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ksmbd: preserve DOS attributes across truncating opens

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An existing file can be opened with a truncating create request that
supplies FileAttributes.  Do not reset its cached DOS attributes while
opening it.  After a successful truncation, apply the requested attributes
and store them in the DOS attribute xattr.

This preserves READONLY when a truncating open requests that attribute.

Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
This commit is contained in:
Namjae Jeon 2026-07-12 20:20:37 +09:00
parent dd56221217
commit 125c471ca9
1 changed files with 8 additions and 1 deletions
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9
fs/smb/server/smb2pdu.c
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@ -3395,6 +3395,7 @@ int smb2_open(struct ksmbd_work *work)
u64 time, alloc_size = 0;
umode_t posix_mode = 0;
__le32 daccess, maximal_access = 0;
u32 dos_attr;
int iov_len = 0;
ksmbd_debug(SMB, "Received smb2 create request\n");
@ -4205,12 +4206,18 @@ int smb2_open(struct ksmbd_work *work)
fp->change_time = ksmbd_UnixTimeToNT(stat.ctime);
fp->allocation_size = S_ISDIR(stat.mode) ? 0 :
(alloc_size ?: stat.blocks << 9);
if (req->FileAttributes || fp->f_ci->m_fattr == 0)
if (created || fp->f_ci->m_fattr == 0)
fp->f_ci->m_fattr =
cpu_to_le32(smb2_get_dos_mode(&stat, le32_to_cpu(req->FileAttributes)));
if (!created)
smb2_update_xattrs(tcon, &path, fp);
if (need_truncate && req->FileAttributes) {
dos_attr = le32_to_cpu(req->FileAttributes);
fp->f_ci->m_fattr =
cpu_to_le32(smb2_get_dos_mode(&stat, dos_attr));
smb2_new_xattrs(tcon, &path, fp);
}
ksmbd_vfs_update_compressed_fattr(path.dentry, &fp->f_ci->m_fattr);