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[/] [or1k/] [tags/] [LINUX_2_4_26_OR32/] [linux/] [linux-2.4/] [fs/] [intermezzo/] [super.c] - Rev 1765
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/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*- * vim:expandtab:shiftwidth=8:tabstop=8: * * Copyright (C) 1998 Peter J. Braam <braam@clusterfs.com> * Copyright (C) 2000 Stelias Computing, Inc. * Copyright (C) 2000 Red Hat, Inc. * * This file is part of InterMezzo, http://www.inter-mezzo.org. * * InterMezzo 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. * * InterMezzo 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 InterMezzo; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * * presto's super.c */ static char rcsid[] __attribute ((unused)) = "$Id: super.c,v 1.1.1.1 2004-04-15 01:09:15 phoenix Exp $"; #define INTERMEZZO_VERSION "$Revision: 1.1.1.1 $" #include <stdarg.h> #include <asm/bitops.h> #include <asm/uaccess.h> #include <asm/system.h> #include <linux/errno.h> #include <linux/fs.h> #include <linux/ext2_fs.h> #include <linux/slab.h> #include <linux/vmalloc.h> #include <linux/sched.h> #include <linux/stat.h> #include <linux/string.h> #include <linux/locks.h> #include <linux/blkdev.h> #include <linux/init.h> #include <linux/devfs_fs_kernel.h> #define __NO_VERSION__ #include <linux/module.h> #include <linux/intermezzo_fs.h> #include <linux/intermezzo_psdev.h> #ifdef PRESTO_DEBUG long presto_vmemory = 0; long presto_kmemory = 0; #endif /* returns an allocated string, copied out from data if opt is found */ static char *opt_read(const char *opt, char *data) { char *value; char *retval; CDEBUG(D_SUPER, "option: %s, data %s\n", opt, data); if ( strncmp(opt, data, strlen(opt)) ) return NULL; if ( (value = strchr(data, '=')) == NULL ) return NULL; value++; PRESTO_ALLOC(retval, strlen(value) + 1); if ( !retval ) { CERROR("InterMezzo: Out of memory!\n"); return NULL; } strcpy(retval, value); CDEBUG(D_SUPER, "Assigned option: %s, value %s\n", opt, retval); return retval; } static void opt_store(char **dst, char *opt) { if (!dst) CERROR("intermezzo: store_opt, error dst == NULL\n"); if (*dst) PRESTO_FREE(*dst, strlen(*dst) + 1); *dst = opt; } static void opt_set_default(char **dst, char *defval) { if (!dst) CERROR("intermezzo: store_opt, error dst == NULL\n"); if (*dst) PRESTO_FREE(*dst, strlen(*dst) + 1); if (defval) { char *def_alloced; PRESTO_ALLOC(def_alloced, strlen(defval)+1); if (!def_alloced) { CERROR("InterMezzo: Out of memory!\n"); return ; } strcpy(def_alloced, defval); *dst = def_alloced; } } /* Find the options for InterMezzo in "options", saving them into the * passed pointers. If the pointer is null, the option is discarded. * Copy out all non-InterMezzo options into cache_data (to be passed * to the read_super operation of the cache). The return value will * be a pointer to the end of the cache_data. */ static char *presto_options(struct super_block *sb, char *options, char *cache_data, char **cache_type, char **fileset, char **channel) { char *this_char; char *cache_data_end = cache_data; /* set the defaults */ if (strcmp(sb->s_type->name, "intermezzo") == 0) opt_set_default(cache_type, "ext3"); else opt_set_default(cache_type, "tmpfs"); if (!options || !cache_data) return cache_data_end; CDEBUG(D_SUPER, "parsing options\n"); for (this_char = strtok (options, ","); this_char != NULL; this_char = strtok (NULL, ",")) { char *opt; CDEBUG(D_SUPER, "this_char %s\n", this_char); if ( (opt = opt_read("fileset", this_char)) ) { opt_store(fileset, opt); continue; } if ( (opt = opt_read("cache_type", this_char)) ) { opt_store(cache_type, opt); continue; } if ( (opt = opt_read("channel", this_char)) ) { opt_store(channel, opt); continue; } cache_data_end += sprintf(cache_data_end, "%s%s", cache_data_end != cache_data ? ",":"", this_char); } return cache_data_end; } static int presto_set_channel(struct presto_cache *cache, char *channel) { int minor; ENTRY; if (!channel) { minor = izo_psdev_get_free_channel(); } else { minor = simple_strtoul(channel, NULL, 0); } if (minor < 0 || minor >= MAX_CHANNEL) { CERROR("all channels in use or channel too large %d\n", minor); return -EINVAL; } cache->cache_psdev = &(izo_channels[minor]); list_add(&cache->cache_channel_list, &cache->cache_psdev->uc_cache_list); EXIT; return minor; } /* We always need to remove the presto options before passing mount options to cache FS */ struct super_block * presto_read_super(struct super_block * sb, void * data, int silent) { struct file_system_type *fstype; struct presto_cache *cache = NULL; char *cache_data = NULL; char *cache_data_end; char *cache_type = NULL; char *fileset = NULL; char *channel = NULL; int err; unsigned int minor; ENTRY; /* reserve space for the cache's data */ PRESTO_ALLOC(cache_data, PAGE_SIZE); if ( !cache_data ) { CERROR("presto_read_super: Cannot allocate data page.\n"); EXIT; goto out_err; } /* read and validate options */ cache_data_end = presto_options(sb, data, cache_data, &cache_type, &fileset, &channel); /* was there anything for the cache filesystem in the data? */ if (cache_data_end == cache_data) { PRESTO_FREE(cache_data, PAGE_SIZE); cache_data = NULL; } else { CDEBUG(D_SUPER, "cache_data at %p is: %s\n", cache_data, cache_data); } /* set up the cache */ cache = presto_cache_init(); if ( !cache ) { CERROR("presto_read_super: failure allocating cache.\n"); EXIT; goto out_err; } cache->cache_type = cache_type; /* link cache to channel */ minor = presto_set_channel(cache, channel); if (minor < 0) { EXIT; goto out_err; } CDEBUG(D_SUPER, "Presto: type=%s, fset=%s, dev= %d, flags %x\n", cache_type, fileset?fileset:"NULL", minor, cache->cache_flags); MOD_INC_USE_COUNT; /* get the filter for the cache */ fstype = get_fs_type(cache_type); cache->cache_filter = filter_get_filter_fs((const char *)cache_type); if ( !fstype || !cache->cache_filter) { CERROR("Presto: unrecognized fs type or cache type\n"); MOD_DEC_USE_COUNT; EXIT; goto out_err; } /* can we in fact mount the cache */ if ((fstype->fs_flags & FS_REQUIRES_DEV) && !sb->s_bdev) { CERROR("filesystem \"%s\" requires a valid block device\n", cache_type); MOD_DEC_USE_COUNT; EXIT; goto out_err; } sb = fstype->read_super(sb, cache_data, silent); /* this might have been freed above */ if (cache_data) { PRESTO_FREE(cache_data, PAGE_SIZE); cache_data = NULL; } if ( !sb ) { CERROR("InterMezzo: cache mount failure.\n"); MOD_DEC_USE_COUNT; EXIT; goto out_err; } cache->cache_sb = sb; cache->cache_root = dget(sb->s_root); /* we now know the dev of the cache: hash the cache */ presto_cache_add(cache, sb->s_dev); err = izo_prepare_fileset(sb->s_root, fileset); filter_setup_journal_ops(cache->cache_filter, cache->cache_type); /* make sure we have our own super operations: sb still contains the cache operations */ filter_setup_super_ops(cache->cache_filter, sb->s_op, &presto_super_ops); sb->s_op = filter_c2usops(cache->cache_filter); /* get izo directory operations: sb->s_root->d_inode exists now */ filter_setup_dir_ops(cache->cache_filter, sb->s_root->d_inode, &presto_dir_iops, &presto_dir_fops); filter_setup_dentry_ops(cache->cache_filter, sb->s_root->d_op, &presto_dentry_ops); sb->s_root->d_inode->i_op = filter_c2udiops(cache->cache_filter); sb->s_root->d_inode->i_fop = filter_c2udfops(cache->cache_filter); sb->s_root->d_op = filter_c2udops(cache->cache_filter); EXIT; return sb; out_err: CDEBUG(D_SUPER, "out_err called\n"); if (cache) PRESTO_FREE(cache, sizeof(struct presto_cache)); if (cache_data) PRESTO_FREE(cache_data, PAGE_SIZE); if (fileset) PRESTO_FREE(fileset, strlen(fileset) + 1); if (channel) PRESTO_FREE(channel, strlen(channel) + 1); if (cache_type) PRESTO_FREE(cache_type, strlen(cache_type) + 1); CDEBUG(D_MALLOC, "mount error exit: kmem %ld, vmem %ld\n", presto_kmemory, presto_vmemory); return NULL; } #ifdef PRESTO_DEVEL static DECLARE_FSTYPE(presto_fs_type, "izo", presto_read_super, FS_REQUIRES_DEV); static DECLARE_FSTYPE(vpresto_fs_type, "vintermezzo", presto_read_super, FS_LITTER); #else static DECLARE_FSTYPE(vpresto_fs_type, "vintermezzo", presto_read_super, FS_LITTER); static DECLARE_FSTYPE(presto_fs_type, "intermezzo", presto_read_super, FS_REQUIRES_DEV); #endif int __init init_intermezzo_fs(void) { int status; printk(KERN_INFO "InterMezzo Kernel/Intersync communications " INTERMEZZO_VERSION " info@clusterfs.com\n"); status = presto_psdev_init(); if ( status ) { CERROR("Problem (%d) in init_intermezzo_psdev\n", status); return status; } status = init_intermezzo_sysctl(); if (status) { CERROR("presto: failed in init_intermezzo_sysctl!\n"); } presto_cache_init_hash(); if (!presto_init_ddata_cache()) { CERROR("presto out of memory!\n"); return -ENOMEM; } status = register_filesystem(&presto_fs_type); if (status) { CERROR("presto: failed in register_filesystem!\n"); } status = register_filesystem(&vpresto_fs_type); if (status) { CERROR("vpresto: failed in register_filesystem!\n"); } return status; } void __exit exit_intermezzo_fs(void) { int err; ENTRY; if ( (err = unregister_filesystem(&presto_fs_type)) != 0 ) { CERROR("presto: failed to unregister filesystem\n"); } if ( (err = unregister_filesystem(&vpresto_fs_type)) != 0 ) { CERROR("vpresto: failed to unregister filesystem\n"); } presto_psdev_cleanup(); cleanup_intermezzo_sysctl(); presto_cleanup_ddata_cache(); CERROR("after cleanup: kmem %ld, vmem %ld\n", presto_kmemory, presto_vmemory); } MODULE_AUTHOR("Cluster Filesystems Inc. <info@clusterfs.com>"); MODULE_DESCRIPTION("InterMezzo Kernel/Intersync communications " INTERMEZZO_VERSION); MODULE_LICENSE("GPL"); module_init(init_intermezzo_fs) module_exit(exit_intermezzo_fs)