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linux
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xfs_trans_refcount.c
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// SPDX-License-Identifier: GPL-2.0+ /* * Copyright (C) 2016 Oracle. All Rights Reserved. * Author: Darrick J. Wong <darrick.wong@oracle.com> */ #include "xfs.h" #include "xfs_fs.h" #include "xfs_shared.h" #include "xfs_format.h" #include "xfs_log_format.h" #include "xfs_trans_resv.h" #include "xfs_mount.h" #include "xfs_defer.h" #include "xfs_trans.h" #include "xfs_trans_priv.h" #include "xfs_refcount_item.h" #include "xfs_alloc.h" #include "xfs_refcount.h" /* * This routine is called to allocate a "refcount update done" * log item. */ struct xfs_cud_log_item * xfs_trans_get_cud( struct xfs_trans *tp, struct xfs_cui_log_item *cuip) { struct xfs_cud_log_item *cudp; cudp = xfs_cud_init(tp->t_mountp, cuip); xfs_trans_add_item(tp, &cudp->cud_item); return cudp; } /* * Finish an refcount update and log it to the CUD. Note that the * transaction is marked dirty regardless of whether the refcount * update succeeds or fails to support the CUI/CUD lifecycle rules. */ int xfs_trans_log_finish_refcount_update( struct xfs_trans *tp, struct xfs_cud_log_item *cudp, enum xfs_refcount_intent_type type, xfs_fsblock_t startblock, xfs_extlen_t blockcount, xfs_fsblock_t *new_fsb, xfs_extlen_t *new_len, struct xfs_btree_cur **pcur) { int error; error = xfs_refcount_finish_one(tp, type, startblock, blockcount, new_fsb, new_len, pcur); /* * Mark the transaction dirty, even on error. This ensures the * transaction is aborted, which: * * 1.) releases the CUI and frees the CUD * 2.) shuts down the filesystem */ tp->t_flags |= XFS_TRANS_DIRTY; set_bit(XFS_LI_DIRTY, &cudp->cud_item.li_flags); return error; } /* Sort refcount intents by AG. */ static int xfs_refcount_update_diff_items( void *priv, struct list_head *a, struct list_head *b) { struct xfs_mount *mp = priv; struct xfs_refcount_intent *ra; struct xfs_refcount_intent *rb; ra = container_of(a, struct xfs_refcount_intent, ri_list); rb = container_of(b, struct xfs_refcount_intent, ri_list); return XFS_FSB_TO_AGNO(mp, ra->ri_startblock) - XFS_FSB_TO_AGNO(mp, rb->ri_startblock); } /* Get an CUI. */ STATIC void * xfs_refcount_update_create_intent( struct xfs_trans *tp, unsigned int count) { struct xfs_cui_log_item *cuip; ASSERT(tp != NULL); ASSERT(count > 0); cuip = xfs_cui_init(tp->t_mountp, count); ASSERT(cuip != NULL); /* * Get a log_item_desc to point at the new item. */ xfs_trans_add_item(tp, &cuip->cui_item); return cuip; } /* Set the phys extent flags for this reverse mapping. */ static void xfs_trans_set_refcount_flags( struct xfs_phys_extent *refc, enum xfs_refcount_intent_type type) { refc->pe_flags = 0; switch (type) { case XFS_REFCOUNT_INCREASE: case XFS_REFCOUNT_DECREASE: case XFS_REFCOUNT_ALLOC_COW: case XFS_REFCOUNT_FREE_COW: refc->pe_flags |= type; break; default: ASSERT(0); } } /* Log refcount updates in the intent item. */ STATIC void xfs_refcount_update_log_item( struct xfs_trans *tp, void *intent, struct list_head *item) { struct xfs_cui_log_item *cuip = intent; struct xfs_refcount_intent *refc; uint next_extent; struct xfs_phys_extent *ext; refc = container_of(item, struct xfs_refcount_intent, ri_list); tp->t_flags |= XFS_TRANS_DIRTY; set_bit(XFS_LI_DIRTY, &cuip->cui_item.li_flags); /* * atomic_inc_return gives us the value after the increment; * we want to use it as an array index so we need to subtract 1 from * it. */ next_extent = atomic_inc_return(&cuip->cui_next_extent) - 1; ASSERT(next_extent < cuip->cui_format.cui_nextents); ext = &cuip->cui_format.cui_extents[next_extent]; ext->pe_startblock = refc->ri_startblock; ext->pe_len = refc->ri_blockcount; xfs_trans_set_refcount_flags(ext, refc->ri_type); } /* Get an CUD so we can process all the deferred refcount updates. */ STATIC void * xfs_refcount_update_create_done( struct xfs_trans *tp, void *intent, unsigned int count) { return xfs_trans_get_cud(tp, intent); } /* Process a deferred refcount update. */ STATIC int xfs_refcount_update_finish_item( struct xfs_trans *tp, struct list_head *item, void *done_item, void **state) { struct xfs_refcount_intent *refc; xfs_fsblock_t new_fsb; xfs_extlen_t new_aglen; int error; refc = container_of(item, struct xfs_refcount_intent, ri_list); error = xfs_trans_log_finish_refcount_update(tp, done_item, refc->ri_type, refc->ri_startblock, refc->ri_blockcount, &new_fsb, &new_aglen, (struct xfs_btree_cur **)state); /* Did we run out of reservation? Requeue what we didn't finish. */ if (!error && new_aglen > 0) { ASSERT(refc->ri_type == XFS_REFCOUNT_INCREASE || refc->ri_type == XFS_REFCOUNT_DECREASE); refc->ri_startblock = new_fsb; refc->ri_blockcount = new_aglen; return -EAGAIN; } kmem_free(refc); return error; } /* Clean up after processing deferred refcounts. */ STATIC void xfs_refcount_update_finish_cleanup( struct xfs_trans *tp, void *state, int error) { struct xfs_btree_cur *rcur = state; xfs_refcount_finish_one_cleanup(tp, rcur, error); } /* Abort all pending CUIs. */ STATIC void xfs_refcount_update_abort_intent( void *intent) { xfs_cui_release(intent); } /* Cancel a deferred refcount update. */ STATIC void xfs_refcount_update_cancel_item( struct list_head *item) { struct xfs_refcount_intent *refc; refc = container_of(item, struct xfs_refcount_intent, ri_list); kmem_free(refc); } const struct xfs_defer_op_type xfs_refcount_update_defer_type = { .max_items = XFS_CUI_MAX_FAST_EXTENTS, .diff_items = xfs_refcount_update_diff_items, .create_intent = xfs_refcount_update_create_intent, .abort_intent = xfs_refcount_update_abort_intent, .log_item = xfs_refcount_update_log_item, .create_done = xfs_refcount_update_create_done, .finish_item = xfs_refcount_update_finish_item, .finish_cleanup = xfs_refcount_update_finish_cleanup, .cancel_item = xfs_refcount_update_cancel_item, };
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