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authorNeilBrown <neilb@suse.de>2022-05-09 18:20:48 -0700
committerakpm <akpm@linux-foundation.org>2022-05-09 18:20:48 -0700
commit4b60c0ff2f2021ab99b7fb9da63b7ed1579ef1d8 (patch)
tree4fc4ec8223b77390776cca9ef63ba3f9e97f988b /fs/nfs
parent4c4a763406ef903b78334bd2ccea168d2f7a741a (diff)
downloadlinux-4b60c0ff2f2021ab99b7fb9da63b7ed1579ef1d8.tar.bz2
mm: move responsibility for setting SWP_FS_OPS to ->swap_activate
If a filesystem wishes to handle all swap IO itself (via ->direct_IO and ->readpage), rather than just providing devices addresses for submit_bio(), SWP_FS_OPS must be set. Currently the protocol for setting this it to have ->swap_activate return zero. In that case SWP_FS_OPS is set, and add_swap_extent() is called for the entire file. This is a little clumsy as different return values for ->swap_activate have quite different meanings, and it makes it hard to search for which filesystems require SWP_FS_OPS to be set. So remove the special meaning of a zero return, and require the filesystem to set SWP_FS_OPS if it so desires, and to always call add_swap_extent() as required. Currently only NFS and CIFS return zero for add_swap_extent(). Link: https://lkml.kernel.org/r/164859778123.29473.17908205846599043598.stgit@noble.brown Signed-off-by: NeilBrown <neilb@suse.de> Reviewed-by: Christoph Hellwig <hch@lst.de> Tested-by: David Howells <dhowells@redhat.com> Tested-by: Geert Uytterhoeven <geert+renesas@glider.be> Cc: Hugh Dickins <hughd@google.com> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Trond Myklebust <trond.myklebust@hammerspace.com> Cc: Miaohe Lin <linmiaohe@huawei.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'fs/nfs')
-rw-r--r--fs/nfs/file.c14
1 files changed, 12 insertions, 2 deletions
diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index 150b7fa8f0a7..a3a073604070 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -483,6 +483,7 @@ static int nfs_swap_activate(struct swap_info_struct *sis, struct file *file,
{
unsigned long blocks;
long long isize;
+ int ret;
struct inode *inode = file_inode(file);
struct rpc_clnt *clnt = NFS_CLIENT(inode);
struct nfs_client *cl = NFS_SERVER(inode)->nfs_client;
@@ -496,13 +497,22 @@ static int nfs_swap_activate(struct swap_info_struct *sis, struct file *file,
return -EINVAL;
}
- *span = sis->pages;
+ ret = rpc_clnt_swap_activate(clnt);
+ if (ret)
+ return ret;
+ ret = add_swap_extent(sis, 0, sis->max, 0);
+ if (ret < 0) {
+ rpc_clnt_swap_deactivate(clnt);
+ return ret;
+ }
+ *span = sis->pages;
if (cl->rpc_ops->enable_swap)
cl->rpc_ops->enable_swap(inode);
- return rpc_clnt_swap_activate(clnt);
+ sis->flags |= SWP_FS_OPS;
+ return ret;
}
static void nfs_swap_deactivate(struct file *file)