cifs: cache FILE_ALL_INFO for the shared root handle

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When we open the shared root handle also ask for FILE_ALL_INFORMATION since
we can do this at zero cost as part of a compound.
Cache this information as long as the lease is held and return and serve any
future requests from cache.

This allows us to serve "stat /<mountpoint>" directly from cache and avoid
a network roundtrip.  Since clients often want to do this quite a lot
this improve performance slightly.

As an example: xfstest generic/533 performs 43 stat operations on the root
of the share while it is run. Which are eliminated with this patch.

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>

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Ronnie Sahlberg 2019-03-12 13:58:31 +10:00 • committed by Steve French

parent ab7b10cf4f

commit b0f6df737a

5 changed files with 118 additions and 28 deletions

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3

fs/cifs/cifsglob.h

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15

fs/cifs/smb2inode.c

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111

fs/cifs/smb2ops.c

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12

fs/cifs/smb2pdu.c

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3

fs/cifs/smb2proto.h

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