124bbb1faSMichael Holzheu /* 2f19bfb2cSMichael Holzheu * arch/s390/hypfs/inode.c 324bbb1faSMichael Holzheu * Hypervisor filesystem for Linux on s390. 424bbb1faSMichael Holzheu * 5f55495baSMichael Holzheu * Copyright IBM Corp. 2006, 2008 624bbb1faSMichael Holzheu * Author(s): Michael Holzheu <holzheu@de.ibm.com> 724bbb1faSMichael Holzheu */ 824bbb1faSMichael Holzheu 9f55495baSMichael Holzheu #define KMSG_COMPONENT "hypfs" 10f55495baSMichael Holzheu #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 11f55495baSMichael Holzheu 1224bbb1faSMichael Holzheu #include <linux/types.h> 1324bbb1faSMichael Holzheu #include <linux/errno.h> 1424bbb1faSMichael Holzheu #include <linux/fs.h> 1524bbb1faSMichael Holzheu #include <linux/namei.h> 1624bbb1faSMichael Holzheu #include <linux/vfs.h> 1724bbb1faSMichael Holzheu #include <linux/pagemap.h> 1824bbb1faSMichael Holzheu #include <linux/gfp.h> 1924bbb1faSMichael Holzheu #include <linux/time.h> 2024bbb1faSMichael Holzheu #include <linux/parser.h> 2124bbb1faSMichael Holzheu #include <linux/sysfs.h> 2224bbb1faSMichael Holzheu #include <linux/module.h> 23b01af5baSMichael Holzheu #include <linux/seq_file.h> 24b01af5baSMichael Holzheu #include <linux/mount.h> 2524bbb1faSMichael Holzheu #include <asm/ebcdic.h> 2624bbb1faSMichael Holzheu #include "hypfs.h" 2724bbb1faSMichael Holzheu 2824bbb1faSMichael Holzheu #define HYPFS_MAGIC 0x687970 /* ASCII 'hyp' */ 2924bbb1faSMichael Holzheu #define TMP_SIZE 64 /* size of temporary buffers */ 3024bbb1faSMichael Holzheu 3124bbb1faSMichael Holzheu static struct dentry *hypfs_create_update_file(struct super_block *sb, 3224bbb1faSMichael Holzheu struct dentry *dir); 3324bbb1faSMichael Holzheu 3424bbb1faSMichael Holzheu struct hypfs_sb_info { 3524bbb1faSMichael Holzheu uid_t uid; /* uid used for files and dirs */ 3624bbb1faSMichael Holzheu gid_t gid; /* gid used for files and dirs */ 3724bbb1faSMichael Holzheu struct dentry *update_file; /* file to trigger update */ 3824bbb1faSMichael Holzheu time_t last_update; /* last update time in secs since 1970 */ 3924bbb1faSMichael Holzheu struct mutex lock; /* lock to protect update process */ 4024bbb1faSMichael Holzheu }; 4124bbb1faSMichael Holzheu 425dfe4c96SArjan van de Ven static const struct file_operations hypfs_file_ops; 4324bbb1faSMichael Holzheu static struct file_system_type hypfs_type; 4424bbb1faSMichael Holzheu static struct super_operations hypfs_s_ops; 4524bbb1faSMichael Holzheu 4624bbb1faSMichael Holzheu /* start of list of all dentries, which have to be deleted on update */ 4724bbb1faSMichael Holzheu static struct dentry *hypfs_last_dentry; 4824bbb1faSMichael Holzheu 4924bbb1faSMichael Holzheu static void hypfs_update_update(struct super_block *sb) 5024bbb1faSMichael Holzheu { 5124bbb1faSMichael Holzheu struct hypfs_sb_info *sb_info = sb->s_fs_info; 5224bbb1faSMichael Holzheu struct inode *inode = sb_info->update_file->d_inode; 5324bbb1faSMichael Holzheu 5424bbb1faSMichael Holzheu sb_info->last_update = get_seconds(); 5524bbb1faSMichael Holzheu inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 5624bbb1faSMichael Holzheu } 5724bbb1faSMichael Holzheu 5824bbb1faSMichael Holzheu /* directory tree removal functions */ 5924bbb1faSMichael Holzheu 6024bbb1faSMichael Holzheu static void hypfs_add_dentry(struct dentry *dentry) 6124bbb1faSMichael Holzheu { 6224bbb1faSMichael Holzheu dentry->d_fsdata = hypfs_last_dentry; 6324bbb1faSMichael Holzheu hypfs_last_dentry = dentry; 6424bbb1faSMichael Holzheu } 6524bbb1faSMichael Holzheu 669b5a03e1SMichael Holzheu static inline int hypfs_positive(struct dentry *dentry) 679b5a03e1SMichael Holzheu { 689b5a03e1SMichael Holzheu return dentry->d_inode && !d_unhashed(dentry); 699b5a03e1SMichael Holzheu } 709b5a03e1SMichael Holzheu 7124bbb1faSMichael Holzheu static void hypfs_remove(struct dentry *dentry) 7224bbb1faSMichael Holzheu { 7324bbb1faSMichael Holzheu struct dentry *parent; 7424bbb1faSMichael Holzheu 7524bbb1faSMichael Holzheu parent = dentry->d_parent; 769b5a03e1SMichael Holzheu if (!parent || !parent->d_inode) 779b5a03e1SMichael Holzheu return; 789b5a03e1SMichael Holzheu mutex_lock(&parent->d_inode->i_mutex); 799b5a03e1SMichael Holzheu if (hypfs_positive(dentry)) { 8024bbb1faSMichael Holzheu if (S_ISDIR(dentry->d_inode->i_mode)) 8124bbb1faSMichael Holzheu simple_rmdir(parent->d_inode, dentry); 8224bbb1faSMichael Holzheu else 8324bbb1faSMichael Holzheu simple_unlink(parent->d_inode, dentry); 849b5a03e1SMichael Holzheu } 8524bbb1faSMichael Holzheu d_delete(dentry); 8624bbb1faSMichael Holzheu dput(dentry); 879b5a03e1SMichael Holzheu mutex_unlock(&parent->d_inode->i_mutex); 8824bbb1faSMichael Holzheu } 8924bbb1faSMichael Holzheu 9024bbb1faSMichael Holzheu static void hypfs_delete_tree(struct dentry *root) 9124bbb1faSMichael Holzheu { 9224bbb1faSMichael Holzheu while (hypfs_last_dentry) { 9324bbb1faSMichael Holzheu struct dentry *next_dentry; 9424bbb1faSMichael Holzheu next_dentry = hypfs_last_dentry->d_fsdata; 9524bbb1faSMichael Holzheu hypfs_remove(hypfs_last_dentry); 9624bbb1faSMichael Holzheu hypfs_last_dentry = next_dentry; 9724bbb1faSMichael Holzheu } 9824bbb1faSMichael Holzheu } 9924bbb1faSMichael Holzheu 10024bbb1faSMichael Holzheu static struct inode *hypfs_make_inode(struct super_block *sb, int mode) 10124bbb1faSMichael Holzheu { 10224bbb1faSMichael Holzheu struct inode *ret = new_inode(sb); 10324bbb1faSMichael Holzheu 10424bbb1faSMichael Holzheu if (ret) { 10524bbb1faSMichael Holzheu struct hypfs_sb_info *hypfs_info = sb->s_fs_info; 10624bbb1faSMichael Holzheu ret->i_mode = mode; 10724bbb1faSMichael Holzheu ret->i_uid = hypfs_info->uid; 10824bbb1faSMichael Holzheu ret->i_gid = hypfs_info->gid; 10924bbb1faSMichael Holzheu ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME; 11024bbb1faSMichael Holzheu if (mode & S_IFDIR) 11124bbb1faSMichael Holzheu ret->i_nlink = 2; 11224bbb1faSMichael Holzheu else 11324bbb1faSMichael Holzheu ret->i_nlink = 1; 11424bbb1faSMichael Holzheu } 11524bbb1faSMichael Holzheu return ret; 11624bbb1faSMichael Holzheu } 11724bbb1faSMichael Holzheu 11824bbb1faSMichael Holzheu static void hypfs_drop_inode(struct inode *inode) 11924bbb1faSMichael Holzheu { 1208e18e294STheodore Ts'o kfree(inode->i_private); 12124bbb1faSMichael Holzheu generic_delete_inode(inode); 12224bbb1faSMichael Holzheu } 12324bbb1faSMichael Holzheu 12424bbb1faSMichael Holzheu static int hypfs_open(struct inode *inode, struct file *filp) 12524bbb1faSMichael Holzheu { 126d20343e7SJosef Sipek char *data = filp->f_path.dentry->d_inode->i_private; 12724bbb1faSMichael Holzheu struct hypfs_sb_info *fs_info; 12824bbb1faSMichael Holzheu 12924bbb1faSMichael Holzheu if (filp->f_mode & FMODE_WRITE) { 13024bbb1faSMichael Holzheu if (!(inode->i_mode & S_IWUGO)) 13124bbb1faSMichael Holzheu return -EACCES; 13224bbb1faSMichael Holzheu } 13324bbb1faSMichael Holzheu if (filp->f_mode & FMODE_READ) { 13424bbb1faSMichael Holzheu if (!(inode->i_mode & S_IRUGO)) 13524bbb1faSMichael Holzheu return -EACCES; 13624bbb1faSMichael Holzheu } 13724bbb1faSMichael Holzheu 13824bbb1faSMichael Holzheu fs_info = inode->i_sb->s_fs_info; 13924bbb1faSMichael Holzheu if(data) { 14024bbb1faSMichael Holzheu mutex_lock(&fs_info->lock); 14124bbb1faSMichael Holzheu filp->private_data = kstrdup(data, GFP_KERNEL); 14224bbb1faSMichael Holzheu if (!filp->private_data) { 14324bbb1faSMichael Holzheu mutex_unlock(&fs_info->lock); 14424bbb1faSMichael Holzheu return -ENOMEM; 14524bbb1faSMichael Holzheu } 14624bbb1faSMichael Holzheu mutex_unlock(&fs_info->lock); 14724bbb1faSMichael Holzheu } 14824bbb1faSMichael Holzheu return 0; 14924bbb1faSMichael Holzheu } 15024bbb1faSMichael Holzheu 151027445c3SBadari Pulavarty static ssize_t hypfs_aio_read(struct kiocb *iocb, const struct iovec *iov, 152027445c3SBadari Pulavarty unsigned long nr_segs, loff_t offset) 15324bbb1faSMichael Holzheu { 15424bbb1faSMichael Holzheu char *data; 155a29591c4SAkinobu Mita ssize_t ret; 15624bbb1faSMichael Holzheu struct file *filp = iocb->ki_filp; 157027445c3SBadari Pulavarty /* XXX: temporary */ 158027445c3SBadari Pulavarty char __user *buf = iov[0].iov_base; 159027445c3SBadari Pulavarty size_t count = iov[0].iov_len; 160027445c3SBadari Pulavarty 161a29591c4SAkinobu Mita if (nr_segs != 1) 162a29591c4SAkinobu Mita return -EINVAL; 16324bbb1faSMichael Holzheu 16424bbb1faSMichael Holzheu data = filp->private_data; 165a29591c4SAkinobu Mita ret = simple_read_from_buffer(buf, count, &offset, data, strlen(data)); 166a29591c4SAkinobu Mita if (ret <= 0) 167a29591c4SAkinobu Mita return ret; 168a29591c4SAkinobu Mita 169a29591c4SAkinobu Mita iocb->ki_pos += ret; 17024bbb1faSMichael Holzheu file_accessed(filp); 171a29591c4SAkinobu Mita 172a29591c4SAkinobu Mita return ret; 17324bbb1faSMichael Holzheu } 174027445c3SBadari Pulavarty static ssize_t hypfs_aio_write(struct kiocb *iocb, const struct iovec *iov, 175027445c3SBadari Pulavarty unsigned long nr_segs, loff_t offset) 17624bbb1faSMichael Holzheu { 17724bbb1faSMichael Holzheu int rc; 17824bbb1faSMichael Holzheu struct super_block *sb; 17924bbb1faSMichael Holzheu struct hypfs_sb_info *fs_info; 180027445c3SBadari Pulavarty size_t count = iov_length(iov, nr_segs); 18124bbb1faSMichael Holzheu 182d20343e7SJosef Sipek sb = iocb->ki_filp->f_path.dentry->d_inode->i_sb; 18324bbb1faSMichael Holzheu fs_info = sb->s_fs_info; 18424bbb1faSMichael Holzheu /* 18524bbb1faSMichael Holzheu * Currently we only allow one update per second for two reasons: 18624bbb1faSMichael Holzheu * 1. diag 204 is VERY expensive 18724bbb1faSMichael Holzheu * 2. If several processes do updates in parallel and then read the 18824bbb1faSMichael Holzheu * hypfs data, the likelihood of collisions is reduced, if we restrict 18924bbb1faSMichael Holzheu * the minimum update interval. A collision occurs, if during the 19024bbb1faSMichael Holzheu * data gathering of one process another process triggers an update 19124bbb1faSMichael Holzheu * If the first process wants to ensure consistent data, it has 19224bbb1faSMichael Holzheu * to restart data collection in this case. 19324bbb1faSMichael Holzheu */ 19424bbb1faSMichael Holzheu mutex_lock(&fs_info->lock); 19524bbb1faSMichael Holzheu if (fs_info->last_update == get_seconds()) { 19624bbb1faSMichael Holzheu rc = -EBUSY; 19724bbb1faSMichael Holzheu goto out; 19824bbb1faSMichael Holzheu } 19924bbb1faSMichael Holzheu hypfs_delete_tree(sb->s_root); 20031cb4bd3SMichael Holzheu if (MACHINE_IS_VM) 20131cb4bd3SMichael Holzheu rc = hypfs_vm_create_files(sb, sb->s_root); 20231cb4bd3SMichael Holzheu else 20324bbb1faSMichael Holzheu rc = hypfs_diag_create_files(sb, sb->s_root); 20424bbb1faSMichael Holzheu if (rc) { 205f55495baSMichael Holzheu pr_err("Updating the hypfs tree failed\n"); 20624bbb1faSMichael Holzheu hypfs_delete_tree(sb->s_root); 20724bbb1faSMichael Holzheu goto out; 20824bbb1faSMichael Holzheu } 20924bbb1faSMichael Holzheu hypfs_update_update(sb); 21024bbb1faSMichael Holzheu rc = count; 21124bbb1faSMichael Holzheu out: 21224bbb1faSMichael Holzheu mutex_unlock(&fs_info->lock); 21324bbb1faSMichael Holzheu return rc; 21424bbb1faSMichael Holzheu } 21524bbb1faSMichael Holzheu 21624bbb1faSMichael Holzheu static int hypfs_release(struct inode *inode, struct file *filp) 21724bbb1faSMichael Holzheu { 21824bbb1faSMichael Holzheu kfree(filp->private_data); 21924bbb1faSMichael Holzheu return 0; 22024bbb1faSMichael Holzheu } 22124bbb1faSMichael Holzheu 22224bbb1faSMichael Holzheu enum { opt_uid, opt_gid, opt_err }; 22324bbb1faSMichael Holzheu 224a447c093SSteven Whitehouse static const match_table_t hypfs_tokens = { 22524bbb1faSMichael Holzheu {opt_uid, "uid=%u"}, 22624bbb1faSMichael Holzheu {opt_gid, "gid=%u"}, 22724bbb1faSMichael Holzheu {opt_err, NULL} 22824bbb1faSMichael Holzheu }; 22924bbb1faSMichael Holzheu 23024bbb1faSMichael Holzheu static int hypfs_parse_options(char *options, struct super_block *sb) 23124bbb1faSMichael Holzheu { 23224bbb1faSMichael Holzheu char *str; 23324bbb1faSMichael Holzheu substring_t args[MAX_OPT_ARGS]; 23424bbb1faSMichael Holzheu 23524bbb1faSMichael Holzheu if (!options) 23624bbb1faSMichael Holzheu return 0; 23724bbb1faSMichael Holzheu while ((str = strsep(&options, ",")) != NULL) { 23824bbb1faSMichael Holzheu int token, option; 23924bbb1faSMichael Holzheu struct hypfs_sb_info *hypfs_info = sb->s_fs_info; 24024bbb1faSMichael Holzheu 24124bbb1faSMichael Holzheu if (!*str) 24224bbb1faSMichael Holzheu continue; 24324bbb1faSMichael Holzheu token = match_token(str, hypfs_tokens, args); 24424bbb1faSMichael Holzheu switch (token) { 24524bbb1faSMichael Holzheu case opt_uid: 24624bbb1faSMichael Holzheu if (match_int(&args[0], &option)) 24724bbb1faSMichael Holzheu return -EINVAL; 24824bbb1faSMichael Holzheu hypfs_info->uid = option; 24924bbb1faSMichael Holzheu break; 25024bbb1faSMichael Holzheu case opt_gid: 25124bbb1faSMichael Holzheu if (match_int(&args[0], &option)) 25224bbb1faSMichael Holzheu return -EINVAL; 25324bbb1faSMichael Holzheu hypfs_info->gid = option; 25424bbb1faSMichael Holzheu break; 25524bbb1faSMichael Holzheu case opt_err: 25624bbb1faSMichael Holzheu default: 257f55495baSMichael Holzheu pr_err("%s is not a valid mount option\n", str); 25824bbb1faSMichael Holzheu return -EINVAL; 25924bbb1faSMichael Holzheu } 26024bbb1faSMichael Holzheu } 26124bbb1faSMichael Holzheu return 0; 26224bbb1faSMichael Holzheu } 26324bbb1faSMichael Holzheu 264b01af5baSMichael Holzheu static int hypfs_show_options(struct seq_file *s, struct vfsmount *mnt) 265b01af5baSMichael Holzheu { 266b01af5baSMichael Holzheu struct hypfs_sb_info *hypfs_info = mnt->mnt_sb->s_fs_info; 267b01af5baSMichael Holzheu 268b01af5baSMichael Holzheu seq_printf(s, ",uid=%u", hypfs_info->uid); 269b01af5baSMichael Holzheu seq_printf(s, ",gid=%u", hypfs_info->gid); 270b01af5baSMichael Holzheu return 0; 271b01af5baSMichael Holzheu } 272b01af5baSMichael Holzheu 27324bbb1faSMichael Holzheu static int hypfs_fill_super(struct super_block *sb, void *data, int silent) 27424bbb1faSMichael Holzheu { 27524bbb1faSMichael Holzheu struct inode *root_inode; 27624bbb1faSMichael Holzheu struct dentry *root_dentry; 27724bbb1faSMichael Holzheu int rc = 0; 27824bbb1faSMichael Holzheu struct hypfs_sb_info *sbi; 27924bbb1faSMichael Holzheu 28024bbb1faSMichael Holzheu sbi = kzalloc(sizeof(struct hypfs_sb_info), GFP_KERNEL); 28124bbb1faSMichael Holzheu if (!sbi) 28224bbb1faSMichael Holzheu return -ENOMEM; 28324bbb1faSMichael Holzheu mutex_init(&sbi->lock); 284e5423705SDavid Howells sbi->uid = current_uid(); 285e5423705SDavid Howells sbi->gid = current_gid(); 28624bbb1faSMichael Holzheu sb->s_fs_info = sbi; 28724bbb1faSMichael Holzheu sb->s_blocksize = PAGE_CACHE_SIZE; 28824bbb1faSMichael Holzheu sb->s_blocksize_bits = PAGE_CACHE_SHIFT; 28924bbb1faSMichael Holzheu sb->s_magic = HYPFS_MAGIC; 29024bbb1faSMichael Holzheu sb->s_op = &hypfs_s_ops; 29124bbb1faSMichael Holzheu if (hypfs_parse_options(data, sb)) { 29224bbb1faSMichael Holzheu rc = -EINVAL; 29324bbb1faSMichael Holzheu goto err_alloc; 29424bbb1faSMichael Holzheu } 29524bbb1faSMichael Holzheu root_inode = hypfs_make_inode(sb, S_IFDIR | 0755); 29624bbb1faSMichael Holzheu if (!root_inode) { 29724bbb1faSMichael Holzheu rc = -ENOMEM; 29824bbb1faSMichael Holzheu goto err_alloc; 29924bbb1faSMichael Holzheu } 30024bbb1faSMichael Holzheu root_inode->i_op = &simple_dir_inode_operations; 30124bbb1faSMichael Holzheu root_inode->i_fop = &simple_dir_operations; 30224bbb1faSMichael Holzheu root_dentry = d_alloc_root(root_inode); 30324bbb1faSMichael Holzheu if (!root_dentry) { 30424bbb1faSMichael Holzheu iput(root_inode); 30524bbb1faSMichael Holzheu rc = -ENOMEM; 30624bbb1faSMichael Holzheu goto err_alloc; 30724bbb1faSMichael Holzheu } 30831cb4bd3SMichael Holzheu if (MACHINE_IS_VM) 30931cb4bd3SMichael Holzheu rc = hypfs_vm_create_files(sb, root_dentry); 31031cb4bd3SMichael Holzheu else 31124bbb1faSMichael Holzheu rc = hypfs_diag_create_files(sb, root_dentry); 31224bbb1faSMichael Holzheu if (rc) 31324bbb1faSMichael Holzheu goto err_tree; 31424bbb1faSMichael Holzheu sbi->update_file = hypfs_create_update_file(sb, root_dentry); 31524bbb1faSMichael Holzheu if (IS_ERR(sbi->update_file)) { 31624bbb1faSMichael Holzheu rc = PTR_ERR(sbi->update_file); 31724bbb1faSMichael Holzheu goto err_tree; 31824bbb1faSMichael Holzheu } 31924bbb1faSMichael Holzheu hypfs_update_update(sb); 32024bbb1faSMichael Holzheu sb->s_root = root_dentry; 321f55495baSMichael Holzheu pr_info("Hypervisor filesystem mounted\n"); 32224bbb1faSMichael Holzheu return 0; 32324bbb1faSMichael Holzheu 32424bbb1faSMichael Holzheu err_tree: 32524bbb1faSMichael Holzheu hypfs_delete_tree(root_dentry); 32624bbb1faSMichael Holzheu d_genocide(root_dentry); 32724bbb1faSMichael Holzheu dput(root_dentry); 32824bbb1faSMichael Holzheu err_alloc: 32924bbb1faSMichael Holzheu kfree(sbi); 33024bbb1faSMichael Holzheu return rc; 33124bbb1faSMichael Holzheu } 33224bbb1faSMichael Holzheu 333a5cf4b9aSAndrew Morton static int hypfs_get_super(struct file_system_type *fst, int flags, 334a5cf4b9aSAndrew Morton const char *devname, void *data, struct vfsmount *mnt) 33524bbb1faSMichael Holzheu { 336a5cf4b9aSAndrew Morton return get_sb_single(fst, flags, data, hypfs_fill_super, mnt); 33724bbb1faSMichael Holzheu } 33824bbb1faSMichael Holzheu 33924bbb1faSMichael Holzheu static void hypfs_kill_super(struct super_block *sb) 34024bbb1faSMichael Holzheu { 34124bbb1faSMichael Holzheu struct hypfs_sb_info *sb_info = sb->s_fs_info; 34224bbb1faSMichael Holzheu 343388c571cSMichael Holzheu if (sb->s_root) { 34424bbb1faSMichael Holzheu hypfs_delete_tree(sb->s_root); 34524bbb1faSMichael Holzheu hypfs_remove(sb_info->update_file); 34624bbb1faSMichael Holzheu kfree(sb->s_fs_info); 34724bbb1faSMichael Holzheu sb->s_fs_info = NULL; 348388c571cSMichael Holzheu } 34924bbb1faSMichael Holzheu kill_litter_super(sb); 35024bbb1faSMichael Holzheu } 35124bbb1faSMichael Holzheu 35224bbb1faSMichael Holzheu static struct dentry *hypfs_create_file(struct super_block *sb, 35324bbb1faSMichael Holzheu struct dentry *parent, const char *name, 35424bbb1faSMichael Holzheu char *data, mode_t mode) 35524bbb1faSMichael Holzheu { 35624bbb1faSMichael Holzheu struct dentry *dentry; 35724bbb1faSMichael Holzheu struct inode *inode; 35824bbb1faSMichael Holzheu 3599b5a03e1SMichael Holzheu mutex_lock(&parent->d_inode->i_mutex); 36024bbb1faSMichael Holzheu dentry = lookup_one_len(name, parent, strlen(name)); 3619b5a03e1SMichael Holzheu if (IS_ERR(dentry)) { 3629b5a03e1SMichael Holzheu dentry = ERR_PTR(-ENOMEM); 3639b5a03e1SMichael Holzheu goto fail; 3649b5a03e1SMichael Holzheu } 36524bbb1faSMichael Holzheu inode = hypfs_make_inode(sb, mode); 36624bbb1faSMichael Holzheu if (!inode) { 36724bbb1faSMichael Holzheu dput(dentry); 3689b5a03e1SMichael Holzheu dentry = ERR_PTR(-ENOMEM); 3699b5a03e1SMichael Holzheu goto fail; 37024bbb1faSMichael Holzheu } 37124bbb1faSMichael Holzheu if (mode & S_IFREG) { 37224bbb1faSMichael Holzheu inode->i_fop = &hypfs_file_ops; 37324bbb1faSMichael Holzheu if (data) 37424bbb1faSMichael Holzheu inode->i_size = strlen(data); 37524bbb1faSMichael Holzheu else 37624bbb1faSMichael Holzheu inode->i_size = 0; 37724bbb1faSMichael Holzheu } else if (mode & S_IFDIR) { 37824bbb1faSMichael Holzheu inode->i_op = &simple_dir_inode_operations; 37924bbb1faSMichael Holzheu inode->i_fop = &simple_dir_operations; 38024bbb1faSMichael Holzheu parent->d_inode->i_nlink++; 38124bbb1faSMichael Holzheu } else 38224bbb1faSMichael Holzheu BUG(); 3838e18e294STheodore Ts'o inode->i_private = data; 38424bbb1faSMichael Holzheu d_instantiate(dentry, inode); 38524bbb1faSMichael Holzheu dget(dentry); 3869b5a03e1SMichael Holzheu fail: 3879b5a03e1SMichael Holzheu mutex_unlock(&parent->d_inode->i_mutex); 38824bbb1faSMichael Holzheu return dentry; 38924bbb1faSMichael Holzheu } 39024bbb1faSMichael Holzheu 39124bbb1faSMichael Holzheu struct dentry *hypfs_mkdir(struct super_block *sb, struct dentry *parent, 39224bbb1faSMichael Holzheu const char *name) 39324bbb1faSMichael Holzheu { 39424bbb1faSMichael Holzheu struct dentry *dentry; 39524bbb1faSMichael Holzheu 39624bbb1faSMichael Holzheu dentry = hypfs_create_file(sb, parent, name, NULL, S_IFDIR | DIR_MODE); 39724bbb1faSMichael Holzheu if (IS_ERR(dentry)) 39824bbb1faSMichael Holzheu return dentry; 39924bbb1faSMichael Holzheu hypfs_add_dentry(dentry); 40024bbb1faSMichael Holzheu return dentry; 40124bbb1faSMichael Holzheu } 40224bbb1faSMichael Holzheu 40324bbb1faSMichael Holzheu static struct dentry *hypfs_create_update_file(struct super_block *sb, 40424bbb1faSMichael Holzheu struct dentry *dir) 40524bbb1faSMichael Holzheu { 40624bbb1faSMichael Holzheu struct dentry *dentry; 40724bbb1faSMichael Holzheu 40824bbb1faSMichael Holzheu dentry = hypfs_create_file(sb, dir, "update", NULL, 40924bbb1faSMichael Holzheu S_IFREG | UPDATE_FILE_MODE); 41024bbb1faSMichael Holzheu /* 41124bbb1faSMichael Holzheu * We do not put the update file on the 'delete' list with 41224bbb1faSMichael Holzheu * hypfs_add_dentry(), since it should not be removed when the tree 41324bbb1faSMichael Holzheu * is updated. 41424bbb1faSMichael Holzheu */ 41524bbb1faSMichael Holzheu return dentry; 41624bbb1faSMichael Holzheu } 41724bbb1faSMichael Holzheu 41824bbb1faSMichael Holzheu struct dentry *hypfs_create_u64(struct super_block *sb, struct dentry *dir, 41924bbb1faSMichael Holzheu const char *name, __u64 value) 42024bbb1faSMichael Holzheu { 42124bbb1faSMichael Holzheu char *buffer; 42224bbb1faSMichael Holzheu char tmp[TMP_SIZE]; 42324bbb1faSMichael Holzheu struct dentry *dentry; 42424bbb1faSMichael Holzheu 425ad2a5d8eSMichael Holzheu snprintf(tmp, TMP_SIZE, "%llu\n", (unsigned long long int)value); 42624bbb1faSMichael Holzheu buffer = kstrdup(tmp, GFP_KERNEL); 42724bbb1faSMichael Holzheu if (!buffer) 42824bbb1faSMichael Holzheu return ERR_PTR(-ENOMEM); 42924bbb1faSMichael Holzheu dentry = 43024bbb1faSMichael Holzheu hypfs_create_file(sb, dir, name, buffer, S_IFREG | REG_FILE_MODE); 43124bbb1faSMichael Holzheu if (IS_ERR(dentry)) { 43224bbb1faSMichael Holzheu kfree(buffer); 43324bbb1faSMichael Holzheu return ERR_PTR(-ENOMEM); 43424bbb1faSMichael Holzheu } 43524bbb1faSMichael Holzheu hypfs_add_dentry(dentry); 43624bbb1faSMichael Holzheu return dentry; 43724bbb1faSMichael Holzheu } 43824bbb1faSMichael Holzheu 43924bbb1faSMichael Holzheu struct dentry *hypfs_create_str(struct super_block *sb, struct dentry *dir, 44024bbb1faSMichael Holzheu const char *name, char *string) 44124bbb1faSMichael Holzheu { 44224bbb1faSMichael Holzheu char *buffer; 44324bbb1faSMichael Holzheu struct dentry *dentry; 44424bbb1faSMichael Holzheu 44524bbb1faSMichael Holzheu buffer = kmalloc(strlen(string) + 2, GFP_KERNEL); 44624bbb1faSMichael Holzheu if (!buffer) 44724bbb1faSMichael Holzheu return ERR_PTR(-ENOMEM); 44824bbb1faSMichael Holzheu sprintf(buffer, "%s\n", string); 44924bbb1faSMichael Holzheu dentry = 45024bbb1faSMichael Holzheu hypfs_create_file(sb, dir, name, buffer, S_IFREG | REG_FILE_MODE); 45124bbb1faSMichael Holzheu if (IS_ERR(dentry)) { 45224bbb1faSMichael Holzheu kfree(buffer); 45324bbb1faSMichael Holzheu return ERR_PTR(-ENOMEM); 45424bbb1faSMichael Holzheu } 45524bbb1faSMichael Holzheu hypfs_add_dentry(dentry); 45624bbb1faSMichael Holzheu return dentry; 45724bbb1faSMichael Holzheu } 45824bbb1faSMichael Holzheu 4595dfe4c96SArjan van de Ven static const struct file_operations hypfs_file_ops = { 46024bbb1faSMichael Holzheu .open = hypfs_open, 46124bbb1faSMichael Holzheu .release = hypfs_release, 46224bbb1faSMichael Holzheu .read = do_sync_read, 46324bbb1faSMichael Holzheu .write = do_sync_write, 46424bbb1faSMichael Holzheu .aio_read = hypfs_aio_read, 46524bbb1faSMichael Holzheu .aio_write = hypfs_aio_write, 46624bbb1faSMichael Holzheu }; 46724bbb1faSMichael Holzheu 46824bbb1faSMichael Holzheu static struct file_system_type hypfs_type = { 46924bbb1faSMichael Holzheu .owner = THIS_MODULE, 47024bbb1faSMichael Holzheu .name = "s390_hypfs", 47124bbb1faSMichael Holzheu .get_sb = hypfs_get_super, 47224bbb1faSMichael Holzheu .kill_sb = hypfs_kill_super 47324bbb1faSMichael Holzheu }; 47424bbb1faSMichael Holzheu 47524bbb1faSMichael Holzheu static struct super_operations hypfs_s_ops = { 47624bbb1faSMichael Holzheu .statfs = simple_statfs, 47724bbb1faSMichael Holzheu .drop_inode = hypfs_drop_inode, 478b01af5baSMichael Holzheu .show_options = hypfs_show_options, 47924bbb1faSMichael Holzheu }; 48024bbb1faSMichael Holzheu 4819b477705SGreg Kroah-Hartman static struct kobject *s390_kobj; 48224bbb1faSMichael Holzheu 48324bbb1faSMichael Holzheu static int __init hypfs_init(void) 48424bbb1faSMichael Holzheu { 48524bbb1faSMichael Holzheu int rc; 48624bbb1faSMichael Holzheu 48731cb4bd3SMichael Holzheu if (MACHINE_IS_VM) { 48831cb4bd3SMichael Holzheu if (hypfs_vm_init()) 48931cb4bd3SMichael Holzheu /* no diag 2fc, just exit */ 49024bbb1faSMichael Holzheu return -ENODATA; 49131cb4bd3SMichael Holzheu } else { 49224bbb1faSMichael Holzheu if (hypfs_diag_init()) { 49324bbb1faSMichael Holzheu rc = -ENODATA; 49424bbb1faSMichael Holzheu goto fail_diag; 49524bbb1faSMichael Holzheu } 49631cb4bd3SMichael Holzheu } 4979b477705SGreg Kroah-Hartman s390_kobj = kobject_create_and_add("s390", hypervisor_kobj); 4989b477705SGreg Kroah-Hartman if (!s390_kobj) { 4999b477705SGreg Kroah-Hartman rc = -ENOMEM;; 50024bbb1faSMichael Holzheu goto fail_sysfs; 5019b477705SGreg Kroah-Hartman } 50224bbb1faSMichael Holzheu rc = register_filesystem(&hypfs_type); 50324bbb1faSMichael Holzheu if (rc) 50424bbb1faSMichael Holzheu goto fail_filesystem; 50524bbb1faSMichael Holzheu return 0; 50624bbb1faSMichael Holzheu 50724bbb1faSMichael Holzheu fail_filesystem: 50838a382aeSGreg Kroah-Hartman kobject_put(s390_kobj); 50924bbb1faSMichael Holzheu fail_sysfs: 51031cb4bd3SMichael Holzheu if (!MACHINE_IS_VM) 51124bbb1faSMichael Holzheu hypfs_diag_exit(); 51224bbb1faSMichael Holzheu fail_diag: 513f55495baSMichael Holzheu pr_err("Initialization of hypfs failed with rc=%i\n", rc); 51424bbb1faSMichael Holzheu return rc; 51524bbb1faSMichael Holzheu } 51624bbb1faSMichael Holzheu 51724bbb1faSMichael Holzheu static void __exit hypfs_exit(void) 51824bbb1faSMichael Holzheu { 51931cb4bd3SMichael Holzheu if (!MACHINE_IS_VM) 52024bbb1faSMichael Holzheu hypfs_diag_exit(); 52124bbb1faSMichael Holzheu unregister_filesystem(&hypfs_type); 52238a382aeSGreg Kroah-Hartman kobject_put(s390_kobj); 52324bbb1faSMichael Holzheu } 52424bbb1faSMichael Holzheu 52524bbb1faSMichael Holzheu module_init(hypfs_init) 52624bbb1faSMichael Holzheu module_exit(hypfs_exit) 52724bbb1faSMichael Holzheu 52824bbb1faSMichael Holzheu MODULE_LICENSE("GPL"); 52924bbb1faSMichael Holzheu MODULE_AUTHOR("Michael Holzheu <holzheu@de.ibm.com>"); 53024bbb1faSMichael Holzheu MODULE_DESCRIPTION("s390 Hypervisor Filesystem"); 531