On 11/06/2010 09:58 PM, Marco Stornelli wrote:
> From: Marco Stornelli <marco.stornelli@xxxxxxxxx>
>
> Definitions for the PRAMFS filesystem.
>
> Signed-off-by: Marco Stornelli <marco.stornelli@xxxxxxxxx>
> ---
> diff -Nurp linux-2.6.36-orig/fs/pramfs/pram.h linux-2.6.36/fs/pramfs/pram.h
> --- linux-2.6.36-orig/fs/pramfs/pram.h 1970-01-01 01:00:00.000000000 +0100
> +++ linux-2.6.36/fs/pramfs/pram.h 2010-10-30 12:02:45.000000000 +0200
> @@ -0,0 +1,317 @@
> +/*
> + * Structure of the super block in PRAMFS
> + */
> +struct pram_super_block {
> + __be16 s_sum; /* checksum of this sb, including padding */
> + __be64 s_size; /* total size of fs in bytes */
> + __be32 s_blocksize; /* blocksize in bytes */
> + __be32 s_inodes_count; /* total inodes count (used or free) */
> + __be32 s_free_inodes_count;/* free inodes count */
> + __be32 s_free_inode_hint; /* start hint for locating free inodes */
> + __be32 s_blocks_count; /* total data blocks count (used or free) */
> + __be32 s_free_blocks_count;/* free data blocks count */
> + __be32 s_free_blocknr_hint;/* free data blocks count */
> + __be64 s_bitmap_start; /* data block in-use bitmap location */
> + __be32 s_bitmap_blocks;/* size of bitmap in number of blocks */
> + __be32 s_mtime; /* Mount time */
> + __be32 s_wtime; /* Write time */
> + __be16 s_magic; /* Magic signature */
> + char s_volume_name[16]; /* volume name */
> +};
Is there a particular reason to use big endian types for the data
structures? On a little endian machine you will end up converting values
everywhere. I assume that you don't expect the machine to change
endianess between reboots :-). If this is for generating/reading
filesystems from userspace, wouldn't it be better to have the userspace
tools specify the target endianess and do the conversions there?
~Ryan
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