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 inline struct xfs_efi_log_item
*EFI_ITEM(struct xfs_log_item
*lip
)
37 return container_of(lip
, struct xfs_efi_log_item
, efi_item
);
42 struct xfs_efi_log_item
*efip
)
44 if (efip
->efi_format
.efi_nextents
> XFS_EFI_MAX_FAST_EXTENTS
)
47 kmem_zone_free(xfs_efi_zone
, efip
);
51 * Freeing the efi requires that we remove it from the AIL if it has already
52 * been placed there. However, the EFI may not yet have been placed in the AIL
53 * when called by xfs_efi_release() from EFD processing due to the ordering of
54 * committed vs unpin operations in bulk insert operations. Hence the
55 * test_and_clear_bit(XFS_EFI_COMMITTED) to ensure only the last caller frees
60 struct xfs_efi_log_item
*efip
)
62 struct xfs_ail
*ailp
= efip
->efi_item
.li_ailp
;
64 if (!test_and_clear_bit(XFS_EFI_COMMITTED
, &efip
->efi_flags
)) {
65 spin_lock(&ailp
->xa_lock
);
66 /* xfs_trans_ail_delete() drops the AIL lock. */
67 xfs_trans_ail_delete(ailp
, &efip
->efi_item
,
68 SHUTDOWN_LOG_IO_ERROR
);
69 xfs_efi_item_free(efip
);
74 * This returns the number of iovecs needed to log the given efi item.
75 * We only need 1 iovec for an efi item. It just logs the efi_log_format
80 struct xfs_log_item
*lip
)
86 * This is called to fill in the vector of log iovecs for the
87 * given efi log item. We use only 1 iovec, and we point that
88 * at the efi_log_format structure embedded in the efi item.
89 * It is at this point that we assert that all of the extent
90 * slots in the efi item have been filled.
94 struct xfs_log_item
*lip
,
95 struct xfs_log_iovec
*log_vector
)
97 struct xfs_efi_log_item
*efip
= EFI_ITEM(lip
);
100 ASSERT(atomic_read(&efip
->efi_next_extent
) ==
101 efip
->efi_format
.efi_nextents
);
103 efip
->efi_format
.efi_type
= XFS_LI_EFI
;
105 size
= sizeof(xfs_efi_log_format_t
);
106 size
+= (efip
->efi_format
.efi_nextents
- 1) * sizeof(xfs_extent_t
);
107 efip
->efi_format
.efi_size
= 1;
109 log_vector
->i_addr
= &efip
->efi_format
;
110 log_vector
->i_len
= size
;
111 log_vector
->i_type
= XLOG_REG_TYPE_EFI_FORMAT
;
112 ASSERT(size
>= sizeof(xfs_efi_log_format_t
));
117 * Pinning has no meaning for an efi item, so just return.
121 struct xfs_log_item
*lip
)
126 * While EFIs cannot really be pinned, the unpin operation is the last place at
127 * which the EFI is manipulated during a transaction. If we are being asked to
128 * remove the EFI it's because the transaction has been cancelled and by
129 * definition that means the EFI cannot be in the AIL so remove it from the
130 * transaction and free it. Otherwise coordinate with xfs_efi_release() (via
131 * XFS_EFI_COMMITTED) to determine who gets to free the EFI.
135 struct xfs_log_item
*lip
,
138 struct xfs_efi_log_item
*efip
= EFI_ITEM(lip
);
141 ASSERT(!(lip
->li_flags
& XFS_LI_IN_AIL
));
143 xfs_trans_del_item(lip
);
144 xfs_efi_item_free(efip
);
147 __xfs_efi_release(efip
);
151 * Efi items have no locking or pushing. However, since EFIs are pulled from
152 * the AIL when their corresponding EFDs are committed to disk, their situation
153 * is very similar to being pinned. Return XFS_ITEM_PINNED so that the caller
154 * will eventually flush the log. This should help in getting the EFI out of
159 struct xfs_log_item
*lip
,
160 struct list_head
*buffer_list
)
162 return XFS_ITEM_PINNED
;
167 struct xfs_log_item
*lip
)
169 if (lip
->li_flags
& XFS_LI_ABORTED
)
170 xfs_efi_item_free(EFI_ITEM(lip
));
174 * The EFI is logged only once and cannot be moved in the log, so simply return
175 * the lsn at which it's been logged. For bulk transaction committed
176 * processing, the EFI may be processed but not yet unpinned prior to the EFD
177 * being processed. Set the XFS_EFI_COMMITTED flag so this case can be detected
178 * when processing the EFD.
181 xfs_efi_item_committed(
182 struct xfs_log_item
*lip
,
185 struct xfs_efi_log_item
*efip
= EFI_ITEM(lip
);
187 set_bit(XFS_EFI_COMMITTED
, &efip
->efi_flags
);
192 * The EFI dependency tracking op doesn't do squat. It can't because
193 * it doesn't know where the free extent is coming from. The dependency
194 * tracking has to be handled by the "enclosing" metadata object. For
195 * example, for inodes, the inode is locked throughout the extent freeing
196 * so the dependency should be recorded there.
199 xfs_efi_item_committing(
200 struct xfs_log_item
*lip
,
206 * This is the ops vector shared by all efi log items.
208 static const struct xfs_item_ops xfs_efi_item_ops
= {
209 .iop_size
= xfs_efi_item_size
,
210 .iop_format
= xfs_efi_item_format
,
211 .iop_pin
= xfs_efi_item_pin
,
212 .iop_unpin
= xfs_efi_item_unpin
,
213 .iop_unlock
= xfs_efi_item_unlock
,
214 .iop_committed
= xfs_efi_item_committed
,
215 .iop_push
= xfs_efi_item_push
,
216 .iop_committing
= xfs_efi_item_committing
221 * Allocate and initialize an efi item with the given number of extents.
223 struct xfs_efi_log_item
*
225 struct xfs_mount
*mp
,
229 struct xfs_efi_log_item
*efip
;
232 ASSERT(nextents
> 0);
233 if (nextents
> XFS_EFI_MAX_FAST_EXTENTS
) {
234 size
= (uint
)(sizeof(xfs_efi_log_item_t
) +
235 ((nextents
- 1) * sizeof(xfs_extent_t
)));
236 efip
= kmem_zalloc(size
, KM_SLEEP
);
238 efip
= kmem_zone_zalloc(xfs_efi_zone
, KM_SLEEP
);
241 xfs_log_item_init(mp
, &efip
->efi_item
, XFS_LI_EFI
, &xfs_efi_item_ops
);
242 efip
->efi_format
.efi_nextents
= nextents
;
243 efip
->efi_format
.efi_id
= (__psint_t
)(void*)efip
;
244 atomic_set(&efip
->efi_next_extent
, 0);
250 * Copy an EFI format buffer from the given buf, and into the destination
251 * EFI format structure.
252 * The given buffer can be in 32 bit or 64 bit form (which has different padding),
253 * one of which will be the native format for this kernel.
254 * It will handle the conversion of formats if necessary.
257 xfs_efi_copy_format(xfs_log_iovec_t
*buf
, xfs_efi_log_format_t
*dst_efi_fmt
)
259 xfs_efi_log_format_t
*src_efi_fmt
= buf
->i_addr
;
261 uint len
= sizeof(xfs_efi_log_format_t
) +
262 (src_efi_fmt
->efi_nextents
- 1) * sizeof(xfs_extent_t
);
263 uint len32
= sizeof(xfs_efi_log_format_32_t
) +
264 (src_efi_fmt
->efi_nextents
- 1) * sizeof(xfs_extent_32_t
);
265 uint len64
= sizeof(xfs_efi_log_format_64_t
) +
266 (src_efi_fmt
->efi_nextents
- 1) * sizeof(xfs_extent_64_t
);
268 if (buf
->i_len
== len
) {
269 memcpy((char *)dst_efi_fmt
, (char*)src_efi_fmt
, len
);
271 } else if (buf
->i_len
== len32
) {
272 xfs_efi_log_format_32_t
*src_efi_fmt_32
= buf
->i_addr
;
274 dst_efi_fmt
->efi_type
= src_efi_fmt_32
->efi_type
;
275 dst_efi_fmt
->efi_size
= src_efi_fmt_32
->efi_size
;
276 dst_efi_fmt
->efi_nextents
= src_efi_fmt_32
->efi_nextents
;
277 dst_efi_fmt
->efi_id
= src_efi_fmt_32
->efi_id
;
278 for (i
= 0; i
< dst_efi_fmt
->efi_nextents
; i
++) {
279 dst_efi_fmt
->efi_extents
[i
].ext_start
=
280 src_efi_fmt_32
->efi_extents
[i
].ext_start
;
281 dst_efi_fmt
->efi_extents
[i
].ext_len
=
282 src_efi_fmt_32
->efi_extents
[i
].ext_len
;
285 } else if (buf
->i_len
== len64
) {
286 xfs_efi_log_format_64_t
*src_efi_fmt_64
= buf
->i_addr
;
288 dst_efi_fmt
->efi_type
= src_efi_fmt_64
->efi_type
;
289 dst_efi_fmt
->efi_size
= src_efi_fmt_64
->efi_size
;
290 dst_efi_fmt
->efi_nextents
= src_efi_fmt_64
->efi_nextents
;
291 dst_efi_fmt
->efi_id
= src_efi_fmt_64
->efi_id
;
292 for (i
= 0; i
< dst_efi_fmt
->efi_nextents
; i
++) {
293 dst_efi_fmt
->efi_extents
[i
].ext_start
=
294 src_efi_fmt_64
->efi_extents
[i
].ext_start
;
295 dst_efi_fmt
->efi_extents
[i
].ext_len
=
296 src_efi_fmt_64
->efi_extents
[i
].ext_len
;
304 * This is called by the efd item code below to release references to the given
305 * efi item. Each efd calls this with the number of extents that it has
306 * logged, and when the sum of these reaches the total number of extents logged
307 * by this efi item we can free the efi item.
310 xfs_efi_release(xfs_efi_log_item_t
*efip
,
313 ASSERT(atomic_read(&efip
->efi_next_extent
) >= nextents
);
314 if (atomic_sub_and_test(nextents
, &efip
->efi_next_extent
))
315 __xfs_efi_release(efip
);
318 static inline struct xfs_efd_log_item
*EFD_ITEM(struct xfs_log_item
*lip
)
320 return container_of(lip
, struct xfs_efd_log_item
, efd_item
);
324 xfs_efd_item_free(struct xfs_efd_log_item
*efdp
)
326 if (efdp
->efd_format
.efd_nextents
> XFS_EFD_MAX_FAST_EXTENTS
)
329 kmem_zone_free(xfs_efd_zone
, efdp
);
333 * This returns the number of iovecs needed to log the given efd item.
334 * We only need 1 iovec for an efd item. It just logs the efd_log_format
339 struct xfs_log_item
*lip
)
345 * This is called to fill in the vector of log iovecs for the
346 * given efd log item. We use only 1 iovec, and we point that
347 * at the efd_log_format structure embedded in the efd item.
348 * It is at this point that we assert that all of the extent
349 * slots in the efd item have been filled.
353 struct xfs_log_item
*lip
,
354 struct xfs_log_iovec
*log_vector
)
356 struct xfs_efd_log_item
*efdp
= EFD_ITEM(lip
);
359 ASSERT(efdp
->efd_next_extent
== efdp
->efd_format
.efd_nextents
);
361 efdp
->efd_format
.efd_type
= XFS_LI_EFD
;
363 size
= sizeof(xfs_efd_log_format_t
);
364 size
+= (efdp
->efd_format
.efd_nextents
- 1) * sizeof(xfs_extent_t
);
365 efdp
->efd_format
.efd_size
= 1;
367 log_vector
->i_addr
= &efdp
->efd_format
;
368 log_vector
->i_len
= size
;
369 log_vector
->i_type
= XLOG_REG_TYPE_EFD_FORMAT
;
370 ASSERT(size
>= sizeof(xfs_efd_log_format_t
));
374 * Pinning has no meaning for an efd item, so just return.
378 struct xfs_log_item
*lip
)
383 * Since pinning has no meaning for an efd item, unpinning does
388 struct xfs_log_item
*lip
,
394 * There isn't much you can do to push on an efd item. It is simply stuck
395 * waiting for the log to be flushed to disk.
399 struct xfs_log_item
*lip
,
400 struct list_head
*buffer_list
)
402 return XFS_ITEM_PINNED
;
407 struct xfs_log_item
*lip
)
409 if (lip
->li_flags
& XFS_LI_ABORTED
)
410 xfs_efd_item_free(EFD_ITEM(lip
));
414 * When the efd item is committed to disk, all we need to do
415 * is delete our reference to our partner efi item and then
416 * free ourselves. Since we're freeing ourselves we must
417 * return -1 to keep the transaction code from further referencing
421 xfs_efd_item_committed(
422 struct xfs_log_item
*lip
,
425 struct xfs_efd_log_item
*efdp
= EFD_ITEM(lip
);
428 * If we got a log I/O error, it's always the case that the LR with the
429 * EFI got unpinned and freed before the EFD got aborted.
431 if (!(lip
->li_flags
& XFS_LI_ABORTED
))
432 xfs_efi_release(efdp
->efd_efip
, efdp
->efd_format
.efd_nextents
);
434 xfs_efd_item_free(efdp
);
435 return (xfs_lsn_t
)-1;
439 * The EFD dependency tracking op doesn't do squat. It can't because
440 * it doesn't know where the free extent is coming from. The dependency
441 * tracking has to be handled by the "enclosing" metadata object. For
442 * example, for inodes, the inode is locked throughout the extent freeing
443 * so the dependency should be recorded there.
446 xfs_efd_item_committing(
447 struct xfs_log_item
*lip
,
453 * This is the ops vector shared by all efd log items.
455 static const struct xfs_item_ops xfs_efd_item_ops
= {
456 .iop_size
= xfs_efd_item_size
,
457 .iop_format
= xfs_efd_item_format
,
458 .iop_pin
= xfs_efd_item_pin
,
459 .iop_unpin
= xfs_efd_item_unpin
,
460 .iop_unlock
= xfs_efd_item_unlock
,
461 .iop_committed
= xfs_efd_item_committed
,
462 .iop_push
= xfs_efd_item_push
,
463 .iop_committing
= xfs_efd_item_committing
467 * Allocate and initialize an efd item with the given number of extents.
469 struct xfs_efd_log_item
*
471 struct xfs_mount
*mp
,
472 struct xfs_efi_log_item
*efip
,
476 struct xfs_efd_log_item
*efdp
;
479 ASSERT(nextents
> 0);
480 if (nextents
> XFS_EFD_MAX_FAST_EXTENTS
) {
481 size
= (uint
)(sizeof(xfs_efd_log_item_t
) +
482 ((nextents
- 1) * sizeof(xfs_extent_t
)));
483 efdp
= kmem_zalloc(size
, KM_SLEEP
);
485 efdp
= kmem_zone_zalloc(xfs_efd_zone
, KM_SLEEP
);
488 xfs_log_item_init(mp
, &efdp
->efd_item
, XFS_LI_EFD
, &xfs_efd_item_ops
);
489 efdp
->efd_efip
= efip
;
490 efdp
->efd_format
.efd_nextents
= nextents
;
491 efdp
->efd_format
.efd_efi_id
= efip
->efi_format
.efi_id
;