty_pages);
-
- spin_unlock(&mapping->page_lock);
- spin_unlock(pg_lock);
-
- if (mapping->host)
- mark_inode_dirty_pages(mapping->host);
-}
-/*
- * Remove page from dirty list
- */
-void __set_page_clean(struct page *page)
-{
- struct address_space *mapping = page->mapping;
- struct inode *inode;
-
- if (!mapping)
- return;
-
- list_del(&page->list);
- list_add(&page->list, &mapping->clean_pages);
-
- inode = mapping->host;
- if (list_empty(&mapping->dirty_pages)) {
- CDEBUG(D_INODE, "inode clean\n");
- inode->i_state &= ~I_DIRTY_PAGES;
- }
- EXIT;
-}
-
-#else
-/*
- * Add a page to the dirty page list.
- */
-void set_page_dirty(struct page *page)
-{
- if (!test_and_set_bit(PG_dirty, &page->flags)) {
- struct address_space *mapping = page->mapping;
-
- if (mapping) {
- spin_lock(&pagecache_lock);
- list_del(&page->list);
- list_add(&page->list, &mapping->dirty_pages);
- spin_unlock(&pagecache_lock);
-
- if (mapping->host)
- mark_inode_dirty_pages(mapping->host);
- }
- }
-}
-/*
- * Remove page from dirty list
- */
-void __set_page_clean(struct page *page)
-{
- struct address_space *mapping = page->mapping;
- struct inode *inode;
-
- if (!mapping)
- return;
-
- spin_lock(&pagecache_lock);
- list_del(&page->list);
- list_add(&page->list, &mapping->clean_pages);
-
- inode = mapping->host;
- if (list_empty(&mapping->dirty_pages)) {
- CDEBUG(D_INODE, "inode clean\n");
- inode->i_state &= ~I_DIRTY_PAGES;
- }
- spin_unlock(&pagecache_lock);
- EXIT;
-}
-
-#endif
-
-
-inline void set_page_clean(struct page *page)
-{
- if (PageDirty(page)) {
- ClearPageDirty(page);
- __set_page_clean(page);
- }
-}
-
-/* SYNCHRONOUS I/O to object storage for an inode -- object attr will be updated too */
-static int obdfs_brw(int rw, struct inode *inode2,
- struct page *page, int create)
-{
- struct inode *inode = page->mapping->host;
- struct ll_inode_info *lii = ll_i2info(inode);
- obd_size count = PAGE_SIZE;
- obd_off offset = ((obd_off)page->index) << PAGE_SHIFT;
- obd_flag flags = create ? OBD_BRW_CREATE : 0;
- int err;
-
- ENTRY;
-
- CHECK_MOUNT_EPOCH(inode);
- CHECK_MOUNT_EPOCH(inode2);
-
- err = obd_brw(rw == WRITE ? OBD_BRW_WRITE : OBD_BRW_READ, IID(inode),
- md, 1, &page, &count, &offset,
- &flags, NULL);
- //if ( !err )
- // obdfs_to_inode(inode, oa); /* copy o_blocks to i_blocks */
-
- obdo_free(oa);
- EXIT;
- return err;
-} /* obdfs_brw */
-
-/* SYNCHRONOUS I/O to object storage for an inode -- object attr will be updated too */
-static int obdfs_commit_page(struct page *page, int create, int from, int to)
-{
- struct inode *inode = page->mapping->host;
- obd_count num_obdo = 1;
- obd_count bufs_per_obdo = 1;
- struct obdo *oa;
- obd_size count = to;
- obd_off offset = (((obd_off)page->index) << PAGE_SHIFT);
- obd_flag flags = create ? OBD_BRW_CREATE : 0;
- int err;
-
- ENTRY;
-
- CDEBUG(D_INODE, "commit_page writing (at %d) to %d, count %Ld\n",
- from, to, (unsigned long long)count);
-
- err = obd_brw(OBD_BRW_WRITE, IID(inode), md, 1,
- &page, &count, &offset, &flags, NULL);
- if ( !err ) {
- SetPageUptodate(page);
- set_page_clean(page);
- }
-
- //if ( !err )
- // obdfs_to_inode(inode, oa); /* copy o_blocks to i_blocks */
-
- obdo_free(oa);
- EXIT;
- return err;
-} /* obdfs_brw */
-
-/* returns the page unlocked, but with a reference */
-int obdfs_writepage(struct page *page)
-{
- int rc;
- struct inode *inode = page->mapping->host;
- ENTRY;
- CERROR("---> writepage called ino %ld!\n", inode->i_ino);
- LBUG();
- rc = obdfs_brw(OBD_BRW_WRITE, inode, page, 1);
- if ( !rc ) {
- set_page_clean(page);
- } else {
- CDEBUG(D_INODE, "--> GRR %d\n", rc);
- }
- EXIT;
- return rc;
-}
-
-
-void write_inode_pages(struct inode *inode)
-{
- struct list_head *tmp = &inode->i_mapping->dirty_pages;
-
- while ( (tmp = tmp->next) != &inode->i_mapping->dirty_pages) {
- struct page *page;
- page = list_entry(tmp, struct page, list);
- obdfs_writepage(page);
- }
-}
-
-
-/* returns the page unlocked, but with a reference */
-int obdfs_readpage(struct file *file, struct page *page)
-{
- struct inode *inode = page->mapping->host;
- int rc;
-
- ENTRY;
-
- if ( ((inode->i_size + PAGE_CACHE_SIZE -1)>>PAGE_SHIFT)
- <= page->index) {
- memset(kmap(page), 0, PAGE_CACHE_SIZE);
- kunmap(page);
- goto readpage_out;
- }
-
- if (Page_Uptodate(page)) {
- EXIT;
- goto readpage_out;
- }
-
- rc = obdfs_brw(OBD_BRW_READ, inode, page, 0);
- if ( rc ) {
- EXIT;
- return rc;
- }
-
- readpage_out:
- SetPageUptodate(page);
- UnlockPage(page);
- EXIT;
- return 0;
-} /* obdfs_readpage */
-
-int obdfs_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
-{
- struct inode *inode = page->mapping->host;
- obd_off offset = ((obd_off)page->index) << PAGE_SHIFT;
- int rc = 0;
- ENTRY;
-
- kmap(page);
- if (Page_Uptodate(page)) {
- EXIT;
- goto prepare_done;
- }
-
- if ( (from <= offset) && (to >= offset + PAGE_SIZE) ) {
- EXIT;
- return 0;
- }
-
- rc = obdfs_brw(OBD_BRW_READ, inode, page, 0);
- if (!rc)
- SetPageUptodate(page);
-
- prepare_done:
- set_page_dirty(page);
- //SetPageDirty(page);
- EXIT;
- return rc;
-}
-
-
-#if 0
-
-
-
-static kmem_cache_t *obdfs_pgrq_cachep = NULL;
-
-int obdfs_init_pgrqcache(void)
-{
- ENTRY;
- if (obdfs_pgrq_cachep == NULL) {
- CDEBUG(D_CACHE, "allocating obdfs_pgrq_cache\n");
- obdfs_pgrq_cachep = kmem_cache_create("obdfs_pgrq",
- sizeof(struct obdfs_pgrq),
- 0, SLAB_HWCACHE_ALIGN,
- NULL, NULL);
- if (obdfs_pgrq_cachep == NULL) {
- EXIT;
- return -ENOMEM;
- } else {
- CDEBUG(D_CACHE, "allocated cache at %p\n",
- obdfs_pgrq_cachep);
- }
- } else {
- CDEBUG(D_CACHE, "using existing cache at %p\n",
- obdfs_pgrq_cachep);
- }
- EXIT;
- return 0;
-} /* obdfs_init_wreqcache */
-
-inline void obdfs_pgrq_del(struct obdfs_pgrq *pgrq)
-{
- --obdfs_cache_count;
- CDEBUG(D_INFO, "deleting page %p from list [count %ld]\n",
- pgrq->rq_page, obdfs_cache_count);
- list_del(&pgrq->rq_plist);
- OBDClearCachePage(pgrq->rq_page);
- kmem_cache_free(obdfs_pgrq_cachep, pgrq);
-}
-
-void obdfs_cleanup_pgrqcache(void)
-{
- ENTRY;
- if (obdfs_pgrq_cachep != NULL) {
- CDEBUG(D_CACHE, "destroying obdfs_pgrqcache at %p, count %ld\n",
- obdfs_pgrq_cachep, obdfs_cache_count);
- if (kmem_cache_destroy(obdfs_pgrq_cachep))
- CERROR("unable to free all of cache\n");
- obdfs_pgrq_cachep = NULL;
- } else
- CERROR("called with NULL pointer\n");
-
- EXIT;
-} /* obdfs_cleanup_wreqcache */
-
-
-/* called with the list lock held */
-static struct page *obdfs_find_page_index(struct inode *inode,
- unsigned long index)
-{
- struct list_head *page_list = obdfs_iplist(inode);
- struct list_head *tmp;
- struct page *page;
-
- ENTRY;
-
- CDEBUG(D_INFO, "looking for inode %ld pageindex %ld\n",
- inode->i_ino, index);
- OIDEBUG(inode);
-
- if (list_empty(page_list)) {
- EXIT;
- return NULL;
- }
- tmp = page_list;
- while ( (tmp = tmp->next) != page_list ) {
- struct obdfs_pgrq *pgrq;
-
- pgrq = list_entry(tmp, struct obdfs_pgrq, rq_plist);
- page = pgrq->rq_page;
- if (index == page->index) {
- CDEBUG(D_INFO,
- "INDEX SEARCH found page %p, index %ld\n",
- page, index);
- EXIT;
- return page;
- }
- }
-
- EXIT;
- return NULL;
-} /* obdfs_find_page_index */
-
-
-/* call and free pages from Linux page cache: called with io lock on inodes */
-int obdfs_do_vec_wr(struct inode **inodes, obd_count num_io,
- obd_count num_obdos, struct obdo **obdos,
- obd_count *oa_bufs, struct page **pages, char **bufs,
- obd_size *counts, obd_off *offsets, obd_flag *flags)
-{
- int err;
-
- ENTRY;
- CDEBUG(D_INFO, "writing %d page(s), %d obdo(s) in vector\n",
- num_io, num_obdos);
- if (obd_debug_level & D_INFO) { /* DEBUGGING */
- int i;
- printk("OBDOS: ");
- for (i = 0; i < num_obdos; i++)
- printk("%ld:0x%p ", (long)obdos[i]->o_id, obdos[i]);
-
- printk("\nPAGES: ");
- for (i = 0; i < num_io; i++)
- printk("0x%p ", pages[i]);
- printk("\n");
- }
-
- err = obd_brw(OBD_BRW_WRITE, IID(inodes[0]), num_obdos, obdos,
- oa_bufs, pages, counts, offsets, flags);
-
- CDEBUG(D_INFO, "BRW done\n");
- /* release the pages from the page cache */
- while (num_io-- > 0) {
- CDEBUG(D_INFO, "calling put_page for %p, index %ld\n",
- pages[num_io], pages[num_io]->index);
- put_page(pages[num_io]);
- }
- CDEBUG(D_INFO, "put_page done\n");
-
- while (num_obdos-- > 0) {
- CDEBUG(D_INFO, "free obdo %ld\n",(long)obdos[num_obdos]->o_id);
- /* copy o_blocks to i_blocks */
- obdfs_set_size (inodes[num_obdos], obdos[num_obdos]->o_size);
- //obdfs_to_inode(inodes[num_obdos], obdos[num_obdos]);
- obdo_free(obdos[num_obdos]);
- }
- CDEBUG(D_INFO, "obdo_free done\n");
- EXIT;
- return err;
-}
-
-
-/*
- * Add a page to the write request cache list for later writing.
- * ASYNCHRONOUS write method.
- */
-static int obdfs_add_page_to_cache(struct inode *inode, struct page *page)
-{
- int err = 0;
- ENTRY;
-
- /* The PG_obdcache bit is cleared by obdfs_pgrq_del() BEFORE the page
- * is written, so at worst we will write the page out twice.
- *
- * If the page has the PG_obdcache bit set, then the inode MUST be
- * on the superblock dirty list so we don't need to check this.
- * Dirty inodes are removed from the superblock list ONLY when they
- * don't have any more cached pages. It is possible to have an inode
- * with no dirty pages on the superblock list, but not possible to
- * have an inode with dirty pages NOT on the superblock dirty list.
- */
- if (!OBDAddCachePage(page)) {
- struct obdfs_pgrq *pgrq;
- pgrq = kmem_cache_alloc(obdfs_pgrq_cachep, SLAB_KERNEL);
- if (!pgrq) {
- OBDClearCachePage(page);
- EXIT;
- return -ENOMEM;
- }
- /* not really necessary since we set all pgrq fields here
- memset(pgrq, 0, sizeof(*pgrq));
- */
-
- pgrq->rq_page = page;
- pgrq->rq_jiffies = jiffies;
- get_page(pgrq->rq_page);
-
- obd_down(&obdfs_i2sbi(inode)->osi_list_mutex);
- list_add(&pgrq->rq_plist, obdfs_iplist(inode));
- obdfs_cache_count++;
- //CERROR("-- count %d\n", obdfs_cache_count);
-
- /* If inode isn't already on superblock inodes list, add it.
- *
- * We increment the reference count on the inode to keep it
- * from being freed from memory. This _should_ be an iget()
- * with an iput() in both flush_reqs() and put_inode(), but
- * since put_inode() is called from iput() we can't call iput()
- * again there. Instead we just increment/decrement i_count,
- * which is mostly what iget/iput do for an inode in memory.
- */
- if ( list_empty(obdfs_islist(inode)) ) {
- atomic_inc(&inode->i_count);
- CDEBUG(D_INFO,
- "adding inode %ld to superblock list %p\n",
- inode->i_ino, obdfs_slist(inode));
- list_add(obdfs_islist(inode), obdfs_slist(inode));
- }
- obd_up(&obdfs_i2sbi(inode)->osi_list_mutex);
-
- }
-
- /* XXX For testing purposes, we can write out the page here.
- err = obdfs_flush_reqs(obdfs_slist(inode), ~0UL);
- */
-
- EXIT;
- return err;
-} /* obdfs_add_page_to_cache */
-
-void rebalance(void)
-{
- if (obdfs_cache_count > 60000) {
- CERROR("-- count %ld\n", obdfs_cache_count);
- //obdfs_flush_dirty_pages(~0UL);
- CERROR("-- count %ld\n", obdfs_cache_count);
- }
-}
-
-
-
-/* select between SYNC and ASYNC I/O methods */
-int obdfs_do_writepage(struct page *page, int sync)
-{
- struct inode *inode = page->mapping->host;
- int err;
-
- ENTRY;
- if ( sync )
- err = obdfs_brw(OBD_BRW_WRITE, inode, page, 1);
- else {
- err = obdfs_add_page_to_cache(inode, page);
- CDEBUG(D_INFO, "DO_WR ino: %ld, page %p, err %d, uptodate %d\n",
- inode->i_ino, page, err, Page_Uptodate(page));
- }
-
- if ( !err ) {
- SetPageUptodate(page);
- set_page_clean(page);
- }
- EXIT;
- return err;
-} /* obdfs_do_writepage */
-
-
-
-
-#endif
-
-int obdfs_commit_write(struct file *file, struct page *page, unsigned from, unsigned to)
-{
- struct inode *inode = page->mapping->host;
- int rc = 0;
- loff_t len = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
- ENTRY;
- CDEBUG(D_INODE, "commit write ino %ld (end at %Ld) from %d to %d ,ind %ld\n",
- inode->i_ino, len, from, to, page->index);
-
-
- if (cache_writes == 0) {
- rc = obdfs_commit_page(page, 1, from, to);
- }
-
- if (len > inode->i_size) {
- obdfs_set_size(inode, len);
- }
-
- kunmap(page);
- EXIT;
- return rc;
-}
-
-
-/*
- * This does the "real" work of the write. The generic routine has
- * allocated the page, locked it, done all the page alignment stuff
- * calculations etc. Now we should just copy the data from user
- * space and write it back to the real medium..
- *
- * If the writer ends up delaying the write, the writer needs to
- * increment the page use counts until he is done with the page.
- *
- * Return value is the number of bytes written.
- */
-int obdfs_write_one_page(struct file *file, struct page *page,
- unsigned long offset, unsigned long bytes,
- const char * buf)
-{
- struct inode *inode = file->f_dentry->d_inode;
- int err;
-
- ENTRY;
- /* We check for complete page writes here, as we then don't have to
- * get the page before writing over everything anyways.
- */
- if (!Page_Uptodate(page) && (offset != 0 || bytes != PAGE_SIZE)) {
- err = obdfs_brw(OBD_BRW_READ, inode, page, 0);
- if ( err )
- return err;
- SetPageUptodate(page);
- }
-
- if (copy_from_user((u8*)page_address(page) + offset, buf, bytes))
- return -EFAULT;
-
- lock_kernel();
- err = obdfs_writepage(page);
- unlock_kernel();
-
- return (err < 0 ? err : bytes);
-} /* obdfs_write_one_page */
-
-/*
- * return an up to date page:
- * - if locked is true then is returned locked
- * - if create is true the corresponding disk blocks are created
- * - page is held, i.e. caller must release the page
- *
- * modeled on NFS code.
- */
-struct page *obdfs_getpage(struct inode *inode, unsigned long offset,
- int create, int locked)
-{
- struct page * page;
- int index;
- int err;
-
- ENTRY;
-
- offset = offset & PAGE_CACHE_MASK;
- CDEBUG(D_INFO, "ino: %ld, offset %ld, create %d, locked %d\n",
- inode->i_ino, offset, create, locked);
- index = offset >> PAGE_CACHE_SHIFT;
-
- page = grab_cache_page(&inode->i_data, index);
-
- /* Yuck, no page */
- if (! page) {
- CERROR("grab_cache_page says no dice ...\n");
- EXIT;
- return NULL;
- }
-
- /* now check if the data in the page is up to date */
- if ( Page_Uptodate(page)) {
- if (!locked) {
- if (PageLocked(page))
- UnlockPage(page);
- } else {
- CERROR("expecting locked page\n");
- }
- EXIT;
- return page;
- }
-
- err = obdfs_brw(OBD_BRW_READ, inode, page, create);
-
- if ( err ) {
- SetPageError(page);
- UnlockPage(page);
- EXIT;
- return page;
- }
-
- if ( !locked )
- UnlockPage(page);
- SetPageUptodate(page);
- EXIT;
- return page;
-} /* obdfs_getpage */
-
-
-void obdfs_truncate(struct inode *inode)
-{
- struct obdo *oa;
- int err;
- ENTRY;
-
- //obdfs_dequeue_pages(inode);
- oa = obdo_alloc();
- if ( !oa ) {
- err = -ENOMEM;
- CERROR("obdo_alloc failed!\n");
- } else {
- oa->o_valid = OBD_MD_FLNOTOBD;
- obdfs_from_inode(oa, inode);
-
- CDEBUG(D_INFO, "calling punch for %ld (%Lu bytes at 0)\n",
- (long)oa->o_id, (unsigned long long)oa->o_size);
- err = obd_punch(IID(inode), oa, oa->o_size, 0);
-
- obdo_free(oa);
- }
-
- if (err) {
- CERROR("obd_truncate fails (%d)\n", err);
- EXIT;
- return;
- }
- EXIT;
-} /* obdfs_truncate */
-
-struct address_space_operations obdfs_aops = {
- readpage: obdfs_readpage,
- writepage: obdfs_writepage,
- sync_page: block_sync_page,
- prepare_write: obdfs_prepare_write,
- commit_write: obdfs_commit_write,
- bmap: NULL
-};
git://git.whamcloud.com / fs / lustre-release.git / blobdiff