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r: 28064
b: refs/heads/master
c: d3dcd4e
h: refs/heads/master
v: v3
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Patrick McHardy authored and David S. Miller committed Jun 20, 2006
1 parent af8f685 commit d9425bb
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2 changes: 1 addition & 1 deletion [refs]
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@@ -1,2 +1,2 @@
---
refs/heads/master: be883da7594b0a2a02074e683673ae0e522566a4
refs/heads/master: d3dcd4efe2ad1ad1865b2fe5c863c1ebd9482a84
61 changes: 0 additions & 61 deletions trunk/Documentation/arm/Sharp-LH/ADC-LH7-Touchscreen

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59 changes: 0 additions & 59 deletions trunk/Documentation/arm/Sharp-LH/LCDPanels

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130 changes: 6 additions & 124 deletions trunk/Documentation/filesystems/inotify.txt
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Expand Up @@ -69,135 +69,17 @@ Prototypes:
int inotify_rm_watch (int fd, __u32 mask);


(iii) Kernel Interface
(iii) Internal Kernel Implementation

Inotify's kernel API consists a set of functions for managing watches and an
event callback.

To use the kernel API, you must first initialize an inotify instance with a set
of inotify_operations. You are given an opaque inotify_handle, which you use
for any further calls to inotify.

struct inotify_handle *ih = inotify_init(my_event_handler);

You must provide a function for processing events and a function for destroying
the inotify watch.

void handle_event(struct inotify_watch *watch, u32 wd, u32 mask,
u32 cookie, const char *name, struct inode *inode)

watch - the pointer to the inotify_watch that triggered this call
wd - the watch descriptor
mask - describes the event that occurred
cookie - an identifier for synchronizing events
name - the dentry name for affected files in a directory-based event
inode - the affected inode in a directory-based event

void destroy_watch(struct inotify_watch *watch)

You may add watches by providing a pre-allocated and initialized inotify_watch
structure and specifying the inode to watch along with an inotify event mask.
You must pin the inode during the call. You will likely wish to embed the
inotify_watch structure in a structure of your own which contains other
information about the watch. Once you add an inotify watch, it is immediately
subject to removal depending on filesystem events. You must grab a reference if
you depend on the watch hanging around after the call.

inotify_init_watch(&my_watch->iwatch);
inotify_get_watch(&my_watch->iwatch); // optional
s32 wd = inotify_add_watch(ih, &my_watch->iwatch, inode, mask);
inotify_put_watch(&my_watch->iwatch); // optional

You may use the watch descriptor (wd) or the address of the inotify_watch for
other inotify operations. You must not directly read or manipulate data in the
inotify_watch. Additionally, you must not call inotify_add_watch() more than
once for a given inotify_watch structure, unless you have first called either
inotify_rm_watch() or inotify_rm_wd().

To determine if you have already registered a watch for a given inode, you may
call inotify_find_watch(), which gives you both the wd and the watch pointer for
the inotify_watch, or an error if the watch does not exist.

wd = inotify_find_watch(ih, inode, &watchp);

You may use container_of() on the watch pointer to access your own data
associated with a given watch. When an existing watch is found,
inotify_find_watch() bumps the refcount before releasing its locks. You must
put that reference with:

put_inotify_watch(watchp);

Call inotify_find_update_watch() to update the event mask for an existing watch.
inotify_find_update_watch() returns the wd of the updated watch, or an error if
the watch does not exist.

wd = inotify_find_update_watch(ih, inode, mask);

An existing watch may be removed by calling either inotify_rm_watch() or
inotify_rm_wd().

int ret = inotify_rm_watch(ih, &my_watch->iwatch);
int ret = inotify_rm_wd(ih, wd);

A watch may be removed while executing your event handler with the following:

inotify_remove_watch_locked(ih, iwatch);

Call inotify_destroy() to remove all watches from your inotify instance and
release it. If there are no outstanding references, inotify_destroy() will call
your destroy_watch op for each watch.

inotify_destroy(ih);

When inotify removes a watch, it sends an IN_IGNORED event to your callback.
You may use this event as an indication to free the watch memory. Note that
inotify may remove a watch due to filesystem events, as well as by your request.
If you use IN_ONESHOT, inotify will remove the watch after the first event, at
which point you may call the final inotify_put_watch.

(iv) Kernel Interface Prototypes

struct inotify_handle *inotify_init(struct inotify_operations *ops);

inotify_init_watch(struct inotify_watch *watch);

s32 inotify_add_watch(struct inotify_handle *ih,
struct inotify_watch *watch,
struct inode *inode, u32 mask);

s32 inotify_find_watch(struct inotify_handle *ih, struct inode *inode,
struct inotify_watch **watchp);

s32 inotify_find_update_watch(struct inotify_handle *ih,
struct inode *inode, u32 mask);

int inotify_rm_wd(struct inotify_handle *ih, u32 wd);

int inotify_rm_watch(struct inotify_handle *ih,
struct inotify_watch *watch);

void inotify_remove_watch_locked(struct inotify_handle *ih,
struct inotify_watch *watch);

void inotify_destroy(struct inotify_handle *ih);

void get_inotify_watch(struct inotify_watch *watch);
void put_inotify_watch(struct inotify_watch *watch);


(v) Internal Kernel Implementation

Each inotify instance is represented by an inotify_handle structure.
Inotify's userspace consumers also have an inotify_device which is
associated with the inotify_handle, and on which events are queued.
Each inotify instance is associated with an inotify_device structure.

Each watch is associated with an inotify_watch structure. Watches are chained
off of each associated inotify_handle and each associated inode.
off of each associated device and each associated inode.

See fs/inotify.c and fs/inotify_user.c for the locking and lifetime rules.
See fs/inotify.c for the locking and lifetime rules.


(vi) Rationale
(iv) Rationale

Q: What is the design decision behind not tying the watch to the open fd of
the watched object?
Expand Down Expand Up @@ -263,7 +145,7 @@ A: The poor user-space interface is the second biggest problem with dnotify.
file descriptor-based one that allows basic file I/O and poll/select.
Obtaining the fd and managing the watches could have been done either via a
device file or a family of new system calls. We decided to implement a
family of system calls because that is the preferred approach for new kernel
family of system calls because that is the preffered approach for new kernel
interfaces. The only real difference was whether we wanted to use open(2)
and ioctl(2) or a couple of new system calls. System calls beat ioctls.

6 changes: 3 additions & 3 deletions trunk/MAINTAINERS
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Expand Up @@ -1843,12 +1843,12 @@ S: linux-scsi@vger.kernel.org
W: http://megaraid.lsilogic.com
S: Maintained

MEMORY TECHNOLOGY DEVICES (MTD)
MEMORY TECHNOLOGY DEVICES
P: David Woodhouse
M: dwmw2@infradead.org
W: http://www.linux-mtd.infradead.org/
L: linux-mtd@lists.infradead.org
T: git git://git.infradead.org/mtd-2.6.git
T: git kernel.org:/pub/scm/linux/kernel/git/tglx/mtd-2.6.git
S: Maintained

MICROTEK X6 SCANNER
Expand Down Expand Up @@ -1895,7 +1895,7 @@ L: linux-kernel@vger.kernel.org
W: http://www.atnf.csiro.au/~rgooch/linux/kernel-patches.html
S: Maintained

MULTIMEDIA CARD (MMC) SUBSYSTEM
MULTIMEDIA CARD SUBSYSTEM
P: Russell King
M: rmk+mmc@arm.linux.org.uk
S: Maintained
Expand Down
5 changes: 0 additions & 5 deletions trunk/arch/arm/Kconfig
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Expand Up @@ -270,11 +270,6 @@ config ARCH_AT91RM9200
Say Y here if you intend to run this kernel on an Atmel
AT91RM9200-based board.

config ARCH_PNX4008
bool "Philips Nexperia PNX4008 Mobile"
help
This enables support for Philips PNX4008 mobile platform.

endchoice

source "arch/arm/mach-clps711x/Kconfig"
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1 change: 0 additions & 1 deletion trunk/arch/arm/Makefile
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Expand Up @@ -116,7 +116,6 @@ endif
machine-$(CONFIG_ARCH_REALVIEW) := realview
machine-$(CONFIG_ARCH_AT91RM9200) := at91rm9200
machine-$(CONFIG_ARCH_EP93XX) := ep93xx
machine-$(CONFIG_ARCH_PNX4008) := pnx4008

ifeq ($(CONFIG_ARCH_EBSA110),y)
# This is what happens if you forget the IOCS16 line.
Expand Down
4 changes: 2 additions & 2 deletions trunk/arch/arm/boot/compressed/head.S
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Expand Up @@ -605,8 +605,8 @@ proc_types:
b __armv4_mmu_cache_off
b __armv4_mmu_cache_flush

.word 0x0007b000 @ ARMv6
.word 0x0007f000
.word 0x00070000 @ ARMv6
.word 0x000f0000
b __armv4_mmu_cache_on
b __armv4_mmu_cache_off
b __armv6_mmu_cache_flush
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