124bbb1faSMichael Holzheu /* 224bbb1faSMichael Holzheu * fs/hypfs/inode.c 324bbb1faSMichael Holzheu * Hypervisor filesystem for Linux on s390. 424bbb1faSMichael Holzheu * 524bbb1faSMichael Holzheu * Copyright (C) IBM Corp. 2006 624bbb1faSMichael Holzheu * Author(s): Michael Holzheu <holzheu@de.ibm.com> 724bbb1faSMichael Holzheu */ 824bbb1faSMichael Holzheu 924bbb1faSMichael Holzheu #include <linux/types.h> 1024bbb1faSMichael Holzheu #include <linux/errno.h> 1124bbb1faSMichael Holzheu #include <linux/fs.h> 1224bbb1faSMichael Holzheu #include <linux/namei.h> 1324bbb1faSMichael Holzheu #include <linux/vfs.h> 1424bbb1faSMichael Holzheu #include <linux/pagemap.h> 1524bbb1faSMichael Holzheu #include <linux/gfp.h> 1624bbb1faSMichael Holzheu #include <linux/time.h> 1724bbb1faSMichael Holzheu #include <linux/parser.h> 1824bbb1faSMichael Holzheu #include <linux/sysfs.h> 1924bbb1faSMichael Holzheu #include <linux/module.h> 2024bbb1faSMichael Holzheu #include <asm/ebcdic.h> 2124bbb1faSMichael Holzheu #include "hypfs.h" 2224bbb1faSMichael Holzheu #include "hypfs_diag.h" 2324bbb1faSMichael Holzheu 2424bbb1faSMichael Holzheu #define HYPFS_MAGIC 0x687970 /* ASCII 'hyp' */ 2524bbb1faSMichael Holzheu #define TMP_SIZE 64 /* size of temporary buffers */ 2624bbb1faSMichael Holzheu 2724bbb1faSMichael Holzheu static struct dentry *hypfs_create_update_file(struct super_block *sb, 2824bbb1faSMichael Holzheu struct dentry *dir); 2924bbb1faSMichael Holzheu 3024bbb1faSMichael Holzheu struct hypfs_sb_info { 3124bbb1faSMichael Holzheu uid_t uid; /* uid used for files and dirs */ 3224bbb1faSMichael Holzheu gid_t gid; /* gid used for files and dirs */ 3324bbb1faSMichael Holzheu struct dentry *update_file; /* file to trigger update */ 3424bbb1faSMichael Holzheu time_t last_update; /* last update time in secs since 1970 */ 3524bbb1faSMichael Holzheu struct mutex lock; /* lock to protect update process */ 3624bbb1faSMichael Holzheu }; 3724bbb1faSMichael Holzheu 3824bbb1faSMichael Holzheu static struct file_operations hypfs_file_ops; 3924bbb1faSMichael Holzheu static struct file_system_type hypfs_type; 4024bbb1faSMichael Holzheu static struct super_operations hypfs_s_ops; 4124bbb1faSMichael Holzheu 4224bbb1faSMichael Holzheu /* start of list of all dentries, which have to be deleted on update */ 4324bbb1faSMichael Holzheu static struct dentry *hypfs_last_dentry; 4424bbb1faSMichael Holzheu 4524bbb1faSMichael Holzheu static void hypfs_update_update(struct super_block *sb) 4624bbb1faSMichael Holzheu { 4724bbb1faSMichael Holzheu struct hypfs_sb_info *sb_info = sb->s_fs_info; 4824bbb1faSMichael Holzheu struct inode *inode = sb_info->update_file->d_inode; 4924bbb1faSMichael Holzheu 5024bbb1faSMichael Holzheu sb_info->last_update = get_seconds(); 5124bbb1faSMichael Holzheu inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 5224bbb1faSMichael Holzheu } 5324bbb1faSMichael Holzheu 5424bbb1faSMichael Holzheu /* directory tree removal functions */ 5524bbb1faSMichael Holzheu 5624bbb1faSMichael Holzheu static void hypfs_add_dentry(struct dentry *dentry) 5724bbb1faSMichael Holzheu { 5824bbb1faSMichael Holzheu dentry->d_fsdata = hypfs_last_dentry; 5924bbb1faSMichael Holzheu hypfs_last_dentry = dentry; 6024bbb1faSMichael Holzheu } 6124bbb1faSMichael Holzheu 6224bbb1faSMichael Holzheu static void hypfs_remove(struct dentry *dentry) 6324bbb1faSMichael Holzheu { 6424bbb1faSMichael Holzheu struct dentry *parent; 6524bbb1faSMichael Holzheu 6624bbb1faSMichael Holzheu parent = dentry->d_parent; 6724bbb1faSMichael Holzheu if (S_ISDIR(dentry->d_inode->i_mode)) 6824bbb1faSMichael Holzheu simple_rmdir(parent->d_inode, dentry); 6924bbb1faSMichael Holzheu else 7024bbb1faSMichael Holzheu simple_unlink(parent->d_inode, dentry); 7124bbb1faSMichael Holzheu d_delete(dentry); 7224bbb1faSMichael Holzheu dput(dentry); 7324bbb1faSMichael Holzheu } 7424bbb1faSMichael Holzheu 7524bbb1faSMichael Holzheu static void hypfs_delete_tree(struct dentry *root) 7624bbb1faSMichael Holzheu { 7724bbb1faSMichael Holzheu while (hypfs_last_dentry) { 7824bbb1faSMichael Holzheu struct dentry *next_dentry; 7924bbb1faSMichael Holzheu next_dentry = hypfs_last_dentry->d_fsdata; 8024bbb1faSMichael Holzheu hypfs_remove(hypfs_last_dentry); 8124bbb1faSMichael Holzheu hypfs_last_dentry = next_dentry; 8224bbb1faSMichael Holzheu } 8324bbb1faSMichael Holzheu } 8424bbb1faSMichael Holzheu 8524bbb1faSMichael Holzheu static struct inode *hypfs_make_inode(struct super_block *sb, int mode) 8624bbb1faSMichael Holzheu { 8724bbb1faSMichael Holzheu struct inode *ret = new_inode(sb); 8824bbb1faSMichael Holzheu 8924bbb1faSMichael Holzheu if (ret) { 9024bbb1faSMichael Holzheu struct hypfs_sb_info *hypfs_info = sb->s_fs_info; 9124bbb1faSMichael Holzheu ret->i_mode = mode; 9224bbb1faSMichael Holzheu ret->i_uid = hypfs_info->uid; 9324bbb1faSMichael Holzheu ret->i_gid = hypfs_info->gid; 9424bbb1faSMichael Holzheu ret->i_blksize = PAGE_CACHE_SIZE; 9524bbb1faSMichael Holzheu ret->i_blocks = 0; 9624bbb1faSMichael Holzheu ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME; 9724bbb1faSMichael Holzheu if (mode & S_IFDIR) 9824bbb1faSMichael Holzheu ret->i_nlink = 2; 9924bbb1faSMichael Holzheu else 10024bbb1faSMichael Holzheu ret->i_nlink = 1; 10124bbb1faSMichael Holzheu } 10224bbb1faSMichael Holzheu return ret; 10324bbb1faSMichael Holzheu } 10424bbb1faSMichael Holzheu 10524bbb1faSMichael Holzheu static void hypfs_drop_inode(struct inode *inode) 10624bbb1faSMichael Holzheu { 10724bbb1faSMichael Holzheu kfree(inode->u.generic_ip); 10824bbb1faSMichael Holzheu generic_delete_inode(inode); 10924bbb1faSMichael Holzheu } 11024bbb1faSMichael Holzheu 11124bbb1faSMichael Holzheu static int hypfs_open(struct inode *inode, struct file *filp) 11224bbb1faSMichael Holzheu { 11324bbb1faSMichael Holzheu char *data = filp->f_dentry->d_inode->u.generic_ip; 11424bbb1faSMichael Holzheu struct hypfs_sb_info *fs_info; 11524bbb1faSMichael Holzheu 11624bbb1faSMichael Holzheu if (filp->f_mode & FMODE_WRITE) { 11724bbb1faSMichael Holzheu if (!(inode->i_mode & S_IWUGO)) 11824bbb1faSMichael Holzheu return -EACCES; 11924bbb1faSMichael Holzheu } 12024bbb1faSMichael Holzheu if (filp->f_mode & FMODE_READ) { 12124bbb1faSMichael Holzheu if (!(inode->i_mode & S_IRUGO)) 12224bbb1faSMichael Holzheu return -EACCES; 12324bbb1faSMichael Holzheu } 12424bbb1faSMichael Holzheu 12524bbb1faSMichael Holzheu fs_info = inode->i_sb->s_fs_info; 12624bbb1faSMichael Holzheu if(data) { 12724bbb1faSMichael Holzheu mutex_lock(&fs_info->lock); 12824bbb1faSMichael Holzheu filp->private_data = kstrdup(data, GFP_KERNEL); 12924bbb1faSMichael Holzheu if (!filp->private_data) { 13024bbb1faSMichael Holzheu mutex_unlock(&fs_info->lock); 13124bbb1faSMichael Holzheu return -ENOMEM; 13224bbb1faSMichael Holzheu } 13324bbb1faSMichael Holzheu mutex_unlock(&fs_info->lock); 13424bbb1faSMichael Holzheu } 13524bbb1faSMichael Holzheu return 0; 13624bbb1faSMichael Holzheu } 13724bbb1faSMichael Holzheu 13824bbb1faSMichael Holzheu static ssize_t hypfs_aio_read(struct kiocb *iocb, __user char *buf, 13924bbb1faSMichael Holzheu size_t count, loff_t offset) 14024bbb1faSMichael Holzheu { 14124bbb1faSMichael Holzheu char *data; 14224bbb1faSMichael Holzheu size_t len; 14324bbb1faSMichael Holzheu struct file *filp = iocb->ki_filp; 14424bbb1faSMichael Holzheu 14524bbb1faSMichael Holzheu data = filp->private_data; 14624bbb1faSMichael Holzheu len = strlen(data); 14724bbb1faSMichael Holzheu if (offset > len) { 14824bbb1faSMichael Holzheu count = 0; 14924bbb1faSMichael Holzheu goto out; 15024bbb1faSMichael Holzheu } 15124bbb1faSMichael Holzheu if (count > len - offset) 15224bbb1faSMichael Holzheu count = len - offset; 15324bbb1faSMichael Holzheu if (copy_to_user(buf, data + offset, count)) { 15424bbb1faSMichael Holzheu count = -EFAULT; 15524bbb1faSMichael Holzheu goto out; 15624bbb1faSMichael Holzheu } 15724bbb1faSMichael Holzheu iocb->ki_pos += count; 15824bbb1faSMichael Holzheu file_accessed(filp); 15924bbb1faSMichael Holzheu out: 16024bbb1faSMichael Holzheu return count; 16124bbb1faSMichael Holzheu } 16224bbb1faSMichael Holzheu static ssize_t hypfs_aio_write(struct kiocb *iocb, const char __user *buf, 16324bbb1faSMichael Holzheu size_t count, loff_t pos) 16424bbb1faSMichael Holzheu { 16524bbb1faSMichael Holzheu int rc; 16624bbb1faSMichael Holzheu struct super_block *sb; 16724bbb1faSMichael Holzheu struct hypfs_sb_info *fs_info; 16824bbb1faSMichael Holzheu 16924bbb1faSMichael Holzheu sb = iocb->ki_filp->f_dentry->d_inode->i_sb; 17024bbb1faSMichael Holzheu fs_info = sb->s_fs_info; 17124bbb1faSMichael Holzheu /* 17224bbb1faSMichael Holzheu * Currently we only allow one update per second for two reasons: 17324bbb1faSMichael Holzheu * 1. diag 204 is VERY expensive 17424bbb1faSMichael Holzheu * 2. If several processes do updates in parallel and then read the 17524bbb1faSMichael Holzheu * hypfs data, the likelihood of collisions is reduced, if we restrict 17624bbb1faSMichael Holzheu * the minimum update interval. A collision occurs, if during the 17724bbb1faSMichael Holzheu * data gathering of one process another process triggers an update 17824bbb1faSMichael Holzheu * If the first process wants to ensure consistent data, it has 17924bbb1faSMichael Holzheu * to restart data collection in this case. 18024bbb1faSMichael Holzheu */ 18124bbb1faSMichael Holzheu mutex_lock(&fs_info->lock); 18224bbb1faSMichael Holzheu if (fs_info->last_update == get_seconds()) { 18324bbb1faSMichael Holzheu rc = -EBUSY; 18424bbb1faSMichael Holzheu goto out; 18524bbb1faSMichael Holzheu } 18624bbb1faSMichael Holzheu hypfs_delete_tree(sb->s_root); 18724bbb1faSMichael Holzheu rc = hypfs_diag_create_files(sb, sb->s_root); 18824bbb1faSMichael Holzheu if (rc) { 18924bbb1faSMichael Holzheu printk(KERN_ERR "hypfs: Update failed\n"); 19024bbb1faSMichael Holzheu hypfs_delete_tree(sb->s_root); 19124bbb1faSMichael Holzheu goto out; 19224bbb1faSMichael Holzheu } 19324bbb1faSMichael Holzheu hypfs_update_update(sb); 19424bbb1faSMichael Holzheu rc = count; 19524bbb1faSMichael Holzheu out: 19624bbb1faSMichael Holzheu mutex_unlock(&fs_info->lock); 19724bbb1faSMichael Holzheu return rc; 19824bbb1faSMichael Holzheu } 19924bbb1faSMichael Holzheu 20024bbb1faSMichael Holzheu static int hypfs_release(struct inode *inode, struct file *filp) 20124bbb1faSMichael Holzheu { 20224bbb1faSMichael Holzheu kfree(filp->private_data); 20324bbb1faSMichael Holzheu return 0; 20424bbb1faSMichael Holzheu } 20524bbb1faSMichael Holzheu 20624bbb1faSMichael Holzheu enum { opt_uid, opt_gid, opt_err }; 20724bbb1faSMichael Holzheu 20824bbb1faSMichael Holzheu static match_table_t hypfs_tokens = { 20924bbb1faSMichael Holzheu {opt_uid, "uid=%u"}, 21024bbb1faSMichael Holzheu {opt_gid, "gid=%u"}, 21124bbb1faSMichael Holzheu {opt_err, NULL} 21224bbb1faSMichael Holzheu }; 21324bbb1faSMichael Holzheu 21424bbb1faSMichael Holzheu static int hypfs_parse_options(char *options, struct super_block *sb) 21524bbb1faSMichael Holzheu { 21624bbb1faSMichael Holzheu char *str; 21724bbb1faSMichael Holzheu substring_t args[MAX_OPT_ARGS]; 21824bbb1faSMichael Holzheu 21924bbb1faSMichael Holzheu if (!options) 22024bbb1faSMichael Holzheu return 0; 22124bbb1faSMichael Holzheu while ((str = strsep(&options, ",")) != NULL) { 22224bbb1faSMichael Holzheu int token, option; 22324bbb1faSMichael Holzheu struct hypfs_sb_info *hypfs_info = sb->s_fs_info; 22424bbb1faSMichael Holzheu 22524bbb1faSMichael Holzheu if (!*str) 22624bbb1faSMichael Holzheu continue; 22724bbb1faSMichael Holzheu token = match_token(str, hypfs_tokens, args); 22824bbb1faSMichael Holzheu switch (token) { 22924bbb1faSMichael Holzheu case opt_uid: 23024bbb1faSMichael Holzheu if (match_int(&args[0], &option)) 23124bbb1faSMichael Holzheu return -EINVAL; 23224bbb1faSMichael Holzheu hypfs_info->uid = option; 23324bbb1faSMichael Holzheu break; 23424bbb1faSMichael Holzheu case opt_gid: 23524bbb1faSMichael Holzheu if (match_int(&args[0], &option)) 23624bbb1faSMichael Holzheu return -EINVAL; 23724bbb1faSMichael Holzheu hypfs_info->gid = option; 23824bbb1faSMichael Holzheu break; 23924bbb1faSMichael Holzheu case opt_err: 24024bbb1faSMichael Holzheu default: 24124bbb1faSMichael Holzheu printk(KERN_ERR "hypfs: Unrecognized mount option " 24224bbb1faSMichael Holzheu "\"%s\" or missing value\n", str); 24324bbb1faSMichael Holzheu return -EINVAL; 24424bbb1faSMichael Holzheu } 24524bbb1faSMichael Holzheu } 24624bbb1faSMichael Holzheu return 0; 24724bbb1faSMichael Holzheu } 24824bbb1faSMichael Holzheu 24924bbb1faSMichael Holzheu static int hypfs_fill_super(struct super_block *sb, void *data, int silent) 25024bbb1faSMichael Holzheu { 25124bbb1faSMichael Holzheu struct inode *root_inode; 25224bbb1faSMichael Holzheu struct dentry *root_dentry; 25324bbb1faSMichael Holzheu int rc = 0; 25424bbb1faSMichael Holzheu struct hypfs_sb_info *sbi; 25524bbb1faSMichael Holzheu 25624bbb1faSMichael Holzheu sbi = kzalloc(sizeof(struct hypfs_sb_info), GFP_KERNEL); 25724bbb1faSMichael Holzheu if (!sbi) 25824bbb1faSMichael Holzheu return -ENOMEM; 25924bbb1faSMichael Holzheu mutex_init(&sbi->lock); 26024bbb1faSMichael Holzheu sbi->uid = current->uid; 26124bbb1faSMichael Holzheu sbi->gid = current->gid; 26224bbb1faSMichael Holzheu sb->s_fs_info = sbi; 26324bbb1faSMichael Holzheu sb->s_blocksize = PAGE_CACHE_SIZE; 26424bbb1faSMichael Holzheu sb->s_blocksize_bits = PAGE_CACHE_SHIFT; 26524bbb1faSMichael Holzheu sb->s_magic = HYPFS_MAGIC; 26624bbb1faSMichael Holzheu sb->s_op = &hypfs_s_ops; 26724bbb1faSMichael Holzheu if (hypfs_parse_options(data, sb)) { 26824bbb1faSMichael Holzheu rc = -EINVAL; 26924bbb1faSMichael Holzheu goto err_alloc; 27024bbb1faSMichael Holzheu } 27124bbb1faSMichael Holzheu root_inode = hypfs_make_inode(sb, S_IFDIR | 0755); 27224bbb1faSMichael Holzheu if (!root_inode) { 27324bbb1faSMichael Holzheu rc = -ENOMEM; 27424bbb1faSMichael Holzheu goto err_alloc; 27524bbb1faSMichael Holzheu } 27624bbb1faSMichael Holzheu root_inode->i_op = &simple_dir_inode_operations; 27724bbb1faSMichael Holzheu root_inode->i_fop = &simple_dir_operations; 27824bbb1faSMichael Holzheu root_dentry = d_alloc_root(root_inode); 27924bbb1faSMichael Holzheu if (!root_dentry) { 28024bbb1faSMichael Holzheu iput(root_inode); 28124bbb1faSMichael Holzheu rc = -ENOMEM; 28224bbb1faSMichael Holzheu goto err_alloc; 28324bbb1faSMichael Holzheu } 28424bbb1faSMichael Holzheu rc = hypfs_diag_create_files(sb, root_dentry); 28524bbb1faSMichael Holzheu if (rc) 28624bbb1faSMichael Holzheu goto err_tree; 28724bbb1faSMichael Holzheu sbi->update_file = hypfs_create_update_file(sb, root_dentry); 28824bbb1faSMichael Holzheu if (IS_ERR(sbi->update_file)) { 28924bbb1faSMichael Holzheu rc = PTR_ERR(sbi->update_file); 29024bbb1faSMichael Holzheu goto err_tree; 29124bbb1faSMichael Holzheu } 29224bbb1faSMichael Holzheu hypfs_update_update(sb); 29324bbb1faSMichael Holzheu sb->s_root = root_dentry; 29424bbb1faSMichael Holzheu return 0; 29524bbb1faSMichael Holzheu 29624bbb1faSMichael Holzheu err_tree: 29724bbb1faSMichael Holzheu hypfs_delete_tree(root_dentry); 29824bbb1faSMichael Holzheu d_genocide(root_dentry); 29924bbb1faSMichael Holzheu dput(root_dentry); 30024bbb1faSMichael Holzheu err_alloc: 30124bbb1faSMichael Holzheu kfree(sbi); 30224bbb1faSMichael Holzheu return rc; 30324bbb1faSMichael Holzheu } 30424bbb1faSMichael Holzheu 30524bbb1faSMichael Holzheu static struct super_block *hypfs_get_super(struct file_system_type *fst, 30624bbb1faSMichael Holzheu int flags, const char *devname, 30724bbb1faSMichael Holzheu void *data) 30824bbb1faSMichael Holzheu { 30924bbb1faSMichael Holzheu return get_sb_single(fst, flags, data, hypfs_fill_super); 31024bbb1faSMichael Holzheu } 31124bbb1faSMichael Holzheu 31224bbb1faSMichael Holzheu static void hypfs_kill_super(struct super_block *sb) 31324bbb1faSMichael Holzheu { 31424bbb1faSMichael Holzheu struct hypfs_sb_info *sb_info = sb->s_fs_info; 31524bbb1faSMichael Holzheu 31624bbb1faSMichael Holzheu hypfs_delete_tree(sb->s_root); 31724bbb1faSMichael Holzheu hypfs_remove(sb_info->update_file); 31824bbb1faSMichael Holzheu kfree(sb->s_fs_info); 31924bbb1faSMichael Holzheu sb->s_fs_info = NULL; 32024bbb1faSMichael Holzheu kill_litter_super(sb); 32124bbb1faSMichael Holzheu } 32224bbb1faSMichael Holzheu 32324bbb1faSMichael Holzheu static struct dentry *hypfs_create_file(struct super_block *sb, 32424bbb1faSMichael Holzheu struct dentry *parent, const char *name, 32524bbb1faSMichael Holzheu char *data, mode_t mode) 32624bbb1faSMichael Holzheu { 32724bbb1faSMichael Holzheu struct dentry *dentry; 32824bbb1faSMichael Holzheu struct inode *inode; 32924bbb1faSMichael Holzheu struct qstr qname; 33024bbb1faSMichael Holzheu 33124bbb1faSMichael Holzheu qname.name = name; 33224bbb1faSMichael Holzheu qname.len = strlen(name); 33324bbb1faSMichael Holzheu qname.hash = full_name_hash(name, qname.len); 33424bbb1faSMichael Holzheu dentry = lookup_one_len(name, parent, strlen(name)); 33524bbb1faSMichael Holzheu if (IS_ERR(dentry)) 33624bbb1faSMichael Holzheu return ERR_PTR(-ENOMEM); 33724bbb1faSMichael Holzheu inode = hypfs_make_inode(sb, mode); 33824bbb1faSMichael Holzheu if (!inode) { 33924bbb1faSMichael Holzheu dput(dentry); 34024bbb1faSMichael Holzheu return ERR_PTR(-ENOMEM); 34124bbb1faSMichael Holzheu } 34224bbb1faSMichael Holzheu if (mode & S_IFREG) { 34324bbb1faSMichael Holzheu inode->i_fop = &hypfs_file_ops; 34424bbb1faSMichael Holzheu if (data) 34524bbb1faSMichael Holzheu inode->i_size = strlen(data); 34624bbb1faSMichael Holzheu else 34724bbb1faSMichael Holzheu inode->i_size = 0; 34824bbb1faSMichael Holzheu } else if (mode & S_IFDIR) { 34924bbb1faSMichael Holzheu inode->i_op = &simple_dir_inode_operations; 35024bbb1faSMichael Holzheu inode->i_fop = &simple_dir_operations; 35124bbb1faSMichael Holzheu parent->d_inode->i_nlink++; 35224bbb1faSMichael Holzheu } else 35324bbb1faSMichael Holzheu BUG(); 35424bbb1faSMichael Holzheu inode->u.generic_ip = data; 35524bbb1faSMichael Holzheu d_instantiate(dentry, inode); 35624bbb1faSMichael Holzheu dget(dentry); 35724bbb1faSMichael Holzheu return dentry; 35824bbb1faSMichael Holzheu } 35924bbb1faSMichael Holzheu 36024bbb1faSMichael Holzheu struct dentry *hypfs_mkdir(struct super_block *sb, struct dentry *parent, 36124bbb1faSMichael Holzheu const char *name) 36224bbb1faSMichael Holzheu { 36324bbb1faSMichael Holzheu struct dentry *dentry; 36424bbb1faSMichael Holzheu 36524bbb1faSMichael Holzheu dentry = hypfs_create_file(sb, parent, name, NULL, S_IFDIR | DIR_MODE); 36624bbb1faSMichael Holzheu if (IS_ERR(dentry)) 36724bbb1faSMichael Holzheu return dentry; 36824bbb1faSMichael Holzheu hypfs_add_dentry(dentry); 36924bbb1faSMichael Holzheu parent->d_inode->i_nlink++; 37024bbb1faSMichael Holzheu return dentry; 37124bbb1faSMichael Holzheu } 37224bbb1faSMichael Holzheu 37324bbb1faSMichael Holzheu static struct dentry *hypfs_create_update_file(struct super_block *sb, 37424bbb1faSMichael Holzheu struct dentry *dir) 37524bbb1faSMichael Holzheu { 37624bbb1faSMichael Holzheu struct dentry *dentry; 37724bbb1faSMichael Holzheu 37824bbb1faSMichael Holzheu dentry = hypfs_create_file(sb, dir, "update", NULL, 37924bbb1faSMichael Holzheu S_IFREG | UPDATE_FILE_MODE); 38024bbb1faSMichael Holzheu /* 38124bbb1faSMichael Holzheu * We do not put the update file on the 'delete' list with 38224bbb1faSMichael Holzheu * hypfs_add_dentry(), since it should not be removed when the tree 38324bbb1faSMichael Holzheu * is updated. 38424bbb1faSMichael Holzheu */ 38524bbb1faSMichael Holzheu return dentry; 38624bbb1faSMichael Holzheu } 38724bbb1faSMichael Holzheu 38824bbb1faSMichael Holzheu struct dentry *hypfs_create_u64(struct super_block *sb, struct dentry *dir, 38924bbb1faSMichael Holzheu const char *name, __u64 value) 39024bbb1faSMichael Holzheu { 39124bbb1faSMichael Holzheu char *buffer; 39224bbb1faSMichael Holzheu char tmp[TMP_SIZE]; 39324bbb1faSMichael Holzheu struct dentry *dentry; 39424bbb1faSMichael Holzheu 39524bbb1faSMichael Holzheu snprintf(tmp, TMP_SIZE, "%lld\n", (unsigned long long int)value); 39624bbb1faSMichael Holzheu buffer = kstrdup(tmp, GFP_KERNEL); 39724bbb1faSMichael Holzheu if (!buffer) 39824bbb1faSMichael Holzheu return ERR_PTR(-ENOMEM); 39924bbb1faSMichael Holzheu dentry = 40024bbb1faSMichael Holzheu hypfs_create_file(sb, dir, name, buffer, S_IFREG | REG_FILE_MODE); 40124bbb1faSMichael Holzheu if (IS_ERR(dentry)) { 40224bbb1faSMichael Holzheu kfree(buffer); 40324bbb1faSMichael Holzheu return ERR_PTR(-ENOMEM); 40424bbb1faSMichael Holzheu } 40524bbb1faSMichael Holzheu hypfs_add_dentry(dentry); 40624bbb1faSMichael Holzheu return dentry; 40724bbb1faSMichael Holzheu } 40824bbb1faSMichael Holzheu 40924bbb1faSMichael Holzheu struct dentry *hypfs_create_str(struct super_block *sb, struct dentry *dir, 41024bbb1faSMichael Holzheu const char *name, char *string) 41124bbb1faSMichael Holzheu { 41224bbb1faSMichael Holzheu char *buffer; 41324bbb1faSMichael Holzheu struct dentry *dentry; 41424bbb1faSMichael Holzheu 41524bbb1faSMichael Holzheu buffer = kmalloc(strlen(string) + 2, GFP_KERNEL); 41624bbb1faSMichael Holzheu if (!buffer) 41724bbb1faSMichael Holzheu return ERR_PTR(-ENOMEM); 41824bbb1faSMichael Holzheu sprintf(buffer, "%s\n", string); 41924bbb1faSMichael Holzheu dentry = 42024bbb1faSMichael Holzheu hypfs_create_file(sb, dir, name, buffer, S_IFREG | REG_FILE_MODE); 42124bbb1faSMichael Holzheu if (IS_ERR(dentry)) { 42224bbb1faSMichael Holzheu kfree(buffer); 42324bbb1faSMichael Holzheu return ERR_PTR(-ENOMEM); 42424bbb1faSMichael Holzheu } 42524bbb1faSMichael Holzheu hypfs_add_dentry(dentry); 42624bbb1faSMichael Holzheu return dentry; 42724bbb1faSMichael Holzheu } 42824bbb1faSMichael Holzheu 42924bbb1faSMichael Holzheu static struct file_operations hypfs_file_ops = { 43024bbb1faSMichael Holzheu .open = hypfs_open, 43124bbb1faSMichael Holzheu .release = hypfs_release, 43224bbb1faSMichael Holzheu .read = do_sync_read, 43324bbb1faSMichael Holzheu .write = do_sync_write, 43424bbb1faSMichael Holzheu .aio_read = hypfs_aio_read, 43524bbb1faSMichael Holzheu .aio_write = hypfs_aio_write, 43624bbb1faSMichael Holzheu }; 43724bbb1faSMichael Holzheu 43824bbb1faSMichael Holzheu static struct file_system_type hypfs_type = { 43924bbb1faSMichael Holzheu .owner = THIS_MODULE, 44024bbb1faSMichael Holzheu .name = "s390_hypfs", 44124bbb1faSMichael Holzheu .get_sb = hypfs_get_super, 44224bbb1faSMichael Holzheu .kill_sb = hypfs_kill_super 44324bbb1faSMichael Holzheu }; 44424bbb1faSMichael Holzheu 44524bbb1faSMichael Holzheu static struct super_operations hypfs_s_ops = { 44624bbb1faSMichael Holzheu .statfs = simple_statfs, 44724bbb1faSMichael Holzheu .drop_inode = hypfs_drop_inode, 44824bbb1faSMichael Holzheu }; 44924bbb1faSMichael Holzheu 45024bbb1faSMichael Holzheu static decl_subsys(s390, NULL, NULL); 45124bbb1faSMichael Holzheu 45224bbb1faSMichael Holzheu static int __init hypfs_init(void) 45324bbb1faSMichael Holzheu { 45424bbb1faSMichael Holzheu int rc; 45524bbb1faSMichael Holzheu 45624bbb1faSMichael Holzheu if (MACHINE_IS_VM) 45724bbb1faSMichael Holzheu return -ENODATA; 45824bbb1faSMichael Holzheu if (hypfs_diag_init()) { 45924bbb1faSMichael Holzheu rc = -ENODATA; 46024bbb1faSMichael Holzheu goto fail_diag; 46124bbb1faSMichael Holzheu } 46224bbb1faSMichael Holzheu kset_set_kset_s(&s390_subsys, hypervisor_subsys); 46324bbb1faSMichael Holzheu rc = subsystem_register(&s390_subsys); 46424bbb1faSMichael Holzheu if (rc) 46524bbb1faSMichael Holzheu goto fail_sysfs; 46624bbb1faSMichael Holzheu rc = register_filesystem(&hypfs_type); 46724bbb1faSMichael Holzheu if (rc) 46824bbb1faSMichael Holzheu goto fail_filesystem; 46924bbb1faSMichael Holzheu return 0; 47024bbb1faSMichael Holzheu 47124bbb1faSMichael Holzheu fail_filesystem: 47224bbb1faSMichael Holzheu subsystem_unregister(&s390_subsys); 47324bbb1faSMichael Holzheu fail_sysfs: 47424bbb1faSMichael Holzheu hypfs_diag_exit(); 47524bbb1faSMichael Holzheu fail_diag: 47624bbb1faSMichael Holzheu printk(KERN_ERR "hypfs: Initialization failed with rc = %i.\n", rc); 47724bbb1faSMichael Holzheu return rc; 47824bbb1faSMichael Holzheu } 47924bbb1faSMichael Holzheu 48024bbb1faSMichael Holzheu static void __exit hypfs_exit(void) 48124bbb1faSMichael Holzheu { 48224bbb1faSMichael Holzheu hypfs_diag_exit(); 48324bbb1faSMichael Holzheu unregister_filesystem(&hypfs_type); 48424bbb1faSMichael Holzheu subsystem_unregister(&s390_subsys); 48524bbb1faSMichael Holzheu } 48624bbb1faSMichael Holzheu 48724bbb1faSMichael Holzheu module_init(hypfs_init) 48824bbb1faSMichael Holzheu module_exit(hypfs_exit) 48924bbb1faSMichael Holzheu 49024bbb1faSMichael Holzheu MODULE_LICENSE("GPL"); 49124bbb1faSMichael Holzheu MODULE_AUTHOR("Michael Holzheu <holzheu@de.ibm.com>"); 49224bbb1faSMichael Holzheu MODULE_DESCRIPTION("s390 Hypervisor Filesystem"); 493