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| author | Yoshihisa Abe <yoshiabe@cs.cmu.edu> | 2010-10-25 02:03:44 -0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-10-25 08:02:40 -0700 |
| commit | b5ce1d83a62fc109d8e815b1fc71dcdb0d26bc49 (patch) | |
| tree | ea537c1b6436c36bee3b33d8b4f750124fd7d661 /fs/coda/dir.c | |
| parent | 3a99c6319064af3f2e18eb929f638d555dbf7a62 (diff) | |
| download | linux-stable-b5ce1d83a62fc109d8e815b1fc71dcdb0d26bc49.tar.gz linux-stable-b5ce1d83a62fc109d8e815b1fc71dcdb0d26bc49.tar.bz2 linux-stable-b5ce1d83a62fc109d8e815b1fc71dcdb0d26bc49.zip | |
Coda: add spin lock to protect accesses to struct coda_inode_info.
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>
Diffstat (limited to 'fs/coda/dir.c')
| -rw-r--r-- | fs/coda/dir.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/coda/dir.c b/fs/coda/dir.c index ccd98b0f2b0b..69fbbea75f1b 100644 --- a/fs/coda/dir.c +++ b/fs/coda/dir.c @@ -18,6 +18,7 @@ #include <linux/errno.h> #include <linux/string.h> #include <linux/smp_lock.h> +#include <linux/spinlock.h> #include <asm/uaccess.h> @@ -617,7 +618,9 @@ static int coda_dentry_revalidate(struct dentry *de, struct nameidata *nd) goto out; /* clear the flags. */ + spin_lock(&cii->c_lock); cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH); + spin_unlock(&cii->c_lock); bad: unlock_kernel(); @@ -691,7 +694,10 @@ int coda_revalidate_inode(struct dentry *dentry) goto return_bad; coda_flag_inode_children(inode, C_FLUSH); + + spin_lock(&cii->c_lock); cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH); + spin_unlock(&cii->c_lock); } ok: |