1 files changed, 598 insertions, 0 deletions

diff --git a/fs/minix/inode.c b/fs/minix/inode.c
new file mode 100644
index 000000000000..3f18c21198d7
--- /dev/null
+++ b/fs/minix/inode.c
@@ -0,0 +1,598 @@
+/*
+ *  linux/fs/minix/inode.c
+ *
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ *
+ *  Copyright (C) 1996  Gertjan van Wingerde    (gertjan@cs.vu.nl)
+ *      Minix V2 fs support.
+ *
+ *  Modified for 680x0 by Andreas Schwab
+ */
+
+#include <linux/module.h>
+#include "minix.h"
+#include <linux/buffer_head.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/highuid.h>
+#include <linux/vfs.h>
+
+static void minix_read_inode(struct inode * inode);
+static int minix_write_inode(struct inode * inode, int wait);
+static int minix_statfs(struct super_block *sb, struct kstatfs *buf);
+static int minix_remount (struct super_block * sb, int * flags, char * data);
+
+static void minix_delete_inode(struct inode *inode)
+{
+        inode->i_size = 0;
+        minix_truncate(inode);
+        minix_free_inode(inode);
+}
+
+static void minix_put_super(struct super_block *sb)
+{
+        int i;
+        struct minix_sb_info *sbi = minix_sb(sb);
+
+        if (!(sb->s_flags & MS_RDONLY)) {
+                sbi->s_ms->s_state = sbi->s_mount_state;
+                mark_buffer_dirty(sbi->s_sbh);
+        }
+        for (i = 0; i < sbi->s_imap_blocks; i++)
+                brelse(sbi->s_imap[i]);
+        for (i = 0; i < sbi->s_zmap_blocks; i++)
+                brelse(sbi->s_zmap[i]);
+        brelse (sbi->s_sbh);
+        kfree(sbi->s_imap);
+        sb->s_fs_info = NULL;
+        kfree(sbi);
+
+        return;
+}
+
+static kmem_cache_t * minix_inode_cachep;
+
+static struct inode *minix_alloc_inode(struct super_block *sb)
+{
+        struct minix_inode_info *ei;
+        ei = (struct minix_inode_info *)kmem_cache_alloc(minix_inode_cachep, SLAB_KERNEL);
+        if (!ei)
+                return NULL;
+        return &ei->vfs_inode;
+}
+
+static void minix_destroy_inode(struct inode *inode)
+{
+        kmem_cache_free(minix_inode_cachep, minix_i(inode));
+}
+
+static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
+{
+        struct minix_inode_info *ei = (struct minix_inode_info *) foo;
+
+        if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
+            SLAB_CTOR_CONSTRUCTOR)
+                inode_init_once(&ei->vfs_inode);
+}
+ 
+static int init_inodecache(void)
+{
+        minix_inode_cachep = kmem_cache_create("minix_inode_cache",
+                                             sizeof(struct minix_inode_info),
+                                             0, SLAB_RECLAIM_ACCOUNT,
+                                             init_once, NULL);
+        if (minix_inode_cachep == NULL)
+                return -ENOMEM;
+        return 0;
+}
+
+static void destroy_inodecache(void)
+{
+        if (kmem_cache_destroy(minix_inode_cachep))
+                printk(KERN_INFO "minix_inode_cache: not all structures were freed\n");
+}
+
+static struct super_operations minix_sops = {
+        .alloc_inode    = minix_alloc_inode,
+        .destroy_inode  = minix_destroy_inode,
+        .read_inode     = minix_read_inode,
+        .write_inode    = minix_write_inode,
+        .delete_inode   = minix_delete_inode,
+        .put_super      = minix_put_super,
+        .statfs         = minix_statfs,
+        .remount_fs     = minix_remount,
+};
+
+static int minix_remount (struct super_block * sb, int * flags, char * data)
+{
+        struct minix_sb_info * sbi = minix_sb(sb);
+        struct minix_super_block * ms;
+
+        ms = sbi->s_ms;
+        if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
+                return 0;
+        if (*flags & MS_RDONLY) {
+                if (ms->s_state & MINIX_VALID_FS ||
+                    !(sbi->s_mount_state & MINIX_VALID_FS))
+                        return 0;
+                /* Mounting a rw partition read-only. */
+                ms->s_state = sbi->s_mount_state;
+                mark_buffer_dirty(sbi->s_sbh);
+        } else {
+                /* Mount a partition which is read-only, read-write. */
+                sbi->s_mount_state = ms->s_state;
+                ms->s_state &= ~MINIX_VALID_FS;
+                mark_buffer_dirty(sbi->s_sbh);
+
+                if (!(sbi->s_mount_state & MINIX_VALID_FS))
+                        printk ("MINIX-fs warning: remounting unchecked fs, "
+                                "running fsck is recommended.\n");
+                else if ((sbi->s_mount_state & MINIX_ERROR_FS))
+                        printk ("MINIX-fs warning: remounting fs with errors, "
+                                "running fsck is recommended.\n");
+        }
+        return 0;
+}
+
+static int minix_fill_super(struct super_block *s, void *data, int silent)
+{
+        struct buffer_head *bh;
+        struct buffer_head **map;
+        struct minix_super_block *ms;
+        int i, block;
+        struct inode *root_inode;
+        struct minix_sb_info *sbi;
+
+        sbi = kmalloc(sizeof(struct minix_sb_info), GFP_KERNEL);
+        if (!sbi)
+                return -ENOMEM;
+        s->s_fs_info = sbi;
+        memset(sbi, 0, sizeof(struct minix_sb_info));
+
+        /* N.B. These should be compile-time tests.
+           Unfortunately that is impossible. */
+        if (32 != sizeof (struct minix_inode))
+                panic("bad V1 i-node size");
+        if (64 != sizeof(struct minix2_inode))
+                panic("bad V2 i-node size");
+
+        if (!sb_set_blocksize(s, BLOCK_SIZE))
+                goto out_bad_hblock;
+
+        if (!(bh = sb_bread(s, 1)))
+                goto out_bad_sb;
+
+        ms = (struct minix_super_block *) bh->b_data;
+        sbi->s_ms = ms;
+        sbi->s_sbh = bh;
+        sbi->s_mount_state = ms->s_state;
+        sbi->s_ninodes = ms->s_ninodes;
+        sbi->s_nzones = ms->s_nzones;
+        sbi->s_imap_blocks = ms->s_imap_blocks;
+        sbi->s_zmap_blocks = ms->s_zmap_blocks;
+        sbi->s_firstdatazone = ms->s_firstdatazone;
+        sbi->s_log_zone_size = ms->s_log_zone_size;
+        sbi->s_max_size = ms->s_max_size;
+        s->s_magic = ms->s_magic;
+        if (s->s_magic == MINIX_SUPER_MAGIC) {
+                sbi->s_version = MINIX_V1;
+                sbi->s_dirsize = 16;
+                sbi->s_namelen = 14;
+                sbi->s_link_max = MINIX_LINK_MAX;
+        } else if (s->s_magic == MINIX_SUPER_MAGIC2) {
+                sbi->s_version = MINIX_V1;
+                sbi->s_dirsize = 32;
+                sbi->s_namelen = 30;
+                sbi->s_link_max = MINIX_LINK_MAX;
+        } else if (s->s_magic == MINIX2_SUPER_MAGIC) {
+                sbi->s_version = MINIX_V2;
+                sbi->s_nzones = ms->s_zones;
+                sbi->s_dirsize = 16;
+                sbi->s_namelen = 14;
+                sbi->s_link_max = MINIX2_LINK_MAX;
+        } else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
+                sbi->s_version = MINIX_V2;
+                sbi->s_nzones = ms->s_zones;
+                sbi->s_dirsize = 32;
+                sbi->s_namelen = 30;
+                sbi->s_link_max = MINIX2_LINK_MAX;
+        } else
+                goto out_no_fs;
+
+        /*
+         * Allocate the buffer map to keep the superblock small.
+         */
+        i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);
+        map = kmalloc(i, GFP_KERNEL);
+        if (!map)
+                goto out_no_map;
+        memset(map, 0, i);
+        sbi->s_imap = &map[0];
+        sbi->s_zmap = &map[sbi->s_imap_blocks];
+
+        block=2;
+        for (i=0 ; i < sbi->s_imap_blocks ; i++) {
+                if (!(sbi->s_imap[i]=sb_bread(s, block)))
+                        goto out_no_bitmap;
+                block++;
+        }
+        for (i=0 ; i < sbi->s_zmap_blocks ; i++) {
+                if (!(sbi->s_zmap[i]=sb_bread(s, block)))
+                        goto out_no_bitmap;
+                block++;
+        }
+
+        minix_set_bit(0,sbi->s_imap[0]->b_data);
+        minix_set_bit(0,sbi->s_zmap[0]->b_data);
+
+        /* set up enough so that it can read an inode */
+        s->s_op = &minix_sops;
+        root_inode = iget(s, MINIX_ROOT_INO);
+        if (!root_inode || is_bad_inode(root_inode))
+                goto out_no_root;
+
+        s->s_root = d_alloc_root(root_inode);
+        if (!s->s_root)
+                goto out_iput;
+
+        if (!NO_TRUNCATE)
+                s->s_root->d_op = &minix_dentry_operations;
+
+        if (!(s->s_flags & MS_RDONLY)) {
+                ms->s_state &= ~MINIX_VALID_FS;
+                mark_buffer_dirty(bh);
+        }
+        if (!(sbi->s_mount_state & MINIX_VALID_FS))
+                printk ("MINIX-fs: mounting unchecked file system, "
+                        "running fsck is recommended.\n");
+        else if (sbi->s_mount_state & MINIX_ERROR_FS)
+                printk ("MINIX-fs: mounting file system with errors, "
+                        "running fsck is recommended.\n");
+        return 0;
+
+out_iput:
+        iput(root_inode);
+        goto out_freemap;
+
+out_no_root:
+        if (!silent)
+                printk("MINIX-fs: get root inode failed\n");
+        goto out_freemap;
+
+out_no_bitmap:
+        printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
+    out_freemap:
+        for (i = 0; i < sbi->s_imap_blocks; i++)
+                brelse(sbi->s_imap[i]);
+        for (i = 0; i < sbi->s_zmap_blocks; i++)
+                brelse(sbi->s_zmap[i]);
+        kfree(sbi->s_imap);
+        goto out_release;
+
+out_no_map:
+        if (!silent)
+                printk ("MINIX-fs: can't allocate map\n");
+        goto out_release;
+
+out_no_fs:
+        if (!silent)
+                printk("VFS: Can't find a Minix or Minix V2 filesystem on device "
+                       "%s.\n", s->s_id);
+    out_release:
+        brelse(bh);
+        goto out;
+
+out_bad_hblock:
+        printk("MINIX-fs: blocksize too small for device.\n");
+        goto out;
+
+out_bad_sb:
+        printk("MINIX-fs: unable to read superblock\n");
+ out:
+        s->s_fs_info = NULL;
+        kfree(sbi);
+        return -EINVAL;
+}
+
+static int minix_statfs(struct super_block *sb, struct kstatfs *buf)
+{
+        struct minix_sb_info *sbi = minix_sb(sb);
+        buf->f_type = sb->s_magic;
+        buf->f_bsize = sb->s_blocksize;
+        buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size;
+        buf->f_bfree = minix_count_free_blocks(sbi);
+        buf->f_bavail = buf->f_bfree;
+        buf->f_files = sbi->s_ninodes;
+        buf->f_ffree = minix_count_free_inodes(sbi);
+        buf->f_namelen = sbi->s_namelen;
+        return 0;
+}
+
+static int minix_get_block(struct inode *inode, sector_t block,
+                    struct buffer_head *bh_result, int create)
+{
+        if (INODE_VERSION(inode) == MINIX_V1)
+                return V1_minix_get_block(inode, block, bh_result, create);
+        else
+                return V2_minix_get_block(inode, block, bh_result, create);
+}
+
+static int minix_writepage(struct page *page, struct writeback_control *wbc)
+{
+        return block_write_full_page(page, minix_get_block, wbc);
+}
+static int minix_readpage(struct file *file, struct page *page)
+{
+        return block_read_full_page(page,minix_get_block);
+}
+static int minix_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
+{
+        return block_prepare_write(page,from,to,minix_get_block);
+}
+static sector_t minix_bmap(struct address_space *mapping, sector_t block)
+{
+        return generic_block_bmap(mapping,block,minix_get_block);
+}
+static struct address_space_operations minix_aops = {
+        .readpage = minix_readpage,
+        .writepage = minix_writepage,
+        .sync_page = block_sync_page,
+        .prepare_write = minix_prepare_write,
+        .commit_write = generic_commit_write,
+        .bmap = minix_bmap
+};
+
+static struct inode_operations minix_symlink_inode_operations = {
+        .readlink       = generic_readlink,
+        .follow_link    = page_follow_link_light,
+        .put_link       = page_put_link,
+        .getattr        = minix_getattr,
+};
+
+void minix_set_inode(struct inode *inode, dev_t rdev)
+{
+        if (S_ISREG(inode->i_mode)) {
+                inode->i_op = &minix_file_inode_operations;
+                inode->i_fop = &minix_file_operations;
+                inode->i_mapping->a_ops = &minix_aops;
+        } else if (S_ISDIR(inode->i_mode)) {
+                inode->i_op = &minix_dir_inode_operations;
+                inode->i_fop = &minix_dir_operations;
+                inode->i_mapping->a_ops = &minix_aops;
+        } else if (S_ISLNK(inode->i_mode)) {
+                inode->i_op = &minix_symlink_inode_operations;
+                inode->i_mapping->a_ops = &minix_aops;
+        } else
+                init_special_inode(inode, inode->i_mode, rdev);
+}
+
+/*
+ * The minix V1 function to read an inode.
+ */
+static void V1_minix_read_inode(struct inode * inode)
+{
+        struct buffer_head * bh;
+        struct minix_inode * raw_inode;
+        struct minix_inode_info *minix_inode = minix_i(inode);
+        int i;
+
+        raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
+        if (!raw_inode) {
+                make_bad_inode(inode);
+                return;
+        }
+        inode->i_mode = raw_inode->i_mode;
+        inode->i_uid = (uid_t)raw_inode->i_uid;
+        inode->i_gid = (gid_t)raw_inode->i_gid;
+        inode->i_nlink = raw_inode->i_nlinks;
+        inode->i_size = raw_inode->i_size;
+        inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
+        inode->i_mtime.tv_nsec = 0;
+        inode->i_atime.tv_nsec = 0;
+        inode->i_ctime.tv_nsec = 0;
+        inode->i_blocks = inode->i_blksize = 0;
+        for (i = 0; i < 9; i++)
+                minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
+        minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
+        brelse(bh);
+}
+
+/*
+ * The minix V2 function to read an inode.
+ */
+static void V2_minix_read_inode(struct inode * inode)
+{
+        struct buffer_head * bh;
+        struct minix2_inode * raw_inode;
+        struct minix_inode_info *minix_inode = minix_i(inode);
+        int i;
+
+        raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
+        if (!raw_inode) {
+                make_bad_inode(inode);
+                return;
+        }
+        inode->i_mode = raw_inode->i_mode;
+        inode->i_uid = (uid_t)raw_inode->i_uid;
+        inode->i_gid = (gid_t)raw_inode->i_gid;
+        inode->i_nlink = raw_inode->i_nlinks;
+        inode->i_size = raw_inode->i_size;
+        inode->i_mtime.tv_sec = raw_inode->i_mtime;
+        inode->i_atime.tv_sec = raw_inode->i_atime;
+        inode->i_ctime.tv_sec = raw_inode->i_ctime;
+        inode->i_mtime.tv_nsec = 0;
+        inode->i_atime.tv_nsec = 0;
+        inode->i_ctime.tv_nsec = 0;
+        inode->i_blocks = inode->i_blksize = 0;
+        for (i = 0; i < 10; i++)
+                minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
+        minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
+        brelse(bh);
+}
+
+/*
+ * The global function to read an inode.
+ */
+static void minix_read_inode(struct inode * inode)
+{
+        if (INODE_VERSION(inode) == MINIX_V1)
+                V1_minix_read_inode(inode);
+        else
+                V2_minix_read_inode(inode);
+}
+
+/*
+ * The minix V1 function to synchronize an inode.
+ */
+static struct buffer_head * V1_minix_update_inode(struct inode * inode)
+{
+        struct buffer_head * bh;
+        struct minix_inode * raw_inode;
+        struct minix_inode_info *minix_inode = minix_i(inode);
+        int i;
+
+        raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
+        if (!raw_inode)
+                return NULL;
+        raw_inode->i_mode = inode->i_mode;
+        raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
+        raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
+        raw_inode->i_nlinks = inode->i_nlink;
+        raw_inode->i_size = inode->i_size;
+        raw_inode->i_time = inode->i_mtime.tv_sec;
+        if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
+                raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
+        else for (i = 0; i < 9; i++)
+                raw_inode->i_zone[i] = minix_inode->u.i1_data[i];
+        mark_buffer_dirty(bh);
+        return bh;
+}
+
+/*
+ * The minix V2 function to synchronize an inode.
+ */
+static struct buffer_head * V2_minix_update_inode(struct inode * inode)
+{
+        struct buffer_head * bh;
+        struct minix2_inode * raw_inode;
+        struct minix_inode_info *minix_inode = minix_i(inode);
+        int i;
+
+        raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
+        if (!raw_inode)
+                return NULL;
+        raw_inode->i_mode = inode->i_mode;
+        raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
+        raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
+        raw_inode->i_nlinks = inode->i_nlink;
+        raw_inode->i_size = inode->i_size;
+        raw_inode->i_mtime = inode->i_mtime.tv_sec;
+        raw_inode->i_atime = inode->i_atime.tv_sec;
+        raw_inode->i_ctime = inode->i_ctime.tv_sec;
+        if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
+                raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
+        else for (i = 0; i < 10; i++)
+                raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
+        mark_buffer_dirty(bh);
+        return bh;
+}
+
+static struct buffer_head *minix_update_inode(struct inode *inode)
+{
+        if (INODE_VERSION(inode) == MINIX_V1)
+                return V1_minix_update_inode(inode);
+        else
+                return V2_minix_update_inode(inode);
+}
+
+static int minix_write_inode(struct inode * inode, int wait)
+{
+        brelse(minix_update_inode(inode));
+        return 0;
+}
+
+int minix_sync_inode(struct inode * inode)
+{
+        int err = 0;
+        struct buffer_head *bh;
+
+        bh = minix_update_inode(inode);
+        if (bh && buffer_dirty(bh))
+        {
+                sync_dirty_buffer(bh);
+                if (buffer_req(bh) && !buffer_uptodate(bh))
+                {
+                        printk ("IO error syncing minix inode [%s:%08lx]\n",
+                                inode->i_sb->s_id, inode->i_ino);
+                        err = -1;
+                }
+        }
+        else if (!bh)
+                err = -1;
+        brelse (bh);
+        return err;
+}
+
+int minix_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
+{
+        generic_fillattr(dentry->d_inode, stat);
+        if (INODE_VERSION(dentry->d_inode) == MINIX_V1)
+                stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size);
+        else
+                stat->blocks = (BLOCK_SIZE / 512) * V2_minix_blocks(stat->size);
+        stat->blksize = BLOCK_SIZE;
+        return 0;
+}
+
+/*
+ * The function that is called for file truncation.
+ */
+void minix_truncate(struct inode * inode)
+{
+        if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
+                return;
+        if (INODE_VERSION(inode) == MINIX_V1)
+                V1_minix_truncate(inode);
+        else
+                V2_minix_truncate(inode);
+}
+
+static struct super_block *minix_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, minix_fill_super);
+}
+
+static struct file_system_type minix_fs_type = {
+        .owner          = THIS_MODULE,
+        .name           = "minix",
+        .get_sb         = minix_get_sb,
+        .kill_sb        = kill_block_super,
+        .fs_flags       = FS_REQUIRES_DEV,
+};
+
+static int __init init_minix_fs(void)
+{
+        int err = init_inodecache();
+        if (err)
+                goto out1;
+        err = register_filesystem(&minix_fs_type);
+        if (err)
+                goto out;
+        return 0;
+out:
+        destroy_inodecache();
+out1:
+        return err;
+}
+
+static void __exit exit_minix_fs(void)
+{
+        unregister_filesystem(&minix_fs_type);
+        destroy_inodecache();
+}
+
+module_init(init_minix_fs)
+module_exit(exit_minix_fs)
+MODULE_LICENSE("GPL");
+