lkml.org 
[lkml]   [2009]   [Apr]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 33/41] NFS: Invalidate FsCache page flags when cache removed [ver #48]
    Date
    Invalidate the FsCache page flags on the pages belonging to an inode when the
    cache backing that NFS inode is removed.

    This allows a live cache to be withdrawn.

    Signed-off-by: David Howells <dhowells@redhat.com>
    Acked-by: Steve Dickson <steved@redhat.com>
    Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
    Acked-by: Al Viro <viro@zeniv.linux.org.uk>
    Tested-by: Daire Byrne <Daire.Byrne@framestore.com>
    ---

    fs/nfs/fscache-index.c | 40 ++++++++++++++++++++++++++++++++++++++++
    1 files changed, 40 insertions(+), 0 deletions(-)


    diff --git a/fs/nfs/fscache-index.c b/fs/nfs/fscache-index.c
    index 7bc54ac..a119b56 100644
    --- a/fs/nfs/fscache-index.c
    +++ b/fs/nfs/fscache-index.c
    @@ -253,6 +253,45 @@ enum fscache_checkaux nfs_fscache_inode_check_aux(void *cookie_netfs_data,
    }

    /*
    + * Indication from FS-Cache that the cookie is no longer cached
    + * - This function is called when the backing store currently caching a cookie
    + * is removed
    + * - The netfs should use this to clean up any markers indicating cached pages
    + * - This is mandatory for any object that may have data
    + */
    +static void nfs_fscache_inode_now_uncached(void *cookie_netfs_data)
    +{
    + struct nfs_inode *nfsi = cookie_netfs_data;
    + struct pagevec pvec;
    + pgoff_t first;
    + int loop, nr_pages;
    +
    + pagevec_init(&pvec, 0);
    + first = 0;
    +
    + dprintk("NFS: nfs_inode_now_uncached: nfs_inode 0x%p\n", nfsi);
    +
    + for (;;) {
    + /* grab a bunch of pages to unmark */
    + nr_pages = pagevec_lookup(&pvec,
    + nfsi->vfs_inode.i_mapping,
    + first,
    + PAGEVEC_SIZE - pagevec_count(&pvec));
    + if (!nr_pages)
    + break;
    +
    + for (loop = 0; loop < nr_pages; loop++)
    + ClearPageFsCache(pvec.pages[loop]);
    +
    + first = pvec.pages[nr_pages - 1]->index + 1;
    +
    + pvec.nr = nr_pages;
    + pagevec_release(&pvec);
    + cond_resched();
    + }
    +}
    +
    +/*
    * Define the inode object for FS-Cache. This is used to describe an inode
    * object to fscache_acquire_cookie(). It is keyed by the NFS file handle for
    * an inode.
    @@ -268,4 +307,5 @@ const struct fscache_cookie_def nfs_fscache_inode_object_def = {
    .get_attr = nfs_fscache_inode_get_attr,
    .get_aux = nfs_fscache_inode_get_aux,
    .check_aux = nfs_fscache_inode_check_aux,
    + .now_uncached = nfs_fscache_inode_now_uncached,
    };


    \
     
     \ /
      Last update: 2009-04-03 18:15    [W:0.037 / U:0.104 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site