| /* |
| * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc. |
| * All Rights Reserved. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it would be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| #include "xfs.h" |
| #include "xfs_fs.h" |
| #include "xfs_types.h" |
| #include "xfs_log.h" |
| #include "xfs_inum.h" |
| #include "xfs_trans.h" |
| #include "xfs_buf_item.h" |
| #include "xfs_sb.h" |
| #include "xfs_ag.h" |
| #include "xfs_mount.h" |
| #include "xfs_trans_priv.h" |
| #include "xfs_extfree_item.h" |
| |
| |
| kmem_zone_t *xfs_efi_zone; |
| kmem_zone_t *xfs_efd_zone; |
| |
| static inline struct xfs_efi_log_item *EFI_ITEM(struct xfs_log_item *lip) |
| { |
| return container_of(lip, struct xfs_efi_log_item, efi_item); |
| } |
| |
| void |
| xfs_efi_item_free( |
| struct xfs_efi_log_item *efip) |
| { |
| if (efip->efi_format.efi_nextents > XFS_EFI_MAX_FAST_EXTENTS) |
| kmem_free(efip); |
| else |
| kmem_zone_free(xfs_efi_zone, efip); |
| } |
| |
| /* |
| * Freeing the efi requires that we remove it from the AIL if it has already |
| * been placed there. However, the EFI may not yet have been placed in the AIL |
| * when called by xfs_efi_release() from EFD processing due to the ordering of |
| * committed vs unpin operations in bulk insert operations. Hence the |
| * test_and_clear_bit(XFS_EFI_COMMITTED) to ensure only the last caller frees |
| * the EFI. |
| */ |
| STATIC void |
| __xfs_efi_release( |
| struct xfs_efi_log_item *efip) |
| { |
| struct xfs_ail *ailp = efip->efi_item.li_ailp; |
| |
| if (!test_and_clear_bit(XFS_EFI_COMMITTED, &efip->efi_flags)) { |
| spin_lock(&ailp->xa_lock); |
| /* xfs_trans_ail_delete() drops the AIL lock. */ |
| xfs_trans_ail_delete(ailp, &efip->efi_item, |
| SHUTDOWN_LOG_IO_ERROR); |
| xfs_efi_item_free(efip); |
| } |
| } |
| |
| /* |
| * This returns the number of iovecs needed to log the given efi item. |
| * We only need 1 iovec for an efi item. It just logs the efi_log_format |
| * structure. |
| */ |
| STATIC uint |
| xfs_efi_item_size( |
| struct xfs_log_item *lip) |
| { |
| return 1; |
| } |
| |
| /* |
| * This is called to fill in the vector of log iovecs for the |
| * given efi log item. We use only 1 iovec, and we point that |
| * at the efi_log_format structure embedded in the efi item. |
| * It is at this point that we assert that all of the extent |
| * slots in the efi item have been filled. |
| */ |
| STATIC void |
| xfs_efi_item_format( |
| struct xfs_log_item *lip, |
| struct xfs_log_iovec *log_vector) |
| { |
| struct xfs_efi_log_item *efip = EFI_ITEM(lip); |
| uint size; |
| |
| ASSERT(atomic_read(&efip->efi_next_extent) == |
| efip->efi_format.efi_nextents); |
| |
| efip->efi_format.efi_type = XFS_LI_EFI; |
| |
| size = sizeof(xfs_efi_log_format_t); |
| size += (efip->efi_format.efi_nextents - 1) * sizeof(xfs_extent_t); |
| efip->efi_format.efi_size = 1; |
| |
| log_vector->i_addr = &efip->efi_format; |
| log_vector->i_len = size; |
| log_vector->i_type = XLOG_REG_TYPE_EFI_FORMAT; |
| ASSERT(size >= sizeof(xfs_efi_log_format_t)); |
| } |
| |
| |
| /* |
| * Pinning has no meaning for an efi item, so just return. |
| */ |
| STATIC void |
| xfs_efi_item_pin( |
| struct xfs_log_item *lip) |
| { |
| } |
| |
| /* |
| * While EFIs cannot really be pinned, the unpin operation is the last place at |
| * which the EFI is manipulated during a transaction. If we are being asked to |
| * remove the EFI it's because the transaction has been cancelled and by |
| * definition that means the EFI cannot be in the AIL so remove it from the |
| * transaction and free it. Otherwise coordinate with xfs_efi_release() (via |
| * XFS_EFI_COMMITTED) to determine who gets to free the EFI. |
| */ |
| STATIC void |
| xfs_efi_item_unpin( |
| struct xfs_log_item *lip, |
| int remove) |
| { |
| struct xfs_efi_log_item *efip = EFI_ITEM(lip); |
| |
| if (remove) { |
| ASSERT(!(lip->li_flags & XFS_LI_IN_AIL)); |
| if (lip->li_desc) |
| xfs_trans_del_item(lip); |
| xfs_efi_item_free(efip); |
| return; |
| } |
| __xfs_efi_release(efip); |
| } |
| |
| /* |
| * Efi items have no locking or pushing. However, since EFIs are pulled from |
| * the AIL when their corresponding EFDs are committed to disk, their situation |
| * is very similar to being pinned. Return XFS_ITEM_PINNED so that the caller |
| * will eventually flush the log. This should help in getting the EFI out of |
| * the AIL. |
| */ |
| STATIC uint |
| xfs_efi_item_push( |
| struct xfs_log_item *lip, |
| struct list_head *buffer_list) |
| { |
| return XFS_ITEM_PINNED; |
| } |
| |
| STATIC void |
| xfs_efi_item_unlock( |
| struct xfs_log_item *lip) |
| { |
| if (lip->li_flags & XFS_LI_ABORTED) |
| xfs_efi_item_free(EFI_ITEM(lip)); |
| } |
| |
| /* |
| * The EFI is logged only once and cannot be moved in the log, so simply return |
| * the lsn at which it's been logged. For bulk transaction committed |
| * processing, the EFI may be processed but not yet unpinned prior to the EFD |
| * being processed. Set the XFS_EFI_COMMITTED flag so this case can be detected |
| * when processing the EFD. |
| */ |
| STATIC xfs_lsn_t |
| xfs_efi_item_committed( |
| struct xfs_log_item *lip, |
| xfs_lsn_t lsn) |
| { |
| struct xfs_efi_log_item *efip = EFI_ITEM(lip); |
| |
| set_bit(XFS_EFI_COMMITTED, &efip->efi_flags); |
| return lsn; |
| } |
| |
| /* |
| * The EFI dependency tracking op doesn't do squat. It can't because |
| * it doesn't know where the free extent is coming from. The dependency |
| * tracking has to be handled by the "enclosing" metadata object. For |
| * example, for inodes, the inode is locked throughout the extent freeing |
| * so the dependency should be recorded there. |
| */ |
| STATIC void |
| xfs_efi_item_committing( |
| struct xfs_log_item *lip, |
| xfs_lsn_t lsn) |
| { |
| } |
| |
| /* |
| * This is the ops vector shared by all efi log items. |
| */ |
| static const struct xfs_item_ops xfs_efi_item_ops = { |
| .iop_size = xfs_efi_item_size, |
| .iop_format = xfs_efi_item_format, |
| .iop_pin = xfs_efi_item_pin, |
| .iop_unpin = xfs_efi_item_unpin, |
| .iop_unlock = xfs_efi_item_unlock, |
| .iop_committed = xfs_efi_item_committed, |
| .iop_push = xfs_efi_item_push, |
| .iop_committing = xfs_efi_item_committing |
| }; |
| |
| |
| /* |
| * Allocate and initialize an efi item with the given number of extents. |
| */ |
| struct xfs_efi_log_item * |
| xfs_efi_init( |
| struct xfs_mount *mp, |
| uint nextents) |
| |
| { |
| struct xfs_efi_log_item *efip; |
| uint size; |
| |
| ASSERT(nextents > 0); |
| if (nextents > XFS_EFI_MAX_FAST_EXTENTS) { |
| size = (uint)(sizeof(xfs_efi_log_item_t) + |
| ((nextents - 1) * sizeof(xfs_extent_t))); |
| efip = kmem_zalloc(size, KM_SLEEP); |
| } else { |
| efip = kmem_zone_zalloc(xfs_efi_zone, KM_SLEEP); |
| } |
| |
| xfs_log_item_init(mp, &efip->efi_item, XFS_LI_EFI, &xfs_efi_item_ops); |
| efip->efi_format.efi_nextents = nextents; |
| efip->efi_format.efi_id = (__psint_t)(void*)efip; |
| atomic_set(&efip->efi_next_extent, 0); |
| |
| return efip; |
| } |
| |
| /* |
| * Copy an EFI format buffer from the given buf, and into the destination |
| * EFI format structure. |
| * The given buffer can be in 32 bit or 64 bit form (which has different padding), |
| * one of which will be the native format for this kernel. |
| * It will handle the conversion of formats if necessary. |
| */ |
| int |
| xfs_efi_copy_format(xfs_log_iovec_t *buf, xfs_efi_log_format_t *dst_efi_fmt) |
| { |
| xfs_efi_log_format_t *src_efi_fmt = buf->i_addr; |
| uint i; |
| uint len = sizeof(xfs_efi_log_format_t) + |
| (src_efi_fmt->efi_nextents - 1) * sizeof(xfs_extent_t); |
| uint len32 = sizeof(xfs_efi_log_format_32_t) + |
| (src_efi_fmt->efi_nextents - 1) * sizeof(xfs_extent_32_t); |
| uint len64 = sizeof(xfs_efi_log_format_64_t) + |
| (src_efi_fmt->efi_nextents - 1) * sizeof(xfs_extent_64_t); |
| |
| if (buf->i_len == len) { |
| memcpy((char *)dst_efi_fmt, (char*)src_efi_fmt, len); |
| return 0; |
| } else if (buf->i_len == len32) { |
| xfs_efi_log_format_32_t *src_efi_fmt_32 = buf->i_addr; |
| |
| dst_efi_fmt->efi_type = src_efi_fmt_32->efi_type; |
| dst_efi_fmt->efi_size = src_efi_fmt_32->efi_size; |
| dst_efi_fmt->efi_nextents = src_efi_fmt_32->efi_nextents; |
| dst_efi_fmt->efi_id = src_efi_fmt_32->efi_id; |
| for (i = 0; i < dst_efi_fmt->efi_nextents; i++) { |
| dst_efi_fmt->efi_extents[i].ext_start = |
| src_efi_fmt_32->efi_extents[i].ext_start; |
| dst_efi_fmt->efi_extents[i].ext_len = |
| src_efi_fmt_32->efi_extents[i].ext_len; |
| } |
| return 0; |
| } else if (buf->i_len == len64) { |
| xfs_efi_log_format_64_t *src_efi_fmt_64 = buf->i_addr; |
| |
| dst_efi_fmt->efi_type = src_efi_fmt_64->efi_type; |
| dst_efi_fmt->efi_size = src_efi_fmt_64->efi_size; |
| dst_efi_fmt->efi_nextents = src_efi_fmt_64->efi_nextents; |
| dst_efi_fmt->efi_id = src_efi_fmt_64->efi_id; |
| for (i = 0; i < dst_efi_fmt->efi_nextents; i++) { |
| dst_efi_fmt->efi_extents[i].ext_start = |
| src_efi_fmt_64->efi_extents[i].ext_start; |
| dst_efi_fmt->efi_extents[i].ext_len = |
| src_efi_fmt_64->efi_extents[i].ext_len; |
| } |
| return 0; |
| } |
| return EFSCORRUPTED; |
| } |
| |
| /* |
| * This is called by the efd item code below to release references to the given |
| * efi item. Each efd calls this with the number of extents that it has |
| * logged, and when the sum of these reaches the total number of extents logged |
| * by this efi item we can free the efi item. |
| */ |
| void |
| xfs_efi_release(xfs_efi_log_item_t *efip, |
| uint nextents) |
| { |
| ASSERT(atomic_read(&efip->efi_next_extent) >= nextents); |
| if (atomic_sub_and_test(nextents, &efip->efi_next_extent)) |
| __xfs_efi_release(efip); |
| } |
| |
| static inline struct xfs_efd_log_item *EFD_ITEM(struct xfs_log_item *lip) |
| { |
| return container_of(lip, struct xfs_efd_log_item, efd_item); |
| } |
| |
| STATIC void |
| xfs_efd_item_free(struct xfs_efd_log_item *efdp) |
| { |
| if (efdp->efd_format.efd_nextents > XFS_EFD_MAX_FAST_EXTENTS) |
| kmem_free(efdp); |
| else |
| kmem_zone_free(xfs_efd_zone, efdp); |
| } |
| |
| /* |
| * This returns the number of iovecs needed to log the given efd item. |
| * We only need 1 iovec for an efd item. It just logs the efd_log_format |
| * structure. |
| */ |
| STATIC uint |
| xfs_efd_item_size( |
| struct xfs_log_item *lip) |
| { |
| return 1; |
| } |
| |
| /* |
| * This is called to fill in the vector of log iovecs for the |
| * given efd log item. We use only 1 iovec, and we point that |
| * at the efd_log_format structure embedded in the efd item. |
| * It is at this point that we assert that all of the extent |
| * slots in the efd item have been filled. |
| */ |
| STATIC void |
| xfs_efd_item_format( |
| struct xfs_log_item *lip, |
| struct xfs_log_iovec *log_vector) |
| { |
| struct xfs_efd_log_item *efdp = EFD_ITEM(lip); |
| uint size; |
| |
| ASSERT(efdp->efd_next_extent == efdp->efd_format.efd_nextents); |
| |
| efdp->efd_format.efd_type = XFS_LI_EFD; |
| |
| size = sizeof(xfs_efd_log_format_t); |
| size += (efdp->efd_format.efd_nextents - 1) * sizeof(xfs_extent_t); |
| efdp->efd_format.efd_size = 1; |
| |
| log_vector->i_addr = &efdp->efd_format; |
| log_vector->i_len = size; |
| log_vector->i_type = XLOG_REG_TYPE_EFD_FORMAT; |
| ASSERT(size >= sizeof(xfs_efd_log_format_t)); |
| } |
| |
| /* |
| * Pinning has no meaning for an efd item, so just return. |
| */ |
| STATIC void |
| xfs_efd_item_pin( |
| struct xfs_log_item *lip) |
| { |
| } |
| |
| /* |
| * Since pinning has no meaning for an efd item, unpinning does |
| * not either. |
| */ |
| STATIC void |
| xfs_efd_item_unpin( |
| struct xfs_log_item *lip, |
| int remove) |
| { |
| } |
| |
| /* |
| * There isn't much you can do to push on an efd item. It is simply stuck |
| * waiting for the log to be flushed to disk. |
| */ |
| STATIC uint |
| xfs_efd_item_push( |
| struct xfs_log_item *lip, |
| struct list_head *buffer_list) |
| { |
| return XFS_ITEM_PINNED; |
| } |
| |
| STATIC void |
| xfs_efd_item_unlock( |
| struct xfs_log_item *lip) |
| { |
| if (lip->li_flags & XFS_LI_ABORTED) |
| xfs_efd_item_free(EFD_ITEM(lip)); |
| } |
| |
| /* |
| * When the efd item is committed to disk, all we need to do |
| * is delete our reference to our partner efi item and then |
| * free ourselves. Since we're freeing ourselves we must |
| * return -1 to keep the transaction code from further referencing |
| * this item. |
| */ |
| STATIC xfs_lsn_t |
| xfs_efd_item_committed( |
| struct xfs_log_item *lip, |
| xfs_lsn_t lsn) |
| { |
| struct xfs_efd_log_item *efdp = EFD_ITEM(lip); |
| |
| /* |
| * If we got a log I/O error, it's always the case that the LR with the |
| * EFI got unpinned and freed before the EFD got aborted. |
| */ |
| if (!(lip->li_flags & XFS_LI_ABORTED)) |
| xfs_efi_release(efdp->efd_efip, efdp->efd_format.efd_nextents); |
| |
| xfs_efd_item_free(efdp); |
| return (xfs_lsn_t)-1; |
| } |
| |
| /* |
| * The EFD dependency tracking op doesn't do squat. It can't because |
| * it doesn't know where the free extent is coming from. The dependency |
| * tracking has to be handled by the "enclosing" metadata object. For |
| * example, for inodes, the inode is locked throughout the extent freeing |
| * so the dependency should be recorded there. |
| */ |
| STATIC void |
| xfs_efd_item_committing( |
| struct xfs_log_item *lip, |
| xfs_lsn_t lsn) |
| { |
| } |
| |
| /* |
| * This is the ops vector shared by all efd log items. |
| */ |
| static const struct xfs_item_ops xfs_efd_item_ops = { |
| .iop_size = xfs_efd_item_size, |
| .iop_format = xfs_efd_item_format, |
| .iop_pin = xfs_efd_item_pin, |
| .iop_unpin = xfs_efd_item_unpin, |
| .iop_unlock = xfs_efd_item_unlock, |
| .iop_committed = xfs_efd_item_committed, |
| .iop_push = xfs_efd_item_push, |
| .iop_committing = xfs_efd_item_committing |
| }; |
| |
| /* |
| * Allocate and initialize an efd item with the given number of extents. |
| */ |
| struct xfs_efd_log_item * |
| xfs_efd_init( |
| struct xfs_mount *mp, |
| struct xfs_efi_log_item *efip, |
| uint nextents) |
| |
| { |
| struct xfs_efd_log_item *efdp; |
| uint size; |
| |
| ASSERT(nextents > 0); |
| if (nextents > XFS_EFD_MAX_FAST_EXTENTS) { |
| size = (uint)(sizeof(xfs_efd_log_item_t) + |
| ((nextents - 1) * sizeof(xfs_extent_t))); |
| efdp = kmem_zalloc(size, KM_SLEEP); |
| } else { |
| efdp = kmem_zone_zalloc(xfs_efd_zone, KM_SLEEP); |
| } |
| |
| xfs_log_item_init(mp, &efdp->efd_item, XFS_LI_EFD, &xfs_efd_item_ops); |
| efdp->efd_efip = efip; |
| efdp->efd_format.efd_nextents = nextents; |
| efdp->efd_format.efd_efi_id = efip->efi_format.efi_id; |
| |
| return efdp; |
| } |