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| author | Trond Myklebust <trond.myklebust@hammerspace.com> | 2021-03-29 23:46:05 +0300 |
|---|---|---|
| committer | Trond Myklebust <trond.myklebust@hammerspace.com> | 2021-04-13 00:14:17 +0300 |
| commit | 9fdbfad1777cb4638f489eeb62d85432010c0031 (patch) | |
| tree | db7380727b54a1bae6ae474b925782554d5c0ab6 | |
| parent | 99f23783224355e7022ceea9b8d9f62c0fd01bd8 (diff) | |
| download | linux-9fdbfad1777cb4638f489eeb62d85432010c0031.tar.xz | |
NFS: Deal correctly with attribute generation counter overflow
We need to use unsigned long subtraction and then convert to signed in
order to deal correcly with C overflow rules.
Fixes: f5062003465c ("NFS: Set an attribute barrier on all updates")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
| -rw-r--r-- | fs/nfs/inode.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c index ff737be559dc..8de5b3b9da91 100644 --- a/fs/nfs/inode.c +++ b/fs/nfs/inode.c @@ -1662,10 +1662,10 @@ EXPORT_SYMBOL_GPL(_nfs_display_fhandle); */ static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr) { - const struct nfs_inode *nfsi = NFS_I(inode); + unsigned long attr_gencount = NFS_I(inode)->attr_gencount; - return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 || - ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0); + return (long)(fattr->gencount - attr_gencount) > 0 || + (long)(attr_gencount - nfs_read_attr_generation_counter()) > 0; } static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr) @@ -2094,7 +2094,7 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr) nfsi->attrtimeo_timestamp = now; } /* Set the barrier to be more recent than this fattr */ - if ((long)fattr->gencount - (long)nfsi->attr_gencount > 0) + if ((long)(fattr->gencount - nfsi->attr_gencount) > 0) nfsi->attr_gencount = fattr->gencount; } |