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> 158f8d8d11SDavid Howells #include <linux/fs_context.h> 168f8d8d11SDavid Howells #include <linux/fs_parser.h> 1724bbb1faSMichael Holzheu #include <linux/namei.h> 1824bbb1faSMichael Holzheu #include <linux/vfs.h> 195a0e3ad6STejun Heo #include <linux/slab.h> 2024bbb1faSMichael Holzheu #include <linux/pagemap.h> 2124bbb1faSMichael Holzheu #include <linux/time.h> 2224bbb1faSMichael Holzheu #include <linux/sysfs.h> 23cee672e1SPaul Gortmaker #include <linux/init.h> 24cee672e1SPaul Gortmaker #include <linux/kobject.h> 25b01af5baSMichael Holzheu #include <linux/seq_file.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 2108f8d8d11SDavid Howells enum { Opt_uid, Opt_gid, }; 21124bbb1faSMichael Holzheu 212d7167b14SAl Viro static const struct fs_parameter_spec hypfs_fs_parameters[] = { 2138f8d8d11SDavid Howells fsparam_u32("gid", Opt_gid), 2148f8d8d11SDavid Howells fsparam_u32("uid", Opt_uid), 2158f8d8d11SDavid Howells {} 21624bbb1faSMichael Holzheu }; 21724bbb1faSMichael Holzheu 2188f8d8d11SDavid Howells static int hypfs_parse_param(struct fs_context *fc, struct fs_parameter *param) 21924bbb1faSMichael Holzheu { 2208f8d8d11SDavid Howells struct hypfs_sb_info *hypfs_info = fc->s_fs_info; 2218f8d8d11SDavid Howells struct fs_parse_result result; 2226a62a216SEric W. Biederman kuid_t uid; 2236a62a216SEric W. Biederman kgid_t gid; 2248f8d8d11SDavid Howells int opt; 22524bbb1faSMichael Holzheu 226d7167b14SAl Viro opt = fs_parse(fc, hypfs_fs_parameters, param, &result); 2278f8d8d11SDavid Howells if (opt < 0) 2288f8d8d11SDavid Howells return opt; 22924bbb1faSMichael Holzheu 2308f8d8d11SDavid Howells switch (opt) { 2318f8d8d11SDavid Howells case Opt_uid: 2328f8d8d11SDavid Howells uid = make_kuid(current_user_ns(), result.uint_32); 2336a62a216SEric W. Biederman if (!uid_valid(uid)) 2348f8d8d11SDavid Howells return invalf(fc, "Unknown uid"); 2356a62a216SEric W. Biederman hypfs_info->uid = uid; 23624bbb1faSMichael Holzheu break; 2378f8d8d11SDavid Howells case Opt_gid: 2388f8d8d11SDavid Howells gid = make_kgid(current_user_ns(), result.uint_32); 2396a62a216SEric W. Biederman if (!gid_valid(gid)) 2408f8d8d11SDavid Howells return invalf(fc, "Unknown gid"); 2416a62a216SEric W. Biederman hypfs_info->gid = gid; 24224bbb1faSMichael Holzheu break; 24324bbb1faSMichael Holzheu } 24424bbb1faSMichael Holzheu return 0; 24524bbb1faSMichael Holzheu } 24624bbb1faSMichael Holzheu 24734c80b1dSAl Viro static int hypfs_show_options(struct seq_file *s, struct dentry *root) 248b01af5baSMichael Holzheu { 24934c80b1dSAl Viro struct hypfs_sb_info *hypfs_info = root->d_sb->s_fs_info; 250b01af5baSMichael Holzheu 2516a62a216SEric W. Biederman seq_printf(s, ",uid=%u", from_kuid_munged(&init_user_ns, hypfs_info->uid)); 2526a62a216SEric W. Biederman seq_printf(s, ",gid=%u", from_kgid_munged(&init_user_ns, hypfs_info->gid)); 253b01af5baSMichael Holzheu return 0; 254b01af5baSMichael Holzheu } 255b01af5baSMichael Holzheu 2568f8d8d11SDavid Howells static int hypfs_fill_super(struct super_block *sb, struct fs_context *fc) 25724bbb1faSMichael Holzheu { 2588f8d8d11SDavid Howells struct hypfs_sb_info *sbi = sb->s_fs_info; 25924bbb1faSMichael Holzheu struct inode *root_inode; 260b54c64f7SDavid Howells struct dentry *root_dentry, *update_file; 2618f8d8d11SDavid Howells int rc; 26224bbb1faSMichael Holzheu 26309cbfeafSKirill A. Shutemov sb->s_blocksize = PAGE_SIZE; 26409cbfeafSKirill A. Shutemov sb->s_blocksize_bits = PAGE_SHIFT; 26524bbb1faSMichael Holzheu sb->s_magic = HYPFS_MAGIC; 26624bbb1faSMichael Holzheu sb->s_op = &hypfs_s_ops; 2678f8d8d11SDavid Howells 26824bbb1faSMichael Holzheu root_inode = hypfs_make_inode(sb, S_IFDIR | 0755); 269f1771ffaSAl Viro if (!root_inode) 270f1771ffaSAl Viro return -ENOMEM; 27124bbb1faSMichael Holzheu root_inode->i_op = &simple_dir_inode_operations; 27224bbb1faSMichael Holzheu root_inode->i_fop = &simple_dir_operations; 27348fde701SAl Viro sb->s_root = root_dentry = d_make_root(root_inode); 27448fde701SAl Viro if (!root_dentry) 275f1771ffaSAl Viro return -ENOMEM; 27631cb4bd3SMichael Holzheu if (MACHINE_IS_VM) 277f78e41e3SAl Viro rc = hypfs_vm_create_files(root_dentry); 27831cb4bd3SMichael Holzheu else 279e334cf4fSAl Viro rc = hypfs_diag_create_files(root_dentry); 28024bbb1faSMichael Holzheu if (rc) 281f1771ffaSAl Viro return rc; 282b54c64f7SDavid Howells update_file = hypfs_create_update_file(root_dentry); 283b54c64f7SDavid Howells if (IS_ERR(update_file)) 284b54c64f7SDavid Howells return PTR_ERR(update_file); 285b54c64f7SDavid Howells sbi->update_file = update_file; 28624bbb1faSMichael Holzheu hypfs_update_update(sb); 287f55495baSMichael Holzheu pr_info("Hypervisor filesystem mounted\n"); 28824bbb1faSMichael Holzheu return 0; 28924bbb1faSMichael Holzheu } 29024bbb1faSMichael Holzheu 2918f8d8d11SDavid Howells static int hypfs_get_tree(struct fs_context *fc) 29224bbb1faSMichael Holzheu { 2938f8d8d11SDavid Howells return get_tree_single(fc, hypfs_fill_super); 2948f8d8d11SDavid Howells } 2958f8d8d11SDavid Howells 2968f8d8d11SDavid Howells static void hypfs_free_fc(struct fs_context *fc) 2978f8d8d11SDavid Howells { 2988f8d8d11SDavid Howells kfree(fc->s_fs_info); 2998f8d8d11SDavid Howells } 3008f8d8d11SDavid Howells 3018f8d8d11SDavid Howells static const struct fs_context_operations hypfs_context_ops = { 3028f8d8d11SDavid Howells .free = hypfs_free_fc, 3038f8d8d11SDavid Howells .parse_param = hypfs_parse_param, 3048f8d8d11SDavid Howells .get_tree = hypfs_get_tree, 3058f8d8d11SDavid Howells }; 3068f8d8d11SDavid Howells 3078f8d8d11SDavid Howells static int hypfs_init_fs_context(struct fs_context *fc) 3088f8d8d11SDavid Howells { 3098f8d8d11SDavid Howells struct hypfs_sb_info *sbi; 3108f8d8d11SDavid Howells 3118f8d8d11SDavid Howells sbi = kzalloc(sizeof(struct hypfs_sb_info), GFP_KERNEL); 3128f8d8d11SDavid Howells if (!sbi) 3138f8d8d11SDavid Howells return -ENOMEM; 3148f8d8d11SDavid Howells 3158f8d8d11SDavid Howells mutex_init(&sbi->lock); 3168f8d8d11SDavid Howells sbi->uid = current_uid(); 3178f8d8d11SDavid Howells sbi->gid = current_gid(); 3188f8d8d11SDavid Howells 3198f8d8d11SDavid Howells fc->s_fs_info = sbi; 3208f8d8d11SDavid Howells fc->ops = &hypfs_context_ops; 3218f8d8d11SDavid Howells return 0; 32224bbb1faSMichael Holzheu } 32324bbb1faSMichael Holzheu 32424bbb1faSMichael Holzheu static void hypfs_kill_super(struct super_block *sb) 32524bbb1faSMichael Holzheu { 32624bbb1faSMichael Holzheu struct hypfs_sb_info *sb_info = sb->s_fs_info; 32724bbb1faSMichael Holzheu 328f1771ffaSAl Viro if (sb->s_root) 32924bbb1faSMichael Holzheu hypfs_delete_tree(sb->s_root); 330a24cd490SAl Viro if (sb_info && sb_info->update_file) 33124bbb1faSMichael Holzheu hypfs_remove(sb_info->update_file); 33224bbb1faSMichael Holzheu kfree(sb->s_fs_info); 33324bbb1faSMichael Holzheu sb->s_fs_info = NULL; 33424bbb1faSMichael Holzheu kill_litter_super(sb); 33524bbb1faSMichael Holzheu } 33624bbb1faSMichael Holzheu 337a118cfdfSAl Viro static struct dentry *hypfs_create_file(struct dentry *parent, const char *name, 338fec0ebaeSAl Viro char *data, umode_t mode) 33924bbb1faSMichael Holzheu { 34024bbb1faSMichael Holzheu struct dentry *dentry; 34124bbb1faSMichael Holzheu struct inode *inode; 34224bbb1faSMichael Holzheu 3435955102cSAl Viro inode_lock(d_inode(parent)); 34424bbb1faSMichael Holzheu dentry = lookup_one_len(name, parent, strlen(name)); 3459b5a03e1SMichael Holzheu if (IS_ERR(dentry)) { 3469b5a03e1SMichael Holzheu dentry = ERR_PTR(-ENOMEM); 3479b5a03e1SMichael Holzheu goto fail; 3489b5a03e1SMichael Holzheu } 349a118cfdfSAl Viro inode = hypfs_make_inode(parent->d_sb, mode); 35024bbb1faSMichael Holzheu if (!inode) { 35124bbb1faSMichael Holzheu dput(dentry); 3529b5a03e1SMichael Holzheu dentry = ERR_PTR(-ENOMEM); 3539b5a03e1SMichael Holzheu goto fail; 35424bbb1faSMichael Holzheu } 355fec0ebaeSAl Viro if (S_ISREG(mode)) { 35624bbb1faSMichael Holzheu inode->i_fop = &hypfs_file_ops; 35724bbb1faSMichael Holzheu if (data) 35824bbb1faSMichael Holzheu inode->i_size = strlen(data); 35924bbb1faSMichael Holzheu else 36024bbb1faSMichael Holzheu inode->i_size = 0; 361fec0ebaeSAl Viro } else if (S_ISDIR(mode)) { 36224bbb1faSMichael Holzheu inode->i_op = &simple_dir_inode_operations; 36324bbb1faSMichael Holzheu inode->i_fop = &simple_dir_operations; 36475c3cfa8SDavid Howells inc_nlink(d_inode(parent)); 36524bbb1faSMichael Holzheu } else 36624bbb1faSMichael Holzheu BUG(); 3678e18e294STheodore Ts'o inode->i_private = data; 36824bbb1faSMichael Holzheu d_instantiate(dentry, inode); 36924bbb1faSMichael Holzheu dget(dentry); 3709b5a03e1SMichael Holzheu fail: 3715955102cSAl Viro inode_unlock(d_inode(parent)); 37224bbb1faSMichael Holzheu return dentry; 37324bbb1faSMichael Holzheu } 37424bbb1faSMichael Holzheu 375a118cfdfSAl Viro struct dentry *hypfs_mkdir(struct dentry *parent, const char *name) 37624bbb1faSMichael Holzheu { 37724bbb1faSMichael Holzheu struct dentry *dentry; 37824bbb1faSMichael Holzheu 379a118cfdfSAl Viro dentry = hypfs_create_file(parent, name, NULL, S_IFDIR | DIR_MODE); 38024bbb1faSMichael Holzheu if (IS_ERR(dentry)) 38124bbb1faSMichael Holzheu return dentry; 38224bbb1faSMichael Holzheu hypfs_add_dentry(dentry); 38324bbb1faSMichael Holzheu return dentry; 38424bbb1faSMichael Holzheu } 38524bbb1faSMichael Holzheu 386a118cfdfSAl Viro static struct dentry *hypfs_create_update_file(struct dentry *dir) 38724bbb1faSMichael Holzheu { 38824bbb1faSMichael Holzheu struct dentry *dentry; 38924bbb1faSMichael Holzheu 390a118cfdfSAl Viro dentry = hypfs_create_file(dir, "update", NULL, 39124bbb1faSMichael Holzheu S_IFREG | UPDATE_FILE_MODE); 39224bbb1faSMichael Holzheu /* 39324bbb1faSMichael Holzheu * We do not put the update file on the 'delete' list with 39424bbb1faSMichael Holzheu * hypfs_add_dentry(), since it should not be removed when the tree 39524bbb1faSMichael Holzheu * is updated. 39624bbb1faSMichael Holzheu */ 39724bbb1faSMichael Holzheu return dentry; 39824bbb1faSMichael Holzheu } 39924bbb1faSMichael Holzheu 400a118cfdfSAl Viro struct dentry *hypfs_create_u64(struct dentry *dir, 40124bbb1faSMichael Holzheu const char *name, __u64 value) 40224bbb1faSMichael Holzheu { 40324bbb1faSMichael Holzheu char *buffer; 40424bbb1faSMichael Holzheu char tmp[TMP_SIZE]; 40524bbb1faSMichael Holzheu struct dentry *dentry; 40624bbb1faSMichael Holzheu 407ad2a5d8eSMichael Holzheu snprintf(tmp, TMP_SIZE, "%llu\n", (unsigned long long int)value); 40824bbb1faSMichael Holzheu buffer = kstrdup(tmp, GFP_KERNEL); 40924bbb1faSMichael Holzheu if (!buffer) 41024bbb1faSMichael Holzheu return ERR_PTR(-ENOMEM); 41124bbb1faSMichael Holzheu dentry = 412a118cfdfSAl Viro hypfs_create_file(dir, name, buffer, S_IFREG | REG_FILE_MODE); 41324bbb1faSMichael Holzheu if (IS_ERR(dentry)) { 41424bbb1faSMichael Holzheu kfree(buffer); 41524bbb1faSMichael Holzheu return ERR_PTR(-ENOMEM); 41624bbb1faSMichael Holzheu } 41724bbb1faSMichael Holzheu hypfs_add_dentry(dentry); 41824bbb1faSMichael Holzheu return dentry; 41924bbb1faSMichael Holzheu } 42024bbb1faSMichael Holzheu 421a118cfdfSAl Viro struct dentry *hypfs_create_str(struct dentry *dir, 42224bbb1faSMichael Holzheu const char *name, char *string) 42324bbb1faSMichael Holzheu { 42424bbb1faSMichael Holzheu char *buffer; 42524bbb1faSMichael Holzheu struct dentry *dentry; 42624bbb1faSMichael Holzheu 42724bbb1faSMichael Holzheu buffer = kmalloc(strlen(string) + 2, GFP_KERNEL); 42824bbb1faSMichael Holzheu if (!buffer) 42924bbb1faSMichael Holzheu return ERR_PTR(-ENOMEM); 43024bbb1faSMichael Holzheu sprintf(buffer, "%s\n", string); 43124bbb1faSMichael Holzheu dentry = 432a118cfdfSAl Viro hypfs_create_file(dir, name, buffer, S_IFREG | REG_FILE_MODE); 43324bbb1faSMichael Holzheu if (IS_ERR(dentry)) { 43424bbb1faSMichael Holzheu kfree(buffer); 43524bbb1faSMichael Holzheu return ERR_PTR(-ENOMEM); 43624bbb1faSMichael Holzheu } 43724bbb1faSMichael Holzheu hypfs_add_dentry(dentry); 43824bbb1faSMichael Holzheu return dentry; 43924bbb1faSMichael Holzheu } 44024bbb1faSMichael Holzheu 4415dfe4c96SArjan van de Ven static const struct file_operations hypfs_file_ops = { 44224bbb1faSMichael Holzheu .open = hypfs_open, 44324bbb1faSMichael Holzheu .release = hypfs_release, 444a457ac28SAl Viro .read_iter = hypfs_read_iter, 445a457ac28SAl Viro .write_iter = hypfs_write_iter, 4466038f373SArnd Bergmann .llseek = no_llseek, 44724bbb1faSMichael Holzheu }; 44824bbb1faSMichael Holzheu 44924bbb1faSMichael Holzheu static struct file_system_type hypfs_type = { 45024bbb1faSMichael Holzheu .owner = THIS_MODULE, 45124bbb1faSMichael Holzheu .name = "s390_hypfs", 4528f8d8d11SDavid Howells .init_fs_context = hypfs_init_fs_context, 453d7167b14SAl Viro .parameters = hypfs_fs_parameters, 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 46324bbb1faSMichael Holzheu static int __init hypfs_init(void) 46424bbb1faSMichael Holzheu { 46524bbb1faSMichael Holzheu int rc; 46624bbb1faSMichael Holzheu 467f36108c4SGreg Kroah-Hartman hypfs_dbfs_init(); 468f36108c4SGreg Kroah-Hartman 46924bbb1faSMichael Holzheu if (hypfs_diag_init()) { 47024bbb1faSMichael Holzheu rc = -ENODATA; 4712fcb3686SMichael Holzheu goto fail_dbfs_exit; 47224bbb1faSMichael Holzheu } 47357b28f66SMichael Holzheu if (hypfs_vm_init()) { 47457b28f66SMichael Holzheu rc = -ENODATA; 47557b28f66SMichael Holzheu goto fail_hypfs_diag_exit; 47631cb4bd3SMichael Holzheu } 477f36108c4SGreg Kroah-Hartman hypfs_sprp_init(); 47834c0dad7SMichael Holzheu if (hypfs_diag0c_init()) { 47934c0dad7SMichael Holzheu rc = -ENODATA; 48034c0dad7SMichael Holzheu goto fail_hypfs_sprp_exit; 48134c0dad7SMichael Holzheu } 482f9bb4882SEric W. Biederman rc = sysfs_create_mount_point(hypervisor_kobj, "s390"); 483f9bb4882SEric W. Biederman if (rc) 48434c0dad7SMichael Holzheu goto fail_hypfs_diag0c_exit; 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: 491f9bb4882SEric W. Biederman sysfs_remove_mount_point(hypervisor_kobj, "s390"); 49234c0dad7SMichael Holzheu fail_hypfs_diag0c_exit: 49334c0dad7SMichael Holzheu hypfs_diag0c_exit(); 49407be0382SMartin Schwidefsky fail_hypfs_sprp_exit: 49507be0382SMartin Schwidefsky hypfs_sprp_exit(); 49657b28f66SMichael Holzheu hypfs_vm_exit(); 49757b28f66SMichael Holzheu fail_hypfs_diag_exit: 49824bbb1faSMichael Holzheu hypfs_diag_exit(); 4992fcb3686SMichael Holzheu fail_dbfs_exit: 5002fcb3686SMichael Holzheu hypfs_dbfs_exit(); 501f55495baSMichael Holzheu pr_err("Initialization of hypfs failed with rc=%i\n", rc); 50224bbb1faSMichael Holzheu return rc; 50324bbb1faSMichael Holzheu } 504cee672e1SPaul Gortmaker device_initcall(hypfs_init) 505