[PATCH] ext2: discard block reservation on last writable file release
From: Chengguang Xu <hidden>
Date: 2021-01-02 10:19:33
Subsystem:
ext2 file system, filesystems (vfs and infrastructure), the rest · Maintainers:
Jan Kara, Alexander Viro, Christian Brauner, Linus Torvalds
Currently reserved blocks are discarded on every writable file release, it's not efficient for multiple writer case. Signed-off-by: Chengguang Xu <redacted> --- fs/ext2/file.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/ext2/file.c b/fs/ext2/file.c
index 96044f5dbc0e..9a19d8fe7ffd 100644
--- a/fs/ext2/file.c
+++ b/fs/ext2/file.c@@ -141,7 +141,7 @@ static int ext2_file_mmap(struct file *file, struct vm_area_struct *vma) */ static int ext2_release_file (struct inode * inode, struct file * filp) { - if (filp->f_mode & FMODE_WRITE) { + if (filp->f_mode & FMODE_WRITE && (atomic_read(&inode->i_writecount) == 1)) { mutex_lock(&EXT2_I(inode)->truncate_mutex); ext2_discard_reservation(inode); mutex_unlock(&EXT2_I(inode)->truncate_mutex);
--
2.18.4