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    Subject[RFC 08/15] PM / Hibernate: add user module_ops
    Date
    Add sws_module_ops into /dev/snapshot user interface, so far only with
    .storage_available. The structure will be shortly filled while converting
    it to ops.

    Also, when using this interface, switch to the ops on open/release.

    Signed-off-by: Jiri Slaby <jslaby@suse.cz>
    Cc: Nigel Cunningham <ncunningham@crca.org.au>
    Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
    ---
    kernel/power/user.c | 15 +++++++++++++++
    1 files changed, 15 insertions(+), 0 deletions(-)

    diff --git a/kernel/power/user.c b/kernel/power/user.c
    index 68a99c1..20bf34c 100644
    --- a/kernel/power/user.c
    +++ b/kernel/power/user.c
    @@ -61,10 +61,20 @@ static struct snapshot_data {
    char frozen;
    char ready;
    char platform_support;
    + struct sws_module_ops *prev_ops;
    } snapshot_state;

    atomic_t snapshot_device_available = ATOMIC_INIT(1);

    +static unsigned long user_storage_available(void)
    +{
    + return ~0UL; /* we have no idea, maybe we will fail later */
    +}
    +
    +struct sws_module_ops user_ops = {
    + .storage_available = user_storage_available,
    +};
    +
    static int snapshot_open(struct inode *inode, struct file *filp)
    {
    struct snapshot_data *data;
    @@ -115,6 +125,10 @@ static int snapshot_open(struct inode *inode, struct file *filp)
    }
    if (error)
    atomic_inc(&snapshot_device_available);
    + else {
    + data->prev_ops = sws_io_ops;
    + sws_io_ops = &user_ops;
    + }
    data->frozen = 0;
    data->ready = 0;
    data->platform_support = 0;
    @@ -139,6 +153,7 @@ static int snapshot_release(struct inode *inode, struct file *filp)
    thaw_processes();
    pm_notifier_call_chain(data->mode == O_WRONLY ?
    PM_POST_HIBERNATION : PM_POST_RESTORE);
    + sws_io_ops = data->prev_ops;
    atomic_inc(&snapshot_device_available);

    mutex_unlock(&pm_mutex);
    --
    1.7.0.2



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