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| author | Trond Myklebust <trond.myklebust@primarydata.com> | 2015-02-26 17:42:42 -0500 |
|---|---|---|
| committer | Trond Myklebust <trond.myklebust@primarydata.com> | 2015-03-01 23:23:05 -0500 |
| commit | 140e049c64ce848392adbf4678983ecc76888dde (patch) | |
| tree | 1a278473e70aec757b36a2a2b4d7382e52f7b5b8 | |
| parent | aa5accea404b2b92d39c1924cfeb90f6082f6389 (diff) | |
| download | lwn-140e049c64ce848392adbf4678983ecc76888dde.tar.gz lwn-140e049c64ce848392adbf4678983ecc76888dde.zip | |
NFS: Add a helper to set attribute barriers
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Tested-by: Chuck Lever <chuck.lever@oracle.com>
| -rw-r--r-- | fs/nfs/inode.c | 16 | ||||
| -rw-r--r-- | include/linux/nfs_fs.h | 1 |
2 files changed, 17 insertions, 0 deletions
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c index 83107be3dd01..b0cbc1ba82da 100644 --- a/fs/nfs/inode.c +++ b/fs/nfs/inode.c @@ -1260,6 +1260,22 @@ void nfs_fattr_init(struct nfs_fattr *fattr) } EXPORT_SYMBOL_GPL(nfs_fattr_init); +/** + * nfs_fattr_set_barrier + * @fattr: attributes + * + * Used to set a barrier after an attribute was updated. This + * barrier ensures that older attributes from RPC calls that may + * have raced with our update cannot clobber these new values. + * Note that you are still responsible for ensuring that other + * operations which change the attribute on the server do not + * collide. + */ +void nfs_fattr_set_barrier(struct nfs_fattr *fattr) +{ + fattr->gencount = nfs_inc_attr_generation_counter(); +} + struct nfs_fattr *nfs_alloc_fattr(void) { struct nfs_fattr *fattr; diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h index 2f77e0c651c8..3a4ffb5856cd 100644 --- a/include/linux/nfs_fs.h +++ b/include/linux/nfs_fs.h @@ -369,6 +369,7 @@ extern struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ct extern void nfs_put_lock_context(struct nfs_lock_context *l_ctx); extern u64 nfs_compat_user_ino64(u64 fileid); extern void nfs_fattr_init(struct nfs_fattr *fattr); +extern void nfs_fattr_set_barrier(struct nfs_fattr *fattr); extern unsigned long nfs_inc_attr_generation_counter(void); extern struct nfs_fattr *nfs_alloc_fattr(void); |