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fs/xfs/xfs_extfree_item.c
13.9 KB
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/* |
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* Copyright (c) 2000-2001,2005 Silicon Graphics, Inc. * All Rights Reserved. |
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* |
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* This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as |
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* published by the Free Software Foundation. * |
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* 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. |
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* |
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* 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 |
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*/ |
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#include "xfs.h" |
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#include "xfs_fs.h" |
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#include "xfs_types.h" |
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#include "xfs_log.h" |
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#include "xfs_inum.h" |
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#include "xfs_trans.h" #include "xfs_buf_item.h" #include "xfs_sb.h" |
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#include "xfs_ag.h" |
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#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; |
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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); } |
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|
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void |
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xfs_efi_item_free( struct xfs_efi_log_item *efip) |
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{ |
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if (efip->efi_format.efi_nextents > XFS_EFI_MAX_FAST_EXTENTS) |
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kmem_free(efip); |
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else |
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kmem_zone_free(xfs_efi_zone, efip); |
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} |
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/* |
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* 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); xfs_efi_item_free(efip); } } /* |
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* 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. */ |
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STATIC uint |
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xfs_efi_item_size( struct xfs_log_item *lip) |
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{ 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 |
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xfs_efi_item_format( struct xfs_log_item *lip, struct xfs_log_iovec *log_vector) |
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{ |
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struct xfs_efi_log_item *efip = EFI_ITEM(lip); uint size; |
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ASSERT(atomic_read(&efip->efi_next_extent) == efip->efi_format.efi_nextents); |
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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; |
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log_vector->i_addr = &efip->efi_format; |
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log_vector->i_len = size; |
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log_vector->i_type = XLOG_REG_TYPE_EFI_FORMAT; |
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ASSERT(size >= sizeof(xfs_efi_log_format_t)); } /* * Pinning has no meaning for an efi item, so just return. */ |
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STATIC void |
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xfs_efi_item_pin( struct xfs_log_item *lip) |
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{ |
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} |
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/* |
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* 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 |
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* transaction and free it. Otherwise coordinate with xfs_efi_release() (via * XFS_EFI_COMMITTED) to determine who gets to free the EFI. |
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*/ |
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STATIC void |
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xfs_efi_item_unpin( struct xfs_log_item *lip, int remove) |
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{ |
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struct xfs_efi_log_item *efip = EFI_ITEM(lip); |
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|
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if (remove) { ASSERT(!(lip->li_flags & XFS_LI_IN_AIL)); |
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if (lip->li_desc) xfs_trans_del_item(lip); |
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xfs_efi_item_free(efip); |
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return; |
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} |
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__xfs_efi_release(efip); |
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} /* * 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. */ |
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STATIC uint |
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xfs_efi_item_trylock( struct xfs_log_item *lip) |
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{ return XFS_ITEM_PINNED; } /* * Efi items have no locking, so just return. */ |
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STATIC void |
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xfs_efi_item_unlock( struct xfs_log_item *lip) |
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{ |
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if (lip->li_flags & XFS_LI_ABORTED) xfs_efi_item_free(EFI_ITEM(lip)); |
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} /* |
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* 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. |
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*/ |
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STATIC xfs_lsn_t |
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xfs_efi_item_committed( struct xfs_log_item *lip, xfs_lsn_t lsn) |
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{ |
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struct xfs_efi_log_item *efip = EFI_ITEM(lip); set_bit(XFS_EFI_COMMITTED, &efip->efi_flags); |
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return lsn; } /* |
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* There isn't much you can do to push on an efi item. It is simply * stuck waiting for all of its corresponding efd items to be * committed to disk. */ |
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STATIC void |
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xfs_efi_item_push( struct xfs_log_item *lip) |
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{ |
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} /* * 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. */ |
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STATIC void |
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xfs_efi_item_committing( struct xfs_log_item *lip, xfs_lsn_t lsn) |
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{ |
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} /* * This is the ops vector shared by all efi log items. */ |
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static const struct xfs_item_ops xfs_efi_item_ops = { |
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.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_trylock = xfs_efi_item_trylock, .iop_unlock = xfs_efi_item_unlock, .iop_committed = xfs_efi_item_committed, .iop_push = xfs_efi_item_push, .iop_committing = xfs_efi_item_committing |
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}; /* * Allocate and initialize an efi item with the given number of extents. */ |
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struct xfs_efi_log_item * xfs_efi_init( struct xfs_mount *mp, uint nextents) |
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{ |
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struct xfs_efi_log_item *efip; |
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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))); |
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efip = kmem_zalloc(size, KM_SLEEP); |
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} else { |
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efip = kmem_zone_zalloc(xfs_efi_zone, KM_SLEEP); |
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} |
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xfs_log_item_init(mp, &efip->efi_item, XFS_LI_EFI, &xfs_efi_item_ops); |
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efip->efi_format.efi_nextents = nextents; efip->efi_format.efi_id = (__psint_t)(void*)efip; |
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atomic_set(&efip->efi_next_extent, 0); |
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|
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return efip; |
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} /* |
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* 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) { |
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xfs_efi_log_format_t *src_efi_fmt = buf->i_addr; |
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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) { |
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xfs_efi_log_format_32_t *src_efi_fmt_32 = buf->i_addr; |
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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) { |
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xfs_efi_log_format_64_t *src_efi_fmt_64 = buf->i_addr; |
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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; } /* |
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* 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. |
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*/ void xfs_efi_release(xfs_efi_log_item_t *efip, uint nextents) { |
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ASSERT(atomic_read(&efip->efi_next_extent) >= nextents); if (atomic_sub_and_test(nextents, &efip->efi_next_extent)) __xfs_efi_release(efip); |
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} |
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static inline struct xfs_efd_log_item *EFD_ITEM(struct xfs_log_item *lip) |
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{ |
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return container_of(lip, struct xfs_efd_log_item, efd_item); } |
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|
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STATIC void xfs_efd_item_free(struct xfs_efd_log_item *efdp) { if (efdp->efd_format.efd_nextents > XFS_EFD_MAX_FAST_EXTENTS) |
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kmem_free(efdp); |
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else |
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kmem_zone_free(xfs_efd_zone, efdp); |
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} |
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/* * 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. */ |
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STATIC uint |
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xfs_efd_item_size( struct xfs_log_item *lip) |
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{ 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 |
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xfs_efd_item_format( struct xfs_log_item *lip, struct xfs_log_iovec *log_vector) |
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{ |
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struct xfs_efd_log_item *efdp = EFD_ITEM(lip); uint size; |
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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; |
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log_vector->i_addr = &efdp->efd_format; |
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log_vector->i_len = size; |
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log_vector->i_type = XLOG_REG_TYPE_EFD_FORMAT; |
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ASSERT(size >= sizeof(xfs_efd_log_format_t)); } |
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/* * Pinning has no meaning for an efd item, so just return. */ |
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STATIC void |
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xfs_efd_item_pin( struct xfs_log_item *lip) |
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{ |
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} |
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/* * Since pinning has no meaning for an efd item, unpinning does * not either. */ |
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STATIC void |
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xfs_efd_item_unpin( struct xfs_log_item *lip, int remove) |
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{ |
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} /* * Efd items have no locking, so just return success. */ |
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STATIC uint |
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xfs_efd_item_trylock( struct xfs_log_item *lip) |
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{ return XFS_ITEM_LOCKED; } /* * Efd items have no locking or pushing, so return failure * so that the caller doesn't bother with us. */ |
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STATIC void |
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xfs_efd_item_unlock( struct xfs_log_item *lip) |
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{ |
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if (lip->li_flags & XFS_LI_ABORTED) xfs_efd_item_free(EFD_ITEM(lip)); |
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} /* * 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. */ |
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STATIC xfs_lsn_t |
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xfs_efd_item_committed( struct xfs_log_item *lip, xfs_lsn_t lsn) |
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{ |
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struct xfs_efd_log_item *efdp = EFD_ITEM(lip); |
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/* * 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. */ |
7bfa31d8e xfs: give xfs_ite... |
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if (!(lip->li_flags & XFS_LI_ABORTED)) |
1da177e4c Linux-2.6.12-rc2 |
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xfs_efi_release(efdp->efd_efip, efdp->efd_format.efd_nextents); |
7d795ca34 [XFS] consolidate... |
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xfs_efd_item_free(efdp); |
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return (xfs_lsn_t)-1; } /* |
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* 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. */ |
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STATIC void |
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xfs_efd_item_push( struct xfs_log_item *lip) |
1da177e4c Linux-2.6.12-rc2 |
450 |
{ |
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} /* * 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. */ |
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STATIC void |
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xfs_efd_item_committing( struct xfs_log_item *lip, xfs_lsn_t lsn) |
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{ |
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} /* * This is the ops vector shared by all efd log items. */ |
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static const struct xfs_item_ops xfs_efd_item_ops = { |
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.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_trylock = xfs_efd_item_trylock, .iop_unlock = xfs_efd_item_unlock, .iop_committed = xfs_efd_item_committed, .iop_push = xfs_efd_item_push, .iop_committing = xfs_efd_item_committing |
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}; |
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/* * Allocate and initialize an efd item with the given number of extents. */ |
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struct xfs_efd_log_item * xfs_efd_init( struct xfs_mount *mp, struct xfs_efi_log_item *efip, uint nextents) |
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{ |
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struct xfs_efd_log_item *efdp; |
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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))); |
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efdp = kmem_zalloc(size, KM_SLEEP); |
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} else { |
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efdp = kmem_zone_zalloc(xfs_efd_zone, KM_SLEEP); |
1da177e4c Linux-2.6.12-rc2 |
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} |
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xfs_log_item_init(mp, &efdp->efd_item, XFS_LI_EFD, &xfs_efd_item_ops); |
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efdp->efd_efip = efip; efdp->efd_format.efd_nextents = nextents; efdp->efd_format.efd_efi_id = efip->efi_format.efi_id; |
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return efdp; |
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} |