1 // SPDX-License-Identifier: GPL-2.0-or-later
6 * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
8 * Author: Arnd Bergmann <arndb@de.ibm.com>
11 #include <linux/file.h>
13 #include <linux/fs_context.h>
14 #include <linux/fs_parser.h>
15 #include <linux/fsnotify.h>
16 #include <linux/backing-dev.h>
17 #include <linux/init.h>
18 #include <linux/ioctl.h>
19 #include <linux/module.h>
20 #include <linux/mount.h>
21 #include <linux/namei.h>
22 #include <linux/pagemap.h>
23 #include <linux/poll.h>
25 #include <linux/seq_file.h>
26 #include <linux/slab.h>
29 #include <asm/spu_priv1.h>
30 #include <linux/uaccess.h>
34 struct spufs_sb_info {
38 static struct kmem_cache *spufs_inode_cache;
39 char *isolated_loader;
40 static int isolated_loader_size;
42 static struct spufs_sb_info *spufs_get_sb_info(struct super_block *sb)
48 spufs_alloc_inode(struct super_block *sb)
50 struct spufs_inode_info *ei;
52 ei = kmem_cache_alloc(spufs_inode_cache, GFP_KERNEL);
60 return &ei->vfs_inode;
63 static void spufs_free_inode(struct inode *inode)
65 kmem_cache_free(spufs_inode_cache, SPUFS_I(inode));
69 spufs_init_once(void *p)
71 struct spufs_inode_info *ei = p;
73 inode_init_once(&ei->vfs_inode);
77 spufs_new_inode(struct super_block *sb, umode_t mode)
81 inode = new_inode(sb);
85 inode->i_ino = get_next_ino();
87 inode->i_uid = current_fsuid();
88 inode->i_gid = current_fsgid();
89 simple_inode_init_ts(inode);
95 spufs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
98 struct inode *inode = d_inode(dentry);
100 if ((attr->ia_valid & ATTR_SIZE) &&
101 (attr->ia_size != inode->i_size))
103 setattr_copy(&nop_mnt_idmap, inode, attr);
104 mark_inode_dirty(inode);
110 spufs_new_file(struct super_block *sb, struct dentry *dentry,
111 const struct file_operations *fops, umode_t mode,
112 size_t size, struct spu_context *ctx)
114 static const struct inode_operations spufs_file_iops = {
115 .setattr = spufs_setattr,
121 inode = spufs_new_inode(sb, S_IFREG | mode);
126 inode->i_op = &spufs_file_iops;
128 inode->i_size = size;
129 inode->i_private = SPUFS_I(inode)->i_ctx = get_spu_context(ctx);
130 d_add(dentry, inode);
136 spufs_evict_inode(struct inode *inode)
138 struct spufs_inode_info *ei = SPUFS_I(inode);
141 put_spu_context(ei->i_ctx);
143 put_spu_gang(ei->i_gang);
146 static void spufs_prune_dir(struct dentry *dir)
148 struct dentry *dentry;
149 struct hlist_node *n;
151 inode_lock(d_inode(dir));
152 hlist_for_each_entry_safe(dentry, n, &dir->d_children, d_sib) {
153 spin_lock(&dentry->d_lock);
154 if (simple_positive(dentry)) {
157 spin_unlock(&dentry->d_lock);
158 simple_unlink(d_inode(dir), dentry);
159 /* XXX: what was dcache_lock protecting here? Other
160 * filesystems (IB, configfs) release dcache_lock
164 spin_unlock(&dentry->d_lock);
167 shrink_dcache_parent(dir);
168 inode_unlock(d_inode(dir));
171 /* Caller must hold parent->i_mutex */
172 static int spufs_rmdir(struct inode *parent, struct dentry *dir)
174 /* remove all entries */
176 spufs_prune_dir(dir);
178 res = simple_rmdir(parent, dir);
179 /* We have to give up the mm_struct */
180 spu_forget(SPUFS_I(d_inode(dir))->i_ctx);
184 static int spufs_fill_dir(struct dentry *dir,
185 const struct spufs_tree_descr *files, umode_t mode,
186 struct spu_context *ctx)
188 while (files->name && files->name[0]) {
190 struct dentry *dentry = d_alloc_name(dir, files->name);
193 ret = spufs_new_file(dir->d_sb, dentry, files->ops,
194 files->mode & mode, files->size, ctx);
202 static int spufs_dir_close(struct inode *inode, struct file *file)
204 struct inode *parent;
208 dir = file->f_path.dentry;
209 parent = d_inode(dir->d_parent);
211 inode_lock_nested(parent, I_MUTEX_PARENT);
212 ret = spufs_rmdir(parent, dir);
213 inode_unlock(parent);
216 return dcache_dir_close(inode, file);
219 const struct file_operations spufs_context_fops = {
220 .open = dcache_dir_open,
221 .release = spufs_dir_close,
222 .llseek = dcache_dir_lseek,
223 .read = generic_read_dir,
224 .iterate_shared = dcache_readdir,
227 EXPORT_SYMBOL_GPL(spufs_context_fops);
230 spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
235 struct spu_context *ctx;
237 inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
241 inode_init_owner(&nop_mnt_idmap, inode, dir, mode | S_IFDIR);
242 ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */
243 SPUFS_I(inode)->i_ctx = ctx;
250 inode->i_op = &simple_dir_inode_operations;
251 inode->i_fop = &simple_dir_operations;
259 d_instantiate(dentry, inode);
261 if (flags & SPU_CREATE_NOSCHED)
262 ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
265 ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
267 if (!ret && spufs_get_sb_info(dir->i_sb)->debug)
268 ret = spufs_fill_dir(dentry, spufs_dir_debug_contents,
272 spufs_rmdir(dir, dentry);
279 static int spufs_context_open(const struct path *path)
284 ret = get_unused_fd_flags(0);
288 filp = dentry_open(path, O_RDONLY, current_cred());
291 return PTR_ERR(filp);
294 filp->f_op = &spufs_context_fops;
295 fd_install(ret, filp);
299 static struct spu_context *
300 spufs_assert_affinity(unsigned int flags, struct spu_gang *gang,
303 struct spu_context *tmp, *neighbor, *err;
307 aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next,
308 struct spu, cbe_list))->aff_list);
311 return ERR_PTR(-EINVAL);
313 if (flags & SPU_CREATE_GANG)
314 return ERR_PTR(-EINVAL);
316 if (flags & SPU_CREATE_AFFINITY_MEM &&
318 gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM)
319 return ERR_PTR(-EEXIST);
321 if (gang->aff_flags & AFF_MERGED)
322 return ERR_PTR(-EBUSY);
325 if (flags & SPU_CREATE_AFFINITY_SPU) {
326 if (!filp || filp->f_op != &spufs_context_fops)
327 return ERR_PTR(-EINVAL);
329 neighbor = get_spu_context(
330 SPUFS_I(file_inode(filp))->i_ctx);
332 if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) &&
333 !list_is_last(&neighbor->aff_list, &gang->aff_list_head) &&
334 !list_entry(neighbor->aff_list.next, struct spu_context,
335 aff_list)->aff_head) {
336 err = ERR_PTR(-EEXIST);
337 goto out_put_neighbor;
340 if (gang != neighbor->gang) {
341 err = ERR_PTR(-EINVAL);
342 goto out_put_neighbor;
346 list_for_each_entry(tmp, &gang->aff_list_head, aff_list)
348 if (list_empty(&neighbor->aff_list))
351 for (node = 0; node < MAX_NUMNODES; node++) {
352 if ((cbe_spu_info[node].n_spus - atomic_read(
353 &cbe_spu_info[node].reserved_spus)) >= count)
357 if (node == MAX_NUMNODES) {
358 err = ERR_PTR(-EEXIST);
359 goto out_put_neighbor;
366 put_spu_context(neighbor);
371 spufs_set_affinity(unsigned int flags, struct spu_context *ctx,
372 struct spu_context *neighbor)
374 if (flags & SPU_CREATE_AFFINITY_MEM)
375 ctx->gang->aff_ref_ctx = ctx;
377 if (flags & SPU_CREATE_AFFINITY_SPU) {
378 if (list_empty(&neighbor->aff_list)) {
379 list_add_tail(&neighbor->aff_list,
380 &ctx->gang->aff_list_head);
381 neighbor->aff_head = 1;
384 if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head)
385 || list_entry(neighbor->aff_list.next, struct spu_context,
386 aff_list)->aff_head) {
387 list_add(&ctx->aff_list, &neighbor->aff_list);
389 list_add_tail(&ctx->aff_list, &neighbor->aff_list);
390 if (neighbor->aff_head) {
391 neighbor->aff_head = 0;
396 if (!ctx->gang->aff_ref_ctx)
397 ctx->gang->aff_ref_ctx = ctx;
402 spufs_create_context(struct inode *inode, struct dentry *dentry,
403 struct vfsmount *mnt, int flags, umode_t mode,
404 struct file *aff_filp)
408 struct spu_gang *gang;
409 struct spu_context *neighbor;
410 struct path path = {.mnt = mnt, .dentry = dentry};
412 if ((flags & SPU_CREATE_NOSCHED) &&
413 !capable(CAP_SYS_NICE))
416 if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
417 == SPU_CREATE_ISOLATE)
420 if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader)
425 affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU);
427 gang = SPUFS_I(inode)->i_gang;
430 mutex_lock(&gang->aff_mutex);
431 neighbor = spufs_assert_affinity(flags, gang, aff_filp);
432 if (IS_ERR(neighbor)) {
433 ret = PTR_ERR(neighbor);
438 ret = spufs_mkdir(inode, dentry, flags, mode & 0777);
443 spufs_set_affinity(flags, SPUFS_I(d_inode(dentry))->i_ctx,
446 put_spu_context(neighbor);
449 ret = spufs_context_open(&path);
451 WARN_ON(spufs_rmdir(inode, dentry));
455 mutex_unlock(&gang->aff_mutex);
460 spufs_mkgang(struct inode *dir, struct dentry *dentry, umode_t mode)
464 struct spu_gang *gang;
467 inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
472 inode_init_owner(&nop_mnt_idmap, inode, dir, mode | S_IFDIR);
473 gang = alloc_spu_gang();
474 SPUFS_I(inode)->i_ctx = NULL;
475 SPUFS_I(inode)->i_gang = gang;
481 inode->i_op = &simple_dir_inode_operations;
482 inode->i_fop = &simple_dir_operations;
484 d_instantiate(dentry, inode);
486 inc_nlink(d_inode(dentry));
495 static int spufs_gang_open(const struct path *path)
500 ret = get_unused_fd_flags(0);
505 * get references for dget and mntget, will be released
506 * in error path of *_open().
508 filp = dentry_open(path, O_RDONLY, current_cred());
511 return PTR_ERR(filp);
514 filp->f_op = &simple_dir_operations;
515 fd_install(ret, filp);
519 static int spufs_create_gang(struct inode *inode,
520 struct dentry *dentry,
521 struct vfsmount *mnt, umode_t mode)
523 struct path path = {.mnt = mnt, .dentry = dentry};
526 ret = spufs_mkgang(inode, dentry, mode & 0777);
528 ret = spufs_gang_open(&path);
530 int err = simple_rmdir(inode, dentry);
538 static struct file_system_type spufs_type;
540 long spufs_create(const struct path *path, struct dentry *dentry,
541 unsigned int flags, umode_t mode, struct file *filp)
543 struct inode *dir = d_inode(path->dentry);
546 /* check if we are on spufs */
547 if (path->dentry->d_sb->s_type != &spufs_type)
550 /* don't accept undefined flags */
551 if (flags & (~SPU_CREATE_FLAG_ALL))
554 /* only threads can be underneath a gang */
555 if (path->dentry != path->dentry->d_sb->s_root)
556 if ((flags & SPU_CREATE_GANG) || !SPUFS_I(dir)->i_gang)
559 mode &= ~current_umask();
561 if (flags & SPU_CREATE_GANG)
562 ret = spufs_create_gang(dir, dentry, path->mnt, mode);
564 ret = spufs_create_context(dir, dentry, path->mnt, flags, mode,
567 fsnotify_mkdir(dir, dentry);
572 /* File system initialization */
573 struct spufs_fs_context {
580 Opt_uid, Opt_gid, Opt_mode, Opt_debug,
583 static const struct fs_parameter_spec spufs_fs_parameters[] = {
584 fsparam_u32 ("gid", Opt_gid),
585 fsparam_u32oct ("mode", Opt_mode),
586 fsparam_u32 ("uid", Opt_uid),
587 fsparam_flag ("debug", Opt_debug),
591 static int spufs_show_options(struct seq_file *m, struct dentry *root)
593 struct spufs_sb_info *sbi = spufs_get_sb_info(root->d_sb);
594 struct inode *inode = root->d_inode;
596 if (!uid_eq(inode->i_uid, GLOBAL_ROOT_UID))
597 seq_printf(m, ",uid=%u",
598 from_kuid_munged(&init_user_ns, inode->i_uid));
599 if (!gid_eq(inode->i_gid, GLOBAL_ROOT_GID))
600 seq_printf(m, ",gid=%u",
601 from_kgid_munged(&init_user_ns, inode->i_gid));
602 if ((inode->i_mode & S_IALLUGO) != 0775)
603 seq_printf(m, ",mode=%o", inode->i_mode);
605 seq_puts(m, ",debug");
609 static int spufs_parse_param(struct fs_context *fc, struct fs_parameter *param)
611 struct spufs_fs_context *ctx = fc->fs_private;
612 struct spufs_sb_info *sbi = fc->s_fs_info;
613 struct fs_parse_result result;
618 opt = fs_parse(fc, spufs_fs_parameters, param, &result);
624 uid = make_kuid(current_user_ns(), result.uint_32);
626 return invalf(fc, "Unknown uid");
630 gid = make_kgid(current_user_ns(), result.uint_32);
632 return invalf(fc, "Unknown gid");
636 ctx->mode = result.uint_32 & S_IALLUGO;
646 static void spufs_exit_isolated_loader(void)
648 free_pages((unsigned long) isolated_loader,
649 get_order(isolated_loader_size));
653 spufs_init_isolated_loader(void)
655 struct device_node *dn;
659 dn = of_find_node_by_path("/spu-isolation");
663 loader = of_get_property(dn, "loader", &size);
668 /* the loader must be align on a 16 byte boundary */
669 isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size));
670 if (!isolated_loader)
673 isolated_loader_size = size;
674 memcpy(isolated_loader, loader, size);
675 printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
678 static int spufs_create_root(struct super_block *sb, struct fs_context *fc)
680 struct spufs_fs_context *ctx = fc->fs_private;
683 if (!spu_management_ops)
686 inode = spufs_new_inode(sb, S_IFDIR | ctx->mode);
690 inode->i_uid = ctx->uid;
691 inode->i_gid = ctx->gid;
692 inode->i_op = &simple_dir_inode_operations;
693 inode->i_fop = &simple_dir_operations;
694 SPUFS_I(inode)->i_ctx = NULL;
697 sb->s_root = d_make_root(inode);
703 static const struct super_operations spufs_ops = {
704 .alloc_inode = spufs_alloc_inode,
705 .free_inode = spufs_free_inode,
706 .statfs = simple_statfs,
707 .evict_inode = spufs_evict_inode,
708 .show_options = spufs_show_options,
711 static int spufs_fill_super(struct super_block *sb, struct fs_context *fc)
713 sb->s_maxbytes = MAX_LFS_FILESIZE;
714 sb->s_blocksize = PAGE_SIZE;
715 sb->s_blocksize_bits = PAGE_SHIFT;
716 sb->s_magic = SPUFS_MAGIC;
717 sb->s_op = &spufs_ops;
719 return spufs_create_root(sb, fc);
722 static int spufs_get_tree(struct fs_context *fc)
724 return get_tree_single(fc, spufs_fill_super);
727 static void spufs_free_fc(struct fs_context *fc)
729 kfree(fc->s_fs_info);
732 static const struct fs_context_operations spufs_context_ops = {
733 .free = spufs_free_fc,
734 .parse_param = spufs_parse_param,
735 .get_tree = spufs_get_tree,
738 static int spufs_init_fs_context(struct fs_context *fc)
740 struct spufs_fs_context *ctx;
741 struct spufs_sb_info *sbi;
743 ctx = kzalloc(sizeof(struct spufs_fs_context), GFP_KERNEL);
747 sbi = kzalloc(sizeof(struct spufs_sb_info), GFP_KERNEL);
751 ctx->uid = current_uid();
752 ctx->gid = current_gid();
755 fc->fs_private = ctx;
757 fc->ops = &spufs_context_ops;
766 static struct file_system_type spufs_type = {
767 .owner = THIS_MODULE,
769 .init_fs_context = spufs_init_fs_context,
770 .parameters = spufs_fs_parameters,
771 .kill_sb = kill_litter_super,
773 MODULE_ALIAS_FS("spufs");
775 static int __init spufs_init(void)
780 if (!spu_management_ops)
784 spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
785 sizeof(struct spufs_inode_info), 0,
786 SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, spufs_init_once);
788 if (!spufs_inode_cache)
790 ret = spu_sched_init();
793 ret = register_spu_syscalls(&spufs_calls);
796 ret = register_filesystem(&spufs_type);
800 spufs_init_isolated_loader();
805 unregister_spu_syscalls(&spufs_calls);
809 kmem_cache_destroy(spufs_inode_cache);
813 module_init(spufs_init);
815 static void __exit spufs_exit(void)
818 spufs_exit_isolated_loader();
819 unregister_spu_syscalls(&spufs_calls);
820 unregister_filesystem(&spufs_type);
821 kmem_cache_destroy(spufs_inode_cache);
823 module_exit(spufs_exit);
825 MODULE_LICENSE("GPL");
826 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");