On Wed, 2010-06-30 at 02:17 +0100, David Howells wrote:
> Add a pair of system calls to make extended file stats available, including
> file creation time, inode version and data version where available through the
> underlying filesystem:
>
> struct xstat_dev {
> unsigned int major;
> unsigned int minor;
> };
>
> struct xstat_time {
> unsigned long long tv_sec;
> unsigned long long tv_nsec;
> };
>
> struct xstat {
> unsigned int struct_version;
> #define XSTAT_STRUCT_VERSION 0
> unsigned int st_mode;
> unsigned int st_nlink;
> unsigned int st_uid;
> unsigned int st_gid;
> unsigned int st_blksize;
> struct xstat_dev st_rdev;
> struct xstat_dev st_dev;
> unsigned long long st_ino;
> unsigned long long st_size;
> struct xstat_time st_atime;
> struct xstat_time st_mtime;
> struct xstat_time st_ctime;
> struct xstat_time st_btime;
> unsigned long long st_blocks;
> unsigned long long st_gen;
> unsigned long long st_data_version;
> unsigned long long query_flags;
> #define XSTAT_QUERY_SIZE 0x00000001ULL
> #define XSTAT_QUERY_NLINK 0x00000002ULL
> #define XSTAT_QUERY_AMC_TIMES 0x00000004ULL
> #define XSTAT_QUERY_CREATION_TIME 0x00000008ULL
> #define XSTAT_QUERY_BLOCKS 0x00000010ULL
> #define XSTAT_QUERY_INODE_GENERATION 0x00000020ULL
> #define XSTAT_QUERY_DATA_VERSION 0x00000040ULL
> unsigned long long extra_results[0];
> };
>
unsigned long long inside a struct has 4 byte alignment on x86, while
AMD64 has 8 byte alignment. This struct layout isn't affected by the
difference, but that's something to keep in mind.
--
Nicholas Miell <nmiell@xxxxxxxxxxx>
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