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xfs: refactor dir format helpers

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Add a new enum and a xfs_dir2_format helper that returns it to allow
the code to switch on the format of a directory in a single operation
and switch all helpers of xfs_dir2_isblock and xfs_dir2_isleaf to it.

This also removes the explicit xfs_iread_extents call in a few of the
call sites given that xfs_bmap_last_offset already takes care of it
underneath.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>
This commit is contained in:
Christoph Hellwig 2024-04-25 15:17:03 +02:00 committed by Chandan Babu R
parent dfe5febe2b
commit e58ac1770d
6 changed files with 105 additions and 150 deletions
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182
fs/xfs/libxfs/xfs_dir2.c
View File

@ -256,31 +256,60 @@ xfs_dir_init(
return error;
}
enum xfs_dir2_fmt
xfs_dir2_format(
struct xfs_da_args *args,
int *error)
{
struct xfs_inode *dp = args->dp;
struct xfs_mount *mp = dp->i_mount;
struct xfs_da_geometry *geo = mp->m_dir_geo;
xfs_fileoff_t eof;
xfs_assert_ilocked(dp, XFS_ILOCK_SHARED | XFS_ILOCK_EXCL);
*error = 0;
if (dp->i_df.if_format == XFS_DINODE_FMT_LOCAL)
return XFS_DIR2_FMT_SF;
*error = xfs_bmap_last_offset(dp, &eof, XFS_DATA_FORK);
if (*error)
return XFS_DIR2_FMT_ERROR;
if (eof == XFS_B_TO_FSB(mp, geo->blksize)) {
if (XFS_IS_CORRUPT(mp, dp->i_disk_size != geo->blksize)) {
xfs_da_mark_sick(args);
*error = -EFSCORRUPTED;
return XFS_DIR2_FMT_ERROR;
}
return XFS_DIR2_FMT_BLOCK;
}
if (eof == geo->leafblk + geo->fsbcount)
return XFS_DIR2_FMT_LEAF;
return XFS_DIR2_FMT_NODE;
}
int
xfs_dir_createname_args(
struct xfs_da_args *args)
{
bool is_block, is_leaf;
int error;
if (!args->inumber)
args->op_flags |= XFS_DA_OP_JUSTCHECK;
if (args->dp->i_df.if_format == XFS_DINODE_FMT_LOCAL)
switch (xfs_dir2_format(args, &error)) {
case XFS_DIR2_FMT_SF:
return xfs_dir2_sf_addname(args);
error = xfs_dir2_isblock(args, &is_block);
if (error)
return error;
if (is_block)
case XFS_DIR2_FMT_BLOCK:
return xfs_dir2_block_addname(args);
error = xfs_dir2_isleaf(args, &is_leaf);
if (error)
return error;
if (is_leaf)
case XFS_DIR2_FMT_LEAF:
return xfs_dir2_leaf_addname(args);
case XFS_DIR2_FMT_NODE:
return xfs_dir2_node_addname(args);
default:
return error;
}
}
/*
@ -359,36 +388,25 @@ int
xfs_dir_lookup_args(
struct xfs_da_args *args)
{
bool is_block, is_leaf;
int error;
if (args->dp->i_df.if_format == XFS_DINODE_FMT_LOCAL) {
switch (xfs_dir2_format(args, &error)) {
case XFS_DIR2_FMT_SF:
error = xfs_dir2_sf_lookup(args);
goto out;
}
/* dir2 functions require that the data fork is loaded */
error = xfs_iread_extents(args->trans, args->dp, XFS_DATA_FORK);
if (error)
goto out;
error = xfs_dir2_isblock(args, &is_block);
if (error)
goto out;
if (is_block) {
break;
case XFS_DIR2_FMT_BLOCK:
error = xfs_dir2_block_lookup(args);
goto out;
break;
case XFS_DIR2_FMT_LEAF:
error = xfs_dir2_leaf_lookup(args);
break;
case XFS_DIR2_FMT_NODE:
error = xfs_dir2_node_lookup(args);
break;
default:
break;
}
error = xfs_dir2_isleaf(args, &is_leaf);
if (error)
goto out;
if (is_leaf)
error = xfs_dir2_leaf_lookup(args);
else
error = xfs_dir2_node_lookup(args);
out:
if (error != -EEXIST)
return error;
return 0;
@ -448,24 +466,20 @@ int
xfs_dir_removename_args(
struct xfs_da_args *args)
{
bool is_block, is_leaf;
int error;
if (args->dp->i_df.if_format == XFS_DINODE_FMT_LOCAL)
switch (xfs_dir2_format(args, &error)) {
case XFS_DIR2_FMT_SF:
return xfs_dir2_sf_removename(args);
error = xfs_dir2_isblock(args, &is_block);
if (error)
return error;
if (is_block)
case XFS_DIR2_FMT_BLOCK:
return xfs_dir2_block_removename(args);
error = xfs_dir2_isleaf(args, &is_leaf);
if (error)
return error;
if (is_leaf)
case XFS_DIR2_FMT_LEAF:
return xfs_dir2_leaf_removename(args);
case XFS_DIR2_FMT_NODE:
return xfs_dir2_node_removename(args);
default:
return error;
}
}
/*
@ -509,25 +523,20 @@ int
xfs_dir_replace_args(
struct xfs_da_args *args)
{
bool is_block, is_leaf;
int error;
if (args->dp->i_df.if_format == XFS_DINODE_FMT_LOCAL)
switch (xfs_dir2_format(args, &error)) {
case XFS_DIR2_FMT_SF:
return xfs_dir2_sf_replace(args);
error = xfs_dir2_isblock(args, &is_block);
if (error)
return error;
if (is_block)
case XFS_DIR2_FMT_BLOCK:
return xfs_dir2_block_replace(args);
error = xfs_dir2_isleaf(args, &is_leaf);
if (error)
return error;
if (is_leaf)
case XFS_DIR2_FMT_LEAF:
return xfs_dir2_leaf_replace(args);
case XFS_DIR2_FMT_NODE:
return xfs_dir2_node_replace(args);
default:
return error;
}
}
/*
@ -633,57 +642,6 @@ xfs_dir2_grow_inode(
return 0;
}
/*
* See if the directory is a single-block form directory.
*/
int
xfs_dir2_isblock(
struct xfs_da_args *args,
bool *isblock)
{
struct xfs_mount *mp = args->dp->i_mount;
xfs_fileoff_t eof;
int error;
error = xfs_bmap_last_offset(args->dp, &eof, XFS_DATA_FORK);
if (error)
return error;
*isblock = false;
if (XFS_FSB_TO_B(mp, eof) != args->geo->blksize)
return 0;
*isblock = true;
if (XFS_IS_CORRUPT(mp, args->dp->i_disk_size != args->geo->blksize)) {
xfs_da_mark_sick(args);
return -EFSCORRUPTED;
}
return 0;
}
/*
* See if the directory is a single-leaf form directory.
*/
int
xfs_dir2_isleaf(
struct xfs_da_args *args,
bool *isleaf)
{
xfs_fileoff_t eof;
int error;
error = xfs_bmap_last_offset(args->dp, &eof, XFS_DATA_FORK);
if (error)
return error;
*isleaf = false;
if (eof != args->geo->leafblk + args->geo->fsbcount)
return 0;
*isleaf = true;
return 0;
}
/*
* Remove the given block from the directory.
* This routine is used for data and free blocks, leaf/node are done

12
fs/xfs/libxfs/xfs_dir2.h
View File

@ -36,6 +36,16 @@ xfs_dir2_samename(
return !memcmp(n1->name, n2->name, n1->len);
}
enum xfs_dir2_fmt {
XFS_DIR2_FMT_SF,
XFS_DIR2_FMT_BLOCK,
XFS_DIR2_FMT_LEAF,
XFS_DIR2_FMT_NODE,
XFS_DIR2_FMT_ERROR,
};
enum xfs_dir2_fmt xfs_dir2_format(struct xfs_da_args *args, int *error);
/*
* Convert inode mode to directory entry filetype
*/
@ -79,8 +89,6 @@ extern int xfs_dir2_sf_to_block(struct xfs_da_args *args);
/*
* Interface routines used by userspace utilities
*/
extern int xfs_dir2_isblock(struct xfs_da_args *args, bool *isblock);
extern int xfs_dir2_isleaf(struct xfs_da_args *args, bool *isleaf);
extern int xfs_dir2_shrink_inode(struct xfs_da_args *args, xfs_dir2_db_t db,
struct xfs_buf *bp);

9
fs/xfs/libxfs/xfs_exchmaps.c
View File

@ -465,17 +465,12 @@ xfs_exchmaps_dir_to_sf(
};
struct xfs_dir2_sf_hdr sfh;
struct xfs_buf *bp;
bool isblock;
int size;
int error;
int error = 0;
error = xfs_dir2_isblock(&args, &isblock);
if (error)
if (xfs_dir2_format(&args, &error) != XFS_DIR2_FMT_BLOCK)
return error;
if (!isblock)
return 0;
error = xfs_dir3_block_read(tp, xmi->xmi_ip2, xmi->xmi_ip2->i_ino, &bp);
if (error)
return error;

3
fs/xfs/scrub/dir.c
View File

@ -808,7 +808,8 @@ xchk_directory_blocks(
free_lblk = XFS_B_TO_FSB(mp, XFS_DIR2_FREE_OFFSET);
/* Is this a block dir? */
error = xfs_dir2_isblock(&args, &is_block);
if (xfs_dir2_format(&args, &error) == XFS_DIR2_FMT_BLOCK)
is_block = true;
if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, lblk, &error))
goto out;

22
fs/xfs/scrub/readdir.c
View File

@ -276,7 +276,6 @@ xchk_dir_walk(
.trans = sc->tp,
.owner = dp->i_ino,
};
bool isblock;
int error;
if (xfs_is_shutdown(dp->i_mount))
@ -285,22 +284,17 @@ xchk_dir_walk(
ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
xfs_assert_ilocked(dp, XFS_ILOCK_SHARED | XFS_ILOCK_EXCL);
if (dp->i_df.if_format == XFS_DINODE_FMT_LOCAL)
switch (xfs_dir2_format(&args, &error)) {
case XFS_DIR2_FMT_SF:
return xchk_dir_walk_sf(sc, dp, dirent_fn, priv);
/* dir2 functions require that the data fork is loaded */
error = xfs_iread_extents(sc->tp, dp, XFS_DATA_FORK);
if (error)
return error;
error = xfs_dir2_isblock(&args, &isblock);
if (error)
return error;
if (isblock)
case XFS_DIR2_FMT_BLOCK:
return xchk_dir_walk_block(sc, dp, dirent_fn, priv);
case XFS_DIR2_FMT_LEAF:
case XFS_DIR2_FMT_NODE:
return xchk_dir_walk_leaf(sc, dp, dirent_fn, priv);
default:
return error;
}
}
/*

19
fs/xfs/xfs_dir2_readdir.c
View File

@ -516,7 +516,6 @@ xfs_readdir(
{
struct xfs_da_args args = { NULL };
unsigned int lock_mode;
bool isblock;
int error;
trace_xfs_readdir(dp);
@ -539,18 +538,18 @@ xfs_readdir(
return xfs_dir2_sf_getdents(&args, ctx);
lock_mode = xfs_ilock_data_map_shared(dp);
error = xfs_dir2_isblock(&args, &isblock);
if (error)
goto out_unlock;
if (isblock) {
switch (xfs_dir2_format(&args, &error)) {
case XFS_DIR2_FMT_BLOCK:
error = xfs_dir2_block_getdents(&args, ctx, &lock_mode);
goto out_unlock;
break;
case XFS_DIR2_FMT_LEAF:
case XFS_DIR2_FMT_NODE:
error = xfs_dir2_leaf_getdents(&args, ctx, bufsize, &lock_mode);
break;
default:
break;
}
error = xfs_dir2_leaf_getdents(&args, ctx, bufsize, &lock_mode);
out_unlock:
if (lock_mode)
xfs_iunlock(dp, lock_mode);
return error;