ksmbd: supersede disconnected delete-on-close durable handle

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A durable handle opened with FILE_DELETE_ON_CLOSE is preserved across a
disconnect so it can be reclaimed by a durable reconnect.
smb2.durable-open.delete_on_close2 disconnects such a handle and then
reconnects it, expecting the reconnect to succeed.

When the client does not reconnect but instead opens the same name with a
new delete-on-close create, the preserved handle keeps the file present
with delete-on-close set. ksmbd then rejects the new open with
STATUS_ACCESS_DENIED on the file_present + FILE_DELETE_ON_CLOSE +
OPEN_IF/OVERWRITE_IF path. smb2.durable-open.delete_on_close1 expects this
open to create a fresh, empty file instead, i.e. the disconnected handle's
delete-on-close must take effect first.

Add ksmbd_close_disconnected_durable_delete_on_close(), which closes
disconnected (conn == NULL) durable handles that keep a delete-on-close
file present. The final close promotes S_DEL_ON_CLS to S_DEL_PENDING and
unlinks the file, so a re-resolved path is absent and the new open creates
it fresh. Call it from smb2_open() before the delete-on-close conflict
check, only for the conflicting open shapes. A live (connected) handle
still keeps the file and blocks the open as before.

Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>

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This commit is contained in:

Namjae Jeon 2026-06-21 19:33:03 +09:00 • committed by Steve French

parent a04159d96c

commit 166e4c0702

3 changed files with 75 additions and 0 deletions

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17

fs/smb/server/smb2pdu.c

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57

fs/smb/server/vfs_cache.c

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1

fs/smb/server/vfs_cache.h

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