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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [fs/] [befs/] [linuxvfs.c] - Blame information for rev 1765

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/*
 * linux/fs/befs/linuxvfs.c
 *
 * Copyright (C) 2001 Will Dyson <will_dyson@pobox.com
 *
 */
 
#include <linux/blkdev.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/stat.h>
#include <linux/string.h>
#include <linux/nls.h>
 
#include "befs.h"
#include "btree.h"
#include "inode.h"
#include "datastream.h"
#include "super.h"
#include "io.h"
#include "endian.h"
 
EXPORT_NO_SYMBOLS;
MODULE_DESCRIPTION("BeOS File System (BeFS) driver");
MODULE_AUTHOR("Will Dyson");
MODULE_LICENSE("GPL");
 
/* The units the vfs expects inode->i_blocks to be in */
#define VFS_BLOCK_SIZE 512
 
static int befs_readdir(struct file *, void *, filldir_t);
static int befs_get_block(struct inode *, long, struct buffer_head *, int);
static int befs_readpage(struct file *file, struct page *page);
static int befs_bmap(struct address_space *mapping, long block);
static struct dentry *befs_lookup(struct inode *, struct dentry *);
static void befs_read_inode(struct inode *ino);
static void befs_clear_inode(struct inode *ino);
static int befs_init_inodecache(void);
static void befs_destroy_inodecache(void);
 
static int befs_readlink(struct dentry *, char *, int);
static int befs_follow_link(struct dentry *, struct nameidata *nd);
 
static int befs_utf2nls(struct super_block *sb, const char *in, int in_len,
                        char **out, int *out_len);
static int befs_nls2utf(struct super_block *sb, const char *in, int in_len,
                        char **out, int *out_len);
 
static void befs_put_super(struct super_block *);
static struct super_block *befs_read_super(struct super_block *, void *, int);
static int befs_remount(struct super_block *, int *, char *);
static int befs_statfs(struct super_block *, struct statfs *);
static int parse_options(char *, befs_mount_options *);
 
static ssize_t befs_listxattr(struct dentry *dentry, char *buffer, size_t size);
static ssize_t befs_getxattr(struct dentry *dentry, const char *name,
                             void *buffer, size_t size);
static int befs_setxattr(struct dentry *dentry, const char *name, void *value,
                         size_t size, int flags);
static int befs_removexattr(struct dentry *dentry, const char *name);
 
/* slab cache for befs_inode_info objects */
static kmem_cache_t *befs_inode_cachep;
 
static const struct super_operations befs_sops = {
        read_inode:befs_read_inode,     /* initialize & read inode */
        clear_inode:befs_clear_inode,   /* uninit inode */
        put_super:befs_put_super,       /* uninit super */
        statfs:befs_statfs,     /* statfs */
        remount_fs:befs_remount,
};
 
struct file_operations befs_dir_operations = {
        read:generic_read_dir,
        readdir:befs_readdir,
};
 
struct inode_operations befs_dir_inode_operations = {
        lookup:befs_lookup,
};
 
struct file_operations befs_file_operations = {
        llseek:default_llseek,
        read:generic_file_read,
        mmap:generic_file_mmap,
};
 
struct inode_operations befs_file_inode_operations = {
};
 
struct address_space_operations befs_aops = {
        readpage:befs_readpage,
        sync_page:block_sync_page,
        bmap:befs_bmap,
};
 
static struct inode_operations befs_symlink_inode_operations = {
        readlink:befs_readlink,
        follow_link:befs_follow_link,
};
 
/*
 * Called by generic_file_read() to read a page of data
 *
 * In turn, simply calls a generic block read function and
 * passes it the address of befs_get_block, for mapping file
 * positions to disk blocks.
 */
static int
befs_readpage(struct file *file, struct page *page)
{
        return block_read_full_page(page, befs_get_block);
}
 
static int
befs_bmap(struct address_space *mapping, long block)
{
        return generic_block_bmap(mapping, block, befs_get_block);
}
 
/*
 * Generic function to map a file position (block) to a
 * disk offset (passed back in bh_result).
 *
 * Used by many higher level functions.
 *
 * Calls befs_fblock2brun() in datastream.c to do the real work.
 *
 * -WD 10-26-01
 */
 
static int
befs_get_block(struct inode *inode, long block,
               struct buffer_head *bh_result, int create)
{
        struct super_block *sb = inode->i_sb;
        befs_data_stream *ds = &BEFS_I(inode)->i_data.ds;
        befs_block_run run = BAD_IADDR;
        int res = 0;
        ulong disk_off;
 
        befs_debug(sb, "---> befs_get_block() for inode %lu, block %ld",
                   inode->i_ino, block);
 
        if (block < 0) {
                befs_error(sb, "befs_get_block() was asked for a block "
                           "number less than zero: block %ld in inode %lu",
                           block, inode->i_ino);
                return -EIO;
        }
 
        if (create) {
                befs_error(sb, "befs_get_block() was asked to write to "
                           "block %ld in inode %lu", block, inode->i_ino);
                return -EPERM;
        }
 
        res = befs_fblock2brun(sb, ds, block, &run);
        if (res != BEFS_OK) {
                befs_error(sb,
                           "<--- befs_get_block() for inode %lu, block "
                           "%ld ERROR", inode->i_ino, block);
                return -EFBIG;
        }
 
        disk_off = (ulong) iaddr2blockno(sb, &run);
 
        bh_result->b_dev = inode->i_dev;
        bh_result->b_blocknr = disk_off;
        bh_result->b_state |= (1UL << BH_Mapped);
 
        befs_debug(sb, "<--- befs_get_block() for inode %lu, block %ld, "
                   "disk address %lu", inode->i_ino, block, disk_off);
 
        return 0;
}
 
static struct dentry *
befs_lookup(struct inode *dir, struct dentry *dentry)
{
        struct inode *inode = NULL;
        struct super_block *sb = dir->i_sb;
        befs_data_stream *ds = &BEFS_I(dir)->i_data.ds;
        befs_off_t offset;
        int ret;
        int utfnamelen;
        char *utfname;
        const char *name = dentry->d_name.name;
 
        befs_debug(sb, "---> befs_lookup() "
                   "name %s inode %ld", dentry->d_name.name, dir->i_ino);
 
        /* Convert to UTF-8 */
        if (BEFS_SB(sb)->nls) {
                ret =
                    befs_nls2utf(sb, name, strlen(name), &utfname, &utfnamelen);
                if (ret < 0) {
                        befs_debug(sb, "<--- befs_lookup() ERROR");
                        return ERR_PTR(ret);
                }
                ret = befs_btree_find(sb, ds, utfname, &offset);
                kfree(utfname);
 
        } else {
                ret = befs_btree_find(sb, ds, dentry->d_name.name, &offset);
        }
 
        if (ret == BEFS_BT_NOT_FOUND) {
                befs_debug(sb, "<--- befs_lookup() %s not found",
                           dentry->d_name.name);
                return ERR_PTR(-ENOENT);
 
        } else if (ret != BEFS_OK || offset == 0) {
                befs_warning(sb, "<--- befs_lookup() Error");
                return ERR_PTR(-ENODATA);
        }
 
        inode = iget(dir->i_sb, (ino_t) offset);
        if (!inode)
                return ERR_PTR(-EACCES);
 
        d_add(dentry, inode);
 
        befs_debug(sb, "<--- befs_lookup()");
 
        return NULL;
}
 
static int
befs_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
        struct inode *inode = filp->f_dentry->d_inode;
        struct super_block *sb = inode->i_sb;
        befs_data_stream *ds = &BEFS_I(inode)->i_data.ds;
        befs_off_t value;
        int result;
        size_t keysize;
        unsigned char d_type;
        char keybuf[BEFS_NAME_LEN + 1];
        char *nlsname;
        int nlsnamelen;
        const char *dirname = filp->f_dentry->d_name.name;
 
        befs_debug(sb, "---> befs_readdir() "
                   "name %s, inode %ld, filp->f_pos %Ld",
                   dirname, inode->i_ino, filp->f_pos);
 
        result = befs_btree_read(sb, ds, filp->f_pos, BEFS_NAME_LEN + 1,
                                 keybuf, &keysize, &value);
 
        if (result == BEFS_ERR) {
                befs_debug(sb, "<--- befs_readdir() ERROR");
                befs_error(sb, "IO error reading %s (inode %lu)",
                           dirname, inode->i_ino);
                return -EIO;
 
        } else if (result == BEFS_BT_END) {
                befs_debug(sb, "<--- befs_readdir() END");
                return 0;
 
        } else if (result == BEFS_BT_EMPTY) {
                befs_debug(sb, "<--- befs_readdir() Empty directory");
                return 0;
        }
 
        d_type = DT_UNKNOWN;
 
        /* Convert to NLS */
        if (BEFS_SB(sb)->nls) {
                result =
                    befs_utf2nls(sb, keybuf, keysize, &nlsname, &nlsnamelen);
                if (result < 0) {
                        befs_debug(sb, "<--- befs_readdir() ERROR");
                        return result;
                }
                result = filldir(dirent, nlsname, nlsnamelen, filp->f_pos,
                                 (ino_t) value, d_type);
                kfree(nlsname);
 
        } else {
                result = filldir(dirent, keybuf, keysize, filp->f_pos,
                                 (ino_t) value, d_type);
        }
 
        filp->f_pos++;
 
        befs_debug(sb, "<--- befs_readdir() filp->f_pos %Ld", filp->f_pos);
 
        return 0;
}
 
static void
befs_clear_inode(struct inode *inode)
{
        befs_inode_info *b_ino = BEFS_I(inode);
        inode->u.generic_ip = NULL;
 
        if (b_ino) {
                kmem_cache_free(befs_inode_cachep, b_ino);
        }
        return;
}
 
static void
befs_read_inode(struct inode *inode)
{
        struct buffer_head *bh = NULL;
        befs_inode *raw_inode = NULL;
 
        struct super_block *sb = inode->i_sb;
        befs_sb_info *befs_sb = BEFS_SB(sb);
        befs_inode_info *befs_ino = NULL;
 
        befs_debug(sb, "---> befs_read_inode() " "inode = %lu", inode->i_ino);
 
        inode->u.generic_ip = kmem_cache_alloc(befs_inode_cachep, GFP_NOFS);
        if (inode->u.generic_ip == NULL) {
                befs_error(sb, "Unable to allocate memory for private "
                           "portion of inode %lu.", inode->i_ino);
                goto unaquire_none;
        }
        befs_ino = BEFS_I(inode);
 
        /* convert from vfs's inode number to befs's inode number */
        befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino);
 
        befs_debug(sb, "  real inode number [%u, %hu, %hu]",
                   befs_ino->i_inode_num.allocation_group,
                   befs_ino->i_inode_num.start, befs_ino->i_inode_num.len);
 
        bh = befs_bread_iaddr(sb, befs_ino->i_inode_num);
        if (!bh) {
                befs_error(sb, "unable to read inode block - "
                           "inode = %lu", inode->i_ino);
                goto unaquire_ino_info;
        }
 
        raw_inode = (befs_inode *) bh->b_data;
 
        befs_dump_inode(sb, raw_inode);
 
        if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) {
                befs_error(sb, "Bad inode: %lu", inode->i_ino);
                goto unaquire_bh;
        }
 
        inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode);
 
        /*
         * set uid and gid.  But since current BeOS is single user OS, so
         * you can change by "uid" or "gid" options.
         */
 
        inode->i_uid = befs_sb->mount_opts.use_uid ?
            befs_sb->mount_opts.uid : (uid_t) fs32_to_cpu(sb, raw_inode->uid);
        inode->i_gid = befs_sb->mount_opts.use_gid ?
            befs_sb->mount_opts.gid : (gid_t) fs32_to_cpu(sb, raw_inode->gid);
 
        inode->i_nlink = 1;
 
        /*
         * BEFS's time is 64 bits, but current VFS is 32 bits...
         * BEFS don't have access time. Nor inode change time. VFS
         * doesn't have creation time.
         */
 
        inode->i_mtime =
            (time_t) (fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16);
        inode->i_ctime = inode->i_mtime;
        inode->i_atime = inode->i_mtime;
        inode->i_blkbits = befs_sb->block_shift;
        inode->i_blksize = befs_sb->block_size;
 
        befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num);
        befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent);
        befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes);
        befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags);
 
        if (S_ISLNK(inode->i_mode) && !(inode->i_flags & BEFS_LONG_SYMLINK)) {
                inode->i_size = 0;
                inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE;
                strncpy(befs_ino->i_data.symlink, raw_inode->data.symlink,
                        BEFS_SYMLINK_LEN);
        } else {
                int num_blks;
 
                befs_ino->i_data.ds =
                    fsds_to_cpu(sb, raw_inode->data.datastream);
 
                num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds);
                inode->i_blocks =
                    num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE);
                inode->i_size = befs_ino->i_data.ds.size;
        }
 
        inode->i_mapping->a_ops = &befs_aops;
 
        if (S_ISREG(inode->i_mode)) {
                inode->i_fop = &befs_file_operations;
                inode->i_op = &befs_file_inode_operations;
        } else if (S_ISDIR(inode->i_mode)) {
                inode->i_op = &befs_dir_inode_operations;
                inode->i_fop = &befs_dir_operations;
        } else if (S_ISLNK(inode->i_mode)) {
                inode->i_op = &befs_symlink_inode_operations;
        } else {
                befs_error(sb, "Inode %lu is not a regular file, "
                           "directory or symlink. THAT IS WRONG! BeFS has no "
                           "on disk special files", inode->i_ino);
                goto unaquire_bh;
        }
 
        brelse(bh);
        befs_debug(sb, "<--- befs_read_inode()");
        return;
 
      unaquire_bh:
        brelse(bh);
 
      unaquire_ino_info:
        kmem_cache_free(befs_inode_cachep, inode->u.generic_ip);
 
      unaquire_none:
        make_bad_inode(inode);
        inode->u.generic_ip = NULL;
        befs_debug(sb, "<--- befs_read_inode() - Bad inode");
        return;
}
 
/* Initialize the inode cache. Called at fs setup.
 *
 * Taken from NFS implementation by Al Viro.
 */
static int
befs_init_inodecache(void)
{
        befs_inode_cachep = kmem_cache_create("befs_inode_cache",
                                              sizeof (struct befs_inode_info),
                                              0, SLAB_HWCACHE_ALIGN,
                                              NULL, NULL);
        if (befs_inode_cachep == NULL) {
                printk(KERN_ERR "befs_init_inodecache: "
                       "Couldn't initalize inode slabcache\n");
                return -ENOMEM;
        }
 
        return 0;
}
 
/* Called at fs teardown.
 *
 * Taken from NFS implementation by Al Viro.
 */
static void
befs_destroy_inodecache(void)
{
        if (kmem_cache_destroy(befs_inode_cachep))
                printk(KERN_ERR "befs_destroy_inodecache: "
                       "not all structures were freed\n");
}
 
/*
 * The inode of symbolic link is different to data stream.
 * The data stream become link name. Unless the LONG_SYMLINK
 * flag is set.
 */
static int
befs_follow_link(struct dentry *dentry, struct nameidata *nd)
{
        struct super_block *sb = dentry->d_sb;
        befs_inode_info *befs_ino = BEFS_I(dentry->d_inode);
        char *link;
        int res;
 
        if (befs_ino->i_flags & BEFS_LONG_SYMLINK) {
                befs_data_stream *data = &befs_ino->i_data.ds;
                befs_off_t linklen = data->size;
 
                befs_debug(sb, "Follow long symlink");
 
                link = kmalloc(linklen, GFP_NOFS);
                if (link == NULL)
                        return -ENOMEM;
 
                if (befs_read_lsymlink(sb, data, link, linklen) != linklen) {
                        kfree(link);
                        befs_error(sb, "Failed to read entire long symlink");
                        return -EIO;
                }
 
                res = vfs_follow_link(nd, link);
 
                kfree(link);
        } else {
                link = befs_ino->i_data.symlink;
                res = vfs_follow_link(nd, link);
        }
 
        return res;
}
 
static int
befs_readlink(struct dentry *dentry, char *buffer, int buflen)
{
        struct super_block *sb = dentry->d_sb;
        befs_inode_info *befs_ino = BEFS_I(dentry->d_inode);
        char *link;
        int res;
 
        if (befs_ino->i_flags & BEFS_LONG_SYMLINK) {
                befs_data_stream *data = &befs_ino->i_data.ds;
                befs_off_t linklen = data->size;
 
                befs_debug(sb, "Read long symlink");
 
                link = kmalloc(linklen, GFP_NOFS);
                if (link == NULL)
                        return -ENOMEM;
 
                if (befs_read_lsymlink(sb, data, link, linklen) != linklen) {
                        kfree(link);
                        befs_error(sb, "Failed to read entire long symlink");
                        return -EIO;
                }
 
                res = vfs_readlink(dentry, buffer, buflen, link);
 
                kfree(link);
        } else {
                link = befs_ino->i_data.symlink;
                res = vfs_readlink(dentry, buffer, buflen, link);
        }
 
        return res;
}
 
/*
 * UTF-8 to NLS charset  convert routine
 *
 * Changed 8/10/01 by Will Dyson. Now use uni2char() / char2uni() rather than
 * the nls tables directly
 */
 
static int
befs_utf2nls(struct super_block *sb, const char *in,
             int in_len, char **out, int *out_len)
{
        struct nls_table *nls = BEFS_SB(sb)->nls;
        int i, o;
        wchar_t uni;
        int unilen, utflen;
        char *result;
        int maxlen = in_len;    /* The utf8->nls conversion cant make more chars */
 
        befs_debug(sb, "---> utf2nls()");
 
        if (!nls) {
                befs_error(sb, "befs_utf2nls called with no NLS table loaded");
                return -EINVAL;
        }
 
        *out = result = kmalloc(maxlen, GFP_NOFS);
        if (!*out) {
                befs_error(sb, "befs_utf2nls() cannot allocate memory");
                *out_len = 0;
                return -ENOMEM;
        }
 
        for (i = o = 0; i < in_len; i += utflen, o += unilen) {
 
                /* convert from UTF-8 to Unicode */
                utflen = utf8_mbtowc(&uni, &in[i], in_len - i);
                if (utflen < 0) {
                        goto conv_err;
                }
 
                /* convert from Unicode to nls */
                unilen = nls->uni2char(uni, &result[o], 1);
                if (unilen < 0) {
                        goto conv_err;
                }
        }
        result[o] = '\0';
 
        befs_debug(sb, "<--- utf2nls()");
 
        return o;
        *out_len = o;
 
      conv_err:
        befs_error(sb, "Name using charecter set %s contains a charecter that "
                   "cannot be converted to unicode.", nls->charset);
        befs_debug(sb, "<--- utf2nls()");
        kfree(result);
        return -EILSEQ;
}
 
/**
 * befs_nls2utf - Convert NLS string to utf8 encodeing
 * @sb: Superblock
 * @src: Input string buffer in NLS format
 * @srclen: Length of input string in bytes
 * @dest: The output string in UTF8 format
 * @destlen: Length of the output buffer
 *
 * Converts input string @src, which is in the format of the loaded NLS map,
 * into a utf8 string.
 *
 * The destination string @dest is allocated by this function and the caller is
 * responsible for freeing it with kfree()
 *
 * On return, *@destlen is the length of @dest in bytes.
 *
 * On success, the return value is the number of utf8 charecters written to
 * the ouput buffer @dest.
 *
 * On Failure, a negative number coresponding to the error code is returned.
 */
 
static int
befs_nls2utf(struct super_block *sb, const char *in,
             int in_len, char **out, int *out_len)
{
        struct nls_table *nls = BEFS_SB(sb)->nls;
        int i, o;
        wchar_t uni;
        int unilen, utflen;
        char *result;
        int maxlen = 3 * in_len;
 
        befs_debug(sb, "---> nls2utf()\n");
 
        if (!nls) {
                befs_error(sb, "befs_nls2utf called with no NLS table loaded.");
                return -EINVAL;
        }
 
        *out = result = kmalloc(maxlen, GFP_NOFS);
        if (!*out) {
                befs_error(sb, "befs_nls2utf() cannot allocate memory");
                *out_len = 0;
                return -ENOMEM;
        }
 
        for (i = o = 0; i < in_len; i += unilen, o += utflen) {
 
                /* convert from nls to unicode */
                unilen = nls->char2uni(&in[i], in_len - i, &uni);
                if (unilen < 0) {
                        goto conv_err;
                }
 
                /* convert from unicode to UTF-8 */
                utflen = utf8_wctomb(&result[o], uni, 3);
                if (utflen <= 0) {
                        goto conv_err;
                }
        }
 
        result[o] = '\0';
        *out_len = o;
 
        befs_debug(sb, "<--- nls2utf()");
 
        return i;
 
      conv_err:
        befs_error(sb, "Name using charecter set %s contains a charecter that "
                   "cannot be converted to unicode.", nls->charset);
        befs_debug(sb, "<--- nls2utf()");
        kfree(result);
        return -EILSEQ;
}
 
/****Xattr****/
 
static ssize_t
befs_listxattr(struct dentry *dentry, char *buffer, size_t size)
{
        printk(KERN_ERR "befs_listxattr called\n");
        return 0;
}
 
static ssize_t
befs_getxattr(struct dentry *dentry, const char *name,
              void *buffer, size_t size)
{
        return 0;
}
 
static int
befs_setxattr(struct dentry *dentry, const char *name,
              void *value, size_t size, int flags)
{
        return 0;
}
 
static int
befs_removexattr(struct dentry *dentry, const char *name)
{
        return 0;
}
 
/****Superblock****/
 
static int
parse_options(char *options, befs_mount_options * opts)
{
        char *this_char;
        char *value;
        int ret = 1;
 
        /* Initialize options */
        opts->uid = 0;
        opts->gid = 0;
        opts->use_uid = 0;
        opts->use_gid = 0;
        opts->iocharset = NULL;
        opts->debug = 0;
 
        if (!options)
                return ret;
 
        for (this_char = strtok(options, ","); this_char != NULL;
             this_char = strtok(NULL, ",")) {
 
                if ((value = strchr(this_char, '=')) != NULL)
                        *value++ = 0;
 
                if (!strcmp(this_char, "uid")) {
                        if (!value || !*value) {
                                ret = 0;
                        } else {
                                opts->uid = simple_strtoul(value, &value, 0);
                                opts->use_uid = 1;
                                if (*value) {
                                        printk(KERN_ERR "BEFS: Invalid uid "
                                               "option: %s\n", value);
                                        ret = 0;
                                }
                        }
                } else if (!strcmp(this_char, "gid")) {
                        if (!value || !*value)
                                ret = 0;
                        else {
                                opts->gid = simple_strtoul(value, &value, 0);
                                opts->use_gid = 1;
                                if (*value) {
                                        printk(KERN_ERR
                                               "BEFS: Invalid gid option: "
                                               "%s\n", value);
                                        ret = 0;
                                }
                        }
                } else if (!strcmp(this_char, "iocharset") && value) {
                        char *p = value;
                        int len;
 
                        while (*value && *value != ',')
                                value++;
                        len = value - p;
                        if (len) {
                                char *buffer = kmalloc(len + 1, GFP_NOFS);
                                if (buffer) {
                                        opts->iocharset = buffer;
                                        memcpy(buffer, p, len);
                                        buffer[len] = 0;
 
                                } else {
                                        printk(KERN_ERR "BEFS: "
                                               "cannot allocate memory\n");
                                        ret = 0;
                                }
                        }
                } else if (!strcmp(this_char, "debug")) {
                        opts->debug = 1;
                }
        }
 
        return ret;
}
 
/* This function has the responsibiltiy of getting the
 * filesystem ready for unmounting.
 * Basicly, we free everything that we allocated in
 * befs_read_inode
 */
static void
befs_put_super(struct super_block *sb)
{
        if (BEFS_SB(sb)->mount_opts.iocharset) {
                kfree(BEFS_SB(sb)->mount_opts.iocharset);
                BEFS_SB(sb)->mount_opts.iocharset = NULL;
        }
 
        if (BEFS_SB(sb)->nls) {
                unload_nls(BEFS_SB(sb)->nls);
                BEFS_SB(sb)->nls = NULL;
        }
 
        if (sb->u.generic_sbp) {
                kfree(sb->u.generic_sbp);
                sb->u.generic_sbp = NULL;
        }
        return;
}
 
/* Allocate private field of the superblock, fill it.
 *
 * Finish filling the public superblock fields
 * Make the root directory
 * Load a set of NLS translations if needed.
 */
static struct super_block *
befs_read_super(struct super_block *sb, void *data, int silent)
{
        struct buffer_head *bh;
        befs_sb_info *befs_sb;
        befs_super_block *disk_sb;
        int blocksize;
 
        const unsigned long sb_block = 0;
        const off_t x86_sb_off = 512;
 
        sb->u.generic_sbp = kmalloc(sizeof (struct befs_sb_info), GFP_NOFS);
        if (sb->u.generic_sbp == NULL) {
                printk(KERN_ERR
                       "BeFS(%s): Unable to allocate memory for private "
                       "portion of superblock. Bailing.\n",
                       kdevname(sb->s_dev));
                goto unaquire_none;
        }
        befs_sb = BEFS_SB(sb);
 
        if (!parse_options((char *) data, &befs_sb->mount_opts)) {
                befs_error(sb, "cannot parse mount options");
                goto unaquire_priv_sbp;
        }
 
        befs_debug(sb, "---> befs_read_super()");
 
#ifndef CONFIG_BEFS_RW
        if (!(sb->s_flags & MS_RDONLY)) {
                befs_warning(sb,
                             "No write support. Marking filesystem read-only");
                sb->s_flags |= MS_RDONLY;
        }
#endif                          /* CONFIG_BEFS_RW */
 
        /*
         * Set dummy blocksize to read super block.
         * Will be set to real fs blocksize later.
         *
         * Linux 2.4.10 and later refuse to read blocks smaller than
         * the hardsect size for the device. But we also need to read at
         * least 1k to get the second 512 bytes of the volume.
         * -WD 10-26-01
         */
        blocksize = max_t(int, get_hardsect_size(sb->s_dev), 1024);
        set_blocksize(sb->s_dev, blocksize);
 
        if (!(bh = bread(sb->s_dev, sb_block, blocksize))) {
                befs_error(sb, "unable to read superblock");
                goto unaquire_priv_sbp;
        }
 
        /* account for offset of super block on x86 */
        disk_sb = (befs_super_block *) bh->b_data;
        if ((le32_to_cpu(disk_sb->magic1) == BEFS_SUPER_MAGIC1) ||
            (be32_to_cpu(disk_sb->magic1) == BEFS_SUPER_MAGIC1)) {
                befs_debug(sb, "Using PPC superblock location");
        } else {
                befs_debug(sb, "Using x86 superblock location");
                disk_sb =
                    (befs_super_block *) ((void *) bh->b_data + x86_sb_off);
        }
 
        if (befs_load_sb(sb, disk_sb) != BEFS_OK)
                goto unaquire_bh;
 
        befs_dump_super_block(sb, disk_sb);
 
        brelse(bh);
 
        if (befs_check_sb(sb) != BEFS_OK)
                goto unaquire_priv_sbp;
 
        /*
         * set up enough so that it can read an inode
         * Fill in kernel superblock fields from private sb
         */
        sb->s_magic = BEFS_SUPER_MAGIC;
        sb->s_blocksize = (ulong) befs_sb->block_size;
        sb->s_blocksize_bits = (unsigned char) befs_sb->block_shift;
        sb->s_op = (struct super_operations *) &befs_sops;
        sb->s_root =
            d_alloc_root(iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir))));
        if (!sb->s_root) {
                befs_error(sb, "get root inode failed");
                goto unaquire_priv_sbp;
        }
 
        /* load nls library */
        if (befs_sb->mount_opts.iocharset) {
                befs_debug(sb, "Loading nls: %s",
                           befs_sb->mount_opts.iocharset);
                befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset);
                if (!befs_sb->nls) {
                        befs_warning(sb, "Cannot load nls %s"
                                     "loding default nls",
                                     befs_sb->mount_opts.iocharset);
                        befs_sb->nls = load_nls_default();
                }
        }
 
        /* Set real blocksize of fs */
        set_blocksize(sb->s_dev, (int) befs_sb->block_size);
 
        return sb;
/*****************/
      unaquire_bh:
        brelse(bh);
 
      unaquire_priv_sbp:
        kfree(sb->u.generic_sbp);
 
      unaquire_none:
        sb->s_dev = 0;
        sb->u.generic_sbp = NULL;
        return NULL;
}
 
static int
befs_remount(struct super_block *sb, int *flags, char *data)
{
        if (!(*flags & MS_RDONLY))
                return -EINVAL;
        return 0;
}
 
static int
befs_statfs(struct super_block *sb, struct statfs *buf)
{
 
        befs_debug(sb, "---> befs_statfs()");
 
        buf->f_type = BEFS_SUPER_MAGIC;
        buf->f_bsize = sb->s_blocksize;
        buf->f_blocks = BEFS_SB(sb)->num_blocks;
        buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks;
        buf->f_bavail = buf->f_bfree;
        buf->f_files = 0;        /* UNKNOWN */
        buf->f_ffree = 0;        /* UNKNOWN */
        buf->f_namelen = BEFS_NAME_LEN;
 
        befs_debug(sb, "<--- befs_statfs()");
 
        return 0;
}
 
/*
        Makes a variable of type file_system_type,
        named befs_fs_tipe, identified by the "befs" string,
        and containing a reference to the befs_read_super function
 
        Macro declared in <linux/fs.h>
*/
static DECLARE_FSTYPE_DEV(befs_fs_type, "befs", befs_read_super);
 
static int __init
init_befs_fs(void)
{
        int err;
 
        printk(KERN_INFO "BeFS version: %s\n", BEFS_VERSION);
 
        err = befs_init_inodecache();
        if (err)
                return err;
 
        return register_filesystem(&befs_fs_type);
}
 
static void __exit
exit_befs_fs(void)
{
        befs_destroy_inodecache();
 
        unregister_filesystem(&befs_fs_type);
}
 
/*
Macros that typecheck the init and exit functions,
ensures that they are called at init and cleanup,
and eliminates warnings about unused functions.
*/
module_init(init_befs_fs)
    module_exit(exit_befs_fs)
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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [fs/] [befs/] [linuxvfs.c] - Blame information for rev 1765

Line No.	Rev	Author	Line
1	1275	phoenix	`/*`
2			`* linux/fs/befs/linuxvfs.c`
3			`*`
4			`* Copyright (C) 2001 Will Dyson <will_dyson@pobox.com`
5			`*`
6			`*/`
7
8			`#include <linux/blkdev.h>`
9			`#include <linux/init.h>`
10			`#include <linux/module.h>`
11			`#include <linux/slab.h>`
12			`#include <linux/errno.h>`
13			`#include <linux/fs.h>`
14			`#include <linux/stat.h>`
15			`#include <linux/string.h>`
16			`#include <linux/nls.h>`
17
18			`#include "befs.h"`
19			`#include "btree.h"`
20			`#include "inode.h"`
21			`#include "datastream.h"`
22			`#include "super.h"`
23			`#include "io.h"`
24			`#include "endian.h"`
25
26			`EXPORT_NO_SYMBOLS;`
27			`MODULE_DESCRIPTION("BeOS File System (BeFS) driver");`
28			`MODULE_AUTHOR("Will Dyson");`
29			`MODULE_LICENSE("GPL");`
30
31			`/* The units the vfs expects inode->i_blocks to be in */`
32			`#define VFS_BLOCK_SIZE 512`
33
34			`static int befs_readdir(struct file , void , filldir_t);`
35			`static int befs_get_block(struct inode , long, struct buffer_head , int);`
36			`static int befs_readpage(struct file file, struct page page);`
37			`static int befs_bmap(struct address_space *mapping, long block);`
38			`static struct dentry befs_lookup(struct inode , struct dentry *);`
39			`static void befs_read_inode(struct inode *ino);`
40			`static void befs_clear_inode(struct inode *ino);`