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authorAl Viro <viro@zeniv.linux.org.uk>2009-12-19 10:10:39 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2009-12-22 12:27:34 -0500
commit482928d59db668b8d82a48717f78986d8cea72e9 (patch)
tree6985c64474172ddfb67c737bc4a49e588c49d055
parent628ff7c1d8d8466a5ad8078bd0206a130f8b8a51 (diff)
Fix f_flags/f_mode in case of lookup_instantiate_filp() from open(pathname, 3)
Just set f_flags when shoving struct file into nameidata; don't postpone that until __dentry_open(). do_filp_open() has correct value; lookup_instantiate_filp() doesn't - we lose the difference between O_RDWR and 3 by that point. We still set .intent.open.flags, so no fs code needs to be changed. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--fs/internal.h7
-rw-r--r--fs/namei.c6
-rw-r--r--fs/open.c13
-rw-r--r--include/linux/namei.h2
4 files changed, 17 insertions, 11 deletions
diff --git a/fs/internal.h b/fs/internal.h
index f67cd141d9a..e96a1667d74 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -85,3 +85,10 @@ extern struct file *get_empty_filp(void);
* super.c
*/
extern int do_remount_sb(struct super_block *, int, void *, int);
+
+/*
+ * open.c
+ */
+struct nameidata;
+extern struct file *nameidata_to_filp(struct nameidata *);
+extern void release_open_intent(struct nameidata *);
diff --git a/fs/namei.c b/fs/namei.c
index dad4b80257d..d517f73aa36 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1640,6 +1640,7 @@ struct file *do_filp_open(int dfd, const char *pathname,
if (filp == NULL)
return ERR_PTR(-ENFILE);
nd.intent.open.file = filp;
+ filp->f_flags = open_flag;
nd.intent.open.flags = flag;
nd.intent.open.create_mode = 0;
error = do_path_lookup(dfd, pathname,
@@ -1685,6 +1686,7 @@ struct file *do_filp_open(int dfd, const char *pathname,
if (filp == NULL)
goto exit_parent;
nd.intent.open.file = filp;
+ filp->f_flags = open_flag;
nd.intent.open.flags = flag;
nd.intent.open.create_mode = mode;
dir = nd.path.dentry;
@@ -1725,7 +1727,7 @@ do_last:
mnt_drop_write(nd.path.mnt);
goto exit;
}
- filp = nameidata_to_filp(&nd, open_flag);
+ filp = nameidata_to_filp(&nd);
mnt_drop_write(nd.path.mnt);
if (nd.root.mnt)
path_put(&nd.root);
@@ -1789,7 +1791,7 @@ ok:
mnt_drop_write(nd.path.mnt);
goto exit;
}
- filp = nameidata_to_filp(&nd, open_flag);
+ filp = nameidata_to_filp(&nd);
if (!IS_ERR(filp)) {
error = ima_path_check(&filp->f_path, filp->f_mode &
(MAY_READ | MAY_WRITE | MAY_EXEC));
diff --git a/fs/open.c b/fs/open.c
index ca69241796b..6daee28f6e8 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -821,15 +821,14 @@ static inline int __get_file_write_access(struct inode *inode,
}
static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt,
- int flags, struct file *f,
+ struct file *f,
int (*open)(struct inode *, struct file *),
const struct cred *cred)
{
struct inode *inode;
int error;
- f->f_flags = flags;
- f->f_mode = (__force fmode_t)((flags+1) & O_ACCMODE) | FMODE_LSEEK |
+ f->f_mode = (__force fmode_t)((f->f_flags+1) & O_ACCMODE) | FMODE_LSEEK |
FMODE_PREAD | FMODE_PWRITE;
inode = dentry->d_inode;
if (f->f_mode & FMODE_WRITE) {
@@ -930,7 +929,6 @@ struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry
if (IS_ERR(dentry))
goto out_err;
nd->intent.open.file = __dentry_open(dget(dentry), mntget(nd->path.mnt),
- nd->intent.open.flags - 1,
nd->intent.open.file,
open, cred);
out:
@@ -949,7 +947,7 @@ EXPORT_SYMBOL_GPL(lookup_instantiate_filp);
*
* Note that this function destroys the original nameidata
*/
-struct file *nameidata_to_filp(struct nameidata *nd, int flags)
+struct file *nameidata_to_filp(struct nameidata *nd)
{
const struct cred *cred = current_cred();
struct file *filp;
@@ -958,7 +956,7 @@ struct file *nameidata_to_filp(struct nameidata *nd, int flags)
filp = nd->intent.open.file;
/* Has the filesystem initialised the file for us? */
if (filp->f_path.dentry == NULL)
- filp = __dentry_open(nd->path.dentry, nd->path.mnt, flags, filp,
+ filp = __dentry_open(nd->path.dentry, nd->path.mnt, filp,
NULL, cred);
else
path_put(&nd->path);
@@ -997,7 +995,8 @@ struct file *dentry_open(struct dentry *dentry, struct vfsmount *mnt, int flags,
return ERR_PTR(error);
}
- return __dentry_open(dentry, mnt, flags, f, NULL, cred);
+ f->f_flags = flags;
+ return __dentry_open(dentry, mnt, f, NULL, cred);
}
EXPORT_SYMBOL(dentry_open);
diff --git a/include/linux/namei.h b/include/linux/namei.h
index 02894675028..05b441d9364 100644
--- a/include/linux/namei.h
+++ b/include/linux/namei.h
@@ -72,8 +72,6 @@ extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
extern struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry,
int (*open)(struct inode *, struct file *));
-extern struct file *nameidata_to_filp(struct nameidata *nd, int flags);
-extern void release_open_intent(struct nameidata *);
extern struct dentry *lookup_one_len(const char *, struct dentry *, int);