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252 lines
5.8 KiB
252 lines
5.8 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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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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#include <linux/fiemap.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 user_namespace *mnt_userns, |
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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 user_namespace *mnt_userns, |
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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 user_namespace *mnt_userns, struct inode *dir, |
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struct dentry *dentry, 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 user_namespace *mnt_userns, struct inode *dir, |
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struct dentry *dentry, 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 user_namespace *mnt_userns, |
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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 user_namespace *mnt_userns, |
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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 user_namespace *mnt_userns, |
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const struct path *path, struct kstat *stat, |
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u32 request_mask, unsigned int query_flags) |
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{ |
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return -EIO; |
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} |
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static int bad_inode_setattr(struct user_namespace *mnt_userns, |
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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, bool rcu) |
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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 timespec64 *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) |
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{ |
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return -EIO; |
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} |
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static int bad_inode_tmpfile(struct user_namespace *mnt_userns, |
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struct inode *inode, struct file *file, |
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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 user_namespace *mnt_userns, |
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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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