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authorAl Viro <viro@zeniv.linux.org.uk>2021-02-11 03:23:04 +0100
committerAl Viro <viro@zeniv.linux.org.uk>2021-03-13 04:15:20 +0100
commit4d66952a2032cf6b65183fc4a8d8039304c70d48 (patch)
tree32ab5eedf7ae87418e9cf314dd357cf95234662d /fs/cifs
parentcifs: have ->mkdir() handle race with another client sanely (diff)
downloadlinux-4d66952a2032cf6b65183fc4a8d8039304c70d48.tar.xz
linux-4d66952a2032cf6b65183fc4a8d8039304c70d48.zip
cifs: have cifs_fattr_to_inode() refuse to change type on live inode
... instead of trying to do that in the callers (and missing some, at that) Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/cifs')
-rw-r--r--fs/cifs/cifsproto.h2
-rw-r--r--fs/cifs/file.c2
-rw-r--r--fs/cifs/inode.c42
-rw-r--r--fs/cifs/readdir.c4
4 files changed, 18 insertions, 32 deletions
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 75ce6f742b8d..2a72dc24b00a 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -194,7 +194,7 @@ extern void cifs_unix_basic_to_fattr(struct cifs_fattr *fattr,
struct cifs_sb_info *cifs_sb);
extern void cifs_dir_info_to_fattr(struct cifs_fattr *, FILE_DIRECTORY_INFO *,
struct cifs_sb_info *);
-extern void cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr);
+extern int cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr);
extern struct inode *cifs_iget(struct super_block *sb,
struct cifs_fattr *fattr);
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 26de4329d161..78266f0e0595 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -165,7 +165,7 @@ int cifs_posix_open(char *full_path, struct inode **pinode,
goto posix_open_ret;
}
} else {
- cifs_fattr_to_inode(*pinode, &fattr);
+ rc = cifs_fattr_to_inode(*pinode, &fattr);
}
posix_open_ret:
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 80c487fcf10e..51cb1ca829ec 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -157,12 +157,18 @@ cifs_nlink_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
}
/* populate an inode with info from a cifs_fattr struct */
-void
+int
cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
{
struct cifsInodeInfo *cifs_i = CIFS_I(inode);
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+ if (!(inode->i_state & I_NEW) &&
+ unlikely(inode_wrong_type(inode, fattr->cf_mode))) {
+ CIFS_I(inode)->time = 0; /* force reval */
+ return -ESTALE;
+ }
+
cifs_revalidate_cache(inode, fattr);
spin_lock(&inode->i_lock);
@@ -219,6 +225,7 @@ cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
inode->i_flags |= S_AUTOMOUNT;
if (inode->i_state & I_NEW)
cifs_set_ops(inode);
+ return 0;
}
void
@@ -363,7 +370,7 @@ cifs_get_file_info_unix(struct file *filp)
rc = 0;
}
- cifs_fattr_to_inode(inode, &fattr);
+ rc = cifs_fattr_to_inode(inode, &fattr);
free_xid(xid);
return rc;
}
@@ -426,13 +433,7 @@ int cifs_get_inode_info_unix(struct inode **pinode,
}
/* if filetype is different, return error */
- if (unlikely(inode_wrong_type(*pinode, fattr.cf_mode))) {
- CIFS_I(*pinode)->time = 0; /* force reval */
- rc = -ESTALE;
- goto cgiiu_exit;
- }
-
- cifs_fattr_to_inode(*pinode, &fattr);
+ rc = cifs_fattr_to_inode(*pinode, &fattr);
}
cgiiu_exit:
@@ -782,7 +783,8 @@ cifs_get_file_info(struct file *filp)
*/
fattr.cf_uniqueid = CIFS_I(inode)->uniqueid;
fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
- cifs_fattr_to_inode(inode, &fattr);
+ /* if filetype is different, return error */
+ rc = cifs_fattr_to_inode(inode, &fattr);
cgfi_exit:
free_xid(xid);
return rc;
@@ -1099,16 +1101,8 @@ handle_mnt_opt:
rc = -ESTALE;
goto out;
}
-
/* if filetype is different, return error */
- if (unlikely(((*inode)->i_mode & S_IFMT) !=
- (fattr.cf_mode & S_IFMT))) {
- CIFS_I(*inode)->time = 0; /* force reval */
- rc = -ESTALE;
- goto out;
- }
-
- cifs_fattr_to_inode(*inode, &fattr);
+ rc = cifs_fattr_to_inode(*inode, &fattr);
}
out:
cifs_buf_release(smb1_backup_rsp_buf);
@@ -1214,14 +1208,7 @@ smb311_posix_get_inode_info(struct inode **inode,
}
/* if filetype is different, return error */
- if (unlikely(((*inode)->i_mode & S_IFMT) !=
- (fattr.cf_mode & S_IFMT))) {
- CIFS_I(*inode)->time = 0; /* force reval */
- rc = -ESTALE;
- goto out;
- }
-
- cifs_fattr_to_inode(*inode, &fattr);
+ rc = cifs_fattr_to_inode(*inode, &fattr);
}
out:
cifs_put_tlink(tlink);
@@ -1316,6 +1303,7 @@ retry_iget5_locked:
}
}
+ /* can't fail - see cifs_find_inode() */
cifs_fattr_to_inode(inode, fattr);
if (sb->s_flags & SB_NOATIME)
inode->i_flags |= S_NOATIME | S_NOCMTIME;
diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c
index 80bf4c6f4c7b..e563c0fb47cb 100644
--- a/fs/cifs/readdir.c
+++ b/fs/cifs/readdir.c
@@ -119,9 +119,7 @@ retry:
/* update inode in place
* if both i_ino and i_mode didn't change */
if (CIFS_I(inode)->uniqueid == fattr->cf_uniqueid &&
- (inode->i_mode & S_IFMT) ==
- (fattr->cf_mode & S_IFMT)) {
- cifs_fattr_to_inode(inode, fattr);
+ cifs_fattr_to_inode(inode, fattr) == 0) {
dput(dentry);
return;
}