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Linux/fs/bad_inode.c

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

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