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1.1 root 1: /*
2: * linux/fs/ext/inode.c
3: *
4: * (C) 1992 Remy Card ([email protected])
5: *
6: * from
7: *
8: * linux/fs/minix/inode.c
9: *
10: * (C) 1991 Linus Torvalds
11: */
12:
13: #include <linux/string.h>
14: #include <linux/stat.h>
15: #include <linux/sched.h>
16: #include <linux/ext_fs.h>
17: #include <linux/kernel.h>
18: #include <linux/mm.h>
19: #include <asm/system.h>
20: #include <asm/segment.h>
21:
22: int sync_dev(int dev);
23:
24: void ext_put_inode(struct inode *inode)
25: {
26: inode->i_size = 0;
27: ext_truncate(inode);
28: ext_free_inode(inode);
29: }
30:
31: void ext_put_super(struct super_block *sb)
32: {
33: #ifdef EXTFS_BITMAP
34: int i;
35: #endif
36:
37: lock_super(sb);
38: sb->s_dev = 0;
39: #ifdef EXTFS_BITMAP
40: for(i = 0 ; i < EXT_I_MAP_SLOTS ; i++)
41: brelse(sb->s_imap[i]);
42: for(i = 0 ; i < EXT_Z_MAP_SLOTS ; i++)
43: brelse(sb->s_zmap[i]);
44: #endif
45: #ifdef EXTFS_FREELIST
46: if (sb->s_imap[1])
47: brelse (sb->s_imap[1]);
48: if (sb->s_zmap[1])
49: brelse (sb->s_zmap[1]);
50: #endif
51: free_super(sb);
52: return;
53: }
54:
55: static struct super_operations ext_sops = {
56: ext_read_inode,
57: ext_write_inode,
58: ext_put_inode,
59: ext_put_super,
60: ext_write_super,
61: ext_statfs
62: };
63:
64: struct super_block *ext_read_super(struct super_block *s,void *data)
65: {
66: struct buffer_head *bh;
67: struct ext_super_block *es;
68: int dev=s->s_dev,block;
69: #ifdef EXTFS_BITMAP
70: int i;
71: #endif
72:
73: lock_super(s);
74: if (!(bh = bread(dev,1))) {
75: s->s_dev=0;
76: free_super(s);
77: printk("bread failed\n");
78: return NULL;
79: }
80: /* *((struct ext_super_block *) s) =
81: *((struct ext_super_block *) bh->b_data); */
82: es = (struct ext_super_block *) bh->b_data;
83: s->s_ninodes = es->s_ninodes;
84: s->s_nzones = es->s_nzones;
85: #ifdef EXTFS_BITMAP
86: s->s_imap_blocks = es->s_imap_blocks;
87: s->s_zmap_blocks = es->s_zmap_blocks;
88: #endif
89: s->s_firstdatazone = es->s_firstdatazone;
90: s->s_log_zone_size = es->s_log_zone_size;
91: s->s_max_size = es->s_max_size;
92: s->s_magic = es->s_magic;
93: #ifdef EXTFS_FREELIST
94: s->s_zmap[0] = (struct buffer_head *) es->s_firstfreeblock;
95: s->s_zmap[2] = (struct buffer_head *) es->s_freeblockscount;
96: s->s_imap[0] = (struct buffer_head *) es->s_firstfreeinode;
97: s->s_imap[2] = (struct buffer_head *) es->s_freeinodescount;
98: #endif
99: brelse(bh);
100: if (s->s_magic != EXT_SUPER_MAGIC) {
101: s->s_dev = 0;
102: free_super(s);
103: printk("magic match failed\n");
104: return NULL;
105: }
106: #ifdef EXTFS_BITMAP
107: for (i=0;i < EXT_I_MAP_SLOTS;i++)
108: s->s_imap[i] = NULL;
109: for (i=0;i < EXT_Z_MAP_SLOTS;i++)
110: s->s_zmap[i] = NULL;
111: block=2;
112: for (i=0 ; i < s->s_imap_blocks ; i++)
113: if (s->s_imap[i]=bread(dev,block))
114: block++;
115: else
116: break;
117: for (i=0 ; i < s->s_zmap_blocks ; i++)
118: if (s->s_zmap[i]=bread(dev,block))
119: block++;
120: else
121: break;
122: if (block != 2+s->s_imap_blocks+s->s_zmap_blocks) {
123: for(i=0;i<EXT_I_MAP_SLOTS;i++)
124: brelse(s->s_imap[i]);
125: for(i=0;i<EXT_Z_MAP_SLOTS;i++)
126: brelse(s->s_zmap[i]);
127: s->s_dev=0;
128: free_super(s);
129: printk("block failed\n");
130: return NULL;
131: }
132: s->s_imap[0]->b_data[0] |= 1;
133: s->s_zmap[0]->b_data[0] |= 1;
134: #endif
135: #ifdef EXTFS_FREELIST
136: if (!s->s_zmap[0])
137: s->s_zmap[1] = NULL;
138: else
139: if (!(s->s_zmap[1] = bread (dev, (unsigned long) s->s_zmap[0]))) {
140: printk ("ext_read_super: unable to read first free block\n");
141: s->s_dev = 0;
142: free_super(s);
143: return NULL;
144: }
145: if (!s->s_imap[0])
146: s->s_imap[1] = NULL;
147: else {
148: block = 2 + (((unsigned long) s->s_imap[0]) - 1) / EXT_INODES_PER_BLOCK;
149: if (!(s->s_imap[1] = bread (dev, block))) {
150: printk ("ext_read_super: unable to read first free inode block\n");
151: brelse(s->s_zmap[1]);
152: s->s_dev = 0;
153: free_super (s);
154: return NULL;
155: }
156: }
157: #endif
158:
159: free_super(s);
160: /* set up enough so that it can read an inode */
161: s->s_dev = dev;
162: s->s_op = &ext_sops;
163: if (!(s->s_mounted = iget(dev,EXT_ROOT_INO))) {
164: s->s_dev=0;
165: printk("get root inode failed\n");
166: return NULL;
167: }
168: return s;
169: }
170:
171: void ext_write_super (struct super_block *sb)
172: {
173: #ifdef EXTFS_FREELIST
174: struct buffer_head * bh;
175: struct ext_super_block * es;
176:
177: #ifdef EXTFS_DEBUG
178: printk ("ext_write_super called\n");
179: #endif
180: if (!(bh = bread (sb->s_dev, 1))) {
181: printk ("ext_write_super: bread failed\n");
182: return;
183: }
184: es = (struct ext_super_block *) bh->b_data;
185: es->s_firstfreeblock = (unsigned long) sb->s_zmap[0];
186: es->s_freeblockscount = (unsigned long) sb->s_zmap[2];
187: es->s_firstfreeinode = (unsigned long) sb->s_imap[0];
188: es->s_freeinodescount = (unsigned long) sb->s_imap[2];
189: bh->b_dirt = 1;
190: brelse (bh);
191: sb->s_dirt = 0;
192: #endif
193: }
194:
195: void ext_statfs (struct super_block *sb, struct statfs *buf)
196: {
197: long tmp;
198:
199: put_fs_long(EXT_SUPER_MAGIC, &buf->f_type);
200: put_fs_long(1024, &buf->f_bsize);
201: put_fs_long(sb->s_nzones << sb->s_log_zone_size, &buf->f_blocks);
202: tmp = ext_count_free_blocks(sb);
203: put_fs_long(tmp, &buf->f_bfree);
204: put_fs_long(tmp, &buf->f_bavail);
205: put_fs_long(sb->s_ninodes, &buf->f_files);
206: put_fs_long(ext_count_free_inodes(sb), &buf->f_ffree);
207: /* Don't know what value to put in buf->f_fsid */
208: }
209:
210: static int _ext_bmap(struct inode * inode,int block,int create)
211: {
212: struct buffer_head * bh;
213: int i;
214:
215: if (block<0) {
216: printk("_ext_bmap: block<0");
217: return 0;
218: }
219: if (block >= 9+256+256*256+256*256*256) {
220: printk("_ext_bmap: block>big");
221: return 0;
222: }
223: if (block<9) {
224: if (create && !inode->i_data[block])
225: if (inode->i_data[block]=ext_new_block(inode->i_dev)) {
226: inode->i_ctime=CURRENT_TIME;
227: inode->i_dirt=1;
228: }
229: return inode->i_data[block];
230: }
231: block -= 9;
232: if (block<256) {
233: if (create && !inode->i_data[9])
234: if (inode->i_data[9]=ext_new_block(inode->i_dev)) {
235: inode->i_dirt=1;
236: inode->i_ctime=CURRENT_TIME;
237: }
238: if (!inode->i_data[9])
239: return 0;
240: if (!(bh = bread(inode->i_dev,inode->i_data[9])))
241: return 0;
242: i = ((unsigned long *) (bh->b_data))[block];
243: if (create && !i)
244: if (i=ext_new_block(inode->i_dev)) {
245: ((unsigned long *) (bh->b_data))[block]=i;
246: bh->b_dirt=1;
247: }
248: brelse(bh);
249: return i;
250: }
251: block -= 256;
252: if (block<256*256) {
253: if (create && !inode->i_data[10])
254: if (inode->i_data[10]=ext_new_block(inode->i_dev)) {
255: inode->i_dirt=1;
256: inode->i_ctime=CURRENT_TIME;
257: }
258: if (!inode->i_data[10])
259: return 0;
260: if (!(bh=bread(inode->i_dev,inode->i_data[10])))
261: return 0;
262: i = ((unsigned long *)bh->b_data)[block>>8];
263: if (create && !i)
264: if (i=ext_new_block(inode->i_dev)) {
265: ((unsigned long *) (bh->b_data))[block>>8]=i;
266: bh->b_dirt=1;
267: }
268: brelse(bh);
269: if (!i)
270: return 0;
271: if (!(bh=bread(inode->i_dev,i)))
272: return 0;
273: i = ((unsigned long *)bh->b_data)[block&255];
274: if (create && !i)
275: if (i=ext_new_block(inode->i_dev)) {
276: ((unsigned long *) (bh->b_data))[block&255]=i;
277: bh->b_dirt=1;
278: }
279: brelse(bh);
280: return i;
281: }
282: printk("ext_bmap: triple indirection not yet implemented\n");
283: return 0;
284: }
285:
286: int ext_bmap(struct inode * inode,int block)
287: {
288: return _ext_bmap(inode,block,0);
289: }
290:
291: int ext_create_block(struct inode * inode, int block)
292: {
293: return _ext_bmap(inode,block,1);
294: }
295:
296: void ext_read_inode(struct inode * inode)
297: {
298: struct buffer_head * bh;
299: struct ext_inode * raw_inode;
300: int block;
301:
302: #ifdef EXTFS_BITMAP
303: block = 2 + inode->i_sb->s_imap_blocks + inode->i_sb->s_zmap_blocks +
304: (inode->i_ino-1)/EXT_INODES_PER_BLOCK;
305: #endif
306: #ifdef EXTFS_FREELIST
307: block = 2 + (inode->i_ino-1)/EXT_INODES_PER_BLOCK;
308: #endif
309: if (!(bh=bread(inode->i_dev,block)))
310: panic("unable to read i-node block");
311: raw_inode = ((struct ext_inode *) bh->b_data) +
312: (inode->i_ino-1)%EXT_INODES_PER_BLOCK;
313: inode->i_mode = raw_inode->i_mode;
314: inode->i_uid = raw_inode->i_uid;
315: inode->i_gid = raw_inode->i_gid;
316: inode->i_nlink = raw_inode->i_nlinks;
317: inode->i_size = raw_inode->i_size;
318: inode->i_mtime = inode->i_atime = inode->i_ctime = raw_inode->i_time;
319: if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
320: inode->i_rdev = raw_inode->i_zone[0];
321: else for (block = 0; block < 12; block++)
322: inode->i_data[block] = raw_inode->i_zone[block];
323: brelse(bh);
324: inode->i_op = NULL;
325: if (S_ISREG(inode->i_mode))
326: inode->i_op = &ext_file_inode_operations;
327: else if (S_ISDIR(inode->i_mode))
328: inode->i_op = &ext_dir_inode_operations;
329: else if (S_ISLNK(inode->i_mode))
330: inode->i_op = &ext_symlink_inode_operations;
331: else if (S_ISCHR(inode->i_mode))
332: inode->i_op = &ext_chrdev_inode_operations;
333: else if (S_ISBLK(inode->i_mode))
334: inode->i_op = &ext_blkdev_inode_operations;
335: else if (S_ISFIFO(inode->i_mode)) {
336: inode->i_op = &ext_fifo_inode_operations;
337: inode->i_size = 0;
338: inode->i_pipe = 1;
339: PIPE_HEAD(*inode) = PIPE_TAIL(*inode) = 0;
340: PIPE_READERS(*inode) = PIPE_WRITERS(*inode) = 0;
341: }
342: }
343:
344: void ext_write_inode(struct inode * inode)
345: {
346: struct buffer_head * bh;
347: struct ext_inode * raw_inode;
348: int block;
349:
350: #ifdef EXTFS_BITMAP
351: block = 2 + inode->i_sb->s_imap_blocks + inode->i_sb->s_zmap_blocks +
352: (inode->i_ino-1)/EXT_INODES_PER_BLOCK;
353: #endif
354: #ifdef EXTFS_FREELIST
355: block = 2 + (inode->i_ino-1)/EXT_INODES_PER_BLOCK;
356: #endif
357: if (!(bh=bread(inode->i_dev,block)))
358: panic("unable to read i-node block");
359: raw_inode = ((struct ext_inode *)bh->b_data) +
360: (inode->i_ino-1)%EXT_INODES_PER_BLOCK;
361: raw_inode->i_mode = inode->i_mode;
362: raw_inode->i_uid = inode->i_uid;
363: raw_inode->i_gid = inode->i_gid;
364: raw_inode->i_nlinks = inode->i_nlink;
365: raw_inode->i_size = inode->i_size;
366: raw_inode->i_time = inode->i_mtime;
367: if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
368: raw_inode->i_zone[0] = inode->i_rdev;
369: else for (block = 0; block < 12; block++)
370: raw_inode->i_zone[block] = inode->i_data[block];
371: bh->b_dirt=1;
372: inode->i_dirt=0;
373: brelse(bh);
374: }
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