1 /* object based disk file system
3 * This software is licensed under the GPL. See the file COPYING in the
4 * top directory of this distribution for details.
6 * Copyright (C), 1999, Stelias Computing Inc
14 #include <linux/obd_class.h>
15 #include <linux/list.h>
20 struct list_head rq_plist; /* linked list of req's */
21 unsigned long rq_jiffies;
22 struct page *rq_page; /* page to be written */
25 struct list_head obdfs_super_list; /* list of all OBDFS superblocks */
27 struct obdfs_sb_info {
28 struct list_head osi_list; /* list of supers */
29 struct obd_conn osi_conn;
30 struct super_block *osi_super;
31 struct obd_device *osi_obd;
32 struct obd_ops *osi_ops;
33 ino_t osi_rootino; /* number of root inode */
34 int osi_minor; /* minor of /dev/obdX */
35 struct list_head osi_inodes; /* list of dirty inodes */
36 unsigned long osi_cache_count;
37 struct semaphore osi_list_mutex;
40 struct obdfs_inode_info {
42 struct list_head oi_inodes;
43 struct list_head oi_pages;
44 char oi_inline[OBD_INLINESZ];
48 #define EXT2_DIR_PAD 4
49 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1)
50 #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \
52 #define EXT2_NAME_LEN 255
53 struct ext2_dir_entry_2 {
54 __u32 inode; /* Inode number */
55 __u16 rec_len; /* Directory entry length */
56 __u8 name_len; /* Name length */
58 char name[EXT2_NAME_LEN]; /* File name */
60 int obdfs_check_dir_entry (const char * function, struct inode * dir,
61 struct ext2_dir_entry_2 * de, struct page * page,
62 unsigned long offset);
63 extern struct file_operations obdfs_dir_operations;
64 extern struct inode_operations obdfs_dir_inode_operations;
67 extern struct file_operations obdfs_file_operations;
68 extern struct inode_operations obdfs_file_inode_operations;
71 void obdfs_dequeue_pages(struct inode *inode);
72 int obdfs_flushd_init(void);
73 int obdfs_flushd_cleanup(void);
74 int obdfs_flush_reqs(struct list_head *inode_list, unsigned long check_time);
75 int obdfs_flush_dirty_pages(unsigned long check_time);
79 * Structure of the super block
81 struct ext2_super_block {
82 __u32 s_inodes_count; /* Inodes count */
83 __u32 s_blocks_count; /* Blocks count */
84 __u32 s_r_blocks_count; /* Reserved blocks count */
85 __u32 s_free_blocks_count; /* Free blocks count */
86 __u32 s_free_inodes_count; /* Free inodes count */
87 __u32 s_first_data_block; /* First Data Block */
88 __u32 s_log_block_size; /* Block size */
89 __s32 s_log_frag_size; /* Fragment size */
90 __u32 s_blocks_per_group; /* # Blocks per group */
91 __u32 s_frags_per_group; /* # Fragments per group */
92 __u32 s_inodes_per_group; /* # Inodes per group */
93 __u32 s_mtime; /* Mount time */
94 __u32 s_wtime; /* Write time */
95 __u16 s_mnt_count; /* Mount count */
96 __s16 s_max_mnt_count; /* Maximal mount count */
97 __u16 s_magic; /* Magic signature */
98 __u16 s_state; /* File system state */
99 __u16 s_errors; /* Behaviour when detecting errors */
100 __u16 s_minor_rev_level; /* minor revision level */
101 __u32 s_lastcheck; /* time of last check */
102 __u32 s_checkinterval; /* max. time between checks */
103 __u32 s_creator_os; /* OS */
104 __u32 s_rev_level; /* Revision level */
105 __u16 s_def_resuid; /* Default uid for reserved blocks */
106 __u16 s_def_resgid; /* Default gid for reserved blocks */
108 * These fields are for EXT2_DYNAMIC_REV superblocks only.
110 * Note: the difference between the compatible feature set and
111 * the incompatible feature set is that if there is a bit set
112 * in the incompatible feature set that the kernel doesn't
113 * know about, it should refuse to mount the filesystem.
115 * e2fsck's requirements are more strict; if it doesn't know
116 * about a feature in either the compatible or incompatible
117 * feature set, it must abort and not try to meddle with
118 * things it doesn't understand...
120 __u32 s_first_ino; /* First non-reserved inode */
121 __u16 s_inode_size; /* size of inode structure */
122 __u16 s_block_group_nr; /* block group # of this superblock */
123 __u32 s_feature_compat; /* compatible feature set */
124 __u32 s_feature_incompat; /* incompatible feature set */
125 __u32 s_feature_ro_compat; /* readonly-compatible feature set */
126 __u8 s_uuid[16]; /* 128-bit uuid for volume */
127 char s_volume_name[16]; /* volume name */
128 char s_last_mounted[64]; /* directory where last mounted */
129 __u32 s_algorithm_usage_bitmap; /* For compression */
131 * Performance hints. Directory preallocation should only
132 * happen if the EXT2_COMPAT_PREALLOC flag is on.
134 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
135 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
137 __u32 s_reserved[204]; /* Padding to the end of the block */
140 #define EXT2_SB(sb) (&((sb)->u.ext2_sb))
142 * Maximal count of links to a file
144 #define EXT2_LINK_MAX 32000
146 * Ext2 directory file types. Only the low 3 bits are used. The
147 * other bits are reserved for now.
149 #define EXT2_FT_UNKNOWN 0
150 #define EXT2_FT_REG_FILE 1
151 #define EXT2_FT_DIR 2
152 #define EXT2_FT_CHRDEV 3
153 #define EXT2_FT_BLKDEV 4
154 #define EXT2_FT_FIFO 5
155 #define EXT2_FT_SOCK 6
156 #define EXT2_FT_SYMLINK 7
158 #define EXT2_FT_MAX 8
160 #define EXT2_BTREE_FL 0x00001000 /* btree format dir */
161 #define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
162 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
163 #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \
164 ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
165 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \
166 ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
169 struct dentry *obdfs_lookup(struct inode * dir, struct dentry *dentry);
170 int obdfs_create (struct inode * dir, struct dentry * dentry, int mode);
171 int obdfs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
172 int obdfs_rmdir(struct inode *dir, struct dentry *dentry);
173 int obdfs_unlink(struct inode *dir, struct dentry *dentry);
174 int obdfs_mknod(struct inode *dir, struct dentry *dentry, int mode, int rdev);
175 int obdfs_symlink(struct inode *dir, struct dentry *dentry,
176 const char *symname);
177 int obdfs_link(struct dentry *old_dentry, struct inode *dir,
178 struct dentry *dentry);
179 int obdfs_rename(struct inode *old_dir, struct dentry *old_dentry,
180 struct inode *new_dir, struct dentry *new_dentry);
183 int obdfs_do_writepage(struct page *, int sync);
184 int obdfs_init_pgrqcache(void);
185 void obdfs_cleanup_pgrqcache(void);
186 inline void obdfs_pgrq_del(struct obdfs_pgrq *pgrq);
187 int obdfs_readpage(struct file *file, struct page *page);
188 int obdfs_writepage(struct page *page);
189 struct page *obdfs_getpage(struct inode *inode, unsigned long offset,
190 int create, int locked);
191 int obdfs_write_one_page(struct file *file, struct page *page,
192 unsigned long offset, unsigned long bytes,
194 int obdfs_do_vec_wr(struct inode **inodes, obd_count num_io, obd_count num_oa,
195 struct obdo **obdos, obd_count *oa_bufs,
196 struct page **pages, char **bufs, obd_size *counts,
197 obd_off *offsets, obd_flag *flags);
198 void obdfs_truncate(struct inode *inode);
201 extern long obdfs_cache_count;
202 extern long obdfs_mutex_start;
205 extern struct inode_operations obdfs_fast_symlink_inode_operations;
206 extern struct inode_operations obdfs_symlink_inode_operations;
209 void obdfs_sysctl_init(void);
210 void obdfs_sysctl_clean(void);
213 static inline struct obdfs_inode_info *obdfs_i2info(struct inode *inode)
215 return (struct obdfs_inode_info *)&(inode->u.generic_ip);
218 static inline struct obdfs_sb_info *obdfs_i2sbi(struct inode *inode)
220 return (struct obdfs_sb_info *) &(inode->i_sb->u.generic_sbp);
223 static inline struct list_head *obdfs_iplist(struct inode *inode)
225 struct obdfs_inode_info *info = obdfs_i2info(inode);
227 return &info->oi_pages;
230 static inline struct list_head *obdfs_islist(struct inode *inode)
232 struct obdfs_inode_info *info = obdfs_i2info(inode);
234 return &info->oi_inodes;
237 static inline struct list_head *obdfs_slist(struct inode *inode)
239 struct obdfs_sb_info *sbi = obdfs_i2sbi(inode);
241 return &sbi->osi_inodes;
244 #define obd_down(mutex) { \
245 /* CDEBUG(D_INFO, "get lock\n"); */ \
246 obdfs_mutex_start = jiffies; \
248 if (jiffies - obdfs_mutex_start) \
249 CDEBUG(D_CACHE, "waited on mutex %ld jiffies\n", \
250 jiffies - obdfs_mutex_start); \
253 #define obd_up(mutex) { \
255 if (jiffies - obdfs_mutex_start > 1) \
256 CDEBUG(D_CACHE, "held mutex for %ld jiffies\n", \
257 jiffies - obdfs_mutex_start); \
258 /* CDEBUG(D_INFO, "free lock\n"); */ \
261 /* We track if a page has been added to the OBD page cache by stting a
262 * flag on the page. We have chosen a bit that will hopefully not be
265 #define PG_obdcache 29
266 #define OBDAddCachePage(page) test_and_set_bit(PG_obdcache, &(page)->flags)
267 #define OBDClearCachePage(page) clear_bit(PG_obdcache, &(page)->flags)
269 static inline void obdfs_print_plist(struct inode *inode)
271 struct list_head *page_list = obdfs_iplist(inode);
272 struct list_head *tmp;
274 CDEBUG(D_INFO, "inode %ld: page", inode->i_ino);
275 /* obd_down(&obdfs_i2sbi(inode)->osi_list_mutex); */
276 if (list_empty(page_list)) {
277 CDEBUG(D_INFO, " list empty\n");
278 obd_up(&obdfs_i2sbi(inode)->osi_list_mutex);
283 while ( (tmp = tmp->next) != page_list) {
284 struct obdfs_pgrq *pgrq;
285 pgrq = list_entry(tmp, struct obdfs_pgrq, rq_plist);
286 CDEBUG(D_INFO, " %p", pgrq->rq_page);
288 CDEBUG(D_INFO, "\n");
289 /* obd_up(&obdfs_i2sbi(inode)->osi_list_mutex); */
292 static inline int obdfs_has_inline(struct inode *inode)
294 return (obdfs_i2info(inode)->oi_flags & OBD_FL_INLINEDATA);
297 static void inline obdfs_from_inode(struct obdo *oa, struct inode *inode)
299 struct obdfs_inode_info *oinfo = obdfs_i2info(inode);
301 CDEBUG(D_INFO, "src inode %ld, dst obdo %ld valid 0x%08x\n",
302 inode->i_ino, (long)oa->o_id, oa->o_valid);
303 obdo_from_inode(oa, inode);
304 if (obdfs_has_inline(inode)) {
305 CDEBUG(D_INODE, "copying inline data from inode to obdo\n");
306 memcpy(oa->o_inline, oinfo->oi_inline, OBD_INLINESZ);
307 oa->o_obdflags |= OBD_FL_INLINEDATA;
308 oa->o_valid |= OBD_MD_FLINLINE;
310 } /* obdfs_from_inode */
312 static void inline obdfs_to_inode(struct inode *inode, struct obdo *oa)
314 struct obdfs_inode_info *oinfo = obdfs_i2info(inode);
316 CDEBUG(D_INFO, "src obdo %ld valid 0x%08x, dst inode %ld\n",
317 (long)oa->o_id, oa->o_valid, inode->i_ino);
319 obdo_to_inode(inode, oa);
321 if (obdo_has_inline(oa)) {
322 CDEBUG(D_INODE, "copying inline data from obdo to inode\n");
323 memcpy(oinfo->oi_inline, oa->o_inline, OBD_INLINESZ);
324 oinfo->oi_flags |= OBD_FL_INLINEDATA;
326 } /* obdfs_to_inode */
332 #warning "*** WARNING redefining OPS"
334 #define OPS(sb,op) ((struct obdfs_sb_info *)(& ## sb ## ->u.generic_sbp))->osi_ops->o_ ## op
335 #define IOPS(inode,op) ((struct obdfs_sb_info *)(& ## inode->i_sb ## ->u.generic_sbp))->osi_ops->o_ ## op
339 #warning "*** WARNING redefining ID"
341 #define ID(sb) (&((struct obdfs_sb_info *)( & ## sb ## ->u.generic_sbp))->osi_conn)
342 #define IID(inode) (&((struct obdfs_sb_info *)( & ## inode->i_sb ## ->u.generic_sbp))->osi_conn)
345 #define OBDFS_SUPER_MAGIC 0x4711