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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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qnx4: clean qnx4_fill_super() up
* pass on-disk superblock to qnx4_chkroot() explicitly * don't leave stale (and unused) pointers in qnx4_super_block * free stuff in ->kill_sb(); ->put_super() becomes empty and dies * simplify failure exits Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
parent
5a9ed6f5e7
commit
208adb6403
@ -27,7 +27,6 @@
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static const struct super_operations qnx4_sops;
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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 int qnx4_remount(struct super_block *sb, int *flags, char *data);
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@ -37,7 +36,6 @@ 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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.put_super = qnx4_put_super,
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.statfs = qnx4_statfs,
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.remount_fs = qnx4_remount,
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};
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@ -148,18 +146,19 @@ static int qnx4_statfs(struct dentry *dentry, struct kstatfs *buf)
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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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static const char *qnx4_checkroot(struct super_block *sb,
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struct qnx4_super_block *s)
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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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if (*(qnx4_sb(sb)->sb->RootDir.di_fname) != '/')
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if (s->RootDir.di_fname[0] != '/' || s->RootDir.di_fname[1] != '\0')
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return "no qnx4 filesystem (no root dir).";
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QNX4DEBUG((KERN_NOTICE "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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rd = le32_to_cpu(s->RootDir.di_first_xtnt.xtnt_blk) - 1;
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rl = le32_to_cpu(s->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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@ -189,7 +188,6 @@ static int qnx4_fill_super(struct super_block *s, void *data, int silent)
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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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int ret = -EINVAL;
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qs = kzalloc(sizeof(struct qnx4_sb_info), GFP_KERNEL);
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if (!qs)
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@ -198,67 +196,50 @@ static int qnx4_fill_super(struct super_block *s, void *data, int silent)
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sb_set_blocksize(s, QNX4_BLOCK_SIZE);
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s->s_op = &qnx4_sops;
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s->s_magic = QNX4_SUPER_MAGIC;
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s->s_flags |= MS_RDONLY; /* Yup, read-only yet */
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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(KERN_ERR "qnx4: unable to read the superblock\n");
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goto outnobh;
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return -EINVAL;
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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(KERN_ERR "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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s->s_flags |= MS_RDONLY; /* Yup, read-only yet */
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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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errmsg = qnx4_checkroot(s, (struct qnx4_super_block *) bh->b_data);
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brelse(bh);
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if (errmsg != NULL) {
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if (!silent)
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printk(KERN_ERR "qnx4: %s\n", errmsg);
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goto out;
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return -EINVAL;
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}
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/* does root not have inode number QNX4_ROOT_INO ?? */
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root = qnx4_iget(s, QNX4_ROOT_INO * QNX4_INODES_PER_BLOCK);
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if (IS_ERR(root)) {
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printk(KERN_ERR "qnx4: get inode failed\n");
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ret = PTR_ERR(root);
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goto outb;
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return PTR_ERR(root);
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}
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ret = -ENOMEM;
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s->s_root = d_make_root(root);
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if (s->s_root == NULL)
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goto outb;
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return -ENOMEM;
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brelse(bh);
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return 0;
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outb:
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kfree(qs->BitMap);
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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 ret;
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}
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static void qnx4_put_super(struct super_block *sb)
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static void qnx4_kill_sb(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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kill_block_super(sb);
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if (qs) {
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kfree(qs->BitMap);
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kfree(qs);
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}
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}
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static int qnx4_readpage(struct file *file, struct page *page)
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@ -409,7 +390,7 @@ static struct file_system_type qnx4_fs_type = {
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.owner = THIS_MODULE,
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.name = "qnx4",
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.mount = qnx4_mount,
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.kill_sb = kill_block_super,
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.kill_sb = qnx4_kill_sb,
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.fs_flags = FS_REQUIRES_DEV,
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};
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MODULE_ALIAS_FS("qnx4");
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@ -10,8 +10,6 @@
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#endif
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struct qnx4_sb_info {
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struct buffer_head *sb_buf; /* superblock buffer */
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struct qnx4_super_block *sb; /* our superblock */
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unsigned int Version; /* may be useful */
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struct qnx4_inode_entry *BitMap; /* useful */
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};
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