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authorChuck Ebbert <cebbert@redhat.com>2011-02-16 18:11:53 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2011-02-16 19:48:13 -0500
commite51900f7d38cbcfb481d84567fd92540e7e1d23a (patch)
treef732388a0efab2967fddc0afd0f2200731e34d02 /fs
parenta2640111d5edb3f4e6dd6089c0dbddc7590110b4 (diff)
block: revert block_dev read-only check
This reverts commit 75f1dc0d076d ("block: check bdev_read_only() from blkdev_get()"). That commit added stricter checking to make sure devices that were being used read-only were actually opened in that mode. It turns out that the change breaks a bunch of kernel code that opens block devices. Affected systems include dm, md, and the loop device. Because strict checking for read-only opens of block devices was not done before this, the code that opens the devices was opening them read-write even if they were being used read-only. Auditing all that code will take time, and new userspace packages for dm, mdadm, etc. will also be required. Signed-off-by: Chuck Ebbert <cebbert@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/block_dev.c11
1 files changed, 5 insertions, 6 deletions
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 333a7bb4cb9c..4fb8a3431531 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1215,12 +1215,6 @@ int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder)
1215 1215
1216 res = __blkdev_get(bdev, mode, 0); 1216 res = __blkdev_get(bdev, mode, 0);
1217 1217
1218 /* __blkdev_get() may alter read only status, check it afterwards */
1219 if (!res && (mode & FMODE_WRITE) && bdev_read_only(bdev)) {
1220 __blkdev_put(bdev, mode, 0);
1221 res = -EACCES;
1222 }
1223
1224 if (whole) { 1218 if (whole) {
1225 /* finish claiming */ 1219 /* finish claiming */
1226 mutex_lock(&bdev->bd_mutex); 1220 mutex_lock(&bdev->bd_mutex);
@@ -1298,6 +1292,11 @@ struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
1298 if (err) 1292 if (err)
1299 return ERR_PTR(err); 1293 return ERR_PTR(err);
1300 1294
1295 if ((mode & FMODE_WRITE) && bdev_read_only(bdev)) {
1296 blkdev_put(bdev, mode);
1297 return ERR_PTR(-EACCES);
1298 }
1299
1301 return bdev; 1300 return bdev;
1302} 1301}
1303EXPORT_SYMBOL(blkdev_get_by_path); 1302EXPORT_SYMBOL(blkdev_get_by_path);