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-rw-r--r--fs/xfs/libxfs/xfs_bmap.h270
1 files changed, 270 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_bmap.h b/fs/xfs/libxfs/xfs_bmap.h
new file mode 100644
index 000000000..16db95b11
--- /dev/null
+++ b/fs/xfs/libxfs/xfs_bmap.h
@@ -0,0 +1,270 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2000-2006 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ */
+#ifndef __XFS_BMAP_H__
+#define __XFS_BMAP_H__
+
+struct getbmap;
+struct xfs_bmbt_irec;
+struct xfs_ifork;
+struct xfs_inode;
+struct xfs_mount;
+struct xfs_trans;
+
+/*
+ * Argument structure for xfs_bmap_alloc.
+ */
+struct xfs_bmalloca {
+ struct xfs_trans *tp; /* transaction pointer */
+ struct xfs_inode *ip; /* incore inode pointer */
+ struct xfs_bmbt_irec prev; /* extent before the new one */
+ struct xfs_bmbt_irec got; /* extent after, or delayed */
+
+ xfs_fileoff_t offset; /* offset in file filling in */
+ xfs_extlen_t length; /* i/o length asked/allocated */
+ xfs_fsblock_t blkno; /* starting block of new extent */
+
+ struct xfs_btree_cur *cur; /* btree cursor */
+ struct xfs_iext_cursor icur; /* incore extent cursor */
+ int nallocs;/* number of extents alloc'd */
+ int logflags;/* flags for transaction logging */
+
+ xfs_extlen_t total; /* total blocks needed for xaction */
+ xfs_extlen_t minlen; /* minimum allocation size (blocks) */
+ xfs_extlen_t minleft; /* amount must be left after alloc */
+ bool eof; /* set if allocating past last extent */
+ bool wasdel; /* replacing a delayed allocation */
+ bool aeof; /* allocated space at eof */
+ bool conv; /* overwriting unwritten extents */
+ int datatype;/* data type being allocated */
+ uint32_t flags;
+};
+
+#define XFS_BMAP_MAX_NMAP 4
+
+/*
+ * Flags for xfs_bmapi_*
+ */
+#define XFS_BMAPI_ENTIRE (1u << 0) /* return entire extent untrimmed */
+#define XFS_BMAPI_METADATA (1u << 1) /* mapping metadata not user data */
+#define XFS_BMAPI_ATTRFORK (1u << 2) /* use attribute fork not data */
+#define XFS_BMAPI_PREALLOC (1u << 3) /* preallocating unwritten space */
+#define XFS_BMAPI_CONTIG (1u << 4) /* must allocate only one extent */
+/*
+ * unwritten extent conversion - this needs write cache flushing and no additional
+ * allocation alignments. When specified with XFS_BMAPI_PREALLOC it converts
+ * from written to unwritten, otherwise convert from unwritten to written.
+ */
+#define XFS_BMAPI_CONVERT (1u << 5)
+
+/*
+ * allocate zeroed extents - this requires all newly allocated user data extents
+ * to be initialised to zero. It will be ignored if XFS_BMAPI_METADATA is set.
+ * Use in conjunction with XFS_BMAPI_CONVERT to convert unwritten extents found
+ * during the allocation range to zeroed written extents.
+ */
+#define XFS_BMAPI_ZERO (1u << 6)
+
+/*
+ * Map the inode offset to the block given in ap->firstblock. Primarily
+ * used for reflink. The range must be in a hole, and this flag cannot be
+ * turned on with PREALLOC or CONVERT, and cannot be used on the attr fork.
+ *
+ * For bunmapi, this flag unmaps the range without adjusting quota, reducing
+ * refcount, or freeing the blocks.
+ */
+#define XFS_BMAPI_REMAP (1u << 7)
+
+/* Map something in the CoW fork. */
+#define XFS_BMAPI_COWFORK (1u << 8)
+
+/* Skip online discard of freed extents */
+#define XFS_BMAPI_NODISCARD (1u << 9)
+
+/* Do not update the rmap btree. Used for reconstructing bmbt from rmapbt. */
+#define XFS_BMAPI_NORMAP (1u << 10)
+
+#define XFS_BMAPI_FLAGS \
+ { XFS_BMAPI_ENTIRE, "ENTIRE" }, \
+ { XFS_BMAPI_METADATA, "METADATA" }, \
+ { XFS_BMAPI_ATTRFORK, "ATTRFORK" }, \
+ { XFS_BMAPI_PREALLOC, "PREALLOC" }, \
+ { XFS_BMAPI_CONTIG, "CONTIG" }, \
+ { XFS_BMAPI_CONVERT, "CONVERT" }, \
+ { XFS_BMAPI_ZERO, "ZERO" }, \
+ { XFS_BMAPI_REMAP, "REMAP" }, \
+ { XFS_BMAPI_COWFORK, "COWFORK" }, \
+ { XFS_BMAPI_NODISCARD, "NODISCARD" }, \
+ { XFS_BMAPI_NORMAP, "NORMAP" }
+
+
+static inline int xfs_bmapi_aflag(int w)
+{
+ return (w == XFS_ATTR_FORK ? XFS_BMAPI_ATTRFORK :
+ (w == XFS_COW_FORK ? XFS_BMAPI_COWFORK : 0));
+}
+
+static inline int xfs_bmapi_whichfork(uint32_t bmapi_flags)
+{
+ if (bmapi_flags & XFS_BMAPI_COWFORK)
+ return XFS_COW_FORK;
+ else if (bmapi_flags & XFS_BMAPI_ATTRFORK)
+ return XFS_ATTR_FORK;
+ return XFS_DATA_FORK;
+}
+
+/*
+ * Special values for xfs_bmbt_irec_t br_startblock field.
+ */
+#define DELAYSTARTBLOCK ((xfs_fsblock_t)-1LL)
+#define HOLESTARTBLOCK ((xfs_fsblock_t)-2LL)
+
+/*
+ * Flags for xfs_bmap_add_extent*.
+ */
+#define BMAP_LEFT_CONTIG (1u << 0)
+#define BMAP_RIGHT_CONTIG (1u << 1)
+#define BMAP_LEFT_FILLING (1u << 2)
+#define BMAP_RIGHT_FILLING (1u << 3)
+#define BMAP_LEFT_DELAY (1u << 4)
+#define BMAP_RIGHT_DELAY (1u << 5)
+#define BMAP_LEFT_VALID (1u << 6)
+#define BMAP_RIGHT_VALID (1u << 7)
+#define BMAP_ATTRFORK (1u << 8)
+#define BMAP_COWFORK (1u << 9)
+
+#define XFS_BMAP_EXT_FLAGS \
+ { BMAP_LEFT_CONTIG, "LC" }, \
+ { BMAP_RIGHT_CONTIG, "RC" }, \
+ { BMAP_LEFT_FILLING, "LF" }, \
+ { BMAP_RIGHT_FILLING, "RF" }, \
+ { BMAP_ATTRFORK, "ATTR" }, \
+ { BMAP_COWFORK, "COW" }
+
+/* Return true if the extent is an allocated extent, written or not. */
+static inline bool xfs_bmap_is_real_extent(struct xfs_bmbt_irec *irec)
+{
+ return irec->br_startblock != HOLESTARTBLOCK &&
+ irec->br_startblock != DELAYSTARTBLOCK &&
+ !isnullstartblock(irec->br_startblock);
+}
+
+/*
+ * Return true if the extent is a real, allocated extent, or false if it is a
+ * delayed allocation, and unwritten extent or a hole.
+ */
+static inline bool xfs_bmap_is_written_extent(struct xfs_bmbt_irec *irec)
+{
+ return xfs_bmap_is_real_extent(irec) &&
+ irec->br_state != XFS_EXT_UNWRITTEN;
+}
+
+/*
+ * Check the mapping for obviously garbage allocations that could trash the
+ * filesystem immediately.
+ */
+#define xfs_valid_startblock(ip, startblock) \
+ ((startblock) != 0 || XFS_IS_REALTIME_INODE(ip))
+
+void xfs_trim_extent(struct xfs_bmbt_irec *irec, xfs_fileoff_t bno,
+ xfs_filblks_t len);
+unsigned int xfs_bmap_compute_attr_offset(struct xfs_mount *mp);
+int xfs_bmap_add_attrfork(struct xfs_inode *ip, int size, int rsvd);
+void xfs_bmap_local_to_extents_empty(struct xfs_trans *tp,
+ struct xfs_inode *ip, int whichfork);
+void xfs_bmap_compute_maxlevels(struct xfs_mount *mp, int whichfork);
+int xfs_bmap_first_unused(struct xfs_trans *tp, struct xfs_inode *ip,
+ xfs_extlen_t len, xfs_fileoff_t *unused, int whichfork);
+int xfs_bmap_last_before(struct xfs_trans *tp, struct xfs_inode *ip,
+ xfs_fileoff_t *last_block, int whichfork);
+int xfs_bmap_last_offset(struct xfs_inode *ip, xfs_fileoff_t *unused,
+ int whichfork);
+int xfs_bmapi_read(struct xfs_inode *ip, xfs_fileoff_t bno,
+ xfs_filblks_t len, struct xfs_bmbt_irec *mval,
+ int *nmap, uint32_t flags);
+int xfs_bmapi_write(struct xfs_trans *tp, struct xfs_inode *ip,
+ xfs_fileoff_t bno, xfs_filblks_t len, uint32_t flags,
+ xfs_extlen_t total, struct xfs_bmbt_irec *mval, int *nmap);
+int __xfs_bunmapi(struct xfs_trans *tp, struct xfs_inode *ip,
+ xfs_fileoff_t bno, xfs_filblks_t *rlen, uint32_t flags,
+ xfs_extnum_t nexts);
+int xfs_bunmapi(struct xfs_trans *tp, struct xfs_inode *ip,
+ xfs_fileoff_t bno, xfs_filblks_t len, uint32_t flags,
+ xfs_extnum_t nexts, int *done);
+int xfs_bmap_del_extent_delay(struct xfs_inode *ip, int whichfork,
+ struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *got,
+ struct xfs_bmbt_irec *del);
+void xfs_bmap_del_extent_cow(struct xfs_inode *ip,
+ struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *got,
+ struct xfs_bmbt_irec *del);
+uint xfs_default_attroffset(struct xfs_inode *ip);
+int xfs_bmap_collapse_extents(struct xfs_trans *tp, struct xfs_inode *ip,
+ xfs_fileoff_t *next_fsb, xfs_fileoff_t offset_shift_fsb,
+ bool *done);
+int xfs_bmap_can_insert_extents(struct xfs_inode *ip, xfs_fileoff_t off,
+ xfs_fileoff_t shift);
+int xfs_bmap_insert_extents(struct xfs_trans *tp, struct xfs_inode *ip,
+ xfs_fileoff_t *next_fsb, xfs_fileoff_t offset_shift_fsb,
+ bool *done, xfs_fileoff_t stop_fsb);
+int xfs_bmap_split_extent(struct xfs_trans *tp, struct xfs_inode *ip,
+ xfs_fileoff_t split_offset);
+int xfs_bmapi_reserve_delalloc(struct xfs_inode *ip, int whichfork,
+ xfs_fileoff_t off, xfs_filblks_t len, xfs_filblks_t prealloc,
+ struct xfs_bmbt_irec *got, struct xfs_iext_cursor *cur,
+ int eof);
+int xfs_bmapi_convert_delalloc(struct xfs_inode *ip, int whichfork,
+ xfs_off_t offset, struct iomap *iomap, unsigned int *seq);
+int xfs_bmap_add_extent_unwritten_real(struct xfs_trans *tp,
+ struct xfs_inode *ip, int whichfork,
+ struct xfs_iext_cursor *icur, struct xfs_btree_cur **curp,
+ struct xfs_bmbt_irec *new, int *logflagsp);
+
+enum xfs_bmap_intent_type {
+ XFS_BMAP_MAP = 1,
+ XFS_BMAP_UNMAP,
+};
+
+struct xfs_bmap_intent {
+ struct list_head bi_list;
+ enum xfs_bmap_intent_type bi_type;
+ int bi_whichfork;
+ struct xfs_inode *bi_owner;
+ struct xfs_bmbt_irec bi_bmap;
+};
+
+int xfs_bmap_finish_one(struct xfs_trans *tp, struct xfs_inode *ip,
+ enum xfs_bmap_intent_type type, int whichfork,
+ xfs_fileoff_t startoff, xfs_fsblock_t startblock,
+ xfs_filblks_t *blockcount, xfs_exntst_t state);
+void xfs_bmap_map_extent(struct xfs_trans *tp, struct xfs_inode *ip,
+ struct xfs_bmbt_irec *imap);
+void xfs_bmap_unmap_extent(struct xfs_trans *tp, struct xfs_inode *ip,
+ struct xfs_bmbt_irec *imap);
+
+static inline uint32_t xfs_bmap_fork_to_state(int whichfork)
+{
+ switch (whichfork) {
+ case XFS_ATTR_FORK:
+ return BMAP_ATTRFORK;
+ case XFS_COW_FORK:
+ return BMAP_COWFORK;
+ default:
+ return 0;
+ }
+}
+
+xfs_failaddr_t xfs_bmap_validate_extent(struct xfs_inode *ip, int whichfork,
+ struct xfs_bmbt_irec *irec);
+
+int xfs_bmapi_remap(struct xfs_trans *tp, struct xfs_inode *ip,
+ xfs_fileoff_t bno, xfs_filblks_t len, xfs_fsblock_t startblock,
+ uint32_t flags);
+
+extern struct kmem_cache *xfs_bmap_intent_cache;
+
+int __init xfs_bmap_intent_init_cache(void);
+void xfs_bmap_intent_destroy_cache(void);
+
+#endif /* __XFS_BMAP_H__ */