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autofs: add autofs_dev_ioctl_version() for AUTOFS_DEV_IOCTL_VERSION_CMD

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No functional changes, based on the following justification.

1. Make the code more consistent using the ioctl vector _ioctls[],
   rather than assigning NULL only for this ioctl command.
2. Remove goto done; for better maintainability in the long run.
3. The existing code is based on the fact that validate_dev_ioctl()
   sets ioctl version for any command, but AUTOFS_DEV_IOCTL_VERSION_CMD
   should explicitly set it regardless of the default behavior.

Link: http://lkml.kernel.org/r/20160812024846.12352.9885.stgit@pluto.themaw.net
Signed-off-by: Tomohiro Kusumi <kusumi.tomohiro@gmail.com>
Signed-off-by: Ian Kent <ikent@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ian Kent 2016-10-11 13:53:05 -07:00 committed by Linus Torvalds
parent aa8419367b
commit d9e1923207
1 changed files with 17 additions and 8 deletions
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25
fs/autofs4/dev-ioctl.c
View File

@ -172,6 +172,17 @@ static struct autofs_sb_info *autofs_dev_ioctl_sbi(struct file *f)
return sbi;
}
/* Return autofs dev ioctl version */
static int autofs_dev_ioctl_version(struct file *fp,
struct autofs_sb_info *sbi,
struct autofs_dev_ioctl *param)
{
/* This should have already been set. */
param->ver_major = AUTOFS_DEV_IOCTL_VERSION_MAJOR;
param->ver_minor = AUTOFS_DEV_IOCTL_VERSION_MINOR;
return 0;
}
/* Return autofs module protocol version */
static int autofs_dev_ioctl_protover(struct file *fp,
struct autofs_sb_info *sbi,
@ -590,7 +601,8 @@ static ioctl_fn lookup_dev_ioctl(unsigned int cmd)
int cmd;
ioctl_fn fn;
} _ioctls[] = {
{cmd_idx(AUTOFS_DEV_IOCTL_VERSION_CMD), NULL},
{cmd_idx(AUTOFS_DEV_IOCTL_VERSION_CMD),
autofs_dev_ioctl_version},
{cmd_idx(AUTOFS_DEV_IOCTL_PROTOVER_CMD),
autofs_dev_ioctl_protover},
{cmd_idx(AUTOFS_DEV_IOCTL_PROTOSUBVER_CMD),
@ -655,10 +667,6 @@ static int _autofs_dev_ioctl(unsigned int command,
if (err)
goto out;
/* The validate routine above always sets the version */
if (cmd == AUTOFS_DEV_IOCTL_VERSION_CMD)
goto done;
fn = lookup_dev_ioctl(cmd);
if (!fn) {
pr_warn("unknown command 0x%08x\n", command);
@ -672,9 +680,11 @@ static int _autofs_dev_ioctl(unsigned int command,
/*
* For obvious reasons the openmount can't have a file
* descriptor yet. We don't take a reference to the
* file during close to allow for immediate release.
* file during close to allow for immediate release,
* and the same for retrieving ioctl version.
*/
if (cmd != AUTOFS_DEV_IOCTL_OPENMOUNT_CMD &&
if (cmd != AUTOFS_DEV_IOCTL_VERSION_CMD &&
cmd != AUTOFS_DEV_IOCTL_OPENMOUNT_CMD &&
cmd != AUTOFS_DEV_IOCTL_CLOSEMOUNT_CMD) {
fp = fget(param->ioctlfd);
if (!fp) {
@ -707,7 +717,6 @@ cont:
if (fp)
fput(fp);
done:
if (err >= 0 && copy_to_user(user, param, AUTOFS_DEV_IOCTL_SIZE))
err = -EFAULT;
out: