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Coda: add spin lock to protect accesses to struct coda_inode_info.

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We mostly need it to protect cached user permissions. The c_flags field
is advisory, reading the wrong value is harmless and in the worst case
we hit a slow path where we have to make an extra upcall to the
userspace cache manager when revalidating a dentry or inode.

Signed-off-by: Yoshihisa Abe <yoshiabe@cs.cmu.edu>
Signed-off-by: Jan Harkes <jaharkes@cs.cmu.edu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Yoshihisa Abe 2010-10-25 02:03:44 -04:00 • committed by Linus Torvalds
parent 3a99c63190
commit b5ce1d83a6
7 changed files with 58 additions and 17 deletions
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6
include/linux/coda_linux.h
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@ -89,7 +89,11 @@ static __inline__ char *coda_i2s(struct inode *inode)
/* this will not zap the inode away */
static __inline__ void coda_flag_inode(struct inode *inode, int flag)
{
ITOC(inode)->c_flags |= flag;
struct coda_inode_info *cii = ITOC(inode);
spin_lock(&cii->c_lock);
cii->c_flags |= flag;
spin_unlock(&cii->c_lock);
}
#endif