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| 1 | +// SPDX-License-Identifier: GPL-2.0 |
| 2 | +/* |
| 3 | + * Copyright (c) 2020-2022, Red Hat, Inc. |
| 4 | + * All Rights Reserved. |
| 5 | + */ |
| 6 | +#include "xfs.h" |
| 7 | +#include "xfs_fs.h" |
| 8 | +#include "xfs_shared.h" |
| 9 | +#include "xfs_format.h" |
| 10 | +#include "xfs_log_format.h" |
| 11 | +#include "xfs_trans_resv.h" |
| 12 | +#include "xfs_mount.h" |
| 13 | +#include "xfs_inode.h" |
| 14 | +#include "xfs_trans.h" |
| 15 | +#include "xfs_trans_priv.h" |
| 16 | +#include "xfs_ag.h" |
| 17 | +#include "xfs_iunlink_item.h" |
| 18 | +#include "xfs_trace.h" |
| 19 | +#include "xfs_error.h" |
| 20 | + |
| 21 | +struct kmem_cache *xfs_iunlink_cache; |
| 22 | + |
| 23 | +static inline struct xfs_iunlink_item *IUL_ITEM(struct xfs_log_item *lip) |
| 24 | +{ |
| 25 | + return container_of(lip, struct xfs_iunlink_item, item); |
| 26 | +} |
| 27 | + |
| 28 | +static void |
| 29 | +xfs_iunlink_item_release( |
| 30 | + struct xfs_log_item *lip) |
| 31 | +{ |
| 32 | + struct xfs_iunlink_item *iup = IUL_ITEM(lip); |
| 33 | + |
| 34 | + xfs_perag_put(iup->pag); |
| 35 | + kmem_cache_free(xfs_iunlink_cache, IUL_ITEM(lip)); |
| 36 | +} |
| 37 | + |
| 38 | + |
| 39 | +static uint64_t |
| 40 | +xfs_iunlink_item_sort( |
| 41 | + struct xfs_log_item *lip) |
| 42 | +{ |
| 43 | + return IUL_ITEM(lip)->ip->i_ino; |
| 44 | +} |
| 45 | + |
| 46 | +/* |
| 47 | + * Look up the inode cluster buffer and log the on-disk unlinked inode change |
| 48 | + * we need to make. |
| 49 | + */ |
| 50 | +static int |
| 51 | +xfs_iunlink_log_dinode( |
| 52 | + struct xfs_trans *tp, |
| 53 | + struct xfs_iunlink_item *iup) |
| 54 | +{ |
| 55 | + struct xfs_mount *mp = tp->t_mountp; |
| 56 | + struct xfs_inode *ip = iup->ip; |
| 57 | + struct xfs_dinode *dip; |
| 58 | + struct xfs_buf *ibp; |
| 59 | + int offset; |
| 60 | + int error; |
| 61 | + |
| 62 | + error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &ibp); |
| 63 | + if (error) |
| 64 | + return error; |
| 65 | + /* |
| 66 | + * Don't log the unlinked field on stale buffers as this may be the |
| 67 | + * transaction that frees the inode cluster and relogging the buffer |
| 68 | + * here will incorrectly remove the stale state. |
| 69 | + */ |
| 70 | + if (ibp->b_flags & XBF_STALE) |
| 71 | + goto out; |
| 72 | + |
| 73 | + dip = xfs_buf_offset(ibp, ip->i_imap.im_boffset); |
| 74 | + |
| 75 | + /* Make sure the old pointer isn't garbage. */ |
| 76 | + if (be32_to_cpu(dip->di_next_unlinked) != iup->old_agino) { |
| 77 | + xfs_inode_verifier_error(ip, -EFSCORRUPTED, __func__, dip, |
| 78 | + sizeof(*dip), __this_address); |
| 79 | + error = -EFSCORRUPTED; |
| 80 | + goto out; |
| 81 | + } |
| 82 | + |
| 83 | + trace_xfs_iunlink_update_dinode(mp, iup->pag->pag_agno, |
| 84 | + XFS_INO_TO_AGINO(mp, ip->i_ino), |
| 85 | + be32_to_cpu(dip->di_next_unlinked), iup->next_agino); |
| 86 | + |
| 87 | + dip->di_next_unlinked = cpu_to_be32(iup->next_agino); |
| 88 | + offset = ip->i_imap.im_boffset + |
| 89 | + offsetof(struct xfs_dinode, di_next_unlinked); |
| 90 | + |
| 91 | + xfs_dinode_calc_crc(mp, dip); |
| 92 | + xfs_trans_inode_buf(tp, ibp); |
| 93 | + xfs_trans_log_buf(tp, ibp, offset, offset + sizeof(xfs_agino_t) - 1); |
| 94 | + return 0; |
| 95 | +out: |
| 96 | + xfs_trans_brelse(tp, ibp); |
| 97 | + return error; |
| 98 | +} |
| 99 | + |
| 100 | +/* |
| 101 | + * On precommit, we grab the inode cluster buffer for the inode number we were |
| 102 | + * passed, then update the next unlinked field for that inode in the buffer and |
| 103 | + * log the buffer. This ensures that the inode cluster buffer was logged in the |
| 104 | + * correct order w.r.t. other inode cluster buffers. We can then remove the |
| 105 | + * iunlink item from the transaction and release it as it is has now served it's |
| 106 | + * purpose. |
| 107 | + */ |
| 108 | +static int |
| 109 | +xfs_iunlink_item_precommit( |
| 110 | + struct xfs_trans *tp, |
| 111 | + struct xfs_log_item *lip) |
| 112 | +{ |
| 113 | + struct xfs_iunlink_item *iup = IUL_ITEM(lip); |
| 114 | + int error; |
| 115 | + |
| 116 | + error = xfs_iunlink_log_dinode(tp, iup); |
| 117 | + list_del(&lip->li_trans); |
| 118 | + xfs_iunlink_item_release(lip); |
| 119 | + return error; |
| 120 | +} |
| 121 | + |
| 122 | +static const struct xfs_item_ops xfs_iunlink_item_ops = { |
| 123 | + .iop_release = xfs_iunlink_item_release, |
| 124 | + .iop_sort = xfs_iunlink_item_sort, |
| 125 | + .iop_precommit = xfs_iunlink_item_precommit, |
| 126 | +}; |
| 127 | + |
| 128 | + |
| 129 | +/* |
| 130 | + * Initialize the inode log item for a newly allocated (in-core) inode. |
| 131 | + * |
| 132 | + * Inode extents can only reside within an AG. Hence specify the starting |
| 133 | + * block for the inode chunk by offset within an AG as well as the |
| 134 | + * length of the allocated extent. |
| 135 | + * |
| 136 | + * This joins the item to the transaction and marks it dirty so |
| 137 | + * that we don't need a separate call to do this, nor does the |
| 138 | + * caller need to know anything about the iunlink item. |
| 139 | + */ |
| 140 | +int |
| 141 | +xfs_iunlink_log_inode( |
| 142 | + struct xfs_trans *tp, |
| 143 | + struct xfs_inode *ip, |
| 144 | + struct xfs_perag *pag, |
| 145 | + xfs_agino_t next_agino) |
| 146 | +{ |
| 147 | + struct xfs_mount *mp = tp->t_mountp; |
| 148 | + struct xfs_iunlink_item *iup; |
| 149 | + |
| 150 | + ASSERT(xfs_verify_agino_or_null(pag, next_agino)); |
| 151 | + ASSERT(xfs_verify_agino_or_null(pag, ip->i_next_unlinked)); |
| 152 | + |
| 153 | + /* |
| 154 | + * Since we're updating a linked list, we should never find that the |
| 155 | + * current pointer is the same as the new value, unless we're |
| 156 | + * terminating the list. |
| 157 | + */ |
| 158 | + if (ip->i_next_unlinked == next_agino) { |
| 159 | + if (next_agino != NULLAGINO) |
| 160 | + return -EFSCORRUPTED; |
| 161 | + return 0; |
| 162 | + } |
| 163 | + |
| 164 | + iup = kmem_cache_zalloc(xfs_iunlink_cache, GFP_KERNEL | __GFP_NOFAIL); |
| 165 | + xfs_log_item_init(mp, &iup->item, XFS_LI_IUNLINK, |
| 166 | + &xfs_iunlink_item_ops); |
| 167 | + |
| 168 | + iup->ip = ip; |
| 169 | + iup->next_agino = next_agino; |
| 170 | + iup->old_agino = ip->i_next_unlinked; |
| 171 | + |
| 172 | + atomic_inc(&pag->pag_ref); |
| 173 | + iup->pag = pag; |
| 174 | + |
| 175 | + xfs_trans_add_item(tp, &iup->item); |
| 176 | + tp->t_flags |= XFS_TRANS_DIRTY; |
| 177 | + set_bit(XFS_LI_DIRTY, &iup->item.li_flags); |
| 178 | + return 0; |
| 179 | +} |
| 180 | + |
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