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cifs: have cifs_fattr_to_inode() refuse to change type on live inode

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... instead of trying to do that in the callers (and missing some,
at that)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2021-02-10 21:23:04 -05:00
parent 3bcb39b086
commit 4d66952a20
4 changed files with 18 additions and 32 deletions
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2
fs/cifs/cifsproto.h
View File

@ -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);

2
fs/cifs/file.c
View File

@ -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:

42
fs/cifs/inode.c
View File

@ -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;

4
fs/cifs/readdir.c
View File

@ -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;
}