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v6.9.4
  1/*
  2 *  linux/fs/hfs/super.c
  3 *
  4 * Copyright (C) 1995-1997  Paul H. Hargrove
  5 * (C) 2003 Ardis Technologies <roman@ardistech.com>
  6 * This file may be distributed under the terms of the GNU General Public License.
  7 *
  8 * This file contains hfs_read_super(), some of the super_ops and
  9 * init_hfs_fs() and exit_hfs_fs().  The remaining super_ops are in
 10 * inode.c since they deal with inodes.
 11 *
 12 * Based on the minix file system code, (C) 1991, 1992 by Linus Torvalds
 13 */
 14
 15#include <linux/module.h>
 16#include <linux/blkdev.h>
 17#include <linux/backing-dev.h>
 
 
 18#include <linux/mount.h>
 19#include <linux/init.h>
 20#include <linux/nls.h>
 21#include <linux/parser.h>
 22#include <linux/seq_file.h>
 23#include <linux/slab.h>
 24#include <linux/vfs.h>
 25
 26#include "hfs_fs.h"
 27#include "btree.h"
 28
 29static struct kmem_cache *hfs_inode_cachep;
 30
 
 31MODULE_LICENSE("GPL");
 32
 33static int hfs_sync_fs(struct super_block *sb, int wait)
 34{
 35	hfs_mdb_commit(sb);
 36	return 0;
 37}
 38
 39/*
 40 * hfs_put_super()
 41 *
 42 * This is the put_super() entry in the super_operations structure for
 43 * HFS filesystems.  The purpose is to release the resources
 44 * associated with the superblock sb.
 45 */
 46static void hfs_put_super(struct super_block *sb)
 47{
 48	cancel_delayed_work_sync(&HFS_SB(sb)->mdb_work);
 49	hfs_mdb_close(sb);
 50	/* release the MDB's resources */
 51	hfs_mdb_put(sb);
 52}
 53
 54static void flush_mdb(struct work_struct *work)
 55{
 56	struct hfs_sb_info *sbi;
 57	struct super_block *sb;
 58
 59	sbi = container_of(work, struct hfs_sb_info, mdb_work.work);
 60	sb = sbi->sb;
 61
 62	spin_lock(&sbi->work_lock);
 63	sbi->work_queued = 0;
 64	spin_unlock(&sbi->work_lock);
 65
 66	hfs_mdb_commit(sb);
 67}
 68
 69void hfs_mark_mdb_dirty(struct super_block *sb)
 70{
 71	struct hfs_sb_info *sbi = HFS_SB(sb);
 72	unsigned long delay;
 73
 74	if (sb_rdonly(sb))
 75		return;
 76
 77	spin_lock(&sbi->work_lock);
 78	if (!sbi->work_queued) {
 79		delay = msecs_to_jiffies(dirty_writeback_interval * 10);
 80		queue_delayed_work(system_long_wq, &sbi->mdb_work, delay);
 81		sbi->work_queued = 1;
 82	}
 83	spin_unlock(&sbi->work_lock);
 84}
 85
 86/*
 87 * hfs_statfs()
 88 *
 89 * This is the statfs() entry in the super_operations structure for
 90 * HFS filesystems.  The purpose is to return various data about the
 91 * filesystem.
 92 *
 93 * changed f_files/f_ffree to reflect the fs_ablock/free_ablocks.
 94 */
 95static int hfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 96{
 97	struct super_block *sb = dentry->d_sb;
 98	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 99
100	buf->f_type = HFS_SUPER_MAGIC;
101	buf->f_bsize = sb->s_blocksize;
102	buf->f_blocks = (u32)HFS_SB(sb)->fs_ablocks * HFS_SB(sb)->fs_div;
103	buf->f_bfree = (u32)HFS_SB(sb)->free_ablocks * HFS_SB(sb)->fs_div;
104	buf->f_bavail = buf->f_bfree;
105	buf->f_files = HFS_SB(sb)->fs_ablocks;
106	buf->f_ffree = HFS_SB(sb)->free_ablocks;
107	buf->f_fsid = u64_to_fsid(id);
108	buf->f_namelen = HFS_NAMELEN;
109
110	return 0;
111}
112
113static int hfs_remount(struct super_block *sb, int *flags, char *data)
114{
 
 
115	sync_filesystem(sb);
116	*flags |= SB_NODIRATIME;
117	if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
118		return 0;
119	if (!(*flags & SB_RDONLY)) {
 
120		if (!(HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_UNMNT))) {
121			pr_warn("filesystem was not cleanly unmounted, running fsck.hfs is recommended.  leaving read-only.\n");
122			sb->s_flags |= SB_RDONLY;
123			*flags |= SB_RDONLY;
124		} else if (HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_SLOCK)) {
125			pr_warn("filesystem is marked locked, leaving read-only.\n");
126			sb->s_flags |= SB_RDONLY;
127			*flags |= SB_RDONLY;
128		}
129	}
130	return 0;
131}
132
133static int hfs_show_options(struct seq_file *seq, struct dentry *root)
134{
135	struct hfs_sb_info *sbi = HFS_SB(root->d_sb);
136
137	if (sbi->s_creator != cpu_to_be32(0x3f3f3f3f))
138		seq_show_option_n(seq, "creator", (char *)&sbi->s_creator, 4);
139	if (sbi->s_type != cpu_to_be32(0x3f3f3f3f))
140		seq_show_option_n(seq, "type", (char *)&sbi->s_type, 4);
141	seq_printf(seq, ",uid=%u,gid=%u",
142			from_kuid_munged(&init_user_ns, sbi->s_uid),
143			from_kgid_munged(&init_user_ns, sbi->s_gid));
144	if (sbi->s_file_umask != 0133)
145		seq_printf(seq, ",file_umask=%o", sbi->s_file_umask);
146	if (sbi->s_dir_umask != 0022)
147		seq_printf(seq, ",dir_umask=%o", sbi->s_dir_umask);
148	if (sbi->part >= 0)
149		seq_printf(seq, ",part=%u", sbi->part);
150	if (sbi->session >= 0)
151		seq_printf(seq, ",session=%u", sbi->session);
152	if (sbi->nls_disk)
153		seq_printf(seq, ",codepage=%s", sbi->nls_disk->charset);
154	if (sbi->nls_io)
155		seq_printf(seq, ",iocharset=%s", sbi->nls_io->charset);
156	if (sbi->s_quiet)
157		seq_printf(seq, ",quiet");
158	return 0;
159}
160
161static struct inode *hfs_alloc_inode(struct super_block *sb)
162{
163	struct hfs_inode_info *i;
164
165	i = alloc_inode_sb(sb, hfs_inode_cachep, GFP_KERNEL);
166	return i ? &i->vfs_inode : NULL;
167}
168
169static void hfs_free_inode(struct inode *inode)
170{
171	kmem_cache_free(hfs_inode_cachep, HFS_I(inode));
172}
173
174static const struct super_operations hfs_super_operations = {
175	.alloc_inode	= hfs_alloc_inode,
176	.free_inode	= hfs_free_inode,
177	.write_inode	= hfs_write_inode,
178	.evict_inode	= hfs_evict_inode,
179	.put_super	= hfs_put_super,
180	.sync_fs	= hfs_sync_fs,
181	.statfs		= hfs_statfs,
182	.remount_fs     = hfs_remount,
183	.show_options	= hfs_show_options,
184};
185
186enum {
187	opt_uid, opt_gid, opt_umask, opt_file_umask, opt_dir_umask,
188	opt_part, opt_session, opt_type, opt_creator, opt_quiet,
189	opt_codepage, opt_iocharset,
190	opt_err
191};
192
193static const match_table_t tokens = {
194	{ opt_uid, "uid=%u" },
195	{ opt_gid, "gid=%u" },
196	{ opt_umask, "umask=%o" },
197	{ opt_file_umask, "file_umask=%o" },
198	{ opt_dir_umask, "dir_umask=%o" },
199	{ opt_part, "part=%u" },
200	{ opt_session, "session=%u" },
201	{ opt_type, "type=%s" },
202	{ opt_creator, "creator=%s" },
203	{ opt_quiet, "quiet" },
204	{ opt_codepage, "codepage=%s" },
205	{ opt_iocharset, "iocharset=%s" },
206	{ opt_err, NULL }
207};
208
209static inline int match_fourchar(substring_t *arg, u32 *result)
210{
211	if (arg->to - arg->from != 4)
212		return -EINVAL;
213	memcpy(result, arg->from, 4);
214	return 0;
215}
216
217/*
218 * parse_options()
219 *
220 * adapted from linux/fs/msdos/inode.c written 1992,93 by Werner Almesberger
221 * This function is called by hfs_read_super() to parse the mount options.
222 */
223static int parse_options(char *options, struct hfs_sb_info *hsb)
224{
225	char *p;
226	substring_t args[MAX_OPT_ARGS];
227	int tmp, token;
228
229	/* initialize the sb with defaults */
230	hsb->s_uid = current_uid();
231	hsb->s_gid = current_gid();
232	hsb->s_file_umask = 0133;
233	hsb->s_dir_umask = 0022;
234	hsb->s_type = hsb->s_creator = cpu_to_be32(0x3f3f3f3f);	/* == '????' */
235	hsb->s_quiet = 0;
236	hsb->part = -1;
237	hsb->session = -1;
238
239	if (!options)
240		return 1;
241
242	while ((p = strsep(&options, ",")) != NULL) {
243		if (!*p)
244			continue;
245
246		token = match_token(p, tokens, args);
247		switch (token) {
248		case opt_uid:
249			if (match_int(&args[0], &tmp)) {
250				pr_err("uid requires an argument\n");
251				return 0;
252			}
253			hsb->s_uid = make_kuid(current_user_ns(), (uid_t)tmp);
254			if (!uid_valid(hsb->s_uid)) {
255				pr_err("invalid uid %d\n", tmp);
256				return 0;
257			}
258			break;
259		case opt_gid:
260			if (match_int(&args[0], &tmp)) {
261				pr_err("gid requires an argument\n");
262				return 0;
263			}
264			hsb->s_gid = make_kgid(current_user_ns(), (gid_t)tmp);
265			if (!gid_valid(hsb->s_gid)) {
266				pr_err("invalid gid %d\n", tmp);
267				return 0;
268			}
269			break;
270		case opt_umask:
271			if (match_octal(&args[0], &tmp)) {
272				pr_err("umask requires a value\n");
273				return 0;
274			}
275			hsb->s_file_umask = (umode_t)tmp;
276			hsb->s_dir_umask = (umode_t)tmp;
277			break;
278		case opt_file_umask:
279			if (match_octal(&args[0], &tmp)) {
280				pr_err("file_umask requires a value\n");
281				return 0;
282			}
283			hsb->s_file_umask = (umode_t)tmp;
284			break;
285		case opt_dir_umask:
286			if (match_octal(&args[0], &tmp)) {
287				pr_err("dir_umask requires a value\n");
288				return 0;
289			}
290			hsb->s_dir_umask = (umode_t)tmp;
291			break;
292		case opt_part:
293			if (match_int(&args[0], &hsb->part)) {
294				pr_err("part requires an argument\n");
295				return 0;
296			}
297			break;
298		case opt_session:
299			if (match_int(&args[0], &hsb->session)) {
300				pr_err("session requires an argument\n");
301				return 0;
302			}
303			break;
304		case opt_type:
305			if (match_fourchar(&args[0], &hsb->s_type)) {
306				pr_err("type requires a 4 character value\n");
307				return 0;
308			}
309			break;
310		case opt_creator:
311			if (match_fourchar(&args[0], &hsb->s_creator)) {
312				pr_err("creator requires a 4 character value\n");
313				return 0;
314			}
315			break;
316		case opt_quiet:
317			hsb->s_quiet = 1;
318			break;
319		case opt_codepage:
320			if (hsb->nls_disk) {
321				pr_err("unable to change codepage\n");
322				return 0;
323			}
324			p = match_strdup(&args[0]);
325			if (p)
326				hsb->nls_disk = load_nls(p);
327			if (!hsb->nls_disk) {
328				pr_err("unable to load codepage \"%s\"\n", p);
329				kfree(p);
330				return 0;
331			}
332			kfree(p);
333			break;
334		case opt_iocharset:
335			if (hsb->nls_io) {
336				pr_err("unable to change iocharset\n");
337				return 0;
338			}
339			p = match_strdup(&args[0]);
340			if (p)
341				hsb->nls_io = load_nls(p);
342			if (!hsb->nls_io) {
343				pr_err("unable to load iocharset \"%s\"\n", p);
344				kfree(p);
345				return 0;
346			}
347			kfree(p);
348			break;
349		default:
350			return 0;
351		}
352	}
353
354	if (hsb->nls_disk && !hsb->nls_io) {
355		hsb->nls_io = load_nls_default();
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
356		if (!hsb->nls_io) {
357			pr_err("unable to load default iocharset\n");
358			return 0;
 
359		}
 
 
 
360	}
361	hsb->s_dir_umask &= 0777;
362	hsb->s_file_umask &= 0577;
363
364	return 1;
365}
366
367/*
368 * hfs_read_super()
369 *
370 * This is the function that is responsible for mounting an HFS
371 * filesystem.	It performs all the tasks necessary to get enough data
372 * from the disk to read the root inode.  This includes parsing the
373 * mount options, dealing with Macintosh partitions, reading the
374 * superblock and the allocation bitmap blocks, calling
375 * hfs_btree_init() to get the necessary data about the extents and
376 * catalog B-trees and, finally, reading the root inode into memory.
377 */
378static int hfs_fill_super(struct super_block *sb, void *data, int silent)
379{
380	struct hfs_sb_info *sbi;
381	struct hfs_find_data fd;
382	hfs_cat_rec rec;
383	struct inode *root_inode;
 
384	int res;
385
386	sbi = kzalloc(sizeof(struct hfs_sb_info), GFP_KERNEL);
387	if (!sbi)
388		return -ENOMEM;
 
 
389
390	sbi->sb = sb;
391	sb->s_fs_info = sbi;
392	spin_lock_init(&sbi->work_lock);
393	INIT_DELAYED_WORK(&sbi->mdb_work, flush_mdb);
394
395	res = -EINVAL;
396	if (!parse_options((char *)data, sbi)) {
397		pr_err("unable to parse mount options\n");
398		goto bail;
399	}
400
401	sb->s_op = &hfs_super_operations;
402	sb->s_xattr = hfs_xattr_handlers;
403	sb->s_flags |= SB_NODIRATIME;
404	mutex_init(&sbi->bitmap_lock);
405
406	res = hfs_mdb_get(sb);
407	if (res) {
408		if (!silent)
409			pr_warn("can't find a HFS filesystem on dev %s\n",
410				hfs_mdb_name(sb));
411		res = -EINVAL;
412		goto bail;
413	}
414
415	/* try to get the root inode */
416	res = hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
417	if (res)
418		goto bail_no_root;
419	res = hfs_cat_find_brec(sb, HFS_ROOT_CNID, &fd);
420	if (!res) {
421		if (fd.entrylength > sizeof(rec) || fd.entrylength < 0) {
422			res =  -EIO;
423			goto bail_hfs_find;
424		}
425		hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, fd.entrylength);
 
 
426	}
427	if (res)
428		goto bail_hfs_find;
429	res = -EINVAL;
430	root_inode = hfs_iget(sb, &fd.search_key->cat, &rec);
431	hfs_find_exit(&fd);
432	if (!root_inode)
433		goto bail_no_root;
434
435	sb->s_d_op = &hfs_dentry_operations;
436	res = -ENOMEM;
437	sb->s_root = d_make_root(root_inode);
438	if (!sb->s_root)
439		goto bail_no_root;
440
441	/* everything's okay */
442	return 0;
443
444bail_hfs_find:
445	hfs_find_exit(&fd);
446bail_no_root:
447	pr_err("get root inode failed\n");
448bail:
449	hfs_mdb_put(sb);
450	return res;
451}
452
453static struct dentry *hfs_mount(struct file_system_type *fs_type,
454		      int flags, const char *dev_name, void *data)
455{
456	return mount_bdev(fs_type, flags, dev_name, data, hfs_fill_super);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
457}
458
459static struct file_system_type hfs_fs_type = {
460	.owner		= THIS_MODULE,
461	.name		= "hfs",
462	.mount		= hfs_mount,
463	.kill_sb	= kill_block_super,
464	.fs_flags	= FS_REQUIRES_DEV,
 
465};
466MODULE_ALIAS_FS("hfs");
467
468static void hfs_init_once(void *p)
469{
470	struct hfs_inode_info *i = p;
471
472	inode_init_once(&i->vfs_inode);
473}
474
475static int __init init_hfs_fs(void)
476{
477	int err;
478
479	hfs_inode_cachep = kmem_cache_create("hfs_inode_cache",
480		sizeof(struct hfs_inode_info), 0,
481		SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, hfs_init_once);
482	if (!hfs_inode_cachep)
483		return -ENOMEM;
484	err = register_filesystem(&hfs_fs_type);
485	if (err)
486		kmem_cache_destroy(hfs_inode_cachep);
487	return err;
488}
489
490static void __exit exit_hfs_fs(void)
491{
492	unregister_filesystem(&hfs_fs_type);
493
494	/*
495	 * Make sure all delayed rcu free inodes are flushed before we
496	 * destroy cache.
497	 */
498	rcu_barrier();
499	kmem_cache_destroy(hfs_inode_cachep);
500}
501
502module_init(init_hfs_fs)
503module_exit(exit_hfs_fs)
v6.13.7
  1/*
  2 *  linux/fs/hfs/super.c
  3 *
  4 * Copyright (C) 1995-1997  Paul H. Hargrove
  5 * (C) 2003 Ardis Technologies <roman@ardistech.com>
  6 * This file may be distributed under the terms of the GNU General Public License.
  7 *
  8 * This file contains hfs_read_super(), some of the super_ops and
  9 * init_hfs_fs() and exit_hfs_fs().  The remaining super_ops are in
 10 * inode.c since they deal with inodes.
 11 *
 12 * Based on the minix file system code, (C) 1991, 1992 by Linus Torvalds
 13 */
 14
 15#include <linux/module.h>
 16#include <linux/blkdev.h>
 17#include <linux/backing-dev.h>
 18#include <linux/fs_context.h>
 19#include <linux/fs_parser.h>
 20#include <linux/mount.h>
 21#include <linux/init.h>
 22#include <linux/nls.h>
 
 23#include <linux/seq_file.h>
 24#include <linux/slab.h>
 25#include <linux/vfs.h>
 26
 27#include "hfs_fs.h"
 28#include "btree.h"
 29
 30static struct kmem_cache *hfs_inode_cachep;
 31
 32MODULE_DESCRIPTION("Apple Macintosh file system support");
 33MODULE_LICENSE("GPL");
 34
 35static int hfs_sync_fs(struct super_block *sb, int wait)
 36{
 37	hfs_mdb_commit(sb);
 38	return 0;
 39}
 40
 41/*
 42 * hfs_put_super()
 43 *
 44 * This is the put_super() entry in the super_operations structure for
 45 * HFS filesystems.  The purpose is to release the resources
 46 * associated with the superblock sb.
 47 */
 48static void hfs_put_super(struct super_block *sb)
 49{
 50	cancel_delayed_work_sync(&HFS_SB(sb)->mdb_work);
 51	hfs_mdb_close(sb);
 52	/* release the MDB's resources */
 53	hfs_mdb_put(sb);
 54}
 55
 56static void flush_mdb(struct work_struct *work)
 57{
 58	struct hfs_sb_info *sbi;
 59	struct super_block *sb;
 60
 61	sbi = container_of(work, struct hfs_sb_info, mdb_work.work);
 62	sb = sbi->sb;
 63
 64	spin_lock(&sbi->work_lock);
 65	sbi->work_queued = 0;
 66	spin_unlock(&sbi->work_lock);
 67
 68	hfs_mdb_commit(sb);
 69}
 70
 71void hfs_mark_mdb_dirty(struct super_block *sb)
 72{
 73	struct hfs_sb_info *sbi = HFS_SB(sb);
 74	unsigned long delay;
 75
 76	if (sb_rdonly(sb))
 77		return;
 78
 79	spin_lock(&sbi->work_lock);
 80	if (!sbi->work_queued) {
 81		delay = msecs_to_jiffies(dirty_writeback_interval * 10);
 82		queue_delayed_work(system_long_wq, &sbi->mdb_work, delay);
 83		sbi->work_queued = 1;
 84	}
 85	spin_unlock(&sbi->work_lock);
 86}
 87
 88/*
 89 * hfs_statfs()
 90 *
 91 * This is the statfs() entry in the super_operations structure for
 92 * HFS filesystems.  The purpose is to return various data about the
 93 * filesystem.
 94 *
 95 * changed f_files/f_ffree to reflect the fs_ablock/free_ablocks.
 96 */
 97static int hfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 98{
 99	struct super_block *sb = dentry->d_sb;
100	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
101
102	buf->f_type = HFS_SUPER_MAGIC;
103	buf->f_bsize = sb->s_blocksize;
104	buf->f_blocks = (u32)HFS_SB(sb)->fs_ablocks * HFS_SB(sb)->fs_div;
105	buf->f_bfree = (u32)HFS_SB(sb)->free_ablocks * HFS_SB(sb)->fs_div;
106	buf->f_bavail = buf->f_bfree;
107	buf->f_files = HFS_SB(sb)->fs_ablocks;
108	buf->f_ffree = HFS_SB(sb)->free_ablocks;
109	buf->f_fsid = u64_to_fsid(id);
110	buf->f_namelen = HFS_NAMELEN;
111
112	return 0;
113}
114
115static int hfs_reconfigure(struct fs_context *fc)
116{
117	struct super_block *sb = fc->root->d_sb;
118
119	sync_filesystem(sb);
120	fc->sb_flags |= SB_NODIRATIME;
121	if ((bool)(fc->sb_flags & SB_RDONLY) == sb_rdonly(sb))
122		return 0;
123
124	if (!(fc->sb_flags & SB_RDONLY)) {
125		if (!(HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_UNMNT))) {
126			pr_warn("filesystem was not cleanly unmounted, running fsck.hfs is recommended.  leaving read-only.\n");
127			sb->s_flags |= SB_RDONLY;
128			fc->sb_flags |= SB_RDONLY;
129		} else if (HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_SLOCK)) {
130			pr_warn("filesystem is marked locked, leaving read-only.\n");
131			sb->s_flags |= SB_RDONLY;
132			fc->sb_flags |= SB_RDONLY;
133		}
134	}
135	return 0;
136}
137
138static int hfs_show_options(struct seq_file *seq, struct dentry *root)
139{
140	struct hfs_sb_info *sbi = HFS_SB(root->d_sb);
141
142	if (sbi->s_creator != cpu_to_be32(0x3f3f3f3f))
143		seq_show_option_n(seq, "creator", (char *)&sbi->s_creator, 4);
144	if (sbi->s_type != cpu_to_be32(0x3f3f3f3f))
145		seq_show_option_n(seq, "type", (char *)&sbi->s_type, 4);
146	seq_printf(seq, ",uid=%u,gid=%u",
147			from_kuid_munged(&init_user_ns, sbi->s_uid),
148			from_kgid_munged(&init_user_ns, sbi->s_gid));
149	if (sbi->s_file_umask != 0133)
150		seq_printf(seq, ",file_umask=%o", sbi->s_file_umask);
151	if (sbi->s_dir_umask != 0022)
152		seq_printf(seq, ",dir_umask=%o", sbi->s_dir_umask);
153	if (sbi->part >= 0)
154		seq_printf(seq, ",part=%u", sbi->part);
155	if (sbi->session >= 0)
156		seq_printf(seq, ",session=%u", sbi->session);
157	if (sbi->nls_disk)
158		seq_printf(seq, ",codepage=%s", sbi->nls_disk->charset);
159	if (sbi->nls_io)
160		seq_printf(seq, ",iocharset=%s", sbi->nls_io->charset);
161	if (sbi->s_quiet)
162		seq_printf(seq, ",quiet");
163	return 0;
164}
165
166static struct inode *hfs_alloc_inode(struct super_block *sb)
167{
168	struct hfs_inode_info *i;
169
170	i = alloc_inode_sb(sb, hfs_inode_cachep, GFP_KERNEL);
171	return i ? &i->vfs_inode : NULL;
172}
173
174static void hfs_free_inode(struct inode *inode)
175{
176	kmem_cache_free(hfs_inode_cachep, HFS_I(inode));
177}
178
179static const struct super_operations hfs_super_operations = {
180	.alloc_inode	= hfs_alloc_inode,
181	.free_inode	= hfs_free_inode,
182	.write_inode	= hfs_write_inode,
183	.evict_inode	= hfs_evict_inode,
184	.put_super	= hfs_put_super,
185	.sync_fs	= hfs_sync_fs,
186	.statfs		= hfs_statfs,
 
187	.show_options	= hfs_show_options,
188};
189
190enum {
191	opt_uid, opt_gid, opt_umask, opt_file_umask, opt_dir_umask,
192	opt_part, opt_session, opt_type, opt_creator, opt_quiet,
193	opt_codepage, opt_iocharset,
 
194};
195
196static const struct fs_parameter_spec hfs_param_spec[] = {
197	fsparam_u32	("uid",		opt_uid),
198	fsparam_u32	("gid",		opt_gid),
199	fsparam_u32oct	("umask",	opt_umask),
200	fsparam_u32oct	("file_umask",	opt_file_umask),
201	fsparam_u32oct	("dir_umask",	opt_dir_umask),
202	fsparam_u32	("part",	opt_part),
203	fsparam_u32	("session",	opt_session),
204	fsparam_string	("type",	opt_type),
205	fsparam_string	("creator",	opt_creator),
206	fsparam_flag	("quiet",	opt_quiet),
207	fsparam_string	("codepage",	opt_codepage),
208	fsparam_string	("iocharset",	opt_iocharset),
209	{}
210};
211
 
 
 
 
 
 
 
 
212/*
213 * hfs_parse_param()
214 *
215 * This function is called by the vfs to parse the mount options.
 
216 */
217static int hfs_parse_param(struct fs_context *fc, struct fs_parameter *param)
218{
219	struct hfs_sb_info *hsb = fc->s_fs_info;
220	struct fs_parse_result result;
221	int opt;
222
223	/* hfs does not honor any fs-specific options on remount */
224	if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE)
225		return 0;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
226
227	opt = fs_parse(fc, hfs_param_spec, param, &result);
228	if (opt < 0)
229		return opt;
230
231	switch (opt) {
232	case opt_uid:
233		hsb->s_uid = result.uid;
234		break;
235	case opt_gid:
236		hsb->s_gid = result.gid;
237		break;
238	case opt_umask:
239		hsb->s_file_umask = (umode_t)result.uint_32;
240		hsb->s_dir_umask = (umode_t)result.uint_32;
241		break;
242	case opt_file_umask:
243		hsb->s_file_umask = (umode_t)result.uint_32;
244		break;
245	case opt_dir_umask:
246		hsb->s_dir_umask = (umode_t)result.uint_32;
247		break;
248	case opt_part:
249		hsb->part = result.uint_32;
250		break;
251	case opt_session:
252		hsb->session = result.uint_32;
253		break;
254	case opt_type:
255		if (strlen(param->string) != 4) {
256			pr_err("type requires a 4 character value\n");
257			return -EINVAL;
258		}
259		memcpy(&hsb->s_type, param->string, 4);
260		break;
261	case opt_creator:
262		if (strlen(param->string) != 4) {
263			pr_err("creator requires a 4 character value\n");
264			return -EINVAL;
265		}
266		memcpy(&hsb->s_creator, param->string, 4);
267		break;
268	case opt_quiet:
269		hsb->s_quiet = 1;
270		break;
271	case opt_codepage:
272		if (hsb->nls_disk) {
273			pr_err("unable to change codepage\n");
274			return -EINVAL;
275		}
276		hsb->nls_disk = load_nls(param->string);
277		if (!hsb->nls_disk) {
278			pr_err("unable to load codepage \"%s\"\n",
279					param->string);
280			return -EINVAL;
281		}
282		break;
283	case opt_iocharset:
284		if (hsb->nls_io) {
285			pr_err("unable to change iocharset\n");
286			return -EINVAL;
287		}
288		hsb->nls_io = load_nls(param->string);
289		if (!hsb->nls_io) {
290			pr_err("unable to load iocharset \"%s\"\n",
291					param->string);
292			return -EINVAL;
293		}
294		break;
295	default:
296		return -EINVAL;
297	}
 
 
298
299	return 0;
300}
301
302/*
303 * hfs_read_super()
304 *
305 * This is the function that is responsible for mounting an HFS
306 * filesystem.	It performs all the tasks necessary to get enough data
307 * from the disk to read the root inode.  This includes parsing the
308 * mount options, dealing with Macintosh partitions, reading the
309 * superblock and the allocation bitmap blocks, calling
310 * hfs_btree_init() to get the necessary data about the extents and
311 * catalog B-trees and, finally, reading the root inode into memory.
312 */
313static int hfs_fill_super(struct super_block *sb, struct fs_context *fc)
314{
315	struct hfs_sb_info *sbi = HFS_SB(sb);
316	struct hfs_find_data fd;
317	hfs_cat_rec rec;
318	struct inode *root_inode;
319	int silent = fc->sb_flags & SB_SILENT;
320	int res;
321
322	/* load_nls_default does not fail */
323	if (sbi->nls_disk && !sbi->nls_io)
324		sbi->nls_io = load_nls_default();
325	sbi->s_dir_umask &= 0777;
326	sbi->s_file_umask &= 0577;
327
 
 
328	spin_lock_init(&sbi->work_lock);
329	INIT_DELAYED_WORK(&sbi->mdb_work, flush_mdb);
330
331	sbi->sb = sb;
 
 
 
 
 
332	sb->s_op = &hfs_super_operations;
333	sb->s_xattr = hfs_xattr_handlers;
334	sb->s_flags |= SB_NODIRATIME;
335	mutex_init(&sbi->bitmap_lock);
336
337	res = hfs_mdb_get(sb);
338	if (res) {
339		if (!silent)
340			pr_warn("can't find a HFS filesystem on dev %s\n",
341				hfs_mdb_name(sb));
342		res = -EINVAL;
343		goto bail;
344	}
345
346	/* try to get the root inode */
347	res = hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
348	if (res)
349		goto bail_no_root;
350	res = hfs_cat_find_brec(sb, HFS_ROOT_CNID, &fd);
351	if (!res) {
352		if (fd.entrylength != sizeof(rec.dir)) {
353			res =  -EIO;
354			goto bail_hfs_find;
355		}
356		hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, fd.entrylength);
357		if (rec.type != HFS_CDR_DIR)
358			res = -EIO;
359	}
360	if (res)
361		goto bail_hfs_find;
362	res = -EINVAL;
363	root_inode = hfs_iget(sb, &fd.search_key->cat, &rec);
364	hfs_find_exit(&fd);
365	if (!root_inode)
366		goto bail_no_root;
367
368	sb->s_d_op = &hfs_dentry_operations;
369	res = -ENOMEM;
370	sb->s_root = d_make_root(root_inode);
371	if (!sb->s_root)
372		goto bail_no_root;
373
374	/* everything's okay */
375	return 0;
376
377bail_hfs_find:
378	hfs_find_exit(&fd);
379bail_no_root:
380	pr_err("get root inode failed\n");
381bail:
382	hfs_mdb_put(sb);
383	return res;
384}
385
386static int hfs_get_tree(struct fs_context *fc)
 
387{
388	return get_tree_bdev(fc, hfs_fill_super);
389}
390
391static void hfs_free_fc(struct fs_context *fc)
392{
393	kfree(fc->s_fs_info);
394}
395
396static const struct fs_context_operations hfs_context_ops = {
397	.parse_param	= hfs_parse_param,
398	.get_tree	= hfs_get_tree,
399	.reconfigure	= hfs_reconfigure,
400	.free		= hfs_free_fc,
401};
402
403static int hfs_init_fs_context(struct fs_context *fc)
404{
405	struct hfs_sb_info *hsb;
406
407	hsb = kzalloc(sizeof(struct hfs_sb_info), GFP_KERNEL);
408	if (!hsb)
409		return -ENOMEM;
410
411	fc->s_fs_info = hsb;
412	fc->ops = &hfs_context_ops;
413
414	if (fc->purpose != FS_CONTEXT_FOR_RECONFIGURE) {
415		/* initialize options with defaults */
416		hsb->s_uid = current_uid();
417		hsb->s_gid = current_gid();
418		hsb->s_file_umask = 0133;
419		hsb->s_dir_umask = 0022;
420		hsb->s_type = cpu_to_be32(0x3f3f3f3f); /* == '????' */
421		hsb->s_creator = cpu_to_be32(0x3f3f3f3f); /* == '????' */
422		hsb->s_quiet = 0;
423		hsb->part = -1;
424		hsb->session = -1;
425	}
426
427	return 0;
428}
429
430static struct file_system_type hfs_fs_type = {
431	.owner		= THIS_MODULE,
432	.name		= "hfs",
 
433	.kill_sb	= kill_block_super,
434	.fs_flags	= FS_REQUIRES_DEV,
435	.init_fs_context = hfs_init_fs_context,
436};
437MODULE_ALIAS_FS("hfs");
438
439static void hfs_init_once(void *p)
440{
441	struct hfs_inode_info *i = p;
442
443	inode_init_once(&i->vfs_inode);
444}
445
446static int __init init_hfs_fs(void)
447{
448	int err;
449
450	hfs_inode_cachep = kmem_cache_create("hfs_inode_cache",
451		sizeof(struct hfs_inode_info), 0,
452		SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, hfs_init_once);
453	if (!hfs_inode_cachep)
454		return -ENOMEM;
455	err = register_filesystem(&hfs_fs_type);
456	if (err)
457		kmem_cache_destroy(hfs_inode_cachep);
458	return err;
459}
460
461static void __exit exit_hfs_fs(void)
462{
463	unregister_filesystem(&hfs_fs_type);
464
465	/*
466	 * Make sure all delayed rcu free inodes are flushed before we
467	 * destroy cache.
468	 */
469	rcu_barrier();
470	kmem_cache_destroy(hfs_inode_cachep);
471}
472
473module_init(init_hfs_fs)
474module_exit(exit_hfs_fs)