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Linux/fs/bad_inode.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  *  linux/fs/bad_inode.c
  4  *
  5  *  Copyright (C) 1997, Stephen Tweedie
  6  *
  7  *  Provide stub functions for unreadable inodes
  8  *
  9  *  Fabian Frederick : August 2003 - All file operations assigned to EIO
 10  */
 11 
 12 #include <linux/fs.h>
 13 #include <linux/export.h>
 14 #include <linux/stat.h>
 15 #include <linux/time.h>
 16 #include <linux/namei.h>
 17 #include <linux/poll.h>
 18 
 19 static int bad_file_open(struct inode *inode, struct file *filp)
 20 {
 21         return -EIO;
 22 }
 23 
 24 static const struct file_operations bad_file_ops =
 25 {
 26         .open           = bad_file_open,
 27 };
 28 
 29 static int bad_inode_create (struct inode *dir, struct dentry *dentry,
 30                 umode_t mode, bool excl)
 31 {
 32         return -EIO;
 33 }
 34 
 35 static struct dentry *bad_inode_lookup(struct inode *dir,
 36                         struct dentry *dentry, unsigned int flags)
 37 {
 38         return ERR_PTR(-EIO);
 39 }
 40 
 41 static int bad_inode_link (struct dentry *old_dentry, struct inode *dir,
 42                 struct dentry *dentry)
 43 {
 44         return -EIO;
 45 }
 46 
 47 static int bad_inode_unlink(struct inode *dir, struct dentry *dentry)
 48 {
 49         return -EIO;
 50 }
 51 
 52 static int bad_inode_symlink (struct inode *dir, struct dentry *dentry,
 53                 const char *symname)
 54 {
 55         return -EIO;
 56 }
 57 
 58 static int bad_inode_mkdir(struct inode *dir, struct dentry *dentry,
 59                         umode_t mode)
 60 {
 61         return -EIO;
 62 }
 63 
 64 static int bad_inode_rmdir (struct inode *dir, struct dentry *dentry)
 65 {
 66         return -EIO;
 67 }
 68 
 69 static int bad_inode_mknod (struct inode *dir, struct dentry *dentry,
 70                         umode_t mode, dev_t rdev)
 71 {
 72         return -EIO;
 73 }
 74 
 75 static int bad_inode_rename2(struct inode *old_dir, struct dentry *old_dentry,
 76                              struct inode *new_dir, struct dentry *new_dentry,
 77                              unsigned int flags)
 78 {
 79         return -EIO;
 80 }
 81 
 82 static int bad_inode_readlink(struct dentry *dentry, char __user *buffer,
 83                 int buflen)
 84 {
 85         return -EIO;
 86 }
 87 
 88 static int bad_inode_permission(struct inode *inode, int mask)
 89 {
 90         return -EIO;
 91 }
 92 
 93 static int bad_inode_getattr(const struct path *path, struct kstat *stat,
 94                              u32 request_mask, unsigned int query_flags)
 95 {
 96         return -EIO;
 97 }
 98 
 99 static int bad_inode_setattr(struct dentry *direntry, struct iattr *attrs)
100 {
101         return -EIO;
102 }
103 
104 static ssize_t bad_inode_listxattr(struct dentry *dentry, char *buffer,
105                         size_t buffer_size)
106 {
107         return -EIO;
108 }
109 
110 static const char *bad_inode_get_link(struct dentry *dentry,
111                                       struct inode *inode,
112                                       struct delayed_call *done)
113 {
114         return ERR_PTR(-EIO);
115 }
116 
117 static struct posix_acl *bad_inode_get_acl(struct inode *inode, int type)
118 {
119         return ERR_PTR(-EIO);
120 }
121 
122 static int bad_inode_fiemap(struct inode *inode,
123                             struct fiemap_extent_info *fieinfo, u64 start,
124                             u64 len)
125 {
126         return -EIO;
127 }
128 
129 static int bad_inode_update_time(struct inode *inode, struct timespec64 *time,
130                                  int flags)
131 {
132         return -EIO;
133 }
134 
135 static int bad_inode_atomic_open(struct inode *inode, struct dentry *dentry,
136                                  struct file *file, unsigned int open_flag,
137                                  umode_t create_mode)
138 {
139         return -EIO;
140 }
141 
142 static int bad_inode_tmpfile(struct inode *inode, struct dentry *dentry,
143                              umode_t mode)
144 {
145         return -EIO;
146 }
147 
148 static int bad_inode_set_acl(struct inode *inode, struct posix_acl *acl,
149                              int type)
150 {
151         return -EIO;
152 }
153 
154 static const struct inode_operations bad_inode_ops =
155 {
156         .create         = bad_inode_create,
157         .lookup         = bad_inode_lookup,
158         .link           = bad_inode_link,
159         .unlink         = bad_inode_unlink,
160         .symlink        = bad_inode_symlink,
161         .mkdir          = bad_inode_mkdir,
162         .rmdir          = bad_inode_rmdir,
163         .mknod          = bad_inode_mknod,
164         .rename         = bad_inode_rename2,
165         .readlink       = bad_inode_readlink,
166         .permission     = bad_inode_permission,
167         .getattr        = bad_inode_getattr,
168         .setattr        = bad_inode_setattr,
169         .listxattr      = bad_inode_listxattr,
170         .get_link       = bad_inode_get_link,
171         .get_acl        = bad_inode_get_acl,
172         .fiemap         = bad_inode_fiemap,
173         .update_time    = bad_inode_update_time,
174         .atomic_open    = bad_inode_atomic_open,
175         .tmpfile        = bad_inode_tmpfile,
176         .set_acl        = bad_inode_set_acl,
177 };
178 
179 
180 /*
181  * When a filesystem is unable to read an inode due to an I/O error in
182  * its read_inode() function, it can call make_bad_inode() to return a
183  * set of stubs which will return EIO errors as required. 
184  *
185  * We only need to do limited initialisation: all other fields are
186  * preinitialised to zero automatically.
187  */
188  
189 /**
190  *      make_bad_inode - mark an inode bad due to an I/O error
191  *      @inode: Inode to mark bad
192  *
193  *      When an inode cannot be read due to a media or remote network
194  *      failure this function makes the inode "bad" and causes I/O operations
195  *      on it to fail from this point on.
196  */
197  
198 void make_bad_inode(struct inode *inode)
199 {
200         remove_inode_hash(inode);
201 
202         inode->i_mode = S_IFREG;
203         inode->i_atime = inode->i_mtime = inode->i_ctime =
204                 current_time(inode);
205         inode->i_op = &bad_inode_ops;   
206         inode->i_opflags &= ~IOP_XATTR;
207         inode->i_fop = &bad_file_ops;   
208 }
209 EXPORT_SYMBOL(make_bad_inode);
210 
211 /*
212  * This tests whether an inode has been flagged as bad. The test uses
213  * &bad_inode_ops to cover the case of invalidated inodes as well as
214  * those created by make_bad_inode() above.
215  */
216  
217 /**
218  *      is_bad_inode - is an inode errored
219  *      @inode: inode to test
220  *
221  *      Returns true if the inode in question has been marked as bad.
222  */
223  
224 bool is_bad_inode(struct inode *inode)
225 {
226         return (inode->i_op == &bad_inode_ops); 
227 }
228 
229 EXPORT_SYMBOL(is_bad_inode);
230 
231 /**
232  * iget_failed - Mark an under-construction inode as dead and release it
233  * @inode: The inode to discard
234  *
235  * Mark an under-construction inode as dead and release it.
236  */
237 void iget_failed(struct inode *inode)
238 {
239         make_bad_inode(inode);
240         unlock_new_inode(inode);
241         iput(inode);
242 }
243 EXPORT_SYMBOL(iget_failed);
244 

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