From: Al Viro viro@zeniv.linux.org.uk
[ Upstream commit 6e3e2c4362e41a2f18e3f7a5ad81bd2f49a47b85 ]
inode_wrong_type(inode, mode) returns true if setting inode->i_mode to given value would've changed the inode type. We have enough of those checks open-coded to make a helper worthwhile.
Signed-off-by: Al Viro viro@zeniv.linux.org.uk Cc: stable@vger.kernel.org Signed-off-by: Amir Goldstein amir73il@gmail.com --- fs/9p/vfs_inode.c | 4 ++-- fs/9p/vfs_inode_dotl.c | 4 ++-- fs/cifs/inode.c | 5 ++--- fs/fuse/dir.c | 6 +++--- fs/fuse/inode.c | 2 +- fs/fuse/readdir.c | 2 +- fs/nfs/inode.c | 6 +++--- fs/nfsd/nfsproc.c | 2 +- fs/overlayfs/namei.c | 4 ++-- include/linux/fs.h | 5 +++++ 10 files changed, 22 insertions(+), 18 deletions(-)
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c index ae0c38ad1fcb..0791480bf922 100644 --- a/fs/9p/vfs_inode.c +++ b/fs/9p/vfs_inode.c @@ -398,7 +398,7 @@ static int v9fs_test_inode(struct inode *inode, void *data)
umode = p9mode2unixmode(v9ses, st, &rdev); /* don't match inode of different type */ - if ((inode->i_mode & S_IFMT) != (umode & S_IFMT)) + if (inode_wrong_type(inode, umode)) return 0;
/* compare qid details */ @@ -1360,7 +1360,7 @@ int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode) * Don't update inode if the file type is different */ umode = p9mode2unixmode(v9ses, st, &rdev); - if ((inode->i_mode & S_IFMT) != (umode & S_IFMT)) + if (inode_wrong_type(inode, umode)) goto out;
/* diff --git a/fs/9p/vfs_inode_dotl.c b/fs/9p/vfs_inode_dotl.c index 0028eccb665a..72b67d810b8c 100644 --- a/fs/9p/vfs_inode_dotl.c +++ b/fs/9p/vfs_inode_dotl.c @@ -59,7 +59,7 @@ static int v9fs_test_inode_dotl(struct inode *inode, void *data) struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
/* don't match inode of different type */ - if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT)) + if (inode_wrong_type(inode, st->st_mode)) return 0;
if (inode->i_generation != st->st_gen) @@ -933,7 +933,7 @@ int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode) /* * Don't update inode if the file type is different */ - if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT)) + if (inode_wrong_type(inode, st->st_mode)) goto out;
/* diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c index b1f0c05d6eaf..b11a919b9cab 100644 --- a/fs/cifs/inode.c +++ b/fs/cifs/inode.c @@ -425,8 +425,7 @@ int cifs_get_inode_info_unix(struct inode **pinode, }
/* if filetype is different, return error */ - if (unlikely(((*pinode)->i_mode & S_IFMT) != - (fattr.cf_mode & S_IFMT))) { + if (unlikely(inode_wrong_type(*pinode, fattr.cf_mode))) { CIFS_I(*pinode)->time = 0; /* force reval */ rc = -ESTALE; goto cgiiu_exit; @@ -1243,7 +1242,7 @@ cifs_find_inode(struct inode *inode, void *opaque) return 0;
/* don't match inode of different type */ - if ((inode->i_mode & S_IFMT) != (fattr->cf_mode & S_IFMT)) + if (inode_wrong_type(inode, fattr->cf_mode)) return 0;
/* if it's not a directory or has no dentries, then flag it */ diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c index 756bbdd563e0..37d50dde845e 100644 --- a/fs/fuse/dir.c +++ b/fs/fuse/dir.c @@ -252,7 +252,7 @@ static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags) if (ret == -ENOMEM) goto out; if (ret || fuse_invalid_attr(&outarg.attr) || - (outarg.attr.mode ^ inode->i_mode) & S_IFMT) + inode_wrong_type(inode, outarg.attr.mode)) goto invalid;
forget_all_cached_acls(inode); @@ -1062,7 +1062,7 @@ static int fuse_do_getattr(struct inode *inode, struct kstat *stat, err = fuse_simple_request(fm, &args); if (!err) { if (fuse_invalid_attr(&outarg.attr) || - (inode->i_mode ^ outarg.attr.mode) & S_IFMT) { + inode_wrong_type(inode, outarg.attr.mode)) { fuse_make_bad(inode); err = -EIO; } else { @@ -1699,7 +1699,7 @@ int fuse_do_setattr(struct dentry *dentry, struct iattr *attr, }
if (fuse_invalid_attr(&outarg.attr) || - (inode->i_mode ^ outarg.attr.mode) & S_IFMT) { + inode_wrong_type(inode, outarg.attr.mode)) { fuse_make_bad(inode); err = -EIO; goto error; diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c index f94b0bb57619..6345c4679fb8 100644 --- a/fs/fuse/inode.c +++ b/fs/fuse/inode.c @@ -340,7 +340,7 @@ struct inode *fuse_iget(struct super_block *sb, u64 nodeid, inode->i_generation = generation; fuse_init_inode(inode, attr); unlock_new_inode(inode); - } else if ((inode->i_mode ^ attr->mode) & S_IFMT) { + } else if (inode_wrong_type(inode, attr->mode)) { /* Inode has changed type, any I/O on the old should fail */ fuse_make_bad(inode); iput(inode); diff --git a/fs/fuse/readdir.c b/fs/fuse/readdir.c index 3441ffa740f3..277f7041d55a 100644 --- a/fs/fuse/readdir.c +++ b/fs/fuse/readdir.c @@ -202,7 +202,7 @@ static int fuse_direntplus_link(struct file *file, inode = d_inode(dentry); if (!inode || get_node_id(inode) != o->nodeid || - ((o->attr.mode ^ inode->i_mode) & S_IFMT)) { + inode_wrong_type(inode, o->attr.mode)) { d_invalidate(dentry); dput(dentry); goto retry; diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c index 9811880470a0..21addb78523d 100644 --- a/fs/nfs/inode.c +++ b/fs/nfs/inode.c @@ -322,7 +322,7 @@ nfs_find_actor(struct inode *inode, void *opaque)
if (NFS_FILEID(inode) != fattr->fileid) return 0; - if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode)) + if (inode_wrong_type(inode, fattr->mode)) return 0; if (nfs_compare_fh(NFS_FH(inode), fh)) return 0; @@ -1446,7 +1446,7 @@ static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fat return 0; return -ESTALE; } - if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) + if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode)) return -ESTALE;
@@ -1861,7 +1861,7 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr) /* * Make sure the inode's type hasn't changed. */ - if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) { + if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode)) { /* * Big trouble! The inode has become a different object. */ diff --git a/fs/nfsd/nfsproc.c b/fs/nfsd/nfsproc.c index 0d71549f9d42..9c9de2b66e64 100644 --- a/fs/nfsd/nfsproc.c +++ b/fs/nfsd/nfsproc.c @@ -376,7 +376,7 @@ nfsd_proc_create(struct svc_rqst *rqstp)
/* Make sure the type and device matches */ resp->status = nfserr_exist; - if (inode && type != (inode->i_mode & S_IFMT)) + if (inode && inode_wrong_type(inode, type)) goto out_unlock; }
diff --git a/fs/overlayfs/namei.c b/fs/overlayfs/namei.c index f3309e044f07..092812c2f118 100644 --- a/fs/overlayfs/namei.c +++ b/fs/overlayfs/namei.c @@ -366,7 +366,7 @@ int ovl_check_origin_fh(struct ovl_fs *ofs, struct ovl_fh *fh, bool connected, return PTR_ERR(origin);
if (upperdentry && !ovl_is_whiteout(upperdentry) && - ((d_inode(origin)->i_mode ^ d_inode(upperdentry)->i_mode) & S_IFMT)) + inode_wrong_type(d_inode(upperdentry), d_inode(origin)->i_mode)) goto invalid;
if (!*stackp) @@ -724,7 +724,7 @@ struct dentry *ovl_lookup_index(struct ovl_fs *ofs, struct dentry *upper, index = ERR_PTR(-ESTALE); goto out; } else if (ovl_dentry_weird(index) || ovl_is_whiteout(index) || - ((inode->i_mode ^ d_inode(origin)->i_mode) & S_IFMT)) { + inode_wrong_type(inode, d_inode(origin)->i_mode)) { /* * Index should always be of the same file type as origin * except for the case of a whiteout index. A whiteout diff --git a/include/linux/fs.h b/include/linux/fs.h index 8bde32cf9711..43bb6a51e42d 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -2768,6 +2768,11 @@ static inline bool execute_ok(struct inode *inode) return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode); }
+static inline bool inode_wrong_type(const struct inode *inode, umode_t mode) +{ + return (inode->i_mode ^ mode) & S_IFMT; +} + static inline void file_start_write(struct file *file) { if (!S_ISREG(file_inode(file)->i_mode))