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![Miklos Szeredi](/assets/img/avatar_default.png)
New inode operations were forgotten to be added to bad_inode. Most of the time the op is checked for NULL before being called but marking the inode bad and the check can race (very unlikely). However in case of ->get_link() only DCACHE_SYMLINK_TYPE is checked before calling the op, so there's no race and will definitely oops when trying to follow links on such a beast. Also remove comments about extinct ops. Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> Cc: <stable@vger.kernel.org>
242 lines
5.3 KiB
C
242 lines
5.3 KiB
C
/*
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* linux/fs/bad_inode.c
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*
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* Copyright (C) 1997, Stephen Tweedie
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*
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* Provide stub functions for unreadable inodes
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*
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* Fabian Frederick : August 2003 - All file operations assigned to EIO
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*/
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#include <linux/fs.h>
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#include <linux/export.h>
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#include <linux/stat.h>
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#include <linux/time.h>
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#include <linux/namei.h>
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#include <linux/poll.h>
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static int bad_file_open(struct inode *inode, struct file *filp)
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{
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return -EIO;
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}
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static const struct file_operations bad_file_ops =
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{
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.open = bad_file_open,
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};
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static int bad_inode_create (struct inode *dir, struct dentry *dentry,
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umode_t mode, bool excl)
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{
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return -EIO;
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}
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static struct dentry *bad_inode_lookup(struct inode *dir,
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struct dentry *dentry, unsigned int flags)
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{
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return ERR_PTR(-EIO);
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}
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static int bad_inode_link (struct dentry *old_dentry, struct inode *dir,
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struct dentry *dentry)
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{
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return -EIO;
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}
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static int bad_inode_unlink(struct inode *dir, struct dentry *dentry)
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{
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return -EIO;
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}
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static int bad_inode_symlink (struct inode *dir, struct dentry *dentry,
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const char *symname)
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{
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return -EIO;
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}
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static int bad_inode_mkdir(struct inode *dir, struct dentry *dentry,
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umode_t mode)
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{
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return -EIO;
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}
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static int bad_inode_rmdir (struct inode *dir, struct dentry *dentry)
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{
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return -EIO;
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}
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static int bad_inode_mknod (struct inode *dir, struct dentry *dentry,
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umode_t mode, dev_t rdev)
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{
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return -EIO;
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}
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static int bad_inode_rename2(struct inode *old_dir, struct dentry *old_dentry,
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struct inode *new_dir, struct dentry *new_dentry,
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unsigned int flags)
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{
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return -EIO;
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}
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static int bad_inode_readlink(struct dentry *dentry, char __user *buffer,
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int buflen)
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{
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return -EIO;
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}
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static int bad_inode_permission(struct inode *inode, int mask)
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{
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return -EIO;
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}
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static int bad_inode_getattr(struct vfsmount *mnt, struct dentry *dentry,
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struct kstat *stat)
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{
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return -EIO;
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}
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static int bad_inode_setattr(struct dentry *direntry, struct iattr *attrs)
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{
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return -EIO;
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}
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static ssize_t bad_inode_listxattr(struct dentry *dentry, char *buffer,
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size_t buffer_size)
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{
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return -EIO;
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}
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static const char *bad_inode_get_link(struct dentry *dentry,
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struct inode *inode,
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struct delayed_call *done)
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{
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return ERR_PTR(-EIO);
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}
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static struct posix_acl *bad_inode_get_acl(struct inode *inode, int type)
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{
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return ERR_PTR(-EIO);
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}
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static int bad_inode_fiemap(struct inode *inode,
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struct fiemap_extent_info *fieinfo, u64 start,
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u64 len)
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{
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return -EIO;
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}
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static int bad_inode_update_time(struct inode *inode, struct timespec *time,
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int flags)
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{
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return -EIO;
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}
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static int bad_inode_atomic_open(struct inode *inode, struct dentry *dentry,
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struct file *file, unsigned int open_flag,
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umode_t create_mode, int *opened)
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{
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return -EIO;
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}
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static int bad_inode_tmpfile(struct inode *inode, struct dentry *dentry,
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umode_t mode)
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{
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return -EIO;
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}
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static int bad_inode_set_acl(struct inode *inode, struct posix_acl *acl,
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int type)
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{
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return -EIO;
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}
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static const struct inode_operations bad_inode_ops =
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{
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.create = bad_inode_create,
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.lookup = bad_inode_lookup,
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.link = bad_inode_link,
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.unlink = bad_inode_unlink,
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.symlink = bad_inode_symlink,
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.mkdir = bad_inode_mkdir,
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.rmdir = bad_inode_rmdir,
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.mknod = bad_inode_mknod,
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.rename = bad_inode_rename2,
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.readlink = bad_inode_readlink,
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.permission = bad_inode_permission,
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.getattr = bad_inode_getattr,
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.setattr = bad_inode_setattr,
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.listxattr = bad_inode_listxattr,
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.get_link = bad_inode_get_link,
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.get_acl = bad_inode_get_acl,
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.fiemap = bad_inode_fiemap,
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.update_time = bad_inode_update_time,
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.atomic_open = bad_inode_atomic_open,
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.tmpfile = bad_inode_tmpfile,
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.set_acl = bad_inode_set_acl,
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};
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/*
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* When a filesystem is unable to read an inode due to an I/O error in
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* its read_inode() function, it can call make_bad_inode() to return a
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* set of stubs which will return EIO errors as required.
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*
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* We only need to do limited initialisation: all other fields are
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* preinitialised to zero automatically.
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*/
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/**
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* make_bad_inode - mark an inode bad due to an I/O error
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* @inode: Inode to mark bad
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*
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* When an inode cannot be read due to a media or remote network
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* failure this function makes the inode "bad" and causes I/O operations
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* on it to fail from this point on.
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*/
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void make_bad_inode(struct inode *inode)
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{
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remove_inode_hash(inode);
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inode->i_mode = S_IFREG;
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inode->i_atime = inode->i_mtime = inode->i_ctime =
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current_time(inode);
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inode->i_op = &bad_inode_ops;
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inode->i_opflags &= ~IOP_XATTR;
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inode->i_fop = &bad_file_ops;
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}
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EXPORT_SYMBOL(make_bad_inode);
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/*
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* This tests whether an inode has been flagged as bad. The test uses
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* &bad_inode_ops to cover the case of invalidated inodes as well as
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* those created by make_bad_inode() above.
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*/
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/**
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* is_bad_inode - is an inode errored
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* @inode: inode to test
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*
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* Returns true if the inode in question has been marked as bad.
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*/
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bool is_bad_inode(struct inode *inode)
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{
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return (inode->i_op == &bad_inode_ops);
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}
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EXPORT_SYMBOL(is_bad_inode);
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/**
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* iget_failed - Mark an under-construction inode as dead and release it
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* @inode: The inode to discard
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*
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* Mark an under-construction inode as dead and release it.
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*/
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void iget_failed(struct inode *inode)
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{
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make_bad_inode(inode);
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unlock_new_inode(inode);
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iput(inode);
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}
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EXPORT_SYMBOL(iget_failed);
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