[PATCH 18/31] xfs: remove parent pointers in unlink

Darrick J. Wong
2024-04-16T01:30:44Z

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

This patch removes the parent pointer attribute during unlink

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: adjust to new ondisk format, minor rebase fixes]
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
fs/xfs/libxfs/xfs_parent.c | 22 ++++++++++++++++++++++
fs/xfs/libxfs/xfs_parent.h | 3 +++
fs/xfs/libxfs/xfs_trans_space.c | 13 +++++++++++++
fs/xfs/libxfs/xfs_trans_space.h | 3 +--
fs/xfs/xfs_inode.c | 27 +++++++++++++++++++++------
5 files changed, 60 insertions(+), 8 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_parent.c b/fs/xfs/libxfs/xfs_parent.c
index 1cd655c6b3181..7b068ae4f449f 100644
--- a/fs/xfs/libxfs/xfs_parent.c
+++ b/fs/xfs/libxfs/xfs_parent.c
@@ -205,3 +205,25 @@ xfs_parent_addname(
xfs_attr_defer_parent(&ppargs->args, XFS_ATTR_DEFER_SET);
return 0;
}
+
+/* Remove a parent pointer to reflect a dirent removal. */
+int
+xfs_parent_removename(
+ 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_REMOVE);
+ return 0;
+}
diff --git a/fs/xfs/libxfs/xfs_parent.h b/fs/xfs/libxfs/xfs_parent.h
index 6de24e3ef318c..4a7fd48c226a4 100644
--- a/fs/xfs/libxfs/xfs_parent.h
+++ b/fs/xfs/libxfs/xfs_parent.h
@@ -81,5 +81,8 @@ xfs_parent_finish(
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 xfs_parent_removename(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
index c8adda82debe0..df729e4f1a4c9 100644
--- a/fs/xfs/libxfs/xfs_trans_space.c
+++ b/fs/xfs/libxfs/xfs_trans_space.c
@@ -81,3 +81,16 @@ xfs_symlink_space_res(

return ret;
}
+
+unsigned int
+xfs_remove_space_res(
+ struct xfs_mount *mp,
+ unsigned int namelen)
+{
+ unsigned int ret = XFS_DIRREMOVE_SPACE_RES(mp);
+
+ if (xfs_has_parent(mp))
+ ret += xfs_parent_calc_space_res(mp, namelen);
+
+ return ret;
+}
diff --git a/fs/xfs/libxfs/xfs_trans_space.h b/fs/xfs/libxfs/xfs_trans_space.h
index 354ad1d6e18d6..a4490813c56f1 100644
--- a/fs/xfs/libxfs/xfs_trans_space.h
+++ b/fs/xfs/libxfs/xfs_trans_space.h
@@ -91,8 +91,6 @@
XFS_DQUOT_CLUSTER_SIZE_FSB)
#define XFS_QM_QINOCREATE_SPACE_RES(mp) \
XFS_IALLOC_SPACE_RES(mp)
-#define XFS_REMOVE_SPACE_RES(mp) \
- XFS_DIRREMOVE_SPACE_RES(mp)
#define XFS_RENAME_SPACE_RES(mp,nl) \
(XFS_DIRREMOVE_SPACE_RES(mp) + XFS_DIRENTER_SPACE_RES(mp,nl))
#define XFS_IFREE_SPACE_RES(mp) \
@@ -106,5 +104,6 @@ unsigned int xfs_mkdir_space_res(struct xfs_mount *mp, unsigned int namelen);
unsigned int xfs_link_space_res(struct xfs_mount *mp, unsigned int namelen);
unsigned int xfs_symlink_space_res(struct xfs_mount *mp, unsigned int namelen,
unsigned int fsblocks);
+unsigned int xfs_remove_space_res(struct xfs_mount *mp, unsigned int namelen);

#endif /* __XFS_TRANS_SPACE_H__ */
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 4a3fbd8d33099..492d8d1055e9e 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -2720,16 +2720,17 @@ xfs_iunpin_wait(
*/
int
xfs_remove(
- xfs_inode_t *dp,
+ struct xfs_inode *dp,
struct xfs_name *name,
- xfs_inode_t *ip)
+ struct xfs_inode *ip)
{
- xfs_mount_t *mp = dp->i_mount;
- xfs_trans_t *tp = NULL;
+ struct xfs_mount *mp = dp->i_mount;
+ struct xfs_trans *tp = NULL;
int is_dir = S_ISDIR(VFS_I(ip)->i_mode);
int dontcare;
int error = 0;
uint resblks;
+ struct xfs_parent_args *ppargs;

trace_xfs_remove(dp, name);

@@ -2746,6 +2747,10 @@ xfs_remove(
if (error)
goto std_return;

+ error = xfs_parent_start(mp, &ppargs);
+ if (error)
+ goto std_return;
+
/*
* We try to get the real space reservation first, allowing for
* directory btree deletion(s) implying possible bmap insert(s). If we
@@ -2757,12 +2762,12 @@ xfs_remove(
* the directory code can handle a reservationless update and we don't
* want to prevent a user from trying to free space by deleting things.
*/
- resblks = XFS_REMOVE_SPACE_RES(mp);
+ resblks = xfs_remove_space_res(mp, name->len);
error = xfs_trans_alloc_dir(dp, &M_RES(mp)->tr_remove, ip, &resblks,
&tp, &dontcare);
if (error) {
ASSERT(error != -ENOSPC);
- goto std_return;
+ goto out_parent;
}

/*
@@ -2822,6 +2827,13 @@ xfs_remove(
goto out_trans_cancel;
}

+ /* Remove parent pointer. */
+ if (ppargs) {
+ error = xfs_parent_removename(tp, ppargs, dp, name, ip);
+ if (error)
+ goto out_trans_cancel;
+ }
+
/*
* Drop the link from dp to ip, and if ip was a directory, remove the
* '.' and '..' references since we freed the directory.
@@ -2845,6 +2857,7 @@ xfs_remove(

xfs_iunlock(ip, XFS_ILOCK_EXCL);
xfs_iunlock(dp, XFS_ILOCK_EXCL);
+ xfs_parent_finish(mp, ppargs);
return 0;

out_trans_cancel:
@@ -2852,6 +2865,8 @@ xfs_remove(
out_unlock:
xfs_iunlock(ip, XFS_ILOCK_EXCL);
xfs_iunlock(dp, XFS_ILOCK_EXCL);
+ out_parent:
+ xfs_parent_finish(mp, ppargs);
std_return:
return error;
}