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fs: fold open_check_o_direct into do_dentry_open

Browse source 
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 <[email protected]>
Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Christoph Hellwig 2018-03-20 11:30:14 +01:00 • committed by Al Viro
commit cab64df194
3 changed files with 19 additions and 33 deletions
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44
fs/open.c
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@ -682,16 +682,6 @@ out:
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 @@ cleanup_file:
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;
}