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[/] [or1k_old/] [trunk/] [rc203soc/] [sw/] [uClinux/] [fs/] [ext2/] [fsync.c] - Blame information for rev 1628

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1 1628 jcastillo 
/*
2 
 *  linux/fs/ext2/fsync.c
3 
 *
4 
 *  Copyright (C) 1993  Stephen Tweedie (sct@dcs.ed.ac.uk)
5 
 *  from
6 
 *  Copyright (C) 1992  Remy Card (card@masi.ibp.fr)
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 *                      Laboratoire MASI - Institut Blaise Pascal
8 
 *                      Universite Pierre et Marie Curie (Paris VI)
9 
 *  from
10 
 *  linux/fs/minix/truncate.c   Copyright (C) 1991, 1992  Linus Torvalds
11 
 *
12 
 *  ext2fs fsync primitive
13 
 *
14 
 *  Big-endian to little-endian byte-swapping/bitmaps by
15 
 *        David S. Miller (davem@caip.rutgers.edu), 1995
16 
 *
17 
 *  Fast 'fsync' on large files (Scott Laird <laird@pacificrim.net>)
18 
 */
19 
 
20 
#include <asm/segment.h>
21 
#include <asm/system.h>
22 
 
23 
#include <linux/errno.h>
24 
#include <linux/fs.h>
25 
#include <linux/ext2_fs.h>
26 
#include <linux/fcntl.h>
27 
#include <linux/sched.h>
28 
#include <linux/stat.h>
29 
#include <linux/locks.h>
30 
 
31 
 
32 
#define blocksize (EXT2_BLOCK_SIZE(inode->i_sb))
33 
#define addr_per_block (EXT2_ADDR_PER_BLOCK(inode->i_sb))
34 
 
35 
static __inline__ int sync_block (struct inode * inode, u32 * block, int wait)
36 
{
37 
        struct buffer_head * bh;
38 
        int tmp;
39 
 
40 
        if (!*block)
41 
                return 0;
42 
        tmp = *block;
43 
        bh = get_hash_table (inode->i_dev, *block, blocksize);
44 
        if (!bh)
45 
                return 0;
46 
        if (*block != tmp) {
47 
                brelse (bh);
48 
                return 1;
49 
        }
50 
        if (wait && buffer_req(bh) && !buffer_uptodate(bh)) {
51 
                brelse (bh);
52 
                return -1;
53 
        }
54 
        if (wait || !buffer_uptodate(bh) || !buffer_dirty(bh)) {
55 
                brelse (bh);
56 
                return 0;
57 
        }
58 
        ll_rw_block (WRITE, 1, &bh);
59 
        bh->b_count--;
60 
        return 0;
61 
}
62 
 
63 
static __inline__ int sync_block_swab32 (struct inode * inode, u32 * block, int wait)
64 
{
65 
        struct buffer_head * bh;
66 
        int tmp;
67 
 
68 
        if (!swab32(*block))
69 
                return 0;
70 
        tmp = swab32(*block);
71 
        bh = get_hash_table (inode->i_dev, swab32(*block), blocksize);
72 
        if (!bh)
73 
                return 0;
74 
        if (swab32(*block) != tmp) {
75 
                brelse (bh);
76 
                return 1;
77 
        }
78 
        if (wait && buffer_req(bh) && !buffer_uptodate(bh)) {
79 
                brelse (bh);
80 
                return -1;
81 
        }
82 
        if (wait || !buffer_uptodate(bh) || !buffer_dirty(bh)) {
83 
                brelse (bh);
84 
                return 0;
85 
        }
86 
        ll_rw_block (WRITE, 1, &bh);
87 
        bh->b_count--;
88 
        return 0;
89 
}
90 
 
91 
static __inline__ int sync_iblock (struct inode * inode, u32 * iblock,
92 
                        struct buffer_head ** bh, int wait)
93 
{
94 
        int rc, tmp;
95 
 
96 
        *bh = NULL;
97 
        tmp = *iblock;
98 
        if (!tmp)
99 
                return 0;
100 
        rc = sync_block (inode, iblock, wait);
101 
        if (rc)
102 
                return rc;
103 
        *bh = bread (inode->i_dev, tmp, blocksize);
104 
        if (tmp != *iblock) {
105 
                brelse (*bh);
106 
                *bh = NULL;
107 
                return 1;
108 
        }
109 
        if (!*bh)
110 
                return -1;
111 
        return 0;
112 
}
113 
 
114 
static __inline__ int sync_iblock_swab32 (struct inode * inode, u32 * iblock,
115 
                               struct buffer_head ** bh, int wait)
116 
{
117 
        int rc, tmp;
118 
 
119 
        *bh = NULL;
120 
        tmp = swab32(*iblock);
121 
        if (!tmp)
122 
                return 0;
123 
        rc = sync_block_swab32 (inode, iblock, wait);
124 
        if (rc)
125 
                return rc;
126 
        *bh = bread (inode->i_dev, tmp, blocksize);
127 
        if (tmp != swab32(*iblock)) {
128 
                brelse (*bh);
129 
                *bh = NULL;
130 
                return 1;
131 
        }
132 
        if (!*bh)
133 
                return -1;
134 
        return 0;
135 
}
136 
 
137 
 
138 
static __inline__ int sync_direct (struct inode * inode, int wait)
139 
{
140 
        int i;
141 
        int rc, err = 0;
142 
 
143 
        for (i = 0; i < EXT2_NDIR_BLOCKS; i++) {
144 
                rc = sync_block (inode, inode->u.ext2_i.i_data + i, wait);
145 
                if (rc > 0)
146 
                        break;
147 
                if (rc)
148 
                        err = rc;
149 
        }
150 
        return err;
151 
}
152 
 
153 
static __inline__ int sync_indirect (struct inode * inode, u32 * iblock, int wait)
154 
{
155 
        int i;
156 
        struct buffer_head * ind_bh;
157 
        int rc, err = 0;
158 
 
159 
        rc = sync_iblock (inode, iblock, &ind_bh, wait);
160 
        if (rc || !ind_bh)
161 
                return rc;
162 
 
163 
        for (i = 0; i < addr_per_block; i++) {
164 
                rc = sync_block_swab32 (inode,
165 
                                        ((u32 *) ind_bh->b_data) + i,
166 
                                        wait);
167 
                if (rc > 0)
168 
                        break;
169 
                if (rc)
170 
                        err = rc;
171 
        }
172 
        brelse (ind_bh);
173 
        return err;
174 
}
175 
 
176 
static __inline__ int sync_indirect_swab32 (struct inode * inode, u32 * iblock, int wait)
177 
{
178 
        int i;
179 
        struct buffer_head * ind_bh;
180 
        int rc, err = 0;
181 
 
182 
        rc = sync_iblock_swab32 (inode, iblock, &ind_bh, wait);
183 
        if (rc || !ind_bh)
184 
                return rc;
185 
 
186 
        for (i = 0; i < addr_per_block; i++) {
187 
                rc = sync_block_swab32 (inode,
188 
                                        ((u32 *) ind_bh->b_data) + i,
189 
                                        wait);
190 
                if (rc > 0)
191 
                        break;
192 
                if (rc)
193 
                        err = rc;
194 
        }
195 
        brelse (ind_bh);
196 
        return err;
197 
}
198 
 
199 
static __inline__ int sync_dindirect (struct inode * inode, u32 * diblock, int wait)
200 
{
201 
        int i;
202 
        struct buffer_head * dind_bh;
203 
        int rc, err = 0;
204 
 
205 
        rc = sync_iblock (inode, diblock, &dind_bh, wait);
206 
        if (rc || !dind_bh)
207 
                return rc;
208 
 
209 
        for (i = 0; i < addr_per_block; i++) {
210 
                rc = sync_indirect_swab32 (inode,
211 
                                           ((u32 *) dind_bh->b_data) + i,
212 
                                           wait);
213 
                if (rc > 0)
214 
                        break;
215 
                if (rc)
216 
                        err = rc;
217 
        }
218 
        brelse (dind_bh);
219 
        return err;
220 
}
221 
 
222 
static __inline__ int sync_dindirect_swab32 (struct inode * inode, u32 * diblock, int wait)
223 
{
224 
        int i;
225 
        struct buffer_head * dind_bh;
226 
        int rc, err = 0;
227 
 
228 
        rc = sync_iblock_swab32 (inode, diblock, &dind_bh, wait);
229 
        if (rc || !dind_bh)
230 
                return rc;
231 
 
232 
        for (i = 0; i < addr_per_block; i++) {
233 
                rc = sync_indirect_swab32 (inode,
234 
                                           ((u32 *) dind_bh->b_data) + i,
235 
                                           wait);
236 
                if (rc > 0)
237 
                        break;
238 
                if (rc)
239 
                        err = rc;
240 
        }
241 
        brelse (dind_bh);
242 
        return err;
243 
}
244 
 
245 
static __inline__ int sync_tindirect (struct inode * inode, u32 * tiblock, int wait)
246 
{
247 
        int i;
248 
        struct buffer_head * tind_bh;
249 
        int rc, err = 0;
250 
 
251 
        rc = sync_iblock (inode, tiblock, &tind_bh, wait);
252 
        if (rc || !tind_bh)
253 
                return rc;
254 
 
255 
        for (i = 0; i < addr_per_block; i++) {
256 
                rc = sync_dindirect_swab32 (inode,
257 
                                            ((u32 *) tind_bh->b_data) + i,
258 
                                            wait);
259 
                if (rc > 0)
260 
                        break;
261 
                if (rc)
262 
                        err = rc;
263 
        }
264 
        brelse (tind_bh);
265 
        return err;
266 
}
267 
 
268 
int ext2_sync_file (struct inode * inode, struct file * file)
269 
{
270 
        int wait, err = 0;
271 
 
272 
        if (S_ISLNK(inode->i_mode) && !(inode->i_blocks))
273 
                /*
274 
                 * Don't sync fast links!
275 
                 */
276 
                goto skip;
277 
 
278 
        /* fsync on large files is *slow*, so fall back to sync() if
279 
         * the file's over 10M */
280 
        if (inode->i_size>10000000) {
281 
                file_fsync(inode,file);
282 
                goto skip;
283 
        }
284 
 
285 
        for (wait=0; wait<=1; wait++)
286 
        {
287 
                err |= sync_direct (inode, wait);
288 
                err |= sync_indirect (inode,
289 
                                      inode->u.ext2_i.i_data+EXT2_IND_BLOCK,
290 
                                      wait);
291 
                err |= sync_dindirect (inode,
292 
                                       inode->u.ext2_i.i_data+EXT2_DIND_BLOCK,
293 
                                       wait);
294 
                err |= sync_tindirect (inode,
295 
                                       inode->u.ext2_i.i_data+EXT2_TIND_BLOCK,
296 
                                       wait);
297 
        }
298 
skip:
299 
        err |= ext2_sync_inode (inode);
300 
        return (err < 0) ? -EIO : 0;
301 
}

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