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nfsd4: clean up downgrading code 

In response to some review comments, get rid of the somewhat obscure
for-loop with bitops, and improve a comment.

Reported-by: Steve Dickson <steved@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
J. Bruce Fields 2011-09-28 11:37:56 -04:00
parent 71c3bcd713
commit 6409a5a65d
2 changed files with 27 additions and 12 deletions
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31
fs/nfsd/nfs4state.c
View File

@ -3523,16 +3523,29 @@ nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
return status;
}
static inline void nfs4_file_downgrade(struct nfs4_ol_stateid *stp, unsigned int to_access)
static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access)
{
int i;
if (!test_bit(access, &stp->st_access_bmap))
return;
nfs4_file_put_access(stp->st_file, nfs4_access_to_omode(access));
__clear_bit(access, &stp->st_access_bmap);
}
for (i = 1; i < 4; i++) {
if (test_bit(i, &stp->st_access_bmap)
&& ((i & to_access) != i)) {
nfs4_file_put_access(stp->st_file, nfs4_access_to_omode(i));
__clear_bit(i, &stp->st_access_bmap);
}
static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access)
{
switch (to_access) {
case NFS4_SHARE_ACCESS_READ:
nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE);
nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
break;
case NFS4_SHARE_ACCESS_WRITE:
nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ);
nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
break;
case NFS4_SHARE_ACCESS_BOTH:
break;
default:
BUG();
}
}
@ -3578,7 +3591,7 @@ nfsd4_open_downgrade(struct svc_rqst *rqstp,
stp->st_deny_bmap, od->od_share_deny);
goto out;
}
nfs4_file_downgrade(stp, od->od_share_access);
nfs4_stateid_downgrade(stp, od->od_share_access);
reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);

8
fs/nfsd/state.h
View File

@ -403,9 +403,11 @@ struct nfs4_file {
/* One each for O_RDONLY, O_WRONLY, O_RDWR: */
struct file * fi_fds[3];
/*
* Each open or lock stateid contributes 1 to either
* fi_access[O_RDONLY], fi_access[O_WRONLY], or both, depending
* on open or lock mode:
* Each open or lock stateid contributes 0-4 to the counts
* below depending on which bits are set in st_access_bitmap:
* 1 to fi_access[O_RDONLY] if NFS4_SHARE_ACCES_READ is set
* + 1 to fi_access[O_WRONLY] if NFS4_SHARE_ACCESS_WRITE is set
* + 1 to both of the above if NFS4_SHARE_ACCESS_BOTH is set.
*/
atomic_t fi_access[2];
struct file *fi_deleg_file;