xfs: split out iclog writing from xfs_trans_commit()
Split the the part of xfs_trans_commit() that deals with writing the transaction into the iclog into a separate function. This isolates the physical commit process from the logical commit operation and makes it easier to insert different transaction commit paths without affecting the existing algorithm adversely. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Dave Chinner
Alex Elder
Родитель
713bf88bba
Коммит
0924378a68
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@ -47,8 +47,6 @@
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STATIC void xfs_trans_apply_sb_deltas(xfs_trans_t *);
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STATIC uint xfs_trans_count_vecs(xfs_trans_t *);
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STATIC void xfs_trans_fill_vecs(xfs_trans_t *, xfs_log_iovec_t *);
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STATIC void xfs_trans_uncommit(xfs_trans_t *, uint);
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STATIC void xfs_trans_committed(xfs_trans_t *, int);
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STATIC void xfs_trans_chunk_committed(xfs_log_item_chunk_t *, xfs_lsn_t, int);
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@ -764,94 +762,126 @@ xfs_trans_unreserve_and_mod_sb(
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}
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}
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/*
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* Total up the number of log iovecs needed to commit this
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* transaction. The transaction itself needs one for the
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* transaction header. Ask each dirty item in turn how many
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* it needs to get the total.
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*/
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static uint
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xfs_trans_count_vecs(
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xfs_trans_t *tp)
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{
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int nvecs;
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xfs_log_item_desc_t *lidp;
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nvecs = 1;
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lidp = xfs_trans_first_item(tp);
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ASSERT(lidp != NULL);
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/* In the non-debug case we need to start bailing out if we
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* didn't find a log_item here, return zero and let trans_commit
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* deal with it.
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*/
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if (lidp == NULL)
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return 0;
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while (lidp != NULL) {
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/*
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* Skip items which aren't dirty in this transaction.
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*/
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if (!(lidp->lid_flags & XFS_LID_DIRTY)) {
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lidp = xfs_trans_next_item(tp, lidp);
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continue;
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}
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lidp->lid_size = IOP_SIZE(lidp->lid_item);
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nvecs += lidp->lid_size;
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lidp = xfs_trans_next_item(tp, lidp);
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}
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return nvecs;
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}
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/*
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* xfs_trans_commit
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* Fill in the vector with pointers to data to be logged
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* by this transaction. The transaction header takes
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* the first vector, and then each dirty item takes the
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* number of vectors it indicated it needed in xfs_trans_count_vecs().
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*
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* Commit the given transaction to the log a/synchronously.
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*
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* XFS disk error handling mechanism is not based on a typical
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* transaction abort mechanism. Logically after the filesystem
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* gets marked 'SHUTDOWN', we can't let any new transactions
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* be durable - ie. committed to disk - because some metadata might
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* be inconsistent. In such cases, this returns an error, and the
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* caller may assume that all locked objects joined to the transaction
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* have already been unlocked as if the commit had succeeded.
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* Do not reference the transaction structure after this call.
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* As each item fills in the entries it needs, also pin the item
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* so that it cannot be flushed out until the log write completes.
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*/
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/*ARGSUSED*/
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int
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_xfs_trans_commit(
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xfs_trans_t *tp,
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uint flags,
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int *log_flushed)
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static void
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xfs_trans_fill_vecs(
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struct xfs_trans *tp,
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struct xfs_log_iovec *log_vector)
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{
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xfs_log_iovec_t *log_vector;
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int nvec;
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xfs_mount_t *mp;
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xfs_lsn_t commit_lsn;
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/* REFERENCED */
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int error;
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int log_flags;
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int sync;
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#define XFS_TRANS_LOGVEC_COUNT 16
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xfs_log_iovec_t log_vector_fast[XFS_TRANS_LOGVEC_COUNT];
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struct xlog_in_core *commit_iclog;
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int shutdown;
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commit_lsn = -1;
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xfs_log_item_desc_t *lidp;
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struct xfs_log_iovec *vecp;
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uint nitems;
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/*
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* Determine whether this commit is releasing a permanent
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* log reservation or not.
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* Skip over the entry for the transaction header, we'll
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* fill that in at the end.
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*/
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if (flags & XFS_TRANS_RELEASE_LOG_RES) {
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ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
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log_flags = XFS_LOG_REL_PERM_RESERV;
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} else {
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log_flags = 0;
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}
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mp = tp->t_mountp;
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vecp = log_vector + 1;
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/*
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* If there is nothing to be logged by the transaction,
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* then unlock all of the items associated with the
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* transaction and free the transaction structure.
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* Also make sure to return any reserved blocks to
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* the free pool.
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*/
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shut_us_down:
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shutdown = XFS_FORCED_SHUTDOWN(mp) ? EIO : 0;
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if (!(tp->t_flags & XFS_TRANS_DIRTY) || shutdown) {
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xfs_trans_unreserve_and_mod_sb(tp);
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/*
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* It is indeed possible for the transaction to be
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* not dirty but the dqinfo portion to be. All that
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* means is that we have some (non-persistent) quota
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* reservations that need to be unreserved.
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*/
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xfs_trans_unreserve_and_mod_dquots(tp);
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if (tp->t_ticket) {
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commit_lsn = xfs_log_done(mp, tp->t_ticket,
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NULL, log_flags);
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if (commit_lsn == -1 && !shutdown)
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shutdown = XFS_ERROR(EIO);
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nitems = 0;
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lidp = xfs_trans_first_item(tp);
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ASSERT(lidp);
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while (lidp) {
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/* Skip items which aren't dirty in this transaction. */
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if (!(lidp->lid_flags & XFS_LID_DIRTY)) {
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lidp = xfs_trans_next_item(tp, lidp);
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continue;
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}
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current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
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xfs_trans_free_items(tp, shutdown? XFS_TRANS_ABORT : 0);
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xfs_trans_free_busy(tp);
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xfs_trans_free(tp);
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XFS_STATS_INC(xs_trans_empty);
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return (shutdown);
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/*
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* The item may be marked dirty but not log anything. This can
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* be used to get called when a transaction is committed.
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*/
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if (lidp->lid_size)
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nitems++;
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IOP_FORMAT(lidp->lid_item, vecp);
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vecp += lidp->lid_size;
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IOP_PIN(lidp->lid_item);
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lidp = xfs_trans_next_item(tp, lidp);
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}
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ASSERT(tp->t_ticket != NULL);
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/*
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* If we need to update the superblock, then do it now.
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* Now that we've counted the number of items in this transaction, fill
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* in the transaction header. Note that the transaction header does not
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* have a log item.
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*/
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if (tp->t_flags & XFS_TRANS_SB_DIRTY)
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xfs_trans_apply_sb_deltas(tp);
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xfs_trans_apply_dquot_deltas(tp);
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tp->t_header.th_magic = XFS_TRANS_HEADER_MAGIC;
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tp->t_header.th_type = tp->t_type;
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tp->t_header.th_num_items = nitems;
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log_vector->i_addr = (xfs_caddr_t)&tp->t_header;
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log_vector->i_len = sizeof(xfs_trans_header_t);
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log_vector->i_type = XLOG_REG_TYPE_TRANSHDR;
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}
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/*
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* Format the transaction direct to the iclog. This isolates the physical
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* transaction commit operation from the logical operation and hence allows
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* other methods to be introduced without affecting the existing commit path.
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*/
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static int
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xfs_trans_commit_iclog(
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struct xfs_mount *mp,
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struct xfs_trans *tp,
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xfs_lsn_t *commit_lsn,
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int flags)
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{
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int shutdown;
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int error;
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int log_flags = 0;
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struct xlog_in_core *commit_iclog;
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#define XFS_TRANS_LOGVEC_COUNT 16
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struct xfs_log_iovec log_vector_fast[XFS_TRANS_LOGVEC_COUNT];
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struct xfs_log_iovec *log_vector;
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uint nvec;
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/*
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* Ask each log item how many log_vector entries it will
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@ -861,8 +891,7 @@ shut_us_down:
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*/
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nvec = xfs_trans_count_vecs(tp);
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if (nvec == 0) {
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xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR);
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goto shut_us_down;
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return ENOMEM; /* triggers a shutdown! */
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} else if (nvec <= XFS_TRANS_LOGVEC_COUNT) {
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log_vector = log_vector_fast;
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} else {
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@ -877,6 +906,9 @@ shut_us_down:
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*/
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xfs_trans_fill_vecs(tp, log_vector);
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if (flags & XFS_TRANS_RELEASE_LOG_RES)
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log_flags = XFS_LOG_REL_PERM_RESERV;
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error = xfs_log_write(mp, log_vector, nvec, tp->t_ticket, &(tp->t_lsn));
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/*
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@ -884,18 +916,17 @@ shut_us_down:
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* at any time after this call. However, all the items associated
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* with the transaction are still locked and pinned in memory.
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*/
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commit_lsn = xfs_log_done(mp, tp->t_ticket, &commit_iclog, log_flags);
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*commit_lsn = xfs_log_done(mp, tp->t_ticket, &commit_iclog, log_flags);
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tp->t_commit_lsn = commit_lsn;
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if (nvec > XFS_TRANS_LOGVEC_COUNT) {
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tp->t_commit_lsn = *commit_lsn;
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if (nvec > XFS_TRANS_LOGVEC_COUNT)
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kmem_free(log_vector);
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}
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/*
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* If we got a log write error. Unpin the logitems that we
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* had pinned, clean up, free trans structure, and return error.
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*/
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if (error || commit_lsn == -1) {
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if (error || *commit_lsn == -1) {
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current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
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xfs_trans_uncommit(tp, flags|XFS_TRANS_ABORT);
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return XFS_ERROR(EIO);
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@ -909,8 +940,6 @@ shut_us_down:
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*/
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xfs_trans_unreserve_and_mod_sb(tp);
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sync = tp->t_flags & XFS_TRANS_SYNC;
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/*
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* Tell the LM to call the transaction completion routine
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* when the log write with LSN commit_lsn completes (e.g.
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@ -953,7 +982,7 @@ shut_us_down:
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* the commit lsn of this transaction for dependency tracking
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* purposes.
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*/
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xfs_trans_unlock_items(tp, commit_lsn);
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xfs_trans_unlock_items(tp, *commit_lsn);
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/*
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* If we detected a log error earlier, finish committing
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@ -973,7 +1002,92 @@ shut_us_down:
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* and the items are released we can finally allow the iclog to
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* go to disk.
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*/
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error = xfs_log_release_iclog(mp, commit_iclog);
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return xfs_log_release_iclog(mp, commit_iclog);
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}
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/*
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* xfs_trans_commit
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*
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* Commit the given transaction to the log a/synchronously.
|
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*
|
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* XFS disk error handling mechanism is not based on a typical
|
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* transaction abort mechanism. Logically after the filesystem
|
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* gets marked 'SHUTDOWN', we can't let any new transactions
|
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* be durable - ie. committed to disk - because some metadata might
|
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* be inconsistent. In such cases, this returns an error, and the
|
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* caller may assume that all locked objects joined to the transaction
|
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* have already been unlocked as if the commit had succeeded.
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* Do not reference the transaction structure after this call.
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*/
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/*ARGSUSED*/
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int
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_xfs_trans_commit(
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xfs_trans_t *tp,
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uint flags,
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int *log_flushed)
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{
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xfs_mount_t *mp = tp->t_mountp;
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xfs_lsn_t commit_lsn = -1;
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int error;
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int log_flags = 0;
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int sync = tp->t_flags & XFS_TRANS_SYNC;
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int shutdown;
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/*
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* Determine whether this commit is releasing a permanent
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* log reservation or not.
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*/
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if (flags & XFS_TRANS_RELEASE_LOG_RES) {
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ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
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log_flags = XFS_LOG_REL_PERM_RESERV;
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}
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/*
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* If there is nothing to be logged by the transaction,
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* then unlock all of the items associated with the
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* transaction and free the transaction structure.
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* Also make sure to return any reserved blocks to
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* the free pool.
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*/
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shut_us_down:
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shutdown = XFS_FORCED_SHUTDOWN(mp) ? EIO : 0;
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if (!(tp->t_flags & XFS_TRANS_DIRTY) || shutdown) {
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xfs_trans_unreserve_and_mod_sb(tp);
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/*
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* It is indeed possible for the transaction to be
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* not dirty but the dqinfo portion to be. All that
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* means is that we have some (non-persistent) quota
|
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* reservations that need to be unreserved.
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*/
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xfs_trans_unreserve_and_mod_dquots(tp);
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if (tp->t_ticket) {
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commit_lsn = xfs_log_done(mp, tp->t_ticket,
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NULL, log_flags);
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if (commit_lsn == -1 && !shutdown)
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shutdown = XFS_ERROR(EIO);
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}
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current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
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xfs_trans_free_items(tp, shutdown? XFS_TRANS_ABORT : 0);
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xfs_trans_free_busy(tp);
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xfs_trans_free(tp);
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XFS_STATS_INC(xs_trans_empty);
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return (shutdown);
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}
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ASSERT(tp->t_ticket != NULL);
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/*
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* If we need to update the superblock, then do it now.
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*/
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if (tp->t_flags & XFS_TRANS_SB_DIRTY)
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xfs_trans_apply_sb_deltas(tp);
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xfs_trans_apply_dquot_deltas(tp);
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error = xfs_trans_commit_iclog(mp, tp, &commit_lsn, flags);
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if (error == ENOMEM) {
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xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR);
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goto shut_us_down;
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}
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/*
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* If the transaction needs to be synchronous, then force the
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@ -992,47 +1106,6 @@ shut_us_down:
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return (error);
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}
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/*
|
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* Total up the number of log iovecs needed to commit this
|
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* transaction. The transaction itself needs one for the
|
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* transaction header. Ask each dirty item in turn how many
|
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* it needs to get the total.
|
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*/
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STATIC uint
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xfs_trans_count_vecs(
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xfs_trans_t *tp)
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{
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int nvecs;
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xfs_log_item_desc_t *lidp;
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nvecs = 1;
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lidp = xfs_trans_first_item(tp);
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ASSERT(lidp != NULL);
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/* In the non-debug case we need to start bailing out if we
|
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* didn't find a log_item here, return zero and let trans_commit
|
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* deal with it.
|
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*/
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if (lidp == NULL)
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return 0;
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while (lidp != NULL) {
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/*
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* Skip items which aren't dirty in this transaction.
|
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*/
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if (!(lidp->lid_flags & XFS_LID_DIRTY)) {
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lidp = xfs_trans_next_item(tp, lidp);
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continue;
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}
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lidp->lid_size = IOP_SIZE(lidp->lid_item);
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nvecs += lidp->lid_size;
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lidp = xfs_trans_next_item(tp, lidp);
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}
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return nvecs;
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}
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|
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/*
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* Called from the trans_commit code when we notice that
|
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* the filesystem is in the middle of a forced shutdown.
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|
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@ -1062,68 +1135,6 @@ xfs_trans_uncommit(
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xfs_trans_free(tp);
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}
|
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|
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/*
|
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* Fill in the vector with pointers to data to be logged
|
||||
* by this transaction. The transaction header takes
|
||||
* the first vector, and then each dirty item takes the
|
||||
* number of vectors it indicated it needed in xfs_trans_count_vecs().
|
||||
*
|
||||
* As each item fills in the entries it needs, also pin the item
|
||||
* so that it cannot be flushed out until the log write completes.
|
||||
*/
|
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STATIC void
|
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xfs_trans_fill_vecs(
|
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xfs_trans_t *tp,
|
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xfs_log_iovec_t *log_vector)
|
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{
|
||||
xfs_log_item_desc_t *lidp;
|
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xfs_log_iovec_t *vecp;
|
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uint nitems;
|
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|
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/*
|
||||
* Skip over the entry for the transaction header, we'll
|
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* fill that in at the end.
|
||||
*/
|
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vecp = log_vector + 1; /* pointer arithmetic */
|
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nitems = 0;
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lidp = xfs_trans_first_item(tp);
|
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ASSERT(lidp != NULL);
|
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while (lidp != NULL) {
|
||||
/*
|
||||
* Skip items which aren't dirty in this transaction.
|
||||
*/
|
||||
if (!(lidp->lid_flags & XFS_LID_DIRTY)) {
|
||||
lidp = xfs_trans_next_item(tp, lidp);
|
||||
continue;
|
||||
}
|
||||
/*
|
||||
* The item may be marked dirty but not log anything.
|
||||
* This can be used to get called when a transaction
|
||||
* is committed.
|
||||
*/
|
||||
if (lidp->lid_size) {
|
||||
nitems++;
|
||||
}
|
||||
IOP_FORMAT(lidp->lid_item, vecp);
|
||||
vecp += lidp->lid_size; /* pointer arithmetic */
|
||||
IOP_PIN(lidp->lid_item);
|
||||
lidp = xfs_trans_next_item(tp, lidp);
|
||||
}
|
||||
|
||||
/*
|
||||
* Now that we've counted the number of items in this
|
||||
* transaction, fill in the transaction header.
|
||||
*/
|
||||
tp->t_header.th_magic = XFS_TRANS_HEADER_MAGIC;
|
||||
tp->t_header.th_type = tp->t_type;
|
||||
tp->t_header.th_num_items = nitems;
|
||||
log_vector->i_addr = (xfs_caddr_t)&tp->t_header;
|
||||
log_vector->i_len = sizeof(xfs_trans_header_t);
|
||||
log_vector->i_type = XLOG_REG_TYPE_TRANSHDR;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Unlock all of the transaction's items and free the transaction.
|
||||
* The transaction must not have modified any of its items, because
|
||||
|
|
|
|||
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