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-rw-r--r--fs/fat/file.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/fs/fat/file.c b/fs/fat/file.c
index c614175876e0..2a3bed967041 100644
--- a/fs/fat/file.c
+++ b/fs/fat/file.c
@@ -8,6 +8,7 @@
#include <linux/capability.h>
#include <linux/module.h>
+#include <linux/mount.h>
#include <linux/time.h>
#include <linux/msdos_fs.h>
#include <linux/smp_lock.h>
@@ -46,10 +47,9 @@ int fat_generic_ioctl(struct inode *inode, struct file *filp,
mutex_lock(&inode->i_mutex);
- if (IS_RDONLY(inode)) {
- err = -EROFS;
- goto up;
- }
+ err = mnt_want_write(filp->f_path.mnt);
+ if (err)
+ goto up_no_drop_write;
/*
* ATTR_VOLUME and ATTR_DIR cannot be changed; this also
@@ -105,7 +105,9 @@ int fat_generic_ioctl(struct inode *inode, struct file *filp,
MSDOS_I(inode)->i_attrs = attr & ATTR_UNUSED;
mark_inode_dirty(inode);
- up:
+up:
+ mnt_drop_write(filp->f_path.mnt);
+up_no_drop_write:
mutex_unlock(&inode->i_mutex);
return err;
}