Re: [PATCH v4 04/17] xfs: Add xfs_dabuf defines

Darrick J. Wong
2019-11-08T19:19:35Z

On Wed, Nov 06, 2019 at 06:27:48PM -0700, Allison Collins wrote:
> This patch adds two new defines XFS_DABUF_MAP_NOMAPPING and
> XFS_DABUF_MAP_HOLE_OK. This helps to clean up hard numbers and
> makes the code easier to read
>
> Signed-off-by: Allison Collins <allison.henderson@oracle.com>
> ---
> fs/xfs/libxfs/xfs_attr.c | 14 +++++++-----
> fs/xfs/libxfs/xfs_attr_leaf.c | 23 +++++++++++--------
> fs/xfs/libxfs/xfs_attr_leaf.h | 3 +++
> fs/xfs/libxfs/xfs_da_btree.c | 50 ++++++++++++++++++++++++++++--------------
> fs/xfs/libxfs/xfs_dir2_block.c | 6 +++--
> fs/xfs/libxfs/xfs_dir2_data.c | 3 ++-
> fs/xfs/libxfs/xfs_dir2_leaf.c | 9 +++++---
> fs/xfs/libxfs/xfs_dir2_node.c | 10 +++++----
> fs/xfs/scrub/dabtree.c | 6 ++---
> fs/xfs/scrub/dir.c | 4 +++-
> fs/xfs/xfs_attr_inactive.c | 6 +++--
> fs/xfs/xfs_attr_list.c | 16 +++++++++-----
> 12 files changed, 97 insertions(+), 53 deletions(-)

<snip>

> diff --git a/fs/xfs/libxfs/xfs_attr_leaf.h b/fs/xfs/libxfs/xfs_attr_leaf.h
> index bb08800..017480e 100644
> --- a/fs/xfs/libxfs/xfs_attr_leaf.h
> +++ b/fs/xfs/libxfs/xfs_attr_leaf.h
> @@ -16,6 +16,9 @@ struct xfs_da_state_blk;
> struct xfs_inode;
> struct xfs_trans;
>
> +#define XFS_DABUF_MAP_NOMAPPING (-1) /* Caller doesn't have a mapping. */
> +#define XFS_DABUF_MAP_HOLE_OK (-2) /* don't complain if we land in a hole. */

These are parameters to xfs_da_{get,read,reada}_buf, please put them
next to the declarations for those functions.

Also they probably ought to be explicitly cast to xfs_daddr_t, e.g.

/* Force a fresh lookup for the dir/attr mapping. */
#define XFS_DABUF_MAP_NOMAPPING ((xfs_daddr_t)-1)

/* Don't complain if we land in a hole. */
#define XFS_DABUF_MAP_HOLE_OK ((xfs_daddr_t)-2)

> +
> /*
> * Used to keep a list of "remote value" extents when unlinking an inode.
> */

<snip>

> diff --git a/fs/xfs/libxfs/xfs_dir2_block.c b/fs/xfs/libxfs/xfs_dir2_block.c
> index 8dedc30..6bc7651 100644
> --- a/fs/xfs/libxfs/xfs_dir2_block.c
> +++ b/fs/xfs/libxfs/xfs_dir2_block.c
> @@ -20,6 +20,7 @@
> #include "xfs_error.h"
> #include "xfs_trace.h"
> #include "xfs_log.h"
> +#include "xfs_attr_leaf.h"
>
> /*
> * Local function prototypes.
> @@ -123,8 +124,9 @@ xfs_dir3_block_read(
> struct xfs_mount *mp = dp->i_mount;
> int err;
>
> - err = xfs_da_read_buf(tp, dp, mp->m_dir_geo->datablk, -1, bpp,
> - XFS_DATA_FORK, &xfs_dir3_block_buf_ops);
> + err = xfs_da_read_buf(tp, dp, mp->m_dir_geo->datablk,
> + XFS_DABUF_MAP_NOMAPPING, bpp, XFS_DATA_FORK,
> + &xfs_dir3_block_buf_ops);
> if (!err && tp && *bpp)
> xfs_trans_buf_set_type(tp, *bpp, XFS_BLFT_DIR_BLOCK_BUF);
> return err;

I think this misses the xfs_dir3_data_read call in
xfs_dir2_leaf_to_block?

> diff --git a/fs/xfs/libxfs/xfs_dir2_data.c b/fs/xfs/libxfs/xfs_dir2_data.c
> index 2c79be4..a4188de 100644
> --- a/fs/xfs/libxfs/xfs_dir2_data.c
> +++ b/fs/xfs/libxfs/xfs_dir2_data.c
> @@ -17,6 +17,7 @@
> #include "xfs_trans.h"
> #include "xfs_buf_item.h"
> #include "xfs_log.h"
> +#include "xfs_attr_leaf.h"
>
> static xfs_failaddr_t xfs_dir2_data_freefind_verify(
> struct xfs_dir2_data_hdr *hdr, struct xfs_dir2_data_free *bf,
> @@ -653,7 +654,7 @@ xfs_dir3_data_init(
> * Get the buffer set up for the block.
> */
> error = xfs_da_get_buf(tp, dp, xfs_dir2_db_to_da(args->geo, blkno),
> - -1, &bp, XFS_DATA_FORK);
> + XFS_DABUF_MAP_NOMAPPING, &bp, XFS_DATA_FORK);
> if (error)
> return error;
> bp->b_ops = &xfs_dir3_data_buf_ops;
> diff --git a/fs/xfs/libxfs/xfs_dir2_leaf.c b/fs/xfs/libxfs/xfs_dir2_leaf.c
> index b7046e2..a2cba6bd 100644
> --- a/fs/xfs/libxfs/xfs_dir2_leaf.c
> +++ b/fs/xfs/libxfs/xfs_dir2_leaf.c
> @@ -19,6 +19,7 @@
> #include "xfs_trace.h"
> #include "xfs_trans.h"
> #include "xfs_buf_item.h"
> +#include "xfs_attr_leaf.h"
>
> /*
> * Local function declarations.
> @@ -311,7 +312,7 @@ xfs_dir3_leaf_get_buf(
> bno < xfs_dir2_byte_to_db(args->geo, XFS_DIR2_FREE_OFFSET));
>
> error = xfs_da_get_buf(tp, dp, xfs_dir2_db_to_da(args->geo, bno),
> - -1, &bp, XFS_DATA_FORK);
> + XFS_DABUF_MAP_NOMAPPING, &bp, XFS_DATA_FORK);
> if (error)
> return error;
>
> @@ -594,7 +595,8 @@ xfs_dir2_leaf_addname(
>
> trace_xfs_dir2_leaf_addname(args);
>
> - error = xfs_dir3_leaf_read(tp, dp, args->geo->leafblk, -1, &lbp);
> + error = xfs_dir3_leaf_read(tp, dp, args->geo->leafblk,
> + XFS_DABUF_MAP_NOMAPPING, &lbp);
> if (error)
> return error;
>

I think there are some missing conversions for xfs_dir3_data_read calls
in xfs_dir2_leaf_addname...

> @@ -1189,7 +1191,8 @@ xfs_dir2_leaf_lookup_int(
> tp = args->trans;
> mp = dp->i_mount;
>
> - error = xfs_dir3_leaf_read(tp, dp, args->geo->leafblk, -1, &lbp);
> + error = xfs_dir3_leaf_read(tp, dp, args->geo->leafblk,
> + XFS_DABUF_MAP_NOMAPPING, &lbp);
> if (error)
> return error;
>

...and two more dir3_leaf_read calls further down in this function...

...and one more in xfs_dir2_leaf_trim_data...

> diff --git a/fs/xfs/libxfs/xfs_dir2_node.c b/fs/xfs/libxfs/xfs_dir2_node.c
> index 8bbd742..0a803e4 100644
> --- a/fs/xfs/libxfs/xfs_dir2_node.c
> +++ b/fs/xfs/libxfs/xfs_dir2_node.c
> @@ -20,6 +20,7 @@
> #include "xfs_trans.h"
> #include "xfs_buf_item.h"
> #include "xfs_log.h"
> +#include "xfs_attr_leaf.h"
>
> /*
> * Function declarations.
> @@ -227,7 +228,7 @@ xfs_dir2_free_read(
> xfs_dablk_t fbno,
> struct xfs_buf **bpp)
> {
> - return __xfs_dir3_free_read(tp, dp, fbno, -1, bpp);
> + return __xfs_dir3_free_read(tp, dp, fbno, XFS_DABUF_MAP_NOMAPPING, bpp);
> }
>
> static int
> @@ -237,7 +238,7 @@ xfs_dir2_free_try_read(
> xfs_dablk_t fbno,
> struct xfs_buf **bpp)
> {
> - return __xfs_dir3_free_read(tp, dp, fbno, -2, bpp);
> + return __xfs_dir3_free_read(tp, dp, fbno, XFS_DABUF_MAP_HOLE_OK, bpp);
> }
>
> static int
> @@ -254,7 +255,7 @@ xfs_dir3_free_get_buf(
> struct xfs_dir3_icfree_hdr hdr;
>
> error = xfs_da_get_buf(tp, dp, xfs_dir2_db_to_da(args->geo, fbno),
> - -1, &bp, XFS_DATA_FORK);
> + XFS_DABUF_MAP_NOMAPPING, &bp, XFS_DATA_FORK);
> if (error)
> return error;
>

...there's also a missing call in xfs_dir2_leafn_lookup_for_entry...

> @@ -1495,7 +1496,8 @@ xfs_dir2_leafn_toosmall(
> * Read the sibling leaf block.
> */
> error = xfs_dir3_leafn_read(state->args->trans, dp,
> - blkno, -1, &bp);
> + blkno, XFS_DABUF_MAP_NOMAPPING,
> + &bp);
> if (error)
> return error;
>

...and another one in xfs_dir2_node_addname_int.

> diff --git a/fs/xfs/scrub/dabtree.c b/fs/xfs/scrub/dabtree.c
> index 77ff9f9..353455c 100644
> --- a/fs/xfs/scrub/dabtree.c
> +++ b/fs/xfs/scrub/dabtree.c
> @@ -355,9 +355,9 @@ xchk_da_btree_block(
> goto out_nobuf;
>
> /* Read the buffer. */
> - error = xfs_da_read_buf(dargs->trans, dargs->dp, blk->blkno, -2,
> - &blk->bp, dargs->whichfork,
> - &xchk_da_btree_buf_ops);
> + error = xfs_da_read_buf(dargs->trans, dargs->dp, blk->blkno,
> + XFS_DABUF_MAP_HOLE_OK, &blk->bp,
> + dargs->whichfork, &xchk_da_btree_buf_ops);
> if (!xchk_da_process_error(ds, level, &error))
> goto out_nobuf;
> if (blk->bp)
> diff --git a/fs/xfs/scrub/dir.c b/fs/xfs/scrub/dir.c
> index 1e2e117..eb0fa0f 100644
> --- a/fs/xfs/scrub/dir.c
> +++ b/fs/xfs/scrub/dir.c
> @@ -18,6 +18,7 @@
> #include "scrub/scrub.h"
> #include "scrub/common.h"
> #include "scrub/dabtree.h"
> +#include "xfs_attr_leaf.h"
>
> /* Set us up to scrub directories. */
> int

I also noticed missing conversions for xfs_dir3_data_read in
xchk_dir_rec, xchk_directory_data_bestfree,
xchk_directory_leaf1_bestfree, and xchk_directory_free_bestfree.

> @@ -492,7 +493,8 @@ xchk_directory_leaf1_bestfree(
> int error;
>
> /* Read the free space block. */
> - error = xfs_dir3_leaf_read(sc->tp, sc->ip, lblk, -1, &bp);
> + error = xfs_dir3_leaf_read(sc->tp, sc->ip, lblk,
> + XFS_DABUF_MAP_NOMAPPING, &bp);
> if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, lblk, &error))
> goto out;
> xchk_buffer_recheck(sc, bp);

There's also a missing xfs_dir3_data_readahead conversion in
xchk_parent_count_parent_dentries in fs/xfs/scrub/parent.c.

> diff --git a/fs/xfs/xfs_attr_inactive.c b/fs/xfs/xfs_attr_inactive.c
> index f83f11d..9c22915 100644
> --- a/fs/xfs/xfs_attr_inactive.c
> +++ b/fs/xfs/xfs_attr_inactive.c
> @@ -235,7 +235,8 @@ xfs_attr3_node_inactive(
> * traversal of the tree so we may deal with many blocks
> * before we come back to this one.
> */
> - error = xfs_da3_node_read(*trans, dp, child_fsb, -1, &child_bp,
> + error = xfs_da3_node_read(*trans, dp, child_fsb,
> + XFS_DABUF_MAP_NOMAPPING, &child_bp,
> XFS_ATTR_FORK);
> if (error)
> return error;
> @@ -321,7 +322,8 @@ xfs_attr3_root_inactive(
> * the extents in reverse order the extent containing
> * block 0 must still be there.
> */
> - error = xfs_da3_node_read(*trans, dp, 0, -1, &bp, XFS_ATTR_FORK);
> + error = xfs_da3_node_read(*trans, dp, 0, XFS_DABUF_MAP_NOMAPPING, &bp,
> + XFS_ATTR_FORK);
> if (error)
> return error;
> blkno = bp->b_bn;
> diff --git a/fs/xfs/xfs_attr_list.c b/fs/xfs/xfs_attr_list.c
> index c02f22d..fab416c 100644
> --- a/fs/xfs/xfs_attr_list.c
> +++ b/fs/xfs/xfs_attr_list.c
> @@ -224,8 +224,9 @@ xfs_attr_node_list_lookup(
> ASSERT(*pbp == NULL);
> cursor->blkno = 0;
> for (;;) {
> - error = xfs_da3_node_read(tp, dp, cursor->blkno, -1, &bp,
> - XFS_ATTR_FORK);
> + error = xfs_da3_node_read(tp, dp, cursor->blkno,
> + XFS_DABUF_MAP_NOMAPPING, &bp,
> + XFS_ATTR_FORK);
> if (error)
> return error;
> node = bp->b_addr;
> @@ -309,8 +310,9 @@ xfs_attr_node_list(
> */
> bp = NULL;
> if (cursor->blkno > 0) {
> - error = xfs_da3_node_read(context->tp, dp, cursor->blkno, -1,
> - &bp, XFS_ATTR_FORK);
> + error = xfs_da3_node_read(context->tp, dp, cursor->blkno,
> + XFS_DABUF_MAP_NOMAPPING, &bp,
> + XFS_ATTR_FORK);
> if ((error != 0) && (error != -EFSCORRUPTED))
> return error;
> if (bp) {
> @@ -377,7 +379,8 @@ xfs_attr_node_list(
> break;
> cursor->blkno = leafhdr.forw;
> xfs_trans_brelse(context->tp, bp);
> - error = xfs_attr3_leaf_read(context->tp, dp, cursor->blkno, -1, &bp);
> + error = xfs_attr3_leaf_read(context->tp, dp, cursor->blkno,
> + XFS_DABUF_MAP_NOMAPPING, &bp);
> if (error)
> return error;
> }
> @@ -497,7 +500,8 @@ xfs_attr_leaf_list(xfs_attr_list_context_t *context)
> trace_xfs_attr_leaf_list(context);
>
> context->cursor->blkno = 0;
> - error = xfs_attr3_leaf_read(context->tp, context->dp, 0, -1, &bp);
> + error = xfs_attr3_leaf_read(context->tp, context->dp, 0,
> + XFS_DABUF_MAP_NOMAPPING, &bp);
> if (error)
> return error;
>

...more missing conversions of xfs_dir3_data_read in
xfs_dir2_leaf_readbuf; and of xfs_dir3_data_readahead in
xfs_dir2_leaf_readbuf...

...and a missing conversion of xfs_dir3_data_readahead in xfs_dir_open
in fs/xfs/xfs_file.c.

--D

> --
> 2.7.4
>