search for: extent_same

...nclude <fcntl.h> +#include <unistd.h> +#include <stdio.h> +#include <stdlib.h> +#include <stdint.h> +#include <stddef.h> +#include <errno.h> +#include <string.h> +#include <sys/ioctl.h> + +#define BTRFS_IOCTL_MAGIC 0x94 + +#define BTRFS_IOC_FILE_EXTENT_SAME _IOWR(BTRFS_IOCTL_MAGIC, 54, \ + struct btrfs_ioctl_same_args) + +#define BTRFS_SAME_DATA_DIFFERS 1 +/* For extent-same ioctl */ +struct btrfs_ioctl_same_extent_info { + int64_t fd; /* in - destination file */ + uint64_t logical_offset; /* in - start of extent in destination */ + uint64_t by...

...this is to maintain - check that we don''t dedupe files with different checksumming states (compare BTRFS_INODE_NODATASUM flags) - get and maintain write access to the mount during the extent same operation (mount_want_write()) - allocate our read buffers up front in btrfs_ioctl_file_extent_same() and pass them through for re-use on every call to btrfs_extent_same(). (thanks to David Sterba <dsterba@suse.cz> for reporting this - As the read buffers could possibly be up to 1MB (depending on user request), we now conditionally vmalloc them. - removed redundant check for same in...