124bbb1faSMichael Holzheu /* 224bbb1faSMichael Holzheu * Hypervisor filesystem for Linux on s390. 324bbb1faSMichael Holzheu * 4f55495baSMichael Holzheu * Copyright IBM Corp. 2006, 2008 524bbb1faSMichael Holzheu * Author(s): Michael Holzheu <holzheu@de.ibm.com> 624bbb1faSMichael Holzheu */ 724bbb1faSMichael Holzheu 8f55495baSMichael Holzheu #define KMSG_COMPONENT "hypfs" 9f55495baSMichael Holzheu #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 10f55495baSMichael Holzheu 1124bbb1faSMichael Holzheu #include <linux/types.h> 1224bbb1faSMichael Holzheu #include <linux/errno.h> 1324bbb1faSMichael Holzheu #include <linux/fs.h> 1424bbb1faSMichael Holzheu #include <linux/namei.h> 1524bbb1faSMichael Holzheu #include <linux/vfs.h> 165a0e3ad6STejun Heo #include <linux/slab.h> 1724bbb1faSMichael Holzheu #include <linux/pagemap.h> 1824bbb1faSMichael Holzheu #include <linux/time.h> 1924bbb1faSMichael Holzheu #include <linux/parser.h> 2024bbb1faSMichael Holzheu #include <linux/sysfs.h> 2124bbb1faSMichael Holzheu #include <linux/module.h> 22b01af5baSMichael Holzheu #include <linux/seq_file.h> 23b01af5baSMichael Holzheu #include <linux/mount.h> 24e2e40f2cSChristoph Hellwig #include <linux/uio.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 31a118cfdfSAl Viro static struct dentry *hypfs_create_update_file(struct dentry *dir); 3224bbb1faSMichael Holzheu 3324bbb1faSMichael Holzheu struct hypfs_sb_info { 346a62a216SEric W. Biederman kuid_t uid; /* uid used for files and dirs */ 356a62a216SEric W. Biederman kgid_t gid; /* gid used for files and dirs */ 3624bbb1faSMichael Holzheu struct dentry *update_file; /* file to trigger update */ 3724bbb1faSMichael Holzheu time_t last_update; /* last update time in secs since 1970 */ 3824bbb1faSMichael Holzheu struct mutex lock; /* lock to protect update process */ 3924bbb1faSMichael Holzheu }; 4024bbb1faSMichael Holzheu 415dfe4c96SArjan van de Ven static const struct file_operations hypfs_file_ops; 4224bbb1faSMichael Holzheu static struct file_system_type hypfs_type; 43b87221deSAlexey Dobriyan static const struct super_operations hypfs_s_ops; 4424bbb1faSMichael Holzheu 4524bbb1faSMichael Holzheu /* start of list of all dentries, which have to be deleted on update */ 4624bbb1faSMichael Holzheu static struct dentry *hypfs_last_dentry; 4724bbb1faSMichael Holzheu 4824bbb1faSMichael Holzheu static void hypfs_update_update(struct super_block *sb) 4924bbb1faSMichael Holzheu { 5024bbb1faSMichael Holzheu struct hypfs_sb_info *sb_info = sb->s_fs_info; 5175c3cfa8SDavid Howells struct inode *inode = d_inode(sb_info->update_file); 5224bbb1faSMichael Holzheu 5324bbb1faSMichael Holzheu sb_info->last_update = get_seconds(); 5424bbb1faSMichael Holzheu inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 5524bbb1faSMichael Holzheu } 5624bbb1faSMichael Holzheu 5724bbb1faSMichael Holzheu /* directory tree removal functions */ 5824bbb1faSMichael Holzheu 5924bbb1faSMichael Holzheu static void hypfs_add_dentry(struct dentry *dentry) 6024bbb1faSMichael Holzheu { 6124bbb1faSMichael Holzheu dentry->d_fsdata = hypfs_last_dentry; 6224bbb1faSMichael Holzheu hypfs_last_dentry = dentry; 6324bbb1faSMichael Holzheu } 6424bbb1faSMichael Holzheu 6524bbb1faSMichael Holzheu static void hypfs_remove(struct dentry *dentry) 6624bbb1faSMichael Holzheu { 6724bbb1faSMichael Holzheu struct dentry *parent; 6824bbb1faSMichael Holzheu 6924bbb1faSMichael Holzheu parent = dentry->d_parent; 7075c3cfa8SDavid Howells mutex_lock(&d_inode(parent)->i_mutex); 71dc3f4198SAl Viro if (simple_positive(dentry)) { 72e36cb0b8SDavid Howells if (d_is_dir(dentry)) 7375c3cfa8SDavid Howells simple_rmdir(d_inode(parent), dentry); 7424bbb1faSMichael Holzheu else 7575c3cfa8SDavid Howells simple_unlink(d_inode(parent), dentry); 769b5a03e1SMichael Holzheu } 7724bbb1faSMichael Holzheu d_delete(dentry); 7824bbb1faSMichael Holzheu dput(dentry); 7975c3cfa8SDavid Howells mutex_unlock(&d_inode(parent)->i_mutex); 8024bbb1faSMichael Holzheu } 8124bbb1faSMichael Holzheu 8224bbb1faSMichael Holzheu static void hypfs_delete_tree(struct dentry *root) 8324bbb1faSMichael Holzheu { 8424bbb1faSMichael Holzheu while (hypfs_last_dentry) { 8524bbb1faSMichael Holzheu struct dentry *next_dentry; 8624bbb1faSMichael Holzheu next_dentry = hypfs_last_dentry->d_fsdata; 8724bbb1faSMichael Holzheu hypfs_remove(hypfs_last_dentry); 8824bbb1faSMichael Holzheu hypfs_last_dentry = next_dentry; 8924bbb1faSMichael Holzheu } 9024bbb1faSMichael Holzheu } 9124bbb1faSMichael Holzheu 92fec0ebaeSAl Viro static struct inode *hypfs_make_inode(struct super_block *sb, umode_t mode) 9324bbb1faSMichael Holzheu { 9424bbb1faSMichael Holzheu struct inode *ret = new_inode(sb); 9524bbb1faSMichael Holzheu 9624bbb1faSMichael Holzheu if (ret) { 9724bbb1faSMichael Holzheu struct hypfs_sb_info *hypfs_info = sb->s_fs_info; 98c960bec4SMichael Holzheu ret->i_ino = get_next_ino(); 9924bbb1faSMichael Holzheu ret->i_mode = mode; 10024bbb1faSMichael Holzheu ret->i_uid = hypfs_info->uid; 10124bbb1faSMichael Holzheu ret->i_gid = hypfs_info->gid; 10224bbb1faSMichael Holzheu ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME; 103fec0ebaeSAl Viro if (S_ISDIR(mode)) 104bfe86848SMiklos Szeredi set_nlink(ret, 2); 10524bbb1faSMichael Holzheu } 10624bbb1faSMichael Holzheu return ret; 10724bbb1faSMichael Holzheu } 10824bbb1faSMichael Holzheu 109b69257f2SAl Viro static void hypfs_evict_inode(struct inode *inode) 11024bbb1faSMichael Holzheu { 111dbd5768fSJan Kara clear_inode(inode); 1128e18e294STheodore Ts'o kfree(inode->i_private); 11324bbb1faSMichael Holzheu } 11424bbb1faSMichael Holzheu 11524bbb1faSMichael Holzheu static int hypfs_open(struct inode *inode, struct file *filp) 11624bbb1faSMichael Holzheu { 117496ad9aaSAl Viro char *data = file_inode(filp)->i_private; 11824bbb1faSMichael Holzheu struct hypfs_sb_info *fs_info; 11924bbb1faSMichael Holzheu 12024bbb1faSMichael Holzheu if (filp->f_mode & FMODE_WRITE) { 12124bbb1faSMichael Holzheu if (!(inode->i_mode & S_IWUGO)) 12224bbb1faSMichael Holzheu return -EACCES; 12324bbb1faSMichael Holzheu } 12424bbb1faSMichael Holzheu if (filp->f_mode & FMODE_READ) { 12524bbb1faSMichael Holzheu if (!(inode->i_mode & S_IRUGO)) 12624bbb1faSMichael Holzheu return -EACCES; 12724bbb1faSMichael Holzheu } 12824bbb1faSMichael Holzheu 12924bbb1faSMichael Holzheu fs_info = inode->i_sb->s_fs_info; 13024bbb1faSMichael Holzheu if(data) { 13124bbb1faSMichael Holzheu mutex_lock(&fs_info->lock); 13224bbb1faSMichael Holzheu filp->private_data = kstrdup(data, GFP_KERNEL); 13324bbb1faSMichael Holzheu if (!filp->private_data) { 13424bbb1faSMichael Holzheu mutex_unlock(&fs_info->lock); 13524bbb1faSMichael Holzheu return -ENOMEM; 13624bbb1faSMichael Holzheu } 13724bbb1faSMichael Holzheu mutex_unlock(&fs_info->lock); 13824bbb1faSMichael Holzheu } 13958ea91c0SMartin Schwidefsky return nonseekable_open(inode, filp); 14024bbb1faSMichael Holzheu } 14124bbb1faSMichael Holzheu 142a457ac28SAl Viro static ssize_t hypfs_read_iter(struct kiocb *iocb, struct iov_iter *to) 14324bbb1faSMichael Holzheu { 144a457ac28SAl Viro struct file *file = iocb->ki_filp; 145a457ac28SAl Viro char *data = file->private_data; 146a457ac28SAl Viro size_t available = strlen(data); 147a457ac28SAl Viro loff_t pos = iocb->ki_pos; 148a457ac28SAl Viro size_t count; 149027445c3SBadari Pulavarty 150a457ac28SAl Viro if (pos < 0) 151a29591c4SAkinobu Mita return -EINVAL; 152a457ac28SAl Viro if (pos >= available || !iov_iter_count(to)) 153a457ac28SAl Viro return 0; 154a457ac28SAl Viro count = copy_to_iter(data + pos, available - pos, to); 155a457ac28SAl Viro if (!count) 156a457ac28SAl Viro return -EFAULT; 157a457ac28SAl Viro iocb->ki_pos = pos + count; 158a457ac28SAl Viro file_accessed(file); 159a457ac28SAl Viro return count; 16024bbb1faSMichael Holzheu } 161a457ac28SAl Viro 162a457ac28SAl Viro static ssize_t hypfs_write_iter(struct kiocb *iocb, struct iov_iter *from) 16324bbb1faSMichael Holzheu { 16424bbb1faSMichael Holzheu int rc; 1656131ffaaSAl Viro struct super_block *sb = file_inode(iocb->ki_filp)->i_sb; 1666131ffaaSAl Viro struct hypfs_sb_info *fs_info = sb->s_fs_info; 167a457ac28SAl Viro size_t count = iov_iter_count(from); 16824bbb1faSMichael Holzheu 16924bbb1faSMichael Holzheu /* 17024bbb1faSMichael Holzheu * Currently we only allow one update per second for two reasons: 17124bbb1faSMichael Holzheu * 1. diag 204 is VERY expensive 17224bbb1faSMichael Holzheu * 2. If several processes do updates in parallel and then read the 17324bbb1faSMichael Holzheu * hypfs data, the likelihood of collisions is reduced, if we restrict 17424bbb1faSMichael Holzheu * the minimum update interval. A collision occurs, if during the 17524bbb1faSMichael Holzheu * data gathering of one process another process triggers an update 17624bbb1faSMichael Holzheu * If the first process wants to ensure consistent data, it has 17724bbb1faSMichael Holzheu * to restart data collection in this case. 17824bbb1faSMichael Holzheu */ 17924bbb1faSMichael Holzheu mutex_lock(&fs_info->lock); 18024bbb1faSMichael Holzheu if (fs_info->last_update == get_seconds()) { 18124bbb1faSMichael Holzheu rc = -EBUSY; 18224bbb1faSMichael Holzheu goto out; 18324bbb1faSMichael Holzheu } 18424bbb1faSMichael Holzheu hypfs_delete_tree(sb->s_root); 18531cb4bd3SMichael Holzheu if (MACHINE_IS_VM) 186f78e41e3SAl Viro rc = hypfs_vm_create_files(sb->s_root); 18731cb4bd3SMichael Holzheu else 188e334cf4fSAl Viro rc = hypfs_diag_create_files(sb->s_root); 18924bbb1faSMichael Holzheu if (rc) { 190f55495baSMichael Holzheu pr_err("Updating the hypfs tree failed\n"); 19124bbb1faSMichael Holzheu hypfs_delete_tree(sb->s_root); 19224bbb1faSMichael Holzheu goto out; 19324bbb1faSMichael Holzheu } 19424bbb1faSMichael Holzheu hypfs_update_update(sb); 19524bbb1faSMichael Holzheu rc = count; 196a457ac28SAl Viro iov_iter_advance(from, count); 19724bbb1faSMichael Holzheu out: 19824bbb1faSMichael Holzheu mutex_unlock(&fs_info->lock); 19924bbb1faSMichael Holzheu return rc; 20024bbb1faSMichael Holzheu } 20124bbb1faSMichael Holzheu 20224bbb1faSMichael Holzheu static int hypfs_release(struct inode *inode, struct file *filp) 20324bbb1faSMichael Holzheu { 20424bbb1faSMichael Holzheu kfree(filp->private_data); 20524bbb1faSMichael Holzheu return 0; 20624bbb1faSMichael Holzheu } 20724bbb1faSMichael Holzheu 20824bbb1faSMichael Holzheu enum { opt_uid, opt_gid, opt_err }; 20924bbb1faSMichael Holzheu 210a447c093SSteven Whitehouse static const match_table_t hypfs_tokens = { 21124bbb1faSMichael Holzheu {opt_uid, "uid=%u"}, 21224bbb1faSMichael Holzheu {opt_gid, "gid=%u"}, 21324bbb1faSMichael Holzheu {opt_err, NULL} 21424bbb1faSMichael Holzheu }; 21524bbb1faSMichael Holzheu 21624bbb1faSMichael Holzheu static int hypfs_parse_options(char *options, struct super_block *sb) 21724bbb1faSMichael Holzheu { 21824bbb1faSMichael Holzheu char *str; 21924bbb1faSMichael Holzheu substring_t args[MAX_OPT_ARGS]; 2206a62a216SEric W. Biederman kuid_t uid; 2216a62a216SEric W. Biederman kgid_t gid; 22224bbb1faSMichael Holzheu 22324bbb1faSMichael Holzheu if (!options) 22424bbb1faSMichael Holzheu return 0; 22524bbb1faSMichael Holzheu while ((str = strsep(&options, ",")) != NULL) { 22624bbb1faSMichael Holzheu int token, option; 22724bbb1faSMichael Holzheu struct hypfs_sb_info *hypfs_info = sb->s_fs_info; 22824bbb1faSMichael Holzheu 22924bbb1faSMichael Holzheu if (!*str) 23024bbb1faSMichael Holzheu continue; 23124bbb1faSMichael Holzheu token = match_token(str, hypfs_tokens, args); 23224bbb1faSMichael Holzheu switch (token) { 23324bbb1faSMichael Holzheu case opt_uid: 23424bbb1faSMichael Holzheu if (match_int(&args[0], &option)) 23524bbb1faSMichael Holzheu return -EINVAL; 2366a62a216SEric W. Biederman uid = make_kuid(current_user_ns(), option); 2376a62a216SEric W. Biederman if (!uid_valid(uid)) 2386a62a216SEric W. Biederman return -EINVAL; 2396a62a216SEric W. Biederman hypfs_info->uid = uid; 24024bbb1faSMichael Holzheu break; 24124bbb1faSMichael Holzheu case opt_gid: 24224bbb1faSMichael Holzheu if (match_int(&args[0], &option)) 24324bbb1faSMichael Holzheu return -EINVAL; 2446a62a216SEric W. Biederman gid = make_kgid(current_user_ns(), option); 2456a62a216SEric W. Biederman if (!gid_valid(gid)) 2466a62a216SEric W. Biederman return -EINVAL; 2476a62a216SEric W. Biederman hypfs_info->gid = gid; 24824bbb1faSMichael Holzheu break; 24924bbb1faSMichael Holzheu case opt_err: 25024bbb1faSMichael Holzheu default: 251f55495baSMichael Holzheu pr_err("%s is not a valid mount option\n", str); 25224bbb1faSMichael Holzheu return -EINVAL; 25324bbb1faSMichael Holzheu } 25424bbb1faSMichael Holzheu } 25524bbb1faSMichael Holzheu return 0; 25624bbb1faSMichael Holzheu } 25724bbb1faSMichael Holzheu 25834c80b1dSAl Viro static int hypfs_show_options(struct seq_file *s, struct dentry *root) 259b01af5baSMichael Holzheu { 26034c80b1dSAl Viro struct hypfs_sb_info *hypfs_info = root->d_sb->s_fs_info; 261b01af5baSMichael Holzheu 2626a62a216SEric W. Biederman seq_printf(s, ",uid=%u", from_kuid_munged(&init_user_ns, hypfs_info->uid)); 2636a62a216SEric W. Biederman seq_printf(s, ",gid=%u", from_kgid_munged(&init_user_ns, hypfs_info->gid)); 264b01af5baSMichael Holzheu return 0; 265b01af5baSMichael Holzheu } 266b01af5baSMichael Holzheu 26724bbb1faSMichael Holzheu static int hypfs_fill_super(struct super_block *sb, void *data, int silent) 26824bbb1faSMichael Holzheu { 26924bbb1faSMichael Holzheu struct inode *root_inode; 27024bbb1faSMichael Holzheu struct dentry *root_dentry; 27124bbb1faSMichael Holzheu int rc = 0; 27224bbb1faSMichael Holzheu struct hypfs_sb_info *sbi; 27324bbb1faSMichael Holzheu 27424bbb1faSMichael Holzheu sbi = kzalloc(sizeof(struct hypfs_sb_info), GFP_KERNEL); 27524bbb1faSMichael Holzheu if (!sbi) 27624bbb1faSMichael Holzheu return -ENOMEM; 27724bbb1faSMichael Holzheu mutex_init(&sbi->lock); 278e5423705SDavid Howells sbi->uid = current_uid(); 279e5423705SDavid Howells sbi->gid = current_gid(); 28024bbb1faSMichael Holzheu sb->s_fs_info = sbi; 28124bbb1faSMichael Holzheu sb->s_blocksize = PAGE_CACHE_SIZE; 28224bbb1faSMichael Holzheu sb->s_blocksize_bits = PAGE_CACHE_SHIFT; 28324bbb1faSMichael Holzheu sb->s_magic = HYPFS_MAGIC; 28424bbb1faSMichael Holzheu sb->s_op = &hypfs_s_ops; 285f1771ffaSAl Viro if (hypfs_parse_options(data, sb)) 286f1771ffaSAl Viro return -EINVAL; 28724bbb1faSMichael Holzheu root_inode = hypfs_make_inode(sb, S_IFDIR | 0755); 288f1771ffaSAl Viro if (!root_inode) 289f1771ffaSAl Viro return -ENOMEM; 29024bbb1faSMichael Holzheu root_inode->i_op = &simple_dir_inode_operations; 29124bbb1faSMichael Holzheu root_inode->i_fop = &simple_dir_operations; 29248fde701SAl Viro sb->s_root = root_dentry = d_make_root(root_inode); 29348fde701SAl Viro if (!root_dentry) 294f1771ffaSAl Viro return -ENOMEM; 29531cb4bd3SMichael Holzheu if (MACHINE_IS_VM) 296f78e41e3SAl Viro rc = hypfs_vm_create_files(root_dentry); 29731cb4bd3SMichael Holzheu else 298e334cf4fSAl Viro rc = hypfs_diag_create_files(root_dentry); 29924bbb1faSMichael Holzheu if (rc) 300f1771ffaSAl Viro return rc; 301a118cfdfSAl Viro sbi->update_file = hypfs_create_update_file(root_dentry); 302f1771ffaSAl Viro if (IS_ERR(sbi->update_file)) 303f1771ffaSAl Viro return PTR_ERR(sbi->update_file); 30424bbb1faSMichael Holzheu hypfs_update_update(sb); 305f55495baSMichael Holzheu pr_info("Hypervisor filesystem mounted\n"); 30624bbb1faSMichael Holzheu return 0; 30724bbb1faSMichael Holzheu } 30824bbb1faSMichael Holzheu 309fc14f2feSAl Viro static struct dentry *hypfs_mount(struct file_system_type *fst, int flags, 310fc14f2feSAl Viro const char *devname, void *data) 31124bbb1faSMichael Holzheu { 312fc14f2feSAl Viro return mount_single(fst, flags, data, hypfs_fill_super); 31324bbb1faSMichael Holzheu } 31424bbb1faSMichael Holzheu 31524bbb1faSMichael Holzheu static void hypfs_kill_super(struct super_block *sb) 31624bbb1faSMichael Holzheu { 31724bbb1faSMichael Holzheu struct hypfs_sb_info *sb_info = sb->s_fs_info; 31824bbb1faSMichael Holzheu 319f1771ffaSAl Viro if (sb->s_root) 32024bbb1faSMichael Holzheu hypfs_delete_tree(sb->s_root); 321f1771ffaSAl Viro if (sb_info->update_file) 32224bbb1faSMichael Holzheu hypfs_remove(sb_info->update_file); 32324bbb1faSMichael Holzheu kfree(sb->s_fs_info); 32424bbb1faSMichael Holzheu sb->s_fs_info = NULL; 32524bbb1faSMichael Holzheu kill_litter_super(sb); 32624bbb1faSMichael Holzheu } 32724bbb1faSMichael Holzheu 328a118cfdfSAl Viro static struct dentry *hypfs_create_file(struct dentry *parent, const char *name, 329fec0ebaeSAl Viro char *data, umode_t mode) 33024bbb1faSMichael Holzheu { 33124bbb1faSMichael Holzheu struct dentry *dentry; 33224bbb1faSMichael Holzheu struct inode *inode; 33324bbb1faSMichael Holzheu 33475c3cfa8SDavid Howells mutex_lock(&d_inode(parent)->i_mutex); 33524bbb1faSMichael Holzheu dentry = lookup_one_len(name, parent, strlen(name)); 3369b5a03e1SMichael Holzheu if (IS_ERR(dentry)) { 3379b5a03e1SMichael Holzheu dentry = ERR_PTR(-ENOMEM); 3389b5a03e1SMichael Holzheu goto fail; 3399b5a03e1SMichael Holzheu } 340a118cfdfSAl Viro inode = hypfs_make_inode(parent->d_sb, mode); 34124bbb1faSMichael Holzheu if (!inode) { 34224bbb1faSMichael Holzheu dput(dentry); 3439b5a03e1SMichael Holzheu dentry = ERR_PTR(-ENOMEM); 3449b5a03e1SMichael Holzheu goto fail; 34524bbb1faSMichael Holzheu } 346fec0ebaeSAl Viro if (S_ISREG(mode)) { 34724bbb1faSMichael Holzheu inode->i_fop = &hypfs_file_ops; 34824bbb1faSMichael Holzheu if (data) 34924bbb1faSMichael Holzheu inode->i_size = strlen(data); 35024bbb1faSMichael Holzheu else 35124bbb1faSMichael Holzheu inode->i_size = 0; 352fec0ebaeSAl Viro } else if (S_ISDIR(mode)) { 35324bbb1faSMichael Holzheu inode->i_op = &simple_dir_inode_operations; 35424bbb1faSMichael Holzheu inode->i_fop = &simple_dir_operations; 35575c3cfa8SDavid Howells inc_nlink(d_inode(parent)); 35624bbb1faSMichael Holzheu } else 35724bbb1faSMichael Holzheu BUG(); 3588e18e294STheodore Ts'o inode->i_private = data; 35924bbb1faSMichael Holzheu d_instantiate(dentry, inode); 36024bbb1faSMichael Holzheu dget(dentry); 3619b5a03e1SMichael Holzheu fail: 36275c3cfa8SDavid Howells mutex_unlock(&d_inode(parent)->i_mutex); 36324bbb1faSMichael Holzheu return dentry; 36424bbb1faSMichael Holzheu } 36524bbb1faSMichael Holzheu 366a118cfdfSAl Viro struct dentry *hypfs_mkdir(struct dentry *parent, const char *name) 36724bbb1faSMichael Holzheu { 36824bbb1faSMichael Holzheu struct dentry *dentry; 36924bbb1faSMichael Holzheu 370a118cfdfSAl Viro dentry = hypfs_create_file(parent, name, NULL, S_IFDIR | DIR_MODE); 37124bbb1faSMichael Holzheu if (IS_ERR(dentry)) 37224bbb1faSMichael Holzheu return dentry; 37324bbb1faSMichael Holzheu hypfs_add_dentry(dentry); 37424bbb1faSMichael Holzheu return dentry; 37524bbb1faSMichael Holzheu } 37624bbb1faSMichael Holzheu 377a118cfdfSAl Viro static struct dentry *hypfs_create_update_file(struct dentry *dir) 37824bbb1faSMichael Holzheu { 37924bbb1faSMichael Holzheu struct dentry *dentry; 38024bbb1faSMichael Holzheu 381a118cfdfSAl Viro dentry = hypfs_create_file(dir, "update", NULL, 38224bbb1faSMichael Holzheu S_IFREG | UPDATE_FILE_MODE); 38324bbb1faSMichael Holzheu /* 38424bbb1faSMichael Holzheu * We do not put the update file on the 'delete' list with 38524bbb1faSMichael Holzheu * hypfs_add_dentry(), since it should not be removed when the tree 38624bbb1faSMichael Holzheu * is updated. 38724bbb1faSMichael Holzheu */ 38824bbb1faSMichael Holzheu return dentry; 38924bbb1faSMichael Holzheu } 39024bbb1faSMichael Holzheu 391a118cfdfSAl Viro struct dentry *hypfs_create_u64(struct dentry *dir, 39224bbb1faSMichael Holzheu const char *name, __u64 value) 39324bbb1faSMichael Holzheu { 39424bbb1faSMichael Holzheu char *buffer; 39524bbb1faSMichael Holzheu char tmp[TMP_SIZE]; 39624bbb1faSMichael Holzheu struct dentry *dentry; 39724bbb1faSMichael Holzheu 398ad2a5d8eSMichael Holzheu snprintf(tmp, TMP_SIZE, "%llu\n", (unsigned long long int)value); 39924bbb1faSMichael Holzheu buffer = kstrdup(tmp, GFP_KERNEL); 40024bbb1faSMichael Holzheu if (!buffer) 40124bbb1faSMichael Holzheu return ERR_PTR(-ENOMEM); 40224bbb1faSMichael Holzheu dentry = 403a118cfdfSAl Viro hypfs_create_file(dir, name, buffer, S_IFREG | REG_FILE_MODE); 40424bbb1faSMichael Holzheu if (IS_ERR(dentry)) { 40524bbb1faSMichael Holzheu kfree(buffer); 40624bbb1faSMichael Holzheu return ERR_PTR(-ENOMEM); 40724bbb1faSMichael Holzheu } 40824bbb1faSMichael Holzheu hypfs_add_dentry(dentry); 40924bbb1faSMichael Holzheu return dentry; 41024bbb1faSMichael Holzheu } 41124bbb1faSMichael Holzheu 412a118cfdfSAl Viro struct dentry *hypfs_create_str(struct dentry *dir, 41324bbb1faSMichael Holzheu const char *name, char *string) 41424bbb1faSMichael Holzheu { 41524bbb1faSMichael Holzheu char *buffer; 41624bbb1faSMichael Holzheu struct dentry *dentry; 41724bbb1faSMichael Holzheu 41824bbb1faSMichael Holzheu buffer = kmalloc(strlen(string) + 2, GFP_KERNEL); 41924bbb1faSMichael Holzheu if (!buffer) 42024bbb1faSMichael Holzheu return ERR_PTR(-ENOMEM); 42124bbb1faSMichael Holzheu sprintf(buffer, "%s\n", string); 42224bbb1faSMichael Holzheu dentry = 423a118cfdfSAl Viro hypfs_create_file(dir, name, buffer, S_IFREG | REG_FILE_MODE); 42424bbb1faSMichael Holzheu if (IS_ERR(dentry)) { 42524bbb1faSMichael Holzheu kfree(buffer); 42624bbb1faSMichael Holzheu return ERR_PTR(-ENOMEM); 42724bbb1faSMichael Holzheu } 42824bbb1faSMichael Holzheu hypfs_add_dentry(dentry); 42924bbb1faSMichael Holzheu return dentry; 43024bbb1faSMichael Holzheu } 43124bbb1faSMichael Holzheu 4325dfe4c96SArjan van de Ven static const struct file_operations hypfs_file_ops = { 43324bbb1faSMichael Holzheu .open = hypfs_open, 43424bbb1faSMichael Holzheu .release = hypfs_release, 435a457ac28SAl Viro .read_iter = hypfs_read_iter, 436a457ac28SAl Viro .write_iter = hypfs_write_iter, 4376038f373SArnd Bergmann .llseek = no_llseek, 43824bbb1faSMichael Holzheu }; 43924bbb1faSMichael Holzheu 44024bbb1faSMichael Holzheu static struct file_system_type hypfs_type = { 44124bbb1faSMichael Holzheu .owner = THIS_MODULE, 44224bbb1faSMichael Holzheu .name = "s390_hypfs", 443fc14f2feSAl Viro .mount = hypfs_mount, 44424bbb1faSMichael Holzheu .kill_sb = hypfs_kill_super 44524bbb1faSMichael Holzheu }; 4467f78e035SEric W. Biederman MODULE_ALIAS_FS("s390_hypfs"); 44724bbb1faSMichael Holzheu 448b87221deSAlexey Dobriyan static const struct super_operations hypfs_s_ops = { 44924bbb1faSMichael Holzheu .statfs = simple_statfs, 450b69257f2SAl Viro .evict_inode = hypfs_evict_inode, 451b01af5baSMichael Holzheu .show_options = hypfs_show_options, 45224bbb1faSMichael Holzheu }; 45324bbb1faSMichael Holzheu 4549b477705SGreg Kroah-Hartman static struct kobject *s390_kobj; 45524bbb1faSMichael Holzheu 45624bbb1faSMichael Holzheu static int __init hypfs_init(void) 45724bbb1faSMichael Holzheu { 45824bbb1faSMichael Holzheu int rc; 45924bbb1faSMichael Holzheu 4602fcb3686SMichael Holzheu rc = hypfs_dbfs_init(); 4612fcb3686SMichael Holzheu if (rc) 4622fcb3686SMichael Holzheu return rc; 46324bbb1faSMichael Holzheu if (hypfs_diag_init()) { 46424bbb1faSMichael Holzheu rc = -ENODATA; 4652fcb3686SMichael Holzheu goto fail_dbfs_exit; 46624bbb1faSMichael Holzheu } 46757b28f66SMichael Holzheu if (hypfs_vm_init()) { 46857b28f66SMichael Holzheu rc = -ENODATA; 46957b28f66SMichael Holzheu goto fail_hypfs_diag_exit; 47031cb4bd3SMichael Holzheu } 47107be0382SMartin Schwidefsky if (hypfs_sprp_init()) { 47207be0382SMartin Schwidefsky rc = -ENODATA; 47307be0382SMartin Schwidefsky goto fail_hypfs_vm_exit; 47407be0382SMartin Schwidefsky } 47534c0dad7SMichael Holzheu if (hypfs_diag0c_init()) { 47634c0dad7SMichael Holzheu rc = -ENODATA; 47734c0dad7SMichael Holzheu goto fail_hypfs_sprp_exit; 47834c0dad7SMichael Holzheu } 4799b477705SGreg Kroah-Hartman s390_kobj = kobject_create_and_add("s390", hypervisor_kobj); 4809b477705SGreg Kroah-Hartman if (!s390_kobj) { 481a419aef8SJoe Perches rc = -ENOMEM; 48234c0dad7SMichael Holzheu goto fail_hypfs_diag0c_exit; 4839b477705SGreg Kroah-Hartman } 48424bbb1faSMichael Holzheu rc = register_filesystem(&hypfs_type); 48524bbb1faSMichael Holzheu if (rc) 48624bbb1faSMichael Holzheu goto fail_filesystem; 48724bbb1faSMichael Holzheu return 0; 48824bbb1faSMichael Holzheu 48924bbb1faSMichael Holzheu fail_filesystem: 49038a382aeSGreg Kroah-Hartman kobject_put(s390_kobj); 49134c0dad7SMichael Holzheu fail_hypfs_diag0c_exit: 49234c0dad7SMichael Holzheu hypfs_diag0c_exit(); 49307be0382SMartin Schwidefsky fail_hypfs_sprp_exit: 49407be0382SMartin Schwidefsky hypfs_sprp_exit(); 49557b28f66SMichael Holzheu fail_hypfs_vm_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 } 50424bbb1faSMichael Holzheu 50524bbb1faSMichael Holzheu static void __exit hypfs_exit(void) 50624bbb1faSMichael Holzheu { 50724bbb1faSMichael Holzheu unregister_filesystem(&hypfs_type); 50838a382aeSGreg Kroah-Hartman kobject_put(s390_kobj); 50934c0dad7SMichael Holzheu hypfs_diag0c_exit(); 51007be0382SMartin Schwidefsky hypfs_sprp_exit(); 51107be0382SMartin Schwidefsky hypfs_vm_exit(); 51207be0382SMartin Schwidefsky hypfs_diag_exit(); 51307be0382SMartin Schwidefsky hypfs_dbfs_exit(); 51424bbb1faSMichael Holzheu } 51524bbb1faSMichael Holzheu 51624bbb1faSMichael Holzheu module_init(hypfs_init) 51724bbb1faSMichael Holzheu module_exit(hypfs_exit) 51824bbb1faSMichael Holzheu 51924bbb1faSMichael Holzheu MODULE_LICENSE("GPL"); 52024bbb1faSMichael Holzheu MODULE_AUTHOR("Michael Holzheu <holzheu@de.ibm.com>"); 52124bbb1faSMichael Holzheu MODULE_DESCRIPTION("s390 Hypervisor Filesystem"); 522