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| author | Dave Hansen <haveblue@us.ibm.com> | 2008-02-15 14:37:46 -0800 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2008-04-19 00:29:24 -0400 |
| commit | 42a74f206b914db13ee1f5ae932dcd91a77c8579 (patch) | |
| tree | 24e3dbe55edaacc750067ab9e01778255a6bff08 /fs/fat/file.c | |
| parent | 20ddee2c75339cc095f6191c3115f81da8955e96 (diff) | |
| download | linux-42a74f206b914db13ee1f5ae932dcd91a77c8579.tar.gz linux-42a74f206b914db13ee1f5ae932dcd91a77c8579.tar.bz2 linux-42a74f206b914db13ee1f5ae932dcd91a77c8579.zip | |
[PATCH] r/o bind mounts: elevate write count for ioctls()
Some ioctl()s can cause writes to the filesystem. Take these, and make them
use mnt_want/drop_write() instead.
[AV: updated]
Acked-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/fat/file.c')
| -rw-r--r-- | fs/fat/file.c | 12 |
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; } |