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virtiofs: introduce setupmapping/removemapping commands

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Introduce two new fuse commands to setup/remove memory mappings. This
will be used to setup/tear down file mapping in dax window.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Peng Tao <tao.peng@linux.alibaba.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Vivek Goyal 2020-08-19 18:19:50 -04:00 committed by Miklos Szeredi
parent fd1a1dc6f5
commit ceec02d435
1 changed files with 29 additions and 0 deletions
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29
include/uapi/linux/fuse.h
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@ -894,4 +894,33 @@ struct fuse_copy_file_range_in {
uint64_t flags;
};
#define FUSE_SETUPMAPPING_FLAG_WRITE (1ull << 0)
struct fuse_setupmapping_in {
/* An already open handle */
uint64_t fh;
/* Offset into the file to start the mapping */
uint64_t foffset;
/* Length of mapping required */
uint64_t len;
/* Flags, FUSE_SETUPMAPPING_FLAG_* */
uint64_t flags;
/* Offset in Memory Window */
uint64_t moffset;
};
struct fuse_removemapping_in {
/* number of fuse_removemapping_one follows */
uint32_t count;
};
struct fuse_removemapping_one {
/* Offset into the dax window start the unmapping */
uint64_t moffset;
/* Length of mapping required */
uint64_t len;
};
#define FUSE_REMOVEMAPPING_MAX_ENTRY \
(PAGE_SIZE / sizeof(struct fuse_removemapping_one))
#endif /* _LINUX_FUSE_H */