After validating the state of the file as not having holes, shared
extents, or active mappings try to commit the
XFS_DIFLAG2_IOMAP_IMMUTABLE flag to the on-disk inode metadata. If that
succeeds then allow the S_IOMAP_IMMUTABLE to be set on the vfs inode.
Cc: Jan Kara <jack@xxxxxxx>
Cc: Jeff Moyer <jmoyer@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Suggested-by: Dave Chinner <david@xxxxxxxxxxxxx>
Suggested-by: "Darrick J. Wong" <darrick.wong@xxxxxxxxxx>
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
---
fs/xfs/xfs_bmap_util.c | 38 +++++++++++++++++++++++++++++---------
1 file changed, 29 insertions(+), 9 deletions(-)
diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
index 888bae801961..26289d553760 100644
--- a/fs/xfs/xfs_bmap_util.c
+++ b/fs/xfs/xfs_bmap_util.c
@@ -1401,6 +1401,7 @@ xfs_seal_file_space(
struct xfs_mount *mp = ip->i_mount;
uint blksize;
int error;
+ struct xfs_trans *tp;
ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL));
@@ -1431,6 +1432,10 @@ xfs_seal_file_space(
if (error)
return error;
+ error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp);
+ if (error)
+ return error;
+
xfs_ilock(ip, XFS_ILOCK_EXCL);
/*
@@ -1439,7 +1444,7 @@ xfs_seal_file_space(
*/
error = -EINVAL;
if (len != i_size_read(inode))
- goto out_unlock;
+ goto out_cancel;
/*
* Allow DAX path to assume that the state of S_IOMAP_IMMUTABLE
@@ -1447,15 +1452,20 @@ xfs_seal_file_space(
*/
error = -EBUSY;
if (mapping_mapped(mapping))
- goto out_unlock;
+ goto out_cancel;
/* Did we race someone attempting to share extents? */
if (xfs_is_reflink_inode(ip))
- goto out_unlock;
+ goto out_cancel;
- error = 0;
+ xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
+ ip->i_d.di_flags2 |= XFS_DIFLAG2_IOMAP_IMMUTABLE;
inode->i_flags |= S_IOMAP_IMMUTABLE;
+ xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+ return xfs_trans_commit(tp);
+out_cancel:
+ xfs_trans_cancel(tp);
out_unlock:
xfs_iunlock(ip, XFS_ILOCK_EXCL);
@@ -1468,15 +1478,21 @@ xfs_unseal_file_space(
xfs_off_t offset,
xfs_off_t len)
{
+ struct xfs_mount *mp = ip->i_mount;
struct inode *inode = VFS_I(ip);
struct address_space *mapping = inode->i_mapping;
int error;
+ struct xfs_trans *tp;
ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL));
if (offset)
return -EINVAL;
+ error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp);
+ if (error)
+ return error;
+
xfs_ilock(ip, XFS_ILOCK_EXCL);
/*
* It does not make sense to unseal less than the full range of
@@ -1484,12 +1500,12 @@ xfs_unseal_file_space(
*/
error = -EINVAL;
if (len != i_size_read(inode))
- goto out_unlock;
+ goto out_cancel;
/* Are we already unsealed? */
error = 0;
if (!IS_IOMAP_IMMUTABLE(inode))
- goto out_unlock;
+ goto out_cancel;
/*
* Provide safety against one thread changing the policy of not
@@ -1498,12 +1514,16 @@ xfs_unseal_file_space(
*/
error = -EBUSY;
if (mapping_mapped(mapping))
- goto out_unlock;
+ goto out_cancel;
- error = 0;
+ xfs_trans_ijoin(tp, ip, 0);
+ ip->i_d.di_flags2 &= ~XFS_DIFLAG2_IOMAP_IMMUTABLE;
inode->i_flags &= ~S_IOMAP_IMMUTABLE;
+ xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+ return xfs_trans_commit(tp);
-out_unlock:
+out_cancel:
+ xfs_trans_cancel(tp);
xfs_iunlock(ip, XFS_ILOCK_EXCL);
return error;
--
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