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Subject[patch 20/22] fuse: make dirty stats available
From: Miklos Szeredi <mszeredi@suse.cz>

Make per-filesystem statistics about dirty and under-writeback pages
available through the fuse control filesystem.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
---
Index: linux/fs/fuse/control.c
===================================================================
--- linux.orig/fs/fuse/control.c 2007-02-27 14:40:54.000000000 +0100
+++ linux/fs/fuse/control.c 2007-02-27 14:41:13.000000000 +0100
@@ -41,24 +41,60 @@ static ssize_t fuse_conn_abort_write(str
return count;
}

-static ssize_t fuse_conn_waiting_read(struct file *file, char __user *buf,
- size_t len, loff_t *ppos)
+enum fusectl_type {
+ FUSECTL_WAITING,
+ FUSECTL_NR_DIRTY,
+ FUSECTL_NR_WRITEBACK
+};
+
+static ssize_t fuse_conn_read(struct file *file, char __user *buf,
+ size_t len, loff_t *ppos, enum fusectl_type sel)
{
char tmp[32];
size_t size;

if (!*ppos) {
+ long val = 0;
struct fuse_conn *fc = fuse_ctl_file_conn_get(file);
if (!fc)
return 0;

- file->private_data=(void *)(long)atomic_read(&fc->num_waiting);
+ switch (sel) {
+ case FUSECTL_WAITING:
+ val = atomic_read(&fc->num_waiting);
+ break;
+ case FUSECTL_NR_DIRTY:
+ val = atomic_long_read(&fc->bdi.nr_dirty);
+ break;
+ case FUSECTL_NR_WRITEBACK:
+ val = atomic_long_read(&fc->bdi.nr_writeback);
+ break;
+ }
+ file->private_data = (void *) val;
fuse_conn_put(fc);
}
size = sprintf(tmp, "%ld\n", (long)file->private_data);
return simple_read_from_buffer(buf, len, ppos, tmp, size);
}

+static ssize_t fuse_conn_waiting_read(struct file *file, char __user *buf,
+ size_t len, loff_t *ppos)
+{
+ return fuse_conn_read(file, buf, len, ppos, FUSECTL_WAITING);
+}
+
+static ssize_t fuse_conn_nr_dirty_read(struct file *file, char __user *buf,
+ size_t len, loff_t *ppos)
+{
+ return fuse_conn_read(file, buf, len, ppos, FUSECTL_NR_DIRTY);
+}
+
+static ssize_t fuse_conn_nr_writeback_read(struct file *file, char __user *buf,
+ size_t len, loff_t *ppos)
+{
+ return fuse_conn_read(file, buf, len, ppos, FUSECTL_NR_WRITEBACK);
+}
+
static const struct file_operations fuse_ctl_abort_ops = {
.open = nonseekable_open,
.write = fuse_conn_abort_write,
@@ -69,6 +105,16 @@ static const struct file_operations fuse
.read = fuse_conn_waiting_read,
};

+static const struct file_operations fuse_ctl_nr_dirty_ops = {
+ .open = nonseekable_open,
+ .read = fuse_conn_nr_dirty_read,
+};
+
+static const struct file_operations fuse_ctl_nr_writeback_ops = {
+ .open = nonseekable_open,
+ .read = fuse_conn_nr_writeback_read,
+};
+
static struct dentry *fuse_ctl_add_dentry(struct dentry *parent,
struct fuse_conn *fc,
const char *name,
@@ -127,7 +173,11 @@ int fuse_ctl_add_conn(struct fuse_conn *
if (!fuse_ctl_add_dentry(parent, fc, "waiting", S_IFREG | 0400, 1,
NULL, &fuse_ctl_waiting_ops) ||
!fuse_ctl_add_dentry(parent, fc, "abort", S_IFREG | 0200, 1,
- NULL, &fuse_ctl_abort_ops))
+ NULL, &fuse_ctl_abort_ops) ||
+ !fuse_ctl_add_dentry(parent, fc, "nr_dirty", S_IFREG | 0444, 1,
+ NULL, &fuse_ctl_nr_dirty_ops) ||
+ !fuse_ctl_add_dentry(parent, fc, "nr_writeback", S_IFREG | 0444, 1,
+ NULL, &fuse_ctl_nr_writeback_ops))
goto err;

return 0;
Index: linux/fs/fuse/fuse_i.h
===================================================================
--- linux.orig/fs/fuse/fuse_i.h 2007-02-27 14:41:11.000000000 +0100
+++ linux/fs/fuse/fuse_i.h 2007-02-27 14:41:13.000000000 +0100
@@ -30,7 +30,7 @@
#define FUSE_NAME_MAX 1024

/** Number of dentries for each connection in the control filesystem */
-#define FUSE_CTL_NUM_DENTRIES 3
+#define FUSE_CTL_NUM_DENTRIES 5

/** If the FUSE_DEFAULT_PERMISSIONS flag is given, the filesystem
module will check permissions based on the file mode. Otherwise no
--
-
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