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fs: fold open_check_o_direct into do_dentry_open

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do_dentry_open is where we do the actual open of the file, so this is
where we should do our O_DIRECT sanity check to cover all potential
callers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig 2018-03-20 11:30:14 +01:00 committed by Al Viro
parent 793057e1c7
commit cab64df194
3 changed files with 19 additions and 33 deletions
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1
fs/internal.h
View File

@ -111,7 +111,6 @@ extern struct file *do_filp_open(int dfd, struct filename *pathname,
extern struct file *do_file_open_root(struct dentry *, struct vfsmount *,
const char *, const struct open_flags *);
extern int open_check_o_direct(struct file *f);
extern int vfs_open(const struct path *, struct file *, const struct cred *);
extern struct file *filp_clone_open(struct file *);

7
fs/namei.c
View File

@ -3382,9 +3382,7 @@ static int do_last(struct nameidata *nd,
goto out;
*opened |= FILE_OPENED;
opened:
error = open_check_o_direct(file);
if (!error)
error = ima_file_check(file, op->acc_mode, *opened);
error = ima_file_check(file, op->acc_mode, *opened);
if (!error && will_truncate)
error = handle_truncate(file);
out:
@ -3464,9 +3462,6 @@ static int do_tmpfile(struct nameidata *nd, unsigned flags,
error = finish_open(file, child, NULL, opened);
if (error)
goto out2;
error = open_check_o_direct(file);
if (error)
fput(file);
out2:
mnt_drop_write(path.mnt);
out:

44
fs/open.c
View File

@ -682,16 +682,6 @@ SYSCALL_DEFINE3(fchown, unsigned int, fd, uid_t, user, gid_t, group)
return error;
}
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 *),
@ -713,7 +703,7 @@ 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;
return 0;
goto done;
}
if (f->f_mode & FMODE_WRITE && !special_file(inode->i_mode)) {
@ -766,7 +756,12 @@ 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:
@ -781,6 +776,9 @@ static int do_dentry_open(struct file *f,
f->f_path.dentry = NULL;
f->f_inode = NULL;
return error;
out_fput:
fput(f);
return error;
}
/**
@ -878,20 +876,14 @@ struct file *dentry_open(const struct path *path, int flags,
BUG_ON(!path->mnt);
f = get_empty_filp();
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);
}
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);
}
return f;
}