On Fri, Jul 29, 2011 at 05:44:18PM +0400, Glauber Costa wrote:
> Simple patch that provides a function allowing its caller to set
> the maximum number of dentries that can exist at the same time
> at a given super block. Will be used in a later patch.
Pretty simple - probably better to put it in the patch that uses it,
I think.
> Signed-off-by: Glauber Costa <glommer@xxxxxxxxxxxxx>
> CC: Dave Chinner <david@xxxxxxxxxxxxx>
> ---
> fs/dcache.c | 12 ++++++++++++
> include/linux/dcache.h | 1 +
> 2 files changed, 13 insertions(+), 0 deletions(-)
>
> diff --git a/fs/dcache.c b/fs/dcache.c
> index 3bdb106..4369aa2 100644
> --- a/fs/dcache.c
> +++ b/fs/dcache.c
> @@ -1202,6 +1202,18 @@ static int dcache_mem_check(struct super_block *sb)
> return -ENOMEM;
> }
>
> +int vfs_set_dcache_size(struct super_block *sb, int size)
> +{
> + unsigned long dr = percpu_counter_sum_positive(&sb->s_nr_dentry);
> +
> + if (size != sb->s_nr_dentry_max)
> + prune_dcache_sb(sb, dr - size);
And why shrink if the new size > the current sb->s_nr_dentry_max?
And what happens when size > dr?
Cheers,
Dave.
--
Dave Chinner
david@xxxxxxxxxxxxx
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