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xfs: introduce attr remove initial states into xfs_attr_set_iter

Browse source 
We need to merge the add and remove code paths to enable safe
recovery of replace operations. Hoist the initial remove states from
xfs_attr_remove_iter into xfs_attr_set_iter. We will make use of
them in the next patches.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Allison Henderson<allison.henderson@oracle.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Dave Chinner 2022-05-12 15:12:56 +10:00 committed by Dave Chinner
parent 4e3d96a57a
commit e5d5596a2a
3 changed files with 84 additions and 62 deletions
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139
fs/xfs/libxfs/xfs_attr.c
View file

@ -450,6 +450,68 @@ xfs_attr_rmtval_alloc(
return error;
}
/*
* Mark an attribute entry INCOMPLETE and save pointers to the relevant buffers
* for later deletion of the entry.
*/
static int
xfs_attr_leaf_mark_incomplete(
struct xfs_da_args *args,
struct xfs_da_state *state)
{
int error;
/*
* Fill in disk block numbers in the state structure
* so that we can get the buffers back after we commit
* several transactions in the following calls.
*/
error = xfs_attr_fillstate(state);
if (error)
return error;
/*
* Mark the attribute as INCOMPLETE
*/
return xfs_attr3_leaf_setflag(args);
}
/*
* Initial setup for xfs_attr_node_removename. Make sure the attr is there and
* the blocks are valid. Attr keys with remote blocks will be marked
* incomplete.
*/
static
int xfs_attr_node_removename_setup(
struct xfs_attr_item *attr)
{
struct xfs_da_args *args = attr->xattri_da_args;
struct xfs_da_state **state = &attr->xattri_da_state;
int error;
error = xfs_attr_node_hasname(args, state);
if (error != -EEXIST)
goto out;
error = 0;
ASSERT((*state)->path.blk[(*state)->path.active - 1].bp != NULL);
ASSERT((*state)->path.blk[(*state)->path.active - 1].magic ==
XFS_ATTR_LEAF_MAGIC);
if (args->rmtblkno > 0) {
error = xfs_attr_leaf_mark_incomplete(args, *state);
if (error)
goto out;
error = xfs_attr_rmtval_invalidate(args);
}
out:
if (error)
xfs_da_state_free(*state);
return error;
}
/*
* Remove the original attr we have just replaced. This is dependent on the
* original lookup and insert placing the old attr in args->blkno/args->index
@ -549,6 +611,21 @@ xfs_attr_set_iter(
case XFS_DAS_NODE_ADD:
return xfs_attr_node_addname(attr);
case XFS_DAS_SF_REMOVE:
attr->xattri_dela_state = XFS_DAS_DONE;
return xfs_attr_sf_removename(args);
case XFS_DAS_LEAF_REMOVE:
attr->xattri_dela_state = XFS_DAS_DONE;
return xfs_attr_leaf_removename(args);
case XFS_DAS_NODE_REMOVE:
error = xfs_attr_node_removename_setup(attr);
if (error)
return error;
attr->xattri_dela_state = XFS_DAS_NODE_REMOVE_RMT;
if (args->rmtblkno == 0)
attr->xattri_dela_state++;
break;
case XFS_DAS_LEAF_SET_RMT:
case XFS_DAS_NODE_SET_RMT:
error = xfs_attr_rmtval_find_space(attr);
@ -1348,68 +1425,6 @@ xfs_attr_node_remove_attr(
}
/*
* Mark an attribute entry INCOMPLETE and save pointers to the relevant buffers
* for later deletion of the entry.
*/
STATIC int
xfs_attr_leaf_mark_incomplete(
struct xfs_da_args *args,
struct xfs_da_state *state)
{
int error;
/*
* Fill in disk block numbers in the state structure
* so that we can get the buffers back after we commit
* several transactions in the following calls.
*/
error = xfs_attr_fillstate(state);
if (error)
return error;
/*
* Mark the attribute as INCOMPLETE
*/
return xfs_attr3_leaf_setflag(args);
}
/*
* Initial setup for xfs_attr_node_removename. Make sure the attr is there and
* the blocks are valid. Attr keys with remote blocks will be marked
* incomplete.
*/
STATIC
int xfs_attr_node_removename_setup(
struct xfs_attr_item *attr)
{
struct xfs_da_args *args = attr->xattri_da_args;
struct xfs_da_state **state = &attr->xattri_da_state;
int error;
error = xfs_attr_node_hasname(args, state);
if (error != -EEXIST)
goto out;
error = 0;
ASSERT((*state)->path.blk[(*state)->path.active - 1].bp != NULL);
ASSERT((*state)->path.blk[(*state)->path.active - 1].magic ==
XFS_ATTR_LEAF_MAGIC);
if (args->rmtblkno > 0) {
error = xfs_attr_leaf_mark_incomplete(args, *state);
if (error)
goto out;
error = xfs_attr_rmtval_invalidate(args);
}
out:
if (error)
xfs_da_state_free(*state);
return error;
}
STATIC int
xfs_attr_node_removename(
struct xfs_da_args *args,

4
fs/xfs/libxfs/xfs_attr.h
View file

@ -451,6 +451,10 @@ enum xfs_delattr_state {
XFS_DAS_RM_NAME, /* Remove attr name */
XFS_DAS_RM_SHRINK, /* We are shrinking the tree */
XFS_DAS_SF_REMOVE, /* Initial shortform set iter state */
XFS_DAS_LEAF_REMOVE, /* Initial leaf form set iter state */
XFS_DAS_NODE_REMOVE, /* Initial node form set iter state */
/* Leaf state set/replace sequence */
XFS_DAS_LEAF_SET_RMT, /* set a remote xattr from a leaf */
XFS_DAS_LEAF_ALLOC_RMT, /* We are allocating remote blocks */

3
fs/xfs/xfs_trace.h
View file

@ -4136,6 +4136,9 @@ TRACE_DEFINE_ENUM(XFS_DAS_NODE_ADD);
TRACE_DEFINE_ENUM(XFS_DAS_RMTBLK);
TRACE_DEFINE_ENUM(XFS_DAS_RM_NAME);
TRACE_DEFINE_ENUM(XFS_DAS_RM_SHRINK);
TRACE_DEFINE_ENUM(XFS_DAS_SF_REMOVE);
TRACE_DEFINE_ENUM(XFS_DAS_LEAF_REMOVE);
TRACE_DEFINE_ENUM(XFS_DAS_NODE_REMOVE);
TRACE_DEFINE_ENUM(XFS_DAS_LEAF_SET_RMT);
TRACE_DEFINE_ENUM(XFS_DAS_LEAF_ALLOC_RMT);
TRACE_DEFINE_ENUM(XFS_DAS_LEAF_REPLACE);