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SubjectRe: [RFC][PATCH] inotify 0.9.2
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On Sun, 2004-09-19 at 23:56 -0400, John McCutchan wrote:

> I would appreciate design review, code review and testing.

Hey, John!

Attached patch, against inotify 0.9.2, cleans up the inotify.h header
file a bit. The patch is a little noisy because I reformat some lines
for readability or coding style concerns, but there are a few important
changes:

- Use PATH_MAX, the actual maximum path length, not 256, for the
size of "filename" in "struct inotify_event"

- Separate with __KERNEL__ the kernel from the user API

- Instead of forward declaring the inode, superblock, and
dentry structures, include the appropriate header file

Thanks!

Robert Love

Clean up the inotify header

Signed-Off-By: Robert Love <rml@novell.com>

include/linux/inotify.h | 79 +++++++++++++++++++++++++++++-------------------
1 files changed, 48 insertions(+), 31 deletions(-)
--- linux-inotify/include/linux/inotify.h 2004-09-21 00:58:03.920388608 -0400
+++ linux/include/linux/inotify.h 2004-09-21 01:15:05.831034576 -0400
@@ -9,66 +9,83 @@
#ifndef _LINUX_INOTIFY_H
#define _LINUX_INOTIFY_H

-struct inode;
-struct dentry;
-struct super_block;
+#include <linux/limits.h>

+/*
+ * struct inotify_event - structure read from the inotify device for each event
+ *
+ * When you are watching a directory, you will receive the filename for events
+ * such as IN_CREATE, IN_DELETE, IN_OPEN, IN_CLOSE, and so on ...
+ *
+ * Note: When reading from the device you must provide a buffer that is a
+ * multiple of sizeof(struct inotify_event)
+ */
struct inotify_event {
int wd;
int mask;
- char filename[256];
- /* When you are watching a directory you will get the filenames
- * for events like IN_CREATE, IN_DELETE, IN_OPEN, IN_CLOSE, etc..
- */
+ char filename[PATH_MAX];
};
-/* When reading from the device you must provide a buffer
- * that is a multiple of the sizeof(inotify_event)
- */

+/* the following are legal, implemented events */
#define IN_ACCESS 0x00000001 /* File was accessed */
#define IN_MODIFY 0x00000002 /* File was modified */
#define IN_CREATE 0x00000004 /* File was created */
#define IN_DELETE 0x00000008 /* File was deleted */
#define IN_RENAME 0x00000010 /* File was renamed */
-#define IN_ATTRIB 0x00000020 /* File changed attributes */
-#define IN_MOVE 0x00000040 /* File was moved */
-#define IN_UNMOUNT 0x00000080 /* Device file was on, was unmounted */
+#define IN_UNMOUNT 0x00000080 /* Backing filesystem was unmounted */
#define IN_CLOSE 0x00000100 /* File was closed */
#define IN_OPEN 0x00000200 /* File was opened */
+
+/* the following are legal, but not yet implemented, events */
+#define IN_ATTRIB 0x00000020 /* File changed attributes */
+#define IN_MOVE 0x00000040 /* File was moved */
+
+/* special flags */
#define IN_IGNORED 0x00000400 /* File was ignored */
#define IN_ALL_EVENTS 0xffffffff /* All the events */

-/* ioctl */
-
-/* Fill this and pass it to INOTIFY_WATCH ioctl */
+/*
+ * struct inotify_watch_request - represents a watch request
+ *
+ * Pass to the inotify device via the INOTIFY_WATCH ioctl
+ */
struct inotify_watch_request {
- char *dirname; // directory name
- unsigned long mask; // event mask
+ char *dirname; /* directory name */
+ unsigned long mask; /* event mask */
};

-#define INOTIFY_IOCTL_MAGIC 'Q'
-#define INOTIFY_IOCTL_MAXNR 4
+#define INOTIFY_IOCTL_MAGIC 'Q'
+#define INOTIFY_IOCTL_MAXNR 4

#define INOTIFY_WATCH _IOR(INOTIFY_IOCTL_MAGIC, 1, struct inotify_watch_request)
#define INOTIFY_IGNORE _IOR(INOTIFY_IOCTL_MAGIC, 2, int)
#define INOTIFY_STATS _IOR(INOTIFY_IOCTL_MAGIC, 3, int)
#define INOTIFY_SETDEBUG _IOR(INOTIFY_IOCTL_MAGIC, 4, int)

-#define INOTIFY_DEBUG_NONE 0x00000000
-#define INOTIFY_DEBUG_ALLOC 0x00000001
-#define INOTIFY_DEBUG_EVENTS 0x00000002
-#define INOTIFY_DEBUG_INODE 0x00000004
-#define INOTIFY_DEBUG_ERRORS 0x00000008
-#define INOTIFY_DEBUG_FILEN 0x00000010
-#define INOTIFY_DEBUG_ALL 0xffffffff
+#define INOTIFY_DEBUG_NONE 0x00000000
+#define INOTIFY_DEBUG_ALLOC 0x00000001
+#define INOTIFY_DEBUG_EVENTS 0x00000002
+#define INOTIFY_DEBUG_INODE 0x00000004
+#define INOTIFY_DEBUG_ERRORS 0x00000008
+#define INOTIFY_DEBUG_FILEN 0x00000010
+#define INOTIFY_DEBUG_ALL 0xffffffff
+
+#ifdef __KERNEL__
+
+#include <linux/dcache.h>
+#include <linux/fs.h>

-/* Kernel API */
/* Adds events to all watchers on inode that are interested in mask */
-void inotify_inode_queue_event (struct inode *inode, unsigned long mask, const char *filename);
+void inotify_inode_queue_event (struct inode *inode, unsigned long mask,
+ const char *filename);
+
/* Same as above but uses dentry's inode */
-void inotify_dentry_parent_queue_event (struct dentry *dentry, unsigned long mask, const char *filename);
+void inotify_dentry_parent_queue_event (struct dentry *dentry,
+ unsigned long mask, const char *filename);
+
/* This will remove all watchers from all inodes on the superblock */
void inotify_super_block_umount (struct super_block *sb);

-#endif
+#endif /* __KERNEL __ */

+#endif /* _LINUX_INOTIFY_H */
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