2022-07-13 18:47:42 -07:00
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2020-2022, Red Hat, Inc.
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* All Rights Reserved.
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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_shared.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_mount.h"
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#include "xfs_inode.h"
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#include "xfs_trans.h"
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#include "xfs_trans_priv.h"
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#include "xfs_ag.h"
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#include "xfs_iunlink_item.h"
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#include "xfs_trace.h"
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#include "xfs_error.h"
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struct kmem_cache *xfs_iunlink_cache;
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static inline struct xfs_iunlink_item *IUL_ITEM(struct xfs_log_item *lip)
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{
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return container_of(lip, struct xfs_iunlink_item, item);
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}
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static void
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xfs_iunlink_item_release(
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struct xfs_log_item *lip)
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{
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struct xfs_iunlink_item *iup = IUL_ITEM(lip);
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xfs_perag_put(iup->pag);
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kmem_cache_free(xfs_iunlink_cache, IUL_ITEM(lip));
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}
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static uint64_t
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xfs_iunlink_item_sort(
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struct xfs_log_item *lip)
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{
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return IUL_ITEM(lip)->ip->i_ino;
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}
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/*
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* Look up the inode cluster buffer and log the on-disk unlinked inode change
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* we need to make.
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*/
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static int
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xfs_iunlink_log_dinode(
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struct xfs_trans *tp,
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struct xfs_iunlink_item *iup)
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{
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struct xfs_mount *mp = tp->t_mountp;
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struct xfs_inode *ip = iup->ip;
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struct xfs_dinode *dip;
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struct xfs_buf *ibp;
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int offset;
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int error;
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error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &ibp);
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if (error)
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return error;
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/*
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* Don't log the unlinked field on stale buffers as this may be the
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* transaction that frees the inode cluster and relogging the buffer
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* here will incorrectly remove the stale state.
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*/
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if (ibp->b_flags & XBF_STALE)
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goto out;
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dip = xfs_buf_offset(ibp, ip->i_imap.im_boffset);
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/* Make sure the old pointer isn't garbage. */
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if (be32_to_cpu(dip->di_next_unlinked) != iup->old_agino) {
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xfs_inode_verifier_error(ip, -EFSCORRUPTED, __func__, dip,
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sizeof(*dip), __this_address);
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error = -EFSCORRUPTED;
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goto out;
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}
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trace_xfs_iunlink_update_dinode(mp, iup->pag->pag_agno,
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XFS_INO_TO_AGINO(mp, ip->i_ino),
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be32_to_cpu(dip->di_next_unlinked), iup->next_agino);
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dip->di_next_unlinked = cpu_to_be32(iup->next_agino);
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offset = ip->i_imap.im_boffset +
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offsetof(struct xfs_dinode, di_next_unlinked);
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xfs_dinode_calc_crc(mp, dip);
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xfs_trans_inode_buf(tp, ibp);
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xfs_trans_log_buf(tp, ibp, offset, offset + sizeof(xfs_agino_t) - 1);
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return 0;
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out:
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xfs_trans_brelse(tp, ibp);
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return error;
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}
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/*
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* On precommit, we grab the inode cluster buffer for the inode number we were
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* passed, then update the next unlinked field for that inode in the buffer and
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* log the buffer. This ensures that the inode cluster buffer was logged in the
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* correct order w.r.t. other inode cluster buffers. We can then remove the
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* iunlink item from the transaction and release it as it is has now served it's
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* purpose.
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*/
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static int
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xfs_iunlink_item_precommit(
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struct xfs_trans *tp,
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struct xfs_log_item *lip)
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{
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struct xfs_iunlink_item *iup = IUL_ITEM(lip);
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int error;
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error = xfs_iunlink_log_dinode(tp, iup);
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list_del(&lip->li_trans);
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xfs_iunlink_item_release(lip);
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return error;
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}
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static const struct xfs_item_ops xfs_iunlink_item_ops = {
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.iop_release = xfs_iunlink_item_release,
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.iop_sort = xfs_iunlink_item_sort,
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.iop_precommit = xfs_iunlink_item_precommit,
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};
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/*
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* Initialize the inode log item for a newly allocated (in-core) inode.
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*
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* Inode extents can only reside within an AG. Hence specify the starting
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* block for the inode chunk by offset within an AG as well as the
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* length of the allocated extent.
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*
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* This joins the item to the transaction and marks it dirty so
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* that we don't need a separate call to do this, nor does the
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* caller need to know anything about the iunlink item.
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*/
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int
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xfs_iunlink_log_inode(
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struct xfs_trans *tp,
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struct xfs_inode *ip,
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struct xfs_perag *pag,
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xfs_agino_t next_agino)
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{
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struct xfs_mount *mp = tp->t_mountp;
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struct xfs_iunlink_item *iup;
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ASSERT(xfs_verify_agino_or_null(pag, next_agino));
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ASSERT(xfs_verify_agino_or_null(pag, ip->i_next_unlinked));
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/*
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* Since we're updating a linked list, we should never find that the
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* current pointer is the same as the new value, unless we're
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* terminating the list.
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*/
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if (ip->i_next_unlinked == next_agino) {
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if (next_agino != NULLAGINO)
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return -EFSCORRUPTED;
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return 0;
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}
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iup = kmem_cache_zalloc(xfs_iunlink_cache, GFP_KERNEL | __GFP_NOFAIL);
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xfs_log_item_init(mp, &iup->item, XFS_LI_IUNLINK,
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&xfs_iunlink_item_ops);
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iup->ip = ip;
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iup->next_agino = next_agino;
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iup->old_agino = ip->i_next_unlinked;
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2023-04-11 18:59:55 -07:00
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iup->pag = xfs_perag_hold(pag);
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2022-07-13 18:47:42 -07:00
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xfs_trans_add_item(tp, &iup->item);
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tp->t_flags |= XFS_TRANS_DIRTY;
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set_bit(XFS_LI_DIRTY, &iup->item.li_flags);
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return 0;
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}
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