[PATCH] fuse: set limit size

* [PATCH] fuse: set limit size
@ 2021-06-15  6:41 jzp0409
  2021-06-18  7:10 ` Miklos Szeredi
  0 siblings, 1 reply; 3+ messages in thread
From: jzp0409 @ 2021-06-15  6:41 UTC (permalink / raw)
  To: miklos; +Cc: linux-fsdevel, edison.jiang

From: "edison.jiang" <jiangzhipeng@yulong.com>

Android-R /sdcard mount FUSE filesystem type,
use "dd" command to filli up /sdcard dir,
Android will not boot normal,
becase this system need at least 128M userspace.

Test: open adb port,
      adb shell "dd if=dev/zero of=sdcard/ae bs=1024000 count=xxx"

Result: if not limit size,Android system  can not boot normal.

Signed-off-by: edison.jiang <jiangzhipeng@yulong.com>
---
 fs/fuse/inode.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index b0e18b4..f4e54505 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -477,6 +477,21 @@ static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr
 	stbuf->f_files   = attr->files;
 	stbuf->f_ffree   = attr->ffree;
 	stbuf->f_namelen = attr->namelen;
+#ifdef LIMIT_SDCARD_SIZE
+	u32 data_free_size_th = 128*1024*1024;
+
+	stbuf->f_blocks -= (u32)data_free_size_th/attr->bsize;
+
+	if (stbuf->f_bfree < ((u32)data_free_size_th/attr->bsize))
+		stbuf->f_bfree = 0;
+	else
+		stbuf->f_bfree -= (u32)data_free_size_th/attr->bsize;
+
+	if (stbuf->f_bavail < ((u32)data_free_size_th/attr->bsize))
+		stbuf->f_bavail = 0;
+	else
+		stbuf->f_bavail -= (u32)data_free_size_th/attr->bsize;
+#endif
 	/* fsid is left zero */
 }
 
-- 
1.9.1



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