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[safe/jmp/linux-2.6] / Documentation / power / userland-swsusp.txt

diff --git a/Documentation/power/userland-swsusp.txt b/Documentation/power/userland-swsusp.txt
index af52d53..81680f9 100644 (file)
--- a/Documentation/power/userland-swsusp.txt
+++ b/Documentation/power/userland-swsusp.txt
@@ -14,7 +14,7 @@ are going to develop your own suspend/resume utilities.
 
 The interface consists of a character device providing the open(),
 release(), read(), and write() operations as well as several ioctl()
-commands defined in kernel/power/power.h.  The major and minor
+commands defined in include/linux/suspend_ioctls.h .  The major and minor
 numbers of the device are, respectively, 10 and 231, and they can
 be read from /sys/class/misc/snapshot/dev.
 
@@ -24,6 +24,10 @@ assumed to be in the resume mode.  The device cannot be open for simultaneous
 reading and writing.  It is also impossible to have the device open more than
 once at a time.
 
+Even opening the device has side effects. Data structures are
+allocated, and PM_HIBERNATION_PREPARE / PM_RESTORE_PREPARE chains are
+called.
+
 The ioctl() commands recognized by the device are:
 
 SNAPSHOT_FREEZE - freeze user space processes (the current process is
@@ -70,10 +74,10 @@ SNAPSHOT_FREE_SWAP_PAGES - free all swap pages allocated by
 SNAPSHOT_SET_SWAP_AREA - set the resume partition and the offset (in <PAGE_SIZE>
        units) from the beginning of the partition at which the swap header is
        located (the last ioctl() argument should point to a struct
-       resume_swap_area, as defined in kernel/power/power.h, containing the
-       resume device specification and the offset); for swap partitions the
-       offset is always 0, but it is different from zero for swap files (see
-       Documentation/swsusp-and-swap-files.txt for details).
+       resume_swap_area, as defined in kernel/power/suspend_ioctls.h,
+       containing the resume device specification and the offset); for swap
+       partitions the offset is always 0, but it is different from zero for
+       swap files (see Documentation/swsusp-and-swap-files.txt for details).
 
 SNAPSHOT_PLATFORM_SUPPORT - enable/disable the hibernation platform support,
        depending on the argument value (enable, if the argument is nonzero)
@@ -109,7 +113,7 @@ unfreeze user space processes frozen by SNAPSHOT_UNFREEZE if they are
 still frozen when the device is being closed).
 
 Currently it is assumed that the userland utilities reading/writing the
-snapshot image from/to the kernel will use a swap parition, called the resume
+snapshot image from/to the kernel will use a swap partition, called the resume
 partition, or a swap file as storage space (if a swap file is used, the resume
 partition is the partition that holds this file).  However, this is not really
 required, as they can use, for example, a special (blank) suspend partition or