124bbb1faSMichael Holzheu /* 2f19bfb2cSMichael Holzheu * arch/s390/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> 20b01af5baSMichael Holzheu #include <linux/seq_file.h> 21b01af5baSMichael Holzheu #include <linux/mount.h> 2224bbb1faSMichael Holzheu #include <asm/ebcdic.h> 2324bbb1faSMichael Holzheu #include "hypfs.h" 2424bbb1faSMichael Holzheu 2524bbb1faSMichael Holzheu #define HYPFS_MAGIC 0x687970 /* ASCII 'hyp' */ 2624bbb1faSMichael Holzheu #define TMP_SIZE 64 /* size of temporary buffers */ 2724bbb1faSMichael Holzheu 2824bbb1faSMichael Holzheu static struct dentry *hypfs_create_update_file(struct super_block *sb, 2924bbb1faSMichael Holzheu struct dentry *dir); 3024bbb1faSMichael Holzheu 3124bbb1faSMichael Holzheu struct hypfs_sb_info { 3224bbb1faSMichael Holzheu uid_t uid; /* uid used for files and dirs */ 3324bbb1faSMichael Holzheu gid_t gid; /* gid used for files and dirs */ 3424bbb1faSMichael Holzheu struct dentry *update_file; /* file to trigger update */ 3524bbb1faSMichael Holzheu time_t last_update; /* last update time in secs since 1970 */ 3624bbb1faSMichael Holzheu struct mutex lock; /* lock to protect update process */ 3724bbb1faSMichael Holzheu }; 3824bbb1faSMichael Holzheu 395dfe4c96SArjan van de Ven static const struct file_operations hypfs_file_ops; 4024bbb1faSMichael Holzheu static struct file_system_type hypfs_type; 4124bbb1faSMichael Holzheu static struct super_operations hypfs_s_ops; 4224bbb1faSMichael Holzheu 4324bbb1faSMichael Holzheu /* start of list of all dentries, which have to be deleted on update */ 4424bbb1faSMichael Holzheu static struct dentry *hypfs_last_dentry; 4524bbb1faSMichael Holzheu 4624bbb1faSMichael Holzheu static void hypfs_update_update(struct super_block *sb) 4724bbb1faSMichael Holzheu { 4824bbb1faSMichael Holzheu struct hypfs_sb_info *sb_info = sb->s_fs_info; 4924bbb1faSMichael Holzheu struct inode *inode = sb_info->update_file->d_inode; 5024bbb1faSMichael Holzheu 5124bbb1faSMichael Holzheu sb_info->last_update = get_seconds(); 5224bbb1faSMichael Holzheu inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 5324bbb1faSMichael Holzheu } 5424bbb1faSMichael Holzheu 5524bbb1faSMichael Holzheu /* directory tree removal functions */ 5624bbb1faSMichael Holzheu 5724bbb1faSMichael Holzheu static void hypfs_add_dentry(struct dentry *dentry) 5824bbb1faSMichael Holzheu { 5924bbb1faSMichael Holzheu dentry->d_fsdata = hypfs_last_dentry; 6024bbb1faSMichael Holzheu hypfs_last_dentry = dentry; 6124bbb1faSMichael Holzheu } 6224bbb1faSMichael Holzheu 639b5a03e1SMichael Holzheu static inline int hypfs_positive(struct dentry *dentry) 649b5a03e1SMichael Holzheu { 659b5a03e1SMichael Holzheu return dentry->d_inode && !d_unhashed(dentry); 669b5a03e1SMichael Holzheu } 679b5a03e1SMichael Holzheu 6824bbb1faSMichael Holzheu static void hypfs_remove(struct dentry *dentry) 6924bbb1faSMichael Holzheu { 7024bbb1faSMichael Holzheu struct dentry *parent; 7124bbb1faSMichael Holzheu 7224bbb1faSMichael Holzheu parent = dentry->d_parent; 739b5a03e1SMichael Holzheu if (!parent || !parent->d_inode) 749b5a03e1SMichael Holzheu return; 759b5a03e1SMichael Holzheu mutex_lock(&parent->d_inode->i_mutex); 769b5a03e1SMichael Holzheu if (hypfs_positive(dentry)) { 7724bbb1faSMichael Holzheu if (S_ISDIR(dentry->d_inode->i_mode)) 7824bbb1faSMichael Holzheu simple_rmdir(parent->d_inode, dentry); 7924bbb1faSMichael Holzheu else 8024bbb1faSMichael Holzheu simple_unlink(parent->d_inode, dentry); 819b5a03e1SMichael Holzheu } 8224bbb1faSMichael Holzheu d_delete(dentry); 8324bbb1faSMichael Holzheu dput(dentry); 849b5a03e1SMichael Holzheu mutex_unlock(&parent->d_inode->i_mutex); 8524bbb1faSMichael Holzheu } 8624bbb1faSMichael Holzheu 8724bbb1faSMichael Holzheu static void hypfs_delete_tree(struct dentry *root) 8824bbb1faSMichael Holzheu { 8924bbb1faSMichael Holzheu while (hypfs_last_dentry) { 9024bbb1faSMichael Holzheu struct dentry *next_dentry; 9124bbb1faSMichael Holzheu next_dentry = hypfs_last_dentry->d_fsdata; 9224bbb1faSMichael Holzheu hypfs_remove(hypfs_last_dentry); 9324bbb1faSMichael Holzheu hypfs_last_dentry = next_dentry; 9424bbb1faSMichael Holzheu } 9524bbb1faSMichael Holzheu } 9624bbb1faSMichael Holzheu 9724bbb1faSMichael Holzheu static struct inode *hypfs_make_inode(struct super_block *sb, int mode) 9824bbb1faSMichael Holzheu { 9924bbb1faSMichael Holzheu struct inode *ret = new_inode(sb); 10024bbb1faSMichael Holzheu 10124bbb1faSMichael Holzheu if (ret) { 10224bbb1faSMichael Holzheu struct hypfs_sb_info *hypfs_info = sb->s_fs_info; 10324bbb1faSMichael Holzheu ret->i_mode = mode; 10424bbb1faSMichael Holzheu ret->i_uid = hypfs_info->uid; 10524bbb1faSMichael Holzheu ret->i_gid = hypfs_info->gid; 10624bbb1faSMichael Holzheu ret->i_blocks = 0; 10724bbb1faSMichael Holzheu ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME; 10824bbb1faSMichael Holzheu if (mode & S_IFDIR) 10924bbb1faSMichael Holzheu ret->i_nlink = 2; 11024bbb1faSMichael Holzheu else 11124bbb1faSMichael Holzheu ret->i_nlink = 1; 11224bbb1faSMichael Holzheu } 11324bbb1faSMichael Holzheu return ret; 11424bbb1faSMichael Holzheu } 11524bbb1faSMichael Holzheu 11624bbb1faSMichael Holzheu static void hypfs_drop_inode(struct inode *inode) 11724bbb1faSMichael Holzheu { 1188e18e294STheodore Ts'o kfree(inode->i_private); 11924bbb1faSMichael Holzheu generic_delete_inode(inode); 12024bbb1faSMichael Holzheu } 12124bbb1faSMichael Holzheu 12224bbb1faSMichael Holzheu static int hypfs_open(struct inode *inode, struct file *filp) 12324bbb1faSMichael Holzheu { 124d20343e7SJosef Sipek char *data = filp->f_path.dentry->d_inode->i_private; 12524bbb1faSMichael Holzheu struct hypfs_sb_info *fs_info; 12624bbb1faSMichael Holzheu 12724bbb1faSMichael Holzheu if (filp->f_mode & FMODE_WRITE) { 12824bbb1faSMichael Holzheu if (!(inode->i_mode & S_IWUGO)) 12924bbb1faSMichael Holzheu return -EACCES; 13024bbb1faSMichael Holzheu } 13124bbb1faSMichael Holzheu if (filp->f_mode & FMODE_READ) { 13224bbb1faSMichael Holzheu if (!(inode->i_mode & S_IRUGO)) 13324bbb1faSMichael Holzheu return -EACCES; 13424bbb1faSMichael Holzheu } 13524bbb1faSMichael Holzheu 13624bbb1faSMichael Holzheu fs_info = inode->i_sb->s_fs_info; 13724bbb1faSMichael Holzheu if(data) { 13824bbb1faSMichael Holzheu mutex_lock(&fs_info->lock); 13924bbb1faSMichael Holzheu filp->private_data = kstrdup(data, GFP_KERNEL); 14024bbb1faSMichael Holzheu if (!filp->private_data) { 14124bbb1faSMichael Holzheu mutex_unlock(&fs_info->lock); 14224bbb1faSMichael Holzheu return -ENOMEM; 14324bbb1faSMichael Holzheu } 14424bbb1faSMichael Holzheu mutex_unlock(&fs_info->lock); 14524bbb1faSMichael Holzheu } 14624bbb1faSMichael Holzheu return 0; 14724bbb1faSMichael Holzheu } 14824bbb1faSMichael Holzheu 149027445c3SBadari Pulavarty static ssize_t hypfs_aio_read(struct kiocb *iocb, const struct iovec *iov, 150027445c3SBadari Pulavarty unsigned long nr_segs, loff_t offset) 15124bbb1faSMichael Holzheu { 15224bbb1faSMichael Holzheu char *data; 15324bbb1faSMichael Holzheu size_t len; 15424bbb1faSMichael Holzheu struct file *filp = iocb->ki_filp; 155027445c3SBadari Pulavarty /* XXX: temporary */ 156027445c3SBadari Pulavarty char __user *buf = iov[0].iov_base; 157027445c3SBadari Pulavarty size_t count = iov[0].iov_len; 158027445c3SBadari Pulavarty 159027445c3SBadari Pulavarty if (nr_segs != 1) { 160027445c3SBadari Pulavarty count = -EINVAL; 161027445c3SBadari Pulavarty goto out; 162027445c3SBadari Pulavarty } 16324bbb1faSMichael Holzheu 16424bbb1faSMichael Holzheu data = filp->private_data; 16524bbb1faSMichael Holzheu len = strlen(data); 16624bbb1faSMichael Holzheu if (offset > len) { 16724bbb1faSMichael Holzheu count = 0; 16824bbb1faSMichael Holzheu goto out; 16924bbb1faSMichael Holzheu } 17024bbb1faSMichael Holzheu if (count > len - offset) 17124bbb1faSMichael Holzheu count = len - offset; 17224bbb1faSMichael Holzheu if (copy_to_user(buf, data + offset, count)) { 17324bbb1faSMichael Holzheu count = -EFAULT; 17424bbb1faSMichael Holzheu goto out; 17524bbb1faSMichael Holzheu } 17624bbb1faSMichael Holzheu iocb->ki_pos += count; 17724bbb1faSMichael Holzheu file_accessed(filp); 17824bbb1faSMichael Holzheu out: 17924bbb1faSMichael Holzheu return count; 18024bbb1faSMichael Holzheu } 181027445c3SBadari Pulavarty static ssize_t hypfs_aio_write(struct kiocb *iocb, const struct iovec *iov, 182027445c3SBadari Pulavarty unsigned long nr_segs, loff_t offset) 18324bbb1faSMichael Holzheu { 18424bbb1faSMichael Holzheu int rc; 18524bbb1faSMichael Holzheu struct super_block *sb; 18624bbb1faSMichael Holzheu struct hypfs_sb_info *fs_info; 187027445c3SBadari Pulavarty size_t count = iov_length(iov, nr_segs); 18824bbb1faSMichael Holzheu 189d20343e7SJosef Sipek sb = iocb->ki_filp->f_path.dentry->d_inode->i_sb; 19024bbb1faSMichael Holzheu fs_info = sb->s_fs_info; 19124bbb1faSMichael Holzheu /* 19224bbb1faSMichael Holzheu * Currently we only allow one update per second for two reasons: 19324bbb1faSMichael Holzheu * 1. diag 204 is VERY expensive 19424bbb1faSMichael Holzheu * 2. If several processes do updates in parallel and then read the 19524bbb1faSMichael Holzheu * hypfs data, the likelihood of collisions is reduced, if we restrict 19624bbb1faSMichael Holzheu * the minimum update interval. A collision occurs, if during the 19724bbb1faSMichael Holzheu * data gathering of one process another process triggers an update 19824bbb1faSMichael Holzheu * If the first process wants to ensure consistent data, it has 19924bbb1faSMichael Holzheu * to restart data collection in this case. 20024bbb1faSMichael Holzheu */ 20124bbb1faSMichael Holzheu mutex_lock(&fs_info->lock); 20224bbb1faSMichael Holzheu if (fs_info->last_update == get_seconds()) { 20324bbb1faSMichael Holzheu rc = -EBUSY; 20424bbb1faSMichael Holzheu goto out; 20524bbb1faSMichael Holzheu } 20624bbb1faSMichael Holzheu hypfs_delete_tree(sb->s_root); 20731cb4bd3SMichael Holzheu if (MACHINE_IS_VM) 20831cb4bd3SMichael Holzheu rc = hypfs_vm_create_files(sb, sb->s_root); 20931cb4bd3SMichael Holzheu else 21024bbb1faSMichael Holzheu rc = hypfs_diag_create_files(sb, sb->s_root); 21124bbb1faSMichael Holzheu if (rc) { 21224bbb1faSMichael Holzheu printk(KERN_ERR "hypfs: Update failed\n"); 21324bbb1faSMichael Holzheu hypfs_delete_tree(sb->s_root); 21424bbb1faSMichael Holzheu goto out; 21524bbb1faSMichael Holzheu } 21624bbb1faSMichael Holzheu hypfs_update_update(sb); 21724bbb1faSMichael Holzheu rc = count; 21824bbb1faSMichael Holzheu out: 21924bbb1faSMichael Holzheu mutex_unlock(&fs_info->lock); 22024bbb1faSMichael Holzheu return rc; 22124bbb1faSMichael Holzheu } 22224bbb1faSMichael Holzheu 22324bbb1faSMichael Holzheu static int hypfs_release(struct inode *inode, struct file *filp) 22424bbb1faSMichael Holzheu { 22524bbb1faSMichael Holzheu kfree(filp->private_data); 22624bbb1faSMichael Holzheu return 0; 22724bbb1faSMichael Holzheu } 22824bbb1faSMichael Holzheu 22924bbb1faSMichael Holzheu enum { opt_uid, opt_gid, opt_err }; 23024bbb1faSMichael Holzheu 23124bbb1faSMichael Holzheu static match_table_t hypfs_tokens = { 23224bbb1faSMichael Holzheu {opt_uid, "uid=%u"}, 23324bbb1faSMichael Holzheu {opt_gid, "gid=%u"}, 23424bbb1faSMichael Holzheu {opt_err, NULL} 23524bbb1faSMichael Holzheu }; 23624bbb1faSMichael Holzheu 23724bbb1faSMichael Holzheu static int hypfs_parse_options(char *options, struct super_block *sb) 23824bbb1faSMichael Holzheu { 23924bbb1faSMichael Holzheu char *str; 24024bbb1faSMichael Holzheu substring_t args[MAX_OPT_ARGS]; 24124bbb1faSMichael Holzheu 24224bbb1faSMichael Holzheu if (!options) 24324bbb1faSMichael Holzheu return 0; 24424bbb1faSMichael Holzheu while ((str = strsep(&options, ",")) != NULL) { 24524bbb1faSMichael Holzheu int token, option; 24624bbb1faSMichael Holzheu struct hypfs_sb_info *hypfs_info = sb->s_fs_info; 24724bbb1faSMichael Holzheu 24824bbb1faSMichael Holzheu if (!*str) 24924bbb1faSMichael Holzheu continue; 25024bbb1faSMichael Holzheu token = match_token(str, hypfs_tokens, args); 25124bbb1faSMichael Holzheu switch (token) { 25224bbb1faSMichael Holzheu case opt_uid: 25324bbb1faSMichael Holzheu if (match_int(&args[0], &option)) 25424bbb1faSMichael Holzheu return -EINVAL; 25524bbb1faSMichael Holzheu hypfs_info->uid = option; 25624bbb1faSMichael Holzheu break; 25724bbb1faSMichael Holzheu case opt_gid: 25824bbb1faSMichael Holzheu if (match_int(&args[0], &option)) 25924bbb1faSMichael Holzheu return -EINVAL; 26024bbb1faSMichael Holzheu hypfs_info->gid = option; 26124bbb1faSMichael Holzheu break; 26224bbb1faSMichael Holzheu case opt_err: 26324bbb1faSMichael Holzheu default: 26424bbb1faSMichael Holzheu printk(KERN_ERR "hypfs: Unrecognized mount option " 26524bbb1faSMichael Holzheu "\"%s\" or missing value\n", str); 26624bbb1faSMichael Holzheu return -EINVAL; 26724bbb1faSMichael Holzheu } 26824bbb1faSMichael Holzheu } 26924bbb1faSMichael Holzheu return 0; 27024bbb1faSMichael Holzheu } 27124bbb1faSMichael Holzheu 272b01af5baSMichael Holzheu static int hypfs_show_options(struct seq_file *s, struct vfsmount *mnt) 273b01af5baSMichael Holzheu { 274b01af5baSMichael Holzheu struct hypfs_sb_info *hypfs_info = mnt->mnt_sb->s_fs_info; 275b01af5baSMichael Holzheu 276b01af5baSMichael Holzheu seq_printf(s, ",uid=%u", hypfs_info->uid); 277b01af5baSMichael Holzheu seq_printf(s, ",gid=%u", hypfs_info->gid); 278b01af5baSMichael Holzheu return 0; 279b01af5baSMichael Holzheu } 280b01af5baSMichael Holzheu 28124bbb1faSMichael Holzheu static int hypfs_fill_super(struct super_block *sb, void *data, int silent) 28224bbb1faSMichael Holzheu { 28324bbb1faSMichael Holzheu struct inode *root_inode; 28424bbb1faSMichael Holzheu struct dentry *root_dentry; 28524bbb1faSMichael Holzheu int rc = 0; 28624bbb1faSMichael Holzheu struct hypfs_sb_info *sbi; 28724bbb1faSMichael Holzheu 28824bbb1faSMichael Holzheu sbi = kzalloc(sizeof(struct hypfs_sb_info), GFP_KERNEL); 28924bbb1faSMichael Holzheu if (!sbi) 29024bbb1faSMichael Holzheu return -ENOMEM; 29124bbb1faSMichael Holzheu mutex_init(&sbi->lock); 29224bbb1faSMichael Holzheu sbi->uid = current->uid; 29324bbb1faSMichael Holzheu sbi->gid = current->gid; 29424bbb1faSMichael Holzheu sb->s_fs_info = sbi; 29524bbb1faSMichael Holzheu sb->s_blocksize = PAGE_CACHE_SIZE; 29624bbb1faSMichael Holzheu sb->s_blocksize_bits = PAGE_CACHE_SHIFT; 29724bbb1faSMichael Holzheu sb->s_magic = HYPFS_MAGIC; 29824bbb1faSMichael Holzheu sb->s_op = &hypfs_s_ops; 29924bbb1faSMichael Holzheu if (hypfs_parse_options(data, sb)) { 30024bbb1faSMichael Holzheu rc = -EINVAL; 30124bbb1faSMichael Holzheu goto err_alloc; 30224bbb1faSMichael Holzheu } 30324bbb1faSMichael Holzheu root_inode = hypfs_make_inode(sb, S_IFDIR | 0755); 30424bbb1faSMichael Holzheu if (!root_inode) { 30524bbb1faSMichael Holzheu rc = -ENOMEM; 30624bbb1faSMichael Holzheu goto err_alloc; 30724bbb1faSMichael Holzheu } 30824bbb1faSMichael Holzheu root_inode->i_op = &simple_dir_inode_operations; 30924bbb1faSMichael Holzheu root_inode->i_fop = &simple_dir_operations; 31024bbb1faSMichael Holzheu root_dentry = d_alloc_root(root_inode); 31124bbb1faSMichael Holzheu if (!root_dentry) { 31224bbb1faSMichael Holzheu iput(root_inode); 31324bbb1faSMichael Holzheu rc = -ENOMEM; 31424bbb1faSMichael Holzheu goto err_alloc; 31524bbb1faSMichael Holzheu } 31631cb4bd3SMichael Holzheu if (MACHINE_IS_VM) 31731cb4bd3SMichael Holzheu rc = hypfs_vm_create_files(sb, root_dentry); 31831cb4bd3SMichael Holzheu else 31924bbb1faSMichael Holzheu rc = hypfs_diag_create_files(sb, root_dentry); 32024bbb1faSMichael Holzheu if (rc) 32124bbb1faSMichael Holzheu goto err_tree; 32224bbb1faSMichael Holzheu sbi->update_file = hypfs_create_update_file(sb, root_dentry); 32324bbb1faSMichael Holzheu if (IS_ERR(sbi->update_file)) { 32424bbb1faSMichael Holzheu rc = PTR_ERR(sbi->update_file); 32524bbb1faSMichael Holzheu goto err_tree; 32624bbb1faSMichael Holzheu } 32724bbb1faSMichael Holzheu hypfs_update_update(sb); 32824bbb1faSMichael Holzheu sb->s_root = root_dentry; 3299b5a03e1SMichael Holzheu printk(KERN_INFO "hypfs: Hypervisor filesystem mounted\n"); 33024bbb1faSMichael Holzheu return 0; 33124bbb1faSMichael Holzheu 33224bbb1faSMichael Holzheu err_tree: 33324bbb1faSMichael Holzheu hypfs_delete_tree(root_dentry); 33424bbb1faSMichael Holzheu d_genocide(root_dentry); 33524bbb1faSMichael Holzheu dput(root_dentry); 33624bbb1faSMichael Holzheu err_alloc: 33724bbb1faSMichael Holzheu kfree(sbi); 33824bbb1faSMichael Holzheu return rc; 33924bbb1faSMichael Holzheu } 34024bbb1faSMichael Holzheu 341a5cf4b9aSAndrew Morton static int hypfs_get_super(struct file_system_type *fst, int flags, 342a5cf4b9aSAndrew Morton const char *devname, void *data, struct vfsmount *mnt) 34324bbb1faSMichael Holzheu { 344a5cf4b9aSAndrew Morton return get_sb_single(fst, flags, data, hypfs_fill_super, mnt); 34524bbb1faSMichael Holzheu } 34624bbb1faSMichael Holzheu 34724bbb1faSMichael Holzheu static void hypfs_kill_super(struct super_block *sb) 34824bbb1faSMichael Holzheu { 34924bbb1faSMichael Holzheu struct hypfs_sb_info *sb_info = sb->s_fs_info; 35024bbb1faSMichael Holzheu 351388c571cSMichael Holzheu if (sb->s_root) { 35224bbb1faSMichael Holzheu hypfs_delete_tree(sb->s_root); 35324bbb1faSMichael Holzheu hypfs_remove(sb_info->update_file); 35424bbb1faSMichael Holzheu kfree(sb->s_fs_info); 35524bbb1faSMichael Holzheu sb->s_fs_info = NULL; 356388c571cSMichael Holzheu } 35724bbb1faSMichael Holzheu kill_litter_super(sb); 35824bbb1faSMichael Holzheu } 35924bbb1faSMichael Holzheu 36024bbb1faSMichael Holzheu static struct dentry *hypfs_create_file(struct super_block *sb, 36124bbb1faSMichael Holzheu struct dentry *parent, const char *name, 36224bbb1faSMichael Holzheu char *data, mode_t mode) 36324bbb1faSMichael Holzheu { 36424bbb1faSMichael Holzheu struct dentry *dentry; 36524bbb1faSMichael Holzheu struct inode *inode; 36624bbb1faSMichael Holzheu struct qstr qname; 36724bbb1faSMichael Holzheu 36824bbb1faSMichael Holzheu qname.name = name; 36924bbb1faSMichael Holzheu qname.len = strlen(name); 37024bbb1faSMichael Holzheu qname.hash = full_name_hash(name, qname.len); 3719b5a03e1SMichael Holzheu mutex_lock(&parent->d_inode->i_mutex); 37224bbb1faSMichael Holzheu dentry = lookup_one_len(name, parent, strlen(name)); 3739b5a03e1SMichael Holzheu if (IS_ERR(dentry)) { 3749b5a03e1SMichael Holzheu dentry = ERR_PTR(-ENOMEM); 3759b5a03e1SMichael Holzheu goto fail; 3769b5a03e1SMichael Holzheu } 37724bbb1faSMichael Holzheu inode = hypfs_make_inode(sb, mode); 37824bbb1faSMichael Holzheu if (!inode) { 37924bbb1faSMichael Holzheu dput(dentry); 3809b5a03e1SMichael Holzheu dentry = ERR_PTR(-ENOMEM); 3819b5a03e1SMichael Holzheu goto fail; 38224bbb1faSMichael Holzheu } 38324bbb1faSMichael Holzheu if (mode & S_IFREG) { 38424bbb1faSMichael Holzheu inode->i_fop = &hypfs_file_ops; 38524bbb1faSMichael Holzheu if (data) 38624bbb1faSMichael Holzheu inode->i_size = strlen(data); 38724bbb1faSMichael Holzheu else 38824bbb1faSMichael Holzheu inode->i_size = 0; 38924bbb1faSMichael Holzheu } else if (mode & S_IFDIR) { 39024bbb1faSMichael Holzheu inode->i_op = &simple_dir_inode_operations; 39124bbb1faSMichael Holzheu inode->i_fop = &simple_dir_operations; 39224bbb1faSMichael Holzheu parent->d_inode->i_nlink++; 39324bbb1faSMichael Holzheu } else 39424bbb1faSMichael Holzheu BUG(); 3958e18e294STheodore Ts'o inode->i_private = data; 39624bbb1faSMichael Holzheu d_instantiate(dentry, inode); 39724bbb1faSMichael Holzheu dget(dentry); 3989b5a03e1SMichael Holzheu fail: 3999b5a03e1SMichael Holzheu mutex_unlock(&parent->d_inode->i_mutex); 40024bbb1faSMichael Holzheu return dentry; 40124bbb1faSMichael Holzheu } 40224bbb1faSMichael Holzheu 40324bbb1faSMichael Holzheu struct dentry *hypfs_mkdir(struct super_block *sb, struct dentry *parent, 40424bbb1faSMichael Holzheu const char *name) 40524bbb1faSMichael Holzheu { 40624bbb1faSMichael Holzheu struct dentry *dentry; 40724bbb1faSMichael Holzheu 40824bbb1faSMichael Holzheu dentry = hypfs_create_file(sb, parent, name, NULL, S_IFDIR | DIR_MODE); 40924bbb1faSMichael Holzheu if (IS_ERR(dentry)) 41024bbb1faSMichael Holzheu return dentry; 41124bbb1faSMichael Holzheu hypfs_add_dentry(dentry); 41224bbb1faSMichael Holzheu return dentry; 41324bbb1faSMichael Holzheu } 41424bbb1faSMichael Holzheu 41524bbb1faSMichael Holzheu static struct dentry *hypfs_create_update_file(struct super_block *sb, 41624bbb1faSMichael Holzheu struct dentry *dir) 41724bbb1faSMichael Holzheu { 41824bbb1faSMichael Holzheu struct dentry *dentry; 41924bbb1faSMichael Holzheu 42024bbb1faSMichael Holzheu dentry = hypfs_create_file(sb, dir, "update", NULL, 42124bbb1faSMichael Holzheu S_IFREG | UPDATE_FILE_MODE); 42224bbb1faSMichael Holzheu /* 42324bbb1faSMichael Holzheu * We do not put the update file on the 'delete' list with 42424bbb1faSMichael Holzheu * hypfs_add_dentry(), since it should not be removed when the tree 42524bbb1faSMichael Holzheu * is updated. 42624bbb1faSMichael Holzheu */ 42724bbb1faSMichael Holzheu return dentry; 42824bbb1faSMichael Holzheu } 42924bbb1faSMichael Holzheu 43024bbb1faSMichael Holzheu struct dentry *hypfs_create_u64(struct super_block *sb, struct dentry *dir, 43124bbb1faSMichael Holzheu const char *name, __u64 value) 43224bbb1faSMichael Holzheu { 43324bbb1faSMichael Holzheu char *buffer; 43424bbb1faSMichael Holzheu char tmp[TMP_SIZE]; 43524bbb1faSMichael Holzheu struct dentry *dentry; 43624bbb1faSMichael Holzheu 43724bbb1faSMichael Holzheu snprintf(tmp, TMP_SIZE, "%lld\n", (unsigned long long int)value); 43824bbb1faSMichael Holzheu buffer = kstrdup(tmp, GFP_KERNEL); 43924bbb1faSMichael Holzheu if (!buffer) 44024bbb1faSMichael Holzheu return ERR_PTR(-ENOMEM); 44124bbb1faSMichael Holzheu dentry = 44224bbb1faSMichael Holzheu hypfs_create_file(sb, dir, name, buffer, S_IFREG | REG_FILE_MODE); 44324bbb1faSMichael Holzheu if (IS_ERR(dentry)) { 44424bbb1faSMichael Holzheu kfree(buffer); 44524bbb1faSMichael Holzheu return ERR_PTR(-ENOMEM); 44624bbb1faSMichael Holzheu } 44724bbb1faSMichael Holzheu hypfs_add_dentry(dentry); 44824bbb1faSMichael Holzheu return dentry; 44924bbb1faSMichael Holzheu } 45024bbb1faSMichael Holzheu 45124bbb1faSMichael Holzheu struct dentry *hypfs_create_str(struct super_block *sb, struct dentry *dir, 45224bbb1faSMichael Holzheu const char *name, char *string) 45324bbb1faSMichael Holzheu { 45424bbb1faSMichael Holzheu char *buffer; 45524bbb1faSMichael Holzheu struct dentry *dentry; 45624bbb1faSMichael Holzheu 45724bbb1faSMichael Holzheu buffer = kmalloc(strlen(string) + 2, GFP_KERNEL); 45824bbb1faSMichael Holzheu if (!buffer) 45924bbb1faSMichael Holzheu return ERR_PTR(-ENOMEM); 46024bbb1faSMichael Holzheu sprintf(buffer, "%s\n", string); 46124bbb1faSMichael Holzheu dentry = 46224bbb1faSMichael Holzheu hypfs_create_file(sb, dir, name, buffer, S_IFREG | REG_FILE_MODE); 46324bbb1faSMichael Holzheu if (IS_ERR(dentry)) { 46424bbb1faSMichael Holzheu kfree(buffer); 46524bbb1faSMichael Holzheu return ERR_PTR(-ENOMEM); 46624bbb1faSMichael Holzheu } 46724bbb1faSMichael Holzheu hypfs_add_dentry(dentry); 46824bbb1faSMichael Holzheu return dentry; 46924bbb1faSMichael Holzheu } 47024bbb1faSMichael Holzheu 4715dfe4c96SArjan van de Ven static const struct file_operations hypfs_file_ops = { 47224bbb1faSMichael Holzheu .open = hypfs_open, 47324bbb1faSMichael Holzheu .release = hypfs_release, 47424bbb1faSMichael Holzheu .read = do_sync_read, 47524bbb1faSMichael Holzheu .write = do_sync_write, 47624bbb1faSMichael Holzheu .aio_read = hypfs_aio_read, 47724bbb1faSMichael Holzheu .aio_write = hypfs_aio_write, 47824bbb1faSMichael Holzheu }; 47924bbb1faSMichael Holzheu 48024bbb1faSMichael Holzheu static struct file_system_type hypfs_type = { 48124bbb1faSMichael Holzheu .owner = THIS_MODULE, 48224bbb1faSMichael Holzheu .name = "s390_hypfs", 48324bbb1faSMichael Holzheu .get_sb = hypfs_get_super, 48424bbb1faSMichael Holzheu .kill_sb = hypfs_kill_super 48524bbb1faSMichael Holzheu }; 48624bbb1faSMichael Holzheu 48724bbb1faSMichael Holzheu static struct super_operations hypfs_s_ops = { 48824bbb1faSMichael Holzheu .statfs = simple_statfs, 48924bbb1faSMichael Holzheu .drop_inode = hypfs_drop_inode, 490b01af5baSMichael Holzheu .show_options = hypfs_show_options, 49124bbb1faSMichael Holzheu }; 49224bbb1faSMichael Holzheu 4939b477705SGreg Kroah-Hartman static struct kobject *s390_kobj; 49424bbb1faSMichael Holzheu 49524bbb1faSMichael Holzheu static int __init hypfs_init(void) 49624bbb1faSMichael Holzheu { 49724bbb1faSMichael Holzheu int rc; 49824bbb1faSMichael Holzheu 49931cb4bd3SMichael Holzheu if (MACHINE_IS_VM) { 50031cb4bd3SMichael Holzheu if (hypfs_vm_init()) 50131cb4bd3SMichael Holzheu /* no diag 2fc, just exit */ 50224bbb1faSMichael Holzheu return -ENODATA; 50331cb4bd3SMichael Holzheu } else { 50424bbb1faSMichael Holzheu if (hypfs_diag_init()) { 50524bbb1faSMichael Holzheu rc = -ENODATA; 50624bbb1faSMichael Holzheu goto fail_diag; 50724bbb1faSMichael Holzheu } 50831cb4bd3SMichael Holzheu } 5099b477705SGreg Kroah-Hartman s390_kobj = kobject_create_and_add("s390", hypervisor_kobj); 5109b477705SGreg Kroah-Hartman if (!s390_kobj) { 5119b477705SGreg Kroah-Hartman rc = -ENOMEM;; 51224bbb1faSMichael Holzheu goto fail_sysfs; 5139b477705SGreg Kroah-Hartman } 51424bbb1faSMichael Holzheu rc = register_filesystem(&hypfs_type); 51524bbb1faSMichael Holzheu if (rc) 51624bbb1faSMichael Holzheu goto fail_filesystem; 51724bbb1faSMichael Holzheu return 0; 51824bbb1faSMichael Holzheu 51924bbb1faSMichael Holzheu fail_filesystem: 5209b477705SGreg Kroah-Hartman kobject_unregister(s390_kobj); 52124bbb1faSMichael Holzheu fail_sysfs: 52231cb4bd3SMichael Holzheu if (!MACHINE_IS_VM) 52324bbb1faSMichael Holzheu hypfs_diag_exit(); 52424bbb1faSMichael Holzheu fail_diag: 52524bbb1faSMichael Holzheu printk(KERN_ERR "hypfs: Initialization failed with rc = %i.\n", rc); 52624bbb1faSMichael Holzheu return rc; 52724bbb1faSMichael Holzheu } 52824bbb1faSMichael Holzheu 52924bbb1faSMichael Holzheu static void __exit hypfs_exit(void) 53024bbb1faSMichael Holzheu { 53131cb4bd3SMichael Holzheu if (!MACHINE_IS_VM) 53224bbb1faSMichael Holzheu hypfs_diag_exit(); 53324bbb1faSMichael Holzheu unregister_filesystem(&hypfs_type); 5349b477705SGreg Kroah-Hartman kobject_unregister(s390_kobj); 53524bbb1faSMichael Holzheu } 53624bbb1faSMichael Holzheu 53724bbb1faSMichael Holzheu module_init(hypfs_init) 53824bbb1faSMichael Holzheu module_exit(hypfs_exit) 53924bbb1faSMichael Holzheu 54024bbb1faSMichael Holzheu MODULE_LICENSE("GPL"); 54124bbb1faSMichael Holzheu MODULE_AUTHOR("Michael Holzheu <holzheu@de.ibm.com>"); 54224bbb1faSMichael Holzheu MODULE_DESCRIPTION("s390 Hypervisor Filesystem"); 543