xfs: map an inode's offset to an exact physical block (f65306ea) · Commits · e / devices / android_kernel_fairphone_FP4

fs/xfs/libxfs/xfs_bmap.c

+68 −0

Original line number	Diff line number	Diff line
		@@ -3876,6 +3876,63 @@ xfs_bmap_btalloc(
		return 0;
		}

		/*
		* For a remap operation, just "allocate" an extent at the address that the
		* caller passed in, and ensure that the AGFL is the right size. The caller
		* will then map the "allocated" extent into the file somewhere.
		*/
		STATIC int
		xfs_bmap_remap_alloc(
		struct xfs_bmalloca *ap)
		{
		struct xfs_trans *tp = ap->tp;
		struct xfs_mount *mp = tp->t_mountp;
		xfs_agblock_t bno;
		struct xfs_alloc_arg args;
		int error;

		/*
		* validate that the block number is legal - the enables us to detect
		* and handle a silent filesystem corruption rather than crashing.
		*/
		memset(&args, 0, sizeof(struct xfs_alloc_arg));
		args.tp = ap->tp;
		args.mp = ap->tp->t_mountp;
		bno = *ap->firstblock;
		args.agno = XFS_FSB_TO_AGNO(mp, bno);
		args.agbno = XFS_FSB_TO_AGBNO(mp, bno);
		if (args.agno >= mp->m_sb.sb_agcount \|\|
		args.agbno >= mp->m_sb.sb_agblocks)
		return -EFSCORRUPTED;

		/* "Allocate" the extent from the range we passed in. */
		trace_xfs_bmap_remap_alloc(ap->ip, *ap->firstblock, ap->length);
		ap->blkno = bno;
		ap->ip->i_d.di_nblocks += ap->length;
		xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);

		/* Fix the freelist, like a real allocator does. */
		args.datatype = ap->datatype;
		args.pag = xfs_perag_get(args.mp, args.agno);
		ASSERT(args.pag);

		/*
		* The freelist fixing code will decline the allocation if
		* the size and shape of the free space doesn't allow for
		* allocating the extent and updating all the metadata that
		* happens during an allocation. We're remapping, not
		* allocating, so skip that check by pretending to be freeing.
		*/
		error = xfs_alloc_fix_freelist(&args, XFS_ALLOC_FLAG_FREEING);
		if (error)
		goto error0;
		error0:
		xfs_perag_put(args.pag);
		if (error)
		trace_xfs_bmap_remap_alloc_error(ap->ip, error, _RET_IP_);
		return error;
		}

		/*
		* xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
		* It figures out where to ask the underlying allocator to put the new extent.
		@@ -3884,6 +3941,8 @@ STATIC int
		xfs_bmap_alloc(
		struct xfs_bmalloca ap) / bmap alloc argument struct */
		{
		if (ap->flags & XFS_BMAPI_REMAP)
		return xfs_bmap_remap_alloc(ap);
		if (XFS_IS_REALTIME_INODE(ap->ip) &&
		xfs_alloc_is_userdata(ap->datatype))
		return xfs_bmap_rtalloc(ap);
		@@ -4442,6 +4501,9 @@ xfs_bmapi_write(
		ASSERT(len > 0);
		ASSERT(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL);
		ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
		ASSERT(!(flags & XFS_BMAPI_REMAP) \|\| whichfork == XFS_DATA_FORK);
		ASSERT(!(flags & XFS_BMAPI_PREALLOC) \|\| !(flags & XFS_BMAPI_REMAP));
		ASSERT(!(flags & XFS_BMAPI_CONVERT) \|\| !(flags & XFS_BMAPI_REMAP));

		/* zeroing is for currently only for data extents, not metadata */
		ASSERT((flags & (XFS_BMAPI_METADATA \| XFS_BMAPI_ZERO)) !=
		@@ -4502,6 +4564,12 @@ xfs_bmapi_write(
		inhole = eof \|\| bma.got.br_startoff > bno;
		wasdelay = !inhole && isnullstartblock(bma.got.br_startblock);

		/*
		* Make sure we only reflink into a hole.
		*/
		if (flags & XFS_BMAPI_REMAP)
		ASSERT(inhole);

		/*
		* First, deal with the hole before the allocated space
		* that we found, if any.

fs/xfs/libxfs/xfs_bmap.h

+9 −1

Original line number	Diff line number	Diff line
		@@ -97,6 +97,13 @@ struct xfs_extent_free_item
		*/
		#define XFS_BMAPI_ZERO 0x080

		/*
		* 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.
		*/
		#define XFS_BMAPI_REMAP 0x100

		#define XFS_BMAPI_FLAGS \
		{ XFS_BMAPI_ENTIRE, "ENTIRE" }, \
		{ XFS_BMAPI_METADATA, "METADATA" }, \
		@@ -105,7 +112,8 @@ struct xfs_extent_free_item
		{ XFS_BMAPI_IGSTATE, "IGSTATE" }, \
		{ XFS_BMAPI_CONTIG, "CONTIG" }, \
		{ XFS_BMAPI_CONVERT, "CONVERT" }, \
		{ XFS_BMAPI_ZERO, "ZERO" }
		{ XFS_BMAPI_ZERO, "ZERO" }, \
		{ XFS_BMAPI_REMAP, "REMAP" }


		static inline int xfs_bmapi_aflag(int w)

fs/xfs/xfs_trace.h

+54 −0

Original line number	Diff line number	Diff line
		@@ -2968,6 +2968,60 @@ TRACE_EVENT(xfs_refcount_finish_one_leftover,
		__entry->new_len)
		);

		/* simple inode-based error/%ip tracepoint class */
		DECLARE_EVENT_CLASS(xfs_inode_error_class,
		TP_PROTO(struct xfs_inode *ip, int error, unsigned long caller_ip),
		TP_ARGS(ip, error, caller_ip),
		TP_STRUCT__entry(
		__field(dev_t, dev)
		__field(xfs_ino_t, ino)
		__field(int, error)
		__field(unsigned long, caller_ip)
		),
		TP_fast_assign(
		__entry->dev = VFS_I(ip)->i_sb->s_dev;
		__entry->ino = ip->i_ino;
		__entry->error = error;
		__entry->caller_ip = caller_ip;
		),
		TP_printk("dev %d:%d ino %llx error %d caller %ps",
		MAJOR(__entry->dev), MINOR(__entry->dev),
		__entry->ino,
		__entry->error,
		(char *)__entry->caller_ip)
		);

		#define DEFINE_INODE_ERROR_EVENT(name) \
		DEFINE_EVENT(xfs_inode_error_class, name, \
		TP_PROTO(struct xfs_inode *ip, int error, \
		unsigned long caller_ip), \
		TP_ARGS(ip, error, caller_ip))

		/* reflink allocator */
		TRACE_EVENT(xfs_bmap_remap_alloc,
		TP_PROTO(struct xfs_inode *ip, xfs_fsblock_t fsbno,
		xfs_extlen_t len),
		TP_ARGS(ip, fsbno, len),
		TP_STRUCT__entry(
		__field(dev_t, dev)
		__field(xfs_ino_t, ino)
		__field(xfs_fsblock_t, fsbno)
		__field(xfs_extlen_t, len)
		),
		TP_fast_assign(
		__entry->dev = VFS_I(ip)->i_sb->s_dev;
		__entry->ino = ip->i_ino;
		__entry->fsbno = fsbno;
		__entry->len = len;
		),
		TP_printk("dev %d:%d ino 0x%llx fsbno 0x%llx len %x",
		MAJOR(__entry->dev), MINOR(__entry->dev),
		__entry->ino,
		__entry->fsbno,
		__entry->len)
		);
		DEFINE_INODE_ERROR_EVENT(xfs_bmap_remap_alloc_error);

		#endif /* _TRACE_XFS_H */

		#undef TRACE_INCLUDE_PATH