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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * Copyright (C) International Business Machines Corp., 2000-2004 | |
1da177e4 LT |
4 | */ |
5 | ||
6 | #include <linux/fs.h> | |
7 | #include <linux/quotaops.h> | |
8 | #include "jfs_incore.h" | |
1868f4aa | 9 | #include "jfs_inode.h" |
1da177e4 LT |
10 | #include "jfs_superblock.h" |
11 | #include "jfs_dmap.h" | |
12 | #include "jfs_extent.h" | |
13 | #include "jfs_debug.h" | |
14 | ||
15 | /* | |
16 | * forward references | |
17 | */ | |
18 | static int extBalloc(struct inode *, s64, s64 *, s64 *); | |
1da177e4 LT |
19 | static s64 extRoundDown(s64 nb); |
20 | ||
f720e3ba DK |
21 | #define DPD(a) (printk("(a): %d\n",(a))) |
22 | #define DPC(a) (printk("(a): %c\n",(a))) | |
1da177e4 LT |
23 | #define DPL1(a) \ |
24 | { \ | |
25 | if ((a) >> 32) \ | |
26 | printk("(a): %x%08x ",(a)); \ | |
27 | else \ | |
28 | printk("(a): %x ",(a) << 32); \ | |
29 | } | |
30 | #define DPL(a) \ | |
31 | { \ | |
32 | if ((a) >> 32) \ | |
33 | printk("(a): %x%08x\n",(a)); \ | |
34 | else \ | |
35 | printk("(a): %x\n",(a) << 32); \ | |
36 | } | |
37 | ||
f720e3ba DK |
38 | #define DPD1(a) (printk("(a): %d ",(a))) |
39 | #define DPX(a) (printk("(a): %08x\n",(a))) | |
40 | #define DPX1(a) (printk("(a): %08x ",(a))) | |
41 | #define DPS(a) (printk("%s\n",(a))) | |
42 | #define DPE(a) (printk("\nENTERING: %s\n",(a))) | |
43 | #define DPE1(a) (printk("\nENTERING: %s",(a))) | |
44 | #define DPS1(a) (printk(" %s ",(a))) | |
1da177e4 LT |
45 | |
46 | ||
47 | /* | |
48 | * NAME: extAlloc() | |
49 | * | |
f720e3ba | 50 | * FUNCTION: allocate an extent for a specified page range within a |
1da177e4 LT |
51 | * file. |
52 | * | |
53 | * PARAMETERS: | |
54 | * ip - the inode of the file. | |
55 | * xlen - requested extent length. | |
56 | * pno - the starting page number with the file. | |
57 | * xp - pointer to an xad. on entry, xad describes an | |
58 | * extent that is used as an allocation hint if the | |
59 | * xaddr of the xad is non-zero. on successful exit, | |
60 | * the xad describes the newly allocated extent. | |
4d81715f | 61 | * abnr - bool indicating whether the newly allocated extent |
1da177e4 LT |
62 | * should be marked as allocated but not recorded. |
63 | * | |
64 | * RETURN VALUES: | |
f720e3ba DK |
65 | * 0 - success |
66 | * -EIO - i/o error. | |
67 | * -ENOSPC - insufficient disk resources. | |
1da177e4 LT |
68 | */ |
69 | int | |
4d81715f | 70 | extAlloc(struct inode *ip, s64 xlen, s64 pno, xad_t * xp, bool abnr) |
1da177e4 LT |
71 | { |
72 | struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb); | |
73 | s64 nxlen, nxaddr, xoff, hint, xaddr = 0; | |
74 | int rc; | |
75 | int xflag; | |
76 | ||
77 | /* This blocks if we are low on resources */ | |
78 | txBeginAnon(ip->i_sb); | |
79 | ||
80 | /* Avoid race with jfs_commit_inode() */ | |
1de87444 | 81 | mutex_lock(&JFS_IP(ip)->commit_mutex); |
1da177e4 LT |
82 | |
83 | /* validate extent length */ | |
84 | if (xlen > MAXXLEN) | |
85 | xlen = MAXXLEN; | |
86 | ||
87 | /* get the page's starting extent offset */ | |
88 | xoff = pno << sbi->l2nbperpage; | |
89 | ||
90 | /* check if an allocation hint was provided */ | |
91 | if ((hint = addressXAD(xp))) { | |
92 | /* get the size of the extent described by the hint */ | |
93 | nxlen = lengthXAD(xp); | |
94 | ||
95 | /* check if the hint is for the portion of the file | |
96 | * immediately previous to the current allocation | |
97 | * request and if hint extent has the same abnr | |
98 | * value as the current request. if so, we can | |
99 | * extend the hint extent to include the current | |
100 | * extent if we can allocate the blocks immediately | |
101 | * following the hint extent. | |
102 | */ | |
103 | if (offsetXAD(xp) + nxlen == xoff && | |
4d81715f | 104 | abnr == ((xp->flag & XAD_NOTRECORDED) ? true : false)) |
1da177e4 LT |
105 | xaddr = hint + nxlen; |
106 | ||
107 | /* adjust the hint to the last block of the extent */ | |
108 | hint += (nxlen - 1); | |
109 | } | |
110 | ||
111 | /* allocate the disk blocks for the extent. initially, extBalloc() | |
63f83c9f | 112 | * will try to allocate disk blocks for the requested size (xlen). |
25985edc | 113 | * if this fails (xlen contiguous free blocks not available), it'll |
1da177e4 LT |
114 | * try to allocate a smaller number of blocks (producing a smaller |
115 | * extent), with this smaller number of blocks consisting of the | |
116 | * requested number of blocks rounded down to the next smaller | |
117 | * power of 2 number (i.e. 16 -> 8). it'll continue to round down | |
118 | * and retry the allocation until the number of blocks to allocate | |
119 | * is smaller than the number of blocks per page. | |
120 | */ | |
121 | nxlen = xlen; | |
122 | if ((rc = extBalloc(ip, hint ? hint : INOHINT(ip), &nxlen, &nxaddr))) { | |
1de87444 | 123 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
1da177e4 LT |
124 | return (rc); |
125 | } | |
126 | ||
127 | /* Allocate blocks to quota. */ | |
5dd4056d CH |
128 | rc = dquot_alloc_block(ip, nxlen); |
129 | if (rc) { | |
1da177e4 | 130 | dbFree(ip, nxaddr, (s64) nxlen); |
1de87444 | 131 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
5dd4056d | 132 | return rc; |
1da177e4 LT |
133 | } |
134 | ||
135 | /* determine the value of the extent flag */ | |
4d81715f | 136 | xflag = abnr ? XAD_NOTRECORDED : 0; |
1da177e4 | 137 | |
63f83c9f | 138 | /* if we can extend the hint extent to cover the current request, |
1da177e4 LT |
139 | * extend it. otherwise, insert a new extent to |
140 | * cover the current request. | |
141 | */ | |
142 | if (xaddr && xaddr == nxaddr) | |
143 | rc = xtExtend(0, ip, xoff, (int) nxlen, 0); | |
144 | else | |
145 | rc = xtInsert(0, ip, xflag, xoff, (int) nxlen, &nxaddr, 0); | |
146 | ||
63f83c9f | 147 | /* if the extend or insert failed, |
1da177e4 LT |
148 | * free the newly allocated blocks and return the error. |
149 | */ | |
150 | if (rc) { | |
151 | dbFree(ip, nxaddr, nxlen); | |
5dd4056d | 152 | dquot_free_block(ip, nxlen); |
1de87444 | 153 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
1da177e4 LT |
154 | return (rc); |
155 | } | |
156 | ||
157 | /* set the results of the extent allocation */ | |
158 | XADaddress(xp, nxaddr); | |
159 | XADlength(xp, nxlen); | |
160 | XADoffset(xp, xoff); | |
161 | xp->flag = xflag; | |
162 | ||
163 | mark_inode_dirty(ip); | |
164 | ||
1de87444 | 165 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
1da177e4 LT |
166 | /* |
167 | * COMMIT_SyncList flags an anonymous tlock on page that is on | |
168 | * sync list. | |
169 | * We need to commit the inode to get the page written disk. | |
170 | */ | |
171 | if (test_and_clear_cflag(COMMIT_Synclist,ip)) | |
172 | jfs_commit_inode(ip, 0); | |
173 | ||
174 | return (0); | |
175 | } | |
176 | ||
1da177e4 | 177 | /* |
f720e3ba | 178 | * NAME: extHint() |
1da177e4 | 179 | * |
f720e3ba | 180 | * FUNCTION: produce an extent allocation hint for a file offset. |
1da177e4 LT |
181 | * |
182 | * PARAMETERS: | |
183 | * ip - the inode of the file. | |
184 | * offset - file offset for which the hint is needed. | |
185 | * xp - pointer to the xad that is to be filled in with | |
186 | * the hint. | |
187 | * | |
188 | * RETURN VALUES: | |
f720e3ba DK |
189 | * 0 - success |
190 | * -EIO - i/o error. | |
1da177e4 LT |
191 | */ |
192 | int extHint(struct inode *ip, s64 offset, xad_t * xp) | |
193 | { | |
194 | struct super_block *sb = ip->i_sb; | |
fec1878f | 195 | int nbperpage = JFS_SBI(sb)->nbperpage; |
1da177e4 | 196 | s64 prev; |
fec1878f DK |
197 | int rc = 0; |
198 | s64 xaddr; | |
199 | int xlen; | |
200 | int xflag; | |
1da177e4 LT |
201 | |
202 | /* init the hint as "no hint provided" */ | |
203 | XADaddress(xp, 0); | |
204 | ||
205 | /* determine the starting extent offset of the page previous | |
206 | * to the page containing the offset. | |
207 | */ | |
208 | prev = ((offset & ~POFFSET) >> JFS_SBI(sb)->l2bsize) - nbperpage; | |
209 | ||
fec1878f | 210 | /* if the offset is in the first page of the file, no hint provided. |
1da177e4 LT |
211 | */ |
212 | if (prev < 0) | |
fec1878f | 213 | goto out; |
1da177e4 | 214 | |
fec1878f | 215 | rc = xtLookup(ip, prev, nbperpage, &xflag, &xaddr, &xlen, 0); |
1da177e4 | 216 | |
fec1878f DK |
217 | if ((rc == 0) && xlen) { |
218 | if (xlen != nbperpage) { | |
eb8630d7 | 219 | jfs_error(ip->i_sb, "corrupt xtree\n"); |
fec1878f DK |
220 | rc = -EIO; |
221 | } | |
222 | XADaddress(xp, xaddr); | |
223 | XADlength(xp, xlen); | |
f7c52fd1 | 224 | XADoffset(xp, prev); |
fec1878f DK |
225 | /* |
226 | * only preserve the abnr flag within the xad flags | |
227 | * of the returned hint. | |
228 | */ | |
229 | xp->flag = xflag & XAD_NOTRECORDED; | |
230 | } else | |
231 | rc = 0; | |
1da177e4 | 232 | |
fec1878f DK |
233 | out: |
234 | return (rc); | |
1da177e4 LT |
235 | } |
236 | ||
237 | ||
238 | /* | |
f720e3ba | 239 | * NAME: extRecord() |
1da177e4 | 240 | * |
f720e3ba | 241 | * FUNCTION: change a page with a file from not recorded to recorded. |
1da177e4 LT |
242 | * |
243 | * PARAMETERS: | |
244 | * ip - inode of the file. | |
245 | * cp - cbuf of the file page. | |
246 | * | |
247 | * RETURN VALUES: | |
f720e3ba DK |
248 | * 0 - success |
249 | * -EIO - i/o error. | |
250 | * -ENOSPC - insufficient disk resources. | |
1da177e4 LT |
251 | */ |
252 | int extRecord(struct inode *ip, xad_t * xp) | |
253 | { | |
254 | int rc; | |
255 | ||
256 | txBeginAnon(ip->i_sb); | |
257 | ||
1de87444 | 258 | mutex_lock(&JFS_IP(ip)->commit_mutex); |
1da177e4 LT |
259 | |
260 | /* update the extent */ | |
261 | rc = xtUpdate(0, ip, xp); | |
262 | ||
1de87444 | 263 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
1da177e4 LT |
264 | return rc; |
265 | } | |
266 | ||
1da177e4 LT |
267 | /* |
268 | * NAME: extBalloc() | |
269 | * | |
f720e3ba | 270 | * FUNCTION: allocate disk blocks to form an extent. |
1da177e4 LT |
271 | * |
272 | * initially, we will try to allocate disk blocks for the | |
63f83c9f | 273 | * requested size (nblocks). if this fails (nblocks |
25985edc | 274 | * contiguous free blocks not available), we'll try to allocate |
1da177e4 LT |
275 | * a smaller number of blocks (producing a smaller extent), with |
276 | * this smaller number of blocks consisting of the requested | |
277 | * number of blocks rounded down to the next smaller power of 2 | |
278 | * number (i.e. 16 -> 8). we'll continue to round down and | |
279 | * retry the allocation until the number of blocks to allocate | |
280 | * is smaller than the number of blocks per page. | |
63f83c9f | 281 | * |
1da177e4 LT |
282 | * PARAMETERS: |
283 | * ip - the inode of the file. | |
284 | * hint - disk block number to be used as an allocation hint. | |
285 | * *nblocks - pointer to an s64 value. on entry, this value specifies | |
286 | * the desired number of block to be allocated. on successful | |
287 | * exit, this value is set to the number of blocks actually | |
288 | * allocated. | |
289 | * blkno - pointer to a block address that is filled in on successful | |
63f83c9f | 290 | * return with the starting block number of the newly |
1da177e4 LT |
291 | * allocated block range. |
292 | * | |
293 | * RETURN VALUES: | |
f720e3ba DK |
294 | * 0 - success |
295 | * -EIO - i/o error. | |
296 | * -ENOSPC - insufficient disk resources. | |
1da177e4 LT |
297 | */ |
298 | static int | |
299 | extBalloc(struct inode *ip, s64 hint, s64 * nblocks, s64 * blkno) | |
300 | { | |
301 | struct jfs_inode_info *ji = JFS_IP(ip); | |
302 | struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb); | |
303 | s64 nb, nblks, daddr, max; | |
304 | int rc, nbperpage = sbi->nbperpage; | |
305 | struct bmap *bmp = sbi->bmap; | |
306 | int ag; | |
307 | ||
308 | /* get the number of blocks to initially attempt to allocate. | |
309 | * we'll first try the number of blocks requested unless this | |
d6e05edc | 310 | * number is greater than the maximum number of contiguous free |
63f83c9f | 311 | * blocks in the map. in that case, we'll start off with the |
1da177e4 LT |
312 | * maximum free. |
313 | */ | |
314 | max = (s64) 1 << bmp->db_maxfreebud; | |
315 | if (*nblocks >= max && *nblocks > nbperpage) | |
316 | nb = nblks = (max > nbperpage) ? max : nbperpage; | |
317 | else | |
318 | nb = nblks = *nblocks; | |
319 | ||
320 | /* try to allocate blocks */ | |
321 | while ((rc = dbAlloc(ip, hint, nb, &daddr)) != 0) { | |
322 | /* if something other than an out of space error, | |
323 | * stop and return this error. | |
324 | */ | |
325 | if (rc != -ENOSPC) | |
326 | return (rc); | |
327 | ||
328 | /* decrease the allocation request size */ | |
329 | nb = min(nblks, extRoundDown(nb)); | |
330 | ||
331 | /* give up if we cannot cover a page */ | |
332 | if (nb < nbperpage) | |
333 | return (rc); | |
334 | } | |
335 | ||
336 | *nblocks = nb; | |
337 | *blkno = daddr; | |
338 | ||
339 | if (S_ISREG(ip->i_mode) && (ji->fileset == FILESYSTEM_I)) { | |
340 | ag = BLKTOAG(daddr, sbi); | |
341 | spin_lock_irq(&ji->ag_lock); | |
342 | if (ji->active_ag == -1) { | |
343 | atomic_inc(&bmp->db_active[ag]); | |
344 | ji->active_ag = ag; | |
345 | } else if (ji->active_ag != ag) { | |
346 | atomic_dec(&bmp->db_active[ji->active_ag]); | |
347 | atomic_inc(&bmp->db_active[ag]); | |
348 | ji->active_ag = ag; | |
349 | } | |
350 | spin_unlock_irq(&ji->ag_lock); | |
351 | } | |
352 | ||
353 | return (0); | |
354 | } | |
355 | ||
1da177e4 | 356 | /* |
f720e3ba | 357 | * NAME: extRoundDown() |
1da177e4 | 358 | * |
f720e3ba | 359 | * FUNCTION: round down a specified number of blocks to the next |
1da177e4 LT |
360 | * smallest power of 2 number. |
361 | * | |
362 | * PARAMETERS: | |
363 | * nb - the inode of the file. | |
364 | * | |
365 | * RETURN VALUES: | |
f720e3ba | 366 | * next smallest power of 2 number. |
1da177e4 LT |
367 | */ |
368 | static s64 extRoundDown(s64 nb) | |
369 | { | |
370 | int i; | |
371 | u64 m, k; | |
372 | ||
373 | for (i = 0, m = (u64) 1 << 63; i < 64; i++, m >>= 1) { | |
374 | if (m & nb) | |
375 | break; | |
376 | } | |
377 | ||
378 | i = 63 - i; | |
379 | k = (u64) 1 << i; | |
380 | k = ((k - 1) & nb) ? k : k >> 1; | |
381 | ||
382 | return (k); | |
383 | } |