Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 572 insertions, 0 deletions

diff --git a/fs/sysv/super.c b/fs/sysv/super.c
new file mode 100644
index 000000000000..59e76b51142b
--- /dev/null
+++ b/fs/sysv/super.c
@@ -0,0 +1,572 @@
+/*
+ *  linux/fs/sysv/inode.c
+ *
+ *  minix/inode.c
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ *
+ *  xenix/inode.c
+ *  Copyright (C) 1992  Doug Evans
+ *
+ *  coh/inode.c
+ *  Copyright (C) 1993  Pascal Haible, Bruno Haible
+ *
+ *  sysv/inode.c
+ *  Copyright (C) 1993  Paul B. Monday
+ *
+ *  sysv/inode.c
+ *  Copyright (C) 1993  Bruno Haible
+ *  Copyright (C) 1997, 1998  Krzysztof G. Baranowski
+ *
+ *  This file contains code for read/parsing the superblock.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/buffer_head.h>
+#include "sysv.h"
+
+/*
+ * The following functions try to recognize specific filesystems.
+ *
+ * We recognize:
+ * - Xenix FS by its magic number.
+ * - SystemV FS by its magic number.
+ * - Coherent FS by its funny fname/fpack field.
+ * - SCO AFS by s_nfree == 0xffff
+ * - V7 FS has no distinguishing features.
+ *
+ * We discriminate among SystemV4 and SystemV2 FS by the assumption that
+ * the time stamp is not < 01-01-1980.
+ */
+
+enum {
+        JAN_1_1980 = (10*365 + 2) * 24 * 60 * 60
+};
+
+static void detected_xenix(struct sysv_sb_info *sbi)
+{
+        struct buffer_head *bh1 = sbi->s_bh1;
+        struct buffer_head *bh2 = sbi->s_bh2;
+        struct xenix_super_block * sbd1;
+        struct xenix_super_block * sbd2;
+
+        if (bh1 != bh2)
+                sbd1 = sbd2 = (struct xenix_super_block *) bh1->b_data;
+        else {
+                /* block size = 512, so bh1 != bh2 */
+                sbd1 = (struct xenix_super_block *) bh1->b_data;
+                sbd2 = (struct xenix_super_block *) (bh2->b_data - 512);
+        }
+
+        sbi->s_link_max = XENIX_LINK_MAX;
+        sbi->s_fic_size = XENIX_NICINOD;
+        sbi->s_flc_size = XENIX_NICFREE;
+        sbi->s_sbd1 = (char *)sbd1;
+        sbi->s_sbd2 = (char *)sbd2;
+        sbi->s_sb_fic_count = &sbd1->s_ninode;
+        sbi->s_sb_fic_inodes = &sbd1->s_inode[0];
+        sbi->s_sb_total_free_inodes = &sbd2->s_tinode;
+        sbi->s_bcache_count = &sbd1->s_nfree;
+        sbi->s_bcache = &sbd1->s_free[0];
+        sbi->s_free_blocks = &sbd2->s_tfree;
+        sbi->s_sb_time = &sbd2->s_time;
+        sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd1->s_isize);
+        sbi->s_nzones = fs32_to_cpu(sbi, sbd1->s_fsize);
+}
+
+static void detected_sysv4(struct sysv_sb_info *sbi)
+{
+        struct sysv4_super_block * sbd;
+        struct buffer_head *bh1 = sbi->s_bh1;
+        struct buffer_head *bh2 = sbi->s_bh2;
+
+        if (bh1 == bh2)
+                sbd = (struct sysv4_super_block *) (bh1->b_data + BLOCK_SIZE/2);
+        else
+                sbd = (struct sysv4_super_block *) bh2->b_data;
+
+        sbi->s_link_max = SYSV_LINK_MAX;
+        sbi->s_fic_size = SYSV_NICINOD;
+        sbi->s_flc_size = SYSV_NICFREE;
+        sbi->s_sbd1 = (char *)sbd;
+        sbi->s_sbd2 = (char *)sbd;
+        sbi->s_sb_fic_count = &sbd->s_ninode;
+        sbi->s_sb_fic_inodes = &sbd->s_inode[0];
+        sbi->s_sb_total_free_inodes = &sbd->s_tinode;
+        sbi->s_bcache_count = &sbd->s_nfree;
+        sbi->s_bcache = &sbd->s_free[0];
+        sbi->s_free_blocks = &sbd->s_tfree;
+        sbi->s_sb_time = &sbd->s_time;
+        sbi->s_sb_state = &sbd->s_state;
+        sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd->s_isize);
+        sbi->s_nzones = fs32_to_cpu(sbi, sbd->s_fsize);
+}
+
+static void detected_sysv2(struct sysv_sb_info *sbi)
+{
+        struct sysv2_super_block *sbd;
+        struct buffer_head *bh1 = sbi->s_bh1;
+        struct buffer_head *bh2 = sbi->s_bh2;
+
+        if (bh1 == bh2)
+                sbd = (struct sysv2_super_block *) (bh1->b_data + BLOCK_SIZE/2);
+        else
+                sbd = (struct sysv2_super_block *) bh2->b_data;
+
+        sbi->s_link_max = SYSV_LINK_MAX;
+        sbi->s_fic_size = SYSV_NICINOD;
+        sbi->s_flc_size = SYSV_NICFREE;
+        sbi->s_sbd1 = (char *)sbd;
+        sbi->s_sbd2 = (char *)sbd;
+        sbi->s_sb_fic_count = &sbd->s_ninode;
+        sbi->s_sb_fic_inodes = &sbd->s_inode[0];
+        sbi->s_sb_total_free_inodes = &sbd->s_tinode;
+        sbi->s_bcache_count = &sbd->s_nfree;
+        sbi->s_bcache = &sbd->s_free[0];
+        sbi->s_free_blocks = &sbd->s_tfree;
+        sbi->s_sb_time = &sbd->s_time;
+        sbi->s_sb_state = &sbd->s_state;
+        sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd->s_isize);
+        sbi->s_nzones = fs32_to_cpu(sbi, sbd->s_fsize);
+}
+
+static void detected_coherent(struct sysv_sb_info *sbi)
+{
+        struct coh_super_block * sbd;
+        struct buffer_head *bh1 = sbi->s_bh1;
+
+        sbd = (struct coh_super_block *) bh1->b_data;
+
+        sbi->s_link_max = COH_LINK_MAX;
+        sbi->s_fic_size = COH_NICINOD;
+        sbi->s_flc_size = COH_NICFREE;
+        sbi->s_sbd1 = (char *)sbd;
+        sbi->s_sbd2 = (char *)sbd;
+        sbi->s_sb_fic_count = &sbd->s_ninode;
+        sbi->s_sb_fic_inodes = &sbd->s_inode[0];
+        sbi->s_sb_total_free_inodes = &sbd->s_tinode;
+        sbi->s_bcache_count = &sbd->s_nfree;
+        sbi->s_bcache = &sbd->s_free[0];
+        sbi->s_free_blocks = &sbd->s_tfree;
+        sbi->s_sb_time = &sbd->s_time;
+        sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd->s_isize);
+        sbi->s_nzones = fs32_to_cpu(sbi, sbd->s_fsize);
+}
+
+static void detected_v7(struct sysv_sb_info *sbi)
+{
+        struct buffer_head *bh2 = sbi->s_bh2;
+        struct v7_super_block *sbd = (struct v7_super_block *)bh2->b_data;
+
+        sbi->s_link_max = V7_LINK_MAX;
+        sbi->s_fic_size = V7_NICINOD;
+        sbi->s_flc_size = V7_NICFREE;
+        sbi->s_sbd1 = (char *)sbd;
+        sbi->s_sbd2 = (char *)sbd;
+        sbi->s_sb_fic_count = &sbd->s_ninode;
+        sbi->s_sb_fic_inodes = &sbd->s_inode[0];
+        sbi->s_sb_total_free_inodes = &sbd->s_tinode;
+        sbi->s_bcache_count = &sbd->s_nfree;
+        sbi->s_bcache = &sbd->s_free[0];
+        sbi->s_free_blocks = &sbd->s_tfree;
+        sbi->s_sb_time = &sbd->s_time;
+        sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd->s_isize);
+        sbi->s_nzones = fs32_to_cpu(sbi, sbd->s_fsize);
+}
+
+static int detect_xenix(struct sysv_sb_info *sbi, struct buffer_head *bh)
+{
+        struct xenix_super_block *sbd = (struct xenix_super_block *)bh->b_data;
+        if (*(__le32 *)&sbd->s_magic == cpu_to_le32(0x2b5544))
+                sbi->s_bytesex = BYTESEX_LE;
+        else if (*(__be32 *)&sbd->s_magic == cpu_to_be32(0x2b5544))
+                sbi->s_bytesex = BYTESEX_BE;
+        else
+                return 0;
+        switch (fs32_to_cpu(sbi, sbd->s_type)) {
+        case 1:
+                sbi->s_type = FSTYPE_XENIX;
+                return 1;
+        case 2:
+                sbi->s_type = FSTYPE_XENIX;
+                return 2;
+        default:
+                return 0;
+        }
+}
+
+static int detect_sysv(struct sysv_sb_info *sbi, struct buffer_head *bh)
+{
+        struct super_block *sb = sbi->s_sb;
+        /* All relevant fields are at the same offsets in R2 and R4 */
+        struct sysv4_super_block * sbd;
+        u32 type;
+
+        sbd = (struct sysv4_super_block *) (bh->b_data + BLOCK_SIZE/2);
+        if (*(__le32 *)&sbd->s_magic == cpu_to_le32(0xfd187e20))
+                sbi->s_bytesex = BYTESEX_LE;
+        else if (*(__be32 *)&sbd->s_magic == cpu_to_be32(0xfd187e20))
+                sbi->s_bytesex = BYTESEX_BE;
+        else
+                return 0;
+
+        type = fs32_to_cpu(sbi, sbd->s_type);
+ 
+        if (fs16_to_cpu(sbi, sbd->s_nfree) == 0xffff) {
+                sbi->s_type = FSTYPE_AFS;
+                sbi->s_forced_ro = 1;
+                if (!(sb->s_flags & MS_RDONLY)) {
+                        printk("SysV FS: SCO EAFS on %s detected, " 
+                                "forcing read-only mode.\n", 
+                                sb->s_id);
+                }
+                return type;
+        }
+ 
+        if (fs32_to_cpu(sbi, sbd->s_time) < JAN_1_1980) {
+                /* this is likely to happen on SystemV2 FS */
+                if (type > 3 || type < 1)
+                        return 0;
+                sbi->s_type = FSTYPE_SYSV2;
+                return type;
+        }
+        if ((type > 3 || type < 1) && (type > 0x30 || type < 0x10))
+                return 0;
+
+        /* On Interactive Unix (ISC) Version 4.0/3.x s_type field = 0x10,
+           0x20 or 0x30 indicates that symbolic links and the 14-character
+           filename limit is gone. Due to lack of information about this
+           feature read-only mode seems to be a reasonable approach... -KGB */
+
+        if (type >= 0x10) {
+                printk("SysV FS: can't handle long file names on %s, "
+                       "forcing read-only mode.\n", sb->s_id);
+                sbi->s_forced_ro = 1;
+        }
+
+        sbi->s_type = FSTYPE_SYSV4;
+        return type >= 0x10 ? type >> 4 : type;
+}
+
+static int detect_coherent(struct sysv_sb_info *sbi, struct buffer_head *bh)
+{
+        struct coh_super_block * sbd;
+
+        sbd = (struct coh_super_block *) (bh->b_data + BLOCK_SIZE/2);
+        if ((memcmp(sbd->s_fname,"noname",6) && memcmp(sbd->s_fname,"xxxxx ",6))
+            || (memcmp(sbd->s_fpack,"nopack",6) && memcmp(sbd->s_fpack,"xxxxx\n",6)))
+                return 0;
+        sbi->s_bytesex = BYTESEX_PDP;
+        sbi->s_type = FSTYPE_COH;
+        return 1;
+}
+
+static int detect_sysv_odd(struct sysv_sb_info *sbi, struct buffer_head *bh)
+{
+        int size = detect_sysv(sbi, bh);
+
+        return size>2 ? 0 : size;
+}
+
+static struct {
+        int block;
+        int (*test)(struct sysv_sb_info *, struct buffer_head *);
+} flavours[] = {
+        {1, detect_xenix},
+        {0, detect_sysv},
+        {0, detect_coherent},
+        {9, detect_sysv_odd},
+        {15,detect_sysv_odd},
+        {18,detect_sysv},
+};
+
+static char *flavour_names[] = {
+        [FSTYPE_XENIX]  = "Xenix",
+        [FSTYPE_SYSV4]  = "SystemV",
+        [FSTYPE_SYSV2]  = "SystemV Release 2",
+        [FSTYPE_COH]    = "Coherent",
+        [FSTYPE_V7]     = "V7",
+        [FSTYPE_AFS]    = "AFS",
+};
+
+static void (*flavour_setup[])(struct sysv_sb_info *) = {
+        [FSTYPE_XENIX]  = detected_xenix,
+        [FSTYPE_SYSV4]  = detected_sysv4,
+        [FSTYPE_SYSV2]  = detected_sysv2,
+        [FSTYPE_COH]    = detected_coherent,
+        [FSTYPE_V7]     = detected_v7,
+        [FSTYPE_AFS]    = detected_sysv4,
+};
+
+static int complete_read_super(struct super_block *sb, int silent, int size)
+{
+        struct sysv_sb_info *sbi = SYSV_SB(sb);
+        struct inode *root_inode;
+        char *found = flavour_names[sbi->s_type];
+        u_char n_bits = size+8;
+        int bsize = 1 << n_bits;
+        int bsize_4 = bsize >> 2;
+
+        sbi->s_firstinodezone = 2;
+
+        flavour_setup[sbi->s_type](sbi);
+        
+        sbi->s_truncate = 1;
+        sbi->s_ndatazones = sbi->s_nzones - sbi->s_firstdatazone;
+        sbi->s_inodes_per_block = bsize >> 6;
+        sbi->s_inodes_per_block_1 = (bsize >> 6)-1;
+        sbi->s_inodes_per_block_bits = n_bits-6;
+        sbi->s_ind_per_block = bsize_4;
+        sbi->s_ind_per_block_2 = bsize_4*bsize_4;
+        sbi->s_toobig_block = 10 + bsize_4 * (1 + bsize_4 * (1 + bsize_4));
+        sbi->s_ind_per_block_bits = n_bits-2;
+
+        sbi->s_ninodes = (sbi->s_firstdatazone - sbi->s_firstinodezone)
+                << sbi->s_inodes_per_block_bits;
+
+        if (!silent)
+                printk("VFS: Found a %s FS (block size = %ld) on device %s\n",
+                       found, sb->s_blocksize, sb->s_id);
+
+        sb->s_magic = SYSV_MAGIC_BASE + sbi->s_type;
+        /* set up enough so that it can read an inode */
+        sb->s_op = &sysv_sops;
+        root_inode = iget(sb,SYSV_ROOT_INO);
+        if (!root_inode || is_bad_inode(root_inode)) {
+                printk("SysV FS: get root inode failed\n");
+                return 0;
+        }
+        sb->s_root = d_alloc_root(root_inode);
+        if (!sb->s_root) {
+                iput(root_inode);
+                printk("SysV FS: get root dentry failed\n");
+                return 0;
+        }
+        if (sbi->s_forced_ro)
+                sb->s_flags |= MS_RDONLY;
+        if (sbi->s_truncate)
+                sb->s_root->d_op = &sysv_dentry_operations;
+        sb->s_dirt = 1;
+        return 1;
+}
+
+static int sysv_fill_super(struct super_block *sb, void *data, int silent)
+{
+        struct buffer_head *bh1, *bh = NULL;
+        struct sysv_sb_info *sbi;
+        unsigned long blocknr;
+        int size = 0, i;
+        
+        if (1024 != sizeof (struct xenix_super_block))
+                panic("Xenix FS: bad superblock size");
+        if (512 != sizeof (struct sysv4_super_block))
+                panic("SystemV FS: bad superblock size");
+        if (512 != sizeof (struct sysv2_super_block))
+                panic("SystemV FS: bad superblock size");
+        if (500 != sizeof (struct coh_super_block))
+                panic("Coherent FS: bad superblock size");
+        if (64 != sizeof (struct sysv_inode))
+                panic("sysv fs: bad inode size");
+
+        sbi = kmalloc(sizeof(struct sysv_sb_info), GFP_KERNEL);
+        if (!sbi)
+                return -ENOMEM;
+        memset(sbi, 0, sizeof(struct sysv_sb_info));
+
+        sbi->s_sb = sb;
+        sbi->s_block_base = 0;
+        sb->s_fs_info = sbi;
+        
+        sb_set_blocksize(sb, BLOCK_SIZE);
+
+        for (i = 0; i < sizeof(flavours)/sizeof(flavours[0]) && !size; i++) {
+                brelse(bh);
+                bh = sb_bread(sb, flavours[i].block);
+                if (!bh)
+                        continue;
+                size = flavours[i].test(SYSV_SB(sb), bh);
+        }
+
+        if (!size)
+                goto Eunknown;
+
+        switch (size) {
+                case 1:
+                        blocknr = bh->b_blocknr << 1;
+                        brelse(bh);
+                        sb_set_blocksize(sb, 512);
+                        bh1 = sb_bread(sb, blocknr);
+                        bh = sb_bread(sb, blocknr + 1);
+                        break;
+                case 2:
+                        bh1 = bh;
+                        break;
+                case 3:
+                        blocknr = bh->b_blocknr >> 1;
+                        brelse(bh);
+                        sb_set_blocksize(sb, 2048);
+                        bh1 = bh = sb_bread(sb, blocknr);
+                        break;
+                default:
+                        goto Ebadsize;
+        }
+
+        if (bh && bh1) {
+                sbi->s_bh1 = bh1;
+                sbi->s_bh2 = bh;
+                if (complete_read_super(sb, silent, size))
+                        return 0;
+        }
+
+        brelse(bh1);
+        brelse(bh);
+        sb_set_blocksize(sb, BLOCK_SIZE);
+        printk("oldfs: cannot read superblock\n");
+failed:
+        kfree(sbi);
+        return -EINVAL;
+
+Eunknown:
+        brelse(bh);
+        if (!silent)
+                printk("VFS: unable to find oldfs superblock on device %s\n",
+                        sb->s_id);
+        goto failed;
+Ebadsize:
+        brelse(bh);
+        if (!silent)
+                printk("VFS: oldfs: unsupported block size (%dKb)\n",
+                        1<<(size-2));
+        goto failed;
+}
+
+static int v7_fill_super(struct super_block *sb, void *data, int silent)
+{
+        struct sysv_sb_info *sbi;
+        struct buffer_head *bh, *bh2 = NULL;
+        struct v7_super_block *v7sb;
+        struct sysv_inode *v7i;
+
+        if (440 != sizeof (struct v7_super_block))
+                panic("V7 FS: bad super-block size");
+        if (64 != sizeof (struct sysv_inode))
+                panic("sysv fs: bad i-node size");
+
+        sbi = kmalloc(sizeof(struct sysv_sb_info), GFP_KERNEL);
+        if (!sbi)
+                return -ENOMEM;
+        memset(sbi, 0, sizeof(struct sysv_sb_info));
+
+        sbi->s_sb = sb;
+        sbi->s_block_base = 0;
+        sbi->s_type = FSTYPE_V7;
+        sbi->s_bytesex = BYTESEX_PDP;
+        sb->s_fs_info = sbi;
+        
+        sb_set_blocksize(sb, 512);
+
+        if ((bh = sb_bread(sb, 1)) == NULL) {
+                if (!silent)
+                        printk("VFS: unable to read V7 FS superblock on "
+                               "device %s.\n", sb->s_id);
+                goto failed;
+        }
+
+        /* plausibility check on superblock */
+        v7sb = (struct v7_super_block *) bh->b_data;
+        if (fs16_to_cpu(sbi, v7sb->s_nfree) > V7_NICFREE ||
+            fs16_to_cpu(sbi, v7sb->s_ninode) > V7_NICINOD ||
+            fs32_to_cpu(sbi, v7sb->s_time) == 0)
+                goto failed;
+
+        /* plausibility check on root inode: it is a directory,
+           with a nonzero size that is a multiple of 16 */
+        if ((bh2 = sb_bread(sb, 2)) == NULL)
+                goto failed;
+        v7i = (struct sysv_inode *)(bh2->b_data + 64);
+        if ((fs16_to_cpu(sbi, v7i->i_mode) & ~0777) != S_IFDIR ||
+            (fs32_to_cpu(sbi, v7i->i_size) == 0) ||
+            (fs32_to_cpu(sbi, v7i->i_size) & 017) != 0)
+                goto failed;
+        brelse(bh2);
+        bh2 = NULL;
+
+        sbi->s_bh1 = bh;
+        sbi->s_bh2 = bh;
+        if (complete_read_super(sb, silent, 1))
+                return 0;
+
+failed:
+        brelse(bh2);
+        brelse(bh);
+        kfree(sbi);
+        return -EINVAL;
+}
+
+/* Every kernel module contains stuff like this. */
+
+static struct super_block *sysv_get_sb(struct file_system_type *fs_type,
+        int flags, const char *dev_name, void *data)
+{
+        return get_sb_bdev(fs_type, flags, dev_name, data, sysv_fill_super);
+}
+
+static struct super_block *v7_get_sb(struct file_system_type *fs_type,
+        int flags, const char *dev_name, void *data)
+{
+        return get_sb_bdev(fs_type, flags, dev_name, data, v7_fill_super);
+}
+
+static struct file_system_type sysv_fs_type = {
+        .owner          = THIS_MODULE,
+        .name           = "sysv",
+        .get_sb         = sysv_get_sb,
+        .kill_sb        = kill_block_super,
+        .fs_flags       = FS_REQUIRES_DEV,
+};
+
+static struct file_system_type v7_fs_type = {
+        .owner          = THIS_MODULE,
+        .name           = "v7",
+        .get_sb         = v7_get_sb,
+        .kill_sb        = kill_block_super,
+        .fs_flags       = FS_REQUIRES_DEV,
+};
+
+extern int sysv_init_icache(void) __init;
+extern void sysv_destroy_icache(void);
+
+static int __init init_sysv_fs(void)
+{
+        int error;
+
+        error = sysv_init_icache();
+        if (error)
+                goto out;
+        error = register_filesystem(&sysv_fs_type);
+        if (error)
+                goto destroy_icache;
+        error = register_filesystem(&v7_fs_type);
+        if (error)
+                goto unregister;
+        return 0;
+
+unregister:
+        unregister_filesystem(&sysv_fs_type);
+destroy_icache:
+        sysv_destroy_icache();
+out:
+        return error;
+}
+
+static void __exit exit_sysv_fs(void)
+{
+        unregister_filesystem(&sysv_fs_type);
+        unregister_filesystem(&v7_fs_type);
+        sysv_destroy_icache();
+}
+
+module_init(init_sysv_fs)
+module_exit(exit_sysv_fs)
+MODULE_LICENSE("GPL");