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> 175a0e3ad6STejun Heo #include <linux/slab.h> 1824bbb1faSMichael Holzheu #include <linux/pagemap.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; 44b87221deSAlexey Dobriyan static const 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 100fec0ebaeSAl Viro static struct inode *hypfs_make_inode(struct super_block *sb, umode_t 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; 106c960bec4SMichael Holzheu ret->i_ino = get_next_ino(); 10724bbb1faSMichael Holzheu ret->i_mode = mode; 10824bbb1faSMichael Holzheu ret->i_uid = hypfs_info->uid; 10924bbb1faSMichael Holzheu ret->i_gid = hypfs_info->gid; 11024bbb1faSMichael Holzheu ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME; 111fec0ebaeSAl Viro if (S_ISDIR(mode)) 112bfe86848SMiklos Szeredi set_nlink(ret, 2); 11324bbb1faSMichael Holzheu } 11424bbb1faSMichael Holzheu return ret; 11524bbb1faSMichael Holzheu } 11624bbb1faSMichael Holzheu 117b69257f2SAl Viro static void hypfs_evict_inode(struct inode *inode) 11824bbb1faSMichael Holzheu { 119dbd5768fSJan Kara clear_inode(inode); 1208e18e294STheodore Ts'o kfree(inode->i_private); 12124bbb1faSMichael Holzheu } 12224bbb1faSMichael Holzheu 12324bbb1faSMichael Holzheu static int hypfs_open(struct inode *inode, struct file *filp) 12424bbb1faSMichael Holzheu { 125d20343e7SJosef Sipek char *data = filp->f_path.dentry->d_inode->i_private; 12624bbb1faSMichael Holzheu struct hypfs_sb_info *fs_info; 12724bbb1faSMichael Holzheu 12824bbb1faSMichael Holzheu if (filp->f_mode & FMODE_WRITE) { 12924bbb1faSMichael Holzheu if (!(inode->i_mode & S_IWUGO)) 13024bbb1faSMichael Holzheu return -EACCES; 13124bbb1faSMichael Holzheu } 13224bbb1faSMichael Holzheu if (filp->f_mode & FMODE_READ) { 13324bbb1faSMichael Holzheu if (!(inode->i_mode & S_IRUGO)) 13424bbb1faSMichael Holzheu return -EACCES; 13524bbb1faSMichael Holzheu } 13624bbb1faSMichael Holzheu 13724bbb1faSMichael Holzheu fs_info = inode->i_sb->s_fs_info; 13824bbb1faSMichael Holzheu if(data) { 13924bbb1faSMichael Holzheu mutex_lock(&fs_info->lock); 14024bbb1faSMichael Holzheu filp->private_data = kstrdup(data, GFP_KERNEL); 14124bbb1faSMichael Holzheu if (!filp->private_data) { 14224bbb1faSMichael Holzheu mutex_unlock(&fs_info->lock); 14324bbb1faSMichael Holzheu return -ENOMEM; 14424bbb1faSMichael Holzheu } 14524bbb1faSMichael Holzheu mutex_unlock(&fs_info->lock); 14624bbb1faSMichael Holzheu } 14758ea91c0SMartin Schwidefsky return nonseekable_open(inode, filp); 14824bbb1faSMichael Holzheu } 14924bbb1faSMichael Holzheu 150027445c3SBadari Pulavarty static ssize_t hypfs_aio_read(struct kiocb *iocb, const struct iovec *iov, 151027445c3SBadari Pulavarty unsigned long nr_segs, loff_t offset) 15224bbb1faSMichael Holzheu { 15324bbb1faSMichael Holzheu char *data; 154a29591c4SAkinobu Mita ssize_t ret; 15524bbb1faSMichael Holzheu struct file *filp = iocb->ki_filp; 156027445c3SBadari Pulavarty /* XXX: temporary */ 157027445c3SBadari Pulavarty char __user *buf = iov[0].iov_base; 158027445c3SBadari Pulavarty size_t count = iov[0].iov_len; 159027445c3SBadari Pulavarty 160a29591c4SAkinobu Mita if (nr_segs != 1) 161a29591c4SAkinobu Mita return -EINVAL; 16224bbb1faSMichael Holzheu 16324bbb1faSMichael Holzheu data = filp->private_data; 164a29591c4SAkinobu Mita ret = simple_read_from_buffer(buf, count, &offset, data, strlen(data)); 165a29591c4SAkinobu Mita if (ret <= 0) 166a29591c4SAkinobu Mita return ret; 167a29591c4SAkinobu Mita 168a29591c4SAkinobu Mita iocb->ki_pos += ret; 16924bbb1faSMichael Holzheu file_accessed(filp); 170a29591c4SAkinobu Mita 171a29591c4SAkinobu Mita return ret; 17224bbb1faSMichael Holzheu } 173027445c3SBadari Pulavarty static ssize_t hypfs_aio_write(struct kiocb *iocb, const struct iovec *iov, 174027445c3SBadari Pulavarty unsigned long nr_segs, loff_t offset) 17524bbb1faSMichael Holzheu { 17624bbb1faSMichael Holzheu int rc; 17724bbb1faSMichael Holzheu struct super_block *sb; 17824bbb1faSMichael Holzheu struct hypfs_sb_info *fs_info; 179027445c3SBadari Pulavarty size_t count = iov_length(iov, nr_segs); 18024bbb1faSMichael Holzheu 181d20343e7SJosef Sipek sb = iocb->ki_filp->f_path.dentry->d_inode->i_sb; 18224bbb1faSMichael Holzheu fs_info = sb->s_fs_info; 18324bbb1faSMichael Holzheu /* 18424bbb1faSMichael Holzheu * Currently we only allow one update per second for two reasons: 18524bbb1faSMichael Holzheu * 1. diag 204 is VERY expensive 18624bbb1faSMichael Holzheu * 2. If several processes do updates in parallel and then read the 18724bbb1faSMichael Holzheu * hypfs data, the likelihood of collisions is reduced, if we restrict 18824bbb1faSMichael Holzheu * the minimum update interval. A collision occurs, if during the 18924bbb1faSMichael Holzheu * data gathering of one process another process triggers an update 19024bbb1faSMichael Holzheu * If the first process wants to ensure consistent data, it has 19124bbb1faSMichael Holzheu * to restart data collection in this case. 19224bbb1faSMichael Holzheu */ 19324bbb1faSMichael Holzheu mutex_lock(&fs_info->lock); 19424bbb1faSMichael Holzheu if (fs_info->last_update == get_seconds()) { 19524bbb1faSMichael Holzheu rc = -EBUSY; 19624bbb1faSMichael Holzheu goto out; 19724bbb1faSMichael Holzheu } 19824bbb1faSMichael Holzheu hypfs_delete_tree(sb->s_root); 19931cb4bd3SMichael Holzheu if (MACHINE_IS_VM) 20031cb4bd3SMichael Holzheu rc = hypfs_vm_create_files(sb, sb->s_root); 20131cb4bd3SMichael Holzheu else 20224bbb1faSMichael Holzheu rc = hypfs_diag_create_files(sb, sb->s_root); 20324bbb1faSMichael Holzheu if (rc) { 204f55495baSMichael Holzheu pr_err("Updating the hypfs tree failed\n"); 20524bbb1faSMichael Holzheu hypfs_delete_tree(sb->s_root); 20624bbb1faSMichael Holzheu goto out; 20724bbb1faSMichael Holzheu } 20824bbb1faSMichael Holzheu hypfs_update_update(sb); 20924bbb1faSMichael Holzheu rc = count; 21024bbb1faSMichael Holzheu out: 21124bbb1faSMichael Holzheu mutex_unlock(&fs_info->lock); 21224bbb1faSMichael Holzheu return rc; 21324bbb1faSMichael Holzheu } 21424bbb1faSMichael Holzheu 21524bbb1faSMichael Holzheu static int hypfs_release(struct inode *inode, struct file *filp) 21624bbb1faSMichael Holzheu { 21724bbb1faSMichael Holzheu kfree(filp->private_data); 21824bbb1faSMichael Holzheu return 0; 21924bbb1faSMichael Holzheu } 22024bbb1faSMichael Holzheu 22124bbb1faSMichael Holzheu enum { opt_uid, opt_gid, opt_err }; 22224bbb1faSMichael Holzheu 223a447c093SSteven Whitehouse static const match_table_t hypfs_tokens = { 22424bbb1faSMichael Holzheu {opt_uid, "uid=%u"}, 22524bbb1faSMichael Holzheu {opt_gid, "gid=%u"}, 22624bbb1faSMichael Holzheu {opt_err, NULL} 22724bbb1faSMichael Holzheu }; 22824bbb1faSMichael Holzheu 22924bbb1faSMichael Holzheu static int hypfs_parse_options(char *options, struct super_block *sb) 23024bbb1faSMichael Holzheu { 23124bbb1faSMichael Holzheu char *str; 23224bbb1faSMichael Holzheu substring_t args[MAX_OPT_ARGS]; 23324bbb1faSMichael Holzheu 23424bbb1faSMichael Holzheu if (!options) 23524bbb1faSMichael Holzheu return 0; 23624bbb1faSMichael Holzheu while ((str = strsep(&options, ",")) != NULL) { 23724bbb1faSMichael Holzheu int token, option; 23824bbb1faSMichael Holzheu struct hypfs_sb_info *hypfs_info = sb->s_fs_info; 23924bbb1faSMichael Holzheu 24024bbb1faSMichael Holzheu if (!*str) 24124bbb1faSMichael Holzheu continue; 24224bbb1faSMichael Holzheu token = match_token(str, hypfs_tokens, args); 24324bbb1faSMichael Holzheu switch (token) { 24424bbb1faSMichael Holzheu case opt_uid: 24524bbb1faSMichael Holzheu if (match_int(&args[0], &option)) 24624bbb1faSMichael Holzheu return -EINVAL; 24724bbb1faSMichael Holzheu hypfs_info->uid = option; 24824bbb1faSMichael Holzheu break; 24924bbb1faSMichael Holzheu case opt_gid: 25024bbb1faSMichael Holzheu if (match_int(&args[0], &option)) 25124bbb1faSMichael Holzheu return -EINVAL; 25224bbb1faSMichael Holzheu hypfs_info->gid = option; 25324bbb1faSMichael Holzheu break; 25424bbb1faSMichael Holzheu case opt_err: 25524bbb1faSMichael Holzheu default: 256f55495baSMichael Holzheu pr_err("%s is not a valid mount option\n", str); 25724bbb1faSMichael Holzheu return -EINVAL; 25824bbb1faSMichael Holzheu } 25924bbb1faSMichael Holzheu } 26024bbb1faSMichael Holzheu return 0; 26124bbb1faSMichael Holzheu } 26224bbb1faSMichael Holzheu 26334c80b1dSAl Viro static int hypfs_show_options(struct seq_file *s, struct dentry *root) 264b01af5baSMichael Holzheu { 26534c80b1dSAl Viro struct hypfs_sb_info *hypfs_info = root->d_sb->s_fs_info; 266b01af5baSMichael Holzheu 267b01af5baSMichael Holzheu seq_printf(s, ",uid=%u", hypfs_info->uid); 268b01af5baSMichael Holzheu seq_printf(s, ",gid=%u", hypfs_info->gid); 269b01af5baSMichael Holzheu return 0; 270b01af5baSMichael Holzheu } 271b01af5baSMichael Holzheu 27224bbb1faSMichael Holzheu static int hypfs_fill_super(struct super_block *sb, void *data, int silent) 27324bbb1faSMichael Holzheu { 27424bbb1faSMichael Holzheu struct inode *root_inode; 27524bbb1faSMichael Holzheu struct dentry *root_dentry; 27624bbb1faSMichael Holzheu int rc = 0; 27724bbb1faSMichael Holzheu struct hypfs_sb_info *sbi; 27824bbb1faSMichael Holzheu 27924bbb1faSMichael Holzheu sbi = kzalloc(sizeof(struct hypfs_sb_info), GFP_KERNEL); 28024bbb1faSMichael Holzheu if (!sbi) 28124bbb1faSMichael Holzheu return -ENOMEM; 28224bbb1faSMichael Holzheu mutex_init(&sbi->lock); 283e5423705SDavid Howells sbi->uid = current_uid(); 284e5423705SDavid Howells sbi->gid = current_gid(); 28524bbb1faSMichael Holzheu sb->s_fs_info = sbi; 28624bbb1faSMichael Holzheu sb->s_blocksize = PAGE_CACHE_SIZE; 28724bbb1faSMichael Holzheu sb->s_blocksize_bits = PAGE_CACHE_SHIFT; 28824bbb1faSMichael Holzheu sb->s_magic = HYPFS_MAGIC; 28924bbb1faSMichael Holzheu sb->s_op = &hypfs_s_ops; 290f1771ffaSAl Viro if (hypfs_parse_options(data, sb)) 291f1771ffaSAl Viro return -EINVAL; 29224bbb1faSMichael Holzheu root_inode = hypfs_make_inode(sb, S_IFDIR | 0755); 293f1771ffaSAl Viro if (!root_inode) 294f1771ffaSAl Viro return -ENOMEM; 29524bbb1faSMichael Holzheu root_inode->i_op = &simple_dir_inode_operations; 29624bbb1faSMichael Holzheu root_inode->i_fop = &simple_dir_operations; 29748fde701SAl Viro sb->s_root = root_dentry = d_make_root(root_inode); 29848fde701SAl Viro if (!root_dentry) 299f1771ffaSAl Viro return -ENOMEM; 30031cb4bd3SMichael Holzheu if (MACHINE_IS_VM) 30131cb4bd3SMichael Holzheu rc = hypfs_vm_create_files(sb, root_dentry); 30231cb4bd3SMichael Holzheu else 30324bbb1faSMichael Holzheu rc = hypfs_diag_create_files(sb, root_dentry); 30424bbb1faSMichael Holzheu if (rc) 305f1771ffaSAl Viro return rc; 30624bbb1faSMichael Holzheu sbi->update_file = hypfs_create_update_file(sb, root_dentry); 307f1771ffaSAl Viro if (IS_ERR(sbi->update_file)) 308f1771ffaSAl Viro return PTR_ERR(sbi->update_file); 30924bbb1faSMichael Holzheu hypfs_update_update(sb); 310f55495baSMichael Holzheu pr_info("Hypervisor filesystem mounted\n"); 31124bbb1faSMichael Holzheu return 0; 31224bbb1faSMichael Holzheu } 31324bbb1faSMichael Holzheu 314fc14f2feSAl Viro static struct dentry *hypfs_mount(struct file_system_type *fst, int flags, 315fc14f2feSAl Viro const char *devname, void *data) 31624bbb1faSMichael Holzheu { 317fc14f2feSAl Viro return mount_single(fst, flags, data, hypfs_fill_super); 31824bbb1faSMichael Holzheu } 31924bbb1faSMichael Holzheu 32024bbb1faSMichael Holzheu static void hypfs_kill_super(struct super_block *sb) 32124bbb1faSMichael Holzheu { 32224bbb1faSMichael Holzheu struct hypfs_sb_info *sb_info = sb->s_fs_info; 32324bbb1faSMichael Holzheu 324f1771ffaSAl Viro if (sb->s_root) 32524bbb1faSMichael Holzheu hypfs_delete_tree(sb->s_root); 326f1771ffaSAl Viro if (sb_info->update_file) 32724bbb1faSMichael Holzheu hypfs_remove(sb_info->update_file); 32824bbb1faSMichael Holzheu kfree(sb->s_fs_info); 32924bbb1faSMichael Holzheu sb->s_fs_info = NULL; 33024bbb1faSMichael Holzheu kill_litter_super(sb); 33124bbb1faSMichael Holzheu } 33224bbb1faSMichael Holzheu 33324bbb1faSMichael Holzheu static struct dentry *hypfs_create_file(struct super_block *sb, 33424bbb1faSMichael Holzheu struct dentry *parent, const char *name, 335fec0ebaeSAl Viro char *data, umode_t mode) 33624bbb1faSMichael Holzheu { 33724bbb1faSMichael Holzheu struct dentry *dentry; 33824bbb1faSMichael Holzheu struct inode *inode; 33924bbb1faSMichael Holzheu 3409b5a03e1SMichael Holzheu mutex_lock(&parent->d_inode->i_mutex); 34124bbb1faSMichael Holzheu dentry = lookup_one_len(name, parent, strlen(name)); 3429b5a03e1SMichael Holzheu if (IS_ERR(dentry)) { 3439b5a03e1SMichael Holzheu dentry = ERR_PTR(-ENOMEM); 3449b5a03e1SMichael Holzheu goto fail; 3459b5a03e1SMichael Holzheu } 34624bbb1faSMichael Holzheu inode = hypfs_make_inode(sb, mode); 34724bbb1faSMichael Holzheu if (!inode) { 34824bbb1faSMichael Holzheu dput(dentry); 3499b5a03e1SMichael Holzheu dentry = ERR_PTR(-ENOMEM); 3509b5a03e1SMichael Holzheu goto fail; 35124bbb1faSMichael Holzheu } 352fec0ebaeSAl Viro if (S_ISREG(mode)) { 35324bbb1faSMichael Holzheu inode->i_fop = &hypfs_file_ops; 35424bbb1faSMichael Holzheu if (data) 35524bbb1faSMichael Holzheu inode->i_size = strlen(data); 35624bbb1faSMichael Holzheu else 35724bbb1faSMichael Holzheu inode->i_size = 0; 358fec0ebaeSAl Viro } else if (S_ISDIR(mode)) { 35924bbb1faSMichael Holzheu inode->i_op = &simple_dir_inode_operations; 36024bbb1faSMichael Holzheu inode->i_fop = &simple_dir_operations; 3616d6b77f1SMiklos Szeredi inc_nlink(parent->d_inode); 36224bbb1faSMichael Holzheu } else 36324bbb1faSMichael Holzheu BUG(); 3648e18e294STheodore Ts'o inode->i_private = data; 36524bbb1faSMichael Holzheu d_instantiate(dentry, inode); 36624bbb1faSMichael Holzheu dget(dentry); 3679b5a03e1SMichael Holzheu fail: 3689b5a03e1SMichael Holzheu mutex_unlock(&parent->d_inode->i_mutex); 36924bbb1faSMichael Holzheu return dentry; 37024bbb1faSMichael Holzheu } 37124bbb1faSMichael Holzheu 37224bbb1faSMichael Holzheu struct dentry *hypfs_mkdir(struct super_block *sb, struct dentry *parent, 37324bbb1faSMichael Holzheu const char *name) 37424bbb1faSMichael Holzheu { 37524bbb1faSMichael Holzheu struct dentry *dentry; 37624bbb1faSMichael Holzheu 37724bbb1faSMichael Holzheu dentry = hypfs_create_file(sb, parent, name, NULL, S_IFDIR | DIR_MODE); 37824bbb1faSMichael Holzheu if (IS_ERR(dentry)) 37924bbb1faSMichael Holzheu return dentry; 38024bbb1faSMichael Holzheu hypfs_add_dentry(dentry); 38124bbb1faSMichael Holzheu return dentry; 38224bbb1faSMichael Holzheu } 38324bbb1faSMichael Holzheu 38424bbb1faSMichael Holzheu static struct dentry *hypfs_create_update_file(struct super_block *sb, 38524bbb1faSMichael Holzheu struct dentry *dir) 38624bbb1faSMichael Holzheu { 38724bbb1faSMichael Holzheu struct dentry *dentry; 38824bbb1faSMichael Holzheu 38924bbb1faSMichael Holzheu dentry = hypfs_create_file(sb, dir, "update", NULL, 39024bbb1faSMichael Holzheu S_IFREG | UPDATE_FILE_MODE); 39124bbb1faSMichael Holzheu /* 39224bbb1faSMichael Holzheu * We do not put the update file on the 'delete' list with 39324bbb1faSMichael Holzheu * hypfs_add_dentry(), since it should not be removed when the tree 39424bbb1faSMichael Holzheu * is updated. 39524bbb1faSMichael Holzheu */ 39624bbb1faSMichael Holzheu return dentry; 39724bbb1faSMichael Holzheu } 39824bbb1faSMichael Holzheu 39924bbb1faSMichael Holzheu struct dentry *hypfs_create_u64(struct super_block *sb, struct dentry *dir, 40024bbb1faSMichael Holzheu const char *name, __u64 value) 40124bbb1faSMichael Holzheu { 40224bbb1faSMichael Holzheu char *buffer; 40324bbb1faSMichael Holzheu char tmp[TMP_SIZE]; 40424bbb1faSMichael Holzheu struct dentry *dentry; 40524bbb1faSMichael Holzheu 406ad2a5d8eSMichael Holzheu snprintf(tmp, TMP_SIZE, "%llu\n", (unsigned long long int)value); 40724bbb1faSMichael Holzheu buffer = kstrdup(tmp, GFP_KERNEL); 40824bbb1faSMichael Holzheu if (!buffer) 40924bbb1faSMichael Holzheu return ERR_PTR(-ENOMEM); 41024bbb1faSMichael Holzheu dentry = 41124bbb1faSMichael Holzheu hypfs_create_file(sb, dir, name, buffer, S_IFREG | REG_FILE_MODE); 41224bbb1faSMichael Holzheu if (IS_ERR(dentry)) { 41324bbb1faSMichael Holzheu kfree(buffer); 41424bbb1faSMichael Holzheu return ERR_PTR(-ENOMEM); 41524bbb1faSMichael Holzheu } 41624bbb1faSMichael Holzheu hypfs_add_dentry(dentry); 41724bbb1faSMichael Holzheu return dentry; 41824bbb1faSMichael Holzheu } 41924bbb1faSMichael Holzheu 42024bbb1faSMichael Holzheu struct dentry *hypfs_create_str(struct super_block *sb, struct dentry *dir, 42124bbb1faSMichael Holzheu const char *name, char *string) 42224bbb1faSMichael Holzheu { 42324bbb1faSMichael Holzheu char *buffer; 42424bbb1faSMichael Holzheu struct dentry *dentry; 42524bbb1faSMichael Holzheu 42624bbb1faSMichael Holzheu buffer = kmalloc(strlen(string) + 2, GFP_KERNEL); 42724bbb1faSMichael Holzheu if (!buffer) 42824bbb1faSMichael Holzheu return ERR_PTR(-ENOMEM); 42924bbb1faSMichael Holzheu sprintf(buffer, "%s\n", string); 43024bbb1faSMichael Holzheu dentry = 43124bbb1faSMichael Holzheu hypfs_create_file(sb, dir, name, buffer, S_IFREG | REG_FILE_MODE); 43224bbb1faSMichael Holzheu if (IS_ERR(dentry)) { 43324bbb1faSMichael Holzheu kfree(buffer); 43424bbb1faSMichael Holzheu return ERR_PTR(-ENOMEM); 43524bbb1faSMichael Holzheu } 43624bbb1faSMichael Holzheu hypfs_add_dentry(dentry); 43724bbb1faSMichael Holzheu return dentry; 43824bbb1faSMichael Holzheu } 43924bbb1faSMichael Holzheu 4405dfe4c96SArjan van de Ven static const struct file_operations hypfs_file_ops = { 44124bbb1faSMichael Holzheu .open = hypfs_open, 44224bbb1faSMichael Holzheu .release = hypfs_release, 44324bbb1faSMichael Holzheu .read = do_sync_read, 44424bbb1faSMichael Holzheu .write = do_sync_write, 44524bbb1faSMichael Holzheu .aio_read = hypfs_aio_read, 44624bbb1faSMichael Holzheu .aio_write = hypfs_aio_write, 4476038f373SArnd Bergmann .llseek = no_llseek, 44824bbb1faSMichael Holzheu }; 44924bbb1faSMichael Holzheu 45024bbb1faSMichael Holzheu static struct file_system_type hypfs_type = { 45124bbb1faSMichael Holzheu .owner = THIS_MODULE, 45224bbb1faSMichael Holzheu .name = "s390_hypfs", 453fc14f2feSAl Viro .mount = hypfs_mount, 45424bbb1faSMichael Holzheu .kill_sb = hypfs_kill_super 45524bbb1faSMichael Holzheu }; 45624bbb1faSMichael Holzheu 457b87221deSAlexey Dobriyan static const struct super_operations hypfs_s_ops = { 45824bbb1faSMichael Holzheu .statfs = simple_statfs, 459b69257f2SAl Viro .evict_inode = hypfs_evict_inode, 460b01af5baSMichael Holzheu .show_options = hypfs_show_options, 46124bbb1faSMichael Holzheu }; 46224bbb1faSMichael Holzheu 4639b477705SGreg Kroah-Hartman static struct kobject *s390_kobj; 46424bbb1faSMichael Holzheu 46524bbb1faSMichael Holzheu static int __init hypfs_init(void) 46624bbb1faSMichael Holzheu { 46724bbb1faSMichael Holzheu int rc; 46824bbb1faSMichael Holzheu 4692fcb3686SMichael Holzheu rc = hypfs_dbfs_init(); 4702fcb3686SMichael Holzheu if (rc) 4712fcb3686SMichael Holzheu return rc; 47224bbb1faSMichael Holzheu if (hypfs_diag_init()) { 47324bbb1faSMichael Holzheu rc = -ENODATA; 4742fcb3686SMichael Holzheu goto fail_dbfs_exit; 47524bbb1faSMichael Holzheu } 47657b28f66SMichael Holzheu if (hypfs_vm_init()) { 47757b28f66SMichael Holzheu rc = -ENODATA; 47857b28f66SMichael Holzheu goto fail_hypfs_diag_exit; 47931cb4bd3SMichael Holzheu } 4809b477705SGreg Kroah-Hartman s390_kobj = kobject_create_and_add("s390", hypervisor_kobj); 4819b477705SGreg Kroah-Hartman if (!s390_kobj) { 482a419aef8SJoe Perches rc = -ENOMEM; 48357b28f66SMichael Holzheu goto fail_hypfs_vm_exit; 4849b477705SGreg Kroah-Hartman } 48524bbb1faSMichael Holzheu rc = register_filesystem(&hypfs_type); 48624bbb1faSMichael Holzheu if (rc) 48724bbb1faSMichael Holzheu goto fail_filesystem; 48824bbb1faSMichael Holzheu return 0; 48924bbb1faSMichael Holzheu 49024bbb1faSMichael Holzheu fail_filesystem: 49138a382aeSGreg Kroah-Hartman kobject_put(s390_kobj); 49257b28f66SMichael Holzheu fail_hypfs_vm_exit: 49357b28f66SMichael Holzheu hypfs_vm_exit(); 49457b28f66SMichael Holzheu fail_hypfs_diag_exit: 49524bbb1faSMichael Holzheu hypfs_diag_exit(); 4962fcb3686SMichael Holzheu fail_dbfs_exit: 4972fcb3686SMichael Holzheu hypfs_dbfs_exit(); 498f55495baSMichael Holzheu pr_err("Initialization of hypfs failed with rc=%i\n", rc); 49924bbb1faSMichael Holzheu return rc; 50024bbb1faSMichael Holzheu } 50124bbb1faSMichael Holzheu 50224bbb1faSMichael Holzheu static void __exit hypfs_exit(void) 50324bbb1faSMichael Holzheu { 50424bbb1faSMichael Holzheu hypfs_diag_exit(); 50557b28f66SMichael Holzheu hypfs_vm_exit(); 5062fcb3686SMichael Holzheu hypfs_dbfs_exit(); 50724bbb1faSMichael Holzheu unregister_filesystem(&hypfs_type); 50838a382aeSGreg Kroah-Hartman kobject_put(s390_kobj); 50924bbb1faSMichael Holzheu } 51024bbb1faSMichael Holzheu 51124bbb1faSMichael Holzheu module_init(hypfs_init) 51224bbb1faSMichael Holzheu module_exit(hypfs_exit) 51324bbb1faSMichael Holzheu 51424bbb1faSMichael Holzheu MODULE_LICENSE("GPL"); 51524bbb1faSMichael Holzheu MODULE_AUTHOR("Michael Holzheu <holzheu@de.ibm.com>"); 51624bbb1faSMichael Holzheu MODULE_DESCRIPTION("s390 Hypervisor Filesystem"); 517