// 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_format.h" #include "xfs_log_format.h" #include "xfs_trans_resv.h" #include "xfs_bit.h" #include "xfs_shared.h" #include "xfs_mount.h" #include "xfs_defer.h" #include "xfs_inode.h" #include "xfs_trans.h" #include "xfs_trans_priv.h" #include "xfs_bmap_item.h" #include "xfs_log.h" #include "xfs_bmap.h" #include "xfs_icache.h" #include "xfs_bmap_btree.h" #include "xfs_trans_space.h" #include "xfs_error.h" #include "xfs_log_priv.h" #include "xfs_log_recover.h" struct kmem_cache *xfs_bui_cache; struct kmem_cache *xfs_bud_cache; static const struct xfs_item_ops xfs_bui_item_ops; static inline struct xfs_bui_log_item *BUI_ITEM(struct xfs_log_item *lip) { return container_of(lip, struct xfs_bui_log_item, bui_item); } STATIC void xfs_bui_item_free( struct xfs_bui_log_item *buip) { kmem_free(buip->bui_item.li_lv_shadow); kmem_cache_free(xfs_bui_cache, buip); } /* * Freeing the BUI requires that we remove it from the AIL if it has already * been placed there. However, the BUI may not yet have been placed in the AIL * when called by xfs_bui_release() from BUD processing due to the ordering of * committed vs unpin operations in bulk insert operations. Hence the reference * count to ensure only the last caller frees the BUI. */ STATIC void xfs_bui_release( struct xfs_bui_log_item *buip) { ASSERT(atomic_read(&buip->bui_refcount) > 0); if (!atomic_dec_and_test(&buip->bui_refcount)) return; xfs_trans_ail_delete(&buip->bui_item, 0); xfs_bui_item_free(buip); } STATIC void xfs_bui_item_size( struct xfs_log_item *lip, int *nvecs, int *nbytes) { struct xfs_bui_log_item *buip = BUI_ITEM(lip); *nvecs += 1; *nbytes += xfs_bui_log_format_sizeof(buip->bui_format.bui_nextents); } /* * This is called to fill in the vector of log iovecs for the * given bui log item. We use only 1 iovec, and we point that * at the bui_log_format structure embedded in the bui item. * It is at this point that we assert that all of the extent * slots in the bui item have been filled. */ STATIC void xfs_bui_item_format( struct xfs_log_item *lip, struct xfs_log_vec *lv) { struct xfs_bui_log_item *buip = BUI_ITEM(lip); struct xfs_log_iovec *vecp = NULL; ASSERT(atomic_read(&buip->bui_next_extent) == buip->bui_format.bui_nextents); buip->bui_format.bui_type = XFS_LI_BUI; buip->bui_format.bui_size = 1; xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_BUI_FORMAT, &buip->bui_format, xfs_bui_log_format_sizeof(buip->bui_format.bui_nextents)); } /* * The unpin operation is the last place an BUI is manipulated in the log. It is * either inserted in the AIL or aborted in the event of a log I/O error. In * either case, the BUI transaction has been successfully committed to make it * this far. Therefore, we expect whoever committed the BUI to either construct * and commit the BUD or drop the BUD's reference in the event of error. Simply * drop the log's BUI reference now that the log is done with it. */ STATIC void xfs_bui_item_unpin( struct xfs_log_item *lip, int remove) { struct xfs_bui_log_item *buip = BUI_ITEM(lip); xfs_bui_release(buip); } /* * The BUI has been either committed or aborted if the transaction has been * cancelled. If the transaction was cancelled, an BUD isn't going to be * constructed and thus we free the BUI here directly. */ STATIC void xfs_bui_item_release( struct xfs_log_item *lip) { xfs_bui_release(BUI_ITEM(lip)); } /* * Allocate and initialize an bui item with the given number of extents. */ STATIC struct xfs_bui_log_item * xfs_bui_init( struct xfs_mount *mp) { struct xfs_bui_log_item *buip; buip = kmem_cache_zalloc(xfs_bui_cache, GFP_KERNEL | __GFP_NOFAIL); xfs_log_item_init(mp, &buip->bui_item, XFS_LI_BUI, &xfs_bui_item_ops); buip->bui_format.bui_nextents = XFS_BUI_MAX_FAST_EXTENTS; buip->bui_format.bui_id = (uintptr_t)(void *)buip; atomic_set(&buip->bui_next_extent, 0); atomic_set(&buip->bui_refcount, 2); return buip; } static inline struct xfs_bud_log_item *BUD_ITEM(struct xfs_log_item *lip) { return container_of(lip, struct xfs_bud_log_item, bud_item); } STATIC void xfs_bud_item_size( struct xfs_log_item *lip, int *nvecs, int *nbytes) { *nvecs += 1; *nbytes += sizeof(struct xfs_bud_log_format); } /* * This is called to fill in the vector of log iovecs for the * given bud log item. We use only 1 iovec, and we point that * at the bud_log_format structure embedded in the bud item. * It is at this point that we assert that all of the extent * slots in the bud item have been filled. */ STATIC void xfs_bud_item_format( struct xfs_log_item *lip, struct xfs_log_vec *lv) { struct xfs_bud_log_item *budp = BUD_ITEM(lip); struct xfs_log_iovec *vecp = NULL; budp->bud_format.bud_type = XFS_LI_BUD; budp->bud_format.bud_size = 1; xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_BUD_FORMAT, &budp->bud_format, sizeof(struct xfs_bud_log_format)); } /* * The BUD is either committed or aborted if the transaction is cancelled. If * the transaction is cancelled, drop our reference to the BUI and free the * BUD. */ STATIC void xfs_bud_item_release( struct xfs_log_item *lip) { struct xfs_bud_log_item *budp = BUD_ITEM(lip); xfs_bui_release(budp->bud_buip); kmem_free(budp->bud_item.li_lv_shadow); kmem_cache_free(xfs_bud_cache, budp); } static struct xfs_log_item * xfs_bud_item_intent( struct xfs_log_item *lip) { return &BUD_ITEM(lip)->bud_buip->bui_item; } static const struct xfs_item_ops xfs_bud_item_ops = { .flags = XFS_ITEM_RELEASE_WHEN_COMMITTED | XFS_ITEM_INTENT_DONE, .iop_size = xfs_bud_item_size, .iop_format = xfs_bud_item_format, .iop_release = xfs_bud_item_release, .iop_intent = xfs_bud_item_intent, }; static struct xfs_bud_log_item * xfs_trans_get_bud( struct xfs_trans *tp, struct xfs_bui_log_item *buip) { struct xfs_bud_log_item *budp; budp = kmem_cache_zalloc(xfs_bud_cache, GFP_KERNEL | __GFP_NOFAIL); xfs_log_item_init(tp->t_mountp, &budp->bud_item, XFS_LI_BUD, &xfs_bud_item_ops); budp->bud_buip = buip; budp->bud_format.bud_bui_id = buip->bui_format.bui_id; xfs_trans_add_item(tp, &budp->bud_item); return budp; } /* * Finish an bmap update and log it to the BUD. Note that the * transaction is marked dirty regardless of whether the bmap update * succeeds or fails to support the BUI/BUD lifecycle rules. */ static int xfs_trans_log_finish_bmap_update( struct xfs_trans *tp, struct xfs_bud_log_item *budp, enum xfs_bmap_intent_type type, struct xfs_inode *ip, int whichfork, xfs_fileoff_t startoff, xfs_fsblock_t startblock, xfs_filblks_t *blockcount, xfs_exntst_t state) { int error; error = xfs_bmap_finish_one(tp, ip, type, whichfork, startoff, startblock, blockcount, state); /* * Mark the transaction dirty, even on error. This ensures the * transaction is aborted, which: * * 1.) releases the BUI and frees the BUD * 2.) shuts down the filesystem */ tp->t_flags |= XFS_TRANS_DIRTY | XFS_TRANS_HAS_INTENT_DONE; set_bit(XFS_LI_DIRTY, &budp->bud_item.li_flags); return error; } /* Sort bmap intents by inode. */ static int xfs_bmap_update_diff_items( void *priv, const struct list_head *a, const struct list_head *b) { struct xfs_bmap_intent *ba; struct xfs_bmap_intent *bb; ba = container_of(a, struct xfs_bmap_intent, bi_list); bb = container_of(b, struct xfs_bmap_intent, bi_list); return ba->bi_owner->i_ino - bb->bi_owner->i_ino; } /* Set the map extent flags for this mapping. */ static void xfs_trans_set_bmap_flags( struct xfs_map_extent *bmap, enum xfs_bmap_intent_type type, int whichfork, xfs_exntst_t state) { bmap->me_flags = 0; switch (type) { case XFS_BMAP_MAP: case XFS_BMAP_UNMAP: bmap->me_flags = type; break; default: ASSERT(0); } if (state == XFS_EXT_UNWRITTEN) bmap->me_flags |= XFS_BMAP_EXTENT_UNWRITTEN; if (whichfork == XFS_ATTR_FORK) bmap->me_flags |= XFS_BMAP_EXTENT_ATTR_FORK; } /* Log bmap updates in the intent item. */ STATIC void xfs_bmap_update_log_item( struct xfs_trans *tp, struct xfs_bui_log_item *buip, struct xfs_bmap_intent *bmap) { uint next_extent; struct xfs_map_extent *map; tp->t_flags |= XFS_TRANS_DIRTY; set_bit(XFS_LI_DIRTY, &buip->bui_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(&buip->bui_next_extent) - 1; ASSERT(next_extent < buip->bui_format.bui_nextents); map = &buip->bui_format.bui_extents[next_extent]; map->me_owner = bmap->bi_owner->i_ino; map->me_startblock = bmap->bi_bmap.br_startblock; map->me_startoff = bmap->bi_bmap.br_startoff; map->me_len = bmap->bi_bmap.br_blockcount; xfs_trans_set_bmap_flags(map, bmap->bi_type, bmap->bi_whichfork, bmap->bi_bmap.br_state); } static struct xfs_log_item * xfs_bmap_update_create_intent( struct xfs_trans *tp, struct list_head *items, unsigned int count, bool sort) { struct xfs_mount *mp = tp->t_mountp; struct xfs_bui_log_item *buip = xfs_bui_init(mp); struct xfs_bmap_intent *bmap; ASSERT(count == XFS_BUI_MAX_FAST_EXTENTS); xfs_trans_add_item(tp, &buip->bui_item); if (sort) list_sort(mp, items, xfs_bmap_update_diff_items); list_for_each_entry(bmap, items, bi_list) xfs_bmap_update_log_item(tp, buip, bmap); return &buip->bui_item; } /* Get an BUD so we can process all the deferred rmap updates. */ static struct xfs_log_item * xfs_bmap_update_create_done( struct xfs_trans *tp, struct xfs_log_item *intent, unsigned int count) { return &xfs_trans_get_bud(tp, BUI_ITEM(intent))->bud_item; } /* Process a deferred rmap update. */ STATIC int xfs_bmap_update_finish_item( struct xfs_trans *tp, struct xfs_log_item *done, struct list_head *item, struct xfs_btree_cur **state) { struct xfs_bmap_intent *bmap; xfs_filblks_t count; int error; bmap = container_of(item, struct xfs_bmap_intent, bi_list); count = bmap->bi_bmap.br_blockcount; error = xfs_trans_log_finish_bmap_update(tp, BUD_ITEM(done), bmap->bi_type, bmap->bi_owner, bmap->bi_whichfork, bmap->bi_bmap.br_startoff, bmap->bi_bmap.br_startblock, &count, bmap->bi_bmap.br_state); if (!error && count > 0) { ASSERT(bmap->bi_type == XFS_BMAP_UNMAP); bmap->bi_bmap.br_blockcount = count; return -EAGAIN; } kmem_cache_free(xfs_bmap_intent_cache, bmap); return error; } /* Abort all pending BUIs. */ STATIC void xfs_bmap_update_abort_intent( struct xfs_log_item *intent) { xfs_bui_release(BUI_ITEM(intent)); } /* Cancel a deferred rmap update. */ STATIC void xfs_bmap_update_cancel_item( struct list_head *item) { struct xfs_bmap_intent *bmap; bmap = container_of(item, struct xfs_bmap_intent, bi_list); kmem_cache_free(xfs_bmap_intent_cache, bmap); } const struct xfs_defer_op_type xfs_bmap_update_defer_type = { .max_items = XFS_BUI_MAX_FAST_EXTENTS, .create_intent = xfs_bmap_update_create_intent, .abort_intent = xfs_bmap_update_abort_intent, .create_done = xfs_bmap_update_create_done, .finish_item = xfs_bmap_update_finish_item, .cancel_item = xfs_bmap_update_cancel_item, }; /* Is this recovered BUI ok? */ static inline bool xfs_bui_validate( struct xfs_mount *mp, struct xfs_bui_log_item *buip) { struct xfs_map_extent *bmap; /* Only one mapping operation per BUI... */ if (buip->bui_format.bui_nextents != XFS_BUI_MAX_FAST_EXTENTS) return false; bmap = &buip->bui_format.bui_extents[0]; if (bmap->me_flags & ~XFS_BMAP_EXTENT_FLAGS) return false; switch (bmap->me_flags & XFS_BMAP_EXTENT_TYPE_MASK) { case XFS_BMAP_MAP: case XFS_BMAP_UNMAP: break; default: return false; } if (!xfs_verify_ino(mp, bmap->me_owner)) return false; if (!xfs_verify_fileext(mp, bmap->me_startoff, bmap->me_len)) return false; return xfs_verify_fsbext(mp, bmap->me_startblock, bmap->me_len); } /* * Process a bmap update intent item that was recovered from the log. * We need to update some inode's bmbt. */ STATIC int xfs_bui_item_recover( struct xfs_log_item *lip, struct list_head *capture_list) { struct xfs_bmbt_irec irec; struct xfs_bui_log_item *buip = BUI_ITEM(lip); struct xfs_trans *tp; struct xfs_inode *ip = NULL; struct xfs_mount *mp = lip->li_log->l_mp; struct xfs_map_extent *bmap; struct xfs_bud_log_item *budp; xfs_filblks_t count; xfs_exntst_t state; unsigned int bui_type; int whichfork; int iext_delta; int error = 0; if (!xfs_bui_validate(mp, buip)) { XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, &buip->bui_format, sizeof(buip->bui_format)); return -EFSCORRUPTED; } bmap = &buip->bui_format.bui_extents[0]; state = (bmap->me_flags & XFS_BMAP_EXTENT_UNWRITTEN) ? XFS_EXT_UNWRITTEN : XFS_EXT_NORM; whichfork = (bmap->me_flags & XFS_BMAP_EXTENT_ATTR_FORK) ? XFS_ATTR_FORK : XFS_DATA_FORK; bui_type = bmap->me_flags & XFS_BMAP_EXTENT_TYPE_MASK; error = xlog_recover_iget(mp, bmap->me_owner, &ip); if (error) return error; /* Allocate transaction and do the work. */ error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK), 0, 0, &tp); if (error) goto err_rele; budp = xfs_trans_get_bud(tp, buip); xfs_ilock(ip, XFS_ILOCK_EXCL); xfs_trans_ijoin(tp, ip, 0); if (bui_type == XFS_BMAP_MAP) iext_delta = XFS_IEXT_ADD_NOSPLIT_CNT; else iext_delta = XFS_IEXT_PUNCH_HOLE_CNT; error = xfs_iext_count_may_overflow(ip, whichfork, iext_delta); if (error == -EFBIG) error = xfs_iext_count_upgrade(tp, ip, iext_delta); if (error) goto err_cancel; count = bmap->me_len; error = xfs_trans_log_finish_bmap_update(tp, budp, bui_type, ip, whichfork, bmap->me_startoff, bmap->me_startblock, &count, state); if (error == -EFSCORRUPTED) XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bmap, sizeof(*bmap)); if (error) goto err_cancel; if (count > 0) { ASSERT(bui_type == XFS_BMAP_UNMAP); irec.br_startblock = bmap->me_startblock; irec.br_blockcount = count; irec.br_startoff = bmap->me_startoff; irec.br_state = state; xfs_bmap_unmap_extent(tp, ip, &irec); } /* * Commit transaction, which frees the transaction and saves the inode * for later replay activities. */ error = xfs_defer_ops_capture_and_commit(tp, capture_list); if (error) goto err_unlock; xfs_iunlock(ip, XFS_ILOCK_EXCL); xfs_irele(ip); return 0; err_cancel: xfs_trans_cancel(tp); err_unlock: xfs_iunlock(ip, XFS_ILOCK_EXCL); err_rele: xfs_irele(ip); return error; } STATIC bool xfs_bui_item_match( struct xfs_log_item *lip, uint64_t intent_id) { return BUI_ITEM(lip)->bui_format.bui_id == intent_id; } /* Relog an intent item to push the log tail forward. */ static struct xfs_log_item * xfs_bui_item_relog( struct xfs_log_item *intent, struct xfs_trans *tp) { struct xfs_bud_log_item *budp; struct xfs_bui_log_item *buip; struct xfs_map_extent *extp; unsigned int count; count = BUI_ITEM(intent)->bui_format.bui_nextents; extp = BUI_ITEM(intent)->bui_format.bui_extents; tp->t_flags |= XFS_TRANS_DIRTY; budp = xfs_trans_get_bud(tp, BUI_ITEM(intent)); set_bit(XFS_LI_DIRTY, &budp->bud_item.li_flags); buip = xfs_bui_init(tp->t_mountp); memcpy(buip->bui_format.bui_extents, extp, count * sizeof(*extp)); atomic_set(&buip->bui_next_extent, count); xfs_trans_add_item(tp, &buip->bui_item); set_bit(XFS_LI_DIRTY, &buip->bui_item.li_flags); return &buip->bui_item; } static const struct xfs_item_ops xfs_bui_item_ops = { .flags = XFS_ITEM_INTENT, .iop_size = xfs_bui_item_size, .iop_format = xfs_bui_item_format, .iop_unpin = xfs_bui_item_unpin, .iop_release = xfs_bui_item_release, .iop_recover = xfs_bui_item_recover, .iop_match = xfs_bui_item_match, .iop_relog = xfs_bui_item_relog, }; /* * Copy an BUI format buffer from the given buf, and into the destination * BUI format structure. The BUI/BUD items were designed not to need any * special alignment handling. */ static int xfs_bui_copy_format( struct xfs_log_iovec *buf, struct xfs_bui_log_format *dst_bui_fmt) { struct xfs_bui_log_format *src_bui_fmt; uint len; src_bui_fmt = buf->i_addr; len = xfs_bui_log_format_sizeof(src_bui_fmt->bui_nextents); if (buf->i_len == len) { memcpy(dst_bui_fmt, src_bui_fmt, len); return 0; } XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, NULL); return -EFSCORRUPTED; } /* * This routine is called to create an in-core extent bmap update * item from the bui format structure which was logged on disk. * It allocates an in-core bui, copies the extents from the format * structure into it, and adds the bui to the AIL with the given * LSN. */ STATIC int xlog_recover_bui_commit_pass2( struct xlog *log, struct list_head *buffer_list, struct xlog_recover_item *item, xfs_lsn_t lsn) { int error; struct xfs_mount *mp = log->l_mp; struct xfs_bui_log_item *buip; struct xfs_bui_log_format *bui_formatp; bui_formatp = item->ri_buf[0].i_addr; if (bui_formatp->bui_nextents != XFS_BUI_MAX_FAST_EXTENTS) { XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, log->l_mp); return -EFSCORRUPTED; } buip = xfs_bui_init(mp); error = xfs_bui_copy_format(&item->ri_buf[0], &buip->bui_format); if (error) { xfs_bui_item_free(buip); return error; } atomic_set(&buip->bui_next_extent, bui_formatp->bui_nextents); /* * Insert the intent into the AIL directly and drop one reference so * that finishing or canceling the work will drop the other. */ xfs_trans_ail_insert(log->l_ailp, &buip->bui_item, lsn); xfs_bui_release(buip); return 0; } const struct xlog_recover_item_ops xlog_bui_item_ops = { .item_type = XFS_LI_BUI, .commit_pass2 = xlog_recover_bui_commit_pass2, }; /* * This routine is called when an BUD format structure is found in a committed * transaction in the log. Its purpose is to cancel the corresponding BUI if it * was still in the log. To do this it searches the AIL for the BUI with an id * equal to that in the BUD format structure. If we find it we drop the BUD * reference, which removes the BUI from the AIL and frees it. */ STATIC int xlog_recover_bud_commit_pass2( struct xlog *log, struct list_head *buffer_list, struct xlog_recover_item *item, xfs_lsn_t lsn) { struct xfs_bud_log_format *bud_formatp; bud_formatp = item->ri_buf[0].i_addr; if (item->ri_buf[0].i_len != sizeof(struct xfs_bud_log_format)) { XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, log->l_mp); return -EFSCORRUPTED; } xlog_recover_release_intent(log, XFS_LI_BUI, bud_formatp->bud_bui_id); return 0; } const struct xlog_recover_item_ops xlog_bud_item_ops = { .item_type = XFS_LI_BUD, .commit_pass2 = xlog_recover_bud_commit_pass2, };