[PATCH 15/31] xfs: parent pointer attribute creation

Darrick J. Wong
2024-04-16T01:29:57Z

From: Allison Henderson <allison.henderson@oracle.com>

Add parent pointer attribute during xfs_create, and subroutines to
initialize attributes. Note that the xfs_attr_intent object contains a
pointer to the caller's xfs_da_args object, so the latter must persist
until transaction commit.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
[djwong: shorten names, adjust to new format, set init_xattrs for parent
pointers]
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
fs/xfs/Makefile | 1 +
fs/xfs/libxfs/xfs_parent.c | 68 +++++++++++++++++++++++++++++++++++++++
fs/xfs/libxfs/xfs_parent.h | 65 +++++++++++++++++++++++++++++++++++++
fs/xfs/libxfs/xfs_trans_space.c | 52 ++++++++++++++++++++++++++++++
fs/xfs/libxfs/xfs_trans_space.h | 9 +++--
fs/xfs/scrub/tempfile.c | 2 +
fs/xfs/xfs_inode.c | 32 +++++++++++++++---
fs/xfs/xfs_iops.c | 15 ++++++++-
fs/xfs/xfs_super.c | 10 ++++++
fs/xfs/xfs_xattr.c | 2 +
fs/xfs/xfs_xattr.h | 2 +
11 files changed, 245 insertions(+), 13 deletions(-)
create mode 100644 fs/xfs/libxfs/xfs_trans_space.c

diff --git a/fs/xfs/Makefile b/fs/xfs/Makefile
index 4956ea9a307b8..0c1a0b67af93c 100644
--- a/fs/xfs/Makefile
+++ b/fs/xfs/Makefile
@@ -51,6 +51,7 @@ xfs-y += $(addprefix libxfs/, \
xfs_symlink_remote.o \
xfs_trans_inode.o \
xfs_trans_resv.o \
+ xfs_trans_space.o \
xfs_types.o \
)
# xfs_rtbitmap is shared with libxfs
diff --git a/fs/xfs/libxfs/xfs_parent.c b/fs/xfs/libxfs/xfs_parent.c
index d564baf2549c5..1cd655c6b3181 100644
--- a/fs/xfs/libxfs/xfs_parent.c
+++ b/fs/xfs/libxfs/xfs_parent.c
@@ -27,6 +27,10 @@
#include "xfs_xattr.h"
#include "xfs_parent.h"
#include "xfs_trans_space.h"
+#include "xfs_attr_item.h"
+#include "xfs_health.h"
+
+struct kmem_cache *xfs_parent_args_cache;

/*
* Parent pointer attribute handling.
@@ -137,3 +141,67 @@ xfs_parent_hashattr(

return xfs_parent_hashval(mp, name, namelen, be64_to_cpu(rec->p_ino));
}
+
+/*
+ * Initialize the parent pointer arguments structure. Caller must have zeroed
+ * the contents of @args. @tp is only required for updates.
+ */
+static void
+xfs_parent_da_args_init(
+ struct xfs_da_args *args,
+ struct xfs_trans *tp,
+ struct xfs_parent_rec *rec,
+ struct xfs_inode *child,
+ xfs_ino_t owner,
+ const struct xfs_name *parent_name)
+{
+ args->geo = child->i_mount->m_attr_geo;
+ args->whichfork = XFS_ATTR_FORK;
+ args->attr_filter = XFS_ATTR_PARENT;
+ args->op_flags = XFS_DA_OP_LOGGED | XFS_DA_OP_OKNOENT;
+ args->trans = tp;
+ args->dp = child;
+ args->owner = owner;
+ args->name = parent_name->name;
+ args->namelen = parent_name->len;
+ args->value = rec;
+ args->valuelen = sizeof(struct xfs_parent_rec);
+ xfs_attr_sethash(args);
+}
+
+/* Make sure the incore state is ready for a parent pointer query/update. */
+static inline int
+xfs_parent_iread_extents(
+ struct xfs_trans *tp,
+ struct xfs_inode *child)
+{
+ /* Parent pointers require that the attr fork must exist. */
+ if (XFS_IS_CORRUPT(child->i_mount, !xfs_inode_has_attr_fork(child))) {
+ xfs_inode_mark_sick(child, XFS_SICK_INO_PARENT);
+ return -EFSCORRUPTED;
+ }
+
+ return xfs_iread_extents(tp, child, XFS_ATTR_FORK);
+}
+
+/* Add a parent pointer to reflect a dirent addition. */
+int
+xfs_parent_addname(
+ struct xfs_trans *tp,
+ struct xfs_parent_args *ppargs,
+ struct xfs_inode *dp,
+ const struct xfs_name *parent_name,
+ struct xfs_inode *child)
+{
+ int error;
+
+ error = xfs_parent_iread_extents(tp, child);
+ if (error)
+ return error;
+
+ xfs_inode_to_parent_rec(&ppargs->rec, dp);
+ xfs_parent_da_args_init(&ppargs->args, tp, &ppargs->rec, child,
+ child->i_ino, parent_name);
+ xfs_attr_defer_parent(&ppargs->args, XFS_ATTR_DEFER_SET);
+ return 0;
+}
diff --git a/fs/xfs/libxfs/xfs_parent.h b/fs/xfs/libxfs/xfs_parent.h
index 6a4028871b72a..6de24e3ef318c 100644
--- a/fs/xfs/libxfs/xfs_parent.h
+++ b/fs/xfs/libxfs/xfs_parent.h
@@ -17,4 +17,69 @@ xfs_dahash_t xfs_parent_hashval(struct xfs_mount *mp, const uint8_t *name,
xfs_dahash_t xfs_parent_hashattr(struct xfs_mount *mp, const uint8_t *name,
int namelen, const void *value, int valuelen);

+/* Initializes a xfs_parent_rec to be stored as an attribute name. */
+static inline void
+xfs_parent_rec_init(
+ struct xfs_parent_rec *rec,
+ xfs_ino_t ino,
+ uint32_t gen)
+{
+ rec->p_ino = cpu_to_be64(ino);
+ rec->p_gen = cpu_to_be32(gen);
+}
+
+/* Initializes a xfs_parent_rec to be stored as an attribute name. */
+static inline void
+xfs_inode_to_parent_rec(
+ struct xfs_parent_rec *rec,
+ const struct xfs_inode *dp)
+{
+ xfs_parent_rec_init(rec, dp->i_ino, VFS_IC(dp)->i_generation);
+}
+
+extern struct kmem_cache *xfs_parent_args_cache;
+
+/*
+ * Parent pointer information needed to pass around the deferred xattr update
+ * machinery.
+ */
+struct xfs_parent_args {
+ struct xfs_parent_rec rec;
+ struct xfs_da_args args;
+};
+
+/*
+ * Start a parent pointer update by allocating the context object we need to
+ * perform a parent pointer update.
+ */
+static inline int
+xfs_parent_start(
+ struct xfs_mount *mp,
+ struct xfs_parent_args **ppargsp)
+{
+ if (!xfs_has_parent(mp)) {
+ *ppargsp = NULL;
+ return 0;
+ }
+
+ *ppargsp = kmem_cache_zalloc(xfs_parent_args_cache, GFP_KERNEL);
+ if (!*ppargsp)
+ return -ENOMEM;
+ return 0;
+}
+
+/* Finish a parent pointer update by freeing the context object. */
+static inline void
+xfs_parent_finish(
+ struct xfs_mount *mp,
+ struct xfs_parent_args *ppargs)
+{
+ if (ppargs)
+ kmem_cache_free(xfs_parent_args_cache, ppargs);
+}
+
+int xfs_parent_addname(struct xfs_trans *tp, struct xfs_parent_args *ppargs,
+ struct xfs_inode *dp, const struct xfs_name *parent_name,
+ struct xfs_inode *child);
+
#endif /* __XFS_PARENT_H__ */
diff --git a/fs/xfs/libxfs/xfs_trans_space.c b/fs/xfs/libxfs/xfs_trans_space.c
new file mode 100644
index 0000000000000..90532c3fa2053
--- /dev/null
+++ b/fs/xfs/libxfs/xfs_trans_space.c
@@ -0,0 +1,52 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2000,2005 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ */
+#include "xfs.h"
+#include "xfs_fs.h"
+#include "xfs_shared.h"
+#include "xfs_format.h"
+#include "xfs_da_format.h"
+#include "xfs_log_format.h"
+#include "xfs_trans_resv.h"
+#include "xfs_mount.h"
+#include "xfs_da_btree.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_trans_space.h"
+
+/* Calculate the disk space required to add a parent pointer. */
+unsigned int
+xfs_parent_calc_space_res(
+ struct xfs_mount *mp,
+ unsigned int namelen)
+{
+ /*
+ * Parent pointers are always the first attr in an attr tree, and never
+ * larger than a block
+ */
+ return XFS_DAENTER_SPACE_RES(mp, XFS_ATTR_FORK) +
+ XFS_NEXTENTADD_SPACE_RES(mp, namelen, XFS_ATTR_FORK);
+}
+
+unsigned int
+xfs_create_space_res(
+ struct xfs_mount *mp,
+ unsigned int namelen)
+{
+ unsigned int ret;
+
+ ret = XFS_IALLOC_SPACE_RES(mp) + XFS_DIRENTER_SPACE_RES(mp, namelen);
+ if (xfs_has_parent(mp))
+ ret += xfs_parent_calc_space_res(mp, namelen);
+
+ return ret;
+}
+
+unsigned int
+xfs_mkdir_space_res(
+ struct xfs_mount *mp,
+ unsigned int namelen)
+{
+ return xfs_create_space_res(mp, namelen);
+}
diff --git a/fs/xfs/libxfs/xfs_trans_space.h b/fs/xfs/libxfs/xfs_trans_space.h
index 9640fc232c147..6cda87153b38c 100644
--- a/fs/xfs/libxfs/xfs_trans_space.h
+++ b/fs/xfs/libxfs/xfs_trans_space.h
@@ -80,8 +80,6 @@
/* This macro is not used - see inline code in xfs_attr_set */
#define XFS_ATTRSET_SPACE_RES(mp, v) \
(XFS_DAENTER_SPACE_RES(mp, XFS_ATTR_FORK) + XFS_B_TO_FSB(mp, v))
-#define XFS_CREATE_SPACE_RES(mp,nl) \
- (XFS_IALLOC_SPACE_RES(mp) + XFS_DIRENTER_SPACE_RES(mp,nl))
#define XFS_DIOSTRAT_SPACE_RES(mp, v) \
(XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK) + (v))
#define XFS_GROWFS_SPACE_RES(mp) \
@@ -90,8 +88,6 @@
((b) + XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK))
#define XFS_LINK_SPACE_RES(mp,nl) \
XFS_DIRENTER_SPACE_RES(mp,nl)
-#define XFS_MKDIR_SPACE_RES(mp,nl) \
- (XFS_IALLOC_SPACE_RES(mp) + XFS_DIRENTER_SPACE_RES(mp,nl))
#define XFS_QM_DQALLOC_SPACE_RES(mp) \
(XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK) + \
XFS_DQUOT_CLUSTER_SIZE_FSB)
@@ -106,5 +102,10 @@
#define XFS_IFREE_SPACE_RES(mp) \
(xfs_has_finobt(mp) ? M_IGEO(mp)->inobt_maxlevels : 0)

+unsigned int xfs_parent_calc_space_res(struct xfs_mount *mp,
+ unsigned int namelen);
+
+unsigned int xfs_create_space_res(struct xfs_mount *mp, unsigned int namelen);
+unsigned int xfs_mkdir_space_res(struct xfs_mount *mp, unsigned int namelen);

#endif /* __XFS_TRANS_SPACE_H__ */
diff --git a/fs/xfs/scrub/tempfile.c b/fs/xfs/scrub/tempfile.c
index 6f39504a216ea..ddbcccb3dba13 100644
--- a/fs/xfs/scrub/tempfile.c
+++ b/fs/xfs/scrub/tempfile.c
@@ -71,7 +71,7 @@ xrep_tempfile_create(
return error;

if (is_dir) {
- resblks = XFS_MKDIR_SPACE_RES(mp, 0);
+ resblks = xfs_mkdir_space_res(mp, 0);
tres = &M_RES(mp)->tr_mkdir;
} else {
resblks = XFS_IALLOC_SPACE_RES(mp);
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index c079114b97ecf..ebef2767a86bd 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -40,6 +40,8 @@
#include "xfs_log_priv.h"
#include "xfs_health.h"
#include "xfs_pnfs.h"
+#include "xfs_parent.h"
+#include "xfs_xattr.h"

struct kmem_cache *xfs_inode_cache;

@@ -1016,7 +1018,7 @@ xfs_dir_hook_setup(
int
xfs_create(
struct mnt_idmap *idmap,
- xfs_inode_t *dp,
+ struct xfs_inode *dp,
struct xfs_name *name,
umode_t mode,
dev_t rdev,
@@ -1028,7 +1030,7 @@ xfs_create(
struct xfs_inode *ip = NULL;
struct xfs_trans *tp = NULL;
int error;
- bool unlock_dp_on_error = false;
+ bool unlock_dp_on_error = false;
prid_t prid;
struct xfs_dquot *udqp = NULL;
struct xfs_dquot *gdqp = NULL;
@@ -1036,6 +1038,7 @@ xfs_create(
struct xfs_trans_res *tres;
uint resblks;
xfs_ino_t ino;
+ struct xfs_parent_args *ppargs;

trace_xfs_create(dp, name);

@@ -1057,13 +1060,17 @@ xfs_create(
return error;

if (is_dir) {
- resblks = XFS_MKDIR_SPACE_RES(mp, name->len);
+ resblks = xfs_mkdir_space_res(mp, name->len);
tres = &M_RES(mp)->tr_mkdir;
} else {
- resblks = XFS_CREATE_SPACE_RES(mp, name->len);
+ resblks = xfs_create_space_res(mp, name->len);
tres = &M_RES(mp)->tr_create;
}

+ error = xfs_parent_start(mp, &ppargs);
+ if (error)
+ goto out_release_dquots;
+
/*
* Initially assume that the file does not exist and
* reserve the resources for that case. If that is not
@@ -1079,7 +1086,7 @@ xfs_create(
resblks, &tp);
}
if (error)
- goto out_release_dquots;
+ goto out_parent;

xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
unlock_dp_on_error = true;
@@ -1122,6 +1129,16 @@ xfs_create(
xfs_bumplink(tp, dp);
}

+ /*
+ * If we have parent pointers, we need to add the attribute containing
+ * the parent information now.
+ */
+ if (ppargs) {
+ error = xfs_parent_addname(tp, ppargs, dp, name, ip);
+ if (error)
+ goto out_trans_cancel;
+ }
+
/*
* Create ip with a reference from dp, and add '.' and '..' references
* if it's a directory.
@@ -1154,6 +1171,7 @@ xfs_create(
*ipp = ip;
xfs_iunlock(ip, XFS_ILOCK_EXCL);
xfs_iunlock(dp, XFS_ILOCK_EXCL);
+ xfs_parent_finish(mp, ppargs);
return 0;

out_trans_cancel:
@@ -1169,6 +1187,8 @@ xfs_create(
xfs_finish_inode_setup(ip);
xfs_irele(ip);
}
+ out_parent:
+ xfs_parent_finish(mp, ppargs);
out_release_dquots:
xfs_qm_dqrele(udqp);
xfs_qm_dqrele(gdqp);
@@ -3037,7 +3057,7 @@ xfs_rename_alloc_whiteout(
int error;

error = xfs_create_tmpfile(idmap, dp, S_IFCHR | WHITEOUT_MODE,
- false, &tmpfile);
+ xfs_has_parent(dp->i_mount), &tmpfile);
if (error)
return error;

diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index 149f854bf12dc..0b3546f6c443c 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -157,6 +157,8 @@ xfs_create_need_xattr(
if (dir->i_sb->s_security)
return true;
#endif
+ if (xfs_has_parent(XFS_I(dir)->i_mount))
+ return true;
return false;
}

@@ -201,7 +203,18 @@ xfs_generic_create(
xfs_create_need_xattr(dir, default_acl, acl),
&ip);
} else {
- error = xfs_create_tmpfile(idmap, XFS_I(dir), mode, false, &ip);
+ bool init_xattrs = false;
+
+ /*
+ * If this temporary file will be linkable, set up the file
+ * with an attr fork to receive a parent pointer.
+ */
+ if (!(tmpfile->f_flags & O_EXCL) &&
+ xfs_has_parent(XFS_I(dir)->i_mount))
+ init_xattrs = true;
+
+ error = xfs_create_tmpfile(idmap, XFS_I(dir), mode,
+ init_xattrs, &ip);
}
if (unlikely(error))
goto out_free_acl;
diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 5c9ba974252d1..84f37e8474da2 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -44,6 +44,7 @@
#include "xfs_dahash_test.h"
#include "xfs_rtbitmap.h"
#include "xfs_exchmaps_item.h"
+#include "xfs_parent.h"
#include "scrub/stats.h"
#include "scrub/rcbag_btree.h"

@@ -2202,8 +2203,16 @@ xfs_init_caches(void)
if (!xfs_xmi_cache)
goto out_destroy_xmd_cache;

+ xfs_parent_args_cache = kmem_cache_create("xfs_parent_args",
+ sizeof(struct xfs_parent_args),
+ 0, 0, NULL);
+ if (!xfs_parent_args_cache)
+ goto out_destroy_xmi_cache;
+
return 0;

+ out_destroy_xmi_cache:
+ kmem_cache_destroy(xfs_xmi_cache);
out_destroy_xmd_cache:
kmem_cache_destroy(xfs_xmd_cache);
out_destroy_iul_cache:
@@ -2264,6 +2273,7 @@ xfs_destroy_caches(void)
* destroy caches.
*/
rcu_barrier();
+ kmem_cache_destroy(xfs_parent_args_cache);
kmem_cache_destroy(xfs_xmd_cache);
kmem_cache_destroy(xfs_xmi_cache);
kmem_cache_destroy(xfs_iunlink_cache);
diff --git a/fs/xfs/xfs_xattr.c b/fs/xfs/xfs_xattr.c
index ba56a9e73144b..39651af255856 100644
--- a/fs/xfs/xfs_xattr.c
+++ b/fs/xfs/xfs_xattr.c
@@ -24,7 +24,7 @@
* Get permission to use log-assisted atomic exchange of file extents.
* Callers must not be running any transactions or hold any ILOCKs.
*/
-static inline int
+int
xfs_attr_grab_log_assist(
struct xfs_mount *mp)
{
diff --git a/fs/xfs/xfs_xattr.h b/fs/xfs/xfs_xattr.h
index c3eb858fb59e7..113a069e6a3d8 100644
--- a/fs/xfs/xfs_xattr.h
+++ b/fs/xfs/xfs_xattr.h
@@ -8,6 +8,8 @@

enum xfs_attr_update;
int xfs_attr_change(struct xfs_da_args *args, enum xfs_attr_update op);
+int xfs_attr_grab_log_assist(struct xfs_mount *mp);
+void xfs_attr_rele_log_assist(struct xfs_mount *mp);

extern const struct xattr_handler * const xfs_xattr_handlers[];