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Subject[patch 5/6] fsnotify: Use sequential fdinfo engine
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Andrey Vagin <avagin@openvz.org>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: James Bottomley <jbottomley@parallels.com>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Matthew Helsley <matt.helsley@gmail.com>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@onelan.co.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
---
fs/notify/fanotify/fanotify_user.c | 4 -
fs/notify/fdinfo.c | 121 +++++++++++++++++++++++++------------
fs/notify/fdinfo.h | 12 ---
fs/notify/inotify/inotify_user.c | 4 -
4 files changed, 94 insertions(+), 47 deletions(-)

Index: linux-2.6.git/fs/notify/fanotify/fanotify_user.c
===================================================================
--- linux-2.6.git.orig/fs/notify/fanotify/fanotify_user.c
+++ linux-2.6.git/fs/notify/fanotify/fanotify_user.c
@@ -432,7 +432,9 @@ static long fanotify_ioctl(struct file *
}

static const struct file_operations fanotify_fops = {
- .show_fdinfo = fanotify_show_fdinfo,
+#ifdef CONFIG_PROC_FS
+ .fdinfo_ops = &fanotify_fdinfo_ops,
+#endif
.poll = fanotify_poll,
.read = fanotify_read,
.write = fanotify_write,
Index: linux-2.6.git/fs/notify/fdinfo.c
===================================================================
--- linux-2.6.git.orig/fs/notify/fdinfo.c
+++ linux-2.6.git/fs/notify/fdinfo.c
@@ -16,25 +16,50 @@
#include "inotify/inotify.h"
#include "../fs/mount.h"

+#define seq_notify_group(m) ((struct file*)(m)->private)->private_data
+
#if defined(CONFIG_PROC_FS)

#if defined(CONFIG_INOTIFY_USER) || defined(CONFIG_FANOTIFY)

-static int show_fdinfo(struct seq_file *m, struct file *f,
- int (*show)(struct seq_file *m, struct fsnotify_mark *mark))
+static void *notify_start(struct seq_file *m, loff_t *pos,
+ void *(*__start)(struct seq_file *m, loff_t *pos,
+ struct fsnotify_group *group,
+ struct fsnotify_mark *mark))
{
- struct fsnotify_group *group = f->private_data;
+ struct fsnotify_group *group = seq_notify_group(m);
struct fsnotify_mark *mark;
- int ret = 0;
+ loff_t num = *pos;

mutex_lock(&group->mark_mutex);
list_for_each_entry(mark, &group->marks_list, g_list) {
- ret = show(m, mark);
- if (ret)
- break;
+ if (num-- == 0) {
+ if (__start)
+ return __start(m, pos, group, mark);
+ return mark;
+ }
}
+
+ return NULL;
+}
+
+static void notify_stop(struct seq_file *m, void *v)
+{
+ struct fsnotify_group *group = seq_notify_group(m);
mutex_unlock(&group->mark_mutex);
- return ret;
+}
+
+static void *notify_next(struct seq_file *m, void *p, loff_t *pos)
+{
+ struct fsnotify_group *group = seq_notify_group(m);
+ struct fsnotify_mark *mark = p;
+
+ if (!list_is_last(&mark->g_list, &group->marks_list))
+ mark = list_first_entry(&mark->g_list, struct fsnotify_mark, g_list);
+ else
+ mark = NULL;
+ ++*pos;
+ return mark;
}

#if defined(CONFIG_EXPORTFS)
@@ -75,9 +100,15 @@ static int show_mark_fhandle(struct seq_

#ifdef CONFIG_INOTIFY_USER

-static int inotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
+static void *inotify_start(struct seq_file *m, loff_t *pos)
+{
+ return notify_start(m, pos, NULL);
+}
+
+static int inotify_show(struct seq_file *m, void *v)
{
struct inotify_inode_mark *inode_mark;
+ struct fsnotify_mark *mark = v;
struct inode *inode;
int ret = 0;

@@ -100,17 +131,20 @@ static int inotify_fdinfo(struct seq_fil
return ret;
}

-int inotify_show_fdinfo(struct seq_file *m, struct file *f)
-{
- return show_fdinfo(m, f, inotify_fdinfo);
-}
+struct seq_operations inotify_fdinfo_ops = {
+ .start = inotify_start,
+ .next = notify_next,
+ .stop = notify_stop,
+ .show = inotify_show,
+};

#endif /* CONFIG_INOTIFY_USER */

#ifdef CONFIG_FANOTIFY

-static int fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
+static int fanotify_show(struct seq_file *m, void *v)
{
+ struct fsnotify_mark *mark = v;
unsigned int mflags = 0;
struct inode *inode;
int ret = 0;
@@ -143,35 +177,50 @@ out:
return ret;
}

-int fanotify_show_fdinfo(struct seq_file *m, struct file *f)
-{
- struct fsnotify_group *group = f->private_data;
- unsigned int flags = 0;
+static void *__fanotify_start(struct seq_file *m, loff_t *pos,
+ struct fsnotify_group *group,
+ struct fsnotify_mark *mark)
+{
+ if (*pos == 0) {
+ unsigned int flags = 0;
+
+ switch (group->priority) {
+ case FS_PRIO_0:
+ flags |= FAN_CLASS_NOTIF;
+ break;
+ case FS_PRIO_1:
+ flags |= FAN_CLASS_CONTENT;
+ break;
+ case FS_PRIO_2:
+ flags |= FAN_CLASS_PRE_CONTENT;
+ break;
+ }

- switch (group->priority) {
- case FS_PRIO_0:
- flags |= FAN_CLASS_NOTIF;
- break;
- case FS_PRIO_1:
- flags |= FAN_CLASS_CONTENT;
- break;
- case FS_PRIO_2:
- flags |= FAN_CLASS_PRE_CONTENT;
- break;
- }
+ if (group->max_events == UINT_MAX)
+ flags |= FAN_UNLIMITED_QUEUE;

- if (group->max_events == UINT_MAX)
- flags |= FAN_UNLIMITED_QUEUE;
+ if (group->fanotify_data.max_marks == UINT_MAX)
+ flags |= FAN_UNLIMITED_MARKS;

- if (group->fanotify_data.max_marks == UINT_MAX)
- flags |= FAN_UNLIMITED_MARKS;
+ seq_printf(m, "fanotify flags:%x event-flags:%x\n",
+ flags, group->fanotify_data.f_flags);
+ }

- seq_printf(m, "fanotify flags:%x event-flags:%x\n",
- flags, group->fanotify_data.f_flags);
+ return mark;
+}

- return show_fdinfo(m, f, fanotify_fdinfo);
+static void *fanotify_start(struct seq_file *m, loff_t *pos)
+{
+ return notify_start(m, pos, __fanotify_start);
}

+struct seq_operations fanotify_fdinfo_ops = {
+ .start = fanotify_start,
+ .next = notify_next,
+ .stop = notify_stop,
+ .show = fanotify_show,
+};
+
#endif /* CONFIG_FANOTIFY */

#endif /* CONFIG_INOTIFY_USER || CONFIG_FANOTIFY */
Index: linux-2.6.git/fs/notify/fdinfo.h
===================================================================
--- linux-2.6.git.orig/fs/notify/fdinfo.h
+++ linux-2.6.git/fs/notify/fdinfo.h
@@ -4,24 +4,18 @@
#include <linux/errno.h>
#include <linux/proc_fs.h>

-struct seq_file;
-struct file;
+struct seq_operations;

#ifdef CONFIG_PROC_FS

#ifdef CONFIG_INOTIFY_USER
-extern int inotify_show_fdinfo(struct seq_file *m, struct file *f);
+extern struct seq_operations inotify_fdinfo_ops;
#endif

#ifdef CONFIG_FANOTIFY
-extern int fanotify_show_fdinfo(struct seq_file *m, struct file *f);
+extern struct seq_operations fanotify_fdinfo_ops;
#endif

-#else /* CONFIG_PROC_FS */
-
-#define inotify_show_fdinfo NULL
-#define fanotify_show_fdinfo NULL
-
#endif /* CONFIG_PROC_FS */

#endif /* __FSNOTIFY_FDINFO_H__ */
Index: linux-2.6.git/fs/notify/inotify/inotify_user.c
===================================================================
--- linux-2.6.git.orig/fs/notify/inotify/inotify_user.c
+++ linux-2.6.git/fs/notify/inotify/inotify_user.c
@@ -327,7 +327,9 @@ static long inotify_ioctl(struct file *f
}

static const struct file_operations inotify_fops = {
- .show_fdinfo = inotify_show_fdinfo,
+#ifdef CONFIG_PROC_FS
+ .fdinfo_ops = &inotify_fdinfo_ops,
+#endif
.poll = inotify_poll,
.read = inotify_read,
.fasync = fsnotify_fasync,


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