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xfs: Pull EFI/EFD handling out from under the AIL lock

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EFI/EFD interactions are protected from races by the AIL lock. They
are the only type of log items that require the the AIL lock to
serialise internal state, so they need to be separated from the AIL
lock before we can do bulk insert operations on the AIL.

To acheive this, convert the counter of the number of extents in the
EFI to an atomic so it can be safely manipulated by EFD processing
without locks. Also, convert the EFI state flag manipulations to use
atomic bit operations so no locks are needed to record state
changes. Finally, use the state bits to determine when it is safe to
free the EFI and clean up the code to do this neatly.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Dave Chinner
2010-12-20 11:59:49 +11:00
committed by Dave Chinner
parent 9c5f8414ef
commit b199c8a4ba
4 changed files with 59 additions and 49 deletions
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9
fs/xfs/xfs_log_recover.c
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@ -2567,8 +2567,7 @@ xlog_recover_efi_pass2(
xfs_efi_item_free(efip);
return error;
}
efip->efi_next_extent = efi_formatp->efi_nextents;
efip->efi_flags |= XFS_EFI_COMMITTED;
atomic_set(&efip->efi_next_extent, efi_formatp->efi_nextents);
spin_lock(&log->l_ailp->xa_lock);
/*
@ -2878,7 +2877,7 @@ xlog_recover_process_efi(
xfs_extent_t *extp;
xfs_fsblock_t startblock_fsb;
ASSERT(!(efip->efi_flags & XFS_EFI_RECOVERED));
ASSERT(!test_bit(XFS_EFI_RECOVERED, &efip->efi_flags));
/*
* First check the validity of the extents described by the
@ -2917,7 +2916,7 @@ xlog_recover_process_efi(
extp->ext_len);
}
efip->efi_flags |= XFS_EFI_RECOVERED;
set_bit(XFS_EFI_RECOVERED, &efip->efi_flags);
error = xfs_trans_commit(tp, 0);
return error;
@ -2974,7 +2973,7 @@ xlog_recover_process_efis(
* Skip EFIs that we've already processed.
*/
efip = (xfs_efi_log_item_t *)lip;
if (efip->efi_flags & XFS_EFI_RECOVERED) {
if (test_bit(XFS_EFI_RECOVERED, &efip->efi_flags)) {
lip = xfs_trans_ail_cursor_next(ailp, &cur);
continue;
}