Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
f07c2250 | 2 | * Copyright (c) 2000-2006 Silicon Graphics, Inc. |
7b718769 | 3 | * All Rights Reserved. |
1da177e4 | 4 | * |
7b718769 NS |
5 | * This program is free software; you can redistribute it and/or |
6 | * modify it under the terms of the GNU General Public License as | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
9 | * This program is distributed in the hope that it would be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
1da177e4 | 13 | * |
7b718769 NS |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write the Free Software Foundation, | |
16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1da177e4 | 17 | */ |
93c189c1 | 18 | #include "xfs.h" |
1da177e4 LT |
19 | #include <linux/stddef.h> |
20 | #include <linux/errno.h> | |
5a0e3ad6 | 21 | #include <linux/gfp.h> |
1da177e4 LT |
22 | #include <linux/pagemap.h> |
23 | #include <linux/init.h> | |
24 | #include <linux/vmalloc.h> | |
25 | #include <linux/bio.h> | |
26 | #include <linux/sysctl.h> | |
27 | #include <linux/proc_fs.h> | |
28 | #include <linux/workqueue.h> | |
29 | #include <linux/percpu.h> | |
30 | #include <linux/blkdev.h> | |
31 | #include <linux/hash.h> | |
4df08c52 | 32 | #include <linux/kthread.h> |
b20a3503 | 33 | #include <linux/migrate.h> |
3fcfab16 | 34 | #include <linux/backing-dev.h> |
7dfb7103 | 35 | #include <linux/freezer.h> |
089716aa | 36 | #include <linux/list_sort.h> |
1da177e4 | 37 | |
b7963133 CH |
38 | #include "xfs_sb.h" |
39 | #include "xfs_inum.h" | |
ed3b4d6c | 40 | #include "xfs_log.h" |
b7963133 | 41 | #include "xfs_ag.h" |
b7963133 | 42 | #include "xfs_mount.h" |
0b1b213f | 43 | #include "xfs_trace.h" |
b7963133 | 44 | |
7989cb8e | 45 | static kmem_zone_t *xfs_buf_zone; |
a6867a68 | 46 | STATIC int xfsbufd(void *); |
7f8275d0 | 47 | STATIC int xfsbufd_wakeup(struct shrinker *, int, gfp_t); |
ce8e922c | 48 | STATIC void xfs_buf_delwri_queue(xfs_buf_t *, int); |
8e1f936b RR |
49 | static struct shrinker xfs_buf_shake = { |
50 | .shrink = xfsbufd_wakeup, | |
51 | .seeks = DEFAULT_SEEKS, | |
52 | }; | |
23ea4032 | 53 | |
7989cb8e | 54 | static struct workqueue_struct *xfslogd_workqueue; |
0829c360 | 55 | struct workqueue_struct *xfsdatad_workqueue; |
c626d174 | 56 | struct workqueue_struct *xfsconvertd_workqueue; |
1da177e4 | 57 | |
ce8e922c NS |
58 | #ifdef XFS_BUF_LOCK_TRACKING |
59 | # define XB_SET_OWNER(bp) ((bp)->b_last_holder = current->pid) | |
60 | # define XB_CLEAR_OWNER(bp) ((bp)->b_last_holder = -1) | |
61 | # define XB_GET_OWNER(bp) ((bp)->b_last_holder) | |
1da177e4 | 62 | #else |
ce8e922c NS |
63 | # define XB_SET_OWNER(bp) do { } while (0) |
64 | # define XB_CLEAR_OWNER(bp) do { } while (0) | |
65 | # define XB_GET_OWNER(bp) do { } while (0) | |
1da177e4 LT |
66 | #endif |
67 | ||
ce8e922c NS |
68 | #define xb_to_gfp(flags) \ |
69 | ((((flags) & XBF_READ_AHEAD) ? __GFP_NORETRY : \ | |
70 | ((flags) & XBF_DONT_BLOCK) ? GFP_NOFS : GFP_KERNEL) | __GFP_NOWARN) | |
1da177e4 | 71 | |
ce8e922c NS |
72 | #define xb_to_km(flags) \ |
73 | (((flags) & XBF_DONT_BLOCK) ? KM_NOFS : KM_SLEEP) | |
1da177e4 | 74 | |
ce8e922c NS |
75 | #define xfs_buf_allocate(flags) \ |
76 | kmem_zone_alloc(xfs_buf_zone, xb_to_km(flags)) | |
77 | #define xfs_buf_deallocate(bp) \ | |
78 | kmem_zone_free(xfs_buf_zone, (bp)); | |
1da177e4 | 79 | |
73c77e2c JB |
80 | static inline int |
81 | xfs_buf_is_vmapped( | |
82 | struct xfs_buf *bp) | |
83 | { | |
84 | /* | |
85 | * Return true if the buffer is vmapped. | |
86 | * | |
87 | * The XBF_MAPPED flag is set if the buffer should be mapped, but the | |
88 | * code is clever enough to know it doesn't have to map a single page, | |
89 | * so the check has to be both for XBF_MAPPED and bp->b_page_count > 1. | |
90 | */ | |
91 | return (bp->b_flags & XBF_MAPPED) && bp->b_page_count > 1; | |
92 | } | |
93 | ||
94 | static inline int | |
95 | xfs_buf_vmap_len( | |
96 | struct xfs_buf *bp) | |
97 | { | |
98 | return (bp->b_page_count * PAGE_SIZE) - bp->b_offset; | |
99 | } | |
100 | ||
1da177e4 | 101 | /* |
ce8e922c | 102 | * Page Region interfaces. |
1da177e4 | 103 | * |
ce8e922c NS |
104 | * For pages in filesystems where the blocksize is smaller than the |
105 | * pagesize, we use the page->private field (long) to hold a bitmap | |
106 | * of uptodate regions within the page. | |
1da177e4 | 107 | * |
ce8e922c | 108 | * Each such region is "bytes per page / bits per long" bytes long. |
1da177e4 | 109 | * |
ce8e922c NS |
110 | * NBPPR == number-of-bytes-per-page-region |
111 | * BTOPR == bytes-to-page-region (rounded up) | |
112 | * BTOPRT == bytes-to-page-region-truncated (rounded down) | |
1da177e4 LT |
113 | */ |
114 | #if (BITS_PER_LONG == 32) | |
115 | #define PRSHIFT (PAGE_CACHE_SHIFT - 5) /* (32 == 1<<5) */ | |
116 | #elif (BITS_PER_LONG == 64) | |
117 | #define PRSHIFT (PAGE_CACHE_SHIFT - 6) /* (64 == 1<<6) */ | |
118 | #else | |
119 | #error BITS_PER_LONG must be 32 or 64 | |
120 | #endif | |
121 | #define NBPPR (PAGE_CACHE_SIZE/BITS_PER_LONG) | |
122 | #define BTOPR(b) (((unsigned int)(b) + (NBPPR - 1)) >> PRSHIFT) | |
123 | #define BTOPRT(b) (((unsigned int)(b) >> PRSHIFT)) | |
124 | ||
125 | STATIC unsigned long | |
126 | page_region_mask( | |
127 | size_t offset, | |
128 | size_t length) | |
129 | { | |
130 | unsigned long mask; | |
131 | int first, final; | |
132 | ||
133 | first = BTOPR(offset); | |
134 | final = BTOPRT(offset + length - 1); | |
135 | first = min(first, final); | |
136 | ||
137 | mask = ~0UL; | |
138 | mask <<= BITS_PER_LONG - (final - first); | |
139 | mask >>= BITS_PER_LONG - (final); | |
140 | ||
141 | ASSERT(offset + length <= PAGE_CACHE_SIZE); | |
142 | ASSERT((final - first) < BITS_PER_LONG && (final - first) >= 0); | |
143 | ||
144 | return mask; | |
145 | } | |
146 | ||
b8f82a4a | 147 | STATIC void |
1da177e4 LT |
148 | set_page_region( |
149 | struct page *page, | |
150 | size_t offset, | |
151 | size_t length) | |
152 | { | |
4c21e2f2 HD |
153 | set_page_private(page, |
154 | page_private(page) | page_region_mask(offset, length)); | |
155 | if (page_private(page) == ~0UL) | |
1da177e4 LT |
156 | SetPageUptodate(page); |
157 | } | |
158 | ||
b8f82a4a | 159 | STATIC int |
1da177e4 LT |
160 | test_page_region( |
161 | struct page *page, | |
162 | size_t offset, | |
163 | size_t length) | |
164 | { | |
165 | unsigned long mask = page_region_mask(offset, length); | |
166 | ||
4c21e2f2 | 167 | return (mask && (page_private(page) & mask) == mask); |
1da177e4 LT |
168 | } |
169 | ||
1da177e4 | 170 | /* |
ce8e922c | 171 | * Internal xfs_buf_t object manipulation |
1da177e4 LT |
172 | */ |
173 | ||
174 | STATIC void | |
ce8e922c NS |
175 | _xfs_buf_initialize( |
176 | xfs_buf_t *bp, | |
1da177e4 | 177 | xfs_buftarg_t *target, |
204ab25f | 178 | xfs_off_t range_base, |
1da177e4 | 179 | size_t range_length, |
ce8e922c | 180 | xfs_buf_flags_t flags) |
1da177e4 LT |
181 | { |
182 | /* | |
ce8e922c | 183 | * We don't want certain flags to appear in b_flags. |
1da177e4 | 184 | */ |
ce8e922c NS |
185 | flags &= ~(XBF_LOCK|XBF_MAPPED|XBF_DONT_BLOCK|XBF_READ_AHEAD); |
186 | ||
187 | memset(bp, 0, sizeof(xfs_buf_t)); | |
188 | atomic_set(&bp->b_hold, 1); | |
b4dd330b | 189 | init_completion(&bp->b_iowait); |
ce8e922c NS |
190 | INIT_LIST_HEAD(&bp->b_list); |
191 | INIT_LIST_HEAD(&bp->b_hash_list); | |
192 | init_MUTEX_LOCKED(&bp->b_sema); /* held, no waiters */ | |
193 | XB_SET_OWNER(bp); | |
194 | bp->b_target = target; | |
195 | bp->b_file_offset = range_base; | |
1da177e4 LT |
196 | /* |
197 | * Set buffer_length and count_desired to the same value initially. | |
198 | * I/O routines should use count_desired, which will be the same in | |
199 | * most cases but may be reset (e.g. XFS recovery). | |
200 | */ | |
ce8e922c NS |
201 | bp->b_buffer_length = bp->b_count_desired = range_length; |
202 | bp->b_flags = flags; | |
203 | bp->b_bn = XFS_BUF_DADDR_NULL; | |
204 | atomic_set(&bp->b_pin_count, 0); | |
205 | init_waitqueue_head(&bp->b_waiters); | |
206 | ||
207 | XFS_STATS_INC(xb_create); | |
0b1b213f CH |
208 | |
209 | trace_xfs_buf_init(bp, _RET_IP_); | |
1da177e4 LT |
210 | } |
211 | ||
212 | /* | |
ce8e922c NS |
213 | * Allocate a page array capable of holding a specified number |
214 | * of pages, and point the page buf at it. | |
1da177e4 LT |
215 | */ |
216 | STATIC int | |
ce8e922c NS |
217 | _xfs_buf_get_pages( |
218 | xfs_buf_t *bp, | |
1da177e4 | 219 | int page_count, |
ce8e922c | 220 | xfs_buf_flags_t flags) |
1da177e4 LT |
221 | { |
222 | /* Make sure that we have a page list */ | |
ce8e922c NS |
223 | if (bp->b_pages == NULL) { |
224 | bp->b_offset = xfs_buf_poff(bp->b_file_offset); | |
225 | bp->b_page_count = page_count; | |
226 | if (page_count <= XB_PAGES) { | |
227 | bp->b_pages = bp->b_page_array; | |
1da177e4 | 228 | } else { |
ce8e922c NS |
229 | bp->b_pages = kmem_alloc(sizeof(struct page *) * |
230 | page_count, xb_to_km(flags)); | |
231 | if (bp->b_pages == NULL) | |
1da177e4 LT |
232 | return -ENOMEM; |
233 | } | |
ce8e922c | 234 | memset(bp->b_pages, 0, sizeof(struct page *) * page_count); |
1da177e4 LT |
235 | } |
236 | return 0; | |
237 | } | |
238 | ||
239 | /* | |
ce8e922c | 240 | * Frees b_pages if it was allocated. |
1da177e4 LT |
241 | */ |
242 | STATIC void | |
ce8e922c | 243 | _xfs_buf_free_pages( |
1da177e4 LT |
244 | xfs_buf_t *bp) |
245 | { | |
ce8e922c | 246 | if (bp->b_pages != bp->b_page_array) { |
f0e2d93c | 247 | kmem_free(bp->b_pages); |
3fc98b1a | 248 | bp->b_pages = NULL; |
1da177e4 LT |
249 | } |
250 | } | |
251 | ||
252 | /* | |
253 | * Releases the specified buffer. | |
254 | * | |
255 | * The modification state of any associated pages is left unchanged. | |
ce8e922c | 256 | * The buffer most not be on any hash - use xfs_buf_rele instead for |
1da177e4 LT |
257 | * hashed and refcounted buffers |
258 | */ | |
259 | void | |
ce8e922c | 260 | xfs_buf_free( |
1da177e4 LT |
261 | xfs_buf_t *bp) |
262 | { | |
0b1b213f | 263 | trace_xfs_buf_free(bp, _RET_IP_); |
1da177e4 | 264 | |
ce8e922c | 265 | ASSERT(list_empty(&bp->b_hash_list)); |
1da177e4 | 266 | |
1fa40b01 | 267 | if (bp->b_flags & (_XBF_PAGE_CACHE|_XBF_PAGES)) { |
1da177e4 LT |
268 | uint i; |
269 | ||
73c77e2c | 270 | if (xfs_buf_is_vmapped(bp)) |
8a262e57 AE |
271 | vm_unmap_ram(bp->b_addr - bp->b_offset, |
272 | bp->b_page_count); | |
1da177e4 | 273 | |
948ecdb4 NS |
274 | for (i = 0; i < bp->b_page_count; i++) { |
275 | struct page *page = bp->b_pages[i]; | |
276 | ||
1fa40b01 CH |
277 | if (bp->b_flags & _XBF_PAGE_CACHE) |
278 | ASSERT(!PagePrivate(page)); | |
948ecdb4 NS |
279 | page_cache_release(page); |
280 | } | |
1da177e4 | 281 | } |
3fc98b1a | 282 | _xfs_buf_free_pages(bp); |
ce8e922c | 283 | xfs_buf_deallocate(bp); |
1da177e4 LT |
284 | } |
285 | ||
286 | /* | |
287 | * Finds all pages for buffer in question and builds it's page list. | |
288 | */ | |
289 | STATIC int | |
ce8e922c | 290 | _xfs_buf_lookup_pages( |
1da177e4 LT |
291 | xfs_buf_t *bp, |
292 | uint flags) | |
293 | { | |
ce8e922c NS |
294 | struct address_space *mapping = bp->b_target->bt_mapping; |
295 | size_t blocksize = bp->b_target->bt_bsize; | |
296 | size_t size = bp->b_count_desired; | |
1da177e4 | 297 | size_t nbytes, offset; |
ce8e922c | 298 | gfp_t gfp_mask = xb_to_gfp(flags); |
1da177e4 LT |
299 | unsigned short page_count, i; |
300 | pgoff_t first; | |
204ab25f | 301 | xfs_off_t end; |
1da177e4 LT |
302 | int error; |
303 | ||
ce8e922c NS |
304 | end = bp->b_file_offset + bp->b_buffer_length; |
305 | page_count = xfs_buf_btoc(end) - xfs_buf_btoct(bp->b_file_offset); | |
1da177e4 | 306 | |
ce8e922c | 307 | error = _xfs_buf_get_pages(bp, page_count, flags); |
1da177e4 LT |
308 | if (unlikely(error)) |
309 | return error; | |
ce8e922c | 310 | bp->b_flags |= _XBF_PAGE_CACHE; |
1da177e4 | 311 | |
ce8e922c NS |
312 | offset = bp->b_offset; |
313 | first = bp->b_file_offset >> PAGE_CACHE_SHIFT; | |
1da177e4 | 314 | |
ce8e922c | 315 | for (i = 0; i < bp->b_page_count; i++) { |
1da177e4 LT |
316 | struct page *page; |
317 | uint retries = 0; | |
318 | ||
319 | retry: | |
320 | page = find_or_create_page(mapping, first + i, gfp_mask); | |
321 | if (unlikely(page == NULL)) { | |
ce8e922c NS |
322 | if (flags & XBF_READ_AHEAD) { |
323 | bp->b_page_count = i; | |
6ab455ee CH |
324 | for (i = 0; i < bp->b_page_count; i++) |
325 | unlock_page(bp->b_pages[i]); | |
1da177e4 LT |
326 | return -ENOMEM; |
327 | } | |
328 | ||
329 | /* | |
330 | * This could deadlock. | |
331 | * | |
332 | * But until all the XFS lowlevel code is revamped to | |
333 | * handle buffer allocation failures we can't do much. | |
334 | */ | |
335 | if (!(++retries % 100)) | |
336 | printk(KERN_ERR | |
337 | "XFS: possible memory allocation " | |
338 | "deadlock in %s (mode:0x%x)\n", | |
34a622b2 | 339 | __func__, gfp_mask); |
1da177e4 | 340 | |
ce8e922c | 341 | XFS_STATS_INC(xb_page_retries); |
7f8275d0 | 342 | xfsbufd_wakeup(NULL, 0, gfp_mask); |
8aa7e847 | 343 | congestion_wait(BLK_RW_ASYNC, HZ/50); |
1da177e4 LT |
344 | goto retry; |
345 | } | |
346 | ||
ce8e922c | 347 | XFS_STATS_INC(xb_page_found); |
1da177e4 LT |
348 | |
349 | nbytes = min_t(size_t, size, PAGE_CACHE_SIZE - offset); | |
350 | size -= nbytes; | |
351 | ||
948ecdb4 | 352 | ASSERT(!PagePrivate(page)); |
1da177e4 LT |
353 | if (!PageUptodate(page)) { |
354 | page_count--; | |
6ab455ee CH |
355 | if (blocksize >= PAGE_CACHE_SIZE) { |
356 | if (flags & XBF_READ) | |
357 | bp->b_flags |= _XBF_PAGE_LOCKED; | |
358 | } else if (!PagePrivate(page)) { | |
1da177e4 LT |
359 | if (test_page_region(page, offset, nbytes)) |
360 | page_count++; | |
361 | } | |
362 | } | |
363 | ||
ce8e922c | 364 | bp->b_pages[i] = page; |
1da177e4 LT |
365 | offset = 0; |
366 | } | |
367 | ||
6ab455ee CH |
368 | if (!(bp->b_flags & _XBF_PAGE_LOCKED)) { |
369 | for (i = 0; i < bp->b_page_count; i++) | |
370 | unlock_page(bp->b_pages[i]); | |
371 | } | |
372 | ||
ce8e922c NS |
373 | if (page_count == bp->b_page_count) |
374 | bp->b_flags |= XBF_DONE; | |
1da177e4 | 375 | |
1da177e4 LT |
376 | return error; |
377 | } | |
378 | ||
379 | /* | |
380 | * Map buffer into kernel address-space if nessecary. | |
381 | */ | |
382 | STATIC int | |
ce8e922c | 383 | _xfs_buf_map_pages( |
1da177e4 LT |
384 | xfs_buf_t *bp, |
385 | uint flags) | |
386 | { | |
387 | /* A single page buffer is always mappable */ | |
ce8e922c NS |
388 | if (bp->b_page_count == 1) { |
389 | bp->b_addr = page_address(bp->b_pages[0]) + bp->b_offset; | |
390 | bp->b_flags |= XBF_MAPPED; | |
391 | } else if (flags & XBF_MAPPED) { | |
8a262e57 AE |
392 | bp->b_addr = vm_map_ram(bp->b_pages, bp->b_page_count, |
393 | -1, PAGE_KERNEL); | |
ce8e922c | 394 | if (unlikely(bp->b_addr == NULL)) |
1da177e4 | 395 | return -ENOMEM; |
ce8e922c NS |
396 | bp->b_addr += bp->b_offset; |
397 | bp->b_flags |= XBF_MAPPED; | |
1da177e4 LT |
398 | } |
399 | ||
400 | return 0; | |
401 | } | |
402 | ||
403 | /* | |
404 | * Finding and Reading Buffers | |
405 | */ | |
406 | ||
407 | /* | |
ce8e922c | 408 | * Look up, and creates if absent, a lockable buffer for |
1da177e4 LT |
409 | * a given range of an inode. The buffer is returned |
410 | * locked. If other overlapping buffers exist, they are | |
411 | * released before the new buffer is created and locked, | |
412 | * which may imply that this call will block until those buffers | |
413 | * are unlocked. No I/O is implied by this call. | |
414 | */ | |
415 | xfs_buf_t * | |
ce8e922c | 416 | _xfs_buf_find( |
1da177e4 | 417 | xfs_buftarg_t *btp, /* block device target */ |
204ab25f | 418 | xfs_off_t ioff, /* starting offset of range */ |
1da177e4 | 419 | size_t isize, /* length of range */ |
ce8e922c NS |
420 | xfs_buf_flags_t flags, |
421 | xfs_buf_t *new_bp) | |
1da177e4 | 422 | { |
204ab25f | 423 | xfs_off_t range_base; |
1da177e4 LT |
424 | size_t range_length; |
425 | xfs_bufhash_t *hash; | |
ce8e922c | 426 | xfs_buf_t *bp, *n; |
1da177e4 LT |
427 | |
428 | range_base = (ioff << BBSHIFT); | |
429 | range_length = (isize << BBSHIFT); | |
430 | ||
431 | /* Check for IOs smaller than the sector size / not sector aligned */ | |
ce8e922c | 432 | ASSERT(!(range_length < (1 << btp->bt_sshift))); |
204ab25f | 433 | ASSERT(!(range_base & (xfs_off_t)btp->bt_smask)); |
1da177e4 LT |
434 | |
435 | hash = &btp->bt_hash[hash_long((unsigned long)ioff, btp->bt_hashshift)]; | |
436 | ||
437 | spin_lock(&hash->bh_lock); | |
438 | ||
ce8e922c NS |
439 | list_for_each_entry_safe(bp, n, &hash->bh_list, b_hash_list) { |
440 | ASSERT(btp == bp->b_target); | |
441 | if (bp->b_file_offset == range_base && | |
442 | bp->b_buffer_length == range_length) { | |
ce8e922c | 443 | atomic_inc(&bp->b_hold); |
1da177e4 LT |
444 | goto found; |
445 | } | |
446 | } | |
447 | ||
448 | /* No match found */ | |
ce8e922c NS |
449 | if (new_bp) { |
450 | _xfs_buf_initialize(new_bp, btp, range_base, | |
1da177e4 | 451 | range_length, flags); |
ce8e922c NS |
452 | new_bp->b_hash = hash; |
453 | list_add(&new_bp->b_hash_list, &hash->bh_list); | |
1da177e4 | 454 | } else { |
ce8e922c | 455 | XFS_STATS_INC(xb_miss_locked); |
1da177e4 LT |
456 | } |
457 | ||
458 | spin_unlock(&hash->bh_lock); | |
ce8e922c | 459 | return new_bp; |
1da177e4 LT |
460 | |
461 | found: | |
462 | spin_unlock(&hash->bh_lock); | |
463 | ||
464 | /* Attempt to get the semaphore without sleeping, | |
465 | * if this does not work then we need to drop the | |
466 | * spinlock and do a hard attempt on the semaphore. | |
467 | */ | |
ce8e922c NS |
468 | if (down_trylock(&bp->b_sema)) { |
469 | if (!(flags & XBF_TRYLOCK)) { | |
1da177e4 | 470 | /* wait for buffer ownership */ |
ce8e922c NS |
471 | xfs_buf_lock(bp); |
472 | XFS_STATS_INC(xb_get_locked_waited); | |
1da177e4 LT |
473 | } else { |
474 | /* We asked for a trylock and failed, no need | |
475 | * to look at file offset and length here, we | |
ce8e922c NS |
476 | * know that this buffer at least overlaps our |
477 | * buffer and is locked, therefore our buffer | |
478 | * either does not exist, or is this buffer. | |
1da177e4 | 479 | */ |
ce8e922c NS |
480 | xfs_buf_rele(bp); |
481 | XFS_STATS_INC(xb_busy_locked); | |
482 | return NULL; | |
1da177e4 LT |
483 | } |
484 | } else { | |
485 | /* trylock worked */ | |
ce8e922c | 486 | XB_SET_OWNER(bp); |
1da177e4 LT |
487 | } |
488 | ||
ce8e922c NS |
489 | if (bp->b_flags & XBF_STALE) { |
490 | ASSERT((bp->b_flags & _XBF_DELWRI_Q) == 0); | |
491 | bp->b_flags &= XBF_MAPPED; | |
2f926587 | 492 | } |
0b1b213f CH |
493 | |
494 | trace_xfs_buf_find(bp, flags, _RET_IP_); | |
ce8e922c NS |
495 | XFS_STATS_INC(xb_get_locked); |
496 | return bp; | |
1da177e4 LT |
497 | } |
498 | ||
499 | /* | |
ce8e922c | 500 | * Assembles a buffer covering the specified range. |
1da177e4 LT |
501 | * Storage in memory for all portions of the buffer will be allocated, |
502 | * although backing storage may not be. | |
503 | */ | |
504 | xfs_buf_t * | |
6ad112bf | 505 | xfs_buf_get( |
1da177e4 | 506 | xfs_buftarg_t *target,/* target for buffer */ |
204ab25f | 507 | xfs_off_t ioff, /* starting offset of range */ |
1da177e4 | 508 | size_t isize, /* length of range */ |
ce8e922c | 509 | xfs_buf_flags_t flags) |
1da177e4 | 510 | { |
ce8e922c | 511 | xfs_buf_t *bp, *new_bp; |
1da177e4 LT |
512 | int error = 0, i; |
513 | ||
ce8e922c NS |
514 | new_bp = xfs_buf_allocate(flags); |
515 | if (unlikely(!new_bp)) | |
1da177e4 LT |
516 | return NULL; |
517 | ||
ce8e922c NS |
518 | bp = _xfs_buf_find(target, ioff, isize, flags, new_bp); |
519 | if (bp == new_bp) { | |
520 | error = _xfs_buf_lookup_pages(bp, flags); | |
1da177e4 LT |
521 | if (error) |
522 | goto no_buffer; | |
523 | } else { | |
ce8e922c NS |
524 | xfs_buf_deallocate(new_bp); |
525 | if (unlikely(bp == NULL)) | |
1da177e4 LT |
526 | return NULL; |
527 | } | |
528 | ||
ce8e922c NS |
529 | for (i = 0; i < bp->b_page_count; i++) |
530 | mark_page_accessed(bp->b_pages[i]); | |
1da177e4 | 531 | |
ce8e922c NS |
532 | if (!(bp->b_flags & XBF_MAPPED)) { |
533 | error = _xfs_buf_map_pages(bp, flags); | |
1da177e4 LT |
534 | if (unlikely(error)) { |
535 | printk(KERN_WARNING "%s: failed to map pages\n", | |
34a622b2 | 536 | __func__); |
1da177e4 LT |
537 | goto no_buffer; |
538 | } | |
539 | } | |
540 | ||
ce8e922c | 541 | XFS_STATS_INC(xb_get); |
1da177e4 LT |
542 | |
543 | /* | |
544 | * Always fill in the block number now, the mapped cases can do | |
545 | * their own overlay of this later. | |
546 | */ | |
ce8e922c NS |
547 | bp->b_bn = ioff; |
548 | bp->b_count_desired = bp->b_buffer_length; | |
1da177e4 | 549 | |
0b1b213f | 550 | trace_xfs_buf_get(bp, flags, _RET_IP_); |
ce8e922c | 551 | return bp; |
1da177e4 LT |
552 | |
553 | no_buffer: | |
ce8e922c NS |
554 | if (flags & (XBF_LOCK | XBF_TRYLOCK)) |
555 | xfs_buf_unlock(bp); | |
556 | xfs_buf_rele(bp); | |
1da177e4 LT |
557 | return NULL; |
558 | } | |
559 | ||
5d765b97 CH |
560 | STATIC int |
561 | _xfs_buf_read( | |
562 | xfs_buf_t *bp, | |
563 | xfs_buf_flags_t flags) | |
564 | { | |
565 | int status; | |
566 | ||
5d765b97 CH |
567 | ASSERT(!(flags & (XBF_DELWRI|XBF_WRITE))); |
568 | ASSERT(bp->b_bn != XFS_BUF_DADDR_NULL); | |
569 | ||
570 | bp->b_flags &= ~(XBF_WRITE | XBF_ASYNC | XBF_DELWRI | \ | |
571 | XBF_READ_AHEAD | _XBF_RUN_QUEUES); | |
572 | bp->b_flags |= flags & (XBF_READ | XBF_ASYNC | \ | |
573 | XBF_READ_AHEAD | _XBF_RUN_QUEUES); | |
574 | ||
575 | status = xfs_buf_iorequest(bp); | |
ec53d1db DC |
576 | if (status || XFS_BUF_ISERROR(bp) || (flags & XBF_ASYNC)) |
577 | return status; | |
578 | return xfs_buf_iowait(bp); | |
5d765b97 CH |
579 | } |
580 | ||
1da177e4 | 581 | xfs_buf_t * |
6ad112bf | 582 | xfs_buf_read( |
1da177e4 | 583 | xfs_buftarg_t *target, |
204ab25f | 584 | xfs_off_t ioff, |
1da177e4 | 585 | size_t isize, |
ce8e922c | 586 | xfs_buf_flags_t flags) |
1da177e4 | 587 | { |
ce8e922c NS |
588 | xfs_buf_t *bp; |
589 | ||
590 | flags |= XBF_READ; | |
591 | ||
6ad112bf | 592 | bp = xfs_buf_get(target, ioff, isize, flags); |
ce8e922c | 593 | if (bp) { |
0b1b213f CH |
594 | trace_xfs_buf_read(bp, flags, _RET_IP_); |
595 | ||
ce8e922c | 596 | if (!XFS_BUF_ISDONE(bp)) { |
ce8e922c | 597 | XFS_STATS_INC(xb_get_read); |
5d765b97 | 598 | _xfs_buf_read(bp, flags); |
ce8e922c | 599 | } else if (flags & XBF_ASYNC) { |
1da177e4 LT |
600 | /* |
601 | * Read ahead call which is already satisfied, | |
602 | * drop the buffer | |
603 | */ | |
604 | goto no_buffer; | |
605 | } else { | |
1da177e4 | 606 | /* We do not want read in the flags */ |
ce8e922c | 607 | bp->b_flags &= ~XBF_READ; |
1da177e4 LT |
608 | } |
609 | } | |
610 | ||
ce8e922c | 611 | return bp; |
1da177e4 LT |
612 | |
613 | no_buffer: | |
ce8e922c NS |
614 | if (flags & (XBF_LOCK | XBF_TRYLOCK)) |
615 | xfs_buf_unlock(bp); | |
616 | xfs_buf_rele(bp); | |
1da177e4 LT |
617 | return NULL; |
618 | } | |
619 | ||
1da177e4 | 620 | /* |
ce8e922c NS |
621 | * If we are not low on memory then do the readahead in a deadlock |
622 | * safe manner. | |
1da177e4 LT |
623 | */ |
624 | void | |
ce8e922c | 625 | xfs_buf_readahead( |
1da177e4 | 626 | xfs_buftarg_t *target, |
204ab25f | 627 | xfs_off_t ioff, |
1da177e4 | 628 | size_t isize, |
ce8e922c | 629 | xfs_buf_flags_t flags) |
1da177e4 LT |
630 | { |
631 | struct backing_dev_info *bdi; | |
632 | ||
ce8e922c | 633 | bdi = target->bt_mapping->backing_dev_info; |
1da177e4 LT |
634 | if (bdi_read_congested(bdi)) |
635 | return; | |
636 | ||
ce8e922c | 637 | flags |= (XBF_TRYLOCK|XBF_ASYNC|XBF_READ_AHEAD); |
6ad112bf | 638 | xfs_buf_read(target, ioff, isize, flags); |
1da177e4 LT |
639 | } |
640 | ||
641 | xfs_buf_t * | |
ce8e922c | 642 | xfs_buf_get_empty( |
1da177e4 LT |
643 | size_t len, |
644 | xfs_buftarg_t *target) | |
645 | { | |
ce8e922c | 646 | xfs_buf_t *bp; |
1da177e4 | 647 | |
ce8e922c NS |
648 | bp = xfs_buf_allocate(0); |
649 | if (bp) | |
650 | _xfs_buf_initialize(bp, target, 0, len, 0); | |
651 | return bp; | |
1da177e4 LT |
652 | } |
653 | ||
654 | static inline struct page * | |
655 | mem_to_page( | |
656 | void *addr) | |
657 | { | |
9e2779fa | 658 | if ((!is_vmalloc_addr(addr))) { |
1da177e4 LT |
659 | return virt_to_page(addr); |
660 | } else { | |
661 | return vmalloc_to_page(addr); | |
662 | } | |
663 | } | |
664 | ||
665 | int | |
ce8e922c NS |
666 | xfs_buf_associate_memory( |
667 | xfs_buf_t *bp, | |
1da177e4 LT |
668 | void *mem, |
669 | size_t len) | |
670 | { | |
671 | int rval; | |
672 | int i = 0; | |
d1afb678 LM |
673 | unsigned long pageaddr; |
674 | unsigned long offset; | |
675 | size_t buflen; | |
1da177e4 LT |
676 | int page_count; |
677 | ||
d1afb678 LM |
678 | pageaddr = (unsigned long)mem & PAGE_CACHE_MASK; |
679 | offset = (unsigned long)mem - pageaddr; | |
680 | buflen = PAGE_CACHE_ALIGN(len + offset); | |
681 | page_count = buflen >> PAGE_CACHE_SHIFT; | |
1da177e4 LT |
682 | |
683 | /* Free any previous set of page pointers */ | |
ce8e922c NS |
684 | if (bp->b_pages) |
685 | _xfs_buf_free_pages(bp); | |
1da177e4 | 686 | |
ce8e922c NS |
687 | bp->b_pages = NULL; |
688 | bp->b_addr = mem; | |
1da177e4 | 689 | |
36fae17a | 690 | rval = _xfs_buf_get_pages(bp, page_count, XBF_DONT_BLOCK); |
1da177e4 LT |
691 | if (rval) |
692 | return rval; | |
693 | ||
ce8e922c | 694 | bp->b_offset = offset; |
d1afb678 LM |
695 | |
696 | for (i = 0; i < bp->b_page_count; i++) { | |
697 | bp->b_pages[i] = mem_to_page((void *)pageaddr); | |
698 | pageaddr += PAGE_CACHE_SIZE; | |
1da177e4 | 699 | } |
1da177e4 | 700 | |
d1afb678 LM |
701 | bp->b_count_desired = len; |
702 | bp->b_buffer_length = buflen; | |
ce8e922c | 703 | bp->b_flags |= XBF_MAPPED; |
6ab455ee | 704 | bp->b_flags &= ~_XBF_PAGE_LOCKED; |
1da177e4 LT |
705 | |
706 | return 0; | |
707 | } | |
708 | ||
709 | xfs_buf_t * | |
686865f7 DC |
710 | xfs_buf_get_uncached( |
711 | struct xfs_buftarg *target, | |
1da177e4 | 712 | size_t len, |
686865f7 | 713 | int flags) |
1da177e4 | 714 | { |
1fa40b01 CH |
715 | unsigned long page_count = PAGE_ALIGN(len) >> PAGE_SHIFT; |
716 | int error, i; | |
1da177e4 | 717 | xfs_buf_t *bp; |
1da177e4 | 718 | |
ce8e922c | 719 | bp = xfs_buf_allocate(0); |
1da177e4 LT |
720 | if (unlikely(bp == NULL)) |
721 | goto fail; | |
ce8e922c | 722 | _xfs_buf_initialize(bp, target, 0, len, 0); |
1da177e4 | 723 | |
1fa40b01 CH |
724 | error = _xfs_buf_get_pages(bp, page_count, 0); |
725 | if (error) | |
1da177e4 LT |
726 | goto fail_free_buf; |
727 | ||
1fa40b01 | 728 | for (i = 0; i < page_count; i++) { |
686865f7 | 729 | bp->b_pages[i] = alloc_page(xb_to_gfp(flags)); |
1fa40b01 CH |
730 | if (!bp->b_pages[i]) |
731 | goto fail_free_mem; | |
1da177e4 | 732 | } |
1fa40b01 | 733 | bp->b_flags |= _XBF_PAGES; |
1da177e4 | 734 | |
1fa40b01 CH |
735 | error = _xfs_buf_map_pages(bp, XBF_MAPPED); |
736 | if (unlikely(error)) { | |
737 | printk(KERN_WARNING "%s: failed to map pages\n", | |
34a622b2 | 738 | __func__); |
1da177e4 | 739 | goto fail_free_mem; |
1fa40b01 | 740 | } |
1da177e4 | 741 | |
ce8e922c | 742 | xfs_buf_unlock(bp); |
1da177e4 | 743 | |
686865f7 | 744 | trace_xfs_buf_get_uncached(bp, _RET_IP_); |
1da177e4 | 745 | return bp; |
1fa40b01 | 746 | |
1da177e4 | 747 | fail_free_mem: |
1fa40b01 CH |
748 | while (--i >= 0) |
749 | __free_page(bp->b_pages[i]); | |
ca165b88 | 750 | _xfs_buf_free_pages(bp); |
1da177e4 | 751 | fail_free_buf: |
ca165b88 | 752 | xfs_buf_deallocate(bp); |
1da177e4 LT |
753 | fail: |
754 | return NULL; | |
755 | } | |
756 | ||
757 | /* | |
1da177e4 LT |
758 | * Increment reference count on buffer, to hold the buffer concurrently |
759 | * with another thread which may release (free) the buffer asynchronously. | |
1da177e4 LT |
760 | * Must hold the buffer already to call this function. |
761 | */ | |
762 | void | |
ce8e922c NS |
763 | xfs_buf_hold( |
764 | xfs_buf_t *bp) | |
1da177e4 | 765 | { |
0b1b213f | 766 | trace_xfs_buf_hold(bp, _RET_IP_); |
ce8e922c | 767 | atomic_inc(&bp->b_hold); |
1da177e4 LT |
768 | } |
769 | ||
770 | /* | |
ce8e922c NS |
771 | * Releases a hold on the specified buffer. If the |
772 | * the hold count is 1, calls xfs_buf_free. | |
1da177e4 LT |
773 | */ |
774 | void | |
ce8e922c NS |
775 | xfs_buf_rele( |
776 | xfs_buf_t *bp) | |
1da177e4 | 777 | { |
ce8e922c | 778 | xfs_bufhash_t *hash = bp->b_hash; |
1da177e4 | 779 | |
0b1b213f | 780 | trace_xfs_buf_rele(bp, _RET_IP_); |
1da177e4 | 781 | |
fad3aa1e NS |
782 | if (unlikely(!hash)) { |
783 | ASSERT(!bp->b_relse); | |
784 | if (atomic_dec_and_test(&bp->b_hold)) | |
785 | xfs_buf_free(bp); | |
786 | return; | |
787 | } | |
788 | ||
3790689f | 789 | ASSERT(atomic_read(&bp->b_hold) > 0); |
ce8e922c NS |
790 | if (atomic_dec_and_lock(&bp->b_hold, &hash->bh_lock)) { |
791 | if (bp->b_relse) { | |
792 | atomic_inc(&bp->b_hold); | |
1da177e4 | 793 | spin_unlock(&hash->bh_lock); |
ce8e922c NS |
794 | (*(bp->b_relse)) (bp); |
795 | } else if (bp->b_flags & XBF_FS_MANAGED) { | |
1da177e4 | 796 | spin_unlock(&hash->bh_lock); |
1da177e4 | 797 | } else { |
ce8e922c NS |
798 | ASSERT(!(bp->b_flags & (XBF_DELWRI|_XBF_DELWRI_Q))); |
799 | list_del_init(&bp->b_hash_list); | |
1da177e4 | 800 | spin_unlock(&hash->bh_lock); |
ce8e922c | 801 | xfs_buf_free(bp); |
1da177e4 LT |
802 | } |
803 | } | |
804 | } | |
805 | ||
806 | ||
807 | /* | |
808 | * Mutual exclusion on buffers. Locking model: | |
809 | * | |
810 | * Buffers associated with inodes for which buffer locking | |
811 | * is not enabled are not protected by semaphores, and are | |
812 | * assumed to be exclusively owned by the caller. There is a | |
813 | * spinlock in the buffer, used by the caller when concurrent | |
814 | * access is possible. | |
815 | */ | |
816 | ||
817 | /* | |
ce8e922c NS |
818 | * Locks a buffer object, if it is not already locked. |
819 | * Note that this in no way locks the underlying pages, so it is only | |
820 | * useful for synchronizing concurrent use of buffer objects, not for | |
821 | * synchronizing independent access to the underlying pages. | |
1da177e4 LT |
822 | */ |
823 | int | |
ce8e922c NS |
824 | xfs_buf_cond_lock( |
825 | xfs_buf_t *bp) | |
1da177e4 LT |
826 | { |
827 | int locked; | |
828 | ||
ce8e922c | 829 | locked = down_trylock(&bp->b_sema) == 0; |
0b1b213f | 830 | if (locked) |
ce8e922c | 831 | XB_SET_OWNER(bp); |
0b1b213f CH |
832 | |
833 | trace_xfs_buf_cond_lock(bp, _RET_IP_); | |
ce8e922c | 834 | return locked ? 0 : -EBUSY; |
1da177e4 LT |
835 | } |
836 | ||
1da177e4 | 837 | int |
ce8e922c NS |
838 | xfs_buf_lock_value( |
839 | xfs_buf_t *bp) | |
1da177e4 | 840 | { |
adaa693b | 841 | return bp->b_sema.count; |
1da177e4 | 842 | } |
1da177e4 LT |
843 | |
844 | /* | |
ce8e922c NS |
845 | * Locks a buffer object. |
846 | * Note that this in no way locks the underlying pages, so it is only | |
847 | * useful for synchronizing concurrent use of buffer objects, not for | |
848 | * synchronizing independent access to the underlying pages. | |
ed3b4d6c DC |
849 | * |
850 | * If we come across a stale, pinned, locked buffer, we know that we | |
851 | * are being asked to lock a buffer that has been reallocated. Because | |
852 | * it is pinned, we know that the log has not been pushed to disk and | |
853 | * hence it will still be locked. Rather than sleeping until someone | |
854 | * else pushes the log, push it ourselves before trying to get the lock. | |
1da177e4 | 855 | */ |
ce8e922c NS |
856 | void |
857 | xfs_buf_lock( | |
858 | xfs_buf_t *bp) | |
1da177e4 | 859 | { |
0b1b213f CH |
860 | trace_xfs_buf_lock(bp, _RET_IP_); |
861 | ||
ed3b4d6c DC |
862 | if (atomic_read(&bp->b_pin_count) && (bp->b_flags & XBF_STALE)) |
863 | xfs_log_force(bp->b_mount, 0); | |
ce8e922c NS |
864 | if (atomic_read(&bp->b_io_remaining)) |
865 | blk_run_address_space(bp->b_target->bt_mapping); | |
866 | down(&bp->b_sema); | |
867 | XB_SET_OWNER(bp); | |
0b1b213f CH |
868 | |
869 | trace_xfs_buf_lock_done(bp, _RET_IP_); | |
1da177e4 LT |
870 | } |
871 | ||
872 | /* | |
ce8e922c | 873 | * Releases the lock on the buffer object. |
2f926587 | 874 | * If the buffer is marked delwri but is not queued, do so before we |
ce8e922c | 875 | * unlock the buffer as we need to set flags correctly. We also need to |
2f926587 DC |
876 | * take a reference for the delwri queue because the unlocker is going to |
877 | * drop their's and they don't know we just queued it. | |
1da177e4 LT |
878 | */ |
879 | void | |
ce8e922c NS |
880 | xfs_buf_unlock( |
881 | xfs_buf_t *bp) | |
1da177e4 | 882 | { |
ce8e922c NS |
883 | if ((bp->b_flags & (XBF_DELWRI|_XBF_DELWRI_Q)) == XBF_DELWRI) { |
884 | atomic_inc(&bp->b_hold); | |
885 | bp->b_flags |= XBF_ASYNC; | |
886 | xfs_buf_delwri_queue(bp, 0); | |
2f926587 DC |
887 | } |
888 | ||
ce8e922c NS |
889 | XB_CLEAR_OWNER(bp); |
890 | up(&bp->b_sema); | |
0b1b213f CH |
891 | |
892 | trace_xfs_buf_unlock(bp, _RET_IP_); | |
1da177e4 LT |
893 | } |
894 | ||
ce8e922c NS |
895 | STATIC void |
896 | xfs_buf_wait_unpin( | |
897 | xfs_buf_t *bp) | |
1da177e4 LT |
898 | { |
899 | DECLARE_WAITQUEUE (wait, current); | |
900 | ||
ce8e922c | 901 | if (atomic_read(&bp->b_pin_count) == 0) |
1da177e4 LT |
902 | return; |
903 | ||
ce8e922c | 904 | add_wait_queue(&bp->b_waiters, &wait); |
1da177e4 LT |
905 | for (;;) { |
906 | set_current_state(TASK_UNINTERRUPTIBLE); | |
ce8e922c | 907 | if (atomic_read(&bp->b_pin_count) == 0) |
1da177e4 | 908 | break; |
ce8e922c NS |
909 | if (atomic_read(&bp->b_io_remaining)) |
910 | blk_run_address_space(bp->b_target->bt_mapping); | |
1da177e4 LT |
911 | schedule(); |
912 | } | |
ce8e922c | 913 | remove_wait_queue(&bp->b_waiters, &wait); |
1da177e4 LT |
914 | set_current_state(TASK_RUNNING); |
915 | } | |
916 | ||
917 | /* | |
918 | * Buffer Utility Routines | |
919 | */ | |
920 | ||
1da177e4 | 921 | STATIC void |
ce8e922c | 922 | xfs_buf_iodone_work( |
c4028958 | 923 | struct work_struct *work) |
1da177e4 | 924 | { |
c4028958 DH |
925 | xfs_buf_t *bp = |
926 | container_of(work, xfs_buf_t, b_iodone_work); | |
1da177e4 | 927 | |
0bfefc46 DC |
928 | /* |
929 | * We can get an EOPNOTSUPP to ordered writes. Here we clear the | |
930 | * ordered flag and reissue them. Because we can't tell the higher | |
931 | * layers directly that they should not issue ordered I/O anymore, they | |
73f6aa4d | 932 | * need to check if the _XFS_BARRIER_FAILED flag was set during I/O completion. |
0bfefc46 DC |
933 | */ |
934 | if ((bp->b_error == EOPNOTSUPP) && | |
935 | (bp->b_flags & (XBF_ORDERED|XBF_ASYNC)) == (XBF_ORDERED|XBF_ASYNC)) { | |
0b1b213f | 936 | trace_xfs_buf_ordered_retry(bp, _RET_IP_); |
0bfefc46 | 937 | bp->b_flags &= ~XBF_ORDERED; |
73f6aa4d | 938 | bp->b_flags |= _XFS_BARRIER_FAILED; |
0bfefc46 DC |
939 | xfs_buf_iorequest(bp); |
940 | } else if (bp->b_iodone) | |
ce8e922c NS |
941 | (*(bp->b_iodone))(bp); |
942 | else if (bp->b_flags & XBF_ASYNC) | |
1da177e4 LT |
943 | xfs_buf_relse(bp); |
944 | } | |
945 | ||
946 | void | |
ce8e922c NS |
947 | xfs_buf_ioend( |
948 | xfs_buf_t *bp, | |
1da177e4 LT |
949 | int schedule) |
950 | { | |
0b1b213f CH |
951 | trace_xfs_buf_iodone(bp, _RET_IP_); |
952 | ||
77be55a5 | 953 | bp->b_flags &= ~(XBF_READ | XBF_WRITE | XBF_READ_AHEAD); |
ce8e922c NS |
954 | if (bp->b_error == 0) |
955 | bp->b_flags |= XBF_DONE; | |
1da177e4 | 956 | |
ce8e922c | 957 | if ((bp->b_iodone) || (bp->b_flags & XBF_ASYNC)) { |
1da177e4 | 958 | if (schedule) { |
c4028958 | 959 | INIT_WORK(&bp->b_iodone_work, xfs_buf_iodone_work); |
ce8e922c | 960 | queue_work(xfslogd_workqueue, &bp->b_iodone_work); |
1da177e4 | 961 | } else { |
c4028958 | 962 | xfs_buf_iodone_work(&bp->b_iodone_work); |
1da177e4 LT |
963 | } |
964 | } else { | |
b4dd330b | 965 | complete(&bp->b_iowait); |
1da177e4 LT |
966 | } |
967 | } | |
968 | ||
1da177e4 | 969 | void |
ce8e922c NS |
970 | xfs_buf_ioerror( |
971 | xfs_buf_t *bp, | |
972 | int error) | |
1da177e4 LT |
973 | { |
974 | ASSERT(error >= 0 && error <= 0xffff); | |
ce8e922c | 975 | bp->b_error = (unsigned short)error; |
0b1b213f | 976 | trace_xfs_buf_ioerror(bp, error, _RET_IP_); |
1da177e4 LT |
977 | } |
978 | ||
1da177e4 | 979 | int |
64e0bc7d CH |
980 | xfs_bwrite( |
981 | struct xfs_mount *mp, | |
5d765b97 | 982 | struct xfs_buf *bp) |
1da177e4 | 983 | { |
8c38366f | 984 | int error; |
1da177e4 | 985 | |
64e0bc7d CH |
986 | bp->b_mount = mp; |
987 | bp->b_flags |= XBF_WRITE; | |
8c38366f | 988 | bp->b_flags &= ~(XBF_ASYNC | XBF_READ); |
1da177e4 | 989 | |
5d765b97 | 990 | xfs_buf_delwri_dequeue(bp); |
939d723b | 991 | xfs_bdstrat_cb(bp); |
1da177e4 | 992 | |
8c38366f CH |
993 | error = xfs_buf_iowait(bp); |
994 | if (error) | |
995 | xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR); | |
996 | xfs_buf_relse(bp); | |
64e0bc7d | 997 | return error; |
5d765b97 | 998 | } |
1da177e4 | 999 | |
5d765b97 CH |
1000 | void |
1001 | xfs_bdwrite( | |
1002 | void *mp, | |
1003 | struct xfs_buf *bp) | |
1004 | { | |
0b1b213f | 1005 | trace_xfs_buf_bdwrite(bp, _RET_IP_); |
1da177e4 | 1006 | |
15ac08a8 | 1007 | bp->b_mount = mp; |
1da177e4 | 1008 | |
5d765b97 CH |
1009 | bp->b_flags &= ~XBF_READ; |
1010 | bp->b_flags |= (XBF_DELWRI | XBF_ASYNC); | |
1011 | ||
1012 | xfs_buf_delwri_queue(bp, 1); | |
1da177e4 LT |
1013 | } |
1014 | ||
4e23471a CH |
1015 | /* |
1016 | * Called when we want to stop a buffer from getting written or read. | |
1017 | * We attach the EIO error, muck with its flags, and call biodone | |
1018 | * so that the proper iodone callbacks get called. | |
1019 | */ | |
1020 | STATIC int | |
1021 | xfs_bioerror( | |
1022 | xfs_buf_t *bp) | |
1023 | { | |
1024 | #ifdef XFSERRORDEBUG | |
1025 | ASSERT(XFS_BUF_ISREAD(bp) || bp->b_iodone); | |
1026 | #endif | |
1027 | ||
1028 | /* | |
1029 | * No need to wait until the buffer is unpinned, we aren't flushing it. | |
1030 | */ | |
1031 | XFS_BUF_ERROR(bp, EIO); | |
1032 | ||
1033 | /* | |
1034 | * We're calling biodone, so delete XBF_DONE flag. | |
1035 | */ | |
1036 | XFS_BUF_UNREAD(bp); | |
1037 | XFS_BUF_UNDELAYWRITE(bp); | |
1038 | XFS_BUF_UNDONE(bp); | |
1039 | XFS_BUF_STALE(bp); | |
1040 | ||
4e23471a CH |
1041 | xfs_biodone(bp); |
1042 | ||
1043 | return EIO; | |
1044 | } | |
1045 | ||
1046 | /* | |
1047 | * Same as xfs_bioerror, except that we are releasing the buffer | |
1048 | * here ourselves, and avoiding the biodone call. | |
1049 | * This is meant for userdata errors; metadata bufs come with | |
1050 | * iodone functions attached, so that we can track down errors. | |
1051 | */ | |
1052 | STATIC int | |
1053 | xfs_bioerror_relse( | |
1054 | struct xfs_buf *bp) | |
1055 | { | |
1056 | int64_t fl = XFS_BUF_BFLAGS(bp); | |
1057 | /* | |
1058 | * No need to wait until the buffer is unpinned. | |
1059 | * We aren't flushing it. | |
1060 | * | |
1061 | * chunkhold expects B_DONE to be set, whether | |
1062 | * we actually finish the I/O or not. We don't want to | |
1063 | * change that interface. | |
1064 | */ | |
1065 | XFS_BUF_UNREAD(bp); | |
1066 | XFS_BUF_UNDELAYWRITE(bp); | |
1067 | XFS_BUF_DONE(bp); | |
1068 | XFS_BUF_STALE(bp); | |
1069 | XFS_BUF_CLR_IODONE_FUNC(bp); | |
0cadda1c | 1070 | if (!(fl & XBF_ASYNC)) { |
4e23471a CH |
1071 | /* |
1072 | * Mark b_error and B_ERROR _both_. | |
1073 | * Lot's of chunkcache code assumes that. | |
1074 | * There's no reason to mark error for | |
1075 | * ASYNC buffers. | |
1076 | */ | |
1077 | XFS_BUF_ERROR(bp, EIO); | |
1078 | XFS_BUF_FINISH_IOWAIT(bp); | |
1079 | } else { | |
1080 | xfs_buf_relse(bp); | |
1081 | } | |
1082 | ||
1083 | return EIO; | |
1084 | } | |
1085 | ||
1086 | ||
1087 | /* | |
1088 | * All xfs metadata buffers except log state machine buffers | |
1089 | * get this attached as their b_bdstrat callback function. | |
1090 | * This is so that we can catch a buffer | |
1091 | * after prematurely unpinning it to forcibly shutdown the filesystem. | |
1092 | */ | |
1093 | int | |
1094 | xfs_bdstrat_cb( | |
1095 | struct xfs_buf *bp) | |
1096 | { | |
1097 | if (XFS_FORCED_SHUTDOWN(bp->b_mount)) { | |
1098 | trace_xfs_bdstrat_shut(bp, _RET_IP_); | |
1099 | /* | |
1100 | * Metadata write that didn't get logged but | |
1101 | * written delayed anyway. These aren't associated | |
1102 | * with a transaction, and can be ignored. | |
1103 | */ | |
1104 | if (!bp->b_iodone && !XFS_BUF_ISREAD(bp)) | |
1105 | return xfs_bioerror_relse(bp); | |
1106 | else | |
1107 | return xfs_bioerror(bp); | |
1108 | } | |
1109 | ||
1110 | xfs_buf_iorequest(bp); | |
1111 | return 0; | |
1112 | } | |
1113 | ||
1114 | /* | |
1115 | * Wrapper around bdstrat so that we can stop data from going to disk in case | |
1116 | * we are shutting down the filesystem. Typically user data goes thru this | |
1117 | * path; one of the exceptions is the superblock. | |
1118 | */ | |
1119 | void | |
1120 | xfsbdstrat( | |
1121 | struct xfs_mount *mp, | |
1122 | struct xfs_buf *bp) | |
1123 | { | |
1124 | if (XFS_FORCED_SHUTDOWN(mp)) { | |
1125 | trace_xfs_bdstrat_shut(bp, _RET_IP_); | |
1126 | xfs_bioerror_relse(bp); | |
1127 | return; | |
1128 | } | |
1129 | ||
1130 | xfs_buf_iorequest(bp); | |
1131 | } | |
1132 | ||
b8f82a4a | 1133 | STATIC void |
ce8e922c NS |
1134 | _xfs_buf_ioend( |
1135 | xfs_buf_t *bp, | |
1da177e4 LT |
1136 | int schedule) |
1137 | { | |
6ab455ee CH |
1138 | if (atomic_dec_and_test(&bp->b_io_remaining) == 1) { |
1139 | bp->b_flags &= ~_XBF_PAGE_LOCKED; | |
ce8e922c | 1140 | xfs_buf_ioend(bp, schedule); |
6ab455ee | 1141 | } |
1da177e4 LT |
1142 | } |
1143 | ||
782e3b3b | 1144 | STATIC void |
ce8e922c | 1145 | xfs_buf_bio_end_io( |
1da177e4 | 1146 | struct bio *bio, |
1da177e4 LT |
1147 | int error) |
1148 | { | |
ce8e922c NS |
1149 | xfs_buf_t *bp = (xfs_buf_t *)bio->bi_private; |
1150 | unsigned int blocksize = bp->b_target->bt_bsize; | |
eedb5530 | 1151 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; |
1da177e4 | 1152 | |
cfbe5267 | 1153 | xfs_buf_ioerror(bp, -error); |
1da177e4 | 1154 | |
73c77e2c JB |
1155 | if (!error && xfs_buf_is_vmapped(bp) && (bp->b_flags & XBF_READ)) |
1156 | invalidate_kernel_vmap_range(bp->b_addr, xfs_buf_vmap_len(bp)); | |
1157 | ||
eedb5530 | 1158 | do { |
1da177e4 LT |
1159 | struct page *page = bvec->bv_page; |
1160 | ||
948ecdb4 | 1161 | ASSERT(!PagePrivate(page)); |
ce8e922c NS |
1162 | if (unlikely(bp->b_error)) { |
1163 | if (bp->b_flags & XBF_READ) | |
eedb5530 | 1164 | ClearPageUptodate(page); |
ce8e922c | 1165 | } else if (blocksize >= PAGE_CACHE_SIZE) { |
1da177e4 LT |
1166 | SetPageUptodate(page); |
1167 | } else if (!PagePrivate(page) && | |
ce8e922c | 1168 | (bp->b_flags & _XBF_PAGE_CACHE)) { |
1da177e4 LT |
1169 | set_page_region(page, bvec->bv_offset, bvec->bv_len); |
1170 | } | |
1171 | ||
eedb5530 NS |
1172 | if (--bvec >= bio->bi_io_vec) |
1173 | prefetchw(&bvec->bv_page->flags); | |
6ab455ee CH |
1174 | |
1175 | if (bp->b_flags & _XBF_PAGE_LOCKED) | |
1176 | unlock_page(page); | |
eedb5530 | 1177 | } while (bvec >= bio->bi_io_vec); |
1da177e4 | 1178 | |
ce8e922c | 1179 | _xfs_buf_ioend(bp, 1); |
1da177e4 | 1180 | bio_put(bio); |
1da177e4 LT |
1181 | } |
1182 | ||
1183 | STATIC void | |
ce8e922c NS |
1184 | _xfs_buf_ioapply( |
1185 | xfs_buf_t *bp) | |
1da177e4 | 1186 | { |
a9759f2d | 1187 | int rw, map_i, total_nr_pages, nr_pages; |
1da177e4 | 1188 | struct bio *bio; |
ce8e922c NS |
1189 | int offset = bp->b_offset; |
1190 | int size = bp->b_count_desired; | |
1191 | sector_t sector = bp->b_bn; | |
1192 | unsigned int blocksize = bp->b_target->bt_bsize; | |
1da177e4 | 1193 | |
ce8e922c | 1194 | total_nr_pages = bp->b_page_count; |
1da177e4 LT |
1195 | map_i = 0; |
1196 | ||
ce8e922c NS |
1197 | if (bp->b_flags & XBF_ORDERED) { |
1198 | ASSERT(!(bp->b_flags & XBF_READ)); | |
f538d4da | 1199 | rw = WRITE_BARRIER; |
2ee1abad | 1200 | } else if (bp->b_flags & XBF_LOG_BUFFER) { |
51bdd706 NS |
1201 | ASSERT(!(bp->b_flags & XBF_READ_AHEAD)); |
1202 | bp->b_flags &= ~_XBF_RUN_QUEUES; | |
1203 | rw = (bp->b_flags & XBF_WRITE) ? WRITE_SYNC : READ_SYNC; | |
2ee1abad DC |
1204 | } else if (bp->b_flags & _XBF_RUN_QUEUES) { |
1205 | ASSERT(!(bp->b_flags & XBF_READ_AHEAD)); | |
1206 | bp->b_flags &= ~_XBF_RUN_QUEUES; | |
1207 | rw = (bp->b_flags & XBF_WRITE) ? WRITE_META : READ_META; | |
51bdd706 NS |
1208 | } else { |
1209 | rw = (bp->b_flags & XBF_WRITE) ? WRITE : | |
1210 | (bp->b_flags & XBF_READ_AHEAD) ? READA : READ; | |
f538d4da CH |
1211 | } |
1212 | ||
ce8e922c | 1213 | /* Special code path for reading a sub page size buffer in -- |
1da177e4 LT |
1214 | * we populate up the whole page, and hence the other metadata |
1215 | * in the same page. This optimization is only valid when the | |
ce8e922c | 1216 | * filesystem block size is not smaller than the page size. |
1da177e4 | 1217 | */ |
ce8e922c | 1218 | if ((bp->b_buffer_length < PAGE_CACHE_SIZE) && |
6ab455ee CH |
1219 | ((bp->b_flags & (XBF_READ|_XBF_PAGE_LOCKED)) == |
1220 | (XBF_READ|_XBF_PAGE_LOCKED)) && | |
ce8e922c | 1221 | (blocksize >= PAGE_CACHE_SIZE)) { |
1da177e4 LT |
1222 | bio = bio_alloc(GFP_NOIO, 1); |
1223 | ||
ce8e922c | 1224 | bio->bi_bdev = bp->b_target->bt_bdev; |
1da177e4 | 1225 | bio->bi_sector = sector - (offset >> BBSHIFT); |
ce8e922c NS |
1226 | bio->bi_end_io = xfs_buf_bio_end_io; |
1227 | bio->bi_private = bp; | |
1da177e4 | 1228 | |
ce8e922c | 1229 | bio_add_page(bio, bp->b_pages[0], PAGE_CACHE_SIZE, 0); |
1da177e4 LT |
1230 | size = 0; |
1231 | ||
ce8e922c | 1232 | atomic_inc(&bp->b_io_remaining); |
1da177e4 LT |
1233 | |
1234 | goto submit_io; | |
1235 | } | |
1236 | ||
1da177e4 | 1237 | next_chunk: |
ce8e922c | 1238 | atomic_inc(&bp->b_io_remaining); |
1da177e4 LT |
1239 | nr_pages = BIO_MAX_SECTORS >> (PAGE_SHIFT - BBSHIFT); |
1240 | if (nr_pages > total_nr_pages) | |
1241 | nr_pages = total_nr_pages; | |
1242 | ||
1243 | bio = bio_alloc(GFP_NOIO, nr_pages); | |
ce8e922c | 1244 | bio->bi_bdev = bp->b_target->bt_bdev; |
1da177e4 | 1245 | bio->bi_sector = sector; |
ce8e922c NS |
1246 | bio->bi_end_io = xfs_buf_bio_end_io; |
1247 | bio->bi_private = bp; | |
1da177e4 LT |
1248 | |
1249 | for (; size && nr_pages; nr_pages--, map_i++) { | |
ce8e922c | 1250 | int rbytes, nbytes = PAGE_CACHE_SIZE - offset; |
1da177e4 LT |
1251 | |
1252 | if (nbytes > size) | |
1253 | nbytes = size; | |
1254 | ||
ce8e922c NS |
1255 | rbytes = bio_add_page(bio, bp->b_pages[map_i], nbytes, offset); |
1256 | if (rbytes < nbytes) | |
1da177e4 LT |
1257 | break; |
1258 | ||
1259 | offset = 0; | |
1260 | sector += nbytes >> BBSHIFT; | |
1261 | size -= nbytes; | |
1262 | total_nr_pages--; | |
1263 | } | |
1264 | ||
1265 | submit_io: | |
1266 | if (likely(bio->bi_size)) { | |
73c77e2c JB |
1267 | if (xfs_buf_is_vmapped(bp)) { |
1268 | flush_kernel_vmap_range(bp->b_addr, | |
1269 | xfs_buf_vmap_len(bp)); | |
1270 | } | |
1da177e4 LT |
1271 | submit_bio(rw, bio); |
1272 | if (size) | |
1273 | goto next_chunk; | |
1274 | } else { | |
ec53d1db DC |
1275 | /* |
1276 | * if we get here, no pages were added to the bio. However, | |
1277 | * we can't just error out here - if the pages are locked then | |
1278 | * we have to unlock them otherwise we can hang on a later | |
1279 | * access to the page. | |
1280 | */ | |
ce8e922c | 1281 | xfs_buf_ioerror(bp, EIO); |
ec53d1db DC |
1282 | if (bp->b_flags & _XBF_PAGE_LOCKED) { |
1283 | int i; | |
1284 | for (i = 0; i < bp->b_page_count; i++) | |
1285 | unlock_page(bp->b_pages[i]); | |
1286 | } | |
1287 | bio_put(bio); | |
1da177e4 LT |
1288 | } |
1289 | } | |
1290 | ||
1da177e4 | 1291 | int |
ce8e922c NS |
1292 | xfs_buf_iorequest( |
1293 | xfs_buf_t *bp) | |
1da177e4 | 1294 | { |
0b1b213f | 1295 | trace_xfs_buf_iorequest(bp, _RET_IP_); |
1da177e4 | 1296 | |
ce8e922c NS |
1297 | if (bp->b_flags & XBF_DELWRI) { |
1298 | xfs_buf_delwri_queue(bp, 1); | |
1da177e4 LT |
1299 | return 0; |
1300 | } | |
1301 | ||
ce8e922c NS |
1302 | if (bp->b_flags & XBF_WRITE) { |
1303 | xfs_buf_wait_unpin(bp); | |
1da177e4 LT |
1304 | } |
1305 | ||
ce8e922c | 1306 | xfs_buf_hold(bp); |
1da177e4 LT |
1307 | |
1308 | /* Set the count to 1 initially, this will stop an I/O | |
1309 | * completion callout which happens before we have started | |
ce8e922c | 1310 | * all the I/O from calling xfs_buf_ioend too early. |
1da177e4 | 1311 | */ |
ce8e922c NS |
1312 | atomic_set(&bp->b_io_remaining, 1); |
1313 | _xfs_buf_ioapply(bp); | |
1314 | _xfs_buf_ioend(bp, 0); | |
1da177e4 | 1315 | |
ce8e922c | 1316 | xfs_buf_rele(bp); |
1da177e4 LT |
1317 | return 0; |
1318 | } | |
1319 | ||
1320 | /* | |
ce8e922c NS |
1321 | * Waits for I/O to complete on the buffer supplied. |
1322 | * It returns immediately if no I/O is pending. | |
1323 | * It returns the I/O error code, if any, or 0 if there was no error. | |
1da177e4 LT |
1324 | */ |
1325 | int | |
ce8e922c NS |
1326 | xfs_buf_iowait( |
1327 | xfs_buf_t *bp) | |
1da177e4 | 1328 | { |
0b1b213f CH |
1329 | trace_xfs_buf_iowait(bp, _RET_IP_); |
1330 | ||
ce8e922c NS |
1331 | if (atomic_read(&bp->b_io_remaining)) |
1332 | blk_run_address_space(bp->b_target->bt_mapping); | |
b4dd330b | 1333 | wait_for_completion(&bp->b_iowait); |
0b1b213f CH |
1334 | |
1335 | trace_xfs_buf_iowait_done(bp, _RET_IP_); | |
ce8e922c | 1336 | return bp->b_error; |
1da177e4 LT |
1337 | } |
1338 | ||
ce8e922c NS |
1339 | xfs_caddr_t |
1340 | xfs_buf_offset( | |
1341 | xfs_buf_t *bp, | |
1da177e4 LT |
1342 | size_t offset) |
1343 | { | |
1344 | struct page *page; | |
1345 | ||
ce8e922c NS |
1346 | if (bp->b_flags & XBF_MAPPED) |
1347 | return XFS_BUF_PTR(bp) + offset; | |
1da177e4 | 1348 | |
ce8e922c NS |
1349 | offset += bp->b_offset; |
1350 | page = bp->b_pages[offset >> PAGE_CACHE_SHIFT]; | |
1351 | return (xfs_caddr_t)page_address(page) + (offset & (PAGE_CACHE_SIZE-1)); | |
1da177e4 LT |
1352 | } |
1353 | ||
1354 | /* | |
1da177e4 LT |
1355 | * Move data into or out of a buffer. |
1356 | */ | |
1357 | void | |
ce8e922c NS |
1358 | xfs_buf_iomove( |
1359 | xfs_buf_t *bp, /* buffer to process */ | |
1da177e4 LT |
1360 | size_t boff, /* starting buffer offset */ |
1361 | size_t bsize, /* length to copy */ | |
b9c48649 | 1362 | void *data, /* data address */ |
ce8e922c | 1363 | xfs_buf_rw_t mode) /* read/write/zero flag */ |
1da177e4 LT |
1364 | { |
1365 | size_t bend, cpoff, csize; | |
1366 | struct page *page; | |
1367 | ||
1368 | bend = boff + bsize; | |
1369 | while (boff < bend) { | |
ce8e922c NS |
1370 | page = bp->b_pages[xfs_buf_btoct(boff + bp->b_offset)]; |
1371 | cpoff = xfs_buf_poff(boff + bp->b_offset); | |
1da177e4 | 1372 | csize = min_t(size_t, |
ce8e922c | 1373 | PAGE_CACHE_SIZE-cpoff, bp->b_count_desired-boff); |
1da177e4 LT |
1374 | |
1375 | ASSERT(((csize + cpoff) <= PAGE_CACHE_SIZE)); | |
1376 | ||
1377 | switch (mode) { | |
ce8e922c | 1378 | case XBRW_ZERO: |
1da177e4 LT |
1379 | memset(page_address(page) + cpoff, 0, csize); |
1380 | break; | |
ce8e922c | 1381 | case XBRW_READ: |
1da177e4 LT |
1382 | memcpy(data, page_address(page) + cpoff, csize); |
1383 | break; | |
ce8e922c | 1384 | case XBRW_WRITE: |
1da177e4 LT |
1385 | memcpy(page_address(page) + cpoff, data, csize); |
1386 | } | |
1387 | ||
1388 | boff += csize; | |
1389 | data += csize; | |
1390 | } | |
1391 | } | |
1392 | ||
1393 | /* | |
ce8e922c | 1394 | * Handling of buffer targets (buftargs). |
1da177e4 LT |
1395 | */ |
1396 | ||
1397 | /* | |
ce8e922c NS |
1398 | * Wait for any bufs with callbacks that have been submitted but |
1399 | * have not yet returned... walk the hash list for the target. | |
1da177e4 LT |
1400 | */ |
1401 | void | |
1402 | xfs_wait_buftarg( | |
1403 | xfs_buftarg_t *btp) | |
1404 | { | |
1405 | xfs_buf_t *bp, *n; | |
1406 | xfs_bufhash_t *hash; | |
1407 | uint i; | |
1408 | ||
1409 | for (i = 0; i < (1 << btp->bt_hashshift); i++) { | |
1410 | hash = &btp->bt_hash[i]; | |
1411 | again: | |
1412 | spin_lock(&hash->bh_lock); | |
ce8e922c NS |
1413 | list_for_each_entry_safe(bp, n, &hash->bh_list, b_hash_list) { |
1414 | ASSERT(btp == bp->b_target); | |
1415 | if (!(bp->b_flags & XBF_FS_MANAGED)) { | |
1da177e4 | 1416 | spin_unlock(&hash->bh_lock); |
2f926587 DC |
1417 | /* |
1418 | * Catch superblock reference count leaks | |
1419 | * immediately | |
1420 | */ | |
ce8e922c | 1421 | BUG_ON(bp->b_bn == 0); |
1da177e4 LT |
1422 | delay(100); |
1423 | goto again; | |
1424 | } | |
1425 | } | |
1426 | spin_unlock(&hash->bh_lock); | |
1427 | } | |
1428 | } | |
1429 | ||
1430 | /* | |
ce8e922c NS |
1431 | * Allocate buffer hash table for a given target. |
1432 | * For devices containing metadata (i.e. not the log/realtime devices) | |
1433 | * we need to allocate a much larger hash table. | |
1da177e4 LT |
1434 | */ |
1435 | STATIC void | |
1436 | xfs_alloc_bufhash( | |
1437 | xfs_buftarg_t *btp, | |
1438 | int external) | |
1439 | { | |
1440 | unsigned int i; | |
1441 | ||
9bc08a45 | 1442 | btp->bt_hashshift = external ? 3 : 12; /* 8 or 4096 buckets */ |
bdfb0430 CH |
1443 | btp->bt_hash = kmem_zalloc_large((1 << btp->bt_hashshift) * |
1444 | sizeof(xfs_bufhash_t)); | |
1da177e4 LT |
1445 | for (i = 0; i < (1 << btp->bt_hashshift); i++) { |
1446 | spin_lock_init(&btp->bt_hash[i].bh_lock); | |
1447 | INIT_LIST_HEAD(&btp->bt_hash[i].bh_list); | |
1448 | } | |
1449 | } | |
1450 | ||
1451 | STATIC void | |
1452 | xfs_free_bufhash( | |
1453 | xfs_buftarg_t *btp) | |
1454 | { | |
bdfb0430 | 1455 | kmem_free_large(btp->bt_hash); |
1da177e4 LT |
1456 | btp->bt_hash = NULL; |
1457 | } | |
1458 | ||
a6867a68 | 1459 | /* |
ce8e922c | 1460 | * buftarg list for delwrite queue processing |
a6867a68 | 1461 | */ |
e6a0e9cd | 1462 | static LIST_HEAD(xfs_buftarg_list); |
7989cb8e | 1463 | static DEFINE_SPINLOCK(xfs_buftarg_lock); |
a6867a68 DC |
1464 | |
1465 | STATIC void | |
1466 | xfs_register_buftarg( | |
1467 | xfs_buftarg_t *btp) | |
1468 | { | |
1469 | spin_lock(&xfs_buftarg_lock); | |
1470 | list_add(&btp->bt_list, &xfs_buftarg_list); | |
1471 | spin_unlock(&xfs_buftarg_lock); | |
1472 | } | |
1473 | ||
1474 | STATIC void | |
1475 | xfs_unregister_buftarg( | |
1476 | xfs_buftarg_t *btp) | |
1477 | { | |
1478 | spin_lock(&xfs_buftarg_lock); | |
1479 | list_del(&btp->bt_list); | |
1480 | spin_unlock(&xfs_buftarg_lock); | |
1481 | } | |
1482 | ||
1da177e4 LT |
1483 | void |
1484 | xfs_free_buftarg( | |
b7963133 CH |
1485 | struct xfs_mount *mp, |
1486 | struct xfs_buftarg *btp) | |
1da177e4 LT |
1487 | { |
1488 | xfs_flush_buftarg(btp, 1); | |
b7963133 CH |
1489 | if (mp->m_flags & XFS_MOUNT_BARRIER) |
1490 | xfs_blkdev_issue_flush(btp); | |
1da177e4 | 1491 | xfs_free_bufhash(btp); |
ce8e922c | 1492 | iput(btp->bt_mapping->host); |
a6867a68 | 1493 | |
ce8e922c NS |
1494 | /* Unregister the buftarg first so that we don't get a |
1495 | * wakeup finding a non-existent task | |
1496 | */ | |
a6867a68 DC |
1497 | xfs_unregister_buftarg(btp); |
1498 | kthread_stop(btp->bt_task); | |
1499 | ||
f0e2d93c | 1500 | kmem_free(btp); |
1da177e4 LT |
1501 | } |
1502 | ||
1da177e4 LT |
1503 | STATIC int |
1504 | xfs_setsize_buftarg_flags( | |
1505 | xfs_buftarg_t *btp, | |
1506 | unsigned int blocksize, | |
1507 | unsigned int sectorsize, | |
1508 | int verbose) | |
1509 | { | |
ce8e922c NS |
1510 | btp->bt_bsize = blocksize; |
1511 | btp->bt_sshift = ffs(sectorsize) - 1; | |
1512 | btp->bt_smask = sectorsize - 1; | |
1da177e4 | 1513 | |
ce8e922c | 1514 | if (set_blocksize(btp->bt_bdev, sectorsize)) { |
1da177e4 LT |
1515 | printk(KERN_WARNING |
1516 | "XFS: Cannot set_blocksize to %u on device %s\n", | |
1517 | sectorsize, XFS_BUFTARG_NAME(btp)); | |
1518 | return EINVAL; | |
1519 | } | |
1520 | ||
1521 | if (verbose && | |
1522 | (PAGE_CACHE_SIZE / BITS_PER_LONG) > sectorsize) { | |
1523 | printk(KERN_WARNING | |
1524 | "XFS: %u byte sectors in use on device %s. " | |
1525 | "This is suboptimal; %u or greater is ideal.\n", | |
1526 | sectorsize, XFS_BUFTARG_NAME(btp), | |
1527 | (unsigned int)PAGE_CACHE_SIZE / BITS_PER_LONG); | |
1528 | } | |
1529 | ||
1530 | return 0; | |
1531 | } | |
1532 | ||
1533 | /* | |
ce8e922c NS |
1534 | * When allocating the initial buffer target we have not yet |
1535 | * read in the superblock, so don't know what sized sectors | |
1536 | * are being used is at this early stage. Play safe. | |
1537 | */ | |
1da177e4 LT |
1538 | STATIC int |
1539 | xfs_setsize_buftarg_early( | |
1540 | xfs_buftarg_t *btp, | |
1541 | struct block_device *bdev) | |
1542 | { | |
1543 | return xfs_setsize_buftarg_flags(btp, | |
e1defc4f | 1544 | PAGE_CACHE_SIZE, bdev_logical_block_size(bdev), 0); |
1da177e4 LT |
1545 | } |
1546 | ||
1547 | int | |
1548 | xfs_setsize_buftarg( | |
1549 | xfs_buftarg_t *btp, | |
1550 | unsigned int blocksize, | |
1551 | unsigned int sectorsize) | |
1552 | { | |
1553 | return xfs_setsize_buftarg_flags(btp, blocksize, sectorsize, 1); | |
1554 | } | |
1555 | ||
1556 | STATIC int | |
1557 | xfs_mapping_buftarg( | |
1558 | xfs_buftarg_t *btp, | |
1559 | struct block_device *bdev) | |
1560 | { | |
1561 | struct backing_dev_info *bdi; | |
1562 | struct inode *inode; | |
1563 | struct address_space *mapping; | |
f5e54d6e | 1564 | static const struct address_space_operations mapping_aops = { |
1da177e4 | 1565 | .sync_page = block_sync_page, |
e965f963 | 1566 | .migratepage = fail_migrate_page, |
1da177e4 LT |
1567 | }; |
1568 | ||
1569 | inode = new_inode(bdev->bd_inode->i_sb); | |
1570 | if (!inode) { | |
1571 | printk(KERN_WARNING | |
1572 | "XFS: Cannot allocate mapping inode for device %s\n", | |
1573 | XFS_BUFTARG_NAME(btp)); | |
1574 | return ENOMEM; | |
1575 | } | |
1576 | inode->i_mode = S_IFBLK; | |
1577 | inode->i_bdev = bdev; | |
1578 | inode->i_rdev = bdev->bd_dev; | |
1579 | bdi = blk_get_backing_dev_info(bdev); | |
1580 | if (!bdi) | |
1581 | bdi = &default_backing_dev_info; | |
1582 | mapping = &inode->i_data; | |
1583 | mapping->a_ops = &mapping_aops; | |
1584 | mapping->backing_dev_info = bdi; | |
1585 | mapping_set_gfp_mask(mapping, GFP_NOFS); | |
ce8e922c | 1586 | btp->bt_mapping = mapping; |
1da177e4 LT |
1587 | return 0; |
1588 | } | |
1589 | ||
a6867a68 DC |
1590 | STATIC int |
1591 | xfs_alloc_delwrite_queue( | |
e2a07812 JE |
1592 | xfs_buftarg_t *btp, |
1593 | const char *fsname) | |
a6867a68 DC |
1594 | { |
1595 | int error = 0; | |
1596 | ||
1597 | INIT_LIST_HEAD(&btp->bt_list); | |
1598 | INIT_LIST_HEAD(&btp->bt_delwrite_queue); | |
007c61c6 | 1599 | spin_lock_init(&btp->bt_delwrite_lock); |
a6867a68 | 1600 | btp->bt_flags = 0; |
e2a07812 | 1601 | btp->bt_task = kthread_run(xfsbufd, btp, "xfsbufd/%s", fsname); |
a6867a68 DC |
1602 | if (IS_ERR(btp->bt_task)) { |
1603 | error = PTR_ERR(btp->bt_task); | |
1604 | goto out_error; | |
1605 | } | |
1606 | xfs_register_buftarg(btp); | |
1607 | out_error: | |
1608 | return error; | |
1609 | } | |
1610 | ||
1da177e4 LT |
1611 | xfs_buftarg_t * |
1612 | xfs_alloc_buftarg( | |
1613 | struct block_device *bdev, | |
e2a07812 JE |
1614 | int external, |
1615 | const char *fsname) | |
1da177e4 LT |
1616 | { |
1617 | xfs_buftarg_t *btp; | |
1618 | ||
1619 | btp = kmem_zalloc(sizeof(*btp), KM_SLEEP); | |
1620 | ||
ce8e922c NS |
1621 | btp->bt_dev = bdev->bd_dev; |
1622 | btp->bt_bdev = bdev; | |
1da177e4 LT |
1623 | if (xfs_setsize_buftarg_early(btp, bdev)) |
1624 | goto error; | |
1625 | if (xfs_mapping_buftarg(btp, bdev)) | |
1626 | goto error; | |
e2a07812 | 1627 | if (xfs_alloc_delwrite_queue(btp, fsname)) |
a6867a68 | 1628 | goto error; |
1da177e4 LT |
1629 | xfs_alloc_bufhash(btp, external); |
1630 | return btp; | |
1631 | ||
1632 | error: | |
f0e2d93c | 1633 | kmem_free(btp); |
1da177e4 LT |
1634 | return NULL; |
1635 | } | |
1636 | ||
1637 | ||
1638 | /* | |
ce8e922c | 1639 | * Delayed write buffer handling |
1da177e4 | 1640 | */ |
1da177e4 | 1641 | STATIC void |
ce8e922c NS |
1642 | xfs_buf_delwri_queue( |
1643 | xfs_buf_t *bp, | |
1da177e4 LT |
1644 | int unlock) |
1645 | { | |
ce8e922c NS |
1646 | struct list_head *dwq = &bp->b_target->bt_delwrite_queue; |
1647 | spinlock_t *dwlk = &bp->b_target->bt_delwrite_lock; | |
a6867a68 | 1648 | |
0b1b213f CH |
1649 | trace_xfs_buf_delwri_queue(bp, _RET_IP_); |
1650 | ||
ce8e922c | 1651 | ASSERT((bp->b_flags&(XBF_DELWRI|XBF_ASYNC)) == (XBF_DELWRI|XBF_ASYNC)); |
1da177e4 | 1652 | |
a6867a68 | 1653 | spin_lock(dwlk); |
1da177e4 | 1654 | /* If already in the queue, dequeue and place at tail */ |
ce8e922c NS |
1655 | if (!list_empty(&bp->b_list)) { |
1656 | ASSERT(bp->b_flags & _XBF_DELWRI_Q); | |
1657 | if (unlock) | |
1658 | atomic_dec(&bp->b_hold); | |
1659 | list_del(&bp->b_list); | |
1da177e4 LT |
1660 | } |
1661 | ||
c9c12971 DC |
1662 | if (list_empty(dwq)) { |
1663 | /* start xfsbufd as it is about to have something to do */ | |
1664 | wake_up_process(bp->b_target->bt_task); | |
1665 | } | |
1666 | ||
ce8e922c NS |
1667 | bp->b_flags |= _XBF_DELWRI_Q; |
1668 | list_add_tail(&bp->b_list, dwq); | |
1669 | bp->b_queuetime = jiffies; | |
a6867a68 | 1670 | spin_unlock(dwlk); |
1da177e4 LT |
1671 | |
1672 | if (unlock) | |
ce8e922c | 1673 | xfs_buf_unlock(bp); |
1da177e4 LT |
1674 | } |
1675 | ||
1676 | void | |
ce8e922c NS |
1677 | xfs_buf_delwri_dequeue( |
1678 | xfs_buf_t *bp) | |
1da177e4 | 1679 | { |
ce8e922c | 1680 | spinlock_t *dwlk = &bp->b_target->bt_delwrite_lock; |
1da177e4 LT |
1681 | int dequeued = 0; |
1682 | ||
a6867a68 | 1683 | spin_lock(dwlk); |
ce8e922c NS |
1684 | if ((bp->b_flags & XBF_DELWRI) && !list_empty(&bp->b_list)) { |
1685 | ASSERT(bp->b_flags & _XBF_DELWRI_Q); | |
1686 | list_del_init(&bp->b_list); | |
1da177e4 LT |
1687 | dequeued = 1; |
1688 | } | |
ce8e922c | 1689 | bp->b_flags &= ~(XBF_DELWRI|_XBF_DELWRI_Q); |
a6867a68 | 1690 | spin_unlock(dwlk); |
1da177e4 LT |
1691 | |
1692 | if (dequeued) | |
ce8e922c | 1693 | xfs_buf_rele(bp); |
1da177e4 | 1694 | |
0b1b213f | 1695 | trace_xfs_buf_delwri_dequeue(bp, _RET_IP_); |
1da177e4 LT |
1696 | } |
1697 | ||
d808f617 DC |
1698 | /* |
1699 | * If a delwri buffer needs to be pushed before it has aged out, then promote | |
1700 | * it to the head of the delwri queue so that it will be flushed on the next | |
1701 | * xfsbufd run. We do this by resetting the queuetime of the buffer to be older | |
1702 | * than the age currently needed to flush the buffer. Hence the next time the | |
1703 | * xfsbufd sees it is guaranteed to be considered old enough to flush. | |
1704 | */ | |
1705 | void | |
1706 | xfs_buf_delwri_promote( | |
1707 | struct xfs_buf *bp) | |
1708 | { | |
1709 | struct xfs_buftarg *btp = bp->b_target; | |
1710 | long age = xfs_buf_age_centisecs * msecs_to_jiffies(10) + 1; | |
1711 | ||
1712 | ASSERT(bp->b_flags & XBF_DELWRI); | |
1713 | ASSERT(bp->b_flags & _XBF_DELWRI_Q); | |
1714 | ||
1715 | /* | |
1716 | * Check the buffer age before locking the delayed write queue as we | |
1717 | * don't need to promote buffers that are already past the flush age. | |
1718 | */ | |
1719 | if (bp->b_queuetime < jiffies - age) | |
1720 | return; | |
1721 | bp->b_queuetime = jiffies - age; | |
1722 | spin_lock(&btp->bt_delwrite_lock); | |
1723 | list_move(&bp->b_list, &btp->bt_delwrite_queue); | |
1724 | spin_unlock(&btp->bt_delwrite_lock); | |
1725 | } | |
1726 | ||
1da177e4 | 1727 | STATIC void |
ce8e922c | 1728 | xfs_buf_runall_queues( |
1da177e4 LT |
1729 | struct workqueue_struct *queue) |
1730 | { | |
1731 | flush_workqueue(queue); | |
1732 | } | |
1733 | ||
1da177e4 | 1734 | STATIC int |
23ea4032 | 1735 | xfsbufd_wakeup( |
7f8275d0 | 1736 | struct shrinker *shrink, |
15c84a47 NS |
1737 | int priority, |
1738 | gfp_t mask) | |
1da177e4 | 1739 | { |
da7f93e9 | 1740 | xfs_buftarg_t *btp; |
a6867a68 DC |
1741 | |
1742 | spin_lock(&xfs_buftarg_lock); | |
da7f93e9 | 1743 | list_for_each_entry(btp, &xfs_buftarg_list, bt_list) { |
ce8e922c | 1744 | if (test_bit(XBT_FORCE_SLEEP, &btp->bt_flags)) |
a6867a68 | 1745 | continue; |
c9c12971 DC |
1746 | if (list_empty(&btp->bt_delwrite_queue)) |
1747 | continue; | |
ce8e922c | 1748 | set_bit(XBT_FORCE_FLUSH, &btp->bt_flags); |
a6867a68 DC |
1749 | wake_up_process(btp->bt_task); |
1750 | } | |
1751 | spin_unlock(&xfs_buftarg_lock); | |
1da177e4 LT |
1752 | return 0; |
1753 | } | |
1754 | ||
585e6d88 DC |
1755 | /* |
1756 | * Move as many buffers as specified to the supplied list | |
1757 | * idicating if we skipped any buffers to prevent deadlocks. | |
1758 | */ | |
1759 | STATIC int | |
1760 | xfs_buf_delwri_split( | |
1761 | xfs_buftarg_t *target, | |
1762 | struct list_head *list, | |
5e6a07df | 1763 | unsigned long age) |
585e6d88 DC |
1764 | { |
1765 | xfs_buf_t *bp, *n; | |
1766 | struct list_head *dwq = &target->bt_delwrite_queue; | |
1767 | spinlock_t *dwlk = &target->bt_delwrite_lock; | |
1768 | int skipped = 0; | |
5e6a07df | 1769 | int force; |
585e6d88 | 1770 | |
5e6a07df | 1771 | force = test_and_clear_bit(XBT_FORCE_FLUSH, &target->bt_flags); |
585e6d88 DC |
1772 | INIT_LIST_HEAD(list); |
1773 | spin_lock(dwlk); | |
1774 | list_for_each_entry_safe(bp, n, dwq, b_list) { | |
0b1b213f | 1775 | trace_xfs_buf_delwri_split(bp, _RET_IP_); |
585e6d88 DC |
1776 | ASSERT(bp->b_flags & XBF_DELWRI); |
1777 | ||
4d16e924 | 1778 | if (!XFS_BUF_ISPINNED(bp) && !xfs_buf_cond_lock(bp)) { |
5e6a07df | 1779 | if (!force && |
585e6d88 DC |
1780 | time_before(jiffies, bp->b_queuetime + age)) { |
1781 | xfs_buf_unlock(bp); | |
1782 | break; | |
1783 | } | |
1784 | ||
1785 | bp->b_flags &= ~(XBF_DELWRI|_XBF_DELWRI_Q| | |
1786 | _XBF_RUN_QUEUES); | |
1787 | bp->b_flags |= XBF_WRITE; | |
1788 | list_move_tail(&bp->b_list, list); | |
1789 | } else | |
1790 | skipped++; | |
1791 | } | |
1792 | spin_unlock(dwlk); | |
1793 | ||
1794 | return skipped; | |
1795 | ||
1796 | } | |
1797 | ||
089716aa DC |
1798 | /* |
1799 | * Compare function is more complex than it needs to be because | |
1800 | * the return value is only 32 bits and we are doing comparisons | |
1801 | * on 64 bit values | |
1802 | */ | |
1803 | static int | |
1804 | xfs_buf_cmp( | |
1805 | void *priv, | |
1806 | struct list_head *a, | |
1807 | struct list_head *b) | |
1808 | { | |
1809 | struct xfs_buf *ap = container_of(a, struct xfs_buf, b_list); | |
1810 | struct xfs_buf *bp = container_of(b, struct xfs_buf, b_list); | |
1811 | xfs_daddr_t diff; | |
1812 | ||
1813 | diff = ap->b_bn - bp->b_bn; | |
1814 | if (diff < 0) | |
1815 | return -1; | |
1816 | if (diff > 0) | |
1817 | return 1; | |
1818 | return 0; | |
1819 | } | |
1820 | ||
1821 | void | |
1822 | xfs_buf_delwri_sort( | |
1823 | xfs_buftarg_t *target, | |
1824 | struct list_head *list) | |
1825 | { | |
1826 | list_sort(NULL, list, xfs_buf_cmp); | |
1827 | } | |
1828 | ||
1da177e4 | 1829 | STATIC int |
23ea4032 | 1830 | xfsbufd( |
585e6d88 | 1831 | void *data) |
1da177e4 | 1832 | { |
089716aa | 1833 | xfs_buftarg_t *target = (xfs_buftarg_t *)data; |
1da177e4 | 1834 | |
1da177e4 LT |
1835 | current->flags |= PF_MEMALLOC; |
1836 | ||
978c7b2f RW |
1837 | set_freezable(); |
1838 | ||
1da177e4 | 1839 | do { |
c9c12971 DC |
1840 | long age = xfs_buf_age_centisecs * msecs_to_jiffies(10); |
1841 | long tout = xfs_buf_timer_centisecs * msecs_to_jiffies(10); | |
089716aa DC |
1842 | int count = 0; |
1843 | struct list_head tmp; | |
c9c12971 | 1844 | |
3e1d1d28 | 1845 | if (unlikely(freezing(current))) { |
ce8e922c | 1846 | set_bit(XBT_FORCE_SLEEP, &target->bt_flags); |
3e1d1d28 | 1847 | refrigerator(); |
abd0cf7a | 1848 | } else { |
ce8e922c | 1849 | clear_bit(XBT_FORCE_SLEEP, &target->bt_flags); |
abd0cf7a | 1850 | } |
1da177e4 | 1851 | |
c9c12971 DC |
1852 | /* sleep for a long time if there is nothing to do. */ |
1853 | if (list_empty(&target->bt_delwrite_queue)) | |
1854 | tout = MAX_SCHEDULE_TIMEOUT; | |
1855 | schedule_timeout_interruptible(tout); | |
1da177e4 | 1856 | |
c9c12971 | 1857 | xfs_buf_delwri_split(target, &tmp, age); |
089716aa | 1858 | list_sort(NULL, &tmp, xfs_buf_cmp); |
1da177e4 | 1859 | while (!list_empty(&tmp)) { |
089716aa DC |
1860 | struct xfs_buf *bp; |
1861 | bp = list_first_entry(&tmp, struct xfs_buf, b_list); | |
ce8e922c | 1862 | list_del_init(&bp->b_list); |
939d723b | 1863 | xfs_bdstrat_cb(bp); |
585e6d88 | 1864 | count++; |
1da177e4 | 1865 | } |
f07c2250 NS |
1866 | if (count) |
1867 | blk_run_address_space(target->bt_mapping); | |
1da177e4 | 1868 | |
4df08c52 | 1869 | } while (!kthread_should_stop()); |
1da177e4 | 1870 | |
4df08c52 | 1871 | return 0; |
1da177e4 LT |
1872 | } |
1873 | ||
1874 | /* | |
ce8e922c NS |
1875 | * Go through all incore buffers, and release buffers if they belong to |
1876 | * the given device. This is used in filesystem error handling to | |
1877 | * preserve the consistency of its metadata. | |
1da177e4 LT |
1878 | */ |
1879 | int | |
1880 | xfs_flush_buftarg( | |
585e6d88 DC |
1881 | xfs_buftarg_t *target, |
1882 | int wait) | |
1da177e4 | 1883 | { |
089716aa | 1884 | xfs_buf_t *bp; |
585e6d88 | 1885 | int pincount = 0; |
089716aa DC |
1886 | LIST_HEAD(tmp_list); |
1887 | LIST_HEAD(wait_list); | |
1da177e4 | 1888 | |
c626d174 | 1889 | xfs_buf_runall_queues(xfsconvertd_workqueue); |
ce8e922c NS |
1890 | xfs_buf_runall_queues(xfsdatad_workqueue); |
1891 | xfs_buf_runall_queues(xfslogd_workqueue); | |
1da177e4 | 1892 | |
5e6a07df | 1893 | set_bit(XBT_FORCE_FLUSH, &target->bt_flags); |
089716aa | 1894 | pincount = xfs_buf_delwri_split(target, &tmp_list, 0); |
1da177e4 LT |
1895 | |
1896 | /* | |
089716aa DC |
1897 | * Dropped the delayed write list lock, now walk the temporary list. |
1898 | * All I/O is issued async and then if we need to wait for completion | |
1899 | * we do that after issuing all the IO. | |
1da177e4 | 1900 | */ |
089716aa DC |
1901 | list_sort(NULL, &tmp_list, xfs_buf_cmp); |
1902 | while (!list_empty(&tmp_list)) { | |
1903 | bp = list_first_entry(&tmp_list, struct xfs_buf, b_list); | |
585e6d88 | 1904 | ASSERT(target == bp->b_target); |
089716aa DC |
1905 | list_del_init(&bp->b_list); |
1906 | if (wait) { | |
ce8e922c | 1907 | bp->b_flags &= ~XBF_ASYNC; |
089716aa DC |
1908 | list_add(&bp->b_list, &wait_list); |
1909 | } | |
939d723b | 1910 | xfs_bdstrat_cb(bp); |
1da177e4 LT |
1911 | } |
1912 | ||
089716aa DC |
1913 | if (wait) { |
1914 | /* Expedite and wait for IO to complete. */ | |
f07c2250 | 1915 | blk_run_address_space(target->bt_mapping); |
089716aa DC |
1916 | while (!list_empty(&wait_list)) { |
1917 | bp = list_first_entry(&wait_list, struct xfs_buf, b_list); | |
f07c2250 | 1918 | |
089716aa DC |
1919 | list_del_init(&bp->b_list); |
1920 | xfs_iowait(bp); | |
1921 | xfs_buf_relse(bp); | |
1922 | } | |
1da177e4 LT |
1923 | } |
1924 | ||
1da177e4 LT |
1925 | return pincount; |
1926 | } | |
1927 | ||
04d8b284 | 1928 | int __init |
ce8e922c | 1929 | xfs_buf_init(void) |
1da177e4 | 1930 | { |
8758280f NS |
1931 | xfs_buf_zone = kmem_zone_init_flags(sizeof(xfs_buf_t), "xfs_buf", |
1932 | KM_ZONE_HWALIGN, NULL); | |
ce8e922c | 1933 | if (!xfs_buf_zone) |
0b1b213f | 1934 | goto out; |
04d8b284 | 1935 | |
51749e47 DC |
1936 | xfslogd_workqueue = alloc_workqueue("xfslogd", |
1937 | WQ_RESCUER | WQ_HIGHPRI, 1); | |
23ea4032 | 1938 | if (!xfslogd_workqueue) |
04d8b284 | 1939 | goto out_free_buf_zone; |
1da177e4 | 1940 | |
b4337692 | 1941 | xfsdatad_workqueue = create_workqueue("xfsdatad"); |
23ea4032 CH |
1942 | if (!xfsdatad_workqueue) |
1943 | goto out_destroy_xfslogd_workqueue; | |
1da177e4 | 1944 | |
c626d174 DC |
1945 | xfsconvertd_workqueue = create_workqueue("xfsconvertd"); |
1946 | if (!xfsconvertd_workqueue) | |
1947 | goto out_destroy_xfsdatad_workqueue; | |
1948 | ||
8e1f936b | 1949 | register_shrinker(&xfs_buf_shake); |
23ea4032 | 1950 | return 0; |
1da177e4 | 1951 | |
c626d174 DC |
1952 | out_destroy_xfsdatad_workqueue: |
1953 | destroy_workqueue(xfsdatad_workqueue); | |
23ea4032 CH |
1954 | out_destroy_xfslogd_workqueue: |
1955 | destroy_workqueue(xfslogd_workqueue); | |
23ea4032 | 1956 | out_free_buf_zone: |
ce8e922c | 1957 | kmem_zone_destroy(xfs_buf_zone); |
0b1b213f | 1958 | out: |
8758280f | 1959 | return -ENOMEM; |
1da177e4 LT |
1960 | } |
1961 | ||
1da177e4 | 1962 | void |
ce8e922c | 1963 | xfs_buf_terminate(void) |
1da177e4 | 1964 | { |
8e1f936b | 1965 | unregister_shrinker(&xfs_buf_shake); |
c626d174 | 1966 | destroy_workqueue(xfsconvertd_workqueue); |
04d8b284 CH |
1967 | destroy_workqueue(xfsdatad_workqueue); |
1968 | destroy_workqueue(xfslogd_workqueue); | |
ce8e922c | 1969 | kmem_zone_destroy(xfs_buf_zone); |
1da177e4 | 1970 | } |
e6a0e9cd TS |
1971 | |
1972 | #ifdef CONFIG_KDB_MODULES | |
1973 | struct list_head * | |
1974 | xfs_get_buftarg_list(void) | |
1975 | { | |
1976 | return &xfs_buftarg_list; | |
1977 | } | |
1978 | #endif |