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Btrfs: don't update atime on RO subvolumes

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Before the update_time inode operation was indroduced, it was
not possible to prevent updates of atime on RO subvolumes. VFS
was only able to check for RO on the mount, but did not know
anything about btrfs subvolumes.

btrfs_update_time does now check if the root is RO and skip
updating of times.

Signed-off-by: Alexander Block <ablock84@googlemail.com>
This commit is contained in:
Alexander Block
2012-06-15 09:49:33 +02:00
committed by Chris Mason
parent 063849eafd
commit 2bc5565286
2 changed files with 7 additions and 0 deletions
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5
fs/btrfs/inode.c
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@@ -4518,6 +4518,11 @@ int btrfs_dirty_inode(struct inode *inode)
static int btrfs_update_time(struct inode *inode, struct timespec *now,
int flags)
{
struct btrfs_root *root = BTRFS_I(inode)->root;
if (btrfs_root_readonly(root))
return -EROFS;
if (flags & S_VERSION)
inode_inc_iversion(inode);
if (flags & S_CTIME)