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Fix the race between capifs remount and node creation

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we don't want to deal with half-updated config

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2009-05-08 16:23:30 -04:00
parent 2a32cebd6c
commit b0c4f3222c
1 changed files with 8 additions and 2 deletions
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10
drivers/isdn/capi/capifs.c
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@ -75,14 +75,17 @@ static int capifs_remount(struct super_block *s, int *flags, char *data)
}
}
replace_mount_options(s, new_opt);
mutex_lock(&s->s_root->d_inode->i_mutex);
replace_mount_options(s, new_opt);
config.setuid = setuid;
config.setgid = setgid;
config.uid = uid;
config.gid = gid;
config.mode = mode;
mutex_unlock(&s->s_root->d_inode->i_mutex);
return 0;
}
@ -153,13 +156,16 @@ void capifs_new_ncci(unsigned int number, dev_t device)
if (!inode)
return;
inode->i_ino = number+2;
dentry = get_node(number);
/* config contents is protected by root's i_mutex */
inode->i_uid = config.setuid ? config.uid : current_fsuid();
inode->i_gid = config.setgid ? config.gid : current_fsgid();
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
init_special_inode(inode, S_IFCHR|config.mode, device);
//inode->i_op = &capifs_file_inode_operations;
dentry = get_node(number);
if (!IS_ERR(dentry) && !dentry->d_inode)
d_instantiate(dentry, inode);
mutex_unlock(&capifs_root->d_inode->i_mutex);