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Subject[PATCH 17/20] fuse,virtiofs: Maintain a list of busy elements
Date
This list will be used selecting fuse_dax_mapping to free when number of
free mappings drops below a threshold.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
---
fs/fuse/file.c | 22 ++++++++++++++++++++++
fs/fuse/fuse_i.h | 8 ++++++++
fs/fuse/inode.c | 4 ++++
3 files changed, 34 insertions(+)

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 619aff6b5f44..afabeb1acd50 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -215,6 +215,23 @@ static struct fuse_dax_mapping *alloc_dax_mapping(struct fuse_conn *fc)
return dmap;
}

+/* This assumes fc->lock is held */
+static void __dmap_remove_busy_list(struct fuse_conn *fc,
+ struct fuse_dax_mapping *dmap)
+{
+ list_del_init(&dmap->busy_list);
+ WARN_ON(fc->nr_busy_ranges == 0);
+ fc->nr_busy_ranges--;
+}
+
+static void dmap_remove_busy_list(struct fuse_conn *fc,
+ struct fuse_dax_mapping *dmap)
+{
+ spin_lock(&fc->lock);
+ __dmap_remove_busy_list(fc, dmap);
+ spin_unlock(&fc->lock);
+}
+
/* This assumes fc->lock is held */
static void __dmap_add_to_free_pool(struct fuse_conn *fc,
struct fuse_dax_mapping *dmap)
@@ -277,6 +294,10 @@ static int fuse_setup_one_mapping(struct inode *inode, loff_t offset,
/* Protected by fi->i_dmap_sem */
fuse_dax_interval_tree_insert(dmap, &fi->dmap_tree);
fi->nr_dmaps++;
+ spin_lock(&fc->lock);
+ list_add_tail(&dmap->busy_list, &fc->busy_ranges);
+ fc->nr_busy_ranges++;
+ spin_unlock(&fc->lock);
}
return 0;
}
@@ -346,6 +367,7 @@ static void dmap_reinit_add_to_free_pool(struct fuse_conn *fc,
pr_debug("fuse: freeing memory range start=0x%llx end=0x%llx "
"window_offset=0x%llx length=0x%llx\n", dmap->start,
dmap->end, dmap->window_offset, dmap->length);
+ __dmap_remove_busy_list(fc, dmap);
dmap->start = dmap->end = 0;
__dmap_add_to_free_pool(fc, dmap);
}
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 3fea84411401..de213a7e1b0e 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -85,6 +85,10 @@ struct fuse_dax_mapping {
/** End Position in file */
__u64 end;
__u64 __subtree_last;
+
+ /* Will connect in fc->busy_ranges to keep track busy memory */
+ struct list_head busy_list;
+
/** Position in DAX window */
u64 window_offset;

@@ -814,6 +818,10 @@ struct fuse_conn {
/** DAX device, non-NULL if DAX is supported */
struct dax_device *dax_dev;

+ /* List of memory ranges which are busy */
+ unsigned long nr_busy_ranges;
+ struct list_head busy_ranges;
+
/*
* DAX Window Free Ranges
*/
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index abc881e6acb0..d4770e7fb7eb 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -616,6 +616,8 @@ static void fuse_free_dax_mem_ranges(struct list_head *mem_list)
/* Free All allocated elements */
list_for_each_entry_safe(range, temp, mem_list, list) {
list_del(&range->list);
+ if (!list_empty(&range->busy_list))
+ list_del(&range->busy_list);
kfree(range);
}
}
@@ -660,6 +662,7 @@ static int fuse_dax_mem_range_init(struct fuse_conn *fc,
*/
range->window_offset = i * FUSE_DAX_MEM_RANGE_SZ;
range->length = FUSE_DAX_MEM_RANGE_SZ;
+ INIT_LIST_HEAD(&range->busy_list);
list_add_tail(&range->list, &mem_ranges);
}

@@ -707,6 +710,7 @@ void fuse_conn_init(struct fuse_conn *fc, struct user_namespace *user_ns,
fc->user_ns = get_user_ns(user_ns);
fc->max_pages = FUSE_DEFAULT_MAX_PAGES_PER_REQ;
INIT_LIST_HEAD(&fc->free_ranges);
+ INIT_LIST_HEAD(&fc->busy_ranges);
}
EXPORT_SYMBOL_GPL(fuse_conn_init);

--
2.20.1
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