diff options
| author | Darrick J. Wong <djwong@kernel.org> | 2024-02-22 12:43:21 -0800 |
|---|---|---|
| committer | Darrick J. Wong <djwong@kernel.org> | 2024-02-22 12:43:21 -0800 |
| commit | 5076a6040ca1613e616d84aecfaac5f932db84e0 (patch) | |
| tree | 194bbc76321d6906f68b651b94ab1c4f48c44097 /fs/xfs/xfs_buf.h | |
| parent | e7b58f7c1be20550d4f51cec6307b811e7555f52 (diff) | |
xfs: support in-memory buffer cache targets
Allow the buffer cache to target in-memory files by making it possible
to have a buftarg that maps pages from private shmem files. As the
prevous patch alludes, the in-memory buftarg contains its own cache,
points to a shmem file, and does not point to a block_device.
The next few patches will make it possible to construct an xfs_btree in
pageable memory by using this buftarg.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'fs/xfs/xfs_buf.h')
| -rw-r--r-- | fs/xfs/xfs_buf.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/fs/xfs/xfs_buf.h b/fs/xfs/xfs_buf.h index 7b01df6dcd50..73249abca968 100644 --- a/fs/xfs/xfs_buf.h +++ b/fs/xfs/xfs_buf.h @@ -109,6 +109,7 @@ struct xfs_buftarg { struct bdev_handle *bt_bdev_handle; struct block_device *bt_bdev; struct dax_device *bt_daxdev; + struct file *bt_file; u64 bt_dax_part_off; struct xfs_mount *bt_mount; unsigned int bt_meta_sectorsize; @@ -122,6 +123,9 @@ struct xfs_buftarg { struct percpu_counter bt_io_count; struct ratelimit_state bt_ioerror_rl; + + /* built-in cache, if we're not using the perag one */ + struct xfs_buf_cache bt_cache[]; }; #define XB_PAGES 2 @@ -387,4 +391,9 @@ int xfs_buf_reverify(struct xfs_buf *bp, const struct xfs_buf_ops *ops); bool xfs_verify_magic(struct xfs_buf *bp, __be32 dmagic); bool xfs_verify_magic16(struct xfs_buf *bp, __be16 dmagic); +/* for xfs_buf_mem.c only: */ +int xfs_init_buftarg(struct xfs_buftarg *btp, size_t logical_sectorsize, + const char *descr); +void xfs_destroy_buftarg(struct xfs_buftarg *btp); + #endif /* __XFS_BUF_H__ */ |