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> 2424bbb1faSMichael Holzheu #include <asm/ebcdic.h> 2524bbb1faSMichael Holzheu #include "hypfs.h" 2624bbb1faSMichael Holzheu 2724bbb1faSMichael Holzheu #define HYPFS_MAGIC 0x687970 /* ASCII 'hyp' */ 2824bbb1faSMichael Holzheu #define TMP_SIZE 64 /* size of temporary buffers */ 2924bbb1faSMichael Holzheu 3024bbb1faSMichael Holzheu static struct dentry *hypfs_create_update_file(struct super_block *sb, 3124bbb1faSMichael Holzheu 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; 5124bbb1faSMichael Holzheu struct inode *inode = sb_info->update_file->d_inode; 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 659b5a03e1SMichael Holzheu static inline int hypfs_positive(struct dentry *dentry) 669b5a03e1SMichael Holzheu { 679b5a03e1SMichael Holzheu return dentry->d_inode && !d_unhashed(dentry); 689b5a03e1SMichael Holzheu } 699b5a03e1SMichael Holzheu 7024bbb1faSMichael Holzheu static void hypfs_remove(struct dentry *dentry) 7124bbb1faSMichael Holzheu { 7224bbb1faSMichael Holzheu struct dentry *parent; 7324bbb1faSMichael Holzheu 7424bbb1faSMichael Holzheu parent = dentry->d_parent; 759b5a03e1SMichael Holzheu if (!parent || !parent->d_inode) 769b5a03e1SMichael Holzheu return; 779b5a03e1SMichael Holzheu mutex_lock(&parent->d_inode->i_mutex); 789b5a03e1SMichael Holzheu if (hypfs_positive(dentry)) { 7924bbb1faSMichael Holzheu if (S_ISDIR(dentry->d_inode->i_mode)) 8024bbb1faSMichael Holzheu simple_rmdir(parent->d_inode, dentry); 8124bbb1faSMichael Holzheu else 8224bbb1faSMichael Holzheu simple_unlink(parent->d_inode, dentry); 839b5a03e1SMichael Holzheu } 8424bbb1faSMichael Holzheu d_delete(dentry); 8524bbb1faSMichael Holzheu dput(dentry); 869b5a03e1SMichael Holzheu mutex_unlock(&parent->d_inode->i_mutex); 8724bbb1faSMichael Holzheu } 8824bbb1faSMichael Holzheu 8924bbb1faSMichael Holzheu static void hypfs_delete_tree(struct dentry *root) 9024bbb1faSMichael Holzheu { 9124bbb1faSMichael Holzheu while (hypfs_last_dentry) { 9224bbb1faSMichael Holzheu struct dentry *next_dentry; 9324bbb1faSMichael Holzheu next_dentry = hypfs_last_dentry->d_fsdata; 9424bbb1faSMichael Holzheu hypfs_remove(hypfs_last_dentry); 9524bbb1faSMichael Holzheu hypfs_last_dentry = next_dentry; 9624bbb1faSMichael Holzheu } 9724bbb1faSMichael Holzheu } 9824bbb1faSMichael Holzheu 99fec0ebaeSAl Viro static struct inode *hypfs_make_inode(struct super_block *sb, umode_t mode) 10024bbb1faSMichael Holzheu { 10124bbb1faSMichael Holzheu struct inode *ret = new_inode(sb); 10224bbb1faSMichael Holzheu 10324bbb1faSMichael Holzheu if (ret) { 10424bbb1faSMichael Holzheu struct hypfs_sb_info *hypfs_info = sb->s_fs_info; 105c960bec4SMichael Holzheu ret->i_ino = get_next_ino(); 10624bbb1faSMichael Holzheu ret->i_mode = mode; 10724bbb1faSMichael Holzheu ret->i_uid = hypfs_info->uid; 10824bbb1faSMichael Holzheu ret->i_gid = hypfs_info->gid; 10924bbb1faSMichael Holzheu ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME; 110fec0ebaeSAl Viro if (S_ISDIR(mode)) 111bfe86848SMiklos Szeredi set_nlink(ret, 2); 11224bbb1faSMichael Holzheu } 11324bbb1faSMichael Holzheu return ret; 11424bbb1faSMichael Holzheu } 11524bbb1faSMichael Holzheu 116b69257f2SAl Viro static void hypfs_evict_inode(struct inode *inode) 11724bbb1faSMichael Holzheu { 118dbd5768fSJan Kara clear_inode(inode); 1198e18e294STheodore Ts'o kfree(inode->i_private); 12024bbb1faSMichael Holzheu } 12124bbb1faSMichael Holzheu 12224bbb1faSMichael Holzheu static int hypfs_open(struct inode *inode, struct file *filp) 12324bbb1faSMichael Holzheu { 124d20343e7SJosef Sipek char *data = filp->f_path.dentry->d_inode->i_private; 12524bbb1faSMichael Holzheu struct hypfs_sb_info *fs_info; 12624bbb1faSMichael Holzheu 12724bbb1faSMichael Holzheu if (filp->f_mode & FMODE_WRITE) { 12824bbb1faSMichael Holzheu if (!(inode->i_mode & S_IWUGO)) 12924bbb1faSMichael Holzheu return -EACCES; 13024bbb1faSMichael Holzheu } 13124bbb1faSMichael Holzheu if (filp->f_mode & FMODE_READ) { 13224bbb1faSMichael Holzheu if (!(inode->i_mode & S_IRUGO)) 13324bbb1faSMichael Holzheu return -EACCES; 13424bbb1faSMichael Holzheu } 13524bbb1faSMichael Holzheu 13624bbb1faSMichael Holzheu fs_info = inode->i_sb->s_fs_info; 13724bbb1faSMichael Holzheu if(data) { 13824bbb1faSMichael Holzheu mutex_lock(&fs_info->lock); 13924bbb1faSMichael Holzheu filp->private_data = kstrdup(data, GFP_KERNEL); 14024bbb1faSMichael Holzheu if (!filp->private_data) { 14124bbb1faSMichael Holzheu mutex_unlock(&fs_info->lock); 14224bbb1faSMichael Holzheu return -ENOMEM; 14324bbb1faSMichael Holzheu } 14424bbb1faSMichael Holzheu mutex_unlock(&fs_info->lock); 14524bbb1faSMichael Holzheu } 14658ea91c0SMartin Schwidefsky return nonseekable_open(inode, filp); 14724bbb1faSMichael Holzheu } 14824bbb1faSMichael Holzheu 149027445c3SBadari Pulavarty static ssize_t hypfs_aio_read(struct kiocb *iocb, const struct iovec *iov, 150027445c3SBadari Pulavarty unsigned long nr_segs, loff_t offset) 15124bbb1faSMichael Holzheu { 15224bbb1faSMichael Holzheu char *data; 153a29591c4SAkinobu Mita ssize_t ret; 15424bbb1faSMichael Holzheu struct file *filp = iocb->ki_filp; 155027445c3SBadari Pulavarty /* XXX: temporary */ 156027445c3SBadari Pulavarty char __user *buf = iov[0].iov_base; 157027445c3SBadari Pulavarty size_t count = iov[0].iov_len; 158027445c3SBadari Pulavarty 159a29591c4SAkinobu Mita if (nr_segs != 1) 160a29591c4SAkinobu Mita return -EINVAL; 16124bbb1faSMichael Holzheu 16224bbb1faSMichael Holzheu data = filp->private_data; 163a29591c4SAkinobu Mita ret = simple_read_from_buffer(buf, count, &offset, data, strlen(data)); 164a29591c4SAkinobu Mita if (ret <= 0) 165a29591c4SAkinobu Mita return ret; 166a29591c4SAkinobu Mita 167a29591c4SAkinobu Mita iocb->ki_pos += ret; 16824bbb1faSMichael Holzheu file_accessed(filp); 169a29591c4SAkinobu Mita 170a29591c4SAkinobu Mita return ret; 17124bbb1faSMichael Holzheu } 172027445c3SBadari Pulavarty static ssize_t hypfs_aio_write(struct kiocb *iocb, const struct iovec *iov, 173027445c3SBadari Pulavarty unsigned long nr_segs, loff_t offset) 17424bbb1faSMichael Holzheu { 17524bbb1faSMichael Holzheu int rc; 17624bbb1faSMichael Holzheu struct super_block *sb; 17724bbb1faSMichael Holzheu struct hypfs_sb_info *fs_info; 178027445c3SBadari Pulavarty size_t count = iov_length(iov, nr_segs); 17924bbb1faSMichael Holzheu 180d20343e7SJosef Sipek sb = iocb->ki_filp->f_path.dentry->d_inode->i_sb; 18124bbb1faSMichael Holzheu fs_info = sb->s_fs_info; 18224bbb1faSMichael Holzheu /* 18324bbb1faSMichael Holzheu * Currently we only allow one update per second for two reasons: 18424bbb1faSMichael Holzheu * 1. diag 204 is VERY expensive 18524bbb1faSMichael Holzheu * 2. If several processes do updates in parallel and then read the 18624bbb1faSMichael Holzheu * hypfs data, the likelihood of collisions is reduced, if we restrict 18724bbb1faSMichael Holzheu * the minimum update interval. A collision occurs, if during the 18824bbb1faSMichael Holzheu * data gathering of one process another process triggers an update 18924bbb1faSMichael Holzheu * If the first process wants to ensure consistent data, it has 19024bbb1faSMichael Holzheu * to restart data collection in this case. 19124bbb1faSMichael Holzheu */ 19224bbb1faSMichael Holzheu mutex_lock(&fs_info->lock); 19324bbb1faSMichael Holzheu if (fs_info->last_update == get_seconds()) { 19424bbb1faSMichael Holzheu rc = -EBUSY; 19524bbb1faSMichael Holzheu goto out; 19624bbb1faSMichael Holzheu } 19724bbb1faSMichael Holzheu hypfs_delete_tree(sb->s_root); 19831cb4bd3SMichael Holzheu if (MACHINE_IS_VM) 19931cb4bd3SMichael Holzheu rc = hypfs_vm_create_files(sb, sb->s_root); 20031cb4bd3SMichael Holzheu else 20124bbb1faSMichael Holzheu rc = hypfs_diag_create_files(sb, sb->s_root); 20224bbb1faSMichael Holzheu if (rc) { 203f55495baSMichael Holzheu pr_err("Updating the hypfs tree failed\n"); 20424bbb1faSMichael Holzheu hypfs_delete_tree(sb->s_root); 20524bbb1faSMichael Holzheu goto out; 20624bbb1faSMichael Holzheu } 20724bbb1faSMichael Holzheu hypfs_update_update(sb); 20824bbb1faSMichael Holzheu rc = count; 20924bbb1faSMichael Holzheu out: 21024bbb1faSMichael Holzheu mutex_unlock(&fs_info->lock); 21124bbb1faSMichael Holzheu return rc; 21224bbb1faSMichael Holzheu } 21324bbb1faSMichael Holzheu 21424bbb1faSMichael Holzheu static int hypfs_release(struct inode *inode, struct file *filp) 21524bbb1faSMichael Holzheu { 21624bbb1faSMichael Holzheu kfree(filp->private_data); 21724bbb1faSMichael Holzheu return 0; 21824bbb1faSMichael Holzheu } 21924bbb1faSMichael Holzheu 22024bbb1faSMichael Holzheu enum { opt_uid, opt_gid, opt_err }; 22124bbb1faSMichael Holzheu 222a447c093SSteven Whitehouse static const match_table_t hypfs_tokens = { 22324bbb1faSMichael Holzheu {opt_uid, "uid=%u"}, 22424bbb1faSMichael Holzheu {opt_gid, "gid=%u"}, 22524bbb1faSMichael Holzheu {opt_err, NULL} 22624bbb1faSMichael Holzheu }; 22724bbb1faSMichael Holzheu 22824bbb1faSMichael Holzheu static int hypfs_parse_options(char *options, struct super_block *sb) 22924bbb1faSMichael Holzheu { 23024bbb1faSMichael Holzheu char *str; 23124bbb1faSMichael Holzheu substring_t args[MAX_OPT_ARGS]; 2326a62a216SEric W. Biederman kuid_t uid; 2336a62a216SEric W. Biederman kgid_t gid; 23424bbb1faSMichael Holzheu 23524bbb1faSMichael Holzheu if (!options) 23624bbb1faSMichael Holzheu return 0; 23724bbb1faSMichael Holzheu while ((str = strsep(&options, ",")) != NULL) { 23824bbb1faSMichael Holzheu int token, option; 23924bbb1faSMichael Holzheu struct hypfs_sb_info *hypfs_info = sb->s_fs_info; 24024bbb1faSMichael Holzheu 24124bbb1faSMichael Holzheu if (!*str) 24224bbb1faSMichael Holzheu continue; 24324bbb1faSMichael Holzheu token = match_token(str, hypfs_tokens, args); 24424bbb1faSMichael Holzheu switch (token) { 24524bbb1faSMichael Holzheu case opt_uid: 24624bbb1faSMichael Holzheu if (match_int(&args[0], &option)) 24724bbb1faSMichael Holzheu return -EINVAL; 2486a62a216SEric W. Biederman uid = make_kuid(current_user_ns(), option); 2496a62a216SEric W. Biederman if (!uid_valid(uid)) 2506a62a216SEric W. Biederman return -EINVAL; 2516a62a216SEric W. Biederman hypfs_info->uid = uid; 25224bbb1faSMichael Holzheu break; 25324bbb1faSMichael Holzheu case opt_gid: 25424bbb1faSMichael Holzheu if (match_int(&args[0], &option)) 25524bbb1faSMichael Holzheu return -EINVAL; 2566a62a216SEric W. Biederman gid = make_kgid(current_user_ns(), option); 2576a62a216SEric W. Biederman if (!gid_valid(gid)) 2586a62a216SEric W. Biederman return -EINVAL; 2596a62a216SEric W. Biederman hypfs_info->gid = gid; 26024bbb1faSMichael Holzheu break; 26124bbb1faSMichael Holzheu case opt_err: 26224bbb1faSMichael Holzheu default: 263f55495baSMichael Holzheu pr_err("%s is not a valid mount option\n", str); 26424bbb1faSMichael Holzheu return -EINVAL; 26524bbb1faSMichael Holzheu } 26624bbb1faSMichael Holzheu } 26724bbb1faSMichael Holzheu return 0; 26824bbb1faSMichael Holzheu } 26924bbb1faSMichael Holzheu 27034c80b1dSAl Viro static int hypfs_show_options(struct seq_file *s, struct dentry *root) 271b01af5baSMichael Holzheu { 27234c80b1dSAl Viro struct hypfs_sb_info *hypfs_info = root->d_sb->s_fs_info; 273b01af5baSMichael Holzheu 2746a62a216SEric W. Biederman seq_printf(s, ",uid=%u", from_kuid_munged(&init_user_ns, hypfs_info->uid)); 2756a62a216SEric W. Biederman seq_printf(s, ",gid=%u", from_kgid_munged(&init_user_ns, hypfs_info->gid)); 276b01af5baSMichael Holzheu return 0; 277b01af5baSMichael Holzheu } 278b01af5baSMichael Holzheu 27924bbb1faSMichael Holzheu static int hypfs_fill_super(struct super_block *sb, void *data, int silent) 28024bbb1faSMichael Holzheu { 28124bbb1faSMichael Holzheu struct inode *root_inode; 28224bbb1faSMichael Holzheu struct dentry *root_dentry; 28324bbb1faSMichael Holzheu int rc = 0; 28424bbb1faSMichael Holzheu struct hypfs_sb_info *sbi; 28524bbb1faSMichael Holzheu 28624bbb1faSMichael Holzheu sbi = kzalloc(sizeof(struct hypfs_sb_info), GFP_KERNEL); 28724bbb1faSMichael Holzheu if (!sbi) 28824bbb1faSMichael Holzheu return -ENOMEM; 28924bbb1faSMichael Holzheu mutex_init(&sbi->lock); 290e5423705SDavid Howells sbi->uid = current_uid(); 291e5423705SDavid Howells sbi->gid = current_gid(); 29224bbb1faSMichael Holzheu sb->s_fs_info = sbi; 29324bbb1faSMichael Holzheu sb->s_blocksize = PAGE_CACHE_SIZE; 29424bbb1faSMichael Holzheu sb->s_blocksize_bits = PAGE_CACHE_SHIFT; 29524bbb1faSMichael Holzheu sb->s_magic = HYPFS_MAGIC; 29624bbb1faSMichael Holzheu sb->s_op = &hypfs_s_ops; 297f1771ffaSAl Viro if (hypfs_parse_options(data, sb)) 298f1771ffaSAl Viro return -EINVAL; 29924bbb1faSMichael Holzheu root_inode = hypfs_make_inode(sb, S_IFDIR | 0755); 300f1771ffaSAl Viro if (!root_inode) 301f1771ffaSAl Viro return -ENOMEM; 30224bbb1faSMichael Holzheu root_inode->i_op = &simple_dir_inode_operations; 30324bbb1faSMichael Holzheu root_inode->i_fop = &simple_dir_operations; 30448fde701SAl Viro sb->s_root = root_dentry = d_make_root(root_inode); 30548fde701SAl Viro if (!root_dentry) 306f1771ffaSAl Viro return -ENOMEM; 30731cb4bd3SMichael Holzheu if (MACHINE_IS_VM) 30831cb4bd3SMichael Holzheu rc = hypfs_vm_create_files(sb, root_dentry); 30931cb4bd3SMichael Holzheu else 31024bbb1faSMichael Holzheu rc = hypfs_diag_create_files(sb, root_dentry); 31124bbb1faSMichael Holzheu if (rc) 312f1771ffaSAl Viro return rc; 31324bbb1faSMichael Holzheu sbi->update_file = hypfs_create_update_file(sb, root_dentry); 314f1771ffaSAl Viro if (IS_ERR(sbi->update_file)) 315f1771ffaSAl Viro return PTR_ERR(sbi->update_file); 31624bbb1faSMichael Holzheu hypfs_update_update(sb); 317f55495baSMichael Holzheu pr_info("Hypervisor filesystem mounted\n"); 31824bbb1faSMichael Holzheu return 0; 31924bbb1faSMichael Holzheu } 32024bbb1faSMichael Holzheu 321fc14f2feSAl Viro static struct dentry *hypfs_mount(struct file_system_type *fst, int flags, 322fc14f2feSAl Viro const char *devname, void *data) 32324bbb1faSMichael Holzheu { 324fc14f2feSAl Viro return mount_single(fst, flags, data, hypfs_fill_super); 32524bbb1faSMichael Holzheu } 32624bbb1faSMichael Holzheu 32724bbb1faSMichael Holzheu static void hypfs_kill_super(struct super_block *sb) 32824bbb1faSMichael Holzheu { 32924bbb1faSMichael Holzheu struct hypfs_sb_info *sb_info = sb->s_fs_info; 33024bbb1faSMichael Holzheu 331f1771ffaSAl Viro if (sb->s_root) 33224bbb1faSMichael Holzheu hypfs_delete_tree(sb->s_root); 333f1771ffaSAl Viro if (sb_info->update_file) 33424bbb1faSMichael Holzheu hypfs_remove(sb_info->update_file); 33524bbb1faSMichael Holzheu kfree(sb->s_fs_info); 33624bbb1faSMichael Holzheu sb->s_fs_info = NULL; 33724bbb1faSMichael Holzheu kill_litter_super(sb); 33824bbb1faSMichael Holzheu } 33924bbb1faSMichael Holzheu 34024bbb1faSMichael Holzheu static struct dentry *hypfs_create_file(struct super_block *sb, 34124bbb1faSMichael Holzheu struct dentry *parent, const char *name, 342fec0ebaeSAl Viro char *data, umode_t mode) 34324bbb1faSMichael Holzheu { 34424bbb1faSMichael Holzheu struct dentry *dentry; 34524bbb1faSMichael Holzheu struct inode *inode; 34624bbb1faSMichael Holzheu 3479b5a03e1SMichael Holzheu mutex_lock(&parent->d_inode->i_mutex); 34824bbb1faSMichael Holzheu dentry = lookup_one_len(name, parent, strlen(name)); 3499b5a03e1SMichael Holzheu if (IS_ERR(dentry)) { 3509b5a03e1SMichael Holzheu dentry = ERR_PTR(-ENOMEM); 3519b5a03e1SMichael Holzheu goto fail; 3529b5a03e1SMichael Holzheu } 35324bbb1faSMichael Holzheu inode = hypfs_make_inode(sb, mode); 35424bbb1faSMichael Holzheu if (!inode) { 35524bbb1faSMichael Holzheu dput(dentry); 3569b5a03e1SMichael Holzheu dentry = ERR_PTR(-ENOMEM); 3579b5a03e1SMichael Holzheu goto fail; 35824bbb1faSMichael Holzheu } 359fec0ebaeSAl Viro if (S_ISREG(mode)) { 36024bbb1faSMichael Holzheu inode->i_fop = &hypfs_file_ops; 36124bbb1faSMichael Holzheu if (data) 36224bbb1faSMichael Holzheu inode->i_size = strlen(data); 36324bbb1faSMichael Holzheu else 36424bbb1faSMichael Holzheu inode->i_size = 0; 365fec0ebaeSAl Viro } else if (S_ISDIR(mode)) { 36624bbb1faSMichael Holzheu inode->i_op = &simple_dir_inode_operations; 36724bbb1faSMichael Holzheu inode->i_fop = &simple_dir_operations; 3686d6b77f1SMiklos Szeredi inc_nlink(parent->d_inode); 36924bbb1faSMichael Holzheu } else 37024bbb1faSMichael Holzheu BUG(); 3718e18e294STheodore Ts'o inode->i_private = data; 37224bbb1faSMichael Holzheu d_instantiate(dentry, inode); 37324bbb1faSMichael Holzheu dget(dentry); 3749b5a03e1SMichael Holzheu fail: 3759b5a03e1SMichael Holzheu mutex_unlock(&parent->d_inode->i_mutex); 37624bbb1faSMichael Holzheu return dentry; 37724bbb1faSMichael Holzheu } 37824bbb1faSMichael Holzheu 37924bbb1faSMichael Holzheu struct dentry *hypfs_mkdir(struct super_block *sb, struct dentry *parent, 38024bbb1faSMichael Holzheu const char *name) 38124bbb1faSMichael Holzheu { 38224bbb1faSMichael Holzheu struct dentry *dentry; 38324bbb1faSMichael Holzheu 38424bbb1faSMichael Holzheu dentry = hypfs_create_file(sb, parent, name, NULL, S_IFDIR | DIR_MODE); 38524bbb1faSMichael Holzheu if (IS_ERR(dentry)) 38624bbb1faSMichael Holzheu return dentry; 38724bbb1faSMichael Holzheu hypfs_add_dentry(dentry); 38824bbb1faSMichael Holzheu return dentry; 38924bbb1faSMichael Holzheu } 39024bbb1faSMichael Holzheu 39124bbb1faSMichael Holzheu static struct dentry *hypfs_create_update_file(struct super_block *sb, 39224bbb1faSMichael Holzheu struct dentry *dir) 39324bbb1faSMichael Holzheu { 39424bbb1faSMichael Holzheu struct dentry *dentry; 39524bbb1faSMichael Holzheu 39624bbb1faSMichael Holzheu dentry = hypfs_create_file(sb, dir, "update", NULL, 39724bbb1faSMichael Holzheu S_IFREG | UPDATE_FILE_MODE); 39824bbb1faSMichael Holzheu /* 39924bbb1faSMichael Holzheu * We do not put the update file on the 'delete' list with 40024bbb1faSMichael Holzheu * hypfs_add_dentry(), since it should not be removed when the tree 40124bbb1faSMichael Holzheu * is updated. 40224bbb1faSMichael Holzheu */ 40324bbb1faSMichael Holzheu return dentry; 40424bbb1faSMichael Holzheu } 40524bbb1faSMichael Holzheu 40624bbb1faSMichael Holzheu struct dentry *hypfs_create_u64(struct super_block *sb, struct dentry *dir, 40724bbb1faSMichael Holzheu const char *name, __u64 value) 40824bbb1faSMichael Holzheu { 40924bbb1faSMichael Holzheu char *buffer; 41024bbb1faSMichael Holzheu char tmp[TMP_SIZE]; 41124bbb1faSMichael Holzheu struct dentry *dentry; 41224bbb1faSMichael Holzheu 413ad2a5d8eSMichael Holzheu snprintf(tmp, TMP_SIZE, "%llu\n", (unsigned long long int)value); 41424bbb1faSMichael Holzheu buffer = kstrdup(tmp, GFP_KERNEL); 41524bbb1faSMichael Holzheu if (!buffer) 41624bbb1faSMichael Holzheu return ERR_PTR(-ENOMEM); 41724bbb1faSMichael Holzheu dentry = 41824bbb1faSMichael Holzheu hypfs_create_file(sb, dir, name, buffer, S_IFREG | REG_FILE_MODE); 41924bbb1faSMichael Holzheu if (IS_ERR(dentry)) { 42024bbb1faSMichael Holzheu kfree(buffer); 42124bbb1faSMichael Holzheu return ERR_PTR(-ENOMEM); 42224bbb1faSMichael Holzheu } 42324bbb1faSMichael Holzheu hypfs_add_dentry(dentry); 42424bbb1faSMichael Holzheu return dentry; 42524bbb1faSMichael Holzheu } 42624bbb1faSMichael Holzheu 42724bbb1faSMichael Holzheu struct dentry *hypfs_create_str(struct super_block *sb, struct dentry *dir, 42824bbb1faSMichael Holzheu const char *name, char *string) 42924bbb1faSMichael Holzheu { 43024bbb1faSMichael Holzheu char *buffer; 43124bbb1faSMichael Holzheu struct dentry *dentry; 43224bbb1faSMichael Holzheu 43324bbb1faSMichael Holzheu buffer = kmalloc(strlen(string) + 2, GFP_KERNEL); 43424bbb1faSMichael Holzheu if (!buffer) 43524bbb1faSMichael Holzheu return ERR_PTR(-ENOMEM); 43624bbb1faSMichael Holzheu sprintf(buffer, "%s\n", string); 43724bbb1faSMichael Holzheu dentry = 43824bbb1faSMichael Holzheu hypfs_create_file(sb, dir, name, buffer, S_IFREG | REG_FILE_MODE); 43924bbb1faSMichael Holzheu if (IS_ERR(dentry)) { 44024bbb1faSMichael Holzheu kfree(buffer); 44124bbb1faSMichael Holzheu return ERR_PTR(-ENOMEM); 44224bbb1faSMichael Holzheu } 44324bbb1faSMichael Holzheu hypfs_add_dentry(dentry); 44424bbb1faSMichael Holzheu return dentry; 44524bbb1faSMichael Holzheu } 44624bbb1faSMichael Holzheu 4475dfe4c96SArjan van de Ven static const struct file_operations hypfs_file_ops = { 44824bbb1faSMichael Holzheu .open = hypfs_open, 44924bbb1faSMichael Holzheu .release = hypfs_release, 45024bbb1faSMichael Holzheu .read = do_sync_read, 45124bbb1faSMichael Holzheu .write = do_sync_write, 45224bbb1faSMichael Holzheu .aio_read = hypfs_aio_read, 45324bbb1faSMichael Holzheu .aio_write = hypfs_aio_write, 4546038f373SArnd Bergmann .llseek = no_llseek, 45524bbb1faSMichael Holzheu }; 45624bbb1faSMichael Holzheu 45724bbb1faSMichael Holzheu static struct file_system_type hypfs_type = { 45824bbb1faSMichael Holzheu .owner = THIS_MODULE, 45924bbb1faSMichael Holzheu .name = "s390_hypfs", 460fc14f2feSAl Viro .mount = hypfs_mount, 46124bbb1faSMichael Holzheu .kill_sb = hypfs_kill_super 46224bbb1faSMichael Holzheu }; 46324bbb1faSMichael Holzheu 464b87221deSAlexey Dobriyan static const struct super_operations hypfs_s_ops = { 46524bbb1faSMichael Holzheu .statfs = simple_statfs, 466b69257f2SAl Viro .evict_inode = hypfs_evict_inode, 467b01af5baSMichael Holzheu .show_options = hypfs_show_options, 46824bbb1faSMichael Holzheu }; 46924bbb1faSMichael Holzheu 4709b477705SGreg Kroah-Hartman static struct kobject *s390_kobj; 47124bbb1faSMichael Holzheu 47224bbb1faSMichael Holzheu static int __init hypfs_init(void) 47324bbb1faSMichael Holzheu { 47424bbb1faSMichael Holzheu int rc; 47524bbb1faSMichael Holzheu 4762fcb3686SMichael Holzheu rc = hypfs_dbfs_init(); 4772fcb3686SMichael Holzheu if (rc) 4782fcb3686SMichael Holzheu return rc; 47924bbb1faSMichael Holzheu if (hypfs_diag_init()) { 48024bbb1faSMichael Holzheu rc = -ENODATA; 4812fcb3686SMichael Holzheu goto fail_dbfs_exit; 48224bbb1faSMichael Holzheu } 48357b28f66SMichael Holzheu if (hypfs_vm_init()) { 48457b28f66SMichael Holzheu rc = -ENODATA; 48557b28f66SMichael Holzheu goto fail_hypfs_diag_exit; 48631cb4bd3SMichael Holzheu } 4879b477705SGreg Kroah-Hartman s390_kobj = kobject_create_and_add("s390", hypervisor_kobj); 4889b477705SGreg Kroah-Hartman if (!s390_kobj) { 489a419aef8SJoe Perches rc = -ENOMEM; 49057b28f66SMichael Holzheu goto fail_hypfs_vm_exit; 4919b477705SGreg Kroah-Hartman } 49224bbb1faSMichael Holzheu rc = register_filesystem(&hypfs_type); 49324bbb1faSMichael Holzheu if (rc) 49424bbb1faSMichael Holzheu goto fail_filesystem; 49524bbb1faSMichael Holzheu return 0; 49624bbb1faSMichael Holzheu 49724bbb1faSMichael Holzheu fail_filesystem: 49838a382aeSGreg Kroah-Hartman kobject_put(s390_kobj); 49957b28f66SMichael Holzheu fail_hypfs_vm_exit: 50057b28f66SMichael Holzheu hypfs_vm_exit(); 50157b28f66SMichael Holzheu fail_hypfs_diag_exit: 50224bbb1faSMichael Holzheu hypfs_diag_exit(); 5032fcb3686SMichael Holzheu fail_dbfs_exit: 5042fcb3686SMichael Holzheu hypfs_dbfs_exit(); 505f55495baSMichael Holzheu pr_err("Initialization of hypfs failed with rc=%i\n", rc); 50624bbb1faSMichael Holzheu return rc; 50724bbb1faSMichael Holzheu } 50824bbb1faSMichael Holzheu 50924bbb1faSMichael Holzheu static void __exit hypfs_exit(void) 51024bbb1faSMichael Holzheu { 51124bbb1faSMichael Holzheu hypfs_diag_exit(); 51257b28f66SMichael Holzheu hypfs_vm_exit(); 5132fcb3686SMichael Holzheu hypfs_dbfs_exit(); 51424bbb1faSMichael Holzheu unregister_filesystem(&hypfs_type); 51538a382aeSGreg Kroah-Hartman kobject_put(s390_kobj); 51624bbb1faSMichael Holzheu } 51724bbb1faSMichael Holzheu 51824bbb1faSMichael Holzheu module_init(hypfs_init) 51924bbb1faSMichael Holzheu module_exit(hypfs_exit) 52024bbb1faSMichael Holzheu 52124bbb1faSMichael Holzheu MODULE_LICENSE("GPL"); 52224bbb1faSMichael Holzheu MODULE_AUTHOR("Michael Holzheu <holzheu@de.ibm.com>"); 52324bbb1faSMichael Holzheu MODULE_DESCRIPTION("s390 Hypervisor Filesystem"); 524