Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/ext2/super.c |
| 3 | * |
| 4 | * Copyright (C) 1992, 1993, 1994, 1995 |
| 5 | * Remy Card (card@masi.ibp.fr) |
| 6 | * Laboratoire MASI - Institut Blaise Pascal |
| 7 | * Universite Pierre et Marie Curie (Paris VI) |
| 8 | * |
| 9 | * from |
| 10 | * |
| 11 | * linux/fs/minix/inode.c |
| 12 | * |
| 13 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 14 | * |
| 15 | * Big-endian to little-endian byte-swapping/bitmaps by |
| 16 | * David S. Miller (davem@caip.rutgers.edu), 1995 |
| 17 | */ |
| 18 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/module.h> |
| 20 | #include <linux/string.h> |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 21 | #include <linux/fs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/slab.h> |
| 23 | #include <linux/init.h> |
| 24 | #include <linux/blkdev.h> |
| 25 | #include <linux/parser.h> |
| 26 | #include <linux/random.h> |
| 27 | #include <linux/buffer_head.h> |
Christoph Hellwig | a569425 | 2007-07-17 04:04:28 -0700 | [diff] [blame] | 28 | #include <linux/exportfs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <linux/vfs.h> |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 30 | #include <linux/seq_file.h> |
| 31 | #include <linux/mount.h> |
vignesh babu | d8ea6cf | 2007-10-16 23:27:14 -0700 | [diff] [blame] | 32 | #include <linux/log2.h> |
Jan Kara | 74abb98 | 2008-07-25 01:46:51 -0700 | [diff] [blame] | 33 | #include <linux/quotaops.h> |
Linus Torvalds | 7c0f6ba | 2016-12-24 11:46:01 -0800 | [diff] [blame] | 34 | #include <linux/uaccess.h> |
Dan Williams | ef510424 | 2017-05-08 10:55:27 -0700 | [diff] [blame] | 35 | #include <linux/dax.h> |
Jeff Layton | e1d747d | 2017-12-11 06:35:14 -0500 | [diff] [blame] | 36 | #include <linux/iversion.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | #include "ext2.h" |
| 38 | #include "xattr.h" |
| 39 | #include "acl.h" |
| 40 | |
Jan Kara | 6554766 | 2017-04-05 13:32:52 +0200 | [diff] [blame] | 41 | static void ext2_write_super(struct super_block *sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | static int ext2_remount (struct super_block * sb, int * flags, char * data); |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 43 | static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf); |
Christoph Hellwig | 40f31dd | 2009-06-08 10:04:17 +0200 | [diff] [blame] | 44 | static int ext2_sync_fs(struct super_block *sb, int wait); |
Jan Kara | 1e8b212 | 2012-06-12 16:20:46 +0200 | [diff] [blame] | 45 | static int ext2_freeze(struct super_block *sb); |
| 46 | static int ext2_unfreeze(struct super_block *sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
Joe Perches | 23a2ad6 | 2010-11-09 10:16:03 -0800 | [diff] [blame] | 48 | void ext2_error(struct super_block *sb, const char *function, |
| 49 | const char *fmt, ...) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | { |
Joe Perches | 23a2ad6 | 2010-11-09 10:16:03 -0800 | [diff] [blame] | 51 | struct va_format vaf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | va_list args; |
| 53 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
| 54 | struct ext2_super_block *es = sbi->s_es; |
| 55 | |
David Howells | bc98a42 | 2017-07-17 08:45:34 +0100 | [diff] [blame] | 56 | if (!sb_rdonly(sb)) { |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame] | 57 | spin_lock(&sbi->s_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | sbi->s_mount_state |= EXT2_ERROR_FS; |
Marcin Slusarz | 31f68e1 | 2008-04-28 02:16:00 -0700 | [diff] [blame] | 59 | es->s_state |= cpu_to_le16(EXT2_ERROR_FS); |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame] | 60 | spin_unlock(&sbi->s_lock); |
Jan Blunck | ee6921e | 2010-04-14 14:38:36 +0200 | [diff] [blame] | 61 | ext2_sync_super(sb, es, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | } |
| 63 | |
| 64 | va_start(args, fmt); |
Joe Perches | 23a2ad6 | 2010-11-09 10:16:03 -0800 | [diff] [blame] | 65 | |
| 66 | vaf.fmt = fmt; |
| 67 | vaf.va = &args; |
| 68 | |
| 69 | printk(KERN_CRIT "EXT2-fs (%s): error: %s: %pV\n", |
| 70 | sb->s_id, function, &vaf); |
| 71 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | va_end(args); |
| 73 | |
| 74 | if (test_opt(sb, ERRORS_PANIC)) |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 75 | panic("EXT2-fs: panic from previous error\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | if (test_opt(sb, ERRORS_RO)) { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 77 | ext2_msg(sb, KERN_CRIT, |
| 78 | "error: remounting filesystem read-only"); |
Linus Torvalds | 1751e8a | 2017-11-27 13:05:09 -0800 | [diff] [blame] | 79 | sb->s_flags |= SB_RDONLY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | } |
| 81 | } |
| 82 | |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 83 | void ext2_msg(struct super_block *sb, const char *prefix, |
| 84 | const char *fmt, ...) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | { |
Joe Perches | 23a2ad6 | 2010-11-09 10:16:03 -0800 | [diff] [blame] | 86 | struct va_format vaf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | va_list args; |
| 88 | |
| 89 | va_start(args, fmt); |
Joe Perches | 23a2ad6 | 2010-11-09 10:16:03 -0800 | [diff] [blame] | 90 | |
| 91 | vaf.fmt = fmt; |
| 92 | vaf.va = &args; |
| 93 | |
| 94 | printk("%sEXT2-fs (%s): %pV\n", prefix, sb->s_id, &vaf); |
| 95 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | va_end(args); |
| 97 | } |
| 98 | |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame] | 99 | /* |
| 100 | * This must be called with sbi->s_lock held. |
| 101 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | void ext2_update_dynamic_rev(struct super_block *sb) |
| 103 | { |
| 104 | struct ext2_super_block *es = EXT2_SB(sb)->s_es; |
| 105 | |
| 106 | if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV) |
| 107 | return; |
| 108 | |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 109 | ext2_msg(sb, KERN_WARNING, |
| 110 | "warning: updating to rev %d because of " |
| 111 | "new feature flag, running e2fsck is recommended", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | EXT2_DYNAMIC_REV); |
| 113 | |
| 114 | es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO); |
| 115 | es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE); |
| 116 | es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV); |
| 117 | /* leave es->s_feature_*compat flags alone */ |
| 118 | /* es->s_uuid will be set by e2fsck if empty */ |
| 119 | |
| 120 | /* |
| 121 | * The rest of the superblock fields should be zero, and if not it |
| 122 | * means they are likely already in use, so leave them alone. We |
| 123 | * can leave it up to e2fsck to clean up any inconsistencies there. |
| 124 | */ |
| 125 | } |
| 126 | |
Jan Kara | 161f3b7 | 2017-04-06 17:02:09 +0200 | [diff] [blame] | 127 | #ifdef CONFIG_QUOTA |
| 128 | static int ext2_quota_off(struct super_block *sb, int type); |
| 129 | |
| 130 | static void ext2_quota_off_umount(struct super_block *sb) |
| 131 | { |
| 132 | int type; |
| 133 | |
| 134 | for (type = 0; type < MAXQUOTAS; type++) |
| 135 | ext2_quota_off(sb, type); |
| 136 | } |
| 137 | #else |
| 138 | static inline void ext2_quota_off_umount(struct super_block *sb) |
| 139 | { |
| 140 | } |
| 141 | #endif |
| 142 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | static void ext2_put_super (struct super_block * sb) |
| 144 | { |
| 145 | int db_count; |
| 146 | int i; |
| 147 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
| 148 | |
Jan Kara | 161f3b7 | 2017-04-06 17:02:09 +0200 | [diff] [blame] | 149 | ext2_quota_off_umount(sb); |
Christoph Hellwig | e0ccfd9 | 2010-05-19 07:16:42 -0400 | [diff] [blame] | 150 | |
Tahsin Erdogan | 4738740 | 2017-06-22 11:28:55 -0400 | [diff] [blame] | 151 | if (sbi->s_ea_block_cache) { |
| 152 | ext2_xattr_destroy_cache(sbi->s_ea_block_cache); |
| 153 | sbi->s_ea_block_cache = NULL; |
Jan Kara | be0726d | 2016-02-22 11:56:38 -0500 | [diff] [blame] | 154 | } |
David Howells | bc98a42 | 2017-07-17 08:45:34 +0100 | [diff] [blame] | 155 | if (!sb_rdonly(sb)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | struct ext2_super_block *es = sbi->s_es; |
| 157 | |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame] | 158 | spin_lock(&sbi->s_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | es->s_state = cpu_to_le16(sbi->s_mount_state); |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame] | 160 | spin_unlock(&sbi->s_lock); |
Jan Blunck | ee6921e | 2010-04-14 14:38:36 +0200 | [diff] [blame] | 161 | ext2_sync_super(sb, es, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | } |
| 163 | db_count = sbi->s_gdb_count; |
| 164 | for (i = 0; i < db_count; i++) |
| 165 | if (sbi->s_group_desc[i]) |
| 166 | brelse (sbi->s_group_desc[i]); |
| 167 | kfree(sbi->s_group_desc); |
| 168 | kfree(sbi->s_debts); |
| 169 | percpu_counter_destroy(&sbi->s_freeblocks_counter); |
| 170 | percpu_counter_destroy(&sbi->s_freeinodes_counter); |
| 171 | percpu_counter_destroy(&sbi->s_dirs_counter); |
| 172 | brelse (sbi->s_sbh); |
| 173 | sb->s_fs_info = NULL; |
Pekka J Enberg | 18a82eb | 2009-01-07 18:07:19 -0800 | [diff] [blame] | 174 | kfree(sbi->s_blockgroup_lock); |
Dan Williams | 8cf037a | 2017-08-30 09:43:34 -0700 | [diff] [blame] | 175 | fs_put_dax(sbi->s_daxdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | kfree(sbi); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | } |
| 178 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 179 | static struct kmem_cache * ext2_inode_cachep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | |
| 181 | static struct inode *ext2_alloc_inode(struct super_block *sb) |
| 182 | { |
| 183 | struct ext2_inode_info *ei; |
Himangi Saraogi | e625b31 | 2014-06-10 20:11:18 +0530 | [diff] [blame] | 184 | ei = kmem_cache_alloc(ext2_inode_cachep, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | if (!ei) |
| 186 | return NULL; |
Martin J. Bligh | a686cd8 | 2007-10-16 23:30:46 -0700 | [diff] [blame] | 187 | ei->i_block_alloc_info = NULL; |
Jeff Layton | e1d747d | 2017-12-11 06:35:14 -0500 | [diff] [blame] | 188 | inode_set_iversion(&ei->vfs_inode, 1); |
Jan Kara | 6424111 | 2014-09-25 16:44:45 +0200 | [diff] [blame] | 189 | #ifdef CONFIG_QUOTA |
| 190 | memset(&ei->i_dquot, 0, sizeof(ei->i_dquot)); |
| 191 | #endif |
| 192 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | return &ei->vfs_inode; |
| 194 | } |
| 195 | |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 196 | static void ext2_i_callback(struct rcu_head *head) |
| 197 | { |
| 198 | struct inode *inode = container_of(head, struct inode, i_rcu); |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 199 | kmem_cache_free(ext2_inode_cachep, EXT2_I(inode)); |
| 200 | } |
| 201 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | static void ext2_destroy_inode(struct inode *inode) |
| 203 | { |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 204 | call_rcu(&inode->i_rcu, ext2_i_callback); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | } |
| 206 | |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 207 | static void init_once(void *foo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | { |
| 209 | struct ext2_inode_info *ei = (struct ext2_inode_info *) foo; |
| 210 | |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 211 | rwlock_init(&ei->i_meta_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | #ifdef CONFIG_EXT2_FS_XATTR |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 213 | init_rwsem(&ei->xattr_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | #endif |
Martin J. Bligh | a686cd8 | 2007-10-16 23:30:46 -0700 | [diff] [blame] | 215 | mutex_init(&ei->truncate_mutex); |
Ross Zwisler | 5726b27 | 2015-10-13 16:25:37 -0600 | [diff] [blame] | 216 | #ifdef CONFIG_FS_DAX |
| 217 | init_rwsem(&ei->dax_sem); |
| 218 | #endif |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 219 | inode_init_once(&ei->vfs_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | } |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 221 | |
Fabian Frederick | 0903353 | 2014-02-01 16:02:02 +0800 | [diff] [blame] | 222 | static int __init init_inodecache(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | { |
David Windsor | 85212d4 | 2017-06-10 22:50:35 -0400 | [diff] [blame] | 224 | ext2_inode_cachep = kmem_cache_create_usercopy("ext2_inode_cache", |
| 225 | sizeof(struct ext2_inode_info), 0, |
| 226 | (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD| |
| 227 | SLAB_ACCOUNT), |
| 228 | offsetof(struct ext2_inode_info, i_data), |
| 229 | sizeof_field(struct ext2_inode_info, i_data), |
| 230 | init_once); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | if (ext2_inode_cachep == NULL) |
| 232 | return -ENOMEM; |
| 233 | return 0; |
| 234 | } |
| 235 | |
| 236 | static void destroy_inodecache(void) |
| 237 | { |
Kirill A. Shutemov | 8c0a853 | 2012-09-26 11:33:07 +1000 | [diff] [blame] | 238 | /* |
| 239 | * Make sure all delayed rcu free inodes are flushed before we |
| 240 | * destroy cache. |
| 241 | */ |
| 242 | rcu_barrier(); |
Alexey Dobriyan | 1a1d92c | 2006-09-27 01:49:40 -0700 | [diff] [blame] | 243 | kmem_cache_destroy(ext2_inode_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | } |
| 245 | |
Al Viro | 34c80b1 | 2011-12-08 21:32:45 -0500 | [diff] [blame] | 246 | static int ext2_show_options(struct seq_file *seq, struct dentry *root) |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 247 | { |
Al Viro | 34c80b1 | 2011-12-08 21:32:45 -0500 | [diff] [blame] | 248 | struct super_block *sb = root->d_sb; |
Miklos Szeredi | 93d44cb | 2007-10-16 23:26:26 -0700 | [diff] [blame] | 249 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
| 250 | struct ext2_super_block *es = sbi->s_es; |
| 251 | unsigned long def_mount_opts; |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 252 | |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame] | 253 | spin_lock(&sbi->s_lock); |
Miklos Szeredi | 93d44cb | 2007-10-16 23:26:26 -0700 | [diff] [blame] | 254 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); |
| 255 | |
| 256 | if (sbi->s_sb_block != 1) |
| 257 | seq_printf(seq, ",sb=%lu", sbi->s_sb_block); |
| 258 | if (test_opt(sb, MINIX_DF)) |
| 259 | seq_puts(seq, ",minixdf"); |
| 260 | if (test_opt(sb, GRPID)) |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 261 | seq_puts(seq, ",grpid"); |
Miklos Szeredi | 93d44cb | 2007-10-16 23:26:26 -0700 | [diff] [blame] | 262 | if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS)) |
| 263 | seq_puts(seq, ",nogrpid"); |
Eric W. Biederman | b8a9f9e | 2012-02-07 15:39:12 -0800 | [diff] [blame] | 264 | if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT2_DEF_RESUID)) || |
Miklos Szeredi | 93d44cb | 2007-10-16 23:26:26 -0700 | [diff] [blame] | 265 | le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) { |
Eric W. Biederman | b8a9f9e | 2012-02-07 15:39:12 -0800 | [diff] [blame] | 266 | seq_printf(seq, ",resuid=%u", |
| 267 | from_kuid_munged(&init_user_ns, sbi->s_resuid)); |
Miklos Szeredi | 93d44cb | 2007-10-16 23:26:26 -0700 | [diff] [blame] | 268 | } |
Eric W. Biederman | b8a9f9e | 2012-02-07 15:39:12 -0800 | [diff] [blame] | 269 | if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT2_DEF_RESGID)) || |
Miklos Szeredi | 93d44cb | 2007-10-16 23:26:26 -0700 | [diff] [blame] | 270 | le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) { |
Eric W. Biederman | b8a9f9e | 2012-02-07 15:39:12 -0800 | [diff] [blame] | 271 | seq_printf(seq, ",resgid=%u", |
| 272 | from_kgid_munged(&init_user_ns, sbi->s_resgid)); |
Miklos Szeredi | 93d44cb | 2007-10-16 23:26:26 -0700 | [diff] [blame] | 273 | } |
Aneesh Kumar K.V | 14e11e1 | 2008-02-06 01:36:17 -0800 | [diff] [blame] | 274 | if (test_opt(sb, ERRORS_RO)) { |
Miklos Szeredi | 93d44cb | 2007-10-16 23:26:26 -0700 | [diff] [blame] | 275 | int def_errors = le16_to_cpu(es->s_errors); |
| 276 | |
| 277 | if (def_errors == EXT2_ERRORS_PANIC || |
Aneesh Kumar K.V | 14e11e1 | 2008-02-06 01:36:17 -0800 | [diff] [blame] | 278 | def_errors == EXT2_ERRORS_CONTINUE) { |
| 279 | seq_puts(seq, ",errors=remount-ro"); |
Miklos Szeredi | 93d44cb | 2007-10-16 23:26:26 -0700 | [diff] [blame] | 280 | } |
| 281 | } |
Aneesh Kumar K.V | 14e11e1 | 2008-02-06 01:36:17 -0800 | [diff] [blame] | 282 | if (test_opt(sb, ERRORS_CONT)) |
| 283 | seq_puts(seq, ",errors=continue"); |
Miklos Szeredi | 93d44cb | 2007-10-16 23:26:26 -0700 | [diff] [blame] | 284 | if (test_opt(sb, ERRORS_PANIC)) |
| 285 | seq_puts(seq, ",errors=panic"); |
| 286 | if (test_opt(sb, NO_UID32)) |
| 287 | seq_puts(seq, ",nouid32"); |
| 288 | if (test_opt(sb, DEBUG)) |
| 289 | seq_puts(seq, ",debug"); |
| 290 | if (test_opt(sb, OLDALLOC)) |
| 291 | seq_puts(seq, ",oldalloc"); |
| 292 | |
| 293 | #ifdef CONFIG_EXT2_FS_XATTR |
| 294 | if (test_opt(sb, XATTR_USER)) |
| 295 | seq_puts(seq, ",user_xattr"); |
| 296 | if (!test_opt(sb, XATTR_USER) && |
| 297 | (def_mount_opts & EXT2_DEFM_XATTR_USER)) { |
| 298 | seq_puts(seq, ",nouser_xattr"); |
| 299 | } |
| 300 | #endif |
| 301 | |
| 302 | #ifdef CONFIG_EXT2_FS_POSIX_ACL |
| 303 | if (test_opt(sb, POSIX_ACL)) |
| 304 | seq_puts(seq, ",acl"); |
| 305 | if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL)) |
| 306 | seq_puts(seq, ",noacl"); |
| 307 | #endif |
| 308 | |
| 309 | if (test_opt(sb, NOBH)) |
| 310 | seq_puts(seq, ",nobh"); |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 311 | |
| 312 | #if defined(CONFIG_QUOTA) |
| 313 | if (sbi->s_mount_opt & EXT2_MOUNT_USRQUOTA) |
| 314 | seq_puts(seq, ",usrquota"); |
| 315 | |
| 316 | if (sbi->s_mount_opt & EXT2_MOUNT_GRPQUOTA) |
| 317 | seq_puts(seq, ",grpquota"); |
| 318 | #endif |
| 319 | |
Matthew Wilcox | 6cd176a | 2015-02-16 15:59:25 -0800 | [diff] [blame] | 320 | #ifdef CONFIG_FS_DAX |
Carsten Otte | 8354179 | 2006-02-03 03:04:25 -0800 | [diff] [blame] | 321 | if (sbi->s_mount_opt & EXT2_MOUNT_XIP) |
| 322 | seq_puts(seq, ",xip"); |
Matthew Wilcox | 9c3ce9e | 2015-02-16 15:59:31 -0800 | [diff] [blame] | 323 | if (sbi->s_mount_opt & EXT2_MOUNT_DAX) |
| 324 | seq_puts(seq, ",dax"); |
Carsten Otte | 8354179 | 2006-02-03 03:04:25 -0800 | [diff] [blame] | 325 | #endif |
| 326 | |
Miklos Szeredi | 35c879d | 2008-02-08 04:21:42 -0800 | [diff] [blame] | 327 | if (!test_opt(sb, RESERVATION)) |
| 328 | seq_puts(seq, ",noreservation"); |
| 329 | |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame] | 330 | spin_unlock(&sbi->s_lock); |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 331 | return 0; |
| 332 | } |
| 333 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | #ifdef CONFIG_QUOTA |
| 335 | static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off); |
| 336 | static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off); |
Jan Kara | 161f3b7 | 2017-04-06 17:02:09 +0200 | [diff] [blame] | 337 | static int ext2_quota_on(struct super_block *sb, int type, int format_id, |
| 338 | const struct path *path); |
Jan Kara | 6424111 | 2014-09-25 16:44:45 +0200 | [diff] [blame] | 339 | static struct dquot **ext2_get_dquots(struct inode *inode) |
| 340 | { |
| 341 | return EXT2_I(inode)->i_dquot; |
| 342 | } |
Jan Kara | 161f3b7 | 2017-04-06 17:02:09 +0200 | [diff] [blame] | 343 | |
| 344 | static const struct quotactl_ops ext2_quotactl_ops = { |
| 345 | .quota_on = ext2_quota_on, |
| 346 | .quota_off = ext2_quota_off, |
| 347 | .quota_sync = dquot_quota_sync, |
| 348 | .get_state = dquot_get_state, |
| 349 | .set_info = dquot_set_dqinfo, |
| 350 | .get_dqblk = dquot_get_dqblk, |
| 351 | .set_dqblk = dquot_set_dqblk, |
| 352 | .get_nextdqblk = dquot_get_next_dqblk, |
| 353 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | #endif |
| 355 | |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 356 | static const struct super_operations ext2_sops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | .alloc_inode = ext2_alloc_inode, |
| 358 | .destroy_inode = ext2_destroy_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | .write_inode = ext2_write_inode, |
Al Viro | 72edc4d | 2010-06-04 23:32:28 -0400 | [diff] [blame] | 360 | .evict_inode = ext2_evict_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | .put_super = ext2_put_super, |
Christoph Hellwig | 40f31dd | 2009-06-08 10:04:17 +0200 | [diff] [blame] | 362 | .sync_fs = ext2_sync_fs, |
Jan Kara | 1e8b212 | 2012-06-12 16:20:46 +0200 | [diff] [blame] | 363 | .freeze_fs = ext2_freeze, |
| 364 | .unfreeze_fs = ext2_unfreeze, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | .statfs = ext2_statfs, |
| 366 | .remount_fs = ext2_remount, |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 367 | .show_options = ext2_show_options, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | #ifdef CONFIG_QUOTA |
| 369 | .quota_read = ext2_quota_read, |
| 370 | .quota_write = ext2_quota_write, |
Jan Kara | 6424111 | 2014-09-25 16:44:45 +0200 | [diff] [blame] | 371 | .get_dquots = ext2_get_dquots, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | #endif |
| 373 | }; |
| 374 | |
Christoph Hellwig | 2e4c68e | 2007-10-21 16:42:07 -0700 | [diff] [blame] | 375 | static struct inode *ext2_nfs_get_inode(struct super_block *sb, |
| 376 | u64 ino, u32 generation) |
NeilBrown | ecaff75 | 2006-09-16 12:15:37 -0700 | [diff] [blame] | 377 | { |
NeilBrown | ecaff75 | 2006-09-16 12:15:37 -0700 | [diff] [blame] | 378 | struct inode *inode; |
NeilBrown | ecaff75 | 2006-09-16 12:15:37 -0700 | [diff] [blame] | 379 | |
| 380 | if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO) |
| 381 | return ERR_PTR(-ESTALE); |
| 382 | if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count)) |
| 383 | return ERR_PTR(-ESTALE); |
| 384 | |
Li Haifeng | f32948d | 2011-08-30 17:32:50 +0200 | [diff] [blame] | 385 | /* |
| 386 | * ext2_iget isn't quite right if the inode is currently unallocated! |
| 387 | * However ext2_iget currently does appropriate checks to handle stale |
| 388 | * inodes so everything is OK. |
NeilBrown | ecaff75 | 2006-09-16 12:15:37 -0700 | [diff] [blame] | 389 | */ |
David Howells | 52fcf70 | 2008-02-07 00:15:35 -0800 | [diff] [blame] | 390 | inode = ext2_iget(sb, ino); |
| 391 | if (IS_ERR(inode)) |
| 392 | return ERR_CAST(inode); |
| 393 | if (generation && inode->i_generation != generation) { |
NeilBrown | ecaff75 | 2006-09-16 12:15:37 -0700 | [diff] [blame] | 394 | /* we didn't find the right inode.. */ |
| 395 | iput(inode); |
| 396 | return ERR_PTR(-ESTALE); |
| 397 | } |
Christoph Hellwig | 2e4c68e | 2007-10-21 16:42:07 -0700 | [diff] [blame] | 398 | return inode; |
| 399 | } |
| 400 | |
| 401 | static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid, |
| 402 | int fh_len, int fh_type) |
| 403 | { |
| 404 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, |
| 405 | ext2_nfs_get_inode); |
| 406 | } |
| 407 | |
| 408 | static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid, |
| 409 | int fh_len, int fh_type) |
| 410 | { |
| 411 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, |
| 412 | ext2_nfs_get_inode); |
NeilBrown | ecaff75 | 2006-09-16 12:15:37 -0700 | [diff] [blame] | 413 | } |
| 414 | |
Christoph Hellwig | 3965516 | 2007-10-21 16:42:17 -0700 | [diff] [blame] | 415 | static const struct export_operations ext2_export_ops = { |
Christoph Hellwig | 2e4c68e | 2007-10-21 16:42:07 -0700 | [diff] [blame] | 416 | .fh_to_dentry = ext2_fh_to_dentry, |
| 417 | .fh_to_parent = ext2_fh_to_parent, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | .get_parent = ext2_get_parent, |
| 419 | }; |
| 420 | |
| 421 | static unsigned long get_sb_block(void **data) |
| 422 | { |
| 423 | unsigned long sb_block; |
| 424 | char *options = (char *) *data; |
| 425 | |
| 426 | if (!options || strncmp(options, "sb=", 3) != 0) |
| 427 | return 1; /* Default location */ |
| 428 | options += 3; |
| 429 | sb_block = simple_strtoul(options, &options, 0); |
| 430 | if (*options && *options != ',') { |
| 431 | printk("EXT2-fs: Invalid sb specification: %s\n", |
| 432 | (char *) *data); |
| 433 | return 1; |
| 434 | } |
| 435 | if (*options == ',') |
| 436 | options++; |
| 437 | *data = (void *) options; |
| 438 | return sb_block; |
| 439 | } |
| 440 | |
| 441 | enum { |
| 442 | Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 443 | Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, |
Adrian Bunk | 2860b73 | 2005-11-08 21:34:59 -0800 | [diff] [blame] | 444 | Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug, |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 445 | Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr, |
Matthew Wilcox | 9c3ce9e | 2015-02-16 15:59:31 -0800 | [diff] [blame] | 446 | Opt_acl, Opt_noacl, Opt_xip, Opt_dax, Opt_ignore, Opt_err, Opt_quota, |
Martin J. Bligh | a686cd8 | 2007-10-16 23:30:46 -0700 | [diff] [blame] | 447 | Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | }; |
| 449 | |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 450 | static const match_table_t tokens = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | {Opt_bsd_df, "bsddf"}, |
| 452 | {Opt_minix_df, "minixdf"}, |
| 453 | {Opt_grpid, "grpid"}, |
| 454 | {Opt_grpid, "bsdgroups"}, |
| 455 | {Opt_nogrpid, "nogrpid"}, |
| 456 | {Opt_nogrpid, "sysvgroups"}, |
| 457 | {Opt_resgid, "resgid=%u"}, |
| 458 | {Opt_resuid, "resuid=%u"}, |
| 459 | {Opt_sb, "sb=%u"}, |
| 460 | {Opt_err_cont, "errors=continue"}, |
| 461 | {Opt_err_panic, "errors=panic"}, |
| 462 | {Opt_err_ro, "errors=remount-ro"}, |
| 463 | {Opt_nouid32, "nouid32"}, |
| 464 | {Opt_nocheck, "check=none"}, |
| 465 | {Opt_nocheck, "nocheck"}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | {Opt_debug, "debug"}, |
| 467 | {Opt_oldalloc, "oldalloc"}, |
| 468 | {Opt_orlov, "orlov"}, |
| 469 | {Opt_nobh, "nobh"}, |
| 470 | {Opt_user_xattr, "user_xattr"}, |
| 471 | {Opt_nouser_xattr, "nouser_xattr"}, |
| 472 | {Opt_acl, "acl"}, |
| 473 | {Opt_noacl, "noacl"}, |
Carsten Otte | 6d79125 | 2005-06-23 22:05:26 -0700 | [diff] [blame] | 474 | {Opt_xip, "xip"}, |
Matthew Wilcox | 9c3ce9e | 2015-02-16 15:59:31 -0800 | [diff] [blame] | 475 | {Opt_dax, "dax"}, |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 476 | {Opt_grpquota, "grpquota"}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | {Opt_ignore, "noquota"}, |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 478 | {Opt_quota, "quota"}, |
| 479 | {Opt_usrquota, "usrquota"}, |
Martin J. Bligh | a686cd8 | 2007-10-16 23:30:46 -0700 | [diff] [blame] | 480 | {Opt_reservation, "reservation"}, |
| 481 | {Opt_noreservation, "noreservation"}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | {Opt_err, NULL} |
| 483 | }; |
| 484 | |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 485 | static int parse_options(char *options, struct super_block *sb, |
| 486 | struct ext2_mount_options *opts) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 488 | char *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | substring_t args[MAX_OPT_ARGS]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | int option; |
Eric W. Biederman | b8a9f9e | 2012-02-07 15:39:12 -0800 | [diff] [blame] | 491 | kuid_t uid; |
| 492 | kgid_t gid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | |
| 494 | if (!options) |
| 495 | return 1; |
| 496 | |
| 497 | while ((p = strsep (&options, ",")) != NULL) { |
| 498 | int token; |
| 499 | if (!*p) |
| 500 | continue; |
| 501 | |
| 502 | token = match_token(p, tokens, args); |
| 503 | switch (token) { |
| 504 | case Opt_bsd_df: |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 505 | clear_opt (opts->s_mount_opt, MINIX_DF); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | break; |
| 507 | case Opt_minix_df: |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 508 | set_opt (opts->s_mount_opt, MINIX_DF); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | break; |
| 510 | case Opt_grpid: |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 511 | set_opt (opts->s_mount_opt, GRPID); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | break; |
| 513 | case Opt_nogrpid: |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 514 | clear_opt (opts->s_mount_opt, GRPID); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | break; |
| 516 | case Opt_resuid: |
| 517 | if (match_int(&args[0], &option)) |
| 518 | return 0; |
Eric W. Biederman | b8a9f9e | 2012-02-07 15:39:12 -0800 | [diff] [blame] | 519 | uid = make_kuid(current_user_ns(), option); |
| 520 | if (!uid_valid(uid)) { |
| 521 | ext2_msg(sb, KERN_ERR, "Invalid uid value %d", option); |
Zhao Hongjiang | ae2cf42 | 2012-10-09 13:44:36 +0800 | [diff] [blame] | 522 | return 0; |
Eric W. Biederman | b8a9f9e | 2012-02-07 15:39:12 -0800 | [diff] [blame] | 523 | |
| 524 | } |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 525 | opts->s_resuid = uid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | break; |
| 527 | case Opt_resgid: |
| 528 | if (match_int(&args[0], &option)) |
| 529 | return 0; |
Eric W. Biederman | b8a9f9e | 2012-02-07 15:39:12 -0800 | [diff] [blame] | 530 | gid = make_kgid(current_user_ns(), option); |
| 531 | if (!gid_valid(gid)) { |
| 532 | ext2_msg(sb, KERN_ERR, "Invalid gid value %d", option); |
Zhao Hongjiang | ae2cf42 | 2012-10-09 13:44:36 +0800 | [diff] [blame] | 533 | return 0; |
Eric W. Biederman | b8a9f9e | 2012-02-07 15:39:12 -0800 | [diff] [blame] | 534 | } |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 535 | opts->s_resgid = gid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | break; |
| 537 | case Opt_sb: |
| 538 | /* handled by get_sb_block() instead of here */ |
| 539 | /* *sb_block = match_int(&args[0]); */ |
| 540 | break; |
| 541 | case Opt_err_panic: |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 542 | clear_opt (opts->s_mount_opt, ERRORS_CONT); |
| 543 | clear_opt (opts->s_mount_opt, ERRORS_RO); |
| 544 | set_opt (opts->s_mount_opt, ERRORS_PANIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | break; |
| 546 | case Opt_err_ro: |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 547 | clear_opt (opts->s_mount_opt, ERRORS_CONT); |
| 548 | clear_opt (opts->s_mount_opt, ERRORS_PANIC); |
| 549 | set_opt (opts->s_mount_opt, ERRORS_RO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | break; |
| 551 | case Opt_err_cont: |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 552 | clear_opt (opts->s_mount_opt, ERRORS_RO); |
| 553 | clear_opt (opts->s_mount_opt, ERRORS_PANIC); |
| 554 | set_opt (opts->s_mount_opt, ERRORS_CONT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | break; |
| 556 | case Opt_nouid32: |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 557 | set_opt (opts->s_mount_opt, NO_UID32); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | case Opt_nocheck: |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 560 | clear_opt (opts->s_mount_opt, CHECK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | break; |
| 562 | case Opt_debug: |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 563 | set_opt (opts->s_mount_opt, DEBUG); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | break; |
| 565 | case Opt_oldalloc: |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 566 | set_opt (opts->s_mount_opt, OLDALLOC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | break; |
| 568 | case Opt_orlov: |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 569 | clear_opt (opts->s_mount_opt, OLDALLOC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | break; |
| 571 | case Opt_nobh: |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 572 | set_opt (opts->s_mount_opt, NOBH); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | break; |
| 574 | #ifdef CONFIG_EXT2_FS_XATTR |
| 575 | case Opt_user_xattr: |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 576 | set_opt (opts->s_mount_opt, XATTR_USER); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | break; |
| 578 | case Opt_nouser_xattr: |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 579 | clear_opt (opts->s_mount_opt, XATTR_USER); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | break; |
| 581 | #else |
| 582 | case Opt_user_xattr: |
| 583 | case Opt_nouser_xattr: |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 584 | ext2_msg(sb, KERN_INFO, "(no)user_xattr options" |
| 585 | "not supported"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | break; |
| 587 | #endif |
| 588 | #ifdef CONFIG_EXT2_FS_POSIX_ACL |
| 589 | case Opt_acl: |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 590 | set_opt(opts->s_mount_opt, POSIX_ACL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | break; |
| 592 | case Opt_noacl: |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 593 | clear_opt(opts->s_mount_opt, POSIX_ACL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | break; |
| 595 | #else |
| 596 | case Opt_acl: |
| 597 | case Opt_noacl: |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 598 | ext2_msg(sb, KERN_INFO, |
| 599 | "(no)acl options not supported"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | break; |
| 601 | #endif |
Carsten Otte | 6d79125 | 2005-06-23 22:05:26 -0700 | [diff] [blame] | 602 | case Opt_xip: |
Matthew Wilcox | 9c3ce9e | 2015-02-16 15:59:31 -0800 | [diff] [blame] | 603 | ext2_msg(sb, KERN_INFO, "use dax instead of xip"); |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 604 | set_opt(opts->s_mount_opt, XIP); |
Matthew Wilcox | 9c3ce9e | 2015-02-16 15:59:31 -0800 | [diff] [blame] | 605 | /* Fall through */ |
| 606 | case Opt_dax: |
Matthew Wilcox | 6cd176a | 2015-02-16 15:59:25 -0800 | [diff] [blame] | 607 | #ifdef CONFIG_FS_DAX |
Dan Williams | ef83b6e | 2015-09-29 15:48:11 -0400 | [diff] [blame] | 608 | ext2_msg(sb, KERN_WARNING, |
| 609 | "DAX enabled. Warning: EXPERIMENTAL, use at your own risk"); |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 610 | set_opt(opts->s_mount_opt, DAX); |
Carsten Otte | 6d79125 | 2005-06-23 22:05:26 -0700 | [diff] [blame] | 611 | #else |
Matthew Wilcox | 9c3ce9e | 2015-02-16 15:59:31 -0800 | [diff] [blame] | 612 | ext2_msg(sb, KERN_INFO, "dax option not supported"); |
Carsten Otte | 6d79125 | 2005-06-23 22:05:26 -0700 | [diff] [blame] | 613 | #endif |
| 614 | break; |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 615 | |
| 616 | #if defined(CONFIG_QUOTA) |
| 617 | case Opt_quota: |
| 618 | case Opt_usrquota: |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 619 | set_opt(opts->s_mount_opt, USRQUOTA); |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 620 | break; |
| 621 | |
| 622 | case Opt_grpquota: |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 623 | set_opt(opts->s_mount_opt, GRPQUOTA); |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 624 | break; |
| 625 | #else |
| 626 | case Opt_quota: |
| 627 | case Opt_usrquota: |
| 628 | case Opt_grpquota: |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 629 | ext2_msg(sb, KERN_INFO, |
| 630 | "quota operations not supported"); |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 631 | break; |
| 632 | #endif |
| 633 | |
Martin J. Bligh | a686cd8 | 2007-10-16 23:30:46 -0700 | [diff] [blame] | 634 | case Opt_reservation: |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 635 | set_opt(opts->s_mount_opt, RESERVATION); |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 636 | ext2_msg(sb, KERN_INFO, "reservations ON"); |
Martin J. Bligh | a686cd8 | 2007-10-16 23:30:46 -0700 | [diff] [blame] | 637 | break; |
| 638 | case Opt_noreservation: |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 639 | clear_opt(opts->s_mount_opt, RESERVATION); |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 640 | ext2_msg(sb, KERN_INFO, "reservations OFF"); |
Martin J. Bligh | a686cd8 | 2007-10-16 23:30:46 -0700 | [diff] [blame] | 641 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | case Opt_ignore: |
| 643 | break; |
| 644 | default: |
| 645 | return 0; |
| 646 | } |
| 647 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | return 1; |
| 649 | } |
| 650 | |
| 651 | static int ext2_setup_super (struct super_block * sb, |
| 652 | struct ext2_super_block * es, |
| 653 | int read_only) |
| 654 | { |
| 655 | int res = 0; |
| 656 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
| 657 | |
| 658 | if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 659 | ext2_msg(sb, KERN_ERR, |
| 660 | "error: revision level too high, " |
| 661 | "forcing read-only mode"); |
Linus Torvalds | 1751e8a | 2017-11-27 13:05:09 -0800 | [diff] [blame] | 662 | res = SB_RDONLY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | } |
| 664 | if (read_only) |
| 665 | return res; |
| 666 | if (!(sbi->s_mount_state & EXT2_VALID_FS)) |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 667 | ext2_msg(sb, KERN_WARNING, |
| 668 | "warning: mounting unchecked fs, " |
| 669 | "running e2fsck is recommended"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | else if ((sbi->s_mount_state & EXT2_ERROR_FS)) |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 671 | ext2_msg(sb, KERN_WARNING, |
| 672 | "warning: mounting fs with errors, " |
| 673 | "running e2fsck is recommended"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && |
| 675 | le16_to_cpu(es->s_mnt_count) >= |
| 676 | (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 677 | ext2_msg(sb, KERN_WARNING, |
| 678 | "warning: maximal mount count reached, " |
| 679 | "running e2fsck is recommended"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | else if (le32_to_cpu(es->s_checkinterval) && |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 681 | (le32_to_cpu(es->s_lastcheck) + |
| 682 | le32_to_cpu(es->s_checkinterval) <= get_seconds())) |
| 683 | ext2_msg(sb, KERN_WARNING, |
| 684 | "warning: checktime reached, " |
| 685 | "running e2fsck is recommended"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | if (!le16_to_cpu(es->s_max_mnt_count)) |
| 687 | es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT); |
Marcin Slusarz | fba4d39 | 2008-04-28 02:15:59 -0700 | [diff] [blame] | 688 | le16_add_cpu(&es->s_mnt_count, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | if (test_opt (sb, DEBUG)) |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 690 | ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, fs=%lu, gc=%lu, " |
| 691 | "bpg=%lu, ipg=%lu, mo=%04lx]", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize, |
| 693 | sbi->s_frag_size, |
| 694 | sbi->s_groups_count, |
| 695 | EXT2_BLOCKS_PER_GROUP(sb), |
| 696 | EXT2_INODES_PER_GROUP(sb), |
| 697 | sbi->s_mount_opt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | return res; |
| 699 | } |
| 700 | |
Akinobu Mita | 197cd65a | 2008-02-06 01:40:16 -0800 | [diff] [blame] | 701 | static int ext2_check_descriptors(struct super_block *sb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | { |
| 703 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | |
| 706 | ext2_debug ("Checking group descriptors"); |
| 707 | |
Akinobu Mita | 197cd65a | 2008-02-06 01:40:16 -0800 | [diff] [blame] | 708 | for (i = 0; i < sbi->s_groups_count; i++) { |
| 709 | struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL); |
Akinobu Mita | 24097d1 | 2008-04-28 02:16:01 -0700 | [diff] [blame] | 710 | ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i); |
| 711 | ext2_fsblk_t last_block; |
Akinobu Mita | 197cd65a | 2008-02-06 01:40:16 -0800 | [diff] [blame] | 712 | |
Eric Sandeen | 41f04d8 | 2006-09-27 01:49:30 -0700 | [diff] [blame] | 713 | if (i == sbi->s_groups_count - 1) |
| 714 | last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1; |
| 715 | else |
| 716 | last_block = first_block + |
| 717 | (EXT2_BLOCKS_PER_GROUP(sb) - 1); |
| 718 | |
Eric Sandeen | 41f04d8 | 2006-09-27 01:49:30 -0700 | [diff] [blame] | 719 | if (le32_to_cpu(gdp->bg_block_bitmap) < first_block || |
| 720 | le32_to_cpu(gdp->bg_block_bitmap) > last_block) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | { |
| 722 | ext2_error (sb, "ext2_check_descriptors", |
| 723 | "Block bitmap for group %d" |
| 724 | " not in group (block %lu)!", |
| 725 | i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap)); |
| 726 | return 0; |
| 727 | } |
Eric Sandeen | 41f04d8 | 2006-09-27 01:49:30 -0700 | [diff] [blame] | 728 | if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block || |
| 729 | le32_to_cpu(gdp->bg_inode_bitmap) > last_block) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | { |
| 731 | ext2_error (sb, "ext2_check_descriptors", |
| 732 | "Inode bitmap for group %d" |
| 733 | " not in group (block %lu)!", |
| 734 | i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap)); |
| 735 | return 0; |
| 736 | } |
Eric Sandeen | 41f04d8 | 2006-09-27 01:49:30 -0700 | [diff] [blame] | 737 | if (le32_to_cpu(gdp->bg_inode_table) < first_block || |
Eric Sandeen | 780dcdb | 2007-07-26 10:41:11 -0700 | [diff] [blame] | 738 | le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 > |
Eric Sandeen | 41f04d8 | 2006-09-27 01:49:30 -0700 | [diff] [blame] | 739 | last_block) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | { |
| 741 | ext2_error (sb, "ext2_check_descriptors", |
| 742 | "Inode table for group %d" |
| 743 | " not in group (block %lu)!", |
| 744 | i, (unsigned long) le32_to_cpu(gdp->bg_inode_table)); |
| 745 | return 0; |
| 746 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | } |
| 748 | return 1; |
| 749 | } |
| 750 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | /* |
| 752 | * Maximal file size. There is a direct, and {,double-,triple-}indirect |
| 753 | * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. |
| 754 | * We need to be 1 filesystem block less than the 2^32 sector limit. |
| 755 | */ |
| 756 | static loff_t ext2_max_size(int bits) |
| 757 | { |
| 758 | loff_t res = EXT2_NDIR_BLOCKS; |
Aneesh Kumar K.V | 902be4c | 2008-01-28 23:58:26 -0500 | [diff] [blame] | 759 | int meta_blocks; |
| 760 | loff_t upper_limit; |
| 761 | |
| 762 | /* This is calculated to be the largest file size for a |
| 763 | * dense, file such that the total number of |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | * sectors in the file, including data and all indirect blocks, |
Aneesh Kumar K.V | 902be4c | 2008-01-28 23:58:26 -0500 | [diff] [blame] | 765 | * does not exceed 2^32 -1 |
| 766 | * __u32 i_blocks representing the total number of |
| 767 | * 512 bytes blocks of the file |
| 768 | */ |
| 769 | upper_limit = (1LL << 32) - 1; |
| 770 | |
| 771 | /* total blocks in file system block size */ |
| 772 | upper_limit >>= (bits - 9); |
| 773 | |
| 774 | |
| 775 | /* indirect blocks */ |
| 776 | meta_blocks = 1; |
| 777 | /* double indirect blocks */ |
| 778 | meta_blocks += 1 + (1LL << (bits-2)); |
| 779 | /* tripple indirect blocks */ |
| 780 | meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); |
| 781 | |
| 782 | upper_limit -= meta_blocks; |
| 783 | upper_limit <<= bits; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | |
| 785 | res += 1LL << (bits-2); |
| 786 | res += 1LL << (2*(bits-2)); |
| 787 | res += 1LL << (3*(bits-2)); |
| 788 | res <<= bits; |
| 789 | if (res > upper_limit) |
| 790 | res = upper_limit; |
Aneesh Kumar K.V | 902be4c | 2008-01-28 23:58:26 -0500 | [diff] [blame] | 791 | |
| 792 | if (res > MAX_LFS_FILESIZE) |
| 793 | res = MAX_LFS_FILESIZE; |
| 794 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | return res; |
| 796 | } |
| 797 | |
| 798 | static unsigned long descriptor_loc(struct super_block *sb, |
| 799 | unsigned long logic_sb_block, |
| 800 | int nr) |
| 801 | { |
| 802 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
Akinobu Mita | 24097d1 | 2008-04-28 02:16:01 -0700 | [diff] [blame] | 803 | unsigned long bg, first_meta_bg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | int has_super = 0; |
| 805 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); |
| 807 | |
| 808 | if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) || |
| 809 | nr < first_meta_bg) |
| 810 | return (logic_sb_block + nr + 1); |
| 811 | bg = sbi->s_desc_per_block * nr; |
| 812 | if (ext2_bg_has_super(sb, bg)) |
| 813 | has_super = 1; |
Akinobu Mita | 24097d1 | 2008-04-28 02:16:01 -0700 | [diff] [blame] | 814 | |
| 815 | return ext2_group_first_block_no(sb, bg) + has_super; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 816 | } |
| 817 | |
| 818 | static int ext2_fill_super(struct super_block *sb, void *data, int silent) |
| 819 | { |
Dan Williams | 8cf037a | 2017-08-30 09:43:34 -0700 | [diff] [blame] | 820 | struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | struct buffer_head * bh; |
| 822 | struct ext2_sb_info * sbi; |
| 823 | struct ext2_super_block * es; |
| 824 | struct inode *root; |
| 825 | unsigned long block; |
| 826 | unsigned long sb_block = get_sb_block(&data); |
| 827 | unsigned long logic_sb_block; |
| 828 | unsigned long offset = 0; |
| 829 | unsigned long def_mount_opts; |
Chengguang Xu | d090990 | 2018-02-26 17:45:12 +0800 | [diff] [blame] | 830 | long ret = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | int blocksize = BLOCK_SIZE; |
| 832 | int db_count; |
| 833 | int i, j; |
| 834 | __le32 features; |
Peter Zijlstra | 833f407 | 2007-10-16 23:25:45 -0700 | [diff] [blame] | 835 | int err; |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 836 | struct ext2_mount_options opts; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | |
Panagiotis Issaris | f8314dc | 2006-09-27 01:49:37 -0700 | [diff] [blame] | 838 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | if (!sbi) |
Wanlong Gao | e124a32 | 2012-06-28 00:49:44 +0800 | [diff] [blame] | 840 | goto failed; |
Pekka J Enberg | 18a82eb | 2009-01-07 18:07:19 -0800 | [diff] [blame] | 841 | |
| 842 | sbi->s_blockgroup_lock = |
| 843 | kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); |
| 844 | if (!sbi->s_blockgroup_lock) { |
| 845 | kfree(sbi); |
Wanlong Gao | e124a32 | 2012-06-28 00:49:44 +0800 | [diff] [blame] | 846 | goto failed; |
Pekka J Enberg | 18a82eb | 2009-01-07 18:07:19 -0800 | [diff] [blame] | 847 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | sb->s_fs_info = sbi; |
Miklos Szeredi | 93d44cb | 2007-10-16 23:26:26 -0700 | [diff] [blame] | 849 | sbi->s_sb_block = sb_block; |
Dan Williams | 8cf037a | 2017-08-30 09:43:34 -0700 | [diff] [blame] | 850 | sbi->s_daxdev = dax_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame] | 852 | spin_lock_init(&sbi->s_lock); |
Chengguang Xu | d090990 | 2018-02-26 17:45:12 +0800 | [diff] [blame] | 853 | ret = -EINVAL; |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame] | 854 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | /* |
| 856 | * See what the current blocksize for the device is, and |
| 857 | * use that as the blocksize. Otherwise (or if the blocksize |
| 858 | * is smaller than the default) use the default. |
| 859 | * This is important for devices that have a hardware |
| 860 | * sectorsize that is larger than the default. |
| 861 | */ |
| 862 | blocksize = sb_min_blocksize(sb, BLOCK_SIZE); |
| 863 | if (!blocksize) { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 864 | ext2_msg(sb, KERN_ERR, "error: unable to set blocksize"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | goto failed_sbi; |
| 866 | } |
| 867 | |
| 868 | /* |
| 869 | * If the superblock doesn't start on a hardware sector boundary, |
| 870 | * calculate the offset. |
| 871 | */ |
| 872 | if (blocksize != BLOCK_SIZE) { |
| 873 | logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; |
| 874 | offset = (sb_block*BLOCK_SIZE) % blocksize; |
| 875 | } else { |
| 876 | logic_sb_block = sb_block; |
| 877 | } |
| 878 | |
| 879 | if (!(bh = sb_bread(sb, logic_sb_block))) { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 880 | ext2_msg(sb, KERN_ERR, "error: unable to read superblock"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | goto failed_sbi; |
| 882 | } |
| 883 | /* |
| 884 | * Note: s_es must be initialized as soon as possible because |
| 885 | * some ext2 macro-instructions depend on its value |
| 886 | */ |
| 887 | es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); |
| 888 | sbi->s_es = es; |
| 889 | sb->s_magic = le16_to_cpu(es->s_magic); |
| 890 | |
| 891 | if (sb->s_magic != EXT2_SUPER_MAGIC) |
| 892 | goto cantfind_ext2; |
| 893 | |
| 894 | /* Set defaults before we parse the mount options */ |
| 895 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); |
| 896 | if (def_mount_opts & EXT2_DEFM_DEBUG) |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 897 | set_opt(opts.s_mount_opt, DEBUG); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | if (def_mount_opts & EXT2_DEFM_BSDGROUPS) |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 899 | set_opt(opts.s_mount_opt, GRPID); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | if (def_mount_opts & EXT2_DEFM_UID16) |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 901 | set_opt(opts.s_mount_opt, NO_UID32); |
Hugh Dickins | 2e7842b | 2007-02-10 01:46:13 -0800 | [diff] [blame] | 902 | #ifdef CONFIG_EXT2_FS_XATTR |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | if (def_mount_opts & EXT2_DEFM_XATTR_USER) |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 904 | set_opt(opts.s_mount_opt, XATTR_USER); |
Hugh Dickins | 2e7842b | 2007-02-10 01:46:13 -0800 | [diff] [blame] | 905 | #endif |
| 906 | #ifdef CONFIG_EXT2_FS_POSIX_ACL |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | if (def_mount_opts & EXT2_DEFM_ACL) |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 908 | set_opt(opts.s_mount_opt, POSIX_ACL); |
Hugh Dickins | 2e7842b | 2007-02-10 01:46:13 -0800 | [diff] [blame] | 909 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 910 | |
| 911 | if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC) |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 912 | set_opt(opts.s_mount_opt, ERRORS_PANIC); |
Aneesh Kumar K.V | 14e11e1 | 2008-02-06 01:36:17 -0800 | [diff] [blame] | 913 | else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE) |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 914 | set_opt(opts.s_mount_opt, ERRORS_CONT); |
Aneesh Kumar K.V | 14e11e1 | 2008-02-06 01:36:17 -0800 | [diff] [blame] | 915 | else |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 916 | set_opt(opts.s_mount_opt, ERRORS_RO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 918 | opts.s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid)); |
| 919 | opts.s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 921 | set_opt(opts.s_mount_opt, RESERVATION); |
Martin J. Bligh | a686cd8 | 2007-10-16 23:30:46 -0700 | [diff] [blame] | 922 | |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 923 | if (!parse_options((char *) data, sb, &opts)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | goto failed_mount; |
| 925 | |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 926 | sbi->s_mount_opt = opts.s_mount_opt; |
| 927 | sbi->s_resuid = opts.s_resuid; |
| 928 | sbi->s_resgid = opts.s_resgid; |
| 929 | |
Linus Torvalds | 1751e8a | 2017-11-27 13:05:09 -0800 | [diff] [blame] | 930 | sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? |
Linus Torvalds | 1751e8a | 2017-11-27 13:05:09 -0800 | [diff] [blame] | 932 | SB_POSIXACL : 0); |
Tejun Heo | 46b15ca | 2015-06-16 18:48:31 -0400 | [diff] [blame] | 933 | sb->s_iflags |= SB_I_CGROUPWB; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | |
| 935 | if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV && |
| 936 | (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) || |
| 937 | EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) || |
| 938 | EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U))) |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 939 | ext2_msg(sb, KERN_WARNING, |
| 940 | "warning: feature flags set on rev 0 fs, " |
| 941 | "running e2fsck is recommended"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | /* |
| 943 | * Check feature flags regardless of the revision level, since we |
| 944 | * previously didn't change the revision level when setting the flags, |
| 945 | * so there is a chance incompat flags are set on a rev 0 filesystem. |
| 946 | */ |
| 947 | features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP); |
| 948 | if (features) { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 949 | ext2_msg(sb, KERN_ERR, "error: couldn't mount because of " |
| 950 | "unsupported optional features (%x)", |
| 951 | le32_to_cpu(features)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 952 | goto failed_mount; |
| 953 | } |
David Howells | bc98a42 | 2017-07-17 08:45:34 +0100 | [diff] [blame] | 954 | if (!sb_rdonly(sb) && (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){ |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 955 | ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of " |
| 956 | "unsupported optional features (%x)", |
| 957 | le32_to_cpu(features)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | goto failed_mount; |
| 959 | } |
| 960 | |
| 961 | blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); |
| 962 | |
Matthew Wilcox | 9c3ce9e | 2015-02-16 15:59:31 -0800 | [diff] [blame] | 963 | if (sbi->s_mount_opt & EXT2_MOUNT_DAX) { |
Dave Jiang | 80660f2 | 2018-05-30 13:03:46 -0700 | [diff] [blame^] | 964 | if (!bdev_dax_supported(sb->s_bdev, blocksize)) { |
Dan Williams | b4b5798 | 2017-12-21 18:18:27 -0800 | [diff] [blame] | 965 | ext2_msg(sb, KERN_ERR, |
| 966 | "DAX unsupported by block device. Turning off DAX."); |
| 967 | sbi->s_mount_opt &= ~EXT2_MOUNT_DAX; |
| 968 | } |
Carsten Otte | 6d79125 | 2005-06-23 22:05:26 -0700 | [diff] [blame] | 969 | } |
| 970 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | /* If the blocksize doesn't match, re-read the thing.. */ |
| 972 | if (sb->s_blocksize != blocksize) { |
| 973 | brelse(bh); |
| 974 | |
| 975 | if (!sb_set_blocksize(sb, blocksize)) { |
Robin Dong | 4e299c1 | 2011-05-05 10:44:04 +0800 | [diff] [blame] | 976 | ext2_msg(sb, KERN_ERR, |
| 977 | "error: bad blocksize %d", blocksize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 978 | goto failed_sbi; |
| 979 | } |
| 980 | |
| 981 | logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; |
| 982 | offset = (sb_block*BLOCK_SIZE) % blocksize; |
| 983 | bh = sb_bread(sb, logic_sb_block); |
| 984 | if(!bh) { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 985 | ext2_msg(sb, KERN_ERR, "error: couldn't read" |
| 986 | "superblock on 2nd try"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | goto failed_sbi; |
| 988 | } |
| 989 | es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); |
| 990 | sbi->s_es = es; |
| 991 | if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 992 | ext2_msg(sb, KERN_ERR, "error: magic mismatch"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | goto failed_mount; |
| 994 | } |
| 995 | } |
| 996 | |
| 997 | sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits); |
Al Viro | 8de5277 | 2012-02-06 12:45:27 -0500 | [diff] [blame] | 998 | sb->s_max_links = EXT2_LINK_MAX; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | |
| 1000 | if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) { |
| 1001 | sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; |
| 1002 | sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; |
| 1003 | } else { |
| 1004 | sbi->s_inode_size = le16_to_cpu(es->s_inode_size); |
| 1005 | sbi->s_first_ino = le32_to_cpu(es->s_first_ino); |
| 1006 | if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) || |
vignesh babu | d8ea6cf | 2007-10-16 23:27:14 -0700 | [diff] [blame] | 1007 | !is_power_of_2(sbi->s_inode_size) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1008 | (sbi->s_inode_size > blocksize)) { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 1009 | ext2_msg(sb, KERN_ERR, |
| 1010 | "error: unsupported inode size: %d", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | sbi->s_inode_size); |
| 1012 | goto failed_mount; |
| 1013 | } |
| 1014 | } |
| 1015 | |
| 1016 | sbi->s_frag_size = EXT2_MIN_FRAG_SIZE << |
| 1017 | le32_to_cpu(es->s_log_frag_size); |
| 1018 | if (sbi->s_frag_size == 0) |
| 1019 | goto cantfind_ext2; |
| 1020 | sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size; |
| 1021 | |
| 1022 | sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); |
| 1023 | sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); |
| 1024 | sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); |
| 1025 | |
| 1026 | if (EXT2_INODE_SIZE(sb) == 0) |
| 1027 | goto cantfind_ext2; |
| 1028 | sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb); |
Andries Brouwer | 607eb26 | 2006-08-27 01:23:43 -0700 | [diff] [blame] | 1029 | if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | goto cantfind_ext2; |
| 1031 | sbi->s_itb_per_group = sbi->s_inodes_per_group / |
| 1032 | sbi->s_inodes_per_block; |
| 1033 | sbi->s_desc_per_block = sb->s_blocksize / |
| 1034 | sizeof (struct ext2_group_desc); |
| 1035 | sbi->s_sbh = bh; |
| 1036 | sbi->s_mount_state = le16_to_cpu(es->s_state); |
| 1037 | sbi->s_addr_per_block_bits = |
David Howells | f0d1b0b | 2006-12-08 02:37:49 -0800 | [diff] [blame] | 1038 | ilog2 (EXT2_ADDR_PER_BLOCK(sb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1039 | sbi->s_desc_per_block_bits = |
David Howells | f0d1b0b | 2006-12-08 02:37:49 -0800 | [diff] [blame] | 1040 | ilog2 (EXT2_DESC_PER_BLOCK(sb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1041 | |
| 1042 | if (sb->s_magic != EXT2_SUPER_MAGIC) |
| 1043 | goto cantfind_ext2; |
| 1044 | |
| 1045 | if (sb->s_blocksize != bh->b_size) { |
| 1046 | if (!silent) |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 1047 | ext2_msg(sb, KERN_ERR, "error: unsupported blocksize"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | goto failed_mount; |
| 1049 | } |
| 1050 | |
| 1051 | if (sb->s_blocksize != sbi->s_frag_size) { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 1052 | ext2_msg(sb, KERN_ERR, |
| 1053 | "error: fragsize %lu != blocksize %lu" |
| 1054 | "(not supported yet)", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1055 | sbi->s_frag_size, sb->s_blocksize); |
| 1056 | goto failed_mount; |
| 1057 | } |
| 1058 | |
| 1059 | if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 1060 | ext2_msg(sb, KERN_ERR, |
| 1061 | "error: #blocks per group too big: %lu", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1062 | sbi->s_blocks_per_group); |
| 1063 | goto failed_mount; |
| 1064 | } |
| 1065 | if (sbi->s_frags_per_group > sb->s_blocksize * 8) { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 1066 | ext2_msg(sb, KERN_ERR, |
| 1067 | "error: #fragments per group too big: %lu", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | sbi->s_frags_per_group); |
| 1069 | goto failed_mount; |
| 1070 | } |
| 1071 | if (sbi->s_inodes_per_group > sb->s_blocksize * 8) { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 1072 | ext2_msg(sb, KERN_ERR, |
| 1073 | "error: #inodes per group too big: %lu", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1074 | sbi->s_inodes_per_group); |
| 1075 | goto failed_mount; |
| 1076 | } |
| 1077 | |
| 1078 | if (EXT2_BLOCKS_PER_GROUP(sb) == 0) |
| 1079 | goto cantfind_ext2; |
Eric Sandeen | 41f04d8 | 2006-09-27 01:49:30 -0700 | [diff] [blame] | 1080 | sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - |
| 1081 | le32_to_cpu(es->s_first_data_block) - 1) |
| 1082 | / EXT2_BLOCKS_PER_GROUP(sb)) + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1083 | db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) / |
| 1084 | EXT2_DESC_PER_BLOCK(sb); |
| 1085 | sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL); |
| 1086 | if (sbi->s_group_desc == NULL) { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 1087 | ext2_msg(sb, KERN_ERR, "error: not enough memory"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1088 | goto failed_mount; |
| 1089 | } |
Pekka J Enberg | 18a82eb | 2009-01-07 18:07:19 -0800 | [diff] [blame] | 1090 | bgl_lock_init(sbi->s_blockgroup_lock); |
Yoann Padioleau | dd00cc4 | 2007-07-19 01:49:03 -0700 | [diff] [blame] | 1091 | sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | if (!sbi->s_debts) { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 1093 | ext2_msg(sb, KERN_ERR, "error: not enough memory"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1094 | goto failed_mount_group_desc; |
| 1095 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1096 | for (i = 0; i < db_count; i++) { |
| 1097 | block = descriptor_loc(sb, logic_sb_block, i); |
| 1098 | sbi->s_group_desc[i] = sb_bread(sb, block); |
| 1099 | if (!sbi->s_group_desc[i]) { |
| 1100 | for (j = 0; j < i; j++) |
| 1101 | brelse (sbi->s_group_desc[j]); |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 1102 | ext2_msg(sb, KERN_ERR, |
| 1103 | "error: unable to read group descriptors"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1104 | goto failed_mount_group_desc; |
| 1105 | } |
| 1106 | } |
| 1107 | if (!ext2_check_descriptors (sb)) { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 1108 | ext2_msg(sb, KERN_ERR, "group descriptors corrupted"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1109 | goto failed_mount2; |
| 1110 | } |
| 1111 | sbi->s_gdb_count = db_count; |
| 1112 | get_random_bytes(&sbi->s_next_generation, sizeof(u32)); |
| 1113 | spin_lock_init(&sbi->s_next_gen_lock); |
Mingming Cao | 0216bfc | 2006-06-23 02:05:41 -0700 | [diff] [blame] | 1114 | |
Martin J. Bligh | a686cd8 | 2007-10-16 23:30:46 -0700 | [diff] [blame] | 1115 | /* per fileystem reservation list head & lock */ |
| 1116 | spin_lock_init(&sbi->s_rsv_window_lock); |
| 1117 | sbi->s_rsv_window_root = RB_ROOT; |
| 1118 | /* |
| 1119 | * Add a single, static dummy reservation to the start of the |
| 1120 | * reservation window list --- it gives us a placeholder for |
| 1121 | * append-at-start-of-list which makes the allocation logic |
| 1122 | * _much_ simpler. |
| 1123 | */ |
| 1124 | sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; |
| 1125 | sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; |
| 1126 | sbi->s_rsv_window_head.rsv_alloc_hit = 0; |
| 1127 | sbi->s_rsv_window_head.rsv_goal_size = 0; |
| 1128 | ext2_rsv_window_add(sb, &sbi->s_rsv_window_head); |
| 1129 | |
Peter Zijlstra | 833f407 | 2007-10-16 23:25:45 -0700 | [diff] [blame] | 1130 | err = percpu_counter_init(&sbi->s_freeblocks_counter, |
Tejun Heo | 908c7f1 | 2014-09-08 09:51:29 +0900 | [diff] [blame] | 1131 | ext2_count_free_blocks(sb), GFP_KERNEL); |
Peter Zijlstra | 833f407 | 2007-10-16 23:25:45 -0700 | [diff] [blame] | 1132 | if (!err) { |
| 1133 | err = percpu_counter_init(&sbi->s_freeinodes_counter, |
Tejun Heo | 908c7f1 | 2014-09-08 09:51:29 +0900 | [diff] [blame] | 1134 | ext2_count_free_inodes(sb), GFP_KERNEL); |
Peter Zijlstra | 833f407 | 2007-10-16 23:25:45 -0700 | [diff] [blame] | 1135 | } |
| 1136 | if (!err) { |
| 1137 | err = percpu_counter_init(&sbi->s_dirs_counter, |
Tejun Heo | 908c7f1 | 2014-09-08 09:51:29 +0900 | [diff] [blame] | 1138 | ext2_count_dirs(sb), GFP_KERNEL); |
Peter Zijlstra | 833f407 | 2007-10-16 23:25:45 -0700 | [diff] [blame] | 1139 | } |
| 1140 | if (err) { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 1141 | ext2_msg(sb, KERN_ERR, "error: insufficient memory"); |
Peter Zijlstra | 833f407 | 2007-10-16 23:25:45 -0700 | [diff] [blame] | 1142 | goto failed_mount3; |
| 1143 | } |
Jan Kara | be0726d | 2016-02-22 11:56:38 -0500 | [diff] [blame] | 1144 | |
| 1145 | #ifdef CONFIG_EXT2_FS_XATTR |
Tahsin Erdogan | 4738740 | 2017-06-22 11:28:55 -0400 | [diff] [blame] | 1146 | sbi->s_ea_block_cache = ext2_xattr_create_cache(); |
| 1147 | if (!sbi->s_ea_block_cache) { |
| 1148 | ext2_msg(sb, KERN_ERR, "Failed to create ea_block_cache"); |
Jan Kara | be0726d | 2016-02-22 11:56:38 -0500 | [diff] [blame] | 1149 | goto failed_mount3; |
| 1150 | } |
| 1151 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1152 | /* |
| 1153 | * set up enough so that it can read an inode |
| 1154 | */ |
| 1155 | sb->s_op = &ext2_sops; |
| 1156 | sb->s_export_op = &ext2_export_ops; |
| 1157 | sb->s_xattr = ext2_xattr_handlers; |
Christoph Hellwig | 123e9ca | 2010-05-19 07:16:44 -0400 | [diff] [blame] | 1158 | |
| 1159 | #ifdef CONFIG_QUOTA |
| 1160 | sb->dq_op = &dquot_operations; |
Jan Kara | 161f3b7 | 2017-04-06 17:02:09 +0200 | [diff] [blame] | 1161 | sb->s_qcop = &ext2_quotactl_ops; |
Jan Kara | 6424111 | 2014-09-25 16:44:45 +0200 | [diff] [blame] | 1162 | sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; |
Christoph Hellwig | 123e9ca | 2010-05-19 07:16:44 -0400 | [diff] [blame] | 1163 | #endif |
| 1164 | |
David Howells | 52fcf70 | 2008-02-07 00:15:35 -0800 | [diff] [blame] | 1165 | root = ext2_iget(sb, EXT2_ROOT_INO); |
| 1166 | if (IS_ERR(root)) { |
| 1167 | ret = PTR_ERR(root); |
| 1168 | goto failed_mount3; |
| 1169 | } |
| 1170 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { |
| 1171 | iput(root); |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 1172 | ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck"); |
David Howells | 52fcf70 | 2008-02-07 00:15:35 -0800 | [diff] [blame] | 1173 | goto failed_mount3; |
| 1174 | } |
| 1175 | |
Al Viro | 48fde70 | 2012-01-08 22:15:13 -0500 | [diff] [blame] | 1176 | sb->s_root = d_make_root(root); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1177 | if (!sb->s_root) { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 1178 | ext2_msg(sb, KERN_ERR, "error: get root inode failed"); |
David Howells | 52fcf70 | 2008-02-07 00:15:35 -0800 | [diff] [blame] | 1179 | ret = -ENOMEM; |
Mingming Cao | 0216bfc | 2006-06-23 02:05:41 -0700 | [diff] [blame] | 1180 | goto failed_mount3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1181 | } |
| 1182 | if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 1183 | ext2_msg(sb, KERN_WARNING, |
| 1184 | "warning: mounting ext3 filesystem as ext2"); |
David Howells | bc98a42 | 2017-07-17 08:45:34 +0100 | [diff] [blame] | 1185 | if (ext2_setup_super (sb, es, sb_rdonly(sb))) |
Linus Torvalds | 1751e8a | 2017-11-27 13:05:09 -0800 | [diff] [blame] | 1186 | sb->s_flags |= SB_RDONLY; |
Jan Blunck | 4c96a68 | 2010-04-14 14:38:37 +0200 | [diff] [blame] | 1187 | ext2_write_super(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1188 | return 0; |
| 1189 | |
| 1190 | cantfind_ext2: |
| 1191 | if (!silent) |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 1192 | ext2_msg(sb, KERN_ERR, |
| 1193 | "error: can't find an ext2 filesystem on dev %s.", |
| 1194 | sb->s_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1195 | goto failed_mount; |
Mingming Cao | 0216bfc | 2006-06-23 02:05:41 -0700 | [diff] [blame] | 1196 | failed_mount3: |
Tahsin Erdogan | 4738740 | 2017-06-22 11:28:55 -0400 | [diff] [blame] | 1197 | if (sbi->s_ea_block_cache) |
| 1198 | ext2_xattr_destroy_cache(sbi->s_ea_block_cache); |
Mingming Cao | 0216bfc | 2006-06-23 02:05:41 -0700 | [diff] [blame] | 1199 | percpu_counter_destroy(&sbi->s_freeblocks_counter); |
| 1200 | percpu_counter_destroy(&sbi->s_freeinodes_counter); |
| 1201 | percpu_counter_destroy(&sbi->s_dirs_counter); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1202 | failed_mount2: |
| 1203 | for (i = 0; i < db_count; i++) |
| 1204 | brelse(sbi->s_group_desc[i]); |
| 1205 | failed_mount_group_desc: |
| 1206 | kfree(sbi->s_group_desc); |
| 1207 | kfree(sbi->s_debts); |
| 1208 | failed_mount: |
| 1209 | brelse(bh); |
| 1210 | failed_sbi: |
| 1211 | sb->s_fs_info = NULL; |
Manish Katiyar | 0f7ee7c | 2009-05-17 23:52:51 -0400 | [diff] [blame] | 1212 | kfree(sbi->s_blockgroup_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1213 | kfree(sbi); |
Wanlong Gao | e124a32 | 2012-06-28 00:49:44 +0800 | [diff] [blame] | 1214 | failed: |
Dan Williams | 8cf037a | 2017-08-30 09:43:34 -0700 | [diff] [blame] | 1215 | fs_put_dax(dax_dev); |
David Howells | 52fcf70 | 2008-02-07 00:15:35 -0800 | [diff] [blame] | 1216 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1217 | } |
| 1218 | |
Theodore Ts'o | 7bf0dc9 | 2009-12-15 16:46:48 -0800 | [diff] [blame] | 1219 | static void ext2_clear_super_error(struct super_block *sb) |
| 1220 | { |
| 1221 | struct buffer_head *sbh = EXT2_SB(sb)->s_sbh; |
| 1222 | |
| 1223 | if (buffer_write_io_error(sbh)) { |
| 1224 | /* |
| 1225 | * Oh, dear. A previous attempt to write the |
| 1226 | * superblock failed. This could happen because the |
| 1227 | * USB device was yanked out. Or it could happen to |
| 1228 | * be a transient write error and maybe the block will |
| 1229 | * be remapped. Nothing we can do but to retry the |
| 1230 | * write and hope for the best. |
| 1231 | */ |
Jan Blunck | 2b8120e | 2010-04-14 14:38:33 +0200 | [diff] [blame] | 1232 | ext2_msg(sb, KERN_ERR, |
Julia Lawall | f463589 | 2017-12-27 15:51:37 +0100 | [diff] [blame] | 1233 | "previous I/O error to superblock detected"); |
Theodore Ts'o | 7bf0dc9 | 2009-12-15 16:46:48 -0800 | [diff] [blame] | 1234 | clear_buffer_write_io_error(sbh); |
| 1235 | set_buffer_uptodate(sbh); |
| 1236 | } |
| 1237 | } |
| 1238 | |
Jan Kara | 6554766 | 2017-04-05 13:32:52 +0200 | [diff] [blame] | 1239 | void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es, |
| 1240 | int wait) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1241 | { |
Theodore Ts'o | 7bf0dc9 | 2009-12-15 16:46:48 -0800 | [diff] [blame] | 1242 | ext2_clear_super_error(sb); |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame] | 1243 | spin_lock(&EXT2_SB(sb)->s_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1244 | es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); |
| 1245 | es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); |
| 1246 | es->s_wtime = cpu_to_le32(get_seconds()); |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame] | 1247 | /* unlock before we do IO */ |
| 1248 | spin_unlock(&EXT2_SB(sb)->s_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1249 | mark_buffer_dirty(EXT2_SB(sb)->s_sbh); |
Jan Blunck | ee6921e | 2010-04-14 14:38:36 +0200 | [diff] [blame] | 1250 | if (wait) |
| 1251 | sync_dirty_buffer(EXT2_SB(sb)->s_sbh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1252 | } |
| 1253 | |
| 1254 | /* |
| 1255 | * In the second extended file system, it is not necessary to |
| 1256 | * write the super block since we use a mapping of the |
| 1257 | * disk super block in a buffer. |
| 1258 | * |
| 1259 | * However, this function is still used to set the fs valid |
| 1260 | * flags to 0. We need to set this flag to 0 since the fs |
| 1261 | * may have been checked while mounted and e2fsck may have |
| 1262 | * set s_state to EXT2_VALID_FS after some corrections. |
| 1263 | */ |
Christoph Hellwig | 40f31dd | 2009-06-08 10:04:17 +0200 | [diff] [blame] | 1264 | static int ext2_sync_fs(struct super_block *sb, int wait) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1265 | { |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame] | 1266 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
Christoph Hellwig | 40f31dd | 2009-06-08 10:04:17 +0200 | [diff] [blame] | 1267 | struct ext2_super_block *es = EXT2_SB(sb)->s_es; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1268 | |
Jan Kara | a117782 | 2012-07-03 16:45:29 +0200 | [diff] [blame] | 1269 | /* |
| 1270 | * Write quota structures to quota file, sync_blockdev() will write |
| 1271 | * them to disk later |
| 1272 | */ |
| 1273 | dquot_writeback_dquots(sb, -1); |
| 1274 | |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame] | 1275 | spin_lock(&sbi->s_lock); |
Christoph Hellwig | 40f31dd | 2009-06-08 10:04:17 +0200 | [diff] [blame] | 1276 | if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) { |
| 1277 | ext2_debug("setting valid to 0\n"); |
| 1278 | es->s_state &= cpu_to_le16(~EXT2_VALID_FS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1279 | } |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame] | 1280 | spin_unlock(&sbi->s_lock); |
Jan Blunck | ee6921e | 2010-04-14 14:38:36 +0200 | [diff] [blame] | 1281 | ext2_sync_super(sb, es, wait); |
Christoph Hellwig | 40f31dd | 2009-06-08 10:04:17 +0200 | [diff] [blame] | 1282 | return 0; |
| 1283 | } |
| 1284 | |
Jan Kara | 1e8b212 | 2012-06-12 16:20:46 +0200 | [diff] [blame] | 1285 | static int ext2_freeze(struct super_block *sb) |
| 1286 | { |
| 1287 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
| 1288 | |
| 1289 | /* |
| 1290 | * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared |
| 1291 | * because we have unattached inodes and thus filesystem is not fully |
| 1292 | * consistent. |
| 1293 | */ |
| 1294 | if (atomic_long_read(&sb->s_remove_count)) { |
| 1295 | ext2_sync_fs(sb, 1); |
| 1296 | return 0; |
| 1297 | } |
| 1298 | /* Set EXT2_FS_VALID flag */ |
| 1299 | spin_lock(&sbi->s_lock); |
| 1300 | sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state); |
| 1301 | spin_unlock(&sbi->s_lock); |
| 1302 | ext2_sync_super(sb, sbi->s_es, 1); |
| 1303 | |
| 1304 | return 0; |
| 1305 | } |
| 1306 | |
| 1307 | static int ext2_unfreeze(struct super_block *sb) |
| 1308 | { |
| 1309 | /* Just write sb to clear EXT2_VALID_FS flag */ |
| 1310 | ext2_write_super(sb); |
| 1311 | |
| 1312 | return 0; |
| 1313 | } |
Christoph Hellwig | 40f31dd | 2009-06-08 10:04:17 +0200 | [diff] [blame] | 1314 | |
Jan Kara | 6554766 | 2017-04-05 13:32:52 +0200 | [diff] [blame] | 1315 | static void ext2_write_super(struct super_block *sb) |
Christoph Hellwig | 40f31dd | 2009-06-08 10:04:17 +0200 | [diff] [blame] | 1316 | { |
David Howells | bc98a42 | 2017-07-17 08:45:34 +0100 | [diff] [blame] | 1317 | if (!sb_rdonly(sb)) |
Christoph Hellwig | 40f31dd | 2009-06-08 10:04:17 +0200 | [diff] [blame] | 1318 | ext2_sync_fs(sb, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1319 | } |
| 1320 | |
| 1321 | static int ext2_remount (struct super_block * sb, int * flags, char * data) |
| 1322 | { |
| 1323 | struct ext2_sb_info * sbi = EXT2_SB(sb); |
| 1324 | struct ext2_super_block * es; |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 1325 | struct ext2_mount_options new_opts; |
Jan Kara | 50a5223 | 2005-07-12 13:58:29 -0700 | [diff] [blame] | 1326 | int err; |
| 1327 | |
Theodore Ts'o | 02b9984 | 2014-03-13 10:14:33 -0400 | [diff] [blame] | 1328 | sync_filesystem(sb); |
Alessio Igor Bogani | 337eb00 | 2009-05-12 15:10:54 +0200 | [diff] [blame] | 1329 | |
Jan Kara | 8af634f | 2017-10-09 16:46:40 +0200 | [diff] [blame] | 1330 | spin_lock(&sbi->s_lock); |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 1331 | new_opts.s_mount_opt = sbi->s_mount_opt; |
| 1332 | new_opts.s_resuid = sbi->s_resuid; |
| 1333 | new_opts.s_resgid = sbi->s_resgid; |
Jan Kara | 8af634f | 2017-10-09 16:46:40 +0200 | [diff] [blame] | 1334 | spin_unlock(&sbi->s_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1335 | |
| 1336 | /* |
| 1337 | * Allow the "check" option to be passed as a remount option. |
| 1338 | */ |
Jan Kara | 8af634f | 2017-10-09 16:46:40 +0200 | [diff] [blame] | 1339 | if (!parse_options(data, sb, &new_opts)) |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 1340 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1341 | |
Jan Kara | 8af634f | 2017-10-09 16:46:40 +0200 | [diff] [blame] | 1342 | spin_lock(&sbi->s_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1343 | es = sbi->s_es; |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 1344 | if ((sbi->s_mount_opt ^ new_opts.s_mount_opt) & EXT2_MOUNT_DAX) { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 1345 | ext2_msg(sb, KERN_WARNING, "warning: refusing change of " |
Matthew Wilcox | 9c3ce9e | 2015-02-16 15:59:31 -0800 | [diff] [blame] | 1346 | "dax flag with busy inodes while remounting"); |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 1347 | new_opts.s_mount_opt ^= EXT2_MOUNT_DAX; |
Carsten Otte | 0e4a9b5 | 2009-02-11 13:04:37 -0800 | [diff] [blame] | 1348 | } |
Linus Torvalds | 1751e8a | 2017-11-27 13:05:09 -0800 | [diff] [blame] | 1349 | if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 1350 | goto out_set; |
Linus Torvalds | 1751e8a | 2017-11-27 13:05:09 -0800 | [diff] [blame] | 1351 | if (*flags & SB_RDONLY) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1352 | if (le16_to_cpu(es->s_state) & EXT2_VALID_FS || |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 1353 | !(sbi->s_mount_state & EXT2_VALID_FS)) |
| 1354 | goto out_set; |
Christoph Hellwig | c79d967 | 2010-05-19 07:16:40 -0400 | [diff] [blame] | 1355 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1356 | /* |
| 1357 | * OK, we are remounting a valid rw partition rdonly, so set |
| 1358 | * the rdonly flag and then mark the partition as valid again. |
| 1359 | */ |
| 1360 | es->s_state = cpu_to_le16(sbi->s_mount_state); |
| 1361 | es->s_mtime = cpu_to_le32(get_seconds()); |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame] | 1362 | spin_unlock(&sbi->s_lock); |
Christoph Hellwig | c79d967 | 2010-05-19 07:16:40 -0400 | [diff] [blame] | 1363 | |
Christoph Hellwig | 0f0dd62 | 2010-05-19 07:16:41 -0400 | [diff] [blame] | 1364 | err = dquot_suspend(sb, -1); |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 1365 | if (err < 0) |
| 1366 | return err; |
Christoph Hellwig | c79d967 | 2010-05-19 07:16:40 -0400 | [diff] [blame] | 1367 | |
Jan Blunck | 4c96a68 | 2010-04-14 14:38:37 +0200 | [diff] [blame] | 1368 | ext2_sync_super(sb, es, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1369 | } else { |
| 1370 | __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb, |
| 1371 | ~EXT2_FEATURE_RO_COMPAT_SUPP); |
| 1372 | if (ret) { |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 1373 | spin_unlock(&sbi->s_lock); |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 1374 | ext2_msg(sb, KERN_WARNING, |
| 1375 | "warning: couldn't remount RDWR because of " |
| 1376 | "unsupported optional features (%x).", |
| 1377 | le32_to_cpu(ret)); |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 1378 | return -EROFS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1379 | } |
| 1380 | /* |
| 1381 | * Mounting a RDONLY partition read-write, so reread and |
| 1382 | * store the current valid flag. (It may have been changed |
| 1383 | * by e2fsck since we originally mounted the partition.) |
| 1384 | */ |
| 1385 | sbi->s_mount_state = le16_to_cpu(es->s_state); |
| 1386 | if (!ext2_setup_super (sb, es, 0)) |
Linus Torvalds | 1751e8a | 2017-11-27 13:05:09 -0800 | [diff] [blame] | 1387 | sb->s_flags &= ~SB_RDONLY; |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame] | 1388 | spin_unlock(&sbi->s_lock); |
Christoph Hellwig | c79d967 | 2010-05-19 07:16:40 -0400 | [diff] [blame] | 1389 | |
Jan Blunck | 4c96a68 | 2010-04-14 14:38:37 +0200 | [diff] [blame] | 1390 | ext2_write_super(sb); |
Christoph Hellwig | c79d967 | 2010-05-19 07:16:40 -0400 | [diff] [blame] | 1391 | |
Christoph Hellwig | 0f0dd62 | 2010-05-19 07:16:41 -0400 | [diff] [blame] | 1392 | dquot_resume(sb, -1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1393 | } |
Christoph Hellwig | c79d967 | 2010-05-19 07:16:40 -0400 | [diff] [blame] | 1394 | |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 1395 | spin_lock(&sbi->s_lock); |
| 1396 | out_set: |
| 1397 | sbi->s_mount_opt = new_opts.s_mount_opt; |
| 1398 | sbi->s_resuid = new_opts.s_resuid; |
| 1399 | sbi->s_resgid = new_opts.s_resgid; |
Linus Torvalds | 1751e8a | 2017-11-27 13:05:09 -0800 | [diff] [blame] | 1400 | sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | |
| 1401 | ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? SB_POSIXACL : 0); |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame] | 1402 | spin_unlock(&sbi->s_lock); |
Jan Kara | 0885195 | 2017-10-09 16:34:58 +0200 | [diff] [blame] | 1403 | |
| 1404 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1405 | } |
| 1406 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 1407 | static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1408 | { |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 1409 | struct super_block *sb = dentry->d_sb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1410 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
Pekka Enberg | e4fca01 | 2006-12-06 20:35:27 -0800 | [diff] [blame] | 1411 | struct ext2_super_block *es = sbi->s_es; |
Pekka Enberg | e4fca01 | 2006-12-06 20:35:27 -0800 | [diff] [blame] | 1412 | u64 fsid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1413 | |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame] | 1414 | spin_lock(&sbi->s_lock); |
| 1415 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1416 | if (test_opt (sb, MINIX_DF)) |
Badari Pulavarty | 2235219 | 2007-07-15 23:41:58 -0700 | [diff] [blame] | 1417 | sbi->s_overhead_last = 0; |
| 1418 | else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) { |
| 1419 | unsigned long i, overhead = 0; |
| 1420 | smp_rmb(); |
| 1421 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1422 | /* |
Badari Pulavarty | 2235219 | 2007-07-15 23:41:58 -0700 | [diff] [blame] | 1423 | * Compute the overhead (FS structures). This is constant |
| 1424 | * for a given filesystem unless the number of block groups |
| 1425 | * changes so we cache the previous value until it does. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1426 | */ |
| 1427 | |
| 1428 | /* |
| 1429 | * All of the blocks before first_data_block are |
| 1430 | * overhead |
| 1431 | */ |
Pekka Enberg | e4fca01 | 2006-12-06 20:35:27 -0800 | [diff] [blame] | 1432 | overhead = le32_to_cpu(es->s_first_data_block); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1433 | |
| 1434 | /* |
| 1435 | * Add the overhead attributed to the superblock and |
| 1436 | * block group descriptors. If the sparse superblocks |
| 1437 | * feature is turned on, then not all groups have this. |
| 1438 | */ |
| 1439 | for (i = 0; i < sbi->s_groups_count; i++) |
| 1440 | overhead += ext2_bg_has_super(sb, i) + |
| 1441 | ext2_bg_num_gdb(sb, i); |
| 1442 | |
| 1443 | /* |
| 1444 | * Every block group has an inode bitmap, a block |
| 1445 | * bitmap, and an inode table. |
| 1446 | */ |
| 1447 | overhead += (sbi->s_groups_count * |
| 1448 | (2 + sbi->s_itb_per_group)); |
Badari Pulavarty | 2235219 | 2007-07-15 23:41:58 -0700 | [diff] [blame] | 1449 | sbi->s_overhead_last = overhead; |
| 1450 | smp_wmb(); |
| 1451 | sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1452 | } |
| 1453 | |
| 1454 | buf->f_type = EXT2_SUPER_MAGIC; |
| 1455 | buf->f_bsize = sb->s_blocksize; |
Badari Pulavarty | 2235219 | 2007-07-15 23:41:58 -0700 | [diff] [blame] | 1456 | buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1457 | buf->f_bfree = ext2_count_free_blocks(sb); |
Badari Pulavarty | 2235219 | 2007-07-15 23:41:58 -0700 | [diff] [blame] | 1458 | es->s_free_blocks_count = cpu_to_le32(buf->f_bfree); |
Pekka Enberg | e4fca01 | 2006-12-06 20:35:27 -0800 | [diff] [blame] | 1459 | buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); |
| 1460 | if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1461 | buf->f_bavail = 0; |
Pekka Enberg | e4fca01 | 2006-12-06 20:35:27 -0800 | [diff] [blame] | 1462 | buf->f_files = le32_to_cpu(es->s_inodes_count); |
| 1463 | buf->f_ffree = ext2_count_free_inodes(sb); |
Badari Pulavarty | 2235219 | 2007-07-15 23:41:58 -0700 | [diff] [blame] | 1464 | es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1465 | buf->f_namelen = EXT2_NAME_LEN; |
Pekka Enberg | e4fca01 | 2006-12-06 20:35:27 -0800 | [diff] [blame] | 1466 | fsid = le64_to_cpup((void *)es->s_uuid) ^ |
| 1467 | le64_to_cpup((void *)es->s_uuid + sizeof(u64)); |
| 1468 | buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; |
| 1469 | buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame] | 1470 | spin_unlock(&sbi->s_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1471 | return 0; |
| 1472 | } |
| 1473 | |
Al Viro | 152a083 | 2010-07-25 00:46:55 +0400 | [diff] [blame] | 1474 | static struct dentry *ext2_mount(struct file_system_type *fs_type, |
| 1475 | int flags, const char *dev_name, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1476 | { |
Al Viro | 152a083 | 2010-07-25 00:46:55 +0400 | [diff] [blame] | 1477 | return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1478 | } |
| 1479 | |
| 1480 | #ifdef CONFIG_QUOTA |
| 1481 | |
| 1482 | /* Read data from quotafile - avoid pagecache and such because we cannot afford |
| 1483 | * acquiring the locks... As quota files are never truncated and quota code |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1484 | * itself serializes the operations (and no one else should touch the files) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1485 | * we don't have to be afraid of races */ |
| 1486 | static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, |
| 1487 | size_t len, loff_t off) |
| 1488 | { |
| 1489 | struct inode *inode = sb_dqopt(sb)->files[type]; |
| 1490 | sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); |
| 1491 | int err = 0; |
| 1492 | int offset = off & (sb->s_blocksize - 1); |
| 1493 | int tocopy; |
| 1494 | size_t toread; |
| 1495 | struct buffer_head tmp_bh; |
| 1496 | struct buffer_head *bh; |
| 1497 | loff_t i_size = i_size_read(inode); |
| 1498 | |
| 1499 | if (off > i_size) |
| 1500 | return 0; |
| 1501 | if (off+len > i_size) |
| 1502 | len = i_size-off; |
| 1503 | toread = len; |
| 1504 | while (toread > 0) { |
| 1505 | tocopy = sb->s_blocksize - offset < toread ? |
| 1506 | sb->s_blocksize - offset : toread; |
| 1507 | |
| 1508 | tmp_bh.b_state = 0; |
Manish Katiyar | c16831b | 2009-02-12 21:57:04 +0100 | [diff] [blame] | 1509 | tmp_bh.b_size = sb->s_blocksize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1510 | err = ext2_get_block(inode, blk, &tmp_bh, 0); |
Martin J. Bligh | a686cd8 | 2007-10-16 23:30:46 -0700 | [diff] [blame] | 1511 | if (err < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1512 | return err; |
| 1513 | if (!buffer_mapped(&tmp_bh)) /* A hole? */ |
| 1514 | memset(data, 0, tocopy); |
| 1515 | else { |
| 1516 | bh = sb_bread(sb, tmp_bh.b_blocknr); |
| 1517 | if (!bh) |
| 1518 | return -EIO; |
| 1519 | memcpy(data, bh->b_data+offset, tocopy); |
| 1520 | brelse(bh); |
| 1521 | } |
| 1522 | offset = 0; |
| 1523 | toread -= tocopy; |
| 1524 | data += tocopy; |
| 1525 | blk++; |
| 1526 | } |
| 1527 | return len; |
| 1528 | } |
| 1529 | |
| 1530 | /* Write to quotafile */ |
| 1531 | static ssize_t ext2_quota_write(struct super_block *sb, int type, |
| 1532 | const char *data, size_t len, loff_t off) |
| 1533 | { |
| 1534 | struct inode *inode = sb_dqopt(sb)->files[type]; |
| 1535 | sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); |
| 1536 | int err = 0; |
| 1537 | int offset = off & (sb->s_blocksize - 1); |
| 1538 | int tocopy; |
| 1539 | size_t towrite = len; |
| 1540 | struct buffer_head tmp_bh; |
| 1541 | struct buffer_head *bh; |
| 1542 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1543 | while (towrite > 0) { |
| 1544 | tocopy = sb->s_blocksize - offset < towrite ? |
| 1545 | sb->s_blocksize - offset : towrite; |
| 1546 | |
| 1547 | tmp_bh.b_state = 0; |
Jan Kara | df4e7ac | 2013-12-03 11:20:06 +0100 | [diff] [blame] | 1548 | tmp_bh.b_size = sb->s_blocksize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1549 | err = ext2_get_block(inode, blk, &tmp_bh, 1); |
Martin J. Bligh | a686cd8 | 2007-10-16 23:30:46 -0700 | [diff] [blame] | 1550 | if (err < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1551 | goto out; |
| 1552 | if (offset || tocopy != EXT2_BLOCK_SIZE(sb)) |
| 1553 | bh = sb_bread(sb, tmp_bh.b_blocknr); |
| 1554 | else |
| 1555 | bh = sb_getblk(sb, tmp_bh.b_blocknr); |
Wang Shilong | 2b0542a | 2013-01-12 01:34:50 -0800 | [diff] [blame] | 1556 | if (unlikely(!bh)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1557 | err = -EIO; |
| 1558 | goto out; |
| 1559 | } |
| 1560 | lock_buffer(bh); |
| 1561 | memcpy(bh->b_data+offset, data, tocopy); |
| 1562 | flush_dcache_page(bh->b_page); |
| 1563 | set_buffer_uptodate(bh); |
| 1564 | mark_buffer_dirty(bh); |
| 1565 | unlock_buffer(bh); |
| 1566 | brelse(bh); |
| 1567 | offset = 0; |
| 1568 | towrite -= tocopy; |
| 1569 | data += tocopy; |
| 1570 | blk++; |
| 1571 | } |
| 1572 | out: |
Jan Kara | e2a3fde | 2012-04-25 21:29:42 +0200 | [diff] [blame] | 1573 | if (len == towrite) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1574 | return err; |
| 1575 | if (inode->i_size < off+len-towrite) |
| 1576 | i_size_write(inode, off+len-towrite); |
Jeff Layton | e1d747d | 2017-12-11 06:35:14 -0500 | [diff] [blame] | 1577 | inode_inc_iversion(inode); |
Deepa Dinamani | 078cd82 | 2016-09-14 07:48:04 -0700 | [diff] [blame] | 1578 | inode->i_mtime = inode->i_ctime = current_time(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1579 | mark_inode_dirty(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1580 | return len - towrite; |
| 1581 | } |
| 1582 | |
Jan Kara | 161f3b7 | 2017-04-06 17:02:09 +0200 | [diff] [blame] | 1583 | static int ext2_quota_on(struct super_block *sb, int type, int format_id, |
| 1584 | const struct path *path) |
| 1585 | { |
| 1586 | int err; |
| 1587 | struct inode *inode; |
| 1588 | |
| 1589 | err = dquot_quota_on(sb, type, format_id, path); |
| 1590 | if (err) |
| 1591 | return err; |
| 1592 | |
| 1593 | inode = d_inode(path->dentry); |
| 1594 | inode_lock(inode); |
| 1595 | EXT2_I(inode)->i_flags |= EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL; |
| 1596 | inode_set_flags(inode, S_NOATIME | S_IMMUTABLE, |
| 1597 | S_NOATIME | S_IMMUTABLE); |
| 1598 | inode_unlock(inode); |
| 1599 | mark_inode_dirty(inode); |
| 1600 | |
| 1601 | return 0; |
| 1602 | } |
| 1603 | |
| 1604 | static int ext2_quota_off(struct super_block *sb, int type) |
| 1605 | { |
| 1606 | struct inode *inode = sb_dqopt(sb)->files[type]; |
| 1607 | int err; |
| 1608 | |
| 1609 | if (!inode || !igrab(inode)) |
| 1610 | goto out; |
| 1611 | |
| 1612 | err = dquot_quota_off(sb, type); |
| 1613 | if (err) |
| 1614 | goto out_put; |
| 1615 | |
| 1616 | inode_lock(inode); |
| 1617 | EXT2_I(inode)->i_flags &= ~(EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL); |
| 1618 | inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE); |
| 1619 | inode_unlock(inode); |
| 1620 | mark_inode_dirty(inode); |
| 1621 | out_put: |
| 1622 | iput(inode); |
| 1623 | return err; |
| 1624 | out: |
| 1625 | return dquot_quota_off(sb, type); |
| 1626 | } |
| 1627 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1628 | #endif |
| 1629 | |
| 1630 | static struct file_system_type ext2_fs_type = { |
| 1631 | .owner = THIS_MODULE, |
| 1632 | .name = "ext2", |
Al Viro | 152a083 | 2010-07-25 00:46:55 +0400 | [diff] [blame] | 1633 | .mount = ext2_mount, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1634 | .kill_sb = kill_block_super, |
Tejun Heo | 46b15ca | 2015-06-16 18:48:31 -0400 | [diff] [blame] | 1635 | .fs_flags = FS_REQUIRES_DEV, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1636 | }; |
Eric W. Biederman | 7f78e03 | 2013-03-02 19:39:14 -0800 | [diff] [blame] | 1637 | MODULE_ALIAS_FS("ext2"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1638 | |
| 1639 | static int __init init_ext2_fs(void) |
| 1640 | { |
Jan Kara | be0726d | 2016-02-22 11:56:38 -0500 | [diff] [blame] | 1641 | int err; |
| 1642 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1643 | err = init_inodecache(); |
| 1644 | if (err) |
Jan Kara | be0726d | 2016-02-22 11:56:38 -0500 | [diff] [blame] | 1645 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1646 | err = register_filesystem(&ext2_fs_type); |
| 1647 | if (err) |
| 1648 | goto out; |
| 1649 | return 0; |
| 1650 | out: |
| 1651 | destroy_inodecache(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1652 | return err; |
| 1653 | } |
| 1654 | |
| 1655 | static void __exit exit_ext2_fs(void) |
| 1656 | { |
| 1657 | unregister_filesystem(&ext2_fs_type); |
| 1658 | destroy_inodecache(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1659 | } |
| 1660 | |
Paul Gortmaker | 302bf2f | 2012-01-04 15:59:47 -0500 | [diff] [blame] | 1661 | MODULE_AUTHOR("Remy Card and others"); |
| 1662 | MODULE_DESCRIPTION("Second Extended Filesystem"); |
| 1663 | MODULE_LICENSE("GPL"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1664 | module_init(init_ext2_fs) |
| 1665 | module_exit(exit_ext2_fs) |