From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Aurelien Aptel <aaptel@suse.com>,
Shyam Prasad N <nspmangalore@gmail.com>,
Steve French <stfrench@microsoft.com>
Subject: [PATCH 4.19 21/38] cifs: report error instead of invalid when revalidating a dentry fails
Date: Mon, 8 Feb 2021 16:01:08 +0100 [thread overview]
Message-ID: <20210208145807.002040003@linuxfoundation.org> (raw)
In-Reply-To: <20210208145806.141056364@linuxfoundation.org>
From: Aurelien Aptel <aaptel@suse.com>
commit 21b200d091826a83aafc95d847139b2b0582f6d1 upstream.
Assuming
- //HOST/a is mounted on /mnt
- //HOST/b is mounted on /mnt/b
On a slow connection, running 'df' and killing it while it's
processing /mnt/b can make cifs_get_inode_info() returns -ERESTARTSYS.
This triggers the following chain of events:
=> the dentry revalidation fail
=> dentry is put and released
=> superblock associated with the dentry is put
=> /mnt/b is unmounted
This patch makes cifs_d_revalidate() return the error instead of 0
(invalid) when cifs_revalidate_dentry() fails, except for ENOENT (file
deleted) and ESTALE (file recreated).
Signed-off-by: Aurelien Aptel <aaptel@suse.com>
Suggested-by: Shyam Prasad N <nspmangalore@gmail.com>
Reviewed-by: Shyam Prasad N <nspmangalore@gmail.com>
CC: stable@vger.kernel.org
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/cifs/dir.c | 22 ++++++++++++++++++++--
1 file changed, 20 insertions(+), 2 deletions(-)
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -840,6 +840,7 @@ static int
cifs_d_revalidate(struct dentry *direntry, unsigned int flags)
{
struct inode *inode;
+ int rc;
if (flags & LOOKUP_RCU)
return -ECHILD;
@@ -849,8 +850,25 @@ cifs_d_revalidate(struct dentry *direntr
if ((flags & LOOKUP_REVAL) && !CIFS_CACHE_READ(CIFS_I(inode)))
CIFS_I(inode)->time = 0; /* force reval */
- if (cifs_revalidate_dentry(direntry))
- return 0;
+ rc = cifs_revalidate_dentry(direntry);
+ if (rc) {
+ cifs_dbg(FYI, "cifs_revalidate_dentry failed with rc=%d", rc);
+ switch (rc) {
+ case -ENOENT:
+ case -ESTALE:
+ /*
+ * Those errors mean the dentry is invalid
+ * (file was deleted or recreated)
+ */
+ return 0;
+ default:
+ /*
+ * Otherwise some unexpected error happened
+ * report it as-is to VFS layer
+ */
+ return rc;
+ }
+ }
else {
/*
* If the inode wasn't known to be a dfs entry when
next prev parent reply other threads:[~2021-02-08 15:14 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-08 15:00 [PATCH 4.19 00/38] 4.19.175-rc1 review Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 4.19 01/38] USB: serial: cp210x: add pid/vid for WSDA-200-USB Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 4.19 02/38] USB: serial: cp210x: add new VID/PID for supporting Teraoka AD2000 Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 4.19 03/38] USB: serial: option: Adding support for Cinterion MV31 Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 4.19 04/38] elfcore: fix building with clang Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 4.19 05/38] Input: i8042 - unbreak Pegatron C15B Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 4.19 06/38] rxrpc: Fix deadlock around release of dst cached on udp tunnel Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 4.19 07/38] arm64: dts: ls1046a: fix dcfg address range Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 4.19 08/38] net: lapb: Copy the skb before sending a packet Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 4.19 09/38] net: mvpp2: TCAM entry enable should be written after SRAM data Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 4.19 10/38] memblock: do not start bottom-up allocations with kernel_end Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 4.19 11/38] USB: gadget: legacy: fix an error code in eth_bind() Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 4.19 12/38] USB: usblp: dont call usb_set_interface if theres a single alt Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.19 13/38] usb: renesas_usbhs: Clear pipe running flag in usbhs_pkt_pop() Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.19 14/38] usb: dwc2: Fix endpoint direction check in ep_from_windex Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.19 15/38] usb: dwc3: fix clock issue during resume in OTG mode Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.19 16/38] ovl: fix dentry leak in ovl_get_redirect Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.19 17/38] mac80211: fix station rate table updates on assoc Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.19 18/38] kretprobe: Avoid re-registration of the same kretprobe earlier Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.19 19/38] genirq/msi: Activate Multi-MSI early when MSI_FLAG_ACTIVATE_EARLY is set Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.19 20/38] xhci: fix bounce buffer usage for non-sg list case Greg Kroah-Hartman
2021-02-08 15:01 ` Greg Kroah-Hartman [this message]
2021-02-08 15:01 ` [PATCH 4.19 22/38] smb3: Fix out-of-bounds bug in SMB2_negotiate() Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.19 23/38] mmc: core: Limit retries when analyse of SDIO tuples fails Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.19 24/38] nvme-pci: avoid the deepest sleep state on Kingston A2000 SSDs Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.19 25/38] KVM: SVM: Treat SVM as unsupported when running as an SEV guest Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.19 26/38] ARM: footbridge: fix dc21285 PCI configuration accessors Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.19 27/38] mm: hugetlbfs: fix cannot migrate the fallocated HugeTLB page Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.19 28/38] mm: hugetlb: fix a race between freeing and dissolving the page Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.19 29/38] mm: hugetlb: fix a race between isolating and freeing page Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.19 30/38] mm: hugetlb: remove VM_BUG_ON_PAGE from page_huge_active Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.19 31/38] mm: thp: fix MADV_REMOVE deadlock on shmem THP Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.19 32/38] x86/build: Disable CET instrumentation in the kernel Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.19 33/38] x86/apic: Add extra serialization for non-serializing MSRs Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.19 34/38] Input: xpad - sync supported devices with fork on GitHub Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.19 35/38] iommu/vt-d: Do not use flush-queue when caching-mode is on Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.19 36/38] md: Set prev_flush_start and flush_bio in an atomic way Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.19 37/38] net: ip_tunnel: fix mtu calculation Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.19 38/38] net: dsa: mv88e6xxx: override existent unicast portvec in port_fdb_add Greg Kroah-Hartman
2021-02-08 18:34 ` [PATCH 4.19 00/38] 4.19.175-rc1 review Pavel Machek
2021-02-08 20:42 ` Shuah Khan
2021-02-09 15:02 ` Naresh Kamboju
2021-02-09 18:11 ` Guenter Roeck
2021-02-10 1:16 ` Ross Schmidt
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