On Jul 30, 2014, at 11:18 AM, David Sterba <dsterba@xxxxxxx> wrote:
> Add extent flag to indicate that the data are compressed. The users
> set the fe_phys_length member, and PHYS_LENGTH and ENCODED flags.
>
> Signed-off-by: David Sterba <dsterba@xxxxxxx>
> ---
> fs/ioctl.c | 6 +++++-
> include/uapi/linux/fiemap.h | 4 ++++
> 2 files changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/fs/ioctl.c b/fs/ioctl.c
> index 127551c70b0a..902b1d5a6316 100644
> --- a/fs/ioctl.c
> +++ b/fs/ioctl.c
> @@ -81,7 +81,8 @@ static int ioctl_fibmap(struct file *filp, int __user *p)
> * extent that will fit in user array.
> */
> #define SET_UNKNOWN_FLAGS (FIEMAP_EXTENT_DELALLOC)
> -#define SET_NO_UNMOUNTED_IO_FLAGS (FIEMAP_EXTENT_DATA_ENCRYPTED)
> +#define SET_NO_UNMOUNTED_IO_FLAGS (FIEMAP_EXTENT_DATA_ENCRYPTED | \
> + FIEMAP_EXTENT_DATA_COMPRESSED)
> #define SET_NOT_ALIGNED_FLAGS (FIEMAP_EXTENT_DATA_TAIL|FIEMAP_EXTENT_DATA_INLINE)
> int fiemap_fill_next_extent(struct fiemap_extent_info *fieinfo, u64 logical,
> u64 phys, u64 len, u64 phys_len, u32 flags)
> @@ -112,6 +113,9 @@ int fiemap_fill_next_extent(struct fiemap_extent_info *fieinfo, u64 logical,
> extent.fe_flags = flags;
> extent.fe_phys_length = phys_len;
>
> + WARN_ON_ONCE((flags & FIEMAP_EXTENT_DATA_COMPRESSED)
> + && !(flags & FIEMAP_EXTENT_ENCODED));
> +
> dest += fieinfo->fi_extents_mapped;
> if (copy_to_user(dest, &extent, sizeof(extent)))
> return -EFAULT;
> diff --git a/include/uapi/linux/fiemap.h b/include/uapi/linux/fiemap.h
> index ed52d3f7821d..64fb1b3a7e1f 100644
> --- a/include/uapi/linux/fiemap.h
> +++ b/include/uapi/linux/fiemap.h
> @@ -54,6 +54,10 @@ struct fiemap {
> * while fs is unmounted */
> #define FIEMAP_EXTENT_PHYS_LENGTH 0x00000010 /* Physical length of extent
> * not the same as logical */
> +#define FIEMAP_EXTENT_DATA_COMPRESSED 0x00000040 /* Data is compressed by fs.
> + * Sets EXTENT_ENCODED and
> + * the compressed size is
> + * stored in fe_phys_length */
This should also set PHYS_LENGTH.
> #define FIEMAP_EXTENT_DATA_ENCRYPTED 0x00000080 /* Data is encrypted by fs.
> * Sets EXTENT_ENCODED */
> #define FIEMAP_EXTENT_NOT_ALIGNED 0x00000100 /* Extent offsets may not be
> --
> 1.8.4.5
>
Cheers, Andreas
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