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autofs: add AUTOFS_EXP_FORCED flag

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The userspace automount(8) daemon is meant to perform a forced expire when
sent a SIGUSR2.

But since the expiration is routed through the kernel and the kernel
doesn't send an expire request if the mount is busy this hasn't worked at
least since autofs version 5.

Add an AUTOFS_EXP_FORCED flag to allow implemention of the feature and
bump the protocol version so user space can check if it's implemented if
needed.

Link: http://lkml.kernel.org/r/152937734715.21213.6594007182776598970.stgit@pluto.themaw.net
Signed-off-by: Ian Kent <raven@themaw.net>
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 2018-08-21 21:59:01 -07:00 committed by Linus Torvalds
parent e5c85e1fe1
commit cbf6898fd6
2 changed files with 55 additions and 15 deletions
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62
fs/autofs/expire.c
View File

@ -29,7 +29,8 @@ static inline int autofs_can_expire(struct dentry *dentry,
}
/* Check a mount point for busyness */
static int autofs_mount_busy(struct vfsmount *mnt, struct dentry *dentry)
static int autofs_mount_busy(struct vfsmount *mnt,
struct dentry *dentry, unsigned int how)
{
struct dentry *top = dentry;
struct path path = {.mnt = mnt, .dentry = dentry};
@ -50,6 +51,12 @@ static int autofs_mount_busy(struct vfsmount *mnt, struct dentry *dentry)
goto done;
}
/* Not a submount, has a forced expire been requested */
if (how & AUTOFS_EXP_FORCED) {
status = 0;
goto done;
}
/* Update the expiry counter if fs is busy */
if (!may_umount_tree(path.mnt)) {
struct autofs_info *ino;
@ -189,6 +196,10 @@ static int autofs_direct_busy(struct vfsmount *mnt,
{
pr_debug("top %p %pd\n", top, top);
/* Forced expire, user space handles busy mounts */
if (how & AUTOFS_EXP_FORCED)
return 0;
/* If it's busy update the expiry counters */
if (!may_umount_tree(mnt)) {
struct autofs_info *ino;
@ -235,7 +246,7 @@ static int autofs_tree_busy(struct vfsmount *mnt,
* If the fs is busy update the expiry counter.
*/
if (d_mountpoint(p)) {
if (autofs_mount_busy(mnt, p)) {
if (autofs_mount_busy(mnt, p, how)) {
top_ino->last_used = jiffies;
dput(p);
return 1;
@ -258,6 +269,10 @@ static int autofs_tree_busy(struct vfsmount *mnt,
}
}
/* Forced expire, user space handles busy mounts */
if (how & AUTOFS_EXP_FORCED)
return 0;
/* Timeout of a tree mount is ultimately determined by its top dentry */
if (!autofs_can_expire(top, timeout, how))
return 1;
@ -280,9 +295,15 @@ static struct dentry *autofs_check_leaves(struct vfsmount *mnt,
if (d_mountpoint(p)) {
/* Can we umount this guy */
if (autofs_mount_busy(mnt, p))
if (autofs_mount_busy(mnt, p, how))
continue;
/* This isn't a submount so if a forced expire
* has been requested, user space handles busy
* mounts */
if (how & AUTOFS_EXP_FORCED)
return p;
/* Can we expire this guy */
if (autofs_can_expire(p, timeout, how))
return p;
@ -361,9 +382,15 @@ static struct dentry *should_expire(struct dentry *dentry,
pr_debug("checking mountpoint %p %pd\n", dentry, dentry);
/* Can we umount this guy */
if (autofs_mount_busy(mnt, dentry))
if (autofs_mount_busy(mnt, dentry, how))
return NULL;
/* This isn't a submount so if a forced expire
* has been requested, user space handles busy
* mounts */
if (how & AUTOFS_EXP_FORCED)
return dentry;
/* Can we expire this guy */
if (autofs_can_expire(dentry, timeout, how))
return dentry;
@ -372,6 +399,11 @@ static struct dentry *should_expire(struct dentry *dentry,
if (d_really_is_positive(dentry) && d_is_symlink(dentry)) {
pr_debug("checking symlink %p %pd\n", dentry, dentry);
/* Forced expire, user space handles busy mounts */
if (how & AUTOFS_EXP_FORCED)
return dentry;
/*
* A symlink can't be "busy" in the usual sense so
* just check last used for expire timeout.
@ -386,10 +418,13 @@ static struct dentry *should_expire(struct dentry *dentry,
/* Case 2: tree mount, expire iff entire tree is not busy */
if (!(how & AUTOFS_EXP_LEAVES)) {
/* Path walk currently on this dentry? */
ino_count = atomic_read(&ino->count) + 1;
if (d_count(dentry) > ino_count)
return NULL;
/* Not a forced expire? */
if (!(how & AUTOFS_EXP_FORCED)) {
/* ref-walk currently on this dentry? */
ino_count = atomic_read(&ino->count) + 1;
if (d_count(dentry) > ino_count)
return NULL;
}
if (!autofs_tree_busy(mnt, dentry, timeout, how))
return dentry;
@ -398,12 +433,15 @@ static struct dentry *should_expire(struct dentry *dentry,
* (autofs-4.1).
*/
} else {
/* Path walk currently on this dentry? */
struct dentry *expired;
ino_count = atomic_read(&ino->count) + 1;
if (d_count(dentry) > ino_count)
return NULL;
/* Not a forced expire? */
if (!(how & AUTOFS_EXP_FORCED)) {
/* ref-walk currently on this dentry? */
ino_count = atomic_read(&ino->count) + 1;
if (d_count(dentry) > ino_count)
return NULL;
}
expired = autofs_check_leaves(mnt, dentry, timeout, how);
if (expired) {

8
include/uapi/linux/auto_fs.h
View File

@ -23,7 +23,7 @@
#define AUTOFS_MIN_PROTO_VERSION 3
#define AUTOFS_MAX_PROTO_VERSION 5
#define AUTOFS_PROTO_SUBVERSION 2
#define AUTOFS_PROTO_SUBVERSION 3
/*
* The wait_queue_token (autofs_wqt_t) is part of a structure which is passed
@ -90,8 +90,10 @@ enum {
/* autofs version 4 and later definitions */
/* Mask for expire behaviour */
#define AUTOFS_EXP_IMMEDIATE 1
#define AUTOFS_EXP_LEAVES 2
#define AUTOFS_EXP_NORMAL 0x00
#define AUTOFS_EXP_IMMEDIATE 0x01
#define AUTOFS_EXP_LEAVES 0x02
#define AUTOFS_EXP_FORCED 0x04
#define AUTOFS_TYPE_ANY 0U
#define AUTOFS_TYPE_INDIRECT 1U