Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * fs/bfs/inode.c |
| 3 | * BFS superblock and inode operations. |
Tigran Aivazian | 6968826 | 2006-12-13 00:35:14 -0800 | [diff] [blame] | 4 | * Copyright (C) 1999-2006 Tigran Aivazian <tigran@aivazian.fsnet.co.uk> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * From fs/minix, Copyright (C) 1991, 1992 Linus Torvalds. |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 6 | * |
| 7 | * Made endianness-clean by Andrew Stribblehill <ads@wompom.org>, 2005. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | */ |
| 9 | |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/mm.h> |
| 12 | #include <linux/slab.h> |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/fs.h> |
| 15 | #include <linux/smp_lock.h> |
| 16 | #include <linux/buffer_head.h> |
| 17 | #include <linux/vfs.h> |
| 18 | #include <asm/uaccess.h> |
| 19 | #include "bfs.h" |
| 20 | |
Tigran Aivazian | 6968826 | 2006-12-13 00:35:14 -0800 | [diff] [blame] | 21 | MODULE_AUTHOR("Tigran Aivazian <tigran@aivazian.fsnet.co.uk>"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | MODULE_DESCRIPTION("SCO UnixWare BFS filesystem for Linux"); |
| 23 | MODULE_LICENSE("GPL"); |
| 24 | |
| 25 | #undef DEBUG |
| 26 | |
| 27 | #ifdef DEBUG |
| 28 | #define dprintf(x...) printf(x) |
| 29 | #else |
| 30 | #define dprintf(x...) |
| 31 | #endif |
| 32 | |
Christoph Hellwig | 8c85e12 | 2009-04-28 18:00:26 +0200 | [diff] [blame] | 33 | static void bfs_write_super(struct super_block *s); |
Dmitri Vorobiev | f433dc5 | 2007-11-14 16:59:47 -0800 | [diff] [blame] | 34 | void dump_imap(const char *prefix, struct super_block *s); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
David Howells | e33ab08 | 2008-02-07 00:15:32 -0800 | [diff] [blame] | 36 | struct inode *bfs_iget(struct super_block *sb, unsigned long ino) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | { |
Dmitri Vorobiev | f433dc5 | 2007-11-14 16:59:47 -0800 | [diff] [blame] | 38 | struct bfs_inode *di; |
David Howells | e33ab08 | 2008-02-07 00:15:32 -0800 | [diff] [blame] | 39 | struct inode *inode; |
Dmitri Vorobiev | f433dc5 | 2007-11-14 16:59:47 -0800 | [diff] [blame] | 40 | struct buffer_head *bh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | int block, off; |
| 42 | |
David Howells | e33ab08 | 2008-02-07 00:15:32 -0800 | [diff] [blame] | 43 | inode = iget_locked(sb, ino); |
| 44 | if (IS_ERR(inode)) |
| 45 | return ERR_PTR(-ENOMEM); |
| 46 | if (!(inode->i_state & I_NEW)) |
| 47 | return inode; |
| 48 | |
Dmitri Vorobiev | f433dc5 | 2007-11-14 16:59:47 -0800 | [diff] [blame] | 49 | if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(inode->i_sb)->si_lasti)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | printf("Bad inode number %s:%08lx\n", inode->i_sb->s_id, ino); |
David Howells | e33ab08 | 2008-02-07 00:15:32 -0800 | [diff] [blame] | 51 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | } |
| 53 | |
Dmitri Vorobiev | f433dc5 | 2007-11-14 16:59:47 -0800 | [diff] [blame] | 54 | block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | bh = sb_bread(inode->i_sb, block); |
| 56 | if (!bh) { |
Dmitri Vorobiev | f433dc5 | 2007-11-14 16:59:47 -0800 | [diff] [blame] | 57 | printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id, |
| 58 | ino); |
David Howells | e33ab08 | 2008-02-07 00:15:32 -0800 | [diff] [blame] | 59 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | } |
| 61 | |
| 62 | off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; |
| 63 | di = (struct bfs_inode *)bh->b_data + off; |
| 64 | |
Dmitri Vorobiev | f433dc5 | 2007-11-14 16:59:47 -0800 | [diff] [blame] | 65 | inode->i_mode = 0x0000FFFF & le32_to_cpu(di->i_mode); |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 66 | if (le32_to_cpu(di->i_vtype) == BFS_VDIR) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | inode->i_mode |= S_IFDIR; |
| 68 | inode->i_op = &bfs_dir_inops; |
| 69 | inode->i_fop = &bfs_dir_operations; |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 70 | } else if (le32_to_cpu(di->i_vtype) == BFS_VREG) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | inode->i_mode |= S_IFREG; |
| 72 | inode->i_op = &bfs_file_inops; |
| 73 | inode->i_fop = &bfs_file_operations; |
| 74 | inode->i_mapping->a_ops = &bfs_aops; |
| 75 | } |
| 76 | |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 77 | BFS_I(inode)->i_sblock = le32_to_cpu(di->i_sblock); |
| 78 | BFS_I(inode)->i_eblock = le32_to_cpu(di->i_eblock); |
Dmitri Vorobiev | f433dc5 | 2007-11-14 16:59:47 -0800 | [diff] [blame] | 79 | BFS_I(inode)->i_dsk_ino = le16_to_cpu(di->i_ino); |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 80 | inode->i_uid = le32_to_cpu(di->i_uid); |
| 81 | inode->i_gid = le32_to_cpu(di->i_gid); |
| 82 | inode->i_nlink = le32_to_cpu(di->i_nlink); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | inode->i_size = BFS_FILESIZE(di); |
| 84 | inode->i_blocks = BFS_FILEBLOCKS(di); |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 85 | inode->i_atime.tv_sec = le32_to_cpu(di->i_atime); |
| 86 | inode->i_mtime.tv_sec = le32_to_cpu(di->i_mtime); |
| 87 | inode->i_ctime.tv_sec = le32_to_cpu(di->i_ctime); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | inode->i_atime.tv_nsec = 0; |
| 89 | inode->i_mtime.tv_nsec = 0; |
| 90 | inode->i_ctime.tv_nsec = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | |
| 92 | brelse(bh); |
David Howells | e33ab08 | 2008-02-07 00:15:32 -0800 | [diff] [blame] | 93 | unlock_new_inode(inode); |
| 94 | return inode; |
| 95 | |
| 96 | error: |
| 97 | iget_failed(inode); |
| 98 | return ERR_PTR(-EIO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | } |
| 100 | |
Dmitri Vorobiev | f433dc5 | 2007-11-14 16:59:47 -0800 | [diff] [blame] | 101 | static int bfs_write_inode(struct inode *inode, int unused) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | { |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 103 | unsigned int ino = (u16)inode->i_ino; |
| 104 | unsigned long i_sblock; |
Dmitri Vorobiev | f433dc5 | 2007-11-14 16:59:47 -0800 | [diff] [blame] | 105 | struct bfs_inode *di; |
| 106 | struct buffer_head *bh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | int block, off; |
Dmitri Vorobiev | 3f165e4 | 2008-07-25 19:44:54 -0700 | [diff] [blame] | 108 | struct bfs_sb_info *info = BFS_SB(inode->i_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 110 | dprintf("ino=%08x\n", ino); |
| 111 | |
Dmitri Vorobiev | f433dc5 | 2007-11-14 16:59:47 -0800 | [diff] [blame] | 112 | if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(inode->i_sb)->si_lasti)) { |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 113 | printf("Bad inode number %s:%08x\n", inode->i_sb->s_id, ino); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | return -EIO; |
| 115 | } |
| 116 | |
Dmitri Vorobiev | 3f165e4 | 2008-07-25 19:44:54 -0700 | [diff] [blame] | 117 | mutex_lock(&info->bfs_lock); |
Dmitri Vorobiev | f433dc5 | 2007-11-14 16:59:47 -0800 | [diff] [blame] | 118 | block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | bh = sb_bread(inode->i_sb, block); |
| 120 | if (!bh) { |
Dmitri Vorobiev | f433dc5 | 2007-11-14 16:59:47 -0800 | [diff] [blame] | 121 | printf("Unable to read inode %s:%08x\n", |
| 122 | inode->i_sb->s_id, ino); |
Dmitri Vorobiev | 3f165e4 | 2008-07-25 19:44:54 -0700 | [diff] [blame] | 123 | mutex_unlock(&info->bfs_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | return -EIO; |
| 125 | } |
| 126 | |
Dmitri Vorobiev | f433dc5 | 2007-11-14 16:59:47 -0800 | [diff] [blame] | 127 | off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | di = (struct bfs_inode *)bh->b_data + off; |
| 129 | |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 130 | if (ino == BFS_ROOT_INO) |
| 131 | di->i_vtype = cpu_to_le32(BFS_VDIR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | else |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 133 | di->i_vtype = cpu_to_le32(BFS_VREG); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 135 | di->i_ino = cpu_to_le16(ino); |
| 136 | di->i_mode = cpu_to_le32(inode->i_mode); |
| 137 | di->i_uid = cpu_to_le32(inode->i_uid); |
| 138 | di->i_gid = cpu_to_le32(inode->i_gid); |
| 139 | di->i_nlink = cpu_to_le32(inode->i_nlink); |
| 140 | di->i_atime = cpu_to_le32(inode->i_atime.tv_sec); |
| 141 | di->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec); |
| 142 | di->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec); |
| 143 | i_sblock = BFS_I(inode)->i_sblock; |
| 144 | di->i_sblock = cpu_to_le32(i_sblock); |
| 145 | di->i_eblock = cpu_to_le32(BFS_I(inode)->i_eblock); |
| 146 | di->i_eoffset = cpu_to_le32(i_sblock * BFS_BSIZE + inode->i_size - 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | |
| 148 | mark_buffer_dirty(bh); |
| 149 | brelse(bh); |
Dmitri Vorobiev | 3f165e4 | 2008-07-25 19:44:54 -0700 | [diff] [blame] | 150 | mutex_unlock(&info->bfs_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | return 0; |
| 152 | } |
| 153 | |
Dmitri Vorobiev | f433dc5 | 2007-11-14 16:59:47 -0800 | [diff] [blame] | 154 | static void bfs_delete_inode(struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | { |
| 156 | unsigned long ino = inode->i_ino; |
Dmitri Vorobiev | f433dc5 | 2007-11-14 16:59:47 -0800 | [diff] [blame] | 157 | struct bfs_inode *di; |
| 158 | struct buffer_head *bh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | int block, off; |
Dmitri Vorobiev | f433dc5 | 2007-11-14 16:59:47 -0800 | [diff] [blame] | 160 | struct super_block *s = inode->i_sb; |
| 161 | struct bfs_sb_info *info = BFS_SB(s); |
| 162 | struct bfs_inode_info *bi = BFS_I(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 164 | dprintf("ino=%08lx\n", ino); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | |
Mark Fasheh | fef2665 | 2005-09-09 13:01:31 -0700 | [diff] [blame] | 166 | truncate_inode_pages(&inode->i_data, 0); |
| 167 | |
Dmitri Vorobiev | f433dc5 | 2007-11-14 16:59:47 -0800 | [diff] [blame] | 168 | if ((ino < BFS_ROOT_INO) || (ino > info->si_lasti)) { |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 169 | printf("invalid ino=%08lx\n", ino); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | return; |
| 171 | } |
| 172 | |
| 173 | inode->i_size = 0; |
| 174 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC; |
Dmitri Vorobiev | 3f165e4 | 2008-07-25 19:44:54 -0700 | [diff] [blame] | 175 | mutex_lock(&info->bfs_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | mark_inode_dirty(inode); |
Dmitri Vorobiev | f433dc5 | 2007-11-14 16:59:47 -0800 | [diff] [blame] | 177 | |
| 178 | block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | bh = sb_bread(s, block); |
| 180 | if (!bh) { |
Dmitri Vorobiev | f433dc5 | 2007-11-14 16:59:47 -0800 | [diff] [blame] | 181 | printf("Unable to read inode %s:%08lx\n", |
| 182 | inode->i_sb->s_id, ino); |
Dmitri Vorobiev | 3f165e4 | 2008-07-25 19:44:54 -0700 | [diff] [blame] | 183 | mutex_unlock(&info->bfs_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | return; |
| 185 | } |
Dmitri Vorobiev | f433dc5 | 2007-11-14 16:59:47 -0800 | [diff] [blame] | 186 | off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; |
| 187 | di = (struct bfs_inode *)bh->b_data + off; |
| 188 | memset((void *)di, 0, sizeof(struct bfs_inode)); |
| 189 | mark_buffer_dirty(bh); |
| 190 | brelse(bh); |
| 191 | |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 192 | if (bi->i_dsk_ino) { |
Al Viro | 7e46aa5 | 2007-12-05 08:32:52 +0000 | [diff] [blame] | 193 | if (bi->i_sblock) |
| 194 | info->si_freeb += bi->i_eblock + 1 - bi->i_sblock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | info->si_freei++; |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 196 | clear_bit(ino, info->si_imap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | dump_imap("delete_inode", s); |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 198 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | |
Dmitri Vorobiev | f433dc5 | 2007-11-14 16:59:47 -0800 | [diff] [blame] | 200 | /* |
| 201 | * If this was the last file, make the previous block |
| 202 | * "last block of the last file" even if there is no |
| 203 | * real file there, saves us 1 gap. |
| 204 | */ |
| 205 | if (info->si_lf_eblk == bi->i_eblock) { |
| 206 | info->si_lf_eblk = bi->i_sblock - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | mark_buffer_dirty(info->si_sbh); |
| 208 | } |
Dmitri Vorobiev | 3f165e4 | 2008-07-25 19:44:54 -0700 | [diff] [blame] | 209 | mutex_unlock(&info->bfs_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | clear_inode(inode); |
| 211 | } |
| 212 | |
| 213 | static void bfs_put_super(struct super_block *s) |
| 214 | { |
| 215 | struct bfs_sb_info *info = BFS_SB(s); |
Dmitri Vorobiev | 3f165e4 | 2008-07-25 19:44:54 -0700 | [diff] [blame] | 216 | |
Eric Sesterhenn | e1f89ec | 2009-01-06 14:43:12 -0800 | [diff] [blame] | 217 | if (!info) |
| 218 | return; |
| 219 | |
Christoph Hellwig | 8c85e12 | 2009-04-28 18:00:26 +0200 | [diff] [blame] | 220 | if (s->s_dirt) |
| 221 | bfs_write_super(s); |
| 222 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | brelse(info->si_sbh); |
Dmitri Vorobiev | 3f165e4 | 2008-07-25 19:44:54 -0700 | [diff] [blame] | 224 | mutex_destroy(&info->bfs_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | kfree(info->si_imap); |
| 226 | kfree(info); |
| 227 | s->s_fs_info = NULL; |
| 228 | } |
| 229 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 230 | static int bfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | { |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 232 | struct super_block *s = dentry->d_sb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | struct bfs_sb_info *info = BFS_SB(s); |
| 234 | u64 id = huge_encode_dev(s->s_bdev->bd_dev); |
| 235 | buf->f_type = BFS_MAGIC; |
| 236 | buf->f_bsize = s->s_blocksize; |
| 237 | buf->f_blocks = info->si_blocks; |
| 238 | buf->f_bfree = buf->f_bavail = info->si_freeb; |
| 239 | buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO; |
| 240 | buf->f_ffree = info->si_freei; |
| 241 | buf->f_fsid.val[0] = (u32)id; |
| 242 | buf->f_fsid.val[1] = (u32)(id >> 32); |
| 243 | buf->f_namelen = BFS_NAMELEN; |
| 244 | return 0; |
| 245 | } |
| 246 | |
| 247 | static void bfs_write_super(struct super_block *s) |
| 248 | { |
Dmitri Vorobiev | 3f165e4 | 2008-07-25 19:44:54 -0700 | [diff] [blame] | 249 | struct bfs_sb_info *info = BFS_SB(s); |
| 250 | |
| 251 | mutex_lock(&info->bfs_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | if (!(s->s_flags & MS_RDONLY)) |
Dmitri Vorobiev | 3f165e4 | 2008-07-25 19:44:54 -0700 | [diff] [blame] | 253 | mark_buffer_dirty(info->si_sbh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | s->s_dirt = 0; |
Dmitri Vorobiev | 3f165e4 | 2008-07-25 19:44:54 -0700 | [diff] [blame] | 255 | mutex_unlock(&info->bfs_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | } |
| 257 | |
Dmitri Vorobiev | f433dc5 | 2007-11-14 16:59:47 -0800 | [diff] [blame] | 258 | static struct kmem_cache *bfs_inode_cachep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | |
| 260 | static struct inode *bfs_alloc_inode(struct super_block *sb) |
| 261 | { |
| 262 | struct bfs_inode_info *bi; |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 263 | bi = kmem_cache_alloc(bfs_inode_cachep, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | if (!bi) |
| 265 | return NULL; |
| 266 | return &bi->vfs_inode; |
| 267 | } |
| 268 | |
| 269 | static void bfs_destroy_inode(struct inode *inode) |
| 270 | { |
| 271 | kmem_cache_free(bfs_inode_cachep, BFS_I(inode)); |
| 272 | } |
| 273 | |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 274 | static void init_once(void *foo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | { |
| 276 | struct bfs_inode_info *bi = foo; |
| 277 | |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 278 | inode_init_once(&bi->vfs_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | } |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 280 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | static int init_inodecache(void) |
| 282 | { |
| 283 | bfs_inode_cachep = kmem_cache_create("bfs_inode_cache", |
| 284 | sizeof(struct bfs_inode_info), |
Paul Jackson | fffb60f | 2006-03-24 03:16:06 -0800 | [diff] [blame] | 285 | 0, (SLAB_RECLAIM_ACCOUNT| |
| 286 | SLAB_MEM_SPREAD), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 287 | init_once); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | if (bfs_inode_cachep == NULL) |
| 289 | return -ENOMEM; |
| 290 | return 0; |
| 291 | } |
| 292 | |
| 293 | static void destroy_inodecache(void) |
| 294 | { |
Alexey Dobriyan | 1a1d92c | 2006-09-27 01:49:40 -0700 | [diff] [blame] | 295 | kmem_cache_destroy(bfs_inode_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | } |
| 297 | |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 298 | static const struct super_operations bfs_sops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | .alloc_inode = bfs_alloc_inode, |
| 300 | .destroy_inode = bfs_destroy_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | .write_inode = bfs_write_inode, |
| 302 | .delete_inode = bfs_delete_inode, |
| 303 | .put_super = bfs_put_super, |
| 304 | .write_super = bfs_write_super, |
| 305 | .statfs = bfs_statfs, |
| 306 | }; |
| 307 | |
Dmitri Vorobiev | f433dc5 | 2007-11-14 16:59:47 -0800 | [diff] [blame] | 308 | void dump_imap(const char *prefix, struct super_block *s) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | { |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 310 | #ifdef DEBUG |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | int i; |
| 312 | char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL); |
| 313 | |
| 314 | if (!tmpbuf) |
| 315 | return; |
Dmitri Vorobiev | f433dc5 | 2007-11-14 16:59:47 -0800 | [diff] [blame] | 316 | for (i = BFS_SB(s)->si_lasti; i >= 0; i--) { |
| 317 | if (i > PAGE_SIZE - 100) break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | if (test_bit(i, BFS_SB(s)->si_imap)) |
| 319 | strcat(tmpbuf, "1"); |
| 320 | else |
| 321 | strcat(tmpbuf, "0"); |
| 322 | } |
Dmitri Vorobiev | f433dc5 | 2007-11-14 16:59:47 -0800 | [diff] [blame] | 323 | printf("BFS-fs: %s: lasti=%08lx <%s>\n", |
| 324 | prefix, BFS_SB(s)->si_lasti, tmpbuf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | free_page((unsigned long)tmpbuf); |
| 326 | #endif |
| 327 | } |
| 328 | |
| 329 | static int bfs_fill_super(struct super_block *s, void *data, int silent) |
| 330 | { |
Dmitri Vorobiev | f433dc5 | 2007-11-14 16:59:47 -0800 | [diff] [blame] | 331 | struct buffer_head *bh; |
| 332 | struct bfs_super_block *bfs_sb; |
| 333 | struct inode *inode; |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 334 | unsigned i, imap_len; |
Dmitri Vorobiev | f433dc5 | 2007-11-14 16:59:47 -0800 | [diff] [blame] | 335 | struct bfs_sb_info *info; |
David Howells | e33ab08 | 2008-02-07 00:15:32 -0800 | [diff] [blame] | 336 | long ret = -EINVAL; |
Eric Sesterhenn | e1f89ec | 2009-01-06 14:43:12 -0800 | [diff] [blame] | 337 | unsigned long i_sblock, i_eblock, i_eoff, s_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | |
Panagiotis Issaris | f8314dc | 2006-09-27 01:49:37 -0700 | [diff] [blame] | 339 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | if (!info) |
| 341 | return -ENOMEM; |
| 342 | s->s_fs_info = info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | |
| 344 | sb_set_blocksize(s, BFS_BSIZE); |
| 345 | |
| 346 | bh = sb_bread(s, 0); |
| 347 | if(!bh) |
| 348 | goto out; |
| 349 | bfs_sb = (struct bfs_super_block *)bh->b_data; |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 350 | if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | if (!silent) |
| 352 | printf("No BFS filesystem on %s (magic=%08x)\n", |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 353 | s->s_id, le32_to_cpu(bfs_sb->s_magic)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | goto out; |
| 355 | } |
| 356 | if (BFS_UNCLEAN(bfs_sb, s) && !silent) |
| 357 | printf("%s is unclean, continuing\n", s->s_id); |
| 358 | |
| 359 | s->s_magic = BFS_MAGIC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | info->si_sbh = bh; |
Eric Sesterhenn | e1f89ec | 2009-01-06 14:43:12 -0800 | [diff] [blame] | 361 | |
| 362 | if (le32_to_cpu(bfs_sb->s_start) > le32_to_cpu(bfs_sb->s_end)) { |
| 363 | printf("Superblock is corrupted\n"); |
| 364 | goto out; |
| 365 | } |
| 366 | |
Dmitri Vorobiev | f433dc5 | 2007-11-14 16:59:47 -0800 | [diff] [blame] | 367 | info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE) / |
| 368 | sizeof(struct bfs_inode) |
| 369 | + BFS_ROOT_INO - 1; |
| 370 | imap_len = (info->si_lasti / 8) + 1; |
Panagiotis Issaris | f8314dc | 2006-09-27 01:49:37 -0700 | [diff] [blame] | 371 | info->si_imap = kzalloc(imap_len, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | if (!info->si_imap) |
| 373 | goto out; |
Dmitri Vorobiev | f433dc5 | 2007-11-14 16:59:47 -0800 | [diff] [blame] | 374 | for (i = 0; i < BFS_ROOT_INO; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | set_bit(i, info->si_imap); |
| 376 | |
| 377 | s->s_op = &bfs_sops; |
David Howells | e33ab08 | 2008-02-07 00:15:32 -0800 | [diff] [blame] | 378 | inode = bfs_iget(s, BFS_ROOT_INO); |
| 379 | if (IS_ERR(inode)) { |
| 380 | ret = PTR_ERR(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | kfree(info->si_imap); |
| 382 | goto out; |
| 383 | } |
| 384 | s->s_root = d_alloc_root(inode); |
| 385 | if (!s->s_root) { |
| 386 | iput(inode); |
David Howells | e33ab08 | 2008-02-07 00:15:32 -0800 | [diff] [blame] | 387 | ret = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | kfree(info->si_imap); |
| 389 | goto out; |
| 390 | } |
| 391 | |
Dmitri Vorobiev | f433dc5 | 2007-11-14 16:59:47 -0800 | [diff] [blame] | 392 | info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS; |
| 393 | info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1 |
| 394 | - le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | info->si_freei = 0; |
| 396 | info->si_lf_eblk = 0; |
Eric Sesterhenn | 50682bb | 2009-01-06 14:43:13 -0800 | [diff] [blame] | 397 | |
| 398 | /* can we read the last block? */ |
| 399 | bh = sb_bread(s, info->si_blocks - 1); |
| 400 | if (!bh) { |
| 401 | printf("Last block not available: %lu\n", info->si_blocks - 1); |
| 402 | iput(inode); |
| 403 | ret = -EIO; |
| 404 | kfree(info->si_imap); |
| 405 | goto out; |
| 406 | } |
| 407 | brelse(bh); |
| 408 | |
Al Viro | c2b513d | 2005-10-04 17:48:44 +0100 | [diff] [blame] | 409 | bh = NULL; |
Dmitri Vorobiev | f433dc5 | 2007-11-14 16:59:47 -0800 | [diff] [blame] | 410 | for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) { |
Al Viro | c2b513d | 2005-10-04 17:48:44 +0100 | [diff] [blame] | 411 | struct bfs_inode *di; |
Dmitri Vorobiev | f433dc5 | 2007-11-14 16:59:47 -0800 | [diff] [blame] | 412 | int block = (i - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1; |
Al Viro | c2b513d | 2005-10-04 17:48:44 +0100 | [diff] [blame] | 413 | int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; |
Dmitri Vorobiev | 75b25b4 | 2008-07-25 19:44:52 -0700 | [diff] [blame] | 414 | unsigned long eblock; |
Al Viro | c2b513d | 2005-10-04 17:48:44 +0100 | [diff] [blame] | 415 | |
| 416 | if (!off) { |
| 417 | brelse(bh); |
| 418 | bh = sb_bread(s, block); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | } |
Al Viro | c2b513d | 2005-10-04 17:48:44 +0100 | [diff] [blame] | 420 | |
| 421 | if (!bh) |
| 422 | continue; |
| 423 | |
| 424 | di = (struct bfs_inode *)bh->b_data + off; |
| 425 | |
Eric Sesterhenn | e1f89ec | 2009-01-06 14:43:12 -0800 | [diff] [blame] | 426 | /* test if filesystem is not corrupted */ |
| 427 | |
| 428 | i_eoff = le32_to_cpu(di->i_eoffset); |
| 429 | i_sblock = le32_to_cpu(di->i_sblock); |
| 430 | i_eblock = le32_to_cpu(di->i_eblock); |
| 431 | s_size = le32_to_cpu(bfs_sb->s_end); |
| 432 | |
| 433 | if (i_sblock > info->si_blocks || |
| 434 | i_eblock > info->si_blocks || |
| 435 | i_sblock > i_eblock || |
| 436 | i_eoff > s_size || |
| 437 | i_sblock * BFS_BSIZE > i_eoff) { |
| 438 | |
| 439 | printf("Inode 0x%08x corrupted\n", i); |
| 440 | |
| 441 | brelse(bh); |
| 442 | s->s_root = NULL; |
| 443 | kfree(info->si_imap); |
| 444 | kfree(info); |
| 445 | s->s_fs_info = NULL; |
| 446 | return -EIO; |
| 447 | } |
| 448 | |
Al Viro | c2b513d | 2005-10-04 17:48:44 +0100 | [diff] [blame] | 449 | if (!di->i_ino) { |
| 450 | info->si_freei++; |
| 451 | continue; |
| 452 | } |
| 453 | set_bit(i, info->si_imap); |
| 454 | info->si_freeb -= BFS_FILEBLOCKS(di); |
| 455 | |
Al Viro | c2b513d | 2005-10-04 17:48:44 +0100 | [diff] [blame] | 456 | eblock = le32_to_cpu(di->i_eblock); |
Dmitri Vorobiev | f433dc5 | 2007-11-14 16:59:47 -0800 | [diff] [blame] | 457 | if (eblock > info->si_lf_eblk) |
Al Viro | c2b513d | 2005-10-04 17:48:44 +0100 | [diff] [blame] | 458 | info->si_lf_eblk = eblock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | } |
Al Viro | c2b513d | 2005-10-04 17:48:44 +0100 | [diff] [blame] | 460 | brelse(bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | if (!(s->s_flags & MS_RDONLY)) { |
Al Viro | c2b513d | 2005-10-04 17:48:44 +0100 | [diff] [blame] | 462 | mark_buffer_dirty(info->si_sbh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | s->s_dirt = 1; |
| 464 | } |
| 465 | dump_imap("read_super", s); |
Dmitri Vorobiev | 3f165e4 | 2008-07-25 19:44:54 -0700 | [diff] [blame] | 466 | mutex_init(&info->bfs_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | return 0; |
| 468 | |
| 469 | out: |
| 470 | brelse(bh); |
| 471 | kfree(info); |
| 472 | s->s_fs_info = NULL; |
David Howells | e33ab08 | 2008-02-07 00:15:32 -0800 | [diff] [blame] | 473 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | } |
| 475 | |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 476 | static int bfs_get_sb(struct file_system_type *fs_type, |
| 477 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | { |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 479 | return get_sb_bdev(fs_type, flags, dev_name, data, bfs_fill_super, mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | } |
| 481 | |
| 482 | static struct file_system_type bfs_fs_type = { |
| 483 | .owner = THIS_MODULE, |
| 484 | .name = "bfs", |
| 485 | .get_sb = bfs_get_sb, |
| 486 | .kill_sb = kill_block_super, |
| 487 | .fs_flags = FS_REQUIRES_DEV, |
| 488 | }; |
| 489 | |
| 490 | static int __init init_bfs_fs(void) |
| 491 | { |
| 492 | int err = init_inodecache(); |
| 493 | if (err) |
| 494 | goto out1; |
| 495 | err = register_filesystem(&bfs_fs_type); |
| 496 | if (err) |
| 497 | goto out; |
| 498 | return 0; |
| 499 | out: |
| 500 | destroy_inodecache(); |
| 501 | out1: |
| 502 | return err; |
| 503 | } |
| 504 | |
| 505 | static void __exit exit_bfs_fs(void) |
| 506 | { |
| 507 | unregister_filesystem(&bfs_fs_type); |
| 508 | destroy_inodecache(); |
| 509 | } |
| 510 | |
| 511 | module_init(init_bfs_fs) |
| 512 | module_exit(exit_bfs_fs) |