diff options
author | Chuck Lever <cel@citi.umich.edu> | 2005-08-18 14:24:11 -0400 |
---|---|---|
committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-08-18 15:53:56 -0400 |
commit | 412d582ec1dd59aab2353f8cb7e74f2c79cd20b9 (patch) | |
tree | 9088c5e29cbd4b33e907a7b5f9a950dd0dce36c1 /fs | |
parent | 5529680981807b44abf3be30fb6d612ff04f68ff (diff) |
[PATCH] NFS: use atomic bitops to manipulate flags in nfsi->flags
Introduce atomic bitops to manipulate the bits in the nfs_inode structure's
"flags" field.
Using bitops means we can use a generic wait_on_bit call instead of an ad hoc
locking scheme in fs/nfs/inode.c, so we can remove the "nfs_i_wait" field from
nfs_inode at the same time.
The other new flags field will continue to use bitmask and logic AND and OR.
This permits several flags to be set at the same time efficiently. The
following patch adds a spin lock to protect these flags, and this spin lock
will later cover other fields in the nfs_inode structure, amortizing the cost
of using this type of serialization.
Test plan:
Millions of fsx ops on SMP clients.
Signed-off-by: Chuck Lever <cel@netapp.com>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs')
-rw-r--r-- | fs/nfs/dir.c | 4 | ||||
-rw-r--r-- | fs/nfs/inode.c | 69 |
2 files changed, 45 insertions, 28 deletions
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c index 5732e13cd0d..27cf5577f23 100644 --- a/fs/nfs/dir.c +++ b/fs/nfs/dir.c | |||
@@ -182,7 +182,7 @@ int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page *page) | |||
182 | /* We requested READDIRPLUS, but the server doesn't grok it */ | 182 | /* We requested READDIRPLUS, but the server doesn't grok it */ |
183 | if (error == -ENOTSUPP && desc->plus) { | 183 | if (error == -ENOTSUPP && desc->plus) { |
184 | NFS_SERVER(inode)->caps &= ~NFS_CAP_READDIRPLUS; | 184 | NFS_SERVER(inode)->caps &= ~NFS_CAP_READDIRPLUS; |
185 | NFS_FLAGS(inode) &= ~NFS_INO_ADVISE_RDPLUS; | 185 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode)); |
186 | desc->plus = 0; | 186 | desc->plus = 0; |
187 | goto again; | 187 | goto again; |
188 | } | 188 | } |
@@ -545,7 +545,7 @@ static int nfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |||
545 | break; | 545 | break; |
546 | } | 546 | } |
547 | if (res == -ETOOSMALL && desc->plus) { | 547 | if (res == -ETOOSMALL && desc->plus) { |
548 | NFS_FLAGS(inode) &= ~NFS_INO_ADVISE_RDPLUS; | 548 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode)); |
549 | nfs_zap_caches(inode); | 549 | nfs_zap_caches(inode); |
550 | desc->plus = 0; | 550 | desc->plus = 0; |
551 | desc->entry->eof = 0; | 551 | desc->entry->eof = 0; |
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c index 62218455351..ee27578277f 100644 --- a/fs/nfs/inode.c +++ b/fs/nfs/inode.c | |||
@@ -739,7 +739,7 @@ nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr) | |||
739 | inode->i_fop = &nfs_dir_operations; | 739 | inode->i_fop = &nfs_dir_operations; |
740 | if (nfs_server_capable(inode, NFS_CAP_READDIRPLUS) | 740 | if (nfs_server_capable(inode, NFS_CAP_READDIRPLUS) |
741 | && fattr->size <= NFS_LIMIT_READDIRPLUS) | 741 | && fattr->size <= NFS_LIMIT_READDIRPLUS) |
742 | NFS_FLAGS(inode) |= NFS_INO_ADVISE_RDPLUS; | 742 | set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode)); |
743 | } else if (S_ISLNK(inode->i_mode)) | 743 | } else if (S_ISLNK(inode->i_mode)) |
744 | inode->i_op = &nfs_symlink_inode_operations; | 744 | inode->i_op = &nfs_symlink_inode_operations; |
745 | else | 745 | else |
@@ -849,26 +849,43 @@ void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr) | |||
849 | } | 849 | } |
850 | } | 850 | } |
851 | 851 | ||
852 | static int nfs_wait_schedule(void *word) | ||
853 | { | ||
854 | if (signal_pending(current)) | ||
855 | return -ERESTARTSYS; | ||
856 | schedule(); | ||
857 | return 0; | ||
858 | } | ||
859 | |||
852 | /* | 860 | /* |
853 | * Wait for the inode to get unlocked. | 861 | * Wait for the inode to get unlocked. |
854 | * (Used for NFS_INO_LOCKED and NFS_INO_REVALIDATING). | ||
855 | */ | 862 | */ |
856 | static int | 863 | static int nfs_wait_on_inode(struct inode *inode) |
857 | nfs_wait_on_inode(struct inode *inode, int flag) | ||
858 | { | 864 | { |
859 | struct rpc_clnt *clnt = NFS_CLIENT(inode); | 865 | struct rpc_clnt *clnt = NFS_CLIENT(inode); |
860 | struct nfs_inode *nfsi = NFS_I(inode); | 866 | struct nfs_inode *nfsi = NFS_I(inode); |
861 | 867 | sigset_t oldmask; | |
862 | int error; | 868 | int error; |
863 | if (!(NFS_FLAGS(inode) & flag)) | 869 | |
864 | return 0; | ||
865 | atomic_inc(&inode->i_count); | 870 | atomic_inc(&inode->i_count); |
866 | error = nfs_wait_event(clnt, nfsi->nfs_i_wait, | 871 | rpc_clnt_sigmask(clnt, &oldmask); |
867 | !(NFS_FLAGS(inode) & flag)); | 872 | error = wait_on_bit_lock(&nfsi->flags, NFS_INO_REVALIDATING, |
873 | nfs_wait_schedule, TASK_INTERRUPTIBLE); | ||
874 | rpc_clnt_sigunmask(clnt, &oldmask); | ||
868 | iput(inode); | 875 | iput(inode); |
876 | |||
869 | return error; | 877 | return error; |
870 | } | 878 | } |
871 | 879 | ||
880 | static void nfs_wake_up_inode(struct inode *inode) | ||
881 | { | ||
882 | struct nfs_inode *nfsi = NFS_I(inode); | ||
883 | |||
884 | clear_bit(NFS_INO_REVALIDATING, &nfsi->flags); | ||
885 | smp_mb__after_clear_bit(); | ||
886 | wake_up_bit(&nfsi->flags, NFS_INO_REVALIDATING); | ||
887 | } | ||
888 | |||
872 | int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) | 889 | int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
873 | { | 890 | { |
874 | struct inode *inode = dentry->d_inode; | 891 | struct inode *inode = dentry->d_inode; |
@@ -1029,18 +1046,19 @@ __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) | |||
1029 | if (NFS_STALE(inode)) | 1046 | if (NFS_STALE(inode)) |
1030 | goto out_nowait; | 1047 | goto out_nowait; |
1031 | 1048 | ||
1032 | while (NFS_REVALIDATING(inode)) { | 1049 | status = nfs_wait_on_inode(inode); |
1033 | status = nfs_wait_on_inode(inode, NFS_INO_REVALIDATING); | 1050 | if (status < 0) |
1034 | if (status < 0) | 1051 | goto out; |
1035 | goto out_nowait; | 1052 | if (NFS_STALE(inode)) { |
1036 | if (NFS_ATTRTIMEO(inode) == 0) | 1053 | status = -ESTALE; |
1037 | continue; | 1054 | /* Do we trust the cached ESTALE? */ |
1038 | if (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ATIME)) | 1055 | if (NFS_ATTRTIMEO(inode) != 0) { |
1039 | continue; | 1056 | if (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ATIME)) { |
1040 | status = NFS_STALE(inode) ? -ESTALE : 0; | 1057 | /* no */ |
1041 | goto out_nowait; | 1058 | } else |
1059 | goto out; | ||
1060 | } | ||
1042 | } | 1061 | } |
1043 | NFS_FLAGS(inode) |= NFS_INO_REVALIDATING; | ||
1044 | 1062 | ||
1045 | /* Protect against RPC races by saving the change attribute */ | 1063 | /* Protect against RPC races by saving the change attribute */ |
1046 | verifier = nfs_save_change_attribute(inode); | 1064 | verifier = nfs_save_change_attribute(inode); |
@@ -1052,7 +1070,7 @@ __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) | |||
1052 | if (status == -ESTALE) { | 1070 | if (status == -ESTALE) { |
1053 | nfs_zap_caches(inode); | 1071 | nfs_zap_caches(inode); |
1054 | if (!S_ISDIR(inode->i_mode)) | 1072 | if (!S_ISDIR(inode->i_mode)) |
1055 | NFS_FLAGS(inode) |= NFS_INO_STALE; | 1073 | set_bit(NFS_INO_STALE, &NFS_FLAGS(inode)); |
1056 | } | 1074 | } |
1057 | goto out; | 1075 | goto out; |
1058 | } | 1076 | } |
@@ -1083,9 +1101,9 @@ __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) | |||
1083 | inode->i_sb->s_id, | 1101 | inode->i_sb->s_id, |
1084 | (long long)NFS_FILEID(inode)); | 1102 | (long long)NFS_FILEID(inode)); |
1085 | 1103 | ||
1086 | out: | 1104 | out: |
1087 | NFS_FLAGS(inode) &= ~NFS_INO_REVALIDATING; | 1105 | nfs_wake_up_inode(inode); |
1088 | wake_up(&nfsi->nfs_i_wait); | 1106 | |
1089 | out_nowait: | 1107 | out_nowait: |
1090 | unlock_kernel(); | 1108 | unlock_kernel(); |
1091 | return status; | 1109 | return status; |
@@ -1404,7 +1422,7 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr, unsign | |||
1404 | */ | 1422 | */ |
1405 | nfs_invalidate_inode(inode); | 1423 | nfs_invalidate_inode(inode); |
1406 | out_err: | 1424 | out_err: |
1407 | NFS_FLAGS(inode) |= NFS_INO_STALE; | 1425 | set_bit(NFS_INO_STALE, &NFS_FLAGS(inode)); |
1408 | return -ESTALE; | 1426 | return -ESTALE; |
1409 | } | 1427 | } |
1410 | 1428 | ||
@@ -1996,7 +2014,6 @@ static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) | |||
1996 | nfsi->ndirty = 0; | 2014 | nfsi->ndirty = 0; |
1997 | nfsi->ncommit = 0; | 2015 | nfsi->ncommit = 0; |
1998 | nfsi->npages = 0; | 2016 | nfsi->npages = 0; |
1999 | init_waitqueue_head(&nfsi->nfs_i_wait); | ||
2000 | nfs4_init_once(nfsi); | 2017 | nfs4_init_once(nfsi); |
2001 | } | 2018 | } |
2002 | } | 2019 | } |