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-rw-r--r--fs/open.c44
1 files changed, 26 insertions, 18 deletions
diff --git a/fs/open.c b/fs/open.c
index c5ee7cd60424..d0e955b558ad 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -724,6 +724,16 @@ SYSCALL_DEFINE3(fchown, unsigned int, fd, uid_t, user, gid_t, group)
return ksys_fchown(fd, user, group);
}
+int open_check_o_direct(struct file *f)
+{
+ /* NB: we're sure to have correct a_ops only after f_op->open */
+ if (f->f_flags & O_DIRECT) {
+ if (!f->f_mapping->a_ops || !f->f_mapping->a_ops->direct_IO)
+ return -EINVAL;
+ }
+ return 0;
+}
+
static int do_dentry_open(struct file *f,
struct inode *inode,
int (*open)(struct inode *, struct file *),
@@ -745,7 +755,7 @@ static int do_dentry_open(struct file *f,
if (unlikely(f->f_flags & O_PATH)) {
f->f_mode = FMODE_PATH;
f->f_op = &empty_fops;
- goto done;
+ return 0;
}
if (f->f_mode & FMODE_WRITE && !special_file(inode->i_mode)) {
@@ -798,12 +808,7 @@ static int do_dentry_open(struct file *f,
f->f_flags &= ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);
file_ra_state_init(&f->f_ra, f->f_mapping->host->i_mapping);
-done:
- /* NB: we're sure to have correct a_ops only after f_op->open */
- error = -EINVAL;
- if ((f->f_flags & O_DIRECT) &&
- (!f->f_mapping->a_ops || !f->f_mapping->a_ops->direct_IO))
- goto out_fput;
+
return 0;
cleanup_all:
@@ -818,9 +823,6 @@ cleanup_file:
f->f_path.dentry = NULL;
f->f_inode = NULL;
return error;
-out_fput:
- fput(f);
- return error;
}
/**
@@ -918,14 +920,20 @@ struct file *dentry_open(const struct path *path, int flags,
BUG_ON(!path->mnt);
f = get_empty_filp();
- if (IS_ERR(f))
- return f;
-
- f->f_flags = flags;
- error = vfs_open(path, f, cred);
- if (error) {
- put_filp(f);
- return ERR_PTR(error);
+ if (!IS_ERR(f)) {
+ f->f_flags = flags;
+ error = vfs_open(path, f, cred);
+ if (!error) {
+ /* from now on we need fput() to dispose of f */
+ error = open_check_o_direct(f);
+ if (error) {
+ fput(f);
+ f = ERR_PTR(error);
+ }
+ } else {
+ put_filp(f);
+ f = ERR_PTR(error);
+ }
}
return f;
}