+++ /dev/null
-/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
- * vim:expandtab:shiftwidth=8:tabstop=8:
- *
- * Copyright (C) 2004 Cluster File Systems, Inc.
- *
- * This file is part of Lustre, http://www.lustre.org.
- *
- * Lustre is free software; you can redistribute it and/or
- * modify it under the terms of version 2 of the GNU General Public
- * License as published by the Free Software Foundation.
- *
- * Lustre is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Lustre; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- *
- */
-
-#define DEBUG_SUBSYSTEM S_SM
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/pagemap.h>
-#include <linux/string.h>
-#include <linux/slab.h>
-#include <linux/stat.h>
-#include <linux/unistd.h>
-#include <linux/smp_lock.h>
-#include <linux/obd_class.h>
-#include <linux/obd_support.h>
-#include <linux/lustre_lib.h>
-#include <linux/lustre_idl.h>
-#include <linux/lustre_fsfilt.h>
-
-#include <linux/lustre_smfs.h>
-#include <linux/lustre_snap.h>
-
-#include "smfs_internal.h"
-
-#define SNAPTABLE_SIZE(size) (sizeof(struct snap_table) + \
- size * sizeof(struct snap))
-
-int smfs_cleanup_snap_info(struct snap_info *snap_info);
-
-static int smfs_init_snap_super_info(struct smfs_super_info *smfs_info)
-{
- struct snap_super_info *snap_sinfo;
- int rc = 0;
-
- ENTRY;
-
- OBD_ALLOC(smfs_info->smsi_snap_info,
- sizeof(struct snap_super_info));
-
- if (!smfs_info->smsi_snap_info)
- GOTO(exit, rc = -ENOMEM);
-
- snap_sinfo = smfs_info->smsi_snap_info;
-
- /*init snap fsfilt operations*/
- if (!snap_sinfo->snap_cache_fsfilt) {
- char *snap_cache_ftype = NULL;
- int tmp = strlen(smfs_info->smsi_cache_ftype) + strlen("_snap");
-
- OBD_ALLOC(snap_cache_ftype, tmp + 1);
- if (!snap_cache_ftype)
- GOTO(exit, rc = -ENOMEM);
-
- sprintf(snap_cache_ftype, "%s_snap", smfs_info->smsi_cache_ftype);
- snap_sinfo->snap_cache_fsfilt = fsfilt_get_ops(snap_cache_ftype);
- OBD_FREE(snap_cache_ftype, tmp + 1);
- if (!snap_sinfo->snap_cache_fsfilt) {
- CERROR("Can not get %s fsfilt ops needed by snap\n",
- snap_cache_ftype);
- GOTO(exit, rc = -EINVAL);
- }
- }
- if (!snap_sinfo->snap_fsfilt) {
- char *snap_ftype = NULL;
- int tmp = strlen(smfs_info->smsi_ftype) + strlen("_snap");
-
- OBD_ALLOC(snap_ftype, tmp + 1);
- if (!snap_ftype)
- GOTO(exit, rc = -ENOMEM);
-
- sprintf(snap_ftype, "%s_snap", smfs_info->smsi_ftype);
- snap_sinfo->snap_fsfilt = fsfilt_get_ops(snap_ftype);
- OBD_FREE(snap_ftype, tmp + 1);
- if (!snap_sinfo->snap_fsfilt) {
- CERROR("Can not get %s fsfilt ops needed by snap\n",
- snap_ftype);
- GOTO(exit, rc = -EINVAL);
- }
- }
- INIT_LIST_HEAD(&snap_sinfo->snap_list);
-exit:
- if (rc && smfs_info->smsi_snap_info)
- OBD_FREE(snap_sinfo, sizeof(struct snap_super_info));
- RETURN(rc);
-}
-/*FIXME-wangdi Should remove it when integrated it with lustre*/
-static struct dentry *smfs_simple_mkdir(struct dentry *dir, char *name,
- int mode, int fix)
-{
- struct dentry *dchild;
- int err = 0;
-
- dchild = ll_lookup_one_len(name, dir, strlen(name));
- if (IS_ERR(dchild))
- GOTO(out_up, dchild);
-
- if (dchild->d_inode) {
- int old_mode = dchild->d_inode->i_mode;
- if (!S_ISDIR(old_mode))
- GOTO(out_err, err = -ENOTDIR);
-
- /* Fixup directory permissions if necessary */
- if (fix && (old_mode & S_IALLUGO) != (mode & S_IALLUGO)) {
- CWARN("fixing permissions on %s from %o to %o\n",
- name, old_mode, mode);
- dchild->d_inode->i_mode = (mode & S_IALLUGO) |
- (old_mode & ~S_IALLUGO);
- mark_inode_dirty(dchild->d_inode);
- }
- GOTO(out_up, dchild);
- }
- err = vfs_mkdir(dir->d_inode, dchild, mode);
- if (err)
- GOTO(out_err, err);
- RETURN(dchild);
-out_err:
- dput(dchild);
- dchild = ERR_PTR(err);
-out_up:
- return dchild;
-
-}
-static struct snap_info *smfs_find_snap_info(struct inode *inode)
-{
- struct snap_inode_info *snap_iinfo = I2SNAPI(inode);
- struct snap_super_info *snap_sinfo = S2SNAPI(inode->i_sb);
- struct snap_info *snap_info = NULL, *tmp;
-
- ENTRY;
- list_for_each_entry_safe(snap_info, tmp, &snap_sinfo->snap_list,
- sni_list) {
- if (snap_info->sni_root_ino == snap_iinfo->sn_root_ino)
- RETURN(snap_info);
- }
- RETURN(NULL);
-}
-
-#if 0
-static int smfs_dotsnap_dir_size(struct inode *inode)
-{
- struct snap_super_info *snap_sinfo = S2SNAPI(inode->i_sb);
- struct fsfilt_operations *snapops = snap_sinfo->snap_cache_fsfilt;
- int size = 0, dir_size = 0, blocks, i = 0;
- struct snap_table *snap_table = NULL;
- struct snap_info *snap_info = NULL;
- ENTRY;
-
- snap_info = smfs_find_snap_info(inode);
-
- if (!snap_info) {
- CDEBUG(D_INFO, "can not find snap info for inode %p\n", inode);
- RETURN(0);
- }
- snap_table = snap_info->sni_table;
- for (i = 0; i < snap_table->sntbl_count; i++) {
- char *name = snap_table->sntbl_items[i].sn_name;
- size += snapops->fs_dir_ent_size(name);
- }
- /*FIXME this is only for ext3 dir format, may need fix for other FS*/
- blocks = (size + inode->i_sb->s_blocksize - 1) >>
- inode->i_sb->s_blocksize_bits;
-
- dir_size = blocks * inode->i_sb->s_blocksize;
- RETURN(dir_size);
-
-}
-#endif
-
-static int smfs_init_snap_inode_info(struct inode *inode, struct inode *dir, int index)
-{
- int rc = 0;
- ENTRY;
-
- if (!inode)
- RETURN(0);
-
- if (dir) {
- I2SNAPI(inode)->sn_flags = I2SNAPI(dir)->sn_flags;
- I2SNAPI(inode)->sn_gen = I2SNAPI(dir)->sn_gen;
- I2SNAPI(inode)->sn_root_ino = I2SNAPI(dir)->sn_root_ino;
- I2SNAPI(inode)->sn_index = I2SNAPI(inode)->sn_index;
- } else {
- I2SNAPI(inode)->sn_flags = 0;
- I2SNAPI(inode)->sn_gen = 0;
- }
-
- I2SNAPI(inode)->sn_index = index;
-
- if (smfs_dotsnap_inode(inode)) {
- struct snap_info *snap_info;
-
- snap_info = smfs_find_snap_info(inode);
- if (!snap_info) {
- RETURN(-EIO);
- }
- /*init dot_snap inode info*/
-// inode->i_size = (loff_t)smfs_dotsnap_dir_size(inode);
- inode->i_size = snap_info->sni_table->sntbl_count;
- inode->i_nlink = snap_info->sni_table->sntbl_count + 2;
- inode->i_uid = 0;
- inode->i_gid = 0;
- } else if (SMFS_DO_COW(S2SMI(inode->i_sb)) &&
- (I2SMI(inode)->smi_flags & SM_DO_COW) &&
- smfs_primary_inode(inode)) {
- struct snap_inode_info *sni_info = I2SNAPI(inode);
- struct fsfilt_operations *sops = I2SNAPCOPS(inode);
- int vallen = 0;
-
- vallen = sizeof(sni_info->sn_gen);
-
- rc = sops->fs_get_snap_info(I2CI(inode), SNAP_GENERATION,
- strlen(SNAP_GENERATION),
- &sni_info->sn_gen, &vallen);
- }
- RETURN(rc);
-}
-
-#define COWED_NAME_LEN (7 + 8 + 1)
-static int smfs_init_cowed_dir(struct snap_info *snap_info, struct inode* inode)
-{
- struct dentry *dentry = NULL;
- char name[COWED_NAME_LEN];
- int rc = 0;
- ENTRY;
-
- sprintf(name, ".cowed_%08x", (__u32)inode->i_ino);
- /*FIXME-WANGDI: will use simple_mkdir, when integrating snap to lustre*/
- dentry = smfs_simple_mkdir(inode->i_sb->s_root, name, 0777, 1);
- if (IS_ERR(dentry)) {
- rc = PTR_ERR(dentry);
- CERROR("create cowed directory: rc = %d\n", rc);
- RETURN(rc);
- }
- snap_info->sni_cowed_dentry = dentry;
- /*cleanup cowed inode attr for cowed dir*/
- SMFS_CLEAN_INODE_COWED(dentry->d_inode);
- RETURN(rc);
-}
-
-static int smfs_init_dotinfo(struct snap_info *snap_info)
-{
- struct snap_dot_info *dot_info = NULL;
- int rc = 0;
- ENTRY;
-
- if (snap_info->sni_dot_info)
- RETURN(-EEXIST);
-
- OBD_ALLOC(snap_info->sni_dot_info, sizeof(struct snap_dot_info));
-
- if (!snap_info->sni_dot_info)
- RETURN(-ENOMEM);
-
- dot_info = snap_info->sni_dot_info;
-
- OBD_ALLOC(dot_info->dot_name, strlen(DOT_SNAP_NAME) + 1);
-
- if (!dot_info->dot_name) {
- OBD_FREE(snap_info->sni_dot_info, sizeof(struct snap_dot_info));
- RETURN(-ENOMEM);
- }
- memcpy(dot_info->dot_name, DOT_SNAP_NAME, strlen(DOT_SNAP_NAME));
-
- dot_info->dot_name_len = strlen(DOT_SNAP_NAME);
- dot_info->dot_snap_enable = 1;
-
- RETURN(rc);
-}
-
-static int smfs_init_snap_info(struct smfs_super_info *smb,
- struct snap_info *snap_info, struct inode *inode)
-{
- struct snap_table *snap_table = NULL;
- struct fsfilt_operations *snapcops;
- int rc = 0, size, table_size, vallen, i;
-
- ENTRY;
-
- snapcops = smb->smsi_snap_info->snap_cache_fsfilt;
- /*Initialized table */
- /*get the maxsize of snaptable*/
- vallen = sizeof(int);
- rc = snapcops->fs_get_snap_info(I2CI(inode), MAX_SNAPTABLE_COUNT,
- strlen(MAX_SNAPTABLE_COUNT), &size,
- &vallen);
- if (size == 0) {
- CERROR("the Max snaptable count should not be zero\n");
- GOTO(exit, rc);
- }
- table_size = SNAPTABLE_SIZE(size);
-
- OBD_ALLOC(snap_info->sni_table, table_size);
-
- if (!snap_info->sni_table) {
- CERROR("No MEM\n");
- RETURN(-ENOMEM);
- }
- snap_table = snap_info->sni_table;
-
- snap_table->sntbl_magic = cpu_to_le32((__u32)SNAPTABLE_MAGIC);
- snap_table->sntbl_max_count = size;
- /*init sn_index to -1*/
- for (i = 0; i < snap_table->sntbl_max_count; i++)
- snap_table->sntbl_items[i].sn_index = -1;
- /*get snaptable info*/
- rc = snapcops->fs_get_snap_info(I2CI(inode), SNAPTABLE_INFO,
- strlen(SNAPTABLE_INFO),
- snap_table, &table_size);
- if (rc < 0) {
- if (rc == -ENODATA) {
- snap_table->sntbl_count = 0;
- rc = 0;
- } else {
- CERROR("Can not retrive the snaptable from this filesystem\n");
- GOTO(exit, rc);
- }
- } else {
- if (le32_to_cpu(snap_table->sntbl_magic) != SNAPTABLE_MAGIC) {
- CERROR("On disk snaptable is not right \n");
- GOTO(exit, rc = -EIO);
- }
- }
- init_MUTEX(&snap_info->sni_sema);
- snap_info->sni_root_ino = inode->i_ino;
- rc = smfs_init_cowed_dir(snap_info, inode);
- if (rc) {
- CERROR("Init cowed dir error rc=%d\n", rc);
- GOTO(exit, rc);
- }
- rc = smfs_init_dotinfo(snap_info);
-exit:
- if (rc && snap_table)
- OBD_FREE(snap_table, table_size);
- RETURN(rc);
-}
-
-static struct snap_info *smfs_create_snap_info(struct smfs_super_info *sinfo,
- struct inode *inode)
-{
- struct snap_info *snap_info = NULL;
- int rc = 0;
- ENTRY;
-
- OBD_ALLOC(snap_info, sizeof(struct snap_info));
- if (!snap_info)
- RETURN(ERR_PTR(-ENOMEM));
- rc = smfs_init_snap_info(sinfo, snap_info, inode);
- if (rc)
- GOTO(exit, rc);
-
- /*set cow flags for the snap root inode*/
- I2SMI(inode)->smi_flags |= SM_DO_COW;
- I2SNAPI(inode)->sn_root_ino = inode->i_ino;
-exit:
- if (rc) {
- OBD_FREE(snap_info, sizeof(struct snap_info));
- snap_info = ERR_PTR(rc);
- }
- RETURN(snap_info);
-}
-
-static int smfs_cow_pre(struct inode *dir, void *dentry, void *new_dir,
- void *new_dentry, int op);
-
-static int smfs_cow_post(struct inode *dir, void *dentry, void *new_dir,
- void *new_dentry, int op);
-#define COW_HOOK "cow_hook"
-static int smfs_cow_pre_hook(struct inode *inode, void *dentry, void *data1,
- void *data2, int op, void *handle)
-{
- int rc = 0;
- ENTRY;
-
- if (smfs_do_cow(inode)) {
- /*FIXME:WANGDI, get index from the dentry*/
- #if 0
- int index = 0;
- smfs_get_dentry_name_index(dentry, &name, index);
- smfs_free_dentry_name(&name);
- #endif
- rc = smfs_cow_pre(inode, dentry, data1, data2, op);
- }
- RETURN(rc);
-}
-static int smfs_cow_post_hook(struct inode *inode, void *dentry, void *data1,
- void *data2, int op, void *handle)
-{
- int rc = 0;
- ENTRY;
-
- if (smfs_do_cow(inode)) {
- rc = smfs_cow_post(inode, dentry, data1, data2, op);
- }
- RETURN(rc);
-}
-
-int smfs_cow_cleanup(struct smfs_super_info *smb)
-{
- struct snap_super_info *snap_sinfo = smb->smsi_snap_info;
- struct list_head *snap_list = &snap_sinfo->snap_list;
- struct smfs_hook_ops *cow_hops;
- int rc = 0;
- ENTRY;
-
- while (!list_empty(snap_list)) {
- struct snap_info *snap_info;
-
- snap_info = list_entry(snap_list->next, struct snap_info,
- sni_list);
- rc = smfs_cleanup_snap_info(snap_info);
- if (rc)
- CERROR("cleanup snap_info error rc=%d\n", rc);
- list_del(&snap_info->sni_list);
- OBD_FREE(snap_info, sizeof(struct snap_info));
- }
-
- if (snap_sinfo->snap_fsfilt)
- fsfilt_put_ops(snap_sinfo->snap_fsfilt);
- if (snap_sinfo->snap_cache_fsfilt)
- fsfilt_put_ops(snap_sinfo->snap_cache_fsfilt);
-
- cow_hops = smfs_unregister_hook_ops(smb, COW_HOOK);
- smfs_free_hook_ops(cow_hops);
-
- SMFS_CLEAN_COW(smb);
- if (snap_sinfo)
- OBD_FREE(snap_sinfo, sizeof(struct snap_super_info));
- RETURN(rc);
-}
-
-int smfs_cow_init(struct super_block *sb)
-{
- struct smfs_super_info *smfs_info = S2SMI(sb);
- struct smfs_hook_ops *cow_hops = NULL;
- struct fsfilt_operations *sops;
- struct inode *root_inode = smfs_info->smsi_sb->s_root->d_inode;
- int snap_count = 0, rc = 0, vallen;
-
- ENTRY;
-
- SMFS_SET_COW(smfs_info);
-
- cow_hops = smfs_alloc_hook_ops(COW_HOOK, smfs_cow_pre_hook,
- smfs_cow_post_hook);
- if (!cow_hops) {
- RETURN(-ENOMEM);
- }
-
- rc = smfs_register_hook_ops(smfs_info, cow_hops);
- if (rc) {
- smfs_free_hook_ops(cow_hops);
- RETURN(rc);
- }
-
- rc = smfs_init_snap_super_info(smfs_info);
- if (rc && cow_hops) {
- smfs_unregister_hook_ops(smfs_info, cow_hops->smh_name);
- smfs_free_hook_ops(cow_hops);
- RETURN(rc);
- }
- sops = smfs_info->smsi_snap_info->snap_cache_fsfilt;
-
- vallen = sizeof(int);
- rc = sops->fs_get_snap_info(root_inode, SNAP_COUNT, strlen(SNAP_COUNT),
- &snap_count, &vallen);
- if (rc < 0)
- GOTO(exit, rc);
-
- if (snap_count > 0) {
- int snap_root_size = snap_count * sizeof(ino_t);
- ino_t *snap_root;
- int i;
-
- OBD_ALLOC(snap_root, snap_root_size);
-
- if (!snap_root)
- GOTO(exit, rc = -ENOMEM);
-
- rc = sops->fs_get_snap_info(root_inode, SNAP_ROOT_INO,
- strlen(SNAP_ROOT_INO), snap_root,
- &snap_root_size);
- if (rc < 0) {
- OBD_FREE(snap_root, sizeof(int) * snap_count);
- GOTO(exit, rc);
- }
- for (i = 0; i < snap_count; i++) {
- ino_t root_ino = le32_to_cpu(snap_root[i]);
- struct snap_info *snap_info;
-
- root_inode = smfs_get_inode(sb, root_ino, NULL, 0);
- smfs_init_snap_inode_info(root_inode, NULL, 0);
- snap_info = smfs_create_snap_info(S2SMI(sb), root_inode);
- iput(root_inode);
- if (IS_ERR(snap_info)) {
- OBD_FREE(snap_root, sizeof(int) * snap_count);
- GOTO(exit, rc = PTR_ERR(snap_info));
- }
- list_add(&snap_info->sni_list,
- &(S2SNAPI(sb)->snap_list));
- }
- }
- smfs_info->smsi_snap_info->snap_count = snap_count;
-exit:
- if (rc)
- smfs_cow_cleanup(smfs_info);
- RETURN(rc);
-}
-
-static int smfs_cleanup_dotinfo(struct snap_info *snap_info)
-{
- struct snap_dot_info *dot_info = NULL;
- int rc = 0;
- ENTRY;
-
- if (!snap_info->sni_dot_info)
- RETURN(rc);
-
- dot_info = snap_info->sni_dot_info;
-
- if (dot_info->dot_name) {
- OBD_FREE(dot_info->dot_name, dot_info->dot_name_len + 1);
- }
-
- OBD_FREE(dot_info, sizeof(struct snap_dot_info));
-
- RETURN(rc);
-}
-
-int smfs_cleanup_snap_info(struct snap_info *snap_info)
-{
- struct snap_table *snap_table = snap_info->sni_table;
- int rc = 0, table_size;
- ENTRY;
-
- l_dput(snap_info->sni_cowed_dentry);
- //d_unalloc(snap_info->sni_cowed_dentry);
- if (snap_table) {
- table_size = SNAPTABLE_SIZE(snap_table->sntbl_max_count);
- OBD_FREE(snap_info->sni_table, table_size);
- }
- smfs_cleanup_dotinfo(snap_info);
- RETURN(rc);
-}
-
-int smfs_snap_test_inode(struct inode *inode, void *args)
-{
- struct smfs_iget_args *sargs = (struct smfs_iget_args*)args;
- struct inode *dir;
-
- LASSERT(sargs);
-
- dir = sargs->s_inode;
-
- if (sargs->s_index > 0) {
- if (I2SNAPI(inode)->sn_index != sargs->s_index)
- return 0;
- }else {
- if (dir && I2SNAPI(inode)->sn_index != I2SNAPI(dir)->sn_index)
- return 0;
- }
- return 1;
-}
-/* latest snap: returns
- - the index of the latest snapshot before NOW
- - hence it returns 0 in case all the volume snapshots lie in the future
- - this is the index where a COW will land (will be created)
-*/
-void snap_last(struct inode *inode, struct snap *snap)
-{
- time_t now = LTIME_S(CURRENT_TIME);
- struct snap_table *snap_table;
- struct snap_info *snap_info;
- int i ;
-
- ENTRY;
-
- snap_info = smfs_find_snap_info(inode);
- if (!snap_info) {
- CDEBUG(D_INFO, "can not find snap info for inode %p\n", inode);
- EXIT;
- return;
- }
- snap_table = snap_info->sni_table;
- /* start at the highest index in the superblock snaptime array */
- if (snap_table->sntbl_count == 0) {
- memset(snap, 0, sizeof(struct snap));
- } else {
- i = snap_table->sntbl_count - 1;
- snap->sn_index = snap_table->sntbl_items[i].sn_index;
- snap->sn_time = snap_table->sntbl_items[i].sn_time;
- snap->sn_gen = snap_table->sntbl_items[i].sn_gen;
- }
- CDEBUG(D_INFO, "index: %d, time[i]: %ld, now: %ld\n",
- snap->sn_index, snap->sn_time, now);
- EXIT;
- return;
-}
-
-static inline int get_index_of_item(struct snap_table *table, char *name)
-{
- int count = table->sntbl_count;
- int i, j;
- ENTRY;
-
- for (i = 0; i < table->sntbl_max_count; i++) {
- if (!strcmp(name, table->sntbl_items[i].sn_name)) {
- CERROR("Duplicate name %s in snaptable\n", name);
- RETURN(-EINVAL);
- }
- }
-
- for (i = 1; i <= table->sntbl_max_count; i++) {
- int found = 0;
- for (j = 0; j < (count + 1); j++) {
- if (table->sntbl_items[j].sn_index == i) {
- found = 1;
- break;
- }
- }
- if (!found)
- RETURN(i);
- }
- CERROR("snaptable Full\n");
- RETURN(-ENOSPC);
-}
-
-static struct dentry *smfs_find_snap_root(struct super_block *sb,
- char *path_name)
-{
- struct dentry *dentry = NULL;
- struct nameidata nd;
- ENTRY;
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
- if (path_init(path_name, LOOKUP_FOLLOW, &nd)) {
- int error = path_walk(path_name, &nd);
- if (error) {
- path_release(&nd);
- RETURN(NULL);
- }
- } else {
- RETURN(NULL);
- }
-#else
- if (path_lookup(path_name, LOOKUP_FOLLOW, &nd))
- RETURN(NULL);
-#endif
- dentry = dget(nd.dentry);
- path_release(&nd);
- RETURN(dentry);
-}
-
-static int snap_add_item(struct smfs_super_info *smb,
- struct snap_info *snap_info,
- char *name)
-{
- struct fsfilt_operations *snapops;
- struct snap_table *snap_table = snap_info->sni_table;
- struct inode *root_inode = NULL;
- int table_size, count = 0, index = 0, rc = 0;
- struct snap *snap_item;
- ENTRY;
-
- count = snap_table->sntbl_count;
- root_inode = iget(smb->smsi_sb, snap_info->sni_root_ino);
- if (!root_inode || is_bad_inode(root_inode))
- RETURN(-EIO);
- /* XXX Is down this sema necessary*/
- down_interruptible(&snap_info->sni_sema);
- snap_item = &snap_table->sntbl_items[count];
- snapops = smb->smsi_snap_info->snap_cache_fsfilt;
- /*add item in snap_table set generation*/
- snap_item->sn_time = LTIME_S(CURRENT_TIME);
- /* find table index */
- index = get_index_of_item(snap_table, name);
- if (index < 0)
- GOTO(exit, rc = index);
-
- snap_item->sn_index = index;
- snap_item->sn_flags = 0;
- snap_item->sn_gen = snap_table->sntbl_generation + 1;
- memcpy(snap_item->sn_name, name, SNAP_MAX_NAMELEN);
- /* Wrote the whole snap_table to disk */
- table_size = SNAPTABLE_SIZE(snap_table->sntbl_max_count);
-
- snap_table->sntbl_count++;
- snap_table->sntbl_generation++;
- rc = snapops->fs_set_snap_info(root_inode, SNAPTABLE_INFO,
- strlen(SNAPTABLE_INFO),
- snap_table, &table_size);
- if (rc) {
- snap_table->sntbl_count--;
- snap_table->sntbl_generation--;
- CERROR("Set snaptable error rc=%d\n", rc);
- GOTO(exit, rc);
- }
-exit:
- up(&snap_info->sni_sema);
- if (root_inode)
- iput(root_inode);
- RETURN(rc);
-}
-
-static struct snap_info * smfs_find_create_snap_info(struct super_block *sb,
- struct inode *inode)
-{
- struct snap_super_info *snap_sinfo = S2SNAPI(sb);
- struct fsfilt_operations *sops = snap_sinfo->snap_cache_fsfilt;
- struct snap_info *snap_info, *tmp;
- ino_t *snap_root = NULL;
- int rino_size, snap_count_size, rc = 0;
- ENTRY;
-
- list_for_each_entry_safe(snap_info, tmp, &snap_sinfo->snap_list,
- sni_list) {
- if (snap_info->sni_root_ino == inode->i_ino) {
- RETURN(snap_info);
- }
- }
-
- CDEBUG(D_INFO, "create a new snap info root ino %lu\n", inode->i_ino);
-
- snap_info = smfs_create_snap_info(S2SMI(sb), inode);
-
- if (IS_ERR(snap_info))
- RETURN(snap_info);
-
- snap_sinfo->snap_count++;
-
- rino_size = snap_sinfo->snap_count * sizeof(ino_t);
-
- OBD_ALLOC(snap_root, rino_size);
-
- if (!snap_root)
- GOTO(exit, rc = -ENOMEM);
-
- rc = sops->fs_get_snap_info(I2CI(inode), SNAP_ROOT_INO,
- strlen(SNAP_ROOT_INO), snap_root,
- &rino_size);
- if (rc < 0) {
- if (rc == -ENODATA) {
- rc = 0;
- } else {
- GOTO(exit, rc);
- }
- }
- snap_root[snap_sinfo->snap_count - 1] = inode->i_ino;
-
- snap_count_size = sizeof(int);
- rc = sops->fs_set_snap_info(I2CI(inode), SNAP_COUNT, strlen(SNAP_COUNT),
- &snap_sinfo->snap_count, &snap_count_size);
- if (rc)
- GOTO(exit, rc);
-
- rc = sops->fs_set_snap_info(I2CI(inode), SNAP_ROOT_INO,
- strlen(SNAP_ROOT_INO), snap_root,
- &rino_size);
-
- if (rc)
- GOTO(exit, rc);
-
- list_add(&snap_info->sni_list, &snap_sinfo->snap_list);
-exit:
- if (rc) {
- smfs_cleanup_snap_info(snap_info);
- OBD_FREE(snap_info, sizeof(struct snap_info));
- }
- if (snap_root)
- OBD_FREE(snap_root, rino_size);
- RETURN(snap_info);
-}
-
-int smfs_add_snap_item(struct super_block *sb, char *path_name, char *name)
-{
- struct dentry *dentry = NULL;
- struct snap_info *snap_info;
- int rc = 0;
- ENTRY;
-
- if (!SMFS_DO_COW(S2SMI(sb))) {
- RETURN(0);
- }
-
- if (!path_name || !name) {
- CERROR("patch_name and snapshot_name is NULL");
- RETURN(-EINVAL);
- }
- dentry = smfs_find_snap_root(sb, path_name);
- if (IS_ERR(dentry)) {
- CERROR("can not find snap_shot root by %s\n", path_name);
- RETURN(PTR_ERR(dentry));
- }
- snap_info = smfs_find_create_snap_info(sb, dentry->d_inode);
- if (IS_ERR(snap_info)) {
- CERROR("can not find snap_info by %s rc=%lu\n", path_name,
- PTR_ERR(snap_info));
- GOTO(exit, rc = PTR_ERR(snap_info));
- }
-
- rc = snap_add_item(S2SMI(sb), snap_info, name);
-exit:
- dput(dentry);
- RETURN(rc);
-}
-//EXPORT_SYMBOL(smfs_add_snap_item);
-/*
- * Note: this function should be differnet with snap_do_cow.
- * In smfs_do_cow, we check the EA for whether do cow for that inode.
- * In smfs_needs_cow, we check whether we do need to do cow.
- */
-int smfs_needs_cow(struct inode *inode)
-{
- struct smfs_inode_info *smi_info = I2SMI(inode);
- struct snap_inode_info *snap_info = NULL;
- struct snap snap;
- int index = -1;
- ENTRY;
-
- snap_info = &(smi_info->sm_sninfo);
-
- snap_last(inode, &snap);
- /* decision .... if the snapshot is more recent than the object,
- * then any change to the object should cause a COW.
- */
- if (snap_info->sn_gen < snap.sn_gen )
- index = snap.sn_index;
-
- CDEBUG(D_INFO, "snap_needs_cow, ino %lu , get index %d\n",
- inode->i_ino, index);
-
- RETURN(index);
-} /* snap_needs_cow */
-
-static int link_cowed_inode(struct inode *inode)
-{
- struct dentry *cowed_dir = NULL;
- char idname[LL_ID_NAMELEN];
- struct snap_info *snap_info;
- int idlen = 0, rc = 0;
- struct dentry *dchild = NULL;
- struct dentry *tmp = NULL;
- unsigned mode;
-
- snap_info = smfs_find_snap_info(inode);
- if (!snap_info) {
- CERROR("can not find snap info for inode %p\n", inode);
- RETURN(-EINVAL);
- }
-
- cowed_dir = snap_info->sni_cowed_dentry;
-
- down(&cowed_dir->d_inode->i_sem);
-
- idlen = ll_id2str(idname, inode->i_ino, inode->i_generation);
- dchild = lookup_one_len(idname, cowed_dir, idlen);
- if (IS_ERR(dchild)) {
- rc = PTR_ERR(dchild);
- if (rc != -EPERM && rc != -EACCES)
- CERROR("child lookup error %d\n", rc);
- GOTO(out_lock, rc);
- }
- if (dchild->d_inode != NULL) {
- CERROR("re-cowed file %s?\n", dchild->d_name.name);
- LASSERT(dchild->d_inode == inode);
- GOTO(out_dput, rc = 0);
- }
- tmp = pre_smfs_dentry(NULL, inode, cowed_dir);
- /* link() is semanticaly-wrong for S_IFDIR, so we set S_IFREG
- * for linking and return real mode back then -bzzz */
- mode = inode->i_mode;
- inode->i_mode = S_IFREG;
-
- rc = cowed_dir->d_inode->i_op->link(tmp, cowed_dir->d_inode, dchild);
-
- post_smfs_dentry(tmp);
- if (rc) {
- CERROR("error linking cowed inode %s to COWED: rc = %d\n",
- idname, rc);
- }
- inode->i_mode = mode;
- if ((mode & S_IFMT) == S_IFDIR) {
- dchild->d_inode->i_nlink++;
- cowed_dir->d_inode->i_nlink++;
- mark_inode_dirty(cowed_dir->d_inode);
- mark_inode_dirty(dchild->d_inode);
- }
-out_dput:
- up(&cowed_dir->d_inode->i_sem);
- dput(dchild);
-out_lock:
- RETURN(rc);
-}
-/*
- * Make a copy of the data and plug a redirector in between if there
- * is no redirector yet.
- */
-int snap_do_cow(struct inode *inode, struct dentry *dparent, int del)
-{
- struct fsfilt_operations *snapops = I2SNAPCOPS(inode);
- struct snap snap;
- struct inode *cache_ind = NULL;
- ENTRY;
-
- if (!snapops || !snapops->fs_create_indirect)
- RETURN(-EINVAL);
-
- snap_last(inode, &snap);
- cache_ind = snapops->fs_create_indirect(I2CI(inode), snap.sn_index,
- snap.sn_gen, I2CI(dparent->d_inode),
- del);
- if(cache_ind && IS_ERR(cache_ind)) {
- CERROR("Create ind inode %lu index %d gen %d del %d rc%lu\n",
- inode->i_ino, snap.sn_index, snap.sn_gen, del,
- PTR_ERR(cache_ind));
- RETURN(PTR_ERR(cache_ind));
- }
- if (cache_ind) {
- iput(cache_ind);
- if (!SMFS_DO_INODE_COWED(inode)) {
- /*insert the inode to cowed inode*/
- SMFS_SET_INODE_COWED(inode);
- link_cowed_inode(inode);
- }
- }
- RETURN(0);
-}
-/*Dir inode will do cow*/
-int smfs_cow_create_pre(struct inode *dir, void *de, void *data1, void *data2)
-{
- struct dentry *dparent;
- struct dentry *dentry = (struct dentry *)de;
- int rc = 0;
- ENTRY;
-
- if (smfs_needs_cow(dir) != -1) {
- CDEBUG(D_INODE, "snap_needs_cow for ino %lu \n",dir->i_ino);
- LASSERT(dentry->d_parent && dentry->d_parent->d_parent);
- dparent = dentry->d_parent->d_parent;
- if ((rc = snap_do_cow(dir, dparent, 0))) {
- CERROR("Do cow error %d\n", rc);
- RETURN(-EINVAL);
- }
- }
- RETURN(rc);
-}
-
-int smfs_cow_setattr_pre(struct inode *dir, void *de, void *data1, void *data2)
-{
- struct dentry *dentry = (struct dentry *)de;
- int rc = 0;
- ENTRY;
- if (smfs_needs_cow(dir) != -1) {
- CDEBUG(D_INODE, "snap_needs_cow for ino %lu \n",dir->i_ino);
- if ((snap_do_cow(dir, dentry->d_parent, 0))) {
- CERROR("Do cow error\n");
- RETURN(-EINVAL);
- }
- }
- RETURN(rc);
-}
-
-int smfs_cow_link_pre(struct inode *dir, void *de, void *data1, void *data2)
-{
- struct dentry *dparent;
- struct dentry *dentry = (struct dentry *)de;
- int rc = 0;
- ENTRY;
-
- if (smfs_needs_cow(dir) != -1) {
- CDEBUG(D_INODE, "snap_needs_cow for ino %lu \n",dir->i_ino);
- LASSERT(dentry->d_parent && dentry->d_parent->d_parent);
- dparent = dentry->d_parent->d_parent;
- if ((snap_do_cow(dir, dparent, 0))) {
- CERROR("Do cow error\n");
- RETURN(-EINVAL);
- }
- if ((snap_do_cow(dentry->d_inode, dentry->d_parent, 0))) {
- CERROR("Do cow error\n");
- RETURN(-EINVAL);
- }
- }
- RETURN(rc);
-}
-
-int smfs_cow_unlink_pre(struct inode *dir, void *de, void *data1, void *data2)
-{
- struct dentry *dentry = (struct dentry *)de;
- struct dentry *dparent;
- int rc = 0;
- ENTRY;
-
- if (smfs_needs_cow(dir) != -1) {
- CDEBUG(D_INODE, "snap_needs_cow for ino %lu \n",dir->i_ino);
- LASSERT(dentry->d_parent && dentry->d_parent->d_parent);
- dparent = dentry->d_parent->d_parent;
- if ((snap_do_cow(dir, dparent, 0))) {
- CERROR("Do cow error\n");
- RETURN(-EINVAL);
- }
- if ((snap_do_cow(dentry->d_inode, dentry->d_parent, 1))) {
- CERROR("Do cow error\n");
- RETURN(-EINVAL);
- }
-
- }
- RETURN(rc);
-}
-
-int smfs_cow_rename_pre(struct inode *dir, void *de, void *data1, void *data2)
-{
- struct dentry *dentry = (struct dentry*)de;
- struct inode *new_dir = (struct inode *)data1;
- struct dentry *new_dentry = (struct dentry *)data2;
- struct dentry *dparent;
- int rc = 0;
- ENTRY;
-
- LASSERT(new_dir);
- LASSERT(new_dentry);
- if (smfs_needs_cow(dir) != -1) {
- CDEBUG(D_INODE, "snap_needs_cow for ino %lu \n", dir->i_ino);
- LASSERT(dentry->d_parent && dentry->d_parent->d_parent);
- dparent = dentry->d_parent->d_parent;
- if ((snap_do_cow(dir, dparent, 0))) {
- CERROR("Do cow error\n");
- RETURN(-EINVAL);
- }
- if ((snap_do_cow(dentry->d_inode, dentry->d_parent, 0))) {
- CERROR("Do cow error\n");
- RETURN(-EINVAL);
- }
- }
- if (smfs_needs_cow(new_dir) != -1) {
- CDEBUG(D_INODE, "snap_needs_cow for ino %lu \n", new_dir->i_ino);
- LASSERT(new_dentry->d_parent && new_dentry->d_parent->d_parent);
- dparent = new_dentry->d_parent->d_parent;
- if ((new_dir != dir) && (snap_do_cow(new_dir, dparent, 0))){
- CERROR("Do cow error\n");
- RETURN(-EINVAL);
- }
- if (new_dentry->d_inode && new_dentry->d_inode->i_nlink == 1) {
- if ((snap_do_cow(new_dentry->d_inode,
- new_dentry->d_parent, 0))) {
- CERROR("Do cow error\n");
- RETURN(-EINVAL);
- }
- }
- }
- RETURN(rc);
-}
-
-int smfs_cow_write_pre(struct inode *inode, void *de, void *data1, void *data2)
-{
- struct dentry *dentry = (struct dentry*)de;
- struct snap_info *snap_info = NULL;
- struct snap_table *table;
- long blocks[2]={-1,-1};
- int index = 0, i, rc = 0;
- size_t count;
- loff_t pos;
-
- ENTRY;
-
- snap_info = smfs_find_snap_info(inode);
- if (!snap_info) {
- CDEBUG(D_INFO, "can not find snap info for inode %p\n", inode);
- RETURN(0);
- }
- table = snap_info->sni_table;
-
- LASSERT(data1);
- LASSERT(data2);
-
- count = *(size_t *)data1;
- pos = *(loff_t*)data2;
-
- down(&inode->i_sem);
-
- if (smfs_needs_cow(inode) != -1 ) {
- CDEBUG(D_INFO, "snap_needs_cow for ino %lu \n",inode->i_ino);
- snap_do_cow(inode, dentry->d_parent, 0);
- }
-
- CDEBUG(D_INFO, "write offset %lld count %u \n", pos, count);
-
- if(pos & (PAGE_CACHE_SIZE - 1)){
- blocks[0] = pos >> inode->i_sb->s_blocksize_bits;
- }
- pos += count - 1;
- if((pos + 1) & (PAGE_CACHE_SIZE - 1)){
- blocks[1] = pos >> inode->i_sb->s_blocksize_bits;
- }
-
- if (blocks[0] == blocks[1])
- blocks[1] = -1;
-
- for (i = 0; i < 2; i++) {
- int slot = 0;
- if (blocks[i] == -1)
- continue;
- /*Find the nearest page in snaptable and copy back it*/
- for (slot = table->sntbl_count - 1; slot >= 0; slot--) {
- struct fsfilt_operations *sops = I2SNAPCOPS(inode);
- struct inode *cind = NULL;
- int result = 0;
-
- index = table->sntbl_items[slot].sn_index;
- cind = sops->fs_get_indirect(I2CI(inode), NULL, index);
- if (!cind) continue;
-
- CDEBUG(D_INFO, "find cache_ino %lu\n", cind->i_ino);
-
- result = sops->fs_copy_block(I2CI(inode), cind,
- blocks[i]);
- if (result == 1) {
- iput(cind);
- result = 0;
- break;
- }
- if (result < 0) {
- iput(cind);
- up(&inode->i_sem);
- GOTO(exit, rc = result);
- }
- iput(cind);
- }
- }
-exit:
- up(&inode->i_sem);
- RETURN(rc);
-}
-EXPORT_SYMBOL(smfs_cow_write_pre);
-/*lookup inode in dotsnap inode */
-static int smfs_dotsnap_lookup(struct inode *dir, struct dentry *dentry,
- struct snap_info *snap_info)
-{
- if (dentry->d_name.len == 1 &&
- !strcmp(dentry->d_name.name, ".")) {
- d_add(dentry, iget(dir->i_sb, dir->i_ino));
- } else if (dentry->d_name.len == 2 &&
- !strcmp(dentry->d_name.name, "..")) {
- struct inode *inode;
- struct dentry *dparent = dentry->d_parent;
- if (dparent->d_inode) {
- inode = iget(dir->i_sb, dparent->d_inode->i_ino);
- if (inode) {
- if (!is_bad_inode(inode))
- d_add(dentry, inode);
- else
- iput(inode);
- }
- }
- } else {
- /*find the name from the snaptable*/
- struct fsfilt_operations *sops = I2SNAPCOPS(dir);
- struct snap_table *table;
- struct inode *inode;
- ino_t cino;
- int i = 0, index = -1;
-
- table = snap_info->sni_table;
-
- for (i = 0; i < table->sntbl_count; i++) {
- char *name = table->sntbl_items[i].sn_name;
- if ((dentry->d_name.len == strlen(name)) &&
- (memcmp(dentry->d_name.name, name,
- dentry->d_name.len) == 0)) {
- index = table->sntbl_items[i].sn_index;
- break;
- }
- }
- if (index == -1) {
- CERROR("No such %s in this .snap dir \n",
- dentry->d_name.name);
- RETURN(-ENOENT);
- }
- cino = sops->fs_get_indirect_ino(S2CSB(dir->i_sb), dir->i_ino,
- index);
- if (cino == 0)
- cino = dir->i_ino;
- inode = smfs_get_inode(dir->i_sb, cino, dir, index);
- if (!inode || is_bad_inode(inode)) {
- CERROR("Can not find cino %lu inode\n", cino);
- RETURN(-ENOENT);
- }
- smfs_init_snap_inode_info(inode, dir, index);
- d_add(dentry, inode);
- }
- RETURN(0);
-}
-int smfs_cow_lookup_pre(struct inode *inode, void *de, void *data1,
- void *data2)
-{
- struct dentry *dentry = (struct dentry*)de;
- struct snap_info *snap_info;
- struct snap_dot_info *dot_info;
- int rc = 0;
- ENTRY;
-
- snap_info = smfs_find_snap_info(inode);
- if (!snap_info) {
- CDEBUG(D_INFO, "can not find snap info for inode %p\n", inode);
- RETURN(0);
- }
-
- dot_info = snap_info->sni_dot_info;
-
- if (smfs_primary_inode(inode) &&
- dentry->d_name.len == dot_info->dot_name_len &&
- memcmp(dentry->d_name.name, dot_info->dot_name,
- strlen(dot_info->dot_name)) == 0) {
- struct inode *dot_inode = NULL;
-
- dot_inode = smfs_get_inode(inode->i_sb, inode->i_ino, inode,
- DOT_SNAP_INDEX);
- smfs_init_snap_inode_info(dot_inode, inode, DOT_SNAP_INDEX);
- d_add(dentry, dot_inode);
- rc = 1;
- RETURN(rc);
- } else if (smfs_dotsnap_inode(inode)) {
- rc = smfs_dotsnap_lookup(inode, dentry, snap_info);
- if (rc == 0)
- rc = 1;
- RETURN(rc);
- } else {
- /*HERE: will replace ino in dentry->d_name according to index,
- *For iopen, will fix it in integrating snapfs to Lustre*/
-#if 0
- struct fsfilt_operations *snapops = I2SNAPOPS(inode);
- char *name = (char *)dentry->d_name.name;
- unsigned long ino, hash, ind_ino;
- int len = sizeof(ind_ino);
-
- ino = simple_strtoul(name, 0, 0);
-
- ind_ino = snapops->fs_get_indirect_ino(inode->i_sb, ino, index);
-
- snprintf(name, strlen(name), "0x%lx", ind_ino);
-
- hash = init_name_hash();
- while (len--) {
- unsigned char c;
- c = *(const unsigned char *)name++;
- if (c == '\0') break;
- hash = partial_name_hash(c, hash);
- }
- dentry->d_name.hash = end_name_hash(hash);
-#endif
- }
- RETURN(rc);
-}
-
-struct inode *smfs_cow_get_ind(struct inode *inode, int index)
-{
- long block=(index << PAGE_CACHE_SHIFT) >> inode->i_sb->s_blocksize_bits;
- struct fsfilt_operations *sops = I2SNAPCOPS(inode);
- struct snap_info *snap_info = NULL;
- struct snap_table *table = NULL;
- int slot;
-
- ENTRY;
-
- snap_info = smfs_find_snap_info(inode);
- if (!snap_info) {
- CDEBUG(D_INFO, "can not find snap info for inode %p\n", inode);
- RETURN(NULL);
- }
-
- table = snap_info->sni_table;
-
- for (slot = table->sntbl_count - 1; slot >= 0; slot--) {
- struct address_space_operations *aops = inode->i_mapping->a_ops;
- struct inode *cache_inode = NULL;
- int index = 0;
-
- index = table->sntbl_items[slot].sn_index;
- cache_inode = sops->fs_get_indirect(I2CI(inode), NULL, index);
-
- if (!cache_inode ) continue;
-
- if (aops->bmap(cache_inode->i_mapping, block))
- RETURN(cache_inode);
- iput(cache_inode);
- }
-
- RETURN(NULL);
-}
-EXPORT_SYMBOL(smfs_cow_get_ind);
-
-static int smfs_cow_readdir_pre(struct inode *dir, void *de, void *data1,
- void *data2)
-{
- struct file *filp = (struct file*)de;
- void *dirent = data1;
- filldir_t filldir = (filldir_t)data2;
- struct snap_info *snap_info = NULL;
-
- if (smfs_under_dotsnap_inode(dir))
- RETURN(0);
-
- snap_info = smfs_find_snap_info(dir);
-
- if (!snap_info) {
- CDEBUG(D_INFO, "can not find snap info for ino %lu\n",
- dir->i_ino);
- RETURN(-EINVAL);
- }
-
- if (smfs_primary_inode(dir)) {
- if (filp->f_pos == 0) {
- struct snap_dot_info *dot = snap_info->sni_dot_info;
- if (filldir(dirent, dot->dot_name, dot->dot_name_len,
- filp->f_pos, -1, 0)) {
- CERROR("fill .snap error \n");
- RETURN(-EINVAL);
- }
- } else {
- filp->f_pos -= 1;
- }
- } else if (smfs_dotsnap_inode(dir)) {
- struct snap_table *table = snap_info->sni_table;
- int i = 0;
-
- if (filp->f_pos < 0)
- RETURN(-EINVAL);
-
- if ((filp->f_pos == 0) && filldir(dirent, ".", 1,
- filp->f_pos++,
- dir->i_ino, 0) < 0)
- RETURN(-EIO);
- if ((filp->f_pos == 1) && filldir(dirent, "..", 2,
- filp->f_pos++,
- dir->i_ino, 0) < 0)
- RETURN(-EIO);
-
- for (i = filp->f_pos - 2; i < table->sntbl_count; i++,
- filp->f_pos++) {
- int slot = table->sntbl_count - i - 1;
-
- if (filldir(dirent, table->sntbl_items[slot].sn_name,
- strlen(table->sntbl_items[slot].sn_name),
- filp->f_pos, dir->i_ino, 0))
- break;
-
- }
- RETURN(1);
- }
-
- RETURN(0);
-}
-
-
-typedef int (*cow_funcs)(struct inode *dir, void *dentry, void *new_dir,
- void *new_dentry);
-
-static cow_funcs smfs_cow_pre_funcs[HOOK_MAX + 1] = {
- [HOOK_CREATE] smfs_cow_create_pre,
- [HOOK_LOOKUP] smfs_cow_lookup_pre,
- [HOOK_LINK] smfs_cow_link_pre,
- [HOOK_UNLINK] smfs_cow_unlink_pre,
- [HOOK_SYMLINK] smfs_cow_create_pre,
- [HOOK_MKDIR] smfs_cow_create_pre,
- [HOOK_RMDIR] smfs_cow_unlink_pre,
- [HOOK_MKNOD] smfs_cow_create_pre,
- [HOOK_RENAME] smfs_cow_rename_pre,
- [HOOK_SETATTR] smfs_cow_setattr_pre,
- [HOOK_WRITE] smfs_cow_write_pre,
- [HOOK_READDIR] smfs_cow_readdir_pre,
-};
-
-static int smfs_revalidate_dotsnap_dentry(struct dentry *dentry,
- struct inode *dir, int index)
-{
- struct inode *inode = dentry->d_inode;
- ENTRY;
-
- if (!inode)
- RETURN(0);
-
- if (index > 0 && index != DOT_SNAP_INDEX) {
- struct fsfilt_operations *sops = I2SNAPCOPS(inode);
- struct inode *cache_ind = NULL;
-
- cache_ind = sops->fs_get_indirect(I2CI(inode), NULL, index);
-
- if (cache_ind) {
- struct inode *ind_inode = NULL;
-
- LASSERT(cache_ind->i_ino != I2CI(inode)->i_ino);
-
- ind_inode = smfs_get_inode(inode->i_sb, cache_ind->i_ino,
- dir, index);
- list_del_init(&dentry->d_alias);
- iput(inode);
- d_instantiate(dentry, ind_inode);
- iput(cache_ind);
- }
- }
- RETURN(0);
-}
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
-static int
-smfs_revalidate_nd(struct dentry *de, struct nameidata *nd)
-{
- struct inode *inode = de->d_inode;
- ENTRY;
-
- if (!inode)
- RETURN(0);
-
- if (smfs_under_dotsnap_inode(inode)) {
- struct inode *dir = de->d_parent->d_inode;
- int index = I2SNAPI(inode)->sn_index;
-
- smfs_revalidate_dotsnap_dentry(de, dir, index);
- smfs_init_snap_inode_info(de->d_inode, dir, index);
- }
-
- RETURN(0);
-}
-#else
-static int
-smfs_revalidate_it(struct dentry *de, int flags,
- struct nameidata *nd,
- struct lookup_intent *it)
-{
- struct inode *inode = de->d_inode;
- ENTRY;
-
- if (!inode)
- RETURN(0);
-
- if (smfs_under_dotsnap_inode(inode)) {
- struct inode *dir = de->d_parent->d_inode;
- int index = I2SNAPI(inode)->sn_index;
-
- smfs_revalidate_dotsnap_dentry(de, dir, index);
- smfs_init_snap_inode_info(de->d_inode, dir, index);
- }
-
- RETURN(0);
-}
-#endif
-
-static int smfs_delete_dentry(struct dentry *dentry)
-{
- dentry->d_op = NULL;
- return 0;
-}
-
-struct dentry_operations smfs_cow_dops = {
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
- .d_revalidate = smfs_revalidate_nd,
-#else
- .d_revalidate_it = smfs_revalidate_it,
-#endif
- .d_delete = smfs_delete_dentry,
-};
-
-int smfs_cow_lookup_post(struct inode *dir, void *de, void *data1,
- void *data2)
-{
- struct dentry *dentry = (struct dentry*)de;
- struct inode *inode = dentry->d_inode;
- ENTRY;
-
- if (inode && smfs_under_dotsnap_inode(inode)) {
- int index = I2SNAPI(dir)->sn_index;
-
- smfs_revalidate_dotsnap_dentry(dentry, dir, index);
- smfs_init_snap_inode_info(inode, dir, index);
- }
- dentry->d_op = &smfs_cow_dops;
- RETURN(0);
-}
-
-static int smfs_cow_readdir_post(struct inode *dir, void *de, void *data1,
- void *data2)
-{
- struct file *filp = (struct file*)de;
-
- if (smfs_primary_inode(dir)) {
- filp->f_pos += 1;
- }
- RETURN(0);
-}
-
-
-static cow_funcs smfs_cow_post_funcs[HOOK_MAX + 1] = {
- [HOOK_CREATE] NULL,
- [HOOK_LOOKUP] smfs_cow_lookup_post,
- [HOOK_LINK] NULL,
- [HOOK_UNLINK] NULL,
- [HOOK_SYMLINK] NULL,
- [HOOK_MKDIR] NULL,
- [HOOK_RMDIR] NULL,
- [HOOK_MKNOD] NULL,
- [HOOK_RENAME] NULL,
- [HOOK_SETATTR] NULL,
- [HOOK_WRITE] NULL,
- [HOOK_READDIR] smfs_cow_readdir_post,
-};
-
-static int smfs_cow_pre(struct inode *dir, void *dentry, void *new_dir,
- void *new_dentry, int op)
-{
- if (smfs_cow_pre_funcs[op]) {
- return smfs_cow_pre_funcs[op](dir, dentry, new_dir, new_dentry);
- }
- return 0;
-}
-
-static int smfs_cow_post(struct inode *dir, void *dentry, void *new_dir,
- void *new_dentry, int op)
-{
- if (smfs_cow_post_funcs[op]) {
- return smfs_cow_post_funcs[op](dir, dentry, new_dir, new_dentry);
- }
- return 0;
-}
-
git://git.whamcloud.com / fs / lustre-release.git / blobdiff