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authorDave Chinner <david@fromorbit.com>2016-03-07 01:34:31 +0300
committerDave Chinner <david@fromorbit.com>2016-03-07 01:34:31 +0300
commit85a9f38d382bf06e995f2b1bf114596bac08d14d (patch)
treec6d4dd82d6ebe436203ef73e47a093b59bc3daad /fs/xfs/xfs_ioctl.c
parent3d93ec03648dfbe0f6772b906c8d27a4feaee75f (diff)
parent64485437357dfdc9752495b3f496adfc5c816c6f (diff)
downloadlinux-85a9f38d382bf06e995f2b1bf114596bac08d14d.tar.xz
Merge branch 'xfs-dax-fixes-4.6' into for-next
Diffstat (limited to 'fs/xfs/xfs_ioctl.c')
-rw-r--r--fs/xfs/xfs_ioctl.c105
1 files changed, 98 insertions, 7 deletions
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index 81d6d6218803..bcb6c19ce3ea 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -1060,23 +1060,86 @@ xfs_ioctl_setattr_xflags(
}
/*
+ * If we are changing DAX flags, we have to ensure the file is clean and any
+ * cached objects in the address space are invalidated and removed. This
+ * requires us to lock out other IO and page faults similar to a truncate
+ * operation. The locks need to be held until the transaction has been committed
+ * so that the cache invalidation is atomic with respect to the DAX flag
+ * manipulation.
+ */
+static int
+xfs_ioctl_setattr_dax_invalidate(
+ struct xfs_inode *ip,
+ struct fsxattr *fa,
+ int *join_flags)
+{
+ struct inode *inode = VFS_I(ip);
+ int error;
+
+ *join_flags = 0;
+
+ /*
+ * It is only valid to set the DAX flag on regular files and
+ * directories on filesystems where the block size is equal to the page
+ * size. On directories it serves as an inherit hint.
+ */
+ if (fa->fsx_xflags & FS_XFLAG_DAX) {
+ if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)))
+ return -EINVAL;
+ if (ip->i_mount->m_sb.sb_blocksize != PAGE_SIZE)
+ return -EINVAL;
+ }
+
+ /* If the DAX state is not changing, we have nothing to do here. */
+ if ((fa->fsx_xflags & FS_XFLAG_DAX) && IS_DAX(inode))
+ return 0;
+ if (!(fa->fsx_xflags & FS_XFLAG_DAX) && !IS_DAX(inode))
+ return 0;
+
+ /* lock, flush and invalidate mapping in preparation for flag change */
+ xfs_ilock(ip, XFS_MMAPLOCK_EXCL | XFS_IOLOCK_EXCL);
+ error = filemap_write_and_wait(inode->i_mapping);
+ if (error)
+ goto out_unlock;
+ error = invalidate_inode_pages2(inode->i_mapping);
+ if (error)
+ goto out_unlock;
+
+ *join_flags = XFS_MMAPLOCK_EXCL | XFS_IOLOCK_EXCL;
+ return 0;
+
+out_unlock:
+ xfs_iunlock(ip, XFS_MMAPLOCK_EXCL | XFS_IOLOCK_EXCL);
+ return error;
+
+}
+
+/*
* Set up the transaction structure for the setattr operation, checking that we
* have permission to do so. On success, return a clean transaction and the
* inode locked exclusively ready for further operation specific checks. On
* failure, return an error without modifying or locking the inode.
+ *
+ * The inode might already be IO locked on call. If this is the case, it is
+ * indicated in @join_flags and we take full responsibility for ensuring they
+ * are unlocked from now on. Hence if we have an error here, we still have to
+ * unlock them. Otherwise, once they are joined to the transaction, they will
+ * be unlocked on commit/cancel.
*/
static struct xfs_trans *
xfs_ioctl_setattr_get_trans(
- struct xfs_inode *ip)
+ struct xfs_inode *ip,
+ int join_flags)
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_trans *tp;
- int error;
+ int error = -EROFS;
if (mp->m_flags & XFS_MOUNT_RDONLY)
- return ERR_PTR(-EROFS);
+ goto out_unlock;
+ error = -EIO;
if (XFS_FORCED_SHUTDOWN(mp))
- return ERR_PTR(-EIO);
+ goto out_unlock;
tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_NOT_SIZE);
error = xfs_trans_reserve(tp, &M_RES(mp)->tr_ichange, 0, 0);
@@ -1084,7 +1147,8 @@ xfs_ioctl_setattr_get_trans(
goto out_cancel;
xfs_ilock(ip, XFS_ILOCK_EXCL);
- xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
+ xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL | join_flags);
+ join_flags = 0;
/*
* CAP_FOWNER overrides the following restrictions:
@@ -1104,6 +1168,9 @@ xfs_ioctl_setattr_get_trans(
out_cancel:
xfs_trans_cancel(tp);
+out_unlock:
+ if (join_flags)
+ xfs_iunlock(ip, join_flags);
return ERR_PTR(error);
}
@@ -1202,6 +1269,7 @@ xfs_ioctl_setattr(
struct xfs_dquot *pdqp = NULL;
struct xfs_dquot *olddquot = NULL;
int code;
+ int join_flags = 0;
trace_xfs_ioctl_setattr(ip);
@@ -1225,7 +1293,18 @@ xfs_ioctl_setattr(
return code;
}
- tp = xfs_ioctl_setattr_get_trans(ip);
+ /*
+ * Changing DAX config may require inode locking for mapping
+ * invalidation. These need to be held all the way to transaction commit
+ * or cancel time, so need to be passed through to
+ * xfs_ioctl_setattr_get_trans() so it can apply them to the join call
+ * appropriately.
+ */
+ code = xfs_ioctl_setattr_dax_invalidate(ip, fa, &join_flags);
+ if (code)
+ goto error_free_dquots;
+
+ tp = xfs_ioctl_setattr_get_trans(ip, join_flags);
if (IS_ERR(tp)) {
code = PTR_ERR(tp);
goto error_free_dquots;
@@ -1341,6 +1420,7 @@ xfs_ioc_setxflags(
struct xfs_trans *tp;
struct fsxattr fa;
unsigned int flags;
+ int join_flags = 0;
int error;
if (copy_from_user(&flags, arg, sizeof(flags)))
@@ -1357,7 +1437,18 @@ xfs_ioc_setxflags(
if (error)
return error;
- tp = xfs_ioctl_setattr_get_trans(ip);
+ /*
+ * Changing DAX config may require inode locking for mapping
+ * invalidation. These need to be held all the way to transaction commit
+ * or cancel time, so need to be passed through to
+ * xfs_ioctl_setattr_get_trans() so it can apply them to the join call
+ * appropriately.
+ */
+ error = xfs_ioctl_setattr_dax_invalidate(ip, &fa, &join_flags);
+ if (error)
+ goto out_drop_write;
+
+ tp = xfs_ioctl_setattr_get_trans(ip, join_flags);
if (IS_ERR(tp)) {
error = PTR_ERR(tp);
goto out_drop_write;