Whamcloud - gitweb
- ext2_obd.c --- fix the bugs in read/write for Linux 2.4.3
[fs/lustre-release.git] / lustre / obdclass / genops.c
index a756910..a261dd8 100644 (file)
@@ -1,31 +1,20 @@
 /*
  *  linux/fs/ext2_obd/sim_obd.c
+ * Copyright (C) 2001  Cluster File Systems, Inc.
+ *
+ * This code is issued under the GNU General Public License.
+ * See the file COPYING in this distribution
  *
  * These are the only exported functions; they provide the simulated object-
  * oriented disk.
  *
  */
 
-#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 <asm/system.h>
-#include <asm/uaccess.h>
 
+#include <linux/mm.h>
 #include <linux/fs.h>
-#include <linux/stat.h>
+#include <linux/sched.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>
 
 #include <linux/obd_support.h>
 #include <linux/obd_class.h>
@@ -36,98 +25,106 @@ kmem_cache_t *obdo_cachep = NULL;
 
 int obd_init_obdo_cache(void)
 {
-       ENTRY;
-       if (obdo_cachep != NULL) {
-               printk(KERN_INFO "obdo_cache already exists\n");
-               EXIT;
-               /* XXX maybe this shoul be an error return? */
-               return 0;
-       }
-
-       obdo_cachep = kmem_cache_create("obdo_cache", sizeof(struct obdo),
-                                       0, SLAB_HWCACHE_ALIGN, NULL, NULL);
-       if (obdo_cachep == NULL) {
-               EXIT;
-               return -ENOMEM;
-       }
-       EXIT;
-       return 0;
+        ENTRY;
+        if (obdo_cachep == NULL) {
+                CDEBUG(D_CACHE, "allocating obdo_cache\n");
+                obdo_cachep = kmem_cache_create("obdo_cache",
+                                                sizeof(struct obdo),
+                                                0, SLAB_HWCACHE_ALIGN,
+                                                NULL, NULL);
+                if (obdo_cachep == NULL) {
+                        EXIT;
+                        return -ENOMEM;
+                } else {
+                        CDEBUG(D_CACHE, "allocated cache at %p\n", obdo_cachep);
+                }
+        } else {
+                CDEBUG(D_CACHE, "using existing cache at %p\n", obdo_cachep);
+        }
+        EXIT;
+        return 0;
 }
 
 void obd_cleanup_obdo_cache(void)
 {
-       ENTRY;
-       if (obdo_cachep != NULL)
-               kmem_cache_destroy(obdo_cachep);
-
-       obdo_cachep = NULL;
-       EXIT;
+        ENTRY;
+        if (obdo_cachep != NULL) {
+                CDEBUG(D_CACHE, "destroying obdo_cache at %p\n", obdo_cachep);
+                if (kmem_cache_destroy(obdo_cachep))
+                        printk(KERN_WARNING __FUNCTION__
+                               ": unable to free cache\n");
+        } else
+                printk(KERN_INFO __FUNCTION__
+                       ": called with NULL cache pointer\n");
+
+        obdo_cachep = NULL;
+        EXIT;
 }
 
 
 /* map connection to client */
-struct obd_client *gen_client(struct obd_conn *conn)
+struct obd_client *gen_client(const struct obd_conn *conn)
 {
-       struct obd_device * obddev = conn->oc_dev;
-       struct list_head * lh, * next;
-       struct obd_client * cli;
-
-       lh = next = &obddev->obd_gen_clients;
-       while ((lh = lh->next) != &obddev->obd_gen_clients) {
-               cli = list_entry(lh, struct obd_client, cli_chain);
-               
-               if (cli->cli_id == conn->oc_id)
-                       return cli;
-       }
-
-       return NULL;
+        struct obd_device * obddev = conn->oc_dev;
+        struct list_head * lh, * next;
+        struct obd_client * cli;
+
+        lh = next = &obddev->obd_gen_clients;
+        while ((lh = lh->next) != &obddev->obd_gen_clients) {
+                cli = list_entry(lh, struct obd_client, cli_chain);
+                
+                if (cli->cli_id == conn->oc_id)
+                        return cli;
+        }
+
+        return NULL;
 } /* obd_client */
 
 
 /* a connection defines a context in which preallocation can be managed. */ 
 int gen_connect (struct obd_conn *conn)
 {
-       struct obd_client * cli;
-
-       OBD_ALLOC(cli, struct obd_client *, sizeof(struct obd_client));
-       if ( !cli ) {
-               printk("obd_connect (minor %d): no memory!\n", 
-                      conn->oc_dev->obd_minor);
-               return -ENOMEM;
-       }
-
-       INIT_LIST_HEAD(&cli->cli_prealloc_inodes);
-       /* XXX this should probably spinlocked? */
-       cli->cli_id = ++conn->oc_dev->obd_gen_last_id;
-       cli->cli_prealloc_quota = 0;
-       cli->cli_obd = conn->oc_dev;
-       list_add(&(cli->cli_chain), conn->oc_dev->obd_gen_clients.prev);
-
-       CDEBUG(D_IOCTL, "connect: new ID %u\n", cli->cli_id);
-       conn->oc_id = cli->cli_id;
-       return 0;
+        struct obd_client * cli;
+
+        OBD_ALLOC(cli, struct obd_client *, sizeof(struct obd_client));
+        if ( !cli ) {
+                printk(__FUNCTION__ ": no memory! (minor %d)\n", 
+                       conn->oc_dev->obd_minor);
+                return -ENOMEM;
+        }
+
+        INIT_LIST_HEAD(&cli->cli_prealloc_inodes);
+        /* XXX this should probably spinlocked? */
+        cli->cli_id = ++conn->oc_dev->obd_gen_last_id;
+        cli->cli_prealloc_quota = 0;
+        cli->cli_obd = conn->oc_dev;
+        list_add(&(cli->cli_chain), conn->oc_dev->obd_gen_clients.prev);
+
+        CDEBUG(D_INFO, "connect: new ID %u\n", cli->cli_id);
+        conn->oc_id = cli->cli_id;
+        return 0;
 } /* gen_obd_connect */
 
 
 int gen_disconnect(struct obd_conn *conn)
 {
-       struct obd_client * cli;
-       ENTRY;
+        struct obd_client * cli;
+        ENTRY;
 
-       if (!(cli = gen_client(conn))) {
-               CDEBUG(D_IOCTL, "disconnect: attempting to free "
-                      "nonexistent client %u\n", conn->oc_id);
-               return -EINVAL;
-       }
+        if (!(cli = gen_client(conn))) {
+                CDEBUG(D_IOCTL, "disconnect: attempting to free "
+                       "nonexistent client %u\n", conn->oc_id);
+                return -EINVAL;
+        }
 
 
-       list_del(&(cli->cli_chain));
-       OBD_FREE(cli, sizeof(struct obd_client));
+        list_del(&(cli->cli_chain));
+        OBD_FREE(cli, sizeof(struct obd_client));
 
-       CDEBUG(D_IOCTL, "disconnect: ID %u\n", conn->oc_id);
+        CDEBUG(D_INFO, "disconnect: ID %u\n", conn->oc_id);
 
-       EXIT;
-       return 0;
+        EXIT;
+        return 0;
 } /* gen_obd_disconnect */
 
 
@@ -138,38 +135,43 @@ int gen_disconnect(struct obd_conn *conn)
  */ 
 int gen_multi_setup(struct obd_device *obddev, uint32_t len, void *data)
 {
-       int i;
-
-       for (i = 0 ; i < obddev->obd_multi_count ; i++ ) {
-               int rc;
-               struct obd_conn *ch_conn = &obddev->obd_multi_conn[i];
-               rc  = OBP(ch_conn->oc_dev, connect)(ch_conn);
-
-               if ( rc != 0 ) {
-                       /* XXX disconnect others */
-                       return -EINVAL;
-               }
-       }               
-       return 0;
+        int i;
+
+        for (i = 0 ; i < obddev->obd_multi_count ; i++ ) {
+                int rc;
+                struct obd_conn *ch_conn = &obddev->obd_multi_conn[i];
+                rc  = OBP(ch_conn->oc_dev, connect)(ch_conn);
+
+                if ( rc != 0 ) {
+                        int j;
+
+                        for (j = --i; j >= 0; --j) {
+                                ch_conn = &obddev->obd_multi_conn[i];
+                                OBP(ch_conn->oc_dev, disconnect)(ch_conn);
+                        }
+                        return -EINVAL;
+                }
+        }               
+        return 0;
 }
 
 
 #if 0
 int gen_multi_attach(struct obd_device *obddev, int len, void *data)
 {
-       int i;
-       int count;
-       struct obd_device *rdev = obddev->obd_multi_dev[0];
-
-       count = len/sizeof(int);
-       obddev->obd_multi_count = count;
-       for (i=0 ; i<count ; i++) {
-               rdev = &obd_dev[*((int *)data + i)];
-               rdev = rdev + 1;
-               CDEBUG(D_IOCTL, "OBD RAID1: replicator %d is of type %s\n", i,
-                      (rdev + i)->obd_type->typ_name);
-       }
-       return 0;
+        int i;
+        int count;
+        struct obd_device *rdev = obddev->obd_multi_dev[0];
+
+        count = len/sizeof(int);
+        obddev->obd_multi_count = count;
+        for (i=0 ; i<count ; i++) {
+                rdev = &obd_dev[*((int *)data + i)];
+                rdev = rdev + 1;
+                CDEBUG(D_INFO, "OBD RAID1: replicator %d is of type %s\n", i,
+                       (rdev + i)->obd_type->typ_name);
+        }
+        return 0;
 }
 #endif
 
@@ -181,18 +183,20 @@ int gen_multi_attach(struct obd_device *obddev, int len, void *data)
  */
 int gen_multi_cleanup(struct obd_device *obddev)
 {
-       int i;
-
-       for (i = 0 ; i < obddev->obd_multi_count ; i++ ) {
-               struct obd_conn *ch_conn = &obddev->obd_multi_conn[i];
-               int rc;
-               rc  = OBP(ch_conn->oc_dev, disconnect)(ch_conn);
-
-               if ( rc != 0 ) {
-                       printk("OBD multi cleanup dev: disconnect failure %d\n", ch_conn->oc_dev->obd_minor);
-               }
-       }               
-       return 0;
+        int i;
+
+        for (i = 0 ; i < obddev->obd_multi_count ; i++ ) {
+                struct obd_conn *ch_conn = &obddev->obd_multi_conn[i];
+                int rc;
+                rc  = OBP(ch_conn->oc_dev, disconnect)(ch_conn);
+
+                if ( rc != 0 ) {
+                        printk(KERN_WARNING __FUNCTION__
+                               ": disconnect failure %d\n",
+                               ch_conn->oc_dev->obd_minor);
+                }
+        }               
+        return 0;
 } /* gen_multi_cleanup_device */
 
 
@@ -203,18 +207,18 @@ int gen_multi_cleanup(struct obd_device *obddev)
  */
 int gen_cleanup(struct obd_device * obddev)
 {
-       struct list_head * lh, * tmp;
-       struct obd_client * cli;
-
-       ENTRY;
-
-       lh = tmp = &obddev->obd_gen_clients;
-       while ((tmp = tmp->next) != lh) {
-               cli = list_entry(tmp, struct obd_client, cli_chain);
-               CDEBUG(D_IOCTL, "Disconnecting obd_connection %d, at %p\n",
-                      cli->cli_id, cli);
-       }
-       return 0;
+        struct list_head * lh, * tmp;
+        struct obd_client * cli;
+
+        ENTRY;
+
+        lh = tmp = &obddev->obd_gen_clients;
+        while ((tmp = tmp->next) != lh) {
+                cli = list_entry(tmp, struct obd_client, cli_chain);
+                CDEBUG(D_INFO, "Disconnecting obd_connection %d, at %p\n",
+                       cli->cli_id, cli);
+        }
+        return 0;
 } /* sim_cleanup_device */
 
 void ___wait_on_page(struct page *page)
@@ -240,53 +244,70 @@ void lck_page(struct page *page)
                 ___wait_on_page(page);
 }
 
-/* XXX this should return errors correctly, so should migrate!!! */
 int gen_copy_data(struct obd_conn *dst_conn, struct obdo *dst,
-                 struct obd_conn *src_conn, struct obdo *src,
-                 obd_size count, obd_off offset)
+                  struct obd_conn *src_conn, struct obdo *src,
+                  obd_size count, obd_off offset)
 {
-       struct page *page;
-       unsigned long index = 0;
-       int rc;
-       ENTRY;
-
-       CDEBUG(D_INODE, "src: ino %Ld blocks %Ld, size %Ld, dst: ino %Ld\n", 
-              src->o_id, src->o_blocks, src->o_size, dst->o_id);
-       page = alloc_page(GFP_USER);
-       if ( !page ) {
-               EXIT;
-               return -ENOMEM;
-       }
-       
-       lck_page(page);
-       
-       while (index < ((src->o_size + PAGE_SIZE - 1) >> PAGE_SHIFT)) {
-               
-               page->index = index;
-               rc = OBP(src_conn->oc_dev, brw)
-                       (READ, src_conn, src, (char *)page_address(page), 
-                        PAGE_SIZE, (page->index) << PAGE_SHIFT, 0);
-
-               if ( rc != PAGE_SIZE ) 
-                       break;
-               CDEBUG(D_INODE, "Read page %ld ...\n", page->index);
-
-               rc = OBP(dst_conn->oc_dev, brw)
-                       (WRITE, dst_conn, dst,  (char *)page_address(page), 
-                        PAGE_SIZE, (page->index) << PAGE_SHIFT, 1);
-               if ( rc != PAGE_SIZE)
-                       break;
-
-               CDEBUG(D_INODE, "Wrote page %ld ...\n", page->index);
-               
-               index ++;
-       }
-       dst->o_size = src->o_size;
-       dst->o_blocks = src->o_blocks;
-       dst->o_valid |= (OBD_MD_FLSIZE | OBD_MD_FLBLOCKS);
-       UnlockPage(page);
-       __free_page(page);
-
-       EXIT;
-       return 0;
+        struct page *page;
+        unsigned long index = 0;
+        int err = 0;
+
+        ENTRY;
+        CDEBUG(D_INFO, "src: ino %Ld blocks %Ld, size %Ld, dst: ino %Ld\n", 
+               src->o_id, src->o_blocks, src->o_size, dst->o_id);
+        page = alloc_page(GFP_USER);
+        if ( !page ) {
+                EXIT;
+                return -ENOMEM;
+        }
+        
+        lck_page(page);
+        
+        /* XXX with brw vector I/O, we could batch up reads and writes here,
+         *     all we need to do is allocate multiple pages to handle the I/Os
+         *     and arrays to handle the request parameters.
+         */
+        while (index < ((src->o_size + PAGE_SIZE - 1) >> PAGE_SHIFT)) {
+                obd_count        num_oa = 1;
+                obd_count        num_buf = 1;
+                char            *buf;
+                obd_size         brw_count = PAGE_SIZE;
+                obd_off          brw_offset = (page->index) << PAGE_SHIFT;
+                obd_flag         flagr = 0;
+                obd_flag         flagw = OBD_BRW_CREATE;
+                
+                page->index = index;
+                buf = (char *)page_address(page); 
+                err = OBP(src_conn->oc_dev, brw)(READ, src_conn, num_oa, &src,
+                                                 &num_buf, &buf, &brw_count,
+                                                 &brw_offset, &flagr);
+
+                if ( err ) {
+                        EXIT;
+                        break;
+                }
+                CDEBUG(D_INFO, "Read page %ld ...\n", page->index);
+
+                err = OBP(dst_conn->oc_dev, brw)(WRITE, dst_conn, num_oa, &dst,
+                                                 &num_buf, &buf, &brw_count,
+                                                 &brw_offset, &flagw);
+
+                /* XXX should handle dst->o_size, dst->o_blocks here */
+                if ( err ) {
+                        EXIT;
+                        break;
+                }
+
+                CDEBUG(D_INFO, "Wrote page %ld ...\n", page->index);
+                
+                index++;
+        }
+        dst->o_size = src->o_size;
+        dst->o_blocks = src->o_blocks;
+        dst->o_valid |= (OBD_MD_FLSIZE | OBD_MD_FLBLOCKS);
+        obd_unlock_page(page);
+        __free_page(page);
+
+        EXIT;
+        return err;
 }