nfsd4: acquire only one lease per file

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Instead of acquiring one lease each time another client opens a file,
nfsd can acquire just one lease to represent all of them, and reference
count it to determine when to release it.

This fixes a regression introduced by
c45821d263 "locks: eliminate fl_mylease
callback": after that patch, only the struct file * is used to determine
who owns a given lease.  But since we recently converted the server to
share a single struct file per open, if we acquire multiple leases on
the same file from nfsd, it then becomes impossible on unlocking a lease
to determine which of those leases (all of whom share the same struct
file *) we meant to remove.

Thanks to Takashi Iwai <tiwai@suse.de> for catching a bug in a previous
version of this patch.

Tested-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

...

This commit is contained in:

J. Bruce Fields 2011-01-31 19:20:39 -05:00

parent 5d926e8c2f

commit acfdf5c383

2 changed files with 58 additions and 42 deletions

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95

fs/nfsd/nfs4state.c

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5

fs/nfsd/state.h

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