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smb3: improve handling of share deleted (and share recreated) 

When a share is deleted, returning EIO is confusing and no useful
information is logged.  Improve the handling of this case by
at least logging a better error for this (and also mapping the error
differently to EREMCHG).  See e.g. the new messages that would be logged:

[55243.639530] server share \\192.168.1.219\scratch deleted
[55243.642568] CIFS VFS: \\192.168.1.219\scratch BAD_NETWORK_NAME: \\192.168.1.219\scratch

In addition for the case where a share is deleted and then recreated
with the same name, have now fixed that so it works. This is sometimes
done for example, because the admin had to move a share to a different,
bigger local drive when a share is running low on space.

Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
alistair/sunxi64-5.4-dsi
Steve French 2019-09-11 00:07:36 -05:00
parent 1b63f1840e
commit 7dcc82c2df
4 changed files with 24 additions and 2 deletions
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6
fs/cifs/smb2inode.c
View File

@ -335,6 +335,12 @@ smb2_compound_op(const unsigned int xid, struct cifs_tcon *tcon,
cifsFileInfo_put(cfile);
SMB2_open_free(&rqst[0]);
if (rc == -EREMCHG) {
printk_once(KERN_WARNING "server share %s deleted\n",
tcon->treeName);
tcon->need_reconnect = true;
}
switch (command) {
case SMB2_OP_QUERY_INFO:
if (rc == 0) {

2
fs/cifs/smb2maperror.c
View File

@ -511,7 +511,7 @@ static const struct status_to_posix_error smb2_error_map_table[] = {
{STATUS_PRINT_QUEUE_FULL, -EIO, "STATUS_PRINT_QUEUE_FULL"},
{STATUS_NO_SPOOL_SPACE, -EIO, "STATUS_NO_SPOOL_SPACE"},
{STATUS_PRINT_CANCELLED, -EIO, "STATUS_PRINT_CANCELLED"},
{STATUS_NETWORK_NAME_DELETED, -EIO, "STATUS_NETWORK_NAME_DELETED"},
{STATUS_NETWORK_NAME_DELETED, -EREMCHG, "STATUS_NETWORK_NAME_DELETED"},
{STATUS_NETWORK_ACCESS_DENIED, -EACCES, "STATUS_NETWORK_ACCESS_DENIED"},
{STATUS_BAD_DEVICE_TYPE, -EIO, "STATUS_BAD_DEVICE_TYPE"},
{STATUS_BAD_NETWORK_NAME, -ENOENT, "STATUS_BAD_NETWORK_NAME"},

13
fs/cifs/smb2ops.c
View File

@ -741,8 +741,14 @@ int open_shroot(unsigned int xid, struct cifs_tcon *tcon, struct cifs_fid *pfid)
/* Cached root is still invalid, continue normaly */
if (rc)
if (rc) {
if (rc == -EREMCHG) {
tcon->need_reconnect = true;
printk_once(KERN_WARNING "server share %s deleted\n",
tcon->treeName);
}
goto oshr_exit;
}
o_rsp = (struct smb2_create_rsp *)rsp_iov[0].iov_base;
oparms.fid->persistent_fid = o_rsp->PersistentFileId;
@ -2237,6 +2243,11 @@ smb2_query_info_compound(const unsigned int xid, struct cifs_tcon *tcon,
resp_buftype, rsp_iov);
if (rc) {
free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
if (rc == -EREMCHG) {
tcon->need_reconnect = true;
printk_once(KERN_WARNING "server share %s deleted\n",
tcon->treeName);
}
goto qic_exit;
}
*rsp = rsp_iov[1];

5
fs/cifs/smb2pdu.c
View File

@ -2595,6 +2595,11 @@ SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
}
trace_smb3_open_err(xid, tcon->tid, ses->Suid,
oparms->create_options, oparms->desired_access, rc);
if (rc == -EREMCHG) {
printk_once(KERN_WARNING "server share %s deleted\n",
tcon->treeName);
tcon->need_reconnect = true;
}
goto creat_exit;
} else
trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,