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TOMOYO Linux Cross Reference
Linux/fs/nilfs2/ifile.c

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  1 /*
  2  * ifile.c - NILFS inode file
  3  *
  4  * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License as published by
  8  * the Free Software Foundation; either version 2 of the License, or
  9  * (at your option) any later version.
 10  *
 11  * This program is distributed in the hope that it will be useful,
 12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14  * GNU General Public License for more details.
 15  *
 16  * You should have received a copy of the GNU General Public License
 17  * along with this program; if not, write to the Free Software
 18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 19  *
 20  * Written by Amagai Yoshiji <amagai@osrg.net>.
 21  * Revised by Ryusuke Konishi <ryusuke@osrg.net>.
 22  *
 23  */
 24 
 25 #include <linux/types.h>
 26 #include <linux/buffer_head.h>
 27 #include "nilfs.h"
 28 #include "mdt.h"
 29 #include "alloc.h"
 30 #include "ifile.h"
 31 
 32 
 33 struct nilfs_ifile_info {
 34         struct nilfs_mdt_info mi;
 35         struct nilfs_palloc_cache palloc_cache;
 36 };
 37 
 38 static inline struct nilfs_ifile_info *NILFS_IFILE_I(struct inode *ifile)
 39 {
 40         return (struct nilfs_ifile_info *)NILFS_MDT(ifile);
 41 }
 42 
 43 /**
 44  * nilfs_ifile_create_inode - create a new disk inode
 45  * @ifile: ifile inode
 46  * @out_ino: pointer to a variable to store inode number
 47  * @out_bh: buffer_head contains newly allocated disk inode
 48  *
 49  * Return Value: On success, 0 is returned and the newly allocated inode
 50  * number is stored in the place pointed by @ino, and buffer_head pointer
 51  * that contains newly allocated disk inode structure is stored in the
 52  * place pointed by @out_bh
 53  * On error, one of the following negative error codes is returned.
 54  *
 55  * %-EIO - I/O error.
 56  *
 57  * %-ENOMEM - Insufficient amount of memory available.
 58  *
 59  * %-ENOSPC - No inode left.
 60  */
 61 int nilfs_ifile_create_inode(struct inode *ifile, ino_t *out_ino,
 62                              struct buffer_head **out_bh)
 63 {
 64         struct nilfs_palloc_req req;
 65         int ret;
 66 
 67         req.pr_entry_nr = 0;  /* 0 says find free inode from beginning of
 68                                  a group. dull code!! */
 69         req.pr_entry_bh = NULL;
 70 
 71         ret = nilfs_palloc_prepare_alloc_entry(ifile, &req);
 72         if (!ret) {
 73                 ret = nilfs_palloc_get_entry_block(ifile, req.pr_entry_nr, 1,
 74                                                    &req.pr_entry_bh);
 75                 if (ret < 0)
 76                         nilfs_palloc_abort_alloc_entry(ifile, &req);
 77         }
 78         if (ret < 0) {
 79                 brelse(req.pr_entry_bh);
 80                 return ret;
 81         }
 82         nilfs_palloc_commit_alloc_entry(ifile, &req);
 83         nilfs_mdt_mark_buffer_dirty(req.pr_entry_bh);
 84         nilfs_mdt_mark_dirty(ifile);
 85         *out_ino = (ino_t)req.pr_entry_nr;
 86         *out_bh = req.pr_entry_bh;
 87         return 0;
 88 }
 89 
 90 /**
 91  * nilfs_ifile_delete_inode - delete a disk inode
 92  * @ifile: ifile inode
 93  * @ino: inode number
 94  *
 95  * Return Value: On success, 0 is returned. On error, one of the following
 96  * negative error codes is returned.
 97  *
 98  * %-EIO - I/O error.
 99  *
100  * %-ENOMEM - Insufficient amount of memory available.
101  *
102  * %-ENOENT - The inode number @ino have not been allocated.
103  */
104 int nilfs_ifile_delete_inode(struct inode *ifile, ino_t ino)
105 {
106         struct nilfs_palloc_req req = {
107                 .pr_entry_nr = ino, .pr_entry_bh = NULL
108         };
109         struct nilfs_inode *raw_inode;
110         void *kaddr;
111         int ret;
112 
113         ret = nilfs_palloc_prepare_free_entry(ifile, &req);
114         if (!ret) {
115                 ret = nilfs_palloc_get_entry_block(ifile, req.pr_entry_nr, 0,
116                                                    &req.pr_entry_bh);
117                 if (ret < 0)
118                         nilfs_palloc_abort_free_entry(ifile, &req);
119         }
120         if (ret < 0) {
121                 brelse(req.pr_entry_bh);
122                 return ret;
123         }
124 
125         kaddr = kmap_atomic(req.pr_entry_bh->b_page, KM_USER0);
126         raw_inode = nilfs_palloc_block_get_entry(ifile, req.pr_entry_nr,
127                                                  req.pr_entry_bh, kaddr);
128         raw_inode->i_flags = 0;
129         kunmap_atomic(kaddr, KM_USER0);
130 
131         nilfs_mdt_mark_buffer_dirty(req.pr_entry_bh);
132         brelse(req.pr_entry_bh);
133 
134         nilfs_palloc_commit_free_entry(ifile, &req);
135 
136         return 0;
137 }
138 
139 int nilfs_ifile_get_inode_block(struct inode *ifile, ino_t ino,
140                                 struct buffer_head **out_bh)
141 {
142         struct super_block *sb = ifile->i_sb;
143         int err;
144 
145         if (unlikely(!NILFS_VALID_INODE(sb, ino))) {
146                 nilfs_error(sb, __func__, "bad inode number: %lu",
147                             (unsigned long) ino);
148                 return -EINVAL;
149         }
150 
151         err = nilfs_palloc_get_entry_block(ifile, ino, 0, out_bh);
152         if (unlikely(err))
153                 nilfs_warning(sb, __func__, "unable to read inode: %lu",
154                               (unsigned long) ino);
155         return err;
156 }
157 
158 /**
159  * nilfs_ifile_read - read or get ifile inode
160  * @sb: super block instance
161  * @root: root object
162  * @inode_size: size of an inode
163  * @raw_inode: on-disk ifile inode
164  * @inodep: buffer to store the inode
165  */
166 int nilfs_ifile_read(struct super_block *sb, struct nilfs_root *root,
167                      size_t inode_size, struct nilfs_inode *raw_inode,
168                      struct inode **inodep)
169 {
170         struct inode *ifile;
171         int err;
172 
173         ifile = nilfs_iget_locked(sb, root, NILFS_IFILE_INO);
174         if (unlikely(!ifile))
175                 return -ENOMEM;
176         if (!(ifile->i_state & I_NEW))
177                 goto out;
178 
179         err = nilfs_mdt_init(ifile, NILFS_MDT_GFP,
180                              sizeof(struct nilfs_ifile_info));
181         if (err)
182                 goto failed;
183 
184         err = nilfs_palloc_init_blockgroup(ifile, inode_size);
185         if (err)
186                 goto failed;
187 
188         nilfs_palloc_setup_cache(ifile, &NILFS_IFILE_I(ifile)->palloc_cache);
189 
190         err = nilfs_read_inode_common(ifile, raw_inode);
191         if (err)
192                 goto failed;
193 
194         unlock_new_inode(ifile);
195  out:
196         *inodep = ifile;
197         return 0;
198  failed:
199         iget_failed(ifile);
200         return err;
201 }
202 

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