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-rw-r--r--fs/xfs/libxfs/xfs_exchmaps.h124
1 files changed, 124 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_exchmaps.h b/fs/xfs/libxfs/xfs_exchmaps.h
new file mode 100644
index 0000000000..fa822dff20
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+++ b/fs/xfs/libxfs/xfs_exchmaps.h
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+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (c) 2020-2024 Oracle. All Rights Reserved.
+ * Author: Darrick J. Wong <djwong@kernel.org>
+ */
+#ifndef __XFS_EXCHMAPS_H__
+#define __XFS_EXCHMAPS_H__
+
+/* In-core deferred operation info about a file mapping exchange request. */
+struct xfs_exchmaps_intent {
+ /* List of other incore deferred work. */
+ struct list_head xmi_list;
+
+ /* Inodes participating in the operation. */
+ struct xfs_inode *xmi_ip1;
+ struct xfs_inode *xmi_ip2;
+
+ /* File offset range information. */
+ xfs_fileoff_t xmi_startoff1;
+ xfs_fileoff_t xmi_startoff2;
+ xfs_filblks_t xmi_blockcount;
+
+ /* Set these file sizes after the operation, unless negative. */
+ xfs_fsize_t xmi_isize1;
+ xfs_fsize_t xmi_isize2;
+
+ uint64_t xmi_flags; /* XFS_EXCHMAPS_* flags */
+};
+
+/* Try to convert inode2 from block to short format at the end, if possible. */
+#define __XFS_EXCHMAPS_INO2_SHORTFORM (1ULL << 63)
+
+#define XFS_EXCHMAPS_INTERNAL_FLAGS (__XFS_EXCHMAPS_INO2_SHORTFORM)
+
+/* flags that can be passed to xfs_exchmaps_{estimate,mappings} */
+#define XFS_EXCHMAPS_PARAMS (XFS_EXCHMAPS_ATTR_FORK | \
+ XFS_EXCHMAPS_SET_SIZES | \
+ XFS_EXCHMAPS_INO1_WRITTEN)
+
+static inline int
+xfs_exchmaps_whichfork(const struct xfs_exchmaps_intent *xmi)
+{
+ if (xmi->xmi_flags & XFS_EXCHMAPS_ATTR_FORK)
+ return XFS_ATTR_FORK;
+ return XFS_DATA_FORK;
+}
+
+/* Parameters for a mapping exchange request. */
+struct xfs_exchmaps_req {
+ /* Inodes participating in the operation. */
+ struct xfs_inode *ip1;
+ struct xfs_inode *ip2;
+
+ /* File offset range information. */
+ xfs_fileoff_t startoff1;
+ xfs_fileoff_t startoff2;
+ xfs_filblks_t blockcount;
+
+ /* XFS_EXCHMAPS_* operation flags */
+ uint64_t flags;
+
+ /*
+ * Fields below this line are filled out by xfs_exchmaps_estimate;
+ * callers should initialize this part of the struct to zero.
+ */
+
+ /*
+ * Data device blocks to be moved out of ip1, and free space needed to
+ * handle the bmbt changes.
+ */
+ xfs_filblks_t ip1_bcount;
+
+ /*
+ * Data device blocks to be moved out of ip2, and free space needed to
+ * handle the bmbt changes.
+ */
+ xfs_filblks_t ip2_bcount;
+
+ /* rt blocks to be moved out of ip1. */
+ xfs_filblks_t ip1_rtbcount;
+
+ /* rt blocks to be moved out of ip2. */
+ xfs_filblks_t ip2_rtbcount;
+
+ /* Free space needed to handle the bmbt changes */
+ unsigned long long resblks;
+
+ /* Number of exchanges needed to complete the operation */
+ unsigned long long nr_exchanges;
+};
+
+static inline int
+xfs_exchmaps_reqfork(const struct xfs_exchmaps_req *req)
+{
+ if (req->flags & XFS_EXCHMAPS_ATTR_FORK)
+ return XFS_ATTR_FORK;
+ return XFS_DATA_FORK;
+}
+
+int xfs_exchmaps_estimate_overhead(struct xfs_exchmaps_req *req);
+int xfs_exchmaps_estimate(struct xfs_exchmaps_req *req);
+
+extern struct kmem_cache *xfs_exchmaps_intent_cache;
+
+int __init xfs_exchmaps_intent_init_cache(void);
+void xfs_exchmaps_intent_destroy_cache(void);
+
+struct xfs_exchmaps_intent *xfs_exchmaps_init_intent(
+ const struct xfs_exchmaps_req *req);
+void xfs_exchmaps_ensure_reflink(struct xfs_trans *tp,
+ const struct xfs_exchmaps_intent *xmi);
+void xfs_exchmaps_upgrade_extent_counts(struct xfs_trans *tp,
+ const struct xfs_exchmaps_intent *xmi);
+
+int xfs_exchmaps_finish_one(struct xfs_trans *tp,
+ struct xfs_exchmaps_intent *xmi);
+
+int xfs_exchmaps_check_forks(struct xfs_mount *mp,
+ const struct xfs_exchmaps_req *req);
+
+void xfs_exchange_mappings(struct xfs_trans *tp,
+ const struct xfs_exchmaps_req *req);
+
+#endif /* __XFS_EXCHMAPS_H__ */