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-rw-r--r--fs/fuse/dev.c88
-rw-r--r--fs/fuse/file.c2
-rw-r--r--fs/fuse/fuse_i.h2
-rw-r--r--include/linux/fuse.h13
4 files changed, 103 insertions, 2 deletions
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index 7eb80d33c4f..8e01c865586 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -1231,6 +1231,91 @@ err:
return err;
}
+static int fuse_notify_store(struct fuse_conn *fc, unsigned int size,
+ struct fuse_copy_state *cs)
+{
+ struct fuse_notify_store_out outarg;
+ struct inode *inode;
+ struct address_space *mapping;
+ u64 nodeid;
+ int err;
+ pgoff_t index;
+ unsigned int offset;
+ unsigned int num;
+ loff_t file_size;
+ loff_t end;
+
+ err = -EINVAL;
+ if (size < sizeof(outarg))
+ goto out_finish;
+
+ err = fuse_copy_one(cs, &outarg, sizeof(outarg));
+ if (err)
+ goto out_finish;
+
+ err = -EINVAL;
+ if (size - sizeof(outarg) != outarg.size)
+ goto out_finish;
+
+ nodeid = outarg.nodeid;
+
+ down_read(&fc->killsb);
+
+ err = -ENOENT;
+ if (!fc->sb)
+ goto out_up_killsb;
+
+ inode = ilookup5(fc->sb, nodeid, fuse_inode_eq, &nodeid);
+ if (!inode)
+ goto out_up_killsb;
+
+ mapping = inode->i_mapping;
+ index = outarg.offset >> PAGE_CACHE_SHIFT;
+ offset = outarg.offset & ~PAGE_CACHE_MASK;
+ file_size = i_size_read(inode);
+ end = outarg.offset + outarg.size;
+ if (end > file_size) {
+ file_size = end;
+ fuse_write_update_size(inode, file_size);
+ }
+
+ num = outarg.size;
+ while (num) {
+ struct page *page;
+ unsigned int this_num;
+
+ err = -ENOMEM;
+ page = find_or_create_page(mapping, index,
+ mapping_gfp_mask(mapping));
+ if (!page)
+ goto out_iput;
+
+ this_num = min_t(unsigned, num, PAGE_CACHE_SIZE - offset);
+ err = fuse_copy_page(cs, &page, offset, this_num, 0);
+ if (!err && offset == 0 && (num != 0 || file_size == end))
+ SetPageUptodate(page);
+ unlock_page(page);
+ page_cache_release(page);
+
+ if (err)
+ goto out_iput;
+
+ num -= this_num;
+ offset = 0;
+ index++;
+ }
+
+ err = 0;
+
+out_iput:
+ iput(inode);
+out_up_killsb:
+ up_read(&fc->killsb);
+out_finish:
+ fuse_copy_finish(cs);
+ return err;
+}
+
static int fuse_notify(struct fuse_conn *fc, enum fuse_notify_code code,
unsigned int size, struct fuse_copy_state *cs)
{
@@ -1244,6 +1329,9 @@ static int fuse_notify(struct fuse_conn *fc, enum fuse_notify_code code,
case FUSE_NOTIFY_INVAL_ENTRY:
return fuse_notify_inval_entry(fc, size, cs);
+ case FUSE_NOTIFY_STORE:
+ return fuse_notify_store(fc, size, cs);
+
default:
fuse_copy_finish(cs);
return -EINVAL;
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index ada0adeb3bb..147c1f71bdb 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -706,7 +706,7 @@ static int fuse_write_begin(struct file *file, struct address_space *mapping,
return 0;
}
-static void fuse_write_update_size(struct inode *inode, loff_t pos)
+void fuse_write_update_size(struct inode *inode, loff_t pos)
{
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_inode *fi = get_fuse_inode(inode);
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 8f309f04064..61267d8d527 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -748,4 +748,6 @@ long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
unsigned fuse_file_poll(struct file *file, poll_table *wait);
int fuse_dev_release(struct inode *inode, struct file *file);
+void fuse_write_update_size(struct inode *inode, loff_t pos);
+
#endif /* _FS_FUSE_I_H */
diff --git a/include/linux/fuse.h b/include/linux/fuse.h
index 88e0eb59691..a90bd49834a 100644
--- a/include/linux/fuse.h
+++ b/include/linux/fuse.h
@@ -37,6 +37,9 @@
*
* 7.14
* - add splice support to fuse device
+ *
+ * 7.15
+ * - add store notify
*/
#ifndef _LINUX_FUSE_H
@@ -68,7 +71,7 @@
#define FUSE_KERNEL_VERSION 7
/** Minor version number of this interface */
-#define FUSE_KERNEL_MINOR_VERSION 14
+#define FUSE_KERNEL_MINOR_VERSION 15
/** The node ID of the root inode */
#define FUSE_ROOT_ID 1
@@ -260,6 +263,7 @@ enum fuse_notify_code {
FUSE_NOTIFY_POLL = 1,
FUSE_NOTIFY_INVAL_INODE = 2,
FUSE_NOTIFY_INVAL_ENTRY = 3,
+ FUSE_NOTIFY_STORE = 4,
FUSE_NOTIFY_CODE_MAX,
};
@@ -568,4 +572,11 @@ struct fuse_notify_inval_entry_out {
__u32 padding;
};
+struct fuse_notify_store_out {
+ __u64 nodeid;
+ __u64 offset;
+ __u32 size;
+ __u32 padding;
+};
+
#endif /* _LINUX_FUSE_H */