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> 24a27bb332SKent Overstreet #include <linux/aio.h> 2524bbb1faSMichael Holzheu #include <asm/ebcdic.h> 2624bbb1faSMichael Holzheu #include "hypfs.h" 2724bbb1faSMichael Holzheu 2824bbb1faSMichael Holzheu #define HYPFS_MAGIC 0x687970 /* ASCII 'hyp' */ 2924bbb1faSMichael Holzheu #define TMP_SIZE 64 /* size of temporary buffers */ 3024bbb1faSMichael Holzheu 3124bbb1faSMichael Holzheu static struct dentry *hypfs_create_update_file(struct super_block *sb, 3224bbb1faSMichael Holzheu struct dentry *dir); 3324bbb1faSMichael Holzheu 3424bbb1faSMichael Holzheu struct hypfs_sb_info { 356a62a216SEric W. Biederman kuid_t uid; /* uid used for files and dirs */ 366a62a216SEric W. Biederman kgid_t gid; /* gid used for files and dirs */ 3724bbb1faSMichael Holzheu struct dentry *update_file; /* file to trigger update */ 3824bbb1faSMichael Holzheu time_t last_update; /* last update time in secs since 1970 */ 3924bbb1faSMichael Holzheu struct mutex lock; /* lock to protect update process */ 4024bbb1faSMichael Holzheu }; 4124bbb1faSMichael Holzheu 425dfe4c96SArjan van de Ven static const struct file_operations hypfs_file_ops; 4324bbb1faSMichael Holzheu static struct file_system_type hypfs_type; 44b87221deSAlexey Dobriyan static const struct super_operations hypfs_s_ops; 4524bbb1faSMichael Holzheu 4624bbb1faSMichael Holzheu /* start of list of all dentries, which have to be deleted on update */ 4724bbb1faSMichael Holzheu static struct dentry *hypfs_last_dentry; 4824bbb1faSMichael Holzheu 4924bbb1faSMichael Holzheu static void hypfs_update_update(struct super_block *sb) 5024bbb1faSMichael Holzheu { 5124bbb1faSMichael Holzheu struct hypfs_sb_info *sb_info = sb->s_fs_info; 5224bbb1faSMichael Holzheu struct inode *inode = sb_info->update_file->d_inode; 5324bbb1faSMichael Holzheu 5424bbb1faSMichael Holzheu sb_info->last_update = get_seconds(); 5524bbb1faSMichael Holzheu inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 5624bbb1faSMichael Holzheu } 5724bbb1faSMichael Holzheu 5824bbb1faSMichael Holzheu /* directory tree removal functions */ 5924bbb1faSMichael Holzheu 6024bbb1faSMichael Holzheu static void hypfs_add_dentry(struct dentry *dentry) 6124bbb1faSMichael Holzheu { 6224bbb1faSMichael Holzheu dentry->d_fsdata = hypfs_last_dentry; 6324bbb1faSMichael Holzheu hypfs_last_dentry = dentry; 6424bbb1faSMichael Holzheu } 6524bbb1faSMichael Holzheu 669b5a03e1SMichael Holzheu static inline int hypfs_positive(struct dentry *dentry) 679b5a03e1SMichael Holzheu { 689b5a03e1SMichael Holzheu return dentry->d_inode && !d_unhashed(dentry); 699b5a03e1SMichael Holzheu } 709b5a03e1SMichael Holzheu 7124bbb1faSMichael Holzheu static void hypfs_remove(struct dentry *dentry) 7224bbb1faSMichael Holzheu { 7324bbb1faSMichael Holzheu struct dentry *parent; 7424bbb1faSMichael Holzheu 7524bbb1faSMichael Holzheu parent = dentry->d_parent; 769b5a03e1SMichael Holzheu mutex_lock(&parent->d_inode->i_mutex); 779b5a03e1SMichael Holzheu if (hypfs_positive(dentry)) { 7824bbb1faSMichael Holzheu if (S_ISDIR(dentry->d_inode->i_mode)) 7924bbb1faSMichael Holzheu simple_rmdir(parent->d_inode, dentry); 8024bbb1faSMichael Holzheu else 8124bbb1faSMichael Holzheu simple_unlink(parent->d_inode, dentry); 829b5a03e1SMichael Holzheu } 8324bbb1faSMichael Holzheu d_delete(dentry); 8424bbb1faSMichael Holzheu dput(dentry); 859b5a03e1SMichael Holzheu mutex_unlock(&parent->d_inode->i_mutex); 8624bbb1faSMichael Holzheu } 8724bbb1faSMichael Holzheu 8824bbb1faSMichael Holzheu static void hypfs_delete_tree(struct dentry *root) 8924bbb1faSMichael Holzheu { 9024bbb1faSMichael Holzheu while (hypfs_last_dentry) { 9124bbb1faSMichael Holzheu struct dentry *next_dentry; 9224bbb1faSMichael Holzheu next_dentry = hypfs_last_dentry->d_fsdata; 9324bbb1faSMichael Holzheu hypfs_remove(hypfs_last_dentry); 9424bbb1faSMichael Holzheu hypfs_last_dentry = next_dentry; 9524bbb1faSMichael Holzheu } 9624bbb1faSMichael Holzheu } 9724bbb1faSMichael Holzheu 98fec0ebaeSAl Viro static struct inode *hypfs_make_inode(struct super_block *sb, umode_t mode) 9924bbb1faSMichael Holzheu { 10024bbb1faSMichael Holzheu struct inode *ret = new_inode(sb); 10124bbb1faSMichael Holzheu 10224bbb1faSMichael Holzheu if (ret) { 10324bbb1faSMichael Holzheu struct hypfs_sb_info *hypfs_info = sb->s_fs_info; 104c960bec4SMichael Holzheu ret->i_ino = get_next_ino(); 10524bbb1faSMichael Holzheu ret->i_mode = mode; 10624bbb1faSMichael Holzheu ret->i_uid = hypfs_info->uid; 10724bbb1faSMichael Holzheu ret->i_gid = hypfs_info->gid; 10824bbb1faSMichael Holzheu ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME; 109fec0ebaeSAl Viro if (S_ISDIR(mode)) 110bfe86848SMiklos Szeredi set_nlink(ret, 2); 11124bbb1faSMichael Holzheu } 11224bbb1faSMichael Holzheu return ret; 11324bbb1faSMichael Holzheu } 11424bbb1faSMichael Holzheu 115b69257f2SAl Viro static void hypfs_evict_inode(struct inode *inode) 11624bbb1faSMichael Holzheu { 117dbd5768fSJan Kara clear_inode(inode); 1188e18e294STheodore Ts'o kfree(inode->i_private); 11924bbb1faSMichael Holzheu } 12024bbb1faSMichael Holzheu 12124bbb1faSMichael Holzheu static int hypfs_open(struct inode *inode, struct file *filp) 12224bbb1faSMichael Holzheu { 123496ad9aaSAl Viro char *data = file_inode(filp)->i_private; 12424bbb1faSMichael Holzheu struct hypfs_sb_info *fs_info; 12524bbb1faSMichael Holzheu 12624bbb1faSMichael Holzheu if (filp->f_mode & FMODE_WRITE) { 12724bbb1faSMichael Holzheu if (!(inode->i_mode & S_IWUGO)) 12824bbb1faSMichael Holzheu return -EACCES; 12924bbb1faSMichael Holzheu } 13024bbb1faSMichael Holzheu if (filp->f_mode & FMODE_READ) { 13124bbb1faSMichael Holzheu if (!(inode->i_mode & S_IRUGO)) 13224bbb1faSMichael Holzheu return -EACCES; 13324bbb1faSMichael Holzheu } 13424bbb1faSMichael Holzheu 13524bbb1faSMichael Holzheu fs_info = inode->i_sb->s_fs_info; 13624bbb1faSMichael Holzheu if(data) { 13724bbb1faSMichael Holzheu mutex_lock(&fs_info->lock); 13824bbb1faSMichael Holzheu filp->private_data = kstrdup(data, GFP_KERNEL); 13924bbb1faSMichael Holzheu if (!filp->private_data) { 14024bbb1faSMichael Holzheu mutex_unlock(&fs_info->lock); 14124bbb1faSMichael Holzheu return -ENOMEM; 14224bbb1faSMichael Holzheu } 14324bbb1faSMichael Holzheu mutex_unlock(&fs_info->lock); 14424bbb1faSMichael Holzheu } 14558ea91c0SMartin Schwidefsky return nonseekable_open(inode, filp); 14624bbb1faSMichael Holzheu } 14724bbb1faSMichael Holzheu 148027445c3SBadari Pulavarty static ssize_t hypfs_aio_read(struct kiocb *iocb, const struct iovec *iov, 149027445c3SBadari Pulavarty unsigned long nr_segs, loff_t offset) 15024bbb1faSMichael Holzheu { 15124bbb1faSMichael Holzheu char *data; 152a29591c4SAkinobu Mita ssize_t ret; 15324bbb1faSMichael Holzheu struct file *filp = iocb->ki_filp; 154027445c3SBadari Pulavarty /* XXX: temporary */ 155027445c3SBadari Pulavarty char __user *buf = iov[0].iov_base; 156027445c3SBadari Pulavarty size_t count = iov[0].iov_len; 157027445c3SBadari Pulavarty 158a29591c4SAkinobu Mita if (nr_segs != 1) 159a29591c4SAkinobu Mita return -EINVAL; 16024bbb1faSMichael Holzheu 16124bbb1faSMichael Holzheu data = filp->private_data; 162a29591c4SAkinobu Mita ret = simple_read_from_buffer(buf, count, &offset, data, strlen(data)); 163a29591c4SAkinobu Mita if (ret <= 0) 164a29591c4SAkinobu Mita return ret; 165a29591c4SAkinobu Mita 166a29591c4SAkinobu Mita iocb->ki_pos += ret; 16724bbb1faSMichael Holzheu file_accessed(filp); 168a29591c4SAkinobu Mita 169a29591c4SAkinobu Mita return ret; 17024bbb1faSMichael Holzheu } 171027445c3SBadari Pulavarty static ssize_t hypfs_aio_write(struct kiocb *iocb, const struct iovec *iov, 172027445c3SBadari Pulavarty unsigned long nr_segs, loff_t offset) 17324bbb1faSMichael Holzheu { 17424bbb1faSMichael Holzheu int rc; 1756131ffaaSAl Viro struct super_block *sb = file_inode(iocb->ki_filp)->i_sb; 1766131ffaaSAl Viro struct hypfs_sb_info *fs_info = sb->s_fs_info; 177027445c3SBadari Pulavarty size_t count = iov_length(iov, nr_segs); 17824bbb1faSMichael Holzheu 17924bbb1faSMichael Holzheu /* 18024bbb1faSMichael Holzheu * Currently we only allow one update per second for two reasons: 18124bbb1faSMichael Holzheu * 1. diag 204 is VERY expensive 18224bbb1faSMichael Holzheu * 2. If several processes do updates in parallel and then read the 18324bbb1faSMichael Holzheu * hypfs data, the likelihood of collisions is reduced, if we restrict 18424bbb1faSMichael Holzheu * the minimum update interval. A collision occurs, if during the 18524bbb1faSMichael Holzheu * data gathering of one process another process triggers an update 18624bbb1faSMichael Holzheu * If the first process wants to ensure consistent data, it has 18724bbb1faSMichael Holzheu * to restart data collection in this case. 18824bbb1faSMichael Holzheu */ 18924bbb1faSMichael Holzheu mutex_lock(&fs_info->lock); 19024bbb1faSMichael Holzheu if (fs_info->last_update == get_seconds()) { 19124bbb1faSMichael Holzheu rc = -EBUSY; 19224bbb1faSMichael Holzheu goto out; 19324bbb1faSMichael Holzheu } 19424bbb1faSMichael Holzheu hypfs_delete_tree(sb->s_root); 19531cb4bd3SMichael Holzheu if (MACHINE_IS_VM) 196f78e41e3SAl Viro rc = hypfs_vm_create_files(sb->s_root); 19731cb4bd3SMichael Holzheu else 19824bbb1faSMichael Holzheu rc = hypfs_diag_create_files(sb, sb->s_root); 19924bbb1faSMichael Holzheu if (rc) { 200f55495baSMichael Holzheu pr_err("Updating the hypfs tree failed\n"); 20124bbb1faSMichael Holzheu hypfs_delete_tree(sb->s_root); 20224bbb1faSMichael Holzheu goto out; 20324bbb1faSMichael Holzheu } 20424bbb1faSMichael Holzheu hypfs_update_update(sb); 20524bbb1faSMichael Holzheu rc = count; 20624bbb1faSMichael Holzheu out: 20724bbb1faSMichael Holzheu mutex_unlock(&fs_info->lock); 20824bbb1faSMichael Holzheu return rc; 20924bbb1faSMichael Holzheu } 21024bbb1faSMichael Holzheu 21124bbb1faSMichael Holzheu static int hypfs_release(struct inode *inode, struct file *filp) 21224bbb1faSMichael Holzheu { 21324bbb1faSMichael Holzheu kfree(filp->private_data); 21424bbb1faSMichael Holzheu return 0; 21524bbb1faSMichael Holzheu } 21624bbb1faSMichael Holzheu 21724bbb1faSMichael Holzheu enum { opt_uid, opt_gid, opt_err }; 21824bbb1faSMichael Holzheu 219a447c093SSteven Whitehouse static const match_table_t hypfs_tokens = { 22024bbb1faSMichael Holzheu {opt_uid, "uid=%u"}, 22124bbb1faSMichael Holzheu {opt_gid, "gid=%u"}, 22224bbb1faSMichael Holzheu {opt_err, NULL} 22324bbb1faSMichael Holzheu }; 22424bbb1faSMichael Holzheu 22524bbb1faSMichael Holzheu static int hypfs_parse_options(char *options, struct super_block *sb) 22624bbb1faSMichael Holzheu { 22724bbb1faSMichael Holzheu char *str; 22824bbb1faSMichael Holzheu substring_t args[MAX_OPT_ARGS]; 2296a62a216SEric W. Biederman kuid_t uid; 2306a62a216SEric W. Biederman kgid_t gid; 23124bbb1faSMichael Holzheu 23224bbb1faSMichael Holzheu if (!options) 23324bbb1faSMichael Holzheu return 0; 23424bbb1faSMichael Holzheu while ((str = strsep(&options, ",")) != NULL) { 23524bbb1faSMichael Holzheu int token, option; 23624bbb1faSMichael Holzheu struct hypfs_sb_info *hypfs_info = sb->s_fs_info; 23724bbb1faSMichael Holzheu 23824bbb1faSMichael Holzheu if (!*str) 23924bbb1faSMichael Holzheu continue; 24024bbb1faSMichael Holzheu token = match_token(str, hypfs_tokens, args); 24124bbb1faSMichael Holzheu switch (token) { 24224bbb1faSMichael Holzheu case opt_uid: 24324bbb1faSMichael Holzheu if (match_int(&args[0], &option)) 24424bbb1faSMichael Holzheu return -EINVAL; 2456a62a216SEric W. Biederman uid = make_kuid(current_user_ns(), option); 2466a62a216SEric W. Biederman if (!uid_valid(uid)) 2476a62a216SEric W. Biederman return -EINVAL; 2486a62a216SEric W. Biederman hypfs_info->uid = uid; 24924bbb1faSMichael Holzheu break; 25024bbb1faSMichael Holzheu case opt_gid: 25124bbb1faSMichael Holzheu if (match_int(&args[0], &option)) 25224bbb1faSMichael Holzheu return -EINVAL; 2536a62a216SEric W. Biederman gid = make_kgid(current_user_ns(), option); 2546a62a216SEric W. Biederman if (!gid_valid(gid)) 2556a62a216SEric W. Biederman return -EINVAL; 2566a62a216SEric W. Biederman hypfs_info->gid = gid; 25724bbb1faSMichael Holzheu break; 25824bbb1faSMichael Holzheu case opt_err: 25924bbb1faSMichael Holzheu default: 260f55495baSMichael Holzheu pr_err("%s is not a valid mount option\n", str); 26124bbb1faSMichael Holzheu return -EINVAL; 26224bbb1faSMichael Holzheu } 26324bbb1faSMichael Holzheu } 26424bbb1faSMichael Holzheu return 0; 26524bbb1faSMichael Holzheu } 26624bbb1faSMichael Holzheu 26734c80b1dSAl Viro static int hypfs_show_options(struct seq_file *s, struct dentry *root) 268b01af5baSMichael Holzheu { 26934c80b1dSAl Viro struct hypfs_sb_info *hypfs_info = root->d_sb->s_fs_info; 270b01af5baSMichael Holzheu 2716a62a216SEric W. Biederman seq_printf(s, ",uid=%u", from_kuid_munged(&init_user_ns, hypfs_info->uid)); 2726a62a216SEric W. Biederman seq_printf(s, ",gid=%u", from_kgid_munged(&init_user_ns, hypfs_info->gid)); 273b01af5baSMichael Holzheu return 0; 274b01af5baSMichael Holzheu } 275b01af5baSMichael Holzheu 27624bbb1faSMichael Holzheu static int hypfs_fill_super(struct super_block *sb, void *data, int silent) 27724bbb1faSMichael Holzheu { 27824bbb1faSMichael Holzheu struct inode *root_inode; 27924bbb1faSMichael Holzheu struct dentry *root_dentry; 28024bbb1faSMichael Holzheu int rc = 0; 28124bbb1faSMichael Holzheu struct hypfs_sb_info *sbi; 28224bbb1faSMichael Holzheu 28324bbb1faSMichael Holzheu sbi = kzalloc(sizeof(struct hypfs_sb_info), GFP_KERNEL); 28424bbb1faSMichael Holzheu if (!sbi) 28524bbb1faSMichael Holzheu return -ENOMEM; 28624bbb1faSMichael Holzheu mutex_init(&sbi->lock); 287e5423705SDavid Howells sbi->uid = current_uid(); 288e5423705SDavid Howells sbi->gid = current_gid(); 28924bbb1faSMichael Holzheu sb->s_fs_info = sbi; 29024bbb1faSMichael Holzheu sb->s_blocksize = PAGE_CACHE_SIZE; 29124bbb1faSMichael Holzheu sb->s_blocksize_bits = PAGE_CACHE_SHIFT; 29224bbb1faSMichael Holzheu sb->s_magic = HYPFS_MAGIC; 29324bbb1faSMichael Holzheu sb->s_op = &hypfs_s_ops; 294f1771ffaSAl Viro if (hypfs_parse_options(data, sb)) 295f1771ffaSAl Viro return -EINVAL; 29624bbb1faSMichael Holzheu root_inode = hypfs_make_inode(sb, S_IFDIR | 0755); 297f1771ffaSAl Viro if (!root_inode) 298f1771ffaSAl Viro return -ENOMEM; 29924bbb1faSMichael Holzheu root_inode->i_op = &simple_dir_inode_operations; 30024bbb1faSMichael Holzheu root_inode->i_fop = &simple_dir_operations; 30148fde701SAl Viro sb->s_root = root_dentry = d_make_root(root_inode); 30248fde701SAl Viro if (!root_dentry) 303f1771ffaSAl Viro return -ENOMEM; 30431cb4bd3SMichael Holzheu if (MACHINE_IS_VM) 305f78e41e3SAl Viro rc = hypfs_vm_create_files(root_dentry); 30631cb4bd3SMichael Holzheu else 30724bbb1faSMichael Holzheu rc = hypfs_diag_create_files(sb, root_dentry); 30824bbb1faSMichael Holzheu if (rc) 309f1771ffaSAl Viro return rc; 31024bbb1faSMichael Holzheu sbi->update_file = hypfs_create_update_file(sb, root_dentry); 311f1771ffaSAl Viro if (IS_ERR(sbi->update_file)) 312f1771ffaSAl Viro return PTR_ERR(sbi->update_file); 31324bbb1faSMichael Holzheu hypfs_update_update(sb); 314f55495baSMichael Holzheu pr_info("Hypervisor filesystem mounted\n"); 31524bbb1faSMichael Holzheu return 0; 31624bbb1faSMichael Holzheu } 31724bbb1faSMichael Holzheu 318fc14f2feSAl Viro static struct dentry *hypfs_mount(struct file_system_type *fst, int flags, 319fc14f2feSAl Viro const char *devname, void *data) 32024bbb1faSMichael Holzheu { 321fc14f2feSAl Viro return mount_single(fst, flags, data, hypfs_fill_super); 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); 330f1771ffaSAl Viro if (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 33724bbb1faSMichael Holzheu static struct dentry *hypfs_create_file(struct super_block *sb, 33824bbb1faSMichael Holzheu struct dentry *parent, const char *name, 339fec0ebaeSAl Viro char *data, umode_t mode) 34024bbb1faSMichael Holzheu { 34124bbb1faSMichael Holzheu struct dentry *dentry; 34224bbb1faSMichael Holzheu struct inode *inode; 34324bbb1faSMichael Holzheu 3449b5a03e1SMichael Holzheu mutex_lock(&parent->d_inode->i_mutex); 34524bbb1faSMichael Holzheu dentry = lookup_one_len(name, parent, strlen(name)); 3469b5a03e1SMichael Holzheu if (IS_ERR(dentry)) { 3479b5a03e1SMichael Holzheu dentry = ERR_PTR(-ENOMEM); 3489b5a03e1SMichael Holzheu goto fail; 3499b5a03e1SMichael Holzheu } 35024bbb1faSMichael Holzheu inode = hypfs_make_inode(sb, mode); 35124bbb1faSMichael Holzheu if (!inode) { 35224bbb1faSMichael Holzheu dput(dentry); 3539b5a03e1SMichael Holzheu dentry = ERR_PTR(-ENOMEM); 3549b5a03e1SMichael Holzheu goto fail; 35524bbb1faSMichael Holzheu } 356fec0ebaeSAl Viro if (S_ISREG(mode)) { 35724bbb1faSMichael Holzheu inode->i_fop = &hypfs_file_ops; 35824bbb1faSMichael Holzheu if (data) 35924bbb1faSMichael Holzheu inode->i_size = strlen(data); 36024bbb1faSMichael Holzheu else 36124bbb1faSMichael Holzheu inode->i_size = 0; 362fec0ebaeSAl Viro } else if (S_ISDIR(mode)) { 36324bbb1faSMichael Holzheu inode->i_op = &simple_dir_inode_operations; 36424bbb1faSMichael Holzheu inode->i_fop = &simple_dir_operations; 3656d6b77f1SMiklos Szeredi inc_nlink(parent->d_inode); 36624bbb1faSMichael Holzheu } else 36724bbb1faSMichael Holzheu BUG(); 3688e18e294STheodore Ts'o inode->i_private = data; 36924bbb1faSMichael Holzheu d_instantiate(dentry, inode); 37024bbb1faSMichael Holzheu dget(dentry); 3719b5a03e1SMichael Holzheu fail: 3729b5a03e1SMichael Holzheu mutex_unlock(&parent->d_inode->i_mutex); 37324bbb1faSMichael Holzheu return dentry; 37424bbb1faSMichael Holzheu } 37524bbb1faSMichael Holzheu 37624bbb1faSMichael Holzheu struct dentry *hypfs_mkdir(struct super_block *sb, struct dentry *parent, 37724bbb1faSMichael Holzheu const char *name) 37824bbb1faSMichael Holzheu { 37924bbb1faSMichael Holzheu struct dentry *dentry; 38024bbb1faSMichael Holzheu 38124bbb1faSMichael Holzheu dentry = hypfs_create_file(sb, parent, name, NULL, S_IFDIR | DIR_MODE); 38224bbb1faSMichael Holzheu if (IS_ERR(dentry)) 38324bbb1faSMichael Holzheu return dentry; 38424bbb1faSMichael Holzheu hypfs_add_dentry(dentry); 38524bbb1faSMichael Holzheu return dentry; 38624bbb1faSMichael Holzheu } 38724bbb1faSMichael Holzheu 38824bbb1faSMichael Holzheu static struct dentry *hypfs_create_update_file(struct super_block *sb, 38924bbb1faSMichael Holzheu struct dentry *dir) 39024bbb1faSMichael Holzheu { 39124bbb1faSMichael Holzheu struct dentry *dentry; 39224bbb1faSMichael Holzheu 39324bbb1faSMichael Holzheu dentry = hypfs_create_file(sb, dir, "update", NULL, 39424bbb1faSMichael Holzheu S_IFREG | UPDATE_FILE_MODE); 39524bbb1faSMichael Holzheu /* 39624bbb1faSMichael Holzheu * We do not put the update file on the 'delete' list with 39724bbb1faSMichael Holzheu * hypfs_add_dentry(), since it should not be removed when the tree 39824bbb1faSMichael Holzheu * is updated. 39924bbb1faSMichael Holzheu */ 40024bbb1faSMichael Holzheu return dentry; 40124bbb1faSMichael Holzheu } 40224bbb1faSMichael Holzheu 40324bbb1faSMichael Holzheu struct dentry *hypfs_create_u64(struct super_block *sb, struct dentry *dir, 40424bbb1faSMichael Holzheu const char *name, __u64 value) 40524bbb1faSMichael Holzheu { 40624bbb1faSMichael Holzheu char *buffer; 40724bbb1faSMichael Holzheu char tmp[TMP_SIZE]; 40824bbb1faSMichael Holzheu struct dentry *dentry; 40924bbb1faSMichael Holzheu 410ad2a5d8eSMichael Holzheu snprintf(tmp, TMP_SIZE, "%llu\n", (unsigned long long int)value); 41124bbb1faSMichael Holzheu buffer = kstrdup(tmp, GFP_KERNEL); 41224bbb1faSMichael Holzheu if (!buffer) 41324bbb1faSMichael Holzheu return ERR_PTR(-ENOMEM); 41424bbb1faSMichael Holzheu dentry = 41524bbb1faSMichael Holzheu hypfs_create_file(sb, dir, name, buffer, S_IFREG | REG_FILE_MODE); 41624bbb1faSMichael Holzheu if (IS_ERR(dentry)) { 41724bbb1faSMichael Holzheu kfree(buffer); 41824bbb1faSMichael Holzheu return ERR_PTR(-ENOMEM); 41924bbb1faSMichael Holzheu } 42024bbb1faSMichael Holzheu hypfs_add_dentry(dentry); 42124bbb1faSMichael Holzheu return dentry; 42224bbb1faSMichael Holzheu } 42324bbb1faSMichael Holzheu 42424bbb1faSMichael Holzheu struct dentry *hypfs_create_str(struct super_block *sb, struct dentry *dir, 42524bbb1faSMichael Holzheu const char *name, char *string) 42624bbb1faSMichael Holzheu { 42724bbb1faSMichael Holzheu char *buffer; 42824bbb1faSMichael Holzheu struct dentry *dentry; 42924bbb1faSMichael Holzheu 43024bbb1faSMichael Holzheu buffer = kmalloc(strlen(string) + 2, GFP_KERNEL); 43124bbb1faSMichael Holzheu if (!buffer) 43224bbb1faSMichael Holzheu return ERR_PTR(-ENOMEM); 43324bbb1faSMichael Holzheu sprintf(buffer, "%s\n", string); 43424bbb1faSMichael Holzheu dentry = 43524bbb1faSMichael Holzheu hypfs_create_file(sb, dir, name, buffer, S_IFREG | REG_FILE_MODE); 43624bbb1faSMichael Holzheu if (IS_ERR(dentry)) { 43724bbb1faSMichael Holzheu kfree(buffer); 43824bbb1faSMichael Holzheu return ERR_PTR(-ENOMEM); 43924bbb1faSMichael Holzheu } 44024bbb1faSMichael Holzheu hypfs_add_dentry(dentry); 44124bbb1faSMichael Holzheu return dentry; 44224bbb1faSMichael Holzheu } 44324bbb1faSMichael Holzheu 4445dfe4c96SArjan van de Ven static const struct file_operations hypfs_file_ops = { 44524bbb1faSMichael Holzheu .open = hypfs_open, 44624bbb1faSMichael Holzheu .release = hypfs_release, 44724bbb1faSMichael Holzheu .read = do_sync_read, 44824bbb1faSMichael Holzheu .write = do_sync_write, 44924bbb1faSMichael Holzheu .aio_read = hypfs_aio_read, 45024bbb1faSMichael Holzheu .aio_write = hypfs_aio_write, 4516038f373SArnd Bergmann .llseek = no_llseek, 45224bbb1faSMichael Holzheu }; 45324bbb1faSMichael Holzheu 45424bbb1faSMichael Holzheu static struct file_system_type hypfs_type = { 45524bbb1faSMichael Holzheu .owner = THIS_MODULE, 45624bbb1faSMichael Holzheu .name = "s390_hypfs", 457fc14f2feSAl Viro .mount = hypfs_mount, 45824bbb1faSMichael Holzheu .kill_sb = hypfs_kill_super 45924bbb1faSMichael Holzheu }; 4607f78e035SEric W. Biederman MODULE_ALIAS_FS("s390_hypfs"); 46124bbb1faSMichael Holzheu 462b87221deSAlexey Dobriyan static const struct super_operations hypfs_s_ops = { 46324bbb1faSMichael Holzheu .statfs = simple_statfs, 464b69257f2SAl Viro .evict_inode = hypfs_evict_inode, 465b01af5baSMichael Holzheu .show_options = hypfs_show_options, 46624bbb1faSMichael Holzheu }; 46724bbb1faSMichael Holzheu 4689b477705SGreg Kroah-Hartman static struct kobject *s390_kobj; 46924bbb1faSMichael Holzheu 47024bbb1faSMichael Holzheu static int __init hypfs_init(void) 47124bbb1faSMichael Holzheu { 47224bbb1faSMichael Holzheu int rc; 47324bbb1faSMichael Holzheu 4742fcb3686SMichael Holzheu rc = hypfs_dbfs_init(); 4752fcb3686SMichael Holzheu if (rc) 4762fcb3686SMichael Holzheu return rc; 47724bbb1faSMichael Holzheu if (hypfs_diag_init()) { 47824bbb1faSMichael Holzheu rc = -ENODATA; 4792fcb3686SMichael Holzheu goto fail_dbfs_exit; 48024bbb1faSMichael Holzheu } 48157b28f66SMichael Holzheu if (hypfs_vm_init()) { 48257b28f66SMichael Holzheu rc = -ENODATA; 48357b28f66SMichael Holzheu goto fail_hypfs_diag_exit; 48431cb4bd3SMichael Holzheu } 4859b477705SGreg Kroah-Hartman s390_kobj = kobject_create_and_add("s390", hypervisor_kobj); 4869b477705SGreg Kroah-Hartman if (!s390_kobj) { 487a419aef8SJoe Perches rc = -ENOMEM; 48857b28f66SMichael Holzheu goto fail_hypfs_vm_exit; 4899b477705SGreg Kroah-Hartman } 49024bbb1faSMichael Holzheu rc = register_filesystem(&hypfs_type); 49124bbb1faSMichael Holzheu if (rc) 49224bbb1faSMichael Holzheu goto fail_filesystem; 49324bbb1faSMichael Holzheu return 0; 49424bbb1faSMichael Holzheu 49524bbb1faSMichael Holzheu fail_filesystem: 49638a382aeSGreg Kroah-Hartman kobject_put(s390_kobj); 49757b28f66SMichael Holzheu fail_hypfs_vm_exit: 49857b28f66SMichael Holzheu hypfs_vm_exit(); 49957b28f66SMichael Holzheu fail_hypfs_diag_exit: 50024bbb1faSMichael Holzheu hypfs_diag_exit(); 5012fcb3686SMichael Holzheu fail_dbfs_exit: 5022fcb3686SMichael Holzheu hypfs_dbfs_exit(); 503f55495baSMichael Holzheu pr_err("Initialization of hypfs failed with rc=%i\n", rc); 50424bbb1faSMichael Holzheu return rc; 50524bbb1faSMichael Holzheu } 50624bbb1faSMichael Holzheu 50724bbb1faSMichael Holzheu static void __exit hypfs_exit(void) 50824bbb1faSMichael Holzheu { 50924bbb1faSMichael Holzheu hypfs_diag_exit(); 51057b28f66SMichael Holzheu hypfs_vm_exit(); 5112fcb3686SMichael Holzheu hypfs_dbfs_exit(); 51224bbb1faSMichael Holzheu unregister_filesystem(&hypfs_type); 51338a382aeSGreg Kroah-Hartman kobject_put(s390_kobj); 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