From: Dave Chinner <dchinner@xxxxxxxxxx>
Add parent pointer attribute during xfs_create, and
subroutines to initialize attributes
Kernel create routines take advantage of deferred attributes,
where as libxfs routines will add parent pointers directly.
[bfoster: rebase, use VFS inode generation]
[achender: rebased, changed __unint32_t to xfs_dir2_dataptr_t,
fixed some null pointer bugs,
merged error handling patch,
added subroutines to handle attribute initialization,
remove unnecessary ENOSPC handling in xfs_attr_set_first_parent]
Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>
Signed-off-by: Allison Henderson <allison.henderson@xxxxxxxxxx>
---
fs/xfs/Makefile | 2 +
fs/xfs/libxfs/xfs_parent.c | 132 +++++++++++++++++++++++++++++++++++++++++++++
fs/xfs/libxfs/xfs_parent.h | 36 +++++++++++++
fs/xfs/xfs_inode.c | 15 +++++-
fs/xfs/xfs_parent_utils.c | 51 ++++++++++++++++++
fs/xfs/xfs_parent_utils.h | 26 +++++++++
6 files changed, 261 insertions(+), 1 deletion(-)
diff --git a/fs/xfs/Makefile b/fs/xfs/Makefile
index d3c0004..d092f72 100644
--- a/fs/xfs/Makefile
+++ b/fs/xfs/Makefile
@@ -53,6 +53,7 @@ xfs-y += $(addprefix libxfs/, \
xfs_inode_fork.o \
xfs_inode_buf.o \
xfs_log_rlimit.o \
+ xfs_parent.o \
xfs_ag_resv.o \
xfs_rmap.o \
xfs_rmap_btree.o \
@@ -92,6 +93,7 @@ xfs-y += xfs_aops.o \
xfs_message.o \
xfs_mount.o \
xfs_mru_cache.o \
+ xfs_parent_utils.o \
xfs_reflink.o \
xfs_stats.o \
xfs_super.o \
diff --git a/fs/xfs/libxfs/xfs_parent.c b/fs/xfs/libxfs/xfs_parent.c
new file mode 100644
index 0000000..fa534a9
--- /dev/null
+++ b/fs/xfs/libxfs/xfs_parent.c
@@ -0,0 +1,132 @@
+/*
+ * Copyright (c) 2015 Red Hat, Inc.
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation
+ */
+#include "xfs.h"
+#include "xfs_fs.h"
+#include "xfs_format.h"
+#include "xfs_da_format.h"
+#include "xfs_log_format.h"
+#include "xfs_shared.h"
+#include "xfs_trans_resv.h"
+#include "xfs_mount.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_inode.h"
+#include "xfs_error.h"
+#include "xfs_trace.h"
+#include "xfs_trans.h"
+#include "xfs_attr.h"
+#include "xfs_da_btree.h"
+#include "xfs_attr_sf.h"
+#include "xfs_bmap.h"
+
+/*
+ * Parent pointer attribute handling.
+ *
+ * Because the attribute value is a filename component, it will never be longer
+ * than 255 bytes. This means the attribute will always be a local format
+ * attribute as it is xfs_attr_leaf_entsize_local_max() for v5 filesystems will
+ * always be larger than this (max is 75% of block size).
+ *
+ * Creating a new parent attribute will always create a new attribute - there
+ * should never, ever be an existing attribute in the tree for a new inode.
+ * ENOSPC behaviour is problematic - creating the inode without the parent
+ * pointer is effectively a corruption, so we allow parent attribute creation
+ * to dip into the reserve block pool to avoid unexpected ENOSPC errors from
+ * occurring.
+ */
+
+
+/* Initializes a xfs_parent_name_rec to be stored as an attribute name */
+void
+xfs_init_parent_name_rec(
+ struct xfs_parent_name_rec *rec,
+ xfs_ino_t p_ino,
+ uint32_t p_gen,
+ uint32_t p_diroffset)
+{
+ rec->p_ino = cpu_to_be64(p_ino);
+ rec->p_gen = cpu_to_be32(p_gen);
+ rec->p_diroffset = cpu_to_be32(p_diroffset);
+}
+
+/* Initializes a xfs_parent_name_irec from an xfs_parent_name_rec */
+void
+xfs_init_parent_name_irec(
+ struct xfs_parent_name_irec *irec,
+ struct xfs_parent_name_rec *rec)
+{
+ irec->p_ino = be64_to_cpu(rec->p_ino);
+ irec->p_gen = be32_to_cpu(rec->p_gen);
+ irec->p_diroffset = be32_to_cpu(rec->p_diroffset);
+}
+
+/*
+ * Directly add a parent pointer instead of as a deferred operation
+ * Currently only used during protofile creation
+ */
+int
+xfs_parent_add(
+ struct xfs_trans *tp,
+ struct xfs_inode *parent,
+ struct xfs_inode *child,
+ struct xfs_name *child_name,
+ uint32_t diroffset,
+ xfs_fsblock_t *firstblock,
+ struct xfs_defer_ops *dfops)
+{
+ struct xfs_parent_name_rec rec;
+ int error;
+ struct xfs_da_args args;
+ int flags = ATTR_PARENT;
+ int local = 0;
+ int rsvd = 0;
+ struct xfs_buf *leaf_bp = NULL;
+
+ xfs_init_parent_name_rec(&rec, parent->i_ino,
+ VFS_I(parent)->i_generation, diroffset);
+
+ error = xfs_attr_args_init(&args, child, (const unsigned char *)&rec,
+ sizeof(rec), flags);
+ if (error)
+ return error;
+
+ args.hashval = xfs_da_hashname(args.name, args.namelen);
+ args.value = (char *)child_name->name;
+ args.valuelen = child_name->len;
+ args.dfops = dfops;
+ args.op_flags = XFS_DA_OP_OKNOENT | XFS_DA_OP_ADDNAME;
+ args.firstblock = firstblock;
+ args.total = xfs_attr_calc_size(&args, &local);
+ args.trans = tp;
+ ASSERT(local);
+
+ /*
+ * If the inode doesn't have an attribute fork, add one.
+ * (inode must not be locked when we call this routine)
+ */
+ if (XFS_IFORK_Q(child) == 0) {
+ int sf_size = sizeof(xfs_attr_sf_hdr_t) +
+ XFS_ATTR_SF_ENTSIZE_BYNAME(args.namelen, args.valuelen);
+
+ error = xfs_bmap_add_attrfork(child, sf_size, rsvd);
+ if (error)
+ return error;
+ }
+
+ error = xfs_attr_set_args(&args, flags, leaf_bp, false);
+ return error;
+}
+
diff --git a/fs/xfs/libxfs/xfs_parent.h b/fs/xfs/libxfs/xfs_parent.h
new file mode 100644
index 0000000..298562b
--- /dev/null
+++ b/fs/xfs/libxfs/xfs_parent.h
@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2017 Oracle, Inc.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation Inc.
+ */
+#ifndef __XFS_PARENT_H__
+#define __XFS_PARENT_H__
+
+#include "xfs_da_format.h"
+#include "xfs_format.h"
+
+/*
+ * Parent pointer attribute prototypes
+ */
+void xfs_init_parent_name_rec(struct xfs_parent_name_rec *rec,
+ xfs_ino_t p_ino, uint32_t p_gen,
+ uint32_t p_diroffset);
+void xfs_init_parent_name_irec(struct xfs_parent_name_irec *irec,
+ struct xfs_parent_name_rec *rec);
+
+int xfs_parent_add(struct xfs_trans *tp, struct xfs_inode *parent,
+ struct xfs_inode *child, struct xfs_name *child_name,
+ uint32_t diroffset, xfs_fsblock_t *firstblock,
+ struct xfs_defer_ops *dfops);
+#endif /* __XFS_PARENT_H__ */
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 5c291d2..0cfdc2f 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -53,6 +53,7 @@
#include "xfs_bmap_btree.h"
#include "xfs_reflink.h"
#include "xfs_dir2_priv.h"
+#include "xfs_parent_utils.h"
kmem_zone_t *xfs_inode_zone;
@@ -1151,6 +1152,7 @@ xfs_create(
struct xfs_dquot *pdqp = NULL;
struct xfs_trans_res *tres;
uint resblks;
+ xfs_dir2_dataptr_t diroffset;
trace_xfs_create(dp, name);
@@ -1227,7 +1229,7 @@ xfs_create(
error = xfs_dir_createname(tp, dp, name, ip->i_ino,
&first_block, &dfops, resblks ?
resblks - XFS_IALLOC_SPACE_RES(mp) : 0,
- NULL);
+ &diroffset);
if (error) {
ASSERT(error != -ENOSPC);
goto out_trans_cancel;
@@ -1246,6 +1248,17 @@ xfs_create(
}
/*
+ * If we have parent pointers, we need to add the attribute containing
+ * the parent information now.
+ */
+ if (xfs_sb_version_hasparent(&mp->m_sb)) {
+ error = xfs_parent_add_deferred(dp, ip, name, diroffset,
+ &dfops);
+ if (error)
+ goto out_bmap_cancel;
+ }
+
+ /*
* If this is a synchronous mount, make sure that the
* create transaction goes to disk before returning to
* the user.
diff --git a/fs/xfs/xfs_parent_utils.c b/fs/xfs/xfs_parent_utils.c
new file mode 100644
index 0000000..cf4a7e2
--- /dev/null
+++ b/fs/xfs/xfs_parent_utils.c
@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2015 Red Hat, Inc.
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation
+ */
+#include "xfs.h"
+#include "xfs_fs.h"
+#include "xfs_format.h"
+#include "xfs_log_format.h"
+#include "xfs_shared.h"
+#include "xfs_trans_resv.h"
+#include "xfs_mount.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_inode.h"
+#include "xfs_error.h"
+#include "xfs_trace.h"
+#include "xfs_trans.h"
+#include "xfs_attr.h"
+#include "xfs_parent.h"
+
+/*
+ * Add a parent record to an inode with existing parent records.
+ */
+int
+xfs_parent_add_deferred(
+ struct xfs_inode *parent,
+ struct xfs_inode *child,
+ struct xfs_name *child_name,
+ uint32_t diroffset,
+ struct xfs_defer_ops *dfops)
+{
+ struct xfs_parent_name_rec rec;
+
+ xfs_init_parent_name_rec(&rec, parent->i_ino,
+ VFS_I(parent)->i_generation, diroffset);
+
+ return xfs_attr_set_deferred(child, dfops, &rec, sizeof(rec),
+ (void *)child_name->name, child_name->len, ATTR_PARENT);
+}
+
diff --git a/fs/xfs/xfs_parent_utils.h b/fs/xfs/xfs_parent_utils.h
new file mode 100644
index 0000000..a667d1d
--- /dev/null
+++ b/fs/xfs/xfs_parent_utils.h
@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2017 Oracle, Inc.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation Inc.
+ */
+#ifndef __XFS_PARENT_UTILS_H__
+#define __XFS_PARENT_UTILS_H__
+
+/*
+ * Parent pointer attribute prototypes
+ */
+int xfs_parent_add_deferred(struct xfs_inode *parent, struct xfs_inode *child,
+ struct xfs_name *child_name, uint32_t diroffset,
+ struct xfs_defer_ops *dfops);
+#endif /* __XFS_PARENT_UTILS_H__ */
--
2.7.4
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