[PATCH v5 28/32] afs: Make afs_mkdir() locally initialise a new directory's content

David Howells
2024-12-16T20:45:10Z

Initialise a new directory's content when it is created by mkdir locally
rather than downloading the content from the server as we can predict what
it's going to look like.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
---
fs/afs/dir.c | 3 +++
fs/afs/dir_edit.c | 49 ++++++++++++++++++++++++++++++++++++++
fs/afs/internal.h | 1 +
include/trace/events/afs.h | 2 ++
4 files changed, 55 insertions(+)

diff --git a/fs/afs/dir.c b/fs/afs/dir.c
index a386b4649f3e..bf46485d12f8 100644
--- a/fs/afs/dir.c
+++ b/fs/afs/dir.c
@@ -1264,6 +1264,7 @@ void afs_check_for_remote_deletion(struct afs_operation *op)
*/
static void afs_vnode_new_inode(struct afs_operation *op)
{
+ struct afs_vnode_param *dvp = &op->file[0];
struct afs_vnode_param *vp = &op->file[1];
struct afs_vnode *vnode;
struct inode *inode;
@@ -1283,6 +1284,8 @@ static void afs_vnode_new_inode(struct afs_operation *op)

vnode = AFS_FS_I(inode);
set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags);
+ if (S_ISDIR(inode->i_mode))
+ afs_mkdir_init_dir(vnode, dvp->vnode);
if (!afs_op_error(op))
afs_cache_permit(vnode, op->key, vnode->cb_break, &vp->scb);
d_instantiate(op->dentry, inode);
diff --git a/fs/afs/dir_edit.c b/fs/afs/dir_edit.c
index 71cce884e434..53178bb2d1a6 100644
--- a/fs/afs/dir_edit.c
+++ b/fs/afs/dir_edit.c
@@ -556,3 +556,52 @@ void afs_edit_dir_update_dotdot(struct afs_vnode *vnode, struct afs_vnode *new_d
0, 0, 0, 0, "..");
goto out;
}
+
+/*
+ * Initialise a new directory. We need to fill in the "." and ".." entries.
+ */
+void afs_mkdir_init_dir(struct afs_vnode *dvnode, struct afs_vnode *parent_dvnode)
+{
+ union afs_xdr_dir_block *meta;
+ struct afs_dir_iter iter = { .dvnode = dvnode };
+ union afs_xdr_dirent *de;
+ unsigned int slot = AFS_DIR_RESV_BLOCKS0;
+ loff_t i_size;
+
+ i_size = i_size_read(&dvnode->netfs.inode);
+ if (i_size != AFS_DIR_BLOCK_SIZE) {
+ afs_invalidate_dir(dvnode, afs_dir_invalid_edit_add_bad_size);
+ return;
+ }
+
+ meta = afs_dir_get_block(&iter, 0);
+ if (!meta)
+ return;
+
+ afs_edit_init_block(meta, meta, 0);
+
+ de = &meta->dirents[slot];
+ de->u.valid = 1;
+ de->u.vnode = htonl(dvnode->fid.vnode);
+ de->u.unique = htonl(dvnode->fid.unique);
+ memcpy(de->u.name, ".", 2);
+ trace_afs_edit_dir(dvnode, afs_edit_dir_for_mkdir, afs_edit_dir_mkdir, 0, slot,
+ dvnode->fid.vnode, dvnode->fid.unique, ".");
+ slot++;
+
+ de = &meta->dirents[slot];
+ de->u.valid = 1;
+ de->u.vnode = htonl(parent_dvnode->fid.vnode);
+ de->u.unique = htonl(parent_dvnode->fid.unique);
+ memcpy(de->u.name, "..", 3);
+ trace_afs_edit_dir(dvnode, afs_edit_dir_for_mkdir, afs_edit_dir_mkdir, 0, slot,
+ parent_dvnode->fid.vnode, parent_dvnode->fid.unique, "..");
+
+ afs_set_contig_bits(meta, AFS_DIR_RESV_BLOCKS0, 2);
+ meta->meta.alloc_ctrs[0] -= 2;
+ kunmap_local(meta);
+
+ netfs_single_mark_inode_dirty(&dvnode->netfs.inode);
+ set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags);
+ set_bit(AFS_VNODE_DIR_READ, &dvnode->flags);
+}
diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index cd2c4f85117d..acae1b5bfc63 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -1078,6 +1078,7 @@ extern void afs_edit_dir_add(struct afs_vnode *, struct qstr *, struct afs_fid *
extern void afs_edit_dir_remove(struct afs_vnode *, struct qstr *, enum afs_edit_dir_reason);
void afs_edit_dir_update_dotdot(struct afs_vnode *vnode, struct afs_vnode *new_dvnode,
enum afs_edit_dir_reason why);
+void afs_mkdir_init_dir(struct afs_vnode *dvnode, struct afs_vnode *parent_vnode);

/*
* dir_silly.c
diff --git a/include/trace/events/afs.h b/include/trace/events/afs.h
index cdb5f2af7799..c52fd83ca9b7 100644
--- a/include/trace/events/afs.h
+++ b/include/trace/events/afs.h
@@ -350,6 +350,7 @@ enum yfs_cm_operation {
EM(afs_dir_invalid_edit_add_no_slots, "edit-add-no-slots") \
EM(afs_dir_invalid_edit_add_too_many_blocks, "edit-add-too-many-blocks") \
EM(afs_dir_invalid_edit_get_block, "edit-get-block") \
+ EM(afs_dir_invalid_edit_mkdir, "edit-mkdir") \
EM(afs_dir_invalid_edit_rem_bad_size, "edit-rem-bad-size") \
EM(afs_dir_invalid_edit_rem_wrong_name, "edit-rem-wrong_name") \
EM(afs_dir_invalid_edit_upd_bad_size, "edit-upd-bad-size") \
@@ -371,6 +372,7 @@ enum yfs_cm_operation {
EM(afs_edit_dir_delete_error, "d_err ") \
EM(afs_edit_dir_delete_inval, "d_invl") \
EM(afs_edit_dir_delete_noent, "d_nent") \
+ EM(afs_edit_dir_mkdir, "mk_ent") \
EM(afs_edit_dir_update_dd, "u_ddot") \
EM(afs_edit_dir_update_error, "u_fail") \
EM(afs_edit_dir_update_inval, "u_invl") \