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xfs: remove xfs_attri_remove_iter

Browse source 
xfs_attri_remove_iter is not used anymore, so remove it and all the
infrastructure it uses and is needed to drive it. THe
xfs_attr_refillstate() function now throws an unused warning, so
isolate the xfs_attr_fillstate()/xfs_attr_refillstate() code pair
with an #if 0 and a comment explaining why we want to keep this code
and restore the optimisation it provides in the near future.

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 4b9879b19c
commit 59782a236b
1 changed files with 139 additions and 279 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

418
fs/xfs/libxfs/xfs_attr.c
View file

@ -63,10 +63,6 @@ STATIC int xfs_attr_node_addname_find_attr(struct xfs_attr_item *attr);
STATIC int xfs_attr_node_remove_attr(struct xfs_attr_item *attr);
STATIC int xfs_attr_node_hasname(xfs_da_args_t *args,
struct xfs_da_state **state);
STATIC int xfs_attr_fillstate(xfs_da_state_t *state);
STATIC int xfs_attr_refillstate(xfs_da_state_t *state);
STATIC int xfs_attr_node_removename(struct xfs_da_args *args,
struct xfs_da_state *state);
int
xfs_inode_hasattr(
@ -99,6 +95,123 @@ xfs_attr_is_leaf(
return imap.br_startoff == 0 && imap.br_blockcount == 1;
}
/*
* XXX (dchinner): name path state saving and refilling is an optimisation to
* avoid needing to look up name entries after rolling transactions removing
* remote xattr blocks between the name entry lookup and name entry removal.
* This optimisation got sidelined when combining the set and remove state
* machines, but the code has been left in place because it is worthwhile to
* restore the optimisation once the combined state machine paths have settled.
*
* This comment is a public service announcement to remind Future Dave that he
* still needs to restore this code to working order.
*/
#if 0
/*
* Fill in the disk block numbers in the state structure for the buffers
* that are attached to the state structure.
* This is done so that we can quickly reattach ourselves to those buffers
* after some set of transaction commits have released these buffers.
*/
static int
xfs_attr_fillstate(xfs_da_state_t *state)
{
xfs_da_state_path_t *path;
xfs_da_state_blk_t *blk;
int level;
trace_xfs_attr_fillstate(state->args);
/*
* Roll down the "path" in the state structure, storing the on-disk
* block number for those buffers in the "path".
*/
path = &state->path;
ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
if (blk->bp) {
blk->disk_blkno = xfs_buf_daddr(blk->bp);
blk->bp = NULL;
} else {
blk->disk_blkno = 0;
}
}
/*
* Roll down the "altpath" in the state structure, storing the on-disk
* block number for those buffers in the "altpath".
*/
path = &state->altpath;
ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
if (blk->bp) {
blk->disk_blkno = xfs_buf_daddr(blk->bp);
blk->bp = NULL;
} else {
blk->disk_blkno = 0;
}
}
return 0;
}
/*
* Reattach the buffers to the state structure based on the disk block
* numbers stored in the state structure.
* This is done after some set of transaction commits have released those
* buffers from our grip.
*/
static int
xfs_attr_refillstate(xfs_da_state_t *state)
{
xfs_da_state_path_t *path;
xfs_da_state_blk_t *blk;
int level, error;
trace_xfs_attr_refillstate(state->args);
/*
* Roll down the "path" in the state structure, storing the on-disk
* block number for those buffers in the "path".
*/
path = &state->path;
ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
if (blk->disk_blkno) {
error = xfs_da3_node_read_mapped(state->args->trans,
state->args->dp, blk->disk_blkno,
&blk->bp, XFS_ATTR_FORK);
if (error)
return error;
} else {
blk->bp = NULL;
}
}
/*
* Roll down the "altpath" in the state structure, storing the on-disk
* block number for those buffers in the "altpath".
*/
path = &state->altpath;
ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
if (blk->disk_blkno) {
error = xfs_da3_node_read_mapped(state->args->trans,
state->args->dp, blk->disk_blkno,
&blk->bp, XFS_ATTR_FORK);
if (error)
return error;
} else {
blk->bp = NULL;
}
}
return 0;
}
#else
static int xfs_attr_fillstate(xfs_da_state_t *state) { return 0; }
#endif
/*========================================================================
* Overall external interface routines.
*========================================================================*/
@ -547,25 +660,16 @@ xfs_attr_leaf_remove_attr(
*/
static int
xfs_attr_leaf_shrink(
struct xfs_da_args *args,
struct xfs_da_state *state)
struct xfs_da_args *args)
{
struct xfs_inode *dp = args->dp;
int error, forkoff;
struct xfs_buf *bp;
int forkoff;
int error;
if (!xfs_attr_is_leaf(dp))
return 0;
/*
* Have to get rid of the copy of this dabuf in the state.
*/
if (state) {
ASSERT(state->path.active == 1);
ASSERT(state->path.blk[0].bp);
state->path.blk[0].bp = NULL;
}
error = xfs_attr3_leaf_read(args->trans, args->dp, 0, &bp);
if (error)
return error;
@ -708,7 +812,7 @@ xfs_attr_set_iter(
case XFS_DAS_NODE_REMOVE_ATTR:
error = xfs_attr_node_remove_attr(attr);
if (!error)
error = xfs_attr_leaf_shrink(args, NULL);
error = xfs_attr_leaf_shrink(args);
attr->xattri_dela_state = XFS_DAS_DONE;
break;
default:
@ -1379,6 +1483,24 @@ xfs_attr_node_try_addname(
return error;
}
static int
xfs_attr_node_removename(
struct xfs_da_args *args,
struct xfs_da_state *state)
{
struct xfs_da_state_blk *blk;
int retval;
/*
* Remove the name and update the hashvals in the tree.
*/
blk = &state->path.blk[state->path.active-1];
ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
retval = xfs_attr3_leaf_remove(blk->bp, args);
xfs_da3_fixhashpath(state, &state->path);
return retval;
}
static int
xfs_attr_node_remove_attr(
@ -1421,268 +1543,6 @@ xfs_attr_node_remove_attr(
return retval;
}
STATIC int
xfs_attr_node_removename(
struct xfs_da_args *args,
struct xfs_da_state *state)
{
struct xfs_da_state_blk *blk;
int retval;
/*
* Remove the name and update the hashvals in the tree.
*/
blk = &state->path.blk[state->path.active-1];
ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
retval = xfs_attr3_leaf_remove(blk->bp, args);
xfs_da3_fixhashpath(state, &state->path);
return retval;
}
/*
* Remove the attribute specified in @args.
*
* This will involve walking down the Btree, and may involve joining
* leaf nodes and even joining intermediate nodes up to and including
* the root node (a special case of an intermediate node).
*
* This routine is meant to function as either an in-line or delayed operation,
* and may return -EAGAIN when the transaction needs to be rolled. Calling
* functions will need to handle this, and call the function until a
* successful error code is returned.
*/
int
xfs_attr_remove_iter(
struct xfs_attr_item *attr)
{
struct xfs_da_args *args = attr->xattri_da_args;
struct xfs_da_state *state = attr->xattri_da_state;
int retval, error = 0;
struct xfs_inode *dp = args->dp;
trace_xfs_attr_node_removename(args);
switch (attr->xattri_dela_state) {
case XFS_DAS_UNINIT:
if (!xfs_inode_hasattr(dp))
return -ENOATTR;
/*
* Shortform or leaf formats don't require transaction rolls and
* thus state transitions. Call the right helper and return.
*/
if (dp->i_afp->if_format == XFS_DINODE_FMT_LOCAL)
return xfs_attr_sf_removename(args);
if (xfs_attr_is_leaf(dp))
return xfs_attr_leaf_removename(args);
/*
* Node format may require transaction rolls. Set up the
* state context and fall into the state machine.
*/
if (!attr->xattri_da_state) {
error = xfs_attr_node_removename_setup(attr);
if (error)
return error;
state = attr->xattri_da_state;
}
fallthrough;
case XFS_DAS_RMTBLK:
attr->xattri_dela_state = XFS_DAS_RMTBLK;
/*
* If there is an out-of-line value, de-allocate the blocks.
* This is done before we remove the attribute so that we don't
* overflow the maximum size of a transaction and/or hit a
* deadlock.
*/
if (args->rmtblkno > 0) {
/*
* May return -EAGAIN. Roll and repeat until all remote
* blocks are removed.
*/
error = xfs_attr_rmtval_remove(attr);
if (error == -EAGAIN) {
trace_xfs_attr_remove_iter_return(
attr->xattri_dela_state, args->dp);
return error;
} else if (error) {
goto out;
}
/*
* Refill the state structure with buffers (the prior
* calls released our buffers) and close out this
* transaction before proceeding.
*/
ASSERT(args->rmtblkno == 0);
error = xfs_attr_refillstate(state);
if (error)
goto out;
attr->xattri_dela_state = XFS_DAS_RM_NAME;
trace_xfs_attr_remove_iter_return(
attr->xattri_dela_state, args->dp);
return -EAGAIN;
}
fallthrough;
case XFS_DAS_RM_NAME:
/*
* If we came here fresh from a transaction roll, reattach all
* the buffers to the current transaction.
*/
if (attr->xattri_dela_state == XFS_DAS_RM_NAME) {
error = xfs_attr_refillstate(state);
if (error)
goto out;
}
retval = xfs_attr_node_removename(args, state);
/*
* Check to see if the tree needs to be collapsed. If so, roll
* the transacton and fall into the shrink state.
*/
if (retval && (state->path.active > 1)) {
error = xfs_da3_join(state);
if (error)
goto out;
attr->xattri_dela_state = XFS_DAS_RM_SHRINK;
trace_xfs_attr_remove_iter_return(
attr->xattri_dela_state, args->dp);
return -EAGAIN;
}
fallthrough;
case XFS_DAS_RM_SHRINK:
/*
* If the result is small enough, push it all into the inode.
* This is our final state so it's safe to return a dirty
* transaction.
*/
if (xfs_attr_is_leaf(dp))
error = xfs_attr_leaf_shrink(args, state);
ASSERT(error != -EAGAIN);
break;
default:
ASSERT(0);
error = -EINVAL;
goto out;
}
out:
if (state)
xfs_da_state_free(state);
return error;
}
/*
* Fill in the disk block numbers in the state structure for the buffers
* that are attached to the state structure.
* This is done so that we can quickly reattach ourselves to those buffers
* after some set of transaction commits have released these buffers.
*/
STATIC int
xfs_attr_fillstate(xfs_da_state_t *state)
{
xfs_da_state_path_t *path;
xfs_da_state_blk_t *blk;
int level;
trace_xfs_attr_fillstate(state->args);
/*
* Roll down the "path" in the state structure, storing the on-disk
* block number for those buffers in the "path".
*/
path = &state->path;
ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
if (blk->bp) {
blk->disk_blkno = xfs_buf_daddr(blk->bp);
blk->bp = NULL;
} else {
blk->disk_blkno = 0;
}
}
/*
* Roll down the "altpath" in the state structure, storing the on-disk
* block number for those buffers in the "altpath".
*/
path = &state->altpath;
ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
if (blk->bp) {
blk->disk_blkno = xfs_buf_daddr(blk->bp);
blk->bp = NULL;
} else {
blk->disk_blkno = 0;
}
}
return 0;
}
/*
* Reattach the buffers to the state structure based on the disk block
* numbers stored in the state structure.
* This is done after some set of transaction commits have released those
* buffers from our grip.
*/
STATIC int
xfs_attr_refillstate(xfs_da_state_t *state)
{
xfs_da_state_path_t *path;
xfs_da_state_blk_t *blk;
int level, error;
trace_xfs_attr_refillstate(state->args);
/*
* Roll down the "path" in the state structure, storing the on-disk
* block number for those buffers in the "path".
*/
path = &state->path;
ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
if (blk->disk_blkno) {
error = xfs_da3_node_read_mapped(state->args->trans,
state->args->dp, blk->disk_blkno,
&blk->bp, XFS_ATTR_FORK);
if (error)
return error;
} else {
blk->bp = NULL;
}
}
/*
* Roll down the "altpath" in the state structure, storing the on-disk
* block number for those buffers in the "altpath".
*/
path = &state->altpath;
ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
if (blk->disk_blkno) {
error = xfs_da3_node_read_mapped(state->args->trans,
state->args->dp, blk->disk_blkno,
&blk->bp, XFS_ATTR_FORK);
if (error)
return error;
} else {
blk->bp = NULL;
}
}
return 0;
}
/*
* Retrieve the attribute data from a node attribute list.
*