10b73214fSGreg Kroah-Hartman // SPDX-License-Identifier: GPL-1.0+ 224bbb1faSMichael Holzheu /* 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> 22cee672e1SPaul Gortmaker #include <linux/init.h> 23cee672e1SPaul Gortmaker #include <linux/kobject.h> 24b01af5baSMichael Holzheu #include <linux/seq_file.h> 25b01af5baSMichael Holzheu #include <linux/mount.h> 26e2e40f2cSChristoph Hellwig #include <linux/uio.h> 2724bbb1faSMichael Holzheu #include <asm/ebcdic.h> 2824bbb1faSMichael Holzheu #include "hypfs.h" 2924bbb1faSMichael Holzheu 3024bbb1faSMichael Holzheu #define HYPFS_MAGIC 0x687970 /* ASCII 'hyp' */ 3124bbb1faSMichael Holzheu #define TMP_SIZE 64 /* size of temporary buffers */ 3224bbb1faSMichael Holzheu 33a118cfdfSAl Viro static struct dentry *hypfs_create_update_file(struct dentry *dir); 3424bbb1faSMichael Holzheu 3524bbb1faSMichael Holzheu struct hypfs_sb_info { 366a62a216SEric W. Biederman kuid_t uid; /* uid used for files and dirs */ 376a62a216SEric W. Biederman kgid_t gid; /* gid used for files and dirs */ 3824bbb1faSMichael Holzheu struct dentry *update_file; /* file to trigger update */ 396075e4aeSArnd Bergmann time64_t last_update; /* last update, CLOCK_MONOTONIC time */ 4024bbb1faSMichael Holzheu struct mutex lock; /* lock to protect update process */ 4124bbb1faSMichael Holzheu }; 4224bbb1faSMichael Holzheu 435dfe4c96SArjan van de Ven static const struct file_operations hypfs_file_ops; 4424bbb1faSMichael Holzheu static struct file_system_type hypfs_type; 45b87221deSAlexey Dobriyan static const struct super_operations hypfs_s_ops; 4624bbb1faSMichael Holzheu 4724bbb1faSMichael Holzheu /* start of list of all dentries, which have to be deleted on update */ 4824bbb1faSMichael Holzheu static struct dentry *hypfs_last_dentry; 4924bbb1faSMichael Holzheu 5024bbb1faSMichael Holzheu static void hypfs_update_update(struct super_block *sb) 5124bbb1faSMichael Holzheu { 5224bbb1faSMichael Holzheu struct hypfs_sb_info *sb_info = sb->s_fs_info; 5375c3cfa8SDavid Howells struct inode *inode = d_inode(sb_info->update_file); 5424bbb1faSMichael Holzheu 556075e4aeSArnd Bergmann sb_info->last_update = ktime_get_seconds(); 56078cd827SDeepa Dinamani inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); 5724bbb1faSMichael Holzheu } 5824bbb1faSMichael Holzheu 5924bbb1faSMichael Holzheu /* directory tree removal functions */ 6024bbb1faSMichael Holzheu 6124bbb1faSMichael Holzheu static void hypfs_add_dentry(struct dentry *dentry) 6224bbb1faSMichael Holzheu { 6324bbb1faSMichael Holzheu dentry->d_fsdata = hypfs_last_dentry; 6424bbb1faSMichael Holzheu hypfs_last_dentry = dentry; 6524bbb1faSMichael Holzheu } 6624bbb1faSMichael Holzheu 6724bbb1faSMichael Holzheu static void hypfs_remove(struct dentry *dentry) 6824bbb1faSMichael Holzheu { 6924bbb1faSMichael Holzheu struct dentry *parent; 7024bbb1faSMichael Holzheu 7124bbb1faSMichael Holzheu parent = dentry->d_parent; 725955102cSAl Viro inode_lock(d_inode(parent)); 73dc3f4198SAl Viro if (simple_positive(dentry)) { 74e36cb0b8SDavid Howells if (d_is_dir(dentry)) 7575c3cfa8SDavid Howells simple_rmdir(d_inode(parent), dentry); 7624bbb1faSMichael Holzheu else 7775c3cfa8SDavid Howells simple_unlink(d_inode(parent), dentry); 789b5a03e1SMichael Holzheu } 7929dfeb0bSAl Viro d_drop(dentry); 8024bbb1faSMichael Holzheu dput(dentry); 815955102cSAl Viro inode_unlock(d_inode(parent)); 8224bbb1faSMichael Holzheu } 8324bbb1faSMichael Holzheu 8424bbb1faSMichael Holzheu static void hypfs_delete_tree(struct dentry *root) 8524bbb1faSMichael Holzheu { 8624bbb1faSMichael Holzheu while (hypfs_last_dentry) { 8724bbb1faSMichael Holzheu struct dentry *next_dentry; 8824bbb1faSMichael Holzheu next_dentry = hypfs_last_dentry->d_fsdata; 8924bbb1faSMichael Holzheu hypfs_remove(hypfs_last_dentry); 9024bbb1faSMichael Holzheu hypfs_last_dentry = next_dentry; 9124bbb1faSMichael Holzheu } 9224bbb1faSMichael Holzheu } 9324bbb1faSMichael Holzheu 94fec0ebaeSAl Viro static struct inode *hypfs_make_inode(struct super_block *sb, umode_t mode) 9524bbb1faSMichael Holzheu { 9624bbb1faSMichael Holzheu struct inode *ret = new_inode(sb); 9724bbb1faSMichael Holzheu 9824bbb1faSMichael Holzheu if (ret) { 9924bbb1faSMichael Holzheu struct hypfs_sb_info *hypfs_info = sb->s_fs_info; 100c960bec4SMichael Holzheu ret->i_ino = get_next_ino(); 10124bbb1faSMichael Holzheu ret->i_mode = mode; 10224bbb1faSMichael Holzheu ret->i_uid = hypfs_info->uid; 10324bbb1faSMichael Holzheu ret->i_gid = hypfs_info->gid; 104078cd827SDeepa Dinamani ret->i_atime = ret->i_mtime = ret->i_ctime = current_time(ret); 105fec0ebaeSAl Viro if (S_ISDIR(mode)) 106bfe86848SMiklos Szeredi set_nlink(ret, 2); 10724bbb1faSMichael Holzheu } 10824bbb1faSMichael Holzheu return ret; 10924bbb1faSMichael Holzheu } 11024bbb1faSMichael Holzheu 111b69257f2SAl Viro static void hypfs_evict_inode(struct inode *inode) 11224bbb1faSMichael Holzheu { 113dbd5768fSJan Kara clear_inode(inode); 1148e18e294STheodore Ts'o kfree(inode->i_private); 11524bbb1faSMichael Holzheu } 11624bbb1faSMichael Holzheu 11724bbb1faSMichael Holzheu static int hypfs_open(struct inode *inode, struct file *filp) 11824bbb1faSMichael Holzheu { 119496ad9aaSAl Viro char *data = file_inode(filp)->i_private; 12024bbb1faSMichael Holzheu struct hypfs_sb_info *fs_info; 12124bbb1faSMichael Holzheu 12224bbb1faSMichael Holzheu if (filp->f_mode & FMODE_WRITE) { 12324bbb1faSMichael Holzheu if (!(inode->i_mode & S_IWUGO)) 12424bbb1faSMichael Holzheu return -EACCES; 12524bbb1faSMichael Holzheu } 12624bbb1faSMichael Holzheu if (filp->f_mode & FMODE_READ) { 12724bbb1faSMichael Holzheu if (!(inode->i_mode & S_IRUGO)) 12824bbb1faSMichael Holzheu return -EACCES; 12924bbb1faSMichael Holzheu } 13024bbb1faSMichael Holzheu 13124bbb1faSMichael Holzheu fs_info = inode->i_sb->s_fs_info; 13224bbb1faSMichael Holzheu if(data) { 13324bbb1faSMichael Holzheu mutex_lock(&fs_info->lock); 13424bbb1faSMichael Holzheu filp->private_data = kstrdup(data, GFP_KERNEL); 13524bbb1faSMichael Holzheu if (!filp->private_data) { 13624bbb1faSMichael Holzheu mutex_unlock(&fs_info->lock); 13724bbb1faSMichael Holzheu return -ENOMEM; 13824bbb1faSMichael Holzheu } 13924bbb1faSMichael Holzheu mutex_unlock(&fs_info->lock); 14024bbb1faSMichael Holzheu } 14158ea91c0SMartin Schwidefsky return nonseekable_open(inode, filp); 14224bbb1faSMichael Holzheu } 14324bbb1faSMichael Holzheu 144a457ac28SAl Viro static ssize_t hypfs_read_iter(struct kiocb *iocb, struct iov_iter *to) 14524bbb1faSMichael Holzheu { 146a457ac28SAl Viro struct file *file = iocb->ki_filp; 147a457ac28SAl Viro char *data = file->private_data; 148a457ac28SAl Viro size_t available = strlen(data); 149a457ac28SAl Viro loff_t pos = iocb->ki_pos; 150a457ac28SAl Viro size_t count; 151027445c3SBadari Pulavarty 152a457ac28SAl Viro if (pos < 0) 153a29591c4SAkinobu Mita return -EINVAL; 154a457ac28SAl Viro if (pos >= available || !iov_iter_count(to)) 155a457ac28SAl Viro return 0; 156a457ac28SAl Viro count = copy_to_iter(data + pos, available - pos, to); 157a457ac28SAl Viro if (!count) 158a457ac28SAl Viro return -EFAULT; 159a457ac28SAl Viro iocb->ki_pos = pos + count; 160a457ac28SAl Viro file_accessed(file); 161a457ac28SAl Viro return count; 16224bbb1faSMichael Holzheu } 163a457ac28SAl Viro 164a457ac28SAl Viro static ssize_t hypfs_write_iter(struct kiocb *iocb, struct iov_iter *from) 16524bbb1faSMichael Holzheu { 16624bbb1faSMichael Holzheu int rc; 1676131ffaaSAl Viro struct super_block *sb = file_inode(iocb->ki_filp)->i_sb; 1686131ffaaSAl Viro struct hypfs_sb_info *fs_info = sb->s_fs_info; 169a457ac28SAl Viro size_t count = iov_iter_count(from); 17024bbb1faSMichael Holzheu 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); 1826075e4aeSArnd Bergmann if (fs_info->last_update == ktime_get_seconds()) { 18324bbb1faSMichael Holzheu rc = -EBUSY; 18424bbb1faSMichael Holzheu goto out; 18524bbb1faSMichael Holzheu } 18624bbb1faSMichael Holzheu hypfs_delete_tree(sb->s_root); 18731cb4bd3SMichael Holzheu if (MACHINE_IS_VM) 188f78e41e3SAl Viro rc = hypfs_vm_create_files(sb->s_root); 18931cb4bd3SMichael Holzheu else 190e334cf4fSAl Viro rc = hypfs_diag_create_files(sb->s_root); 19124bbb1faSMichael Holzheu if (rc) { 192f55495baSMichael Holzheu pr_err("Updating the hypfs tree failed\n"); 19324bbb1faSMichael Holzheu hypfs_delete_tree(sb->s_root); 19424bbb1faSMichael Holzheu goto out; 19524bbb1faSMichael Holzheu } 19624bbb1faSMichael Holzheu hypfs_update_update(sb); 19724bbb1faSMichael Holzheu rc = count; 198a457ac28SAl Viro iov_iter_advance(from, count); 19924bbb1faSMichael Holzheu out: 20024bbb1faSMichael Holzheu mutex_unlock(&fs_info->lock); 20124bbb1faSMichael Holzheu return rc; 20224bbb1faSMichael Holzheu } 20324bbb1faSMichael Holzheu 20424bbb1faSMichael Holzheu static int hypfs_release(struct inode *inode, struct file *filp) 20524bbb1faSMichael Holzheu { 20624bbb1faSMichael Holzheu kfree(filp->private_data); 20724bbb1faSMichael Holzheu return 0; 20824bbb1faSMichael Holzheu } 20924bbb1faSMichael Holzheu 21024bbb1faSMichael Holzheu enum { opt_uid, opt_gid, opt_err }; 21124bbb1faSMichael Holzheu 212a447c093SSteven Whitehouse static const match_table_t hypfs_tokens = { 21324bbb1faSMichael Holzheu {opt_uid, "uid=%u"}, 21424bbb1faSMichael Holzheu {opt_gid, "gid=%u"}, 21524bbb1faSMichael Holzheu {opt_err, NULL} 21624bbb1faSMichael Holzheu }; 21724bbb1faSMichael Holzheu 21824bbb1faSMichael Holzheu static int hypfs_parse_options(char *options, struct super_block *sb) 21924bbb1faSMichael Holzheu { 22024bbb1faSMichael Holzheu char *str; 22124bbb1faSMichael Holzheu substring_t args[MAX_OPT_ARGS]; 2226a62a216SEric W. Biederman kuid_t uid; 2236a62a216SEric W. Biederman kgid_t gid; 22424bbb1faSMichael Holzheu 22524bbb1faSMichael Holzheu if (!options) 22624bbb1faSMichael Holzheu return 0; 22724bbb1faSMichael Holzheu while ((str = strsep(&options, ",")) != NULL) { 22824bbb1faSMichael Holzheu int token, option; 22924bbb1faSMichael Holzheu struct hypfs_sb_info *hypfs_info = sb->s_fs_info; 23024bbb1faSMichael Holzheu 23124bbb1faSMichael Holzheu if (!*str) 23224bbb1faSMichael Holzheu continue; 23324bbb1faSMichael Holzheu token = match_token(str, hypfs_tokens, args); 23424bbb1faSMichael Holzheu switch (token) { 23524bbb1faSMichael Holzheu case opt_uid: 23624bbb1faSMichael Holzheu if (match_int(&args[0], &option)) 23724bbb1faSMichael Holzheu return -EINVAL; 2386a62a216SEric W. Biederman uid = make_kuid(current_user_ns(), option); 2396a62a216SEric W. Biederman if (!uid_valid(uid)) 2406a62a216SEric W. Biederman return -EINVAL; 2416a62a216SEric W. Biederman hypfs_info->uid = uid; 24224bbb1faSMichael Holzheu break; 24324bbb1faSMichael Holzheu case opt_gid: 24424bbb1faSMichael Holzheu if (match_int(&args[0], &option)) 24524bbb1faSMichael Holzheu return -EINVAL; 2466a62a216SEric W. Biederman gid = make_kgid(current_user_ns(), option); 2476a62a216SEric W. Biederman if (!gid_valid(gid)) 2486a62a216SEric W. Biederman return -EINVAL; 2496a62a216SEric W. Biederman hypfs_info->gid = gid; 25024bbb1faSMichael Holzheu break; 25124bbb1faSMichael Holzheu case opt_err: 25224bbb1faSMichael Holzheu default: 253f55495baSMichael Holzheu pr_err("%s is not a valid mount option\n", str); 25424bbb1faSMichael Holzheu return -EINVAL; 25524bbb1faSMichael Holzheu } 25624bbb1faSMichael Holzheu } 25724bbb1faSMichael Holzheu return 0; 25824bbb1faSMichael Holzheu } 25924bbb1faSMichael Holzheu 26034c80b1dSAl Viro static int hypfs_show_options(struct seq_file *s, struct dentry *root) 261b01af5baSMichael Holzheu { 26234c80b1dSAl Viro struct hypfs_sb_info *hypfs_info = root->d_sb->s_fs_info; 263b01af5baSMichael Holzheu 2646a62a216SEric W. Biederman seq_printf(s, ",uid=%u", from_kuid_munged(&init_user_ns, hypfs_info->uid)); 2656a62a216SEric W. Biederman seq_printf(s, ",gid=%u", from_kgid_munged(&init_user_ns, hypfs_info->gid)); 266b01af5baSMichael Holzheu return 0; 267b01af5baSMichael Holzheu } 268b01af5baSMichael Holzheu 26924bbb1faSMichael Holzheu static int hypfs_fill_super(struct super_block *sb, void *data, int silent) 27024bbb1faSMichael Holzheu { 27124bbb1faSMichael Holzheu struct inode *root_inode; 27224bbb1faSMichael Holzheu struct dentry *root_dentry; 27324bbb1faSMichael Holzheu int rc = 0; 27424bbb1faSMichael Holzheu struct hypfs_sb_info *sbi; 27524bbb1faSMichael Holzheu 27624bbb1faSMichael Holzheu sbi = kzalloc(sizeof(struct hypfs_sb_info), GFP_KERNEL); 27724bbb1faSMichael Holzheu if (!sbi) 27824bbb1faSMichael Holzheu return -ENOMEM; 27924bbb1faSMichael Holzheu mutex_init(&sbi->lock); 280e5423705SDavid Howells sbi->uid = current_uid(); 281e5423705SDavid Howells sbi->gid = current_gid(); 28224bbb1faSMichael Holzheu sb->s_fs_info = sbi; 28309cbfeafSKirill A. Shutemov sb->s_blocksize = PAGE_SIZE; 28409cbfeafSKirill A. Shutemov sb->s_blocksize_bits = PAGE_SHIFT; 28524bbb1faSMichael Holzheu sb->s_magic = HYPFS_MAGIC; 28624bbb1faSMichael Holzheu sb->s_op = &hypfs_s_ops; 287f1771ffaSAl Viro if (hypfs_parse_options(data, sb)) 288f1771ffaSAl Viro return -EINVAL; 28924bbb1faSMichael Holzheu root_inode = hypfs_make_inode(sb, S_IFDIR | 0755); 290f1771ffaSAl Viro if (!root_inode) 291f1771ffaSAl Viro return -ENOMEM; 29224bbb1faSMichael Holzheu root_inode->i_op = &simple_dir_inode_operations; 29324bbb1faSMichael Holzheu root_inode->i_fop = &simple_dir_operations; 29448fde701SAl Viro sb->s_root = root_dentry = d_make_root(root_inode); 29548fde701SAl Viro if (!root_dentry) 296f1771ffaSAl Viro return -ENOMEM; 29731cb4bd3SMichael Holzheu if (MACHINE_IS_VM) 298f78e41e3SAl Viro rc = hypfs_vm_create_files(root_dentry); 29931cb4bd3SMichael Holzheu else 300e334cf4fSAl Viro rc = hypfs_diag_create_files(root_dentry); 30124bbb1faSMichael Holzheu if (rc) 302f1771ffaSAl Viro return rc; 303a118cfdfSAl Viro sbi->update_file = hypfs_create_update_file(root_dentry); 304f1771ffaSAl Viro if (IS_ERR(sbi->update_file)) 305f1771ffaSAl Viro return PTR_ERR(sbi->update_file); 30624bbb1faSMichael Holzheu hypfs_update_update(sb); 307f55495baSMichael Holzheu pr_info("Hypervisor filesystem mounted\n"); 30824bbb1faSMichael Holzheu return 0; 30924bbb1faSMichael Holzheu } 31024bbb1faSMichael Holzheu 311fc14f2feSAl Viro static struct dentry *hypfs_mount(struct file_system_type *fst, int flags, 312fc14f2feSAl Viro const char *devname, void *data) 31324bbb1faSMichael Holzheu { 314fc14f2feSAl Viro return mount_single(fst, flags, data, hypfs_fill_super); 31524bbb1faSMichael Holzheu } 31624bbb1faSMichael Holzheu 31724bbb1faSMichael Holzheu static void hypfs_kill_super(struct super_block *sb) 31824bbb1faSMichael Holzheu { 31924bbb1faSMichael Holzheu struct hypfs_sb_info *sb_info = sb->s_fs_info; 32024bbb1faSMichael Holzheu 321f1771ffaSAl Viro if (sb->s_root) 32224bbb1faSMichael Holzheu hypfs_delete_tree(sb->s_root); 323a24cd490SAl Viro if (sb_info && sb_info->update_file) 32424bbb1faSMichael Holzheu hypfs_remove(sb_info->update_file); 32524bbb1faSMichael Holzheu kfree(sb->s_fs_info); 32624bbb1faSMichael Holzheu sb->s_fs_info = NULL; 32724bbb1faSMichael Holzheu kill_litter_super(sb); 32824bbb1faSMichael Holzheu } 32924bbb1faSMichael Holzheu 330a118cfdfSAl Viro static struct dentry *hypfs_create_file(struct dentry *parent, const char *name, 331fec0ebaeSAl Viro char *data, umode_t mode) 33224bbb1faSMichael Holzheu { 33324bbb1faSMichael Holzheu struct dentry *dentry; 33424bbb1faSMichael Holzheu struct inode *inode; 33524bbb1faSMichael Holzheu 3365955102cSAl Viro inode_lock(d_inode(parent)); 33724bbb1faSMichael Holzheu dentry = lookup_one_len(name, parent, strlen(name)); 3389b5a03e1SMichael Holzheu if (IS_ERR(dentry)) { 3399b5a03e1SMichael Holzheu dentry = ERR_PTR(-ENOMEM); 3409b5a03e1SMichael Holzheu goto fail; 3419b5a03e1SMichael Holzheu } 342a118cfdfSAl Viro inode = hypfs_make_inode(parent->d_sb, mode); 34324bbb1faSMichael Holzheu if (!inode) { 34424bbb1faSMichael Holzheu dput(dentry); 3459b5a03e1SMichael Holzheu dentry = ERR_PTR(-ENOMEM); 3469b5a03e1SMichael Holzheu goto fail; 34724bbb1faSMichael Holzheu } 348fec0ebaeSAl Viro if (S_ISREG(mode)) { 34924bbb1faSMichael Holzheu inode->i_fop = &hypfs_file_ops; 35024bbb1faSMichael Holzheu if (data) 35124bbb1faSMichael Holzheu inode->i_size = strlen(data); 35224bbb1faSMichael Holzheu else 35324bbb1faSMichael Holzheu inode->i_size = 0; 354fec0ebaeSAl Viro } else if (S_ISDIR(mode)) { 35524bbb1faSMichael Holzheu inode->i_op = &simple_dir_inode_operations; 35624bbb1faSMichael Holzheu inode->i_fop = &simple_dir_operations; 35775c3cfa8SDavid Howells inc_nlink(d_inode(parent)); 35824bbb1faSMichael Holzheu } else 35924bbb1faSMichael Holzheu BUG(); 3608e18e294STheodore Ts'o inode->i_private = data; 36124bbb1faSMichael Holzheu d_instantiate(dentry, inode); 36224bbb1faSMichael Holzheu dget(dentry); 3639b5a03e1SMichael Holzheu fail: 3645955102cSAl Viro inode_unlock(d_inode(parent)); 36524bbb1faSMichael Holzheu return dentry; 36624bbb1faSMichael Holzheu } 36724bbb1faSMichael Holzheu 368a118cfdfSAl Viro struct dentry *hypfs_mkdir(struct dentry *parent, const char *name) 36924bbb1faSMichael Holzheu { 37024bbb1faSMichael Holzheu struct dentry *dentry; 37124bbb1faSMichael Holzheu 372a118cfdfSAl Viro dentry = hypfs_create_file(parent, name, NULL, S_IFDIR | DIR_MODE); 37324bbb1faSMichael Holzheu if (IS_ERR(dentry)) 37424bbb1faSMichael Holzheu return dentry; 37524bbb1faSMichael Holzheu hypfs_add_dentry(dentry); 37624bbb1faSMichael Holzheu return dentry; 37724bbb1faSMichael Holzheu } 37824bbb1faSMichael Holzheu 379a118cfdfSAl Viro static struct dentry *hypfs_create_update_file(struct dentry *dir) 38024bbb1faSMichael Holzheu { 38124bbb1faSMichael Holzheu struct dentry *dentry; 38224bbb1faSMichael Holzheu 383a118cfdfSAl Viro dentry = hypfs_create_file(dir, "update", NULL, 38424bbb1faSMichael Holzheu S_IFREG | UPDATE_FILE_MODE); 38524bbb1faSMichael Holzheu /* 38624bbb1faSMichael Holzheu * We do not put the update file on the 'delete' list with 38724bbb1faSMichael Holzheu * hypfs_add_dentry(), since it should not be removed when the tree 38824bbb1faSMichael Holzheu * is updated. 38924bbb1faSMichael Holzheu */ 39024bbb1faSMichael Holzheu return dentry; 39124bbb1faSMichael Holzheu } 39224bbb1faSMichael Holzheu 393a118cfdfSAl Viro struct dentry *hypfs_create_u64(struct dentry *dir, 39424bbb1faSMichael Holzheu const char *name, __u64 value) 39524bbb1faSMichael Holzheu { 39624bbb1faSMichael Holzheu char *buffer; 39724bbb1faSMichael Holzheu char tmp[TMP_SIZE]; 39824bbb1faSMichael Holzheu struct dentry *dentry; 39924bbb1faSMichael Holzheu 400ad2a5d8eSMichael Holzheu snprintf(tmp, TMP_SIZE, "%llu\n", (unsigned long long int)value); 40124bbb1faSMichael Holzheu buffer = kstrdup(tmp, GFP_KERNEL); 40224bbb1faSMichael Holzheu if (!buffer) 40324bbb1faSMichael Holzheu return ERR_PTR(-ENOMEM); 40424bbb1faSMichael Holzheu dentry = 405a118cfdfSAl Viro hypfs_create_file(dir, name, buffer, S_IFREG | REG_FILE_MODE); 40624bbb1faSMichael Holzheu if (IS_ERR(dentry)) { 40724bbb1faSMichael Holzheu kfree(buffer); 40824bbb1faSMichael Holzheu return ERR_PTR(-ENOMEM); 40924bbb1faSMichael Holzheu } 41024bbb1faSMichael Holzheu hypfs_add_dentry(dentry); 41124bbb1faSMichael Holzheu return dentry; 41224bbb1faSMichael Holzheu } 41324bbb1faSMichael Holzheu 414a118cfdfSAl Viro struct dentry *hypfs_create_str(struct dentry *dir, 41524bbb1faSMichael Holzheu const char *name, char *string) 41624bbb1faSMichael Holzheu { 41724bbb1faSMichael Holzheu char *buffer; 41824bbb1faSMichael Holzheu struct dentry *dentry; 41924bbb1faSMichael Holzheu 42024bbb1faSMichael Holzheu buffer = kmalloc(strlen(string) + 2, GFP_KERNEL); 42124bbb1faSMichael Holzheu if (!buffer) 42224bbb1faSMichael Holzheu return ERR_PTR(-ENOMEM); 42324bbb1faSMichael Holzheu sprintf(buffer, "%s\n", string); 42424bbb1faSMichael Holzheu dentry = 425a118cfdfSAl Viro hypfs_create_file(dir, name, buffer, S_IFREG | REG_FILE_MODE); 42624bbb1faSMichael Holzheu if (IS_ERR(dentry)) { 42724bbb1faSMichael Holzheu kfree(buffer); 42824bbb1faSMichael Holzheu return ERR_PTR(-ENOMEM); 42924bbb1faSMichael Holzheu } 43024bbb1faSMichael Holzheu hypfs_add_dentry(dentry); 43124bbb1faSMichael Holzheu return dentry; 43224bbb1faSMichael Holzheu } 43324bbb1faSMichael Holzheu 4345dfe4c96SArjan van de Ven static const struct file_operations hypfs_file_ops = { 43524bbb1faSMichael Holzheu .open = hypfs_open, 43624bbb1faSMichael Holzheu .release = hypfs_release, 437a457ac28SAl Viro .read_iter = hypfs_read_iter, 438a457ac28SAl Viro .write_iter = hypfs_write_iter, 4396038f373SArnd Bergmann .llseek = no_llseek, 44024bbb1faSMichael Holzheu }; 44124bbb1faSMichael Holzheu 44224bbb1faSMichael Holzheu static struct file_system_type hypfs_type = { 44324bbb1faSMichael Holzheu .owner = THIS_MODULE, 44424bbb1faSMichael Holzheu .name = "s390_hypfs", 445fc14f2feSAl Viro .mount = hypfs_mount, 44624bbb1faSMichael Holzheu .kill_sb = hypfs_kill_super 44724bbb1faSMichael Holzheu }; 44824bbb1faSMichael Holzheu 449b87221deSAlexey Dobriyan static const struct super_operations hypfs_s_ops = { 45024bbb1faSMichael Holzheu .statfs = simple_statfs, 451b69257f2SAl Viro .evict_inode = hypfs_evict_inode, 452b01af5baSMichael Holzheu .show_options = hypfs_show_options, 45324bbb1faSMichael Holzheu }; 45424bbb1faSMichael Holzheu 45524bbb1faSMichael Holzheu static int __init hypfs_init(void) 45624bbb1faSMichael Holzheu { 45724bbb1faSMichael Holzheu int rc; 45824bbb1faSMichael Holzheu 459f36108c4SGreg Kroah-Hartman hypfs_dbfs_init(); 460f36108c4SGreg Kroah-Hartman 46124bbb1faSMichael Holzheu if (hypfs_diag_init()) { 46224bbb1faSMichael Holzheu rc = -ENODATA; 4632fcb3686SMichael Holzheu goto fail_dbfs_exit; 46424bbb1faSMichael Holzheu } 46557b28f66SMichael Holzheu if (hypfs_vm_init()) { 46657b28f66SMichael Holzheu rc = -ENODATA; 46757b28f66SMichael Holzheu goto fail_hypfs_diag_exit; 46831cb4bd3SMichael Holzheu } 469f36108c4SGreg Kroah-Hartman hypfs_sprp_init(); 47034c0dad7SMichael Holzheu if (hypfs_diag0c_init()) { 47134c0dad7SMichael Holzheu rc = -ENODATA; 47234c0dad7SMichael Holzheu goto fail_hypfs_sprp_exit; 47334c0dad7SMichael Holzheu } 474f9bb4882SEric W. Biederman rc = sysfs_create_mount_point(hypervisor_kobj, "s390"); 475f9bb4882SEric W. Biederman if (rc) 47634c0dad7SMichael Holzheu goto fail_hypfs_diag0c_exit; 47724bbb1faSMichael Holzheu rc = register_filesystem(&hypfs_type); 47824bbb1faSMichael Holzheu if (rc) 47924bbb1faSMichael Holzheu goto fail_filesystem; 48024bbb1faSMichael Holzheu return 0; 48124bbb1faSMichael Holzheu 48224bbb1faSMichael Holzheu fail_filesystem: 483f9bb4882SEric W. Biederman sysfs_remove_mount_point(hypervisor_kobj, "s390"); 48434c0dad7SMichael Holzheu fail_hypfs_diag0c_exit: 48534c0dad7SMichael Holzheu hypfs_diag0c_exit(); 48607be0382SMartin Schwidefsky fail_hypfs_sprp_exit: 48707be0382SMartin Schwidefsky hypfs_sprp_exit(); 48857b28f66SMichael Holzheu hypfs_vm_exit(); 48957b28f66SMichael Holzheu fail_hypfs_diag_exit: 49024bbb1faSMichael Holzheu hypfs_diag_exit(); 4912fcb3686SMichael Holzheu fail_dbfs_exit: 4922fcb3686SMichael Holzheu hypfs_dbfs_exit(); 493f55495baSMichael Holzheu pr_err("Initialization of hypfs failed with rc=%i\n", rc); 49424bbb1faSMichael Holzheu return rc; 49524bbb1faSMichael Holzheu } 496cee672e1SPaul Gortmaker device_initcall(hypfs_init) 497