From: David Gibson Date: Tue, 22 Nov 2005 05:32:24 +0000 (-0800) Subject: [PATCH] Fix hugetlbfs_statfs() reporting of block limits X-Git-Tag: firefly_0821_release~39845 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=74a8a65c526187fe636a6a2abcb7d9ebc5c753ab;p=firefly-linux-kernel-4.4.55.git [PATCH] Fix hugetlbfs_statfs() reporting of block limits Currently, if a hugetlbfs is mounted without limits (the default), statfs() will return -1 for max/free/used blocks. This does not appear to be in line with normal convention: simple_statfs() and shmem_statfs() both return 0 in similar cases. Worse, it confuses the translation logic in put_compat_statfs(), causing it to return -EOVERFLOW on such a mount. This patch alters hugetlbfs_statfs() to return 0 for max/free/used blocks on a mount without limits. Note that we need the test in the patch below, rather than just using 0 in the sbinfo structure, because the -1 marked in the free blocks field is used internally to tell the Signed-off-by: David Gibson Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c index 64983ab55586..8c1cef3bb677 100644 --- a/fs/hugetlbfs/inode.c +++ b/fs/hugetlbfs/inode.c @@ -512,10 +512,14 @@ static int hugetlbfs_statfs(struct super_block *sb, struct kstatfs *buf) buf->f_bsize = HPAGE_SIZE; if (sbinfo) { spin_lock(&sbinfo->stat_lock); - buf->f_blocks = sbinfo->max_blocks; - buf->f_bavail = buf->f_bfree = sbinfo->free_blocks; - buf->f_files = sbinfo->max_inodes; - buf->f_ffree = sbinfo->free_inodes; + /* If no limits set, just report 0 for max/free/used + * blocks, like simple_statfs() */ + if (sbinfo->max_blocks >= 0) { + buf->f_blocks = sbinfo->max_blocks; + buf->f_bavail = buf->f_bfree = sbinfo->free_blocks; + buf->f_files = sbinfo->max_inodes; + buf->f_ffree = sbinfo->free_inodes; + } spin_unlock(&sbinfo->stat_lock); } buf->f_namelen = NAME_MAX;