2 * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
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
7 * published by the Free Software Foundation.
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.
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
20 #include "xfs_types.h"
23 #include "xfs_trans.h"
24 #include "xfs_buf_item.h"
27 #include "xfs_mount.h"
28 #include "xfs_trans_priv.h"
29 #include "xfs_extfree_item.h"
32 kmem_zone_t *xfs_efi_zone;
33 kmem_zone_t *xfs_efd_zone;
35 STATIC void xfs_efi_item_unlock(xfs_efi_log_item_t *);
38 xfs_efi_item_free(xfs_efi_log_item_t *efip)
40 int nexts = efip->efi_format.efi_nextents;
42 if (nexts > XFS_EFI_MAX_FAST_EXTENTS) {
45 kmem_zone_free(xfs_efi_zone, efip);
50 * This returns the number of iovecs needed to log the given efi item.
51 * We only need 1 iovec for an efi item. It just logs the efi_log_format
56 xfs_efi_item_size(xfs_efi_log_item_t *efip)
62 * This is called to fill in the vector of log iovecs for the
63 * given efi log item. We use only 1 iovec, and we point that
64 * at the efi_log_format structure embedded in the efi item.
65 * It is at this point that we assert that all of the extent
66 * slots in the efi item have been filled.
69 xfs_efi_item_format(xfs_efi_log_item_t *efip,
70 xfs_log_iovec_t *log_vector)
74 ASSERT(efip->efi_next_extent == efip->efi_format.efi_nextents);
76 efip->efi_format.efi_type = XFS_LI_EFI;
78 size = sizeof(xfs_efi_log_format_t);
79 size += (efip->efi_format.efi_nextents - 1) * sizeof(xfs_extent_t);
80 efip->efi_format.efi_size = 1;
82 log_vector->i_addr = (xfs_caddr_t)&(efip->efi_format);
83 log_vector->i_len = size;
84 log_vector->i_type = XLOG_REG_TYPE_EFI_FORMAT;
85 ASSERT(size >= sizeof(xfs_efi_log_format_t));
90 * Pinning has no meaning for an efi item, so just return.
94 xfs_efi_item_pin(xfs_efi_log_item_t *efip)
101 * While EFIs cannot really be pinned, the unpin operation is the
102 * last place at which the EFI is manipulated during a transaction.
103 * Here we coordinate with xfs_efi_cancel() to determine who gets to
108 xfs_efi_item_unpin(xfs_efi_log_item_t *efip)
110 struct xfs_ail *ailp = efip->efi_item.li_ailp;
112 spin_lock(&ailp->xa_lock);
113 if (efip->efi_flags & XFS_EFI_CANCELED) {
114 /* xfs_trans_ail_delete() drops the AIL lock. */
115 xfs_trans_ail_delete(ailp, (xfs_log_item_t *)efip);
116 xfs_efi_item_free(efip);
118 efip->efi_flags |= XFS_EFI_COMMITTED;
119 spin_unlock(&ailp->xa_lock);
124 * like unpin only we have to also clear the xaction descriptor
125 * pointing the log item if we free the item. This routine duplicates
126 * unpin because efi_flags is protected by the AIL lock. Freeing
127 * the descriptor and then calling unpin would force us to drop the AIL
128 * lock which would open up a race condition.
131 xfs_efi_item_unpin_remove(xfs_efi_log_item_t *efip, xfs_trans_t *tp)
133 struct xfs_ail *ailp = efip->efi_item.li_ailp;
134 xfs_log_item_desc_t *lidp;
136 spin_lock(&ailp->xa_lock);
137 if (efip->efi_flags & XFS_EFI_CANCELED) {
139 * free the xaction descriptor pointing to this item
141 lidp = xfs_trans_find_item(tp, (xfs_log_item_t *) efip);
142 xfs_trans_free_item(tp, lidp);
144 /* xfs_trans_ail_delete() drops the AIL lock. */
145 xfs_trans_ail_delete(ailp, (xfs_log_item_t *)efip);
146 xfs_efi_item_free(efip);
148 efip->efi_flags |= XFS_EFI_COMMITTED;
149 spin_unlock(&ailp->xa_lock);
154 * Efi items have no locking or pushing. However, since EFIs are
155 * pulled from the AIL when their corresponding EFDs are committed
156 * to disk, their situation is very similar to being pinned. Return
157 * XFS_ITEM_PINNED so that the caller will eventually flush the log.
158 * This should help in getting the EFI out of the AIL.
162 xfs_efi_item_trylock(xfs_efi_log_item_t *efip)
164 return XFS_ITEM_PINNED;
168 * Efi items have no locking, so just return.
172 xfs_efi_item_unlock(xfs_efi_log_item_t *efip)
174 if (efip->efi_item.li_flags & XFS_LI_ABORTED)
175 xfs_efi_item_free(efip);
180 * The EFI is logged only once and cannot be moved in the log, so
181 * simply return the lsn at which it's been logged. The canceled
182 * flag is not paid any attention here. Checking for that is delayed
183 * until the EFI is unpinned.
187 xfs_efi_item_committed(xfs_efi_log_item_t *efip, xfs_lsn_t lsn)
193 * There isn't much you can do to push on an efi item. It is simply
194 * stuck waiting for all of its corresponding efd items to be
199 xfs_efi_item_push(xfs_efi_log_item_t *efip)
205 * The EFI dependency tracking op doesn't do squat. It can't because
206 * it doesn't know where the free extent is coming from. The dependency
207 * tracking has to be handled by the "enclosing" metadata object. For
208 * example, for inodes, the inode is locked throughout the extent freeing
209 * so the dependency should be recorded there.
213 xfs_efi_item_committing(xfs_efi_log_item_t *efip, xfs_lsn_t lsn)
219 * This is the ops vector shared by all efi log items.
221 static struct xfs_item_ops xfs_efi_item_ops = {
222 .iop_size = (uint(*)(xfs_log_item_t*))xfs_efi_item_size,
223 .iop_format = (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
225 .iop_pin = (void(*)(xfs_log_item_t*))xfs_efi_item_pin,
226 .iop_unpin = (void(*)(xfs_log_item_t*))xfs_efi_item_unpin,
227 .iop_unpin_remove = (void(*)(xfs_log_item_t*, xfs_trans_t *))
228 xfs_efi_item_unpin_remove,
229 .iop_trylock = (uint(*)(xfs_log_item_t*))xfs_efi_item_trylock,
230 .iop_unlock = (void(*)(xfs_log_item_t*))xfs_efi_item_unlock,
231 .iop_committed = (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
232 xfs_efi_item_committed,
233 .iop_push = (void(*)(xfs_log_item_t*))xfs_efi_item_push,
235 .iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
236 xfs_efi_item_committing
241 * Allocate and initialize an efi item with the given number of extents.
244 xfs_efi_init(xfs_mount_t *mp,
248 xfs_efi_log_item_t *efip;
251 ASSERT(nextents > 0);
252 if (nextents > XFS_EFI_MAX_FAST_EXTENTS) {
253 size = (uint)(sizeof(xfs_efi_log_item_t) +
254 ((nextents - 1) * sizeof(xfs_extent_t)));
255 efip = (xfs_efi_log_item_t*)kmem_zalloc(size, KM_SLEEP);
257 efip = (xfs_efi_log_item_t*)kmem_zone_zalloc(xfs_efi_zone,
261 xfs_log_item_init(mp, &efip->efi_item, XFS_LI_EFI, &xfs_efi_item_ops);
262 efip->efi_format.efi_nextents = nextents;
263 efip->efi_format.efi_id = (__psint_t)(void*)efip;
269 * Copy an EFI format buffer from the given buf, and into the destination
270 * EFI format structure.
271 * The given buffer can be in 32 bit or 64 bit form (which has different padding),
272 * one of which will be the native format for this kernel.
273 * It will handle the conversion of formats if necessary.
276 xfs_efi_copy_format(xfs_log_iovec_t *buf, xfs_efi_log_format_t *dst_efi_fmt)
278 xfs_efi_log_format_t *src_efi_fmt = (xfs_efi_log_format_t *)buf->i_addr;
280 uint len = sizeof(xfs_efi_log_format_t) +
281 (src_efi_fmt->efi_nextents - 1) * sizeof(xfs_extent_t);
282 uint len32 = sizeof(xfs_efi_log_format_32_t) +
283 (src_efi_fmt->efi_nextents - 1) * sizeof(xfs_extent_32_t);
284 uint len64 = sizeof(xfs_efi_log_format_64_t) +
285 (src_efi_fmt->efi_nextents - 1) * sizeof(xfs_extent_64_t);
287 if (buf->i_len == len) {
288 memcpy((char *)dst_efi_fmt, (char*)src_efi_fmt, len);
290 } else if (buf->i_len == len32) {
291 xfs_efi_log_format_32_t *src_efi_fmt_32 =
292 (xfs_efi_log_format_32_t *)buf->i_addr;
294 dst_efi_fmt->efi_type = src_efi_fmt_32->efi_type;
295 dst_efi_fmt->efi_size = src_efi_fmt_32->efi_size;
296 dst_efi_fmt->efi_nextents = src_efi_fmt_32->efi_nextents;
297 dst_efi_fmt->efi_id = src_efi_fmt_32->efi_id;
298 for (i = 0; i < dst_efi_fmt->efi_nextents; i++) {
299 dst_efi_fmt->efi_extents[i].ext_start =
300 src_efi_fmt_32->efi_extents[i].ext_start;
301 dst_efi_fmt->efi_extents[i].ext_len =
302 src_efi_fmt_32->efi_extents[i].ext_len;
305 } else if (buf->i_len == len64) {
306 xfs_efi_log_format_64_t *src_efi_fmt_64 =
307 (xfs_efi_log_format_64_t *)buf->i_addr;
309 dst_efi_fmt->efi_type = src_efi_fmt_64->efi_type;
310 dst_efi_fmt->efi_size = src_efi_fmt_64->efi_size;
311 dst_efi_fmt->efi_nextents = src_efi_fmt_64->efi_nextents;
312 dst_efi_fmt->efi_id = src_efi_fmt_64->efi_id;
313 for (i = 0; i < dst_efi_fmt->efi_nextents; i++) {
314 dst_efi_fmt->efi_extents[i].ext_start =
315 src_efi_fmt_64->efi_extents[i].ext_start;
316 dst_efi_fmt->efi_extents[i].ext_len =
317 src_efi_fmt_64->efi_extents[i].ext_len;
325 * This is called by the efd item code below to release references to
326 * the given efi item. Each efd calls this with the number of
327 * extents that it has logged, and when the sum of these reaches
328 * the total number of extents logged by this efi item we can free
331 * Freeing the efi item requires that we remove it from the AIL.
332 * We'll use the AIL lock to protect our counters as well as
333 * the removal from the AIL.
336 xfs_efi_release(xfs_efi_log_item_t *efip,
339 struct xfs_ail *ailp = efip->efi_item.li_ailp;
342 ASSERT(efip->efi_next_extent > 0);
343 ASSERT(efip->efi_flags & XFS_EFI_COMMITTED);
345 spin_lock(&ailp->xa_lock);
346 ASSERT(efip->efi_next_extent >= nextents);
347 efip->efi_next_extent -= nextents;
348 extents_left = efip->efi_next_extent;
349 if (extents_left == 0) {
350 /* xfs_trans_ail_delete() drops the AIL lock. */
351 xfs_trans_ail_delete(ailp, (xfs_log_item_t *)efip);
352 xfs_efi_item_free(efip);
354 spin_unlock(&ailp->xa_lock);
359 xfs_efd_item_free(xfs_efd_log_item_t *efdp)
361 int nexts = efdp->efd_format.efd_nextents;
363 if (nexts > XFS_EFD_MAX_FAST_EXTENTS) {
366 kmem_zone_free(xfs_efd_zone, efdp);
371 * This returns the number of iovecs needed to log the given efd item.
372 * We only need 1 iovec for an efd item. It just logs the efd_log_format
377 xfs_efd_item_size(xfs_efd_log_item_t *efdp)
383 * This is called to fill in the vector of log iovecs for the
384 * given efd log item. We use only 1 iovec, and we point that
385 * at the efd_log_format structure embedded in the efd item.
386 * It is at this point that we assert that all of the extent
387 * slots in the efd item have been filled.
390 xfs_efd_item_format(xfs_efd_log_item_t *efdp,
391 xfs_log_iovec_t *log_vector)
395 ASSERT(efdp->efd_next_extent == efdp->efd_format.efd_nextents);
397 efdp->efd_format.efd_type = XFS_LI_EFD;
399 size = sizeof(xfs_efd_log_format_t);
400 size += (efdp->efd_format.efd_nextents - 1) * sizeof(xfs_extent_t);
401 efdp->efd_format.efd_size = 1;
403 log_vector->i_addr = (xfs_caddr_t)&(efdp->efd_format);
404 log_vector->i_len = size;
405 log_vector->i_type = XLOG_REG_TYPE_EFD_FORMAT;
406 ASSERT(size >= sizeof(xfs_efd_log_format_t));
411 * Pinning has no meaning for an efd item, so just return.
415 xfs_efd_item_pin(xfs_efd_log_item_t *efdp)
422 * Since pinning has no meaning for an efd item, unpinning does
427 xfs_efd_item_unpin(xfs_efd_log_item_t *efdp)
434 xfs_efd_item_unpin_remove(xfs_efd_log_item_t *efdp, xfs_trans_t *tp)
440 * Efd items have no locking, so just return success.
444 xfs_efd_item_trylock(xfs_efd_log_item_t *efdp)
446 return XFS_ITEM_LOCKED;
450 * Efd items have no locking or pushing, so return failure
451 * so that the caller doesn't bother with us.
455 xfs_efd_item_unlock(xfs_efd_log_item_t *efdp)
457 if (efdp->efd_item.li_flags & XFS_LI_ABORTED)
458 xfs_efd_item_free(efdp);
463 * When the efd item is committed to disk, all we need to do
464 * is delete our reference to our partner efi item and then
465 * free ourselves. Since we're freeing ourselves we must
466 * return -1 to keep the transaction code from further referencing
471 xfs_efd_item_committed(xfs_efd_log_item_t *efdp, xfs_lsn_t lsn)
474 * If we got a log I/O error, it's always the case that the LR with the
475 * EFI got unpinned and freed before the EFD got aborted.
477 if ((efdp->efd_item.li_flags & XFS_LI_ABORTED) == 0)
478 xfs_efi_release(efdp->efd_efip, efdp->efd_format.efd_nextents);
480 xfs_efd_item_free(efdp);
481 return (xfs_lsn_t)-1;
485 * There isn't much you can do to push on an efd item. It is simply
486 * stuck waiting for the log to be flushed to disk.
490 xfs_efd_item_push(xfs_efd_log_item_t *efdp)
496 * The EFD dependency tracking op doesn't do squat. It can't because
497 * it doesn't know where the free extent is coming from. The dependency
498 * tracking has to be handled by the "enclosing" metadata object. For
499 * example, for inodes, the inode is locked throughout the extent freeing
500 * so the dependency should be recorded there.
504 xfs_efd_item_committing(xfs_efd_log_item_t *efip, xfs_lsn_t lsn)
510 * This is the ops vector shared by all efd log items.
512 static struct xfs_item_ops xfs_efd_item_ops = {
513 .iop_size = (uint(*)(xfs_log_item_t*))xfs_efd_item_size,
514 .iop_format = (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
516 .iop_pin = (void(*)(xfs_log_item_t*))xfs_efd_item_pin,
517 .iop_unpin = (void(*)(xfs_log_item_t*))xfs_efd_item_unpin,
518 .iop_unpin_remove = (void(*)(xfs_log_item_t*, xfs_trans_t*))
519 xfs_efd_item_unpin_remove,
520 .iop_trylock = (uint(*)(xfs_log_item_t*))xfs_efd_item_trylock,
521 .iop_unlock = (void(*)(xfs_log_item_t*))xfs_efd_item_unlock,
522 .iop_committed = (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
523 xfs_efd_item_committed,
524 .iop_push = (void(*)(xfs_log_item_t*))xfs_efd_item_push,
526 .iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
527 xfs_efd_item_committing
532 * Allocate and initialize an efd item with the given number of extents.
535 xfs_efd_init(xfs_mount_t *mp,
536 xfs_efi_log_item_t *efip,
540 xfs_efd_log_item_t *efdp;
543 ASSERT(nextents > 0);
544 if (nextents > XFS_EFD_MAX_FAST_EXTENTS) {
545 size = (uint)(sizeof(xfs_efd_log_item_t) +
546 ((nextents - 1) * sizeof(xfs_extent_t)));
547 efdp = (xfs_efd_log_item_t*)kmem_zalloc(size, KM_SLEEP);
549 efdp = (xfs_efd_log_item_t*)kmem_zone_zalloc(xfs_efd_zone,
553 xfs_log_item_init(mp, &efdp->efd_item, XFS_LI_EFD, &xfs_efd_item_ops);
554 efdp->efd_efip = efip;
555 efdp->efd_format.efd_nextents = nextents;
556 efdp->efd_format.efd_efi_id = efip->efi_format.efi_id;