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CIFS: Force reval dentry if LOOKUP_REVAL flag is set 

Mark inode for force revalidation if LOOKUP_REVAL flag is set.
This tells the client to actually send a QueryInfo request to
the server to obtain the latest metadata in case a directory
or a file were changed remotely. Only do that if the client
doesn't have a lease for the file to avoid unneeded round
trips to the server.

Cc: <stable@vger.kernel.org>
Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Pavel Shilovsky 2019-09-30 10:06:20 -07:00 committed by Steve French
parent c82e5ac7fe
commit 0b3d0ef984
1 changed files with 7 additions and 1 deletions
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8
fs/cifs/dir.c
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@ -738,10 +738,16 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
static int static int
cifs_d_revalidate(struct dentry *direntry, unsigned int flags) cifs_d_revalidate(struct dentry *direntry, unsigned int flags)
{ {
struct inode *inode;
if (flags & LOOKUP_RCU) if (flags & LOOKUP_RCU)
return -ECHILD; return -ECHILD;
if (d_really_is_positive(direntry)) { if (d_really_is_positive(direntry)) {
inode = d_inode(direntry);
if ((flags & LOOKUP_REVAL) && !CIFS_CACHE_READ(CIFS_I(inode)))
CIFS_I(inode)->time = 0; /* force reval */
if (cifs_revalidate_dentry(direntry)) if (cifs_revalidate_dentry(direntry))
return 0; return 0;
else { else {
@ -752,7 +758,7 @@ cifs_d_revalidate(struct dentry *direntry, unsigned int flags)
* attributes will have been updated by * attributes will have been updated by
* cifs_revalidate_dentry(). * cifs_revalidate_dentry().
*/ */
if (IS_AUTOMOUNT(d_inode(direntry)) && if (IS_AUTOMOUNT(inode) &&
!(direntry->d_flags & DCACHE_NEED_AUTOMOUNT)) { !(direntry->d_flags & DCACHE_NEED_AUTOMOUNT)) {
spin_lock(&direntry->d_lock); spin_lock(&direntry->d_lock);
direntry->d_flags |= DCACHE_NEED_AUTOMOUNT; direntry->d_flags |= DCACHE_NEED_AUTOMOUNT;