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    Subject[PATCH] UBIFS: introduce LEB overhead
    Date
    From: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

    This is a preparational patch for the following statfs()
    report fix.

    Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
    ---
    fs/ubifs/super.c | 6 ++++++
    fs/ubifs/ubifs.h | 5 +++++
    2 files changed, 11 insertions(+), 0 deletions(-)

    diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
    index 1018053..be23fd3 100644
    --- a/fs/ubifs/super.c
    +++ b/fs/ubifs/super.c
    @@ -530,6 +530,12 @@ static int init_constants_early(struct ubifs_info *c)
    c->dead_wm = ALIGN(MIN_WRITE_SZ, c->min_io_size);
    c->dark_wm = ALIGN(UBIFS_MAX_NODE_SZ, c->min_io_size);

    + /*
    + * Calculate how many bytes would be wasted at the end of LEB if it was
    + * fully filled with data nodes of maximum size. This is used in
    + * calculations when reporting free space.
    + */
    + c->leb_overhead = c->leb_size % UBIFS_MAX_DATA_NODE_SZ;
    return 0;
    }

    diff --git a/fs/ubifs/ubifs.h b/fs/ubifs/ubifs.h
    index 681d46e..57e5854 100644
    --- a/fs/ubifs/ubifs.h
    +++ b/fs/ubifs/ubifs.h
    @@ -995,6 +995,9 @@ struct ubifs_mount_opts {
    * @max_idx_node_sz: maximum indexing node aligned on 8-bytes boundary
    * @max_inode_sz: maximum possible inode size in bytes
    * @max_znode_sz: size of znode in bytes
    + *
    + * @leb_overhead: how many bytes are wasted in an LEB when it is filled with
    + * data nodes of maximum size - used in free space reporting
    * @dead_wm: LEB dead space watermark
    * @dark_wm: LEB dark space watermark
    * @block_cnt: count of 4KiB blocks on the FS
    @@ -1226,6 +1229,8 @@ struct ubifs_info {
    int max_idx_node_sz;
    long long max_inode_sz;
    int max_znode_sz;
    +
    + int leb_overhead;
    int dead_wm;
    int dark_wm;
    int block_cnt;
    --
    1.5.4.1


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