![Josef 'Jeff' Sipek](/assets/img/avatar_default.png)
This patch is inspired by Arjan's "Patch series to mark struct file_operations and struct inode_operations const". Compile tested with gcc & sparse. Signed-off-by: Josef 'Jeff' Sipek <jsipek@cs.sunysb.edu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
604 lines
15 KiB
C
604 lines
15 KiB
C
/*
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* QNX4 file system, Linux implementation.
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*
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* Version : 0.2.1
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*
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* Using parts of the xiafs filesystem.
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*
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* History :
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*
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* 01-06-1998 by Richard Frowijn : first release.
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* 20-06-1998 by Frank Denis : Linux 2.1.99+ support, boot signature, misc.
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* 30-06-1998 by Frank Denis : first step to write inodes.
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/qnx4_fs.h>
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#include <linux/init.h>
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#include <linux/highuid.h>
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#include <linux/smp_lock.h>
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#include <linux/pagemap.h>
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#include <linux/buffer_head.h>
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#include <linux/vfs.h>
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#include <asm/uaccess.h>
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#define QNX4_VERSION 4
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#define QNX4_BMNAME ".bitmap"
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static const struct super_operations qnx4_sops;
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#ifdef CONFIG_QNX4FS_RW
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int qnx4_sync_inode(struct inode *inode)
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{
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int err = 0;
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# if 0
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struct buffer_head *bh;
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bh = qnx4_update_inode(inode);
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if (bh && buffer_dirty(bh))
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{
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sync_dirty_buffer(bh);
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if (buffer_req(bh) && !buffer_uptodate(bh))
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{
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printk ("IO error syncing qnx4 inode [%s:%08lx]\n",
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inode->i_sb->s_id, inode->i_ino);
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err = -1;
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}
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brelse (bh);
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} else if (!bh) {
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err = -1;
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}
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# endif
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return err;
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}
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static void qnx4_delete_inode(struct inode *inode)
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{
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QNX4DEBUG(("qnx4: deleting inode [%lu]\n", (unsigned long) inode->i_ino));
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truncate_inode_pages(&inode->i_data, 0);
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inode->i_size = 0;
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qnx4_truncate(inode);
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lock_kernel();
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qnx4_free_inode(inode);
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unlock_kernel();
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}
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static void qnx4_write_super(struct super_block *sb)
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{
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lock_kernel();
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QNX4DEBUG(("qnx4: write_super\n"));
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sb->s_dirt = 0;
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unlock_kernel();
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}
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static int qnx4_write_inode(struct inode *inode, int unused)
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{
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struct qnx4_inode_entry *raw_inode;
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int block, ino;
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struct buffer_head *bh;
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ino = inode->i_ino;
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QNX4DEBUG(("qnx4: write inode 1.\n"));
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if (inode->i_nlink == 0) {
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return 0;
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}
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if (!ino) {
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printk("qnx4: bad inode number on dev %s: %d is out of range\n",
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inode->i_sb->s_id, ino);
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return -EIO;
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}
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QNX4DEBUG(("qnx4: write inode 2.\n"));
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block = ino / QNX4_INODES_PER_BLOCK;
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lock_kernel();
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if (!(bh = sb_bread(inode->i_sb, block))) {
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printk("qnx4: major problem: unable to read inode from dev "
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"%s\n", inode->i_sb->s_id);
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unlock_kernel();
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return -EIO;
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}
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raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
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(ino % QNX4_INODES_PER_BLOCK);
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raw_inode->di_mode = cpu_to_le16(inode->i_mode);
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raw_inode->di_uid = cpu_to_le16(fs_high2lowuid(inode->i_uid));
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raw_inode->di_gid = cpu_to_le16(fs_high2lowgid(inode->i_gid));
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raw_inode->di_nlink = cpu_to_le16(inode->i_nlink);
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raw_inode->di_size = cpu_to_le32(inode->i_size);
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raw_inode->di_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
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raw_inode->di_atime = cpu_to_le32(inode->i_atime.tv_sec);
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raw_inode->di_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
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raw_inode->di_first_xtnt.xtnt_size = cpu_to_le32(inode->i_blocks);
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mark_buffer_dirty(bh);
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brelse(bh);
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unlock_kernel();
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return 0;
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}
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#endif
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static void qnx4_put_super(struct super_block *sb);
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static struct inode *qnx4_alloc_inode(struct super_block *sb);
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static void qnx4_destroy_inode(struct inode *inode);
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static void qnx4_read_inode(struct inode *);
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static int qnx4_remount(struct super_block *sb, int *flags, char *data);
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static int qnx4_statfs(struct dentry *, struct kstatfs *);
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static const struct super_operations qnx4_sops =
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{
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.alloc_inode = qnx4_alloc_inode,
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.destroy_inode = qnx4_destroy_inode,
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.read_inode = qnx4_read_inode,
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.put_super = qnx4_put_super,
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.statfs = qnx4_statfs,
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.remount_fs = qnx4_remount,
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#ifdef CONFIG_QNX4FS_RW
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.write_inode = qnx4_write_inode,
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.delete_inode = qnx4_delete_inode,
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.write_super = qnx4_write_super,
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#endif
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};
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static int qnx4_remount(struct super_block *sb, int *flags, char *data)
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{
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struct qnx4_sb_info *qs;
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qs = qnx4_sb(sb);
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qs->Version = QNX4_VERSION;
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#ifndef CONFIG_QNX4FS_RW
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*flags |= MS_RDONLY;
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#endif
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if (*flags & MS_RDONLY) {
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return 0;
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}
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mark_buffer_dirty(qs->sb_buf);
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return 0;
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}
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static struct buffer_head *qnx4_getblk(struct inode *inode, int nr,
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int create)
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{
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struct buffer_head *result = NULL;
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if ( nr >= 0 )
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nr = qnx4_block_map( inode, nr );
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if (nr) {
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result = sb_getblk(inode->i_sb, nr);
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return result;
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}
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if (!create) {
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return NULL;
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}
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#if 0
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tmp = qnx4_new_block(inode->i_sb);
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if (!tmp) {
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return NULL;
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}
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result = sb_getblk(inode->i_sb, tmp);
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if (tst) {
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qnx4_free_block(inode->i_sb, tmp);
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brelse(result);
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goto repeat;
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}
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tst = tmp;
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#endif
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inode->i_ctime = CURRENT_TIME_SEC;
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mark_inode_dirty(inode);
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return result;
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}
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struct buffer_head *qnx4_bread(struct inode *inode, int block, int create)
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{
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struct buffer_head *bh;
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bh = qnx4_getblk(inode, block, create);
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if (!bh || buffer_uptodate(bh)) {
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return bh;
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}
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ll_rw_block(READ, 1, &bh);
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wait_on_buffer(bh);
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if (buffer_uptodate(bh)) {
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return bh;
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}
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brelse(bh);
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return NULL;
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}
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static int qnx4_get_block( struct inode *inode, sector_t iblock, struct buffer_head *bh, int create )
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{
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unsigned long phys;
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QNX4DEBUG(("qnx4: qnx4_get_block inode=[%ld] iblock=[%ld]\n",inode->i_ino,iblock));
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phys = qnx4_block_map( inode, iblock );
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if ( phys ) {
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// logical block is before EOF
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map_bh(bh, inode->i_sb, phys);
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} else if ( create ) {
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// to be done.
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}
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return 0;
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}
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unsigned long qnx4_block_map( struct inode *inode, long iblock )
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{
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int ix;
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long offset, i_xblk;
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unsigned long block = 0;
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struct buffer_head *bh = NULL;
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struct qnx4_xblk *xblk = NULL;
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struct qnx4_inode_entry *qnx4_inode = qnx4_raw_inode(inode);
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u16 nxtnt = le16_to_cpu(qnx4_inode->di_num_xtnts);
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if ( iblock < le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_size) ) {
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// iblock is in the first extent. This is easy.
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block = le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_blk) + iblock - 1;
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} else {
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// iblock is beyond first extent. We have to follow the extent chain.
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i_xblk = le32_to_cpu(qnx4_inode->di_xblk);
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offset = iblock - le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_size);
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ix = 0;
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while ( --nxtnt > 0 ) {
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if ( ix == 0 ) {
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// read next xtnt block.
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bh = sb_bread(inode->i_sb, i_xblk - 1);
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if ( !bh ) {
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QNX4DEBUG(("qnx4: I/O error reading xtnt block [%ld])\n", i_xblk - 1));
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return -EIO;
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}
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xblk = (struct qnx4_xblk*)bh->b_data;
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if ( memcmp( xblk->xblk_signature, "IamXblk", 7 ) ) {
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QNX4DEBUG(("qnx4: block at %ld is not a valid xtnt\n", qnx4_inode->i_xblk));
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return -EIO;
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}
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}
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if ( offset < le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size) ) {
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// got it!
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block = le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_blk) + offset - 1;
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break;
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}
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offset -= le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size);
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if ( ++ix >= xblk->xblk_num_xtnts ) {
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i_xblk = le32_to_cpu(xblk->xblk_next_xblk);
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ix = 0;
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brelse( bh );
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bh = NULL;
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}
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}
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if ( bh )
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brelse( bh );
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}
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QNX4DEBUG(("qnx4: mapping block %ld of inode %ld = %ld\n",iblock,inode->i_ino,block));
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return block;
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}
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static int qnx4_statfs(struct dentry *dentry, struct kstatfs *buf)
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{
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struct super_block *sb = dentry->d_sb;
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lock_kernel();
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buf->f_type = sb->s_magic;
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buf->f_bsize = sb->s_blocksize;
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buf->f_blocks = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size) * 8;
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buf->f_bfree = qnx4_count_free_blocks(sb);
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buf->f_bavail = buf->f_bfree;
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buf->f_namelen = QNX4_NAME_MAX;
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unlock_kernel();
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return 0;
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}
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/*
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* Check the root directory of the filesystem to make sure
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* it really _is_ a qnx4 filesystem, and to check the size
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* of the directory entry.
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*/
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static const char *qnx4_checkroot(struct super_block *sb)
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{
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struct buffer_head *bh;
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struct qnx4_inode_entry *rootdir;
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int rd, rl;
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int i, j;
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int found = 0;
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if (*(qnx4_sb(sb)->sb->RootDir.di_fname) != '/') {
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return "no qnx4 filesystem (no root dir).";
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} else {
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QNX4DEBUG(("QNX4 filesystem found on dev %s.\n", sb->s_id));
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rd = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_blk) - 1;
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rl = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_size);
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for (j = 0; j < rl; j++) {
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bh = sb_bread(sb, rd + j); /* root dir, first block */
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if (bh == NULL) {
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return "unable to read root entry.";
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}
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for (i = 0; i < QNX4_INODES_PER_BLOCK; i++) {
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rootdir = (struct qnx4_inode_entry *) (bh->b_data + i * QNX4_DIR_ENTRY_SIZE);
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if (rootdir->di_fname != NULL) {
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QNX4DEBUG(("Rootdir entry found : [%s]\n", rootdir->di_fname));
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if (!strncmp(rootdir->di_fname, QNX4_BMNAME, sizeof QNX4_BMNAME)) {
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found = 1;
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qnx4_sb(sb)->BitMap = kmalloc( sizeof( struct qnx4_inode_entry ), GFP_KERNEL );
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if (!qnx4_sb(sb)->BitMap) {
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brelse (bh);
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return "not enough memory for bitmap inode";
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}
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memcpy( qnx4_sb(sb)->BitMap, rootdir, sizeof( struct qnx4_inode_entry ) ); /* keep bitmap inode known */
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break;
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}
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}
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}
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brelse(bh);
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if (found != 0) {
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break;
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}
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}
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if (found == 0) {
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return "bitmap file not found.";
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}
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}
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return NULL;
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}
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static int qnx4_fill_super(struct super_block *s, void *data, int silent)
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{
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struct buffer_head *bh;
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struct inode *root;
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const char *errmsg;
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struct qnx4_sb_info *qs;
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qs = kzalloc(sizeof(struct qnx4_sb_info), GFP_KERNEL);
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if (!qs)
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return -ENOMEM;
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s->s_fs_info = qs;
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sb_set_blocksize(s, QNX4_BLOCK_SIZE);
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/* Check the superblock signature. Since the qnx4 code is
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dangerous, we should leave as quickly as possible
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if we don't belong here... */
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bh = sb_bread(s, 1);
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if (!bh) {
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printk("qnx4: unable to read the superblock\n");
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goto outnobh;
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}
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if ( le32_to_cpup((__le32*) bh->b_data) != QNX4_SUPER_MAGIC ) {
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if (!silent)
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printk("qnx4: wrong fsid in superblock.\n");
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goto out;
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}
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s->s_op = &qnx4_sops;
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s->s_magic = QNX4_SUPER_MAGIC;
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#ifndef CONFIG_QNX4FS_RW
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s->s_flags |= MS_RDONLY; /* Yup, read-only yet */
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#endif
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qnx4_sb(s)->sb_buf = bh;
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qnx4_sb(s)->sb = (struct qnx4_super_block *) bh->b_data;
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/* check before allocating dentries, inodes, .. */
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errmsg = qnx4_checkroot(s);
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if (errmsg != NULL) {
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if (!silent)
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printk("qnx4: %s\n", errmsg);
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goto out;
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}
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/* does root not have inode number QNX4_ROOT_INO ?? */
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root = iget(s, QNX4_ROOT_INO * QNX4_INODES_PER_BLOCK);
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if (!root) {
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printk("qnx4: get inode failed\n");
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goto out;
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}
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s->s_root = d_alloc_root(root);
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if (s->s_root == NULL)
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goto outi;
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brelse(bh);
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return 0;
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outi:
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iput(root);
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out:
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brelse(bh);
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outnobh:
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kfree(qs);
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s->s_fs_info = NULL;
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return -EINVAL;
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}
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static void qnx4_put_super(struct super_block *sb)
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{
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struct qnx4_sb_info *qs = qnx4_sb(sb);
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kfree( qs->BitMap );
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kfree( qs );
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sb->s_fs_info = NULL;
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return;
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}
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static int qnx4_writepage(struct page *page, struct writeback_control *wbc)
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{
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return block_write_full_page(page,qnx4_get_block, wbc);
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}
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static int qnx4_readpage(struct file *file, struct page *page)
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{
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return block_read_full_page(page,qnx4_get_block);
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}
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static int qnx4_prepare_write(struct file *file, struct page *page,
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unsigned from, unsigned to)
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{
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struct qnx4_inode_info *qnx4_inode = qnx4_i(page->mapping->host);
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return cont_prepare_write(page, from, to, qnx4_get_block,
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&qnx4_inode->mmu_private);
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}
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static sector_t qnx4_bmap(struct address_space *mapping, sector_t block)
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{
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return generic_block_bmap(mapping,block,qnx4_get_block);
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}
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static const struct address_space_operations qnx4_aops = {
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.readpage = qnx4_readpage,
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.writepage = qnx4_writepage,
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.sync_page = block_sync_page,
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.prepare_write = qnx4_prepare_write,
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.commit_write = generic_commit_write,
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.bmap = qnx4_bmap
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};
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static void qnx4_read_inode(struct inode *inode)
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{
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struct buffer_head *bh;
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struct qnx4_inode_entry *raw_inode;
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int block, ino;
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struct super_block *sb = inode->i_sb;
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struct qnx4_inode_entry *qnx4_inode = qnx4_raw_inode(inode);
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ino = inode->i_ino;
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inode->i_mode = 0;
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QNX4DEBUG(("Reading inode : [%d]\n", ino));
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if (!ino) {
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printk("qnx4: bad inode number on dev %s: %d is out of range\n",
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sb->s_id, ino);
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return;
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}
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block = ino / QNX4_INODES_PER_BLOCK;
|
|
|
|
if (!(bh = sb_bread(sb, block))) {
|
|
printk("qnx4: major problem: unable to read inode from dev "
|
|
"%s\n", sb->s_id);
|
|
return;
|
|
}
|
|
raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
|
|
(ino % QNX4_INODES_PER_BLOCK);
|
|
|
|
inode->i_mode = le16_to_cpu(raw_inode->di_mode);
|
|
inode->i_uid = (uid_t)le16_to_cpu(raw_inode->di_uid);
|
|
inode->i_gid = (gid_t)le16_to_cpu(raw_inode->di_gid);
|
|
inode->i_nlink = le16_to_cpu(raw_inode->di_nlink);
|
|
inode->i_size = le32_to_cpu(raw_inode->di_size);
|
|
inode->i_mtime.tv_sec = le32_to_cpu(raw_inode->di_mtime);
|
|
inode->i_mtime.tv_nsec = 0;
|
|
inode->i_atime.tv_sec = le32_to_cpu(raw_inode->di_atime);
|
|
inode->i_atime.tv_nsec = 0;
|
|
inode->i_ctime.tv_sec = le32_to_cpu(raw_inode->di_ctime);
|
|
inode->i_ctime.tv_nsec = 0;
|
|
inode->i_blocks = le32_to_cpu(raw_inode->di_first_xtnt.xtnt_size);
|
|
|
|
memcpy(qnx4_inode, raw_inode, QNX4_DIR_ENTRY_SIZE);
|
|
if (S_ISREG(inode->i_mode)) {
|
|
inode->i_op = &qnx4_file_inode_operations;
|
|
inode->i_fop = &qnx4_file_operations;
|
|
inode->i_mapping->a_ops = &qnx4_aops;
|
|
qnx4_i(inode)->mmu_private = inode->i_size;
|
|
} else if (S_ISDIR(inode->i_mode)) {
|
|
inode->i_op = &qnx4_dir_inode_operations;
|
|
inode->i_fop = &qnx4_dir_operations;
|
|
} else if (S_ISLNK(inode->i_mode)) {
|
|
inode->i_op = &page_symlink_inode_operations;
|
|
inode->i_mapping->a_ops = &qnx4_aops;
|
|
qnx4_i(inode)->mmu_private = inode->i_size;
|
|
} else
|
|
printk("qnx4: bad inode %d on dev %s\n",ino,sb->s_id);
|
|
brelse(bh);
|
|
}
|
|
|
|
static struct kmem_cache *qnx4_inode_cachep;
|
|
|
|
static struct inode *qnx4_alloc_inode(struct super_block *sb)
|
|
{
|
|
struct qnx4_inode_info *ei;
|
|
ei = kmem_cache_alloc(qnx4_inode_cachep, GFP_KERNEL);
|
|
if (!ei)
|
|
return NULL;
|
|
return &ei->vfs_inode;
|
|
}
|
|
|
|
static void qnx4_destroy_inode(struct inode *inode)
|
|
{
|
|
kmem_cache_free(qnx4_inode_cachep, qnx4_i(inode));
|
|
}
|
|
|
|
static void init_once(void *foo, struct kmem_cache * cachep,
|
|
unsigned long flags)
|
|
{
|
|
struct qnx4_inode_info *ei = (struct qnx4_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)
|
|
{
|
|
qnx4_inode_cachep = kmem_cache_create("qnx4_inode_cache",
|
|
sizeof(struct qnx4_inode_info),
|
|
0, (SLAB_RECLAIM_ACCOUNT|
|
|
SLAB_MEM_SPREAD),
|
|
init_once, NULL);
|
|
if (qnx4_inode_cachep == NULL)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
static void destroy_inodecache(void)
|
|
{
|
|
kmem_cache_destroy(qnx4_inode_cachep);
|
|
}
|
|
|
|
static int qnx4_get_sb(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data, struct vfsmount *mnt)
|
|
{
|
|
return get_sb_bdev(fs_type, flags, dev_name, data, qnx4_fill_super,
|
|
mnt);
|
|
}
|
|
|
|
static struct file_system_type qnx4_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "qnx4",
|
|
.get_sb = qnx4_get_sb,
|
|
.kill_sb = kill_block_super,
|
|
.fs_flags = FS_REQUIRES_DEV,
|
|
};
|
|
|
|
static int __init init_qnx4_fs(void)
|
|
{
|
|
int err;
|
|
|
|
err = init_inodecache();
|
|
if (err)
|
|
return err;
|
|
|
|
err = register_filesystem(&qnx4_fs_type);
|
|
if (err) {
|
|
destroy_inodecache();
|
|
return err;
|
|
}
|
|
|
|
printk("QNX4 filesystem 0.2.3 registered.\n");
|
|
return 0;
|
|
}
|
|
|
|
static void __exit exit_qnx4_fs(void)
|
|
{
|
|
unregister_filesystem(&qnx4_fs_type);
|
|
destroy_inodecache();
|
|
}
|
|
|
|
module_init(init_qnx4_fs)
|
|
module_exit(exit_qnx4_fs)
|
|
MODULE_LICENSE("GPL");
|
|
|