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authorRafael J. Wysocki <rjw@sisk.pl>2006-12-06 20:34:15 -0800
committerLinus Torvalds <torvalds@woody.osdl.org>2006-12-07 08:39:27 -0800
commit37b2ba12df88f0e29f2d52aaf1ab22789377d5b5 (patch)
tree38a05add5793bb82be9afdb9fa81d48ccf70da1f /kernel/power
parentecbd0da1eced957e0cbb611b4a4cb5b0cf63ba31 (diff)
[PATCH] swsusp: add ioctl for swap files support
To be able to use swap files as suspend storage from the userland suspend tools we need an additional ioctl() that will allow us to provide the kernel with both the swap header's offset and the identification of the resume partition. The new ioctl() should be regarded as a replacement for the SNAPSHOT_SET_SWAP_FILE ioctl() that from now on will be considered as obsolete, but has to stay for backwards compatibility of the interface. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/power')
-rw-r--r--kernel/power/power.h14
-rw-r--r--kernel/power/user.c31
2 files changed, 44 insertions, 1 deletions
diff --git a/kernel/power/power.h b/kernel/power/power.h
index adaf7d4fbdaf..7dbfd9f67e1c 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -106,6 +106,16 @@ extern int snapshot_write_next(struct snapshot_handle *handle, size_t count);
extern int snapshot_image_loaded(struct snapshot_handle *handle);
extern void snapshot_free_unused_memory(struct snapshot_handle *handle);
+/*
+ * This structure is used to pass the values needed for the identification
+ * of the resume swap area from a user space to the kernel via the
+ * SNAPSHOT_SET_SWAP_AREA ioctl
+ */
+struct resume_swap_area {
+ loff_t offset;
+ u_int32_t dev;
+} __attribute__((packed));
+
#define SNAPSHOT_IOC_MAGIC '3'
#define SNAPSHOT_FREEZE _IO(SNAPSHOT_IOC_MAGIC, 1)
#define SNAPSHOT_UNFREEZE _IO(SNAPSHOT_IOC_MAGIC, 2)
@@ -119,7 +129,9 @@ extern void snapshot_free_unused_memory(struct snapshot_handle *handle);
#define SNAPSHOT_SET_SWAP_FILE _IOW(SNAPSHOT_IOC_MAGIC, 10, unsigned int)
#define SNAPSHOT_S2RAM _IO(SNAPSHOT_IOC_MAGIC, 11)
#define SNAPSHOT_PMOPS _IOW(SNAPSHOT_IOC_MAGIC, 12, unsigned int)
-#define SNAPSHOT_IOC_MAXNR 12
+#define SNAPSHOT_SET_SWAP_AREA _IOW(SNAPSHOT_IOC_MAGIC, 13, \
+ struct resume_swap_area)
+#define SNAPSHOT_IOC_MAXNR 13
#define PMOPS_PREPARE 1
#define PMOPS_ENTER 2
diff --git a/kernel/power/user.c b/kernel/power/user.c
index f0b7ef8bdd74..05c58a2c0dd4 100644
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -343,6 +343,37 @@ OutS3:
}
break;
+ case SNAPSHOT_SET_SWAP_AREA:
+ if (data->bitmap) {
+ error = -EPERM;
+ } else {
+ struct resume_swap_area swap_area;
+ dev_t swdev;
+
+ error = copy_from_user(&swap_area, (void __user *)arg,
+ sizeof(struct resume_swap_area));
+ if (error) {
+ error = -EFAULT;
+ break;
+ }
+
+ /*
+ * User space encodes device types as two-byte values,
+ * so we need to recode them
+ */
+ swdev = old_decode_dev(swap_area.dev);
+ if (swdev) {
+ offset = swap_area.offset;
+ data->swap = swap_type_of(swdev, offset);
+ if (data->swap < 0)
+ error = -ENODEV;
+ } else {
+ data->swap = -1;
+ error = -EINVAL;
+ }
+ }
+ break;
+
default:
error = -ENOTTY;