diff options
Diffstat (limited to 'fs/xfs/xfs_exchmaps_item.c')
| -rw-r--r-- | fs/xfs/xfs_exchmaps_item.c | 614 |
1 files changed, 614 insertions, 0 deletions
diff --git a/fs/xfs/xfs_exchmaps_item.c b/fs/xfs/xfs_exchmaps_item.c new file mode 100644 index 000000000000..264a121c5e16 --- /dev/null +++ b/fs/xfs/xfs_exchmaps_item.c @@ -0,0 +1,614 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (c) 2020-2024 Oracle. All Rights Reserved. + * Author: Darrick J. Wong <djwong@kernel.org> + */ +#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_exchmaps_item.h" +#include "xfs_exchmaps.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" +#include "xfs_exchrange.h" +#include "xfs_trace.h" + +struct kmem_cache *xfs_xmi_cache; +struct kmem_cache *xfs_xmd_cache; + +static const struct xfs_item_ops xfs_xmi_item_ops; + +static inline struct xfs_xmi_log_item *XMI_ITEM(struct xfs_log_item *lip) +{ + return container_of(lip, struct xfs_xmi_log_item, xmi_item); +} + +STATIC void +xfs_xmi_item_free( + struct xfs_xmi_log_item *xmi_lip) +{ + kvfree(xmi_lip->xmi_item.li_lv_shadow); + kmem_cache_free(xfs_xmi_cache, xmi_lip); +} + +/* + * Freeing the XMI requires that we remove it from the AIL if it has already + * been placed there. However, the XMI may not yet have been placed in the AIL + * when called by xfs_xmi_release() from XMD 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 XMI. + */ +STATIC void +xfs_xmi_release( + struct xfs_xmi_log_item *xmi_lip) +{ + ASSERT(atomic_read(&xmi_lip->xmi_refcount) > 0); + if (atomic_dec_and_test(&xmi_lip->xmi_refcount)) { + xfs_trans_ail_delete(&xmi_lip->xmi_item, 0); + xfs_xmi_item_free(xmi_lip); + } +} + + +STATIC void +xfs_xmi_item_size( + struct xfs_log_item *lip, + int *nvecs, + int *nbytes) +{ + *nvecs += 1; + *nbytes += sizeof(struct xfs_xmi_log_format); +} + +/* + * This is called to fill in the vector of log iovecs for the given xmi log + * item. We use only 1 iovec, and we point that at the xmi_log_format structure + * embedded in the xmi item. + */ +STATIC void +xfs_xmi_item_format( + struct xfs_log_item *lip, + struct xfs_log_vec *lv) +{ + struct xfs_xmi_log_item *xmi_lip = XMI_ITEM(lip); + struct xfs_log_iovec *vecp = NULL; + + xmi_lip->xmi_format.xmi_type = XFS_LI_XMI; + xmi_lip->xmi_format.xmi_size = 1; + + xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_XMI_FORMAT, + &xmi_lip->xmi_format, + sizeof(struct xfs_xmi_log_format)); +} + +/* + * The unpin operation is the last place an XMI 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 XMI transaction has been successfully committed to make it + * this far. Therefore, we expect whoever committed the XMI to either construct + * and commit the XMD or drop the XMD's reference in the event of error. Simply + * drop the log's XMI reference now that the log is done with it. + */ +STATIC void +xfs_xmi_item_unpin( + struct xfs_log_item *lip, + int remove) +{ + struct xfs_xmi_log_item *xmi_lip = XMI_ITEM(lip); + + xfs_xmi_release(xmi_lip); +} + +/* + * The XMI has been either committed or aborted if the transaction has been + * cancelled. If the transaction was cancelled, an XMD isn't going to be + * constructed and thus we free the XMI here directly. + */ +STATIC void +xfs_xmi_item_release( + struct xfs_log_item *lip) +{ + xfs_xmi_release(XMI_ITEM(lip)); +} + +/* Allocate and initialize an xmi item. */ +STATIC struct xfs_xmi_log_item * +xfs_xmi_init( + struct xfs_mount *mp) + +{ + struct xfs_xmi_log_item *xmi_lip; + + xmi_lip = kmem_cache_zalloc(xfs_xmi_cache, GFP_KERNEL | __GFP_NOFAIL); + + xfs_log_item_init(mp, &xmi_lip->xmi_item, XFS_LI_XMI, &xfs_xmi_item_ops); + xmi_lip->xmi_format.xmi_id = (uintptr_t)(void *)xmi_lip; + atomic_set(&xmi_lip->xmi_refcount, 2); + + return xmi_lip; +} + +static inline struct xfs_xmd_log_item *XMD_ITEM(struct xfs_log_item *lip) +{ + return container_of(lip, struct xfs_xmd_log_item, xmd_item); +} + +STATIC void +xfs_xmd_item_size( + struct xfs_log_item *lip, + int *nvecs, + int *nbytes) +{ + *nvecs += 1; + *nbytes += sizeof(struct xfs_xmd_log_format); +} + +/* + * This is called to fill in the vector of log iovecs for the given xmd log + * item. We use only 1 iovec, and we point that at the xmd_log_format structure + * embedded in the xmd item. + */ +STATIC void +xfs_xmd_item_format( + struct xfs_log_item *lip, + struct xfs_log_vec *lv) +{ + struct xfs_xmd_log_item *xmd_lip = XMD_ITEM(lip); + struct xfs_log_iovec *vecp = NULL; + + xmd_lip->xmd_format.xmd_type = XFS_LI_XMD; + xmd_lip->xmd_format.xmd_size = 1; + + xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_XMD_FORMAT, &xmd_lip->xmd_format, + sizeof(struct xfs_xmd_log_format)); +} + +/* + * The XMD is either committed or aborted if the transaction is cancelled. If + * the transaction is cancelled, drop our reference to the XMI and free the + * XMD. + */ +STATIC void +xfs_xmd_item_release( + struct xfs_log_item *lip) +{ + struct xfs_xmd_log_item *xmd_lip = XMD_ITEM(lip); + + xfs_xmi_release(xmd_lip->xmd_intent_log_item); + kvfree(xmd_lip->xmd_item.li_lv_shadow); + kmem_cache_free(xfs_xmd_cache, xmd_lip); +} + +static struct xfs_log_item * +xfs_xmd_item_intent( + struct xfs_log_item *lip) +{ + return &XMD_ITEM(lip)->xmd_intent_log_item->xmi_item; +} + +static const struct xfs_item_ops xfs_xmd_item_ops = { + .flags = XFS_ITEM_RELEASE_WHEN_COMMITTED | + XFS_ITEM_INTENT_DONE, + .iop_size = xfs_xmd_item_size, + .iop_format = xfs_xmd_item_format, + .iop_release = xfs_xmd_item_release, + .iop_intent = xfs_xmd_item_intent, +}; + +/* Log file mapping exchange information in the intent item. */ +STATIC struct xfs_log_item * +xfs_exchmaps_create_intent( + struct xfs_trans *tp, + struct list_head *items, + unsigned int count, + bool sort) +{ + struct xfs_xmi_log_item *xmi_lip; + struct xfs_exchmaps_intent *xmi; + struct xfs_xmi_log_format *xlf; + + ASSERT(count == 1); + + xmi = list_first_entry_or_null(items, struct xfs_exchmaps_intent, + xmi_list); + + xmi_lip = xfs_xmi_init(tp->t_mountp); + xlf = &xmi_lip->xmi_format; + + xlf->xmi_inode1 = xmi->xmi_ip1->i_ino; + xlf->xmi_igen1 = VFS_I(xmi->xmi_ip1)->i_generation; + xlf->xmi_inode2 = xmi->xmi_ip2->i_ino; + xlf->xmi_igen2 = VFS_I(xmi->xmi_ip2)->i_generation; + xlf->xmi_startoff1 = xmi->xmi_startoff1; + xlf->xmi_startoff2 = xmi->xmi_startoff2; + xlf->xmi_blockcount = xmi->xmi_blockcount; + xlf->xmi_isize1 = xmi->xmi_isize1; + xlf->xmi_isize2 = xmi->xmi_isize2; + xlf->xmi_flags = xmi->xmi_flags & XFS_EXCHMAPS_LOGGED_FLAGS; + + return &xmi_lip->xmi_item; +} + +STATIC struct xfs_log_item * +xfs_exchmaps_create_done( + struct xfs_trans *tp, + struct xfs_log_item *intent, + unsigned int count) +{ + struct xfs_xmi_log_item *xmi_lip = XMI_ITEM(intent); + struct xfs_xmd_log_item *xmd_lip; + + xmd_lip = kmem_cache_zalloc(xfs_xmd_cache, GFP_KERNEL | __GFP_NOFAIL); + xfs_log_item_init(tp->t_mountp, &xmd_lip->xmd_item, XFS_LI_XMD, + &xfs_xmd_item_ops); + xmd_lip->xmd_intent_log_item = xmi_lip; + xmd_lip->xmd_format.xmd_xmi_id = xmi_lip->xmi_format.xmi_id; + + return &xmd_lip->xmd_item; +} + +/* Add this deferred XMI to the transaction. */ +void +xfs_exchmaps_defer_add( + struct xfs_trans *tp, + struct xfs_exchmaps_intent *xmi) +{ + trace_xfs_exchmaps_defer(tp->t_mountp, xmi); + + xfs_defer_add(tp, &xmi->xmi_list, &xfs_exchmaps_defer_type); +} + +static inline struct xfs_exchmaps_intent *xmi_entry(const struct list_head *e) +{ + return list_entry(e, struct xfs_exchmaps_intent, xmi_list); +} + +/* Cancel a deferred file mapping exchange. */ +STATIC void +xfs_exchmaps_cancel_item( + struct list_head *item) +{ + struct xfs_exchmaps_intent *xmi = xmi_entry(item); + + kmem_cache_free(xfs_exchmaps_intent_cache, xmi); +} + +/* Process a deferred file mapping exchange. */ +STATIC int +xfs_exchmaps_finish_item( + struct xfs_trans *tp, + struct xfs_log_item *done, + struct list_head *item, + struct xfs_btree_cur **state) +{ + struct xfs_exchmaps_intent *xmi = xmi_entry(item); + int error; + + /* + * Exchange one more mappings between two files. If there's still more + * work to do, we want to requeue ourselves after all other pending + * deferred operations have finished. This includes all of the dfops + * that we queued directly as well as any new ones created in the + * process of finishing the others. Doing so prevents us from queuing + * a large number of XMI log items in kernel memory, which in turn + * prevents us from pinning the tail of the log (while logging those + * new XMI items) until the first XMI items can be processed. + */ + error = xfs_exchmaps_finish_one(tp, xmi); + if (error != -EAGAIN) + xfs_exchmaps_cancel_item(item); + return error; +} + +/* Abort all pending XMIs. */ +STATIC void +xfs_exchmaps_abort_intent( + struct xfs_log_item *intent) +{ + xfs_xmi_release(XMI_ITEM(intent)); +} + +/* Is this recovered XMI ok? */ +static inline bool +xfs_xmi_validate( + struct xfs_mount *mp, + struct xfs_xmi_log_item *xmi_lip) +{ + struct xfs_xmi_log_format *xlf = &xmi_lip->xmi_format; + + if (!xfs_has_exchange_range(mp)) + return false; + + if (xmi_lip->xmi_format.__pad != 0) + return false; + + if (xlf->xmi_flags & ~XFS_EXCHMAPS_LOGGED_FLAGS) + return false; + + if (!xfs_verify_ino(mp, xlf->xmi_inode1) || + !xfs_verify_ino(mp, xlf->xmi_inode2)) + return false; + + if (!xfs_verify_fileext(mp, xlf->xmi_startoff1, xlf->xmi_blockcount)) + return false; + + return xfs_verify_fileext(mp, xlf->xmi_startoff2, xlf->xmi_blockcount); +} + +/* + * Use the recovered log state to create a new request, estimate resource + * requirements, and create a new incore intent state. + */ +STATIC struct xfs_exchmaps_intent * +xfs_xmi_item_recover_intent( + struct xfs_mount *mp, + struct xfs_defer_pending *dfp, + const struct xfs_xmi_log_format *xlf, + struct xfs_exchmaps_req *req, + struct xfs_inode **ipp1, + struct xfs_inode **ipp2) +{ + struct xfs_inode *ip1, *ip2; + struct xfs_exchmaps_intent *xmi; + int error; + + /* + * Grab both inodes and set IRECOVERY to prevent trimming of post-eof + * mappings and freeing of unlinked inodes until we're totally done + * processing files. The ondisk format of this new log item contains + * file handle information, which is why recovery for other items do + * not check the inode generation number. + */ + error = xlog_recover_iget_handle(mp, xlf->xmi_inode1, xlf->xmi_igen1, + &ip1); + if (error) { + XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, xlf, + sizeof(*xlf)); + return ERR_PTR(error); + } + + error = xlog_recover_iget_handle(mp, xlf->xmi_inode2, xlf->xmi_igen2, + &ip2); + if (error) { + XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, xlf, + sizeof(*xlf)); + goto err_rele1; + } + + req->ip1 = ip1; + req->ip2 = ip2; + req->startoff1 = xlf->xmi_startoff1; + req->startoff2 = xlf->xmi_startoff2; + req->blockcount = xlf->xmi_blockcount; + req->flags = xlf->xmi_flags & XFS_EXCHMAPS_PARAMS; + + xfs_exchrange_ilock(NULL, ip1, ip2); + error = xfs_exchmaps_estimate(req); + xfs_exchrange_iunlock(ip1, ip2); + if (error) + goto err_rele2; + + *ipp1 = ip1; + *ipp2 = ip2; + xmi = xfs_exchmaps_init_intent(req); + xfs_defer_add_item(dfp, &xmi->xmi_list); + return xmi; + +err_rele2: + xfs_irele(ip2); +err_rele1: + xfs_irele(ip1); + req->ip2 = req->ip1 = NULL; + return ERR_PTR(error); +} + +/* Process a file mapping exchange item that was recovered from the log. */ +STATIC int +xfs_exchmaps_recover_work( + struct xfs_defer_pending *dfp, + struct list_head *capture_list) +{ + struct xfs_exchmaps_req req = { .flags = 0 }; + struct xfs_trans_res resv; + struct xfs_exchmaps_intent *xmi; + struct xfs_log_item *lip = dfp->dfp_intent; + struct xfs_xmi_log_item *xmi_lip = XMI_ITEM(lip); + struct xfs_mount *mp = lip->li_log->l_mp; + struct xfs_trans *tp; + struct xfs_inode *ip1, *ip2; + int error = 0; + + if (!xfs_xmi_validate(mp, xmi_lip)) { + XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, + &xmi_lip->xmi_format, + sizeof(xmi_lip->xmi_format)); + return -EFSCORRUPTED; + } + + xmi = xfs_xmi_item_recover_intent(mp, dfp, &xmi_lip->xmi_format, &req, + &ip1, &ip2); + if (IS_ERR(xmi)) + return PTR_ERR(xmi); + + trace_xfs_exchmaps_recover(mp, xmi); + + resv = xlog_recover_resv(&M_RES(mp)->tr_write); + error = xfs_trans_alloc(mp, &resv, req.resblks, 0, 0, &tp); + if (error) + goto err_rele; + + xfs_exchrange_ilock(tp, ip1, ip2); + + xfs_exchmaps_ensure_reflink(tp, xmi); + xfs_exchmaps_upgrade_extent_counts(tp, xmi); + error = xlog_recover_finish_intent(tp, dfp); + if (error == -EFSCORRUPTED) + XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, + &xmi_lip->xmi_format, + sizeof(xmi_lip->xmi_format)); + if (error) + goto err_cancel; + + /* + * Commit transaction, which frees the transaction and saves the inodes + * for later replay activities. + */ + error = xfs_defer_ops_capture_and_commit(tp, capture_list); + goto err_unlock; + +err_cancel: + xfs_trans_cancel(tp); +err_unlock: + xfs_exchrange_iunlock(ip1, ip2); +err_rele: + xfs_irele(ip2); + xfs_irele(ip1); + return error; +} + +/* Relog an intent item to push the log tail forward. */ +static struct xfs_log_item * +xfs_exchmaps_relog_intent( + struct xfs_trans *tp, + struct xfs_log_item *intent, + struct xfs_log_item *done_item) +{ + struct xfs_xmi_log_item *xmi_lip; + struct xfs_xmi_log_format *old_xlf, *new_xlf; + + old_xlf = &XMI_ITEM(intent)->xmi_format; + + xmi_lip = xfs_xmi_init(tp->t_mountp); + new_xlf = &xmi_lip->xmi_format; + + new_xlf->xmi_inode1 = old_xlf->xmi_inode1; + new_xlf->xmi_inode2 = old_xlf->xmi_inode2; + new_xlf->xmi_igen1 = old_xlf->xmi_igen1; + new_xlf->xmi_igen2 = old_xlf->xmi_igen2; + new_xlf->xmi_startoff1 = old_xlf->xmi_startoff1; + new_xlf->xmi_startoff2 = old_xlf->xmi_startoff2; + new_xlf->xmi_blockcount = old_xlf->xmi_blockcount; + new_xlf->xmi_flags = old_xlf->xmi_flags; + new_xlf->xmi_isize1 = old_xlf->xmi_isize1; + new_xlf->xmi_isize2 = old_xlf->xmi_isize2; + + return &xmi_lip->xmi_item; +} + +const struct xfs_defer_op_type xfs_exchmaps_defer_type = { + .name = "exchmaps", + .max_items = 1, + .create_intent = xfs_exchmaps_create_intent, + .abort_intent = xfs_exchmaps_abort_intent, + .create_done = xfs_exchmaps_create_done, + .finish_item = xfs_exchmaps_finish_item, + .cancel_item = xfs_exchmaps_cancel_item, + .recover_work = xfs_exchmaps_recover_work, + .relog_intent = xfs_exchmaps_relog_intent, +}; + +STATIC bool +xfs_xmi_item_match( + struct xfs_log_item *lip, + uint64_t intent_id) +{ + return XMI_ITEM(lip)->xmi_format.xmi_id == intent_id; +} + +static const struct xfs_item_ops xfs_xmi_item_ops = { + .flags = XFS_ITEM_INTENT, + .iop_size = xfs_xmi_item_size, + .iop_format = xfs_xmi_item_format, + .iop_unpin = xfs_xmi_item_unpin, + .iop_release = xfs_xmi_item_release, + .iop_match = xfs_xmi_item_match, +}; + +/* + * This routine is called to create an in-core file mapping exchange item from + * the xmi format structure which was logged on disk. It allocates an in-core + * xmi, copies the exchange information from the format structure into it, and + * adds the xmi to the AIL with the given LSN. + */ +STATIC int +xlog_recover_xmi_commit_pass2( + struct xlog *log, + struct list_head *buffer_list, + struct xlog_recover_item *item, + xfs_lsn_t lsn) +{ + struct xfs_mount *mp = log->l_mp; + struct xfs_xmi_log_item *xmi_lip; + struct xfs_xmi_log_format *xmi_formatp; + size_t len; + + len = sizeof(struct xfs_xmi_log_format); + if (item->ri_buf[0].i_len != len) { + XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, log->l_mp); + return -EFSCORRUPTED; + } + + xmi_formatp = item->ri_buf[0].i_addr; + if (xmi_formatp->__pad != 0) { + XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, log->l_mp); + return -EFSCORRUPTED; + } + + xmi_lip = xfs_xmi_init(mp); + memcpy(&xmi_lip->xmi_format, xmi_formatp, len); + + xlog_recover_intent_item(log, &xmi_lip->xmi_item, lsn, + &xfs_exchmaps_defer_type); + return 0; +} + +const struct xlog_recover_item_ops xlog_xmi_item_ops = { + .item_type = XFS_LI_XMI, + .commit_pass2 = xlog_recover_xmi_commit_pass2, +}; + +/* + * This routine is called when an XMD format structure is found in a committed + * transaction in the log. Its purpose is to cancel the corresponding XMI if it + * was still in the log. To do this it searches the AIL for the XMI with an id + * equal to that in the XMD format structure. If we find it we drop the XMD + * reference, which removes the XMI from the AIL and frees it. + */ +STATIC int +xlog_recover_xmd_commit_pass2( + struct xlog *log, + struct list_head *buffer_list, + struct xlog_recover_item *item, + xfs_lsn_t lsn) +{ + struct xfs_xmd_log_format *xmd_formatp; + + xmd_formatp = item->ri_buf[0].i_addr; + if (item->ri_buf[0].i_len != sizeof(struct xfs_xmd_log_format)) { + XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, log->l_mp); + return -EFSCORRUPTED; + } + + xlog_recover_release_intent(log, XFS_LI_XMI, xmd_formatp->xmd_xmi_id); + return 0; +} + +const struct xlog_recover_item_ops xlog_xmd_item_ops = { + .item_type = XFS_LI_XMD, + .commit_pass2 = xlog_recover_xmd_commit_pass2, +}; |