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fs/nfs, swapon: check holes in swapfile

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swapon over NFS does not go through generic_swapfile_activate
code path when setting up extents. This makes holes in NFS
swapfiles possible which is not expected for swapon.

Signed-off-by: Murphy Zhou <jencce.kernel@gmail.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Murphy Zhou 2020-01-02 16:04:26 +08:00 committed by Anna Schumaker
parent b8457606d9
commit bd89bc67f6
1 changed files with 12 additions and 0 deletions
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12
fs/nfs/file.c
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@ -489,7 +489,19 @@ static int nfs_launder_page(struct page *page)
static int nfs_swap_activate(struct swap_info_struct *sis, struct file *file,
sector_t *span)
{
unsigned long blocks;
long long isize;
struct rpc_clnt *clnt = NFS_CLIENT(file->f_mapping->host);
struct inode *inode = file->f_mapping->host;
spin_lock(&inode->i_lock);
blocks = inode->i_blocks;
isize = inode->i_size;
spin_unlock(&inode->i_lock);
if (blocks*512 < isize) {
pr_warn("swap activate: swapfile has holes\n");
return -EINVAL;
}
*span = sis->pages;