From b693ba4a338da15db1db4b5ebaa36e4ab9781c82 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Sun, 9 Aug 2009 15:14:15 -0400 Subject: SUNRPC: Constify rpc_pipe_ops... Signed-off-by: Trond Myklebust --- fs/nfs/idmap.c | 2 +- include/linux/sunrpc/rpc_pipe_fs.h | 5 +++-- net/sunrpc/auth_gss/auth_gss.c | 8 ++++---- net/sunrpc/rpc_pipe.c | 7 ++++--- 4 files changed, 12 insertions(+), 10 deletions(-) diff --git a/fs/nfs/idmap.c b/fs/nfs/idmap.c index 86147b0ab2c..fae0d3e52b4 100644 --- a/fs/nfs/idmap.c +++ b/fs/nfs/idmap.c @@ -101,7 +101,7 @@ static void idmap_pipe_destroy_msg(struct rpc_pipe_msg *); static unsigned int fnvhash32(const void *, size_t); -static struct rpc_pipe_ops idmap_upcall_ops = { +static const struct rpc_pipe_ops idmap_upcall_ops = { .upcall = idmap_pipe_upcall, .downcall = idmap_pipe_downcall, .destroy_msg = idmap_pipe_destroy_msg, diff --git a/include/linux/sunrpc/rpc_pipe_fs.h b/include/linux/sunrpc/rpc_pipe_fs.h index cea764c2359..91f5b13389c 100644 --- a/include/linux/sunrpc/rpc_pipe_fs.h +++ b/include/linux/sunrpc/rpc_pipe_fs.h @@ -32,8 +32,8 @@ struct rpc_inode { wait_queue_head_t waitq; #define RPC_PIPE_WAIT_FOR_OPEN 1 int flags; - struct rpc_pipe_ops *ops; struct delayed_work queue_timeout; + const struct rpc_pipe_ops *ops; }; static inline struct rpc_inode * @@ -46,7 +46,8 @@ extern int rpc_queue_upcall(struct inode *, struct rpc_pipe_msg *); extern struct dentry *rpc_mkdir(char *, struct rpc_clnt *); extern int rpc_rmdir(struct dentry *); -extern struct dentry *rpc_mkpipe(struct dentry *, const char *, void *, struct rpc_pipe_ops *, int flags); +extern struct dentry *rpc_mkpipe(struct dentry *, const char *, void *, + const struct rpc_pipe_ops *, int flags); extern int rpc_unlink(struct dentry *); extern struct vfsmount *rpc_get_mount(void); extern void rpc_put_mount(void); diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c index 66d458fc692..23eb3864ffc 100644 --- a/net/sunrpc/auth_gss/auth_gss.c +++ b/net/sunrpc/auth_gss/auth_gss.c @@ -89,8 +89,8 @@ static struct rpc_wait_queue pipe_version_rpc_waitqueue; static DECLARE_WAIT_QUEUE_HEAD(pipe_version_waitqueue); static void gss_free_ctx(struct gss_cl_ctx *); -static struct rpc_pipe_ops gss_upcall_ops_v0; -static struct rpc_pipe_ops gss_upcall_ops_v1; +static const struct rpc_pipe_ops gss_upcall_ops_v0; +static const struct rpc_pipe_ops gss_upcall_ops_v1; static inline struct gss_cl_ctx * gss_get_ctx(struct gss_cl_ctx *ctx) @@ -1507,7 +1507,7 @@ static const struct rpc_credops gss_nullops = { .crunwrap_resp = gss_unwrap_resp, }; -static struct rpc_pipe_ops gss_upcall_ops_v0 = { +static const struct rpc_pipe_ops gss_upcall_ops_v0 = { .upcall = gss_pipe_upcall, .downcall = gss_pipe_downcall, .destroy_msg = gss_pipe_destroy_msg, @@ -1515,7 +1515,7 @@ static struct rpc_pipe_ops gss_upcall_ops_v0 = { .release_pipe = gss_pipe_release, }; -static struct rpc_pipe_ops gss_upcall_ops_v1 = { +static const struct rpc_pipe_ops gss_upcall_ops_v1 = { .upcall = gss_pipe_upcall, .downcall = gss_pipe_downcall, .destroy_msg = gss_pipe_destroy_msg, diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c index 9ced0628d69..f6f60f625e3 100644 --- a/net/sunrpc/rpc_pipe.c +++ b/net/sunrpc/rpc_pipe.c @@ -125,7 +125,7 @@ static void rpc_close_pipes(struct inode *inode) { struct rpc_inode *rpci = RPC_I(inode); - struct rpc_pipe_ops *ops; + const struct rpc_pipe_ops *ops; int need_release; mutex_lock(&inode->i_mutex); @@ -776,8 +776,9 @@ rpc_rmdir(struct dentry *dentry) * The @private argument passed here will be available to all these methods * from the file pointer, via RPC_I(file->f_dentry->d_inode)->private. */ -struct dentry * -rpc_mkpipe(struct dentry *parent, const char *name, void *private, struct rpc_pipe_ops *ops, int flags) +struct dentry *rpc_mkpipe(struct dentry *parent, const char *name, + void *private, const struct rpc_pipe_ops *ops, + int flags) { struct dentry *dentry; struct inode *dir, *inode; -- cgit v1.2.3-18-g5258 From 7364af6a2d5e708b5c6fee3cce08d1bd7b27c9f1 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Sun, 9 Aug 2009 15:14:16 -0400 Subject: SUNRPC: Allow rpc_pipefs_ops to have null values for upcall and downcall Also ensure that we use the umode_t type when appropriate... Signed-off-by: Trond Myklebust --- net/sunrpc/rpc_pipe.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c index f6f60f625e3..8fa718201e3 100644 --- a/net/sunrpc/rpc_pipe.c +++ b/net/sunrpc/rpc_pipe.c @@ -417,7 +417,7 @@ enum { struct rpc_filelist { char *name; const struct file_operations *i_fop; - int mode; + umode_t mode; }; static struct rpc_filelist files[] = { @@ -516,7 +516,7 @@ rpc_release_path(struct nameidata *nd) } static struct inode * -rpc_get_inode(struct super_block *sb, int mode) +rpc_get_inode(struct super_block *sb, umode_t mode) { struct inode *inode = new_inode(sb); if (!inode) @@ -589,7 +589,8 @@ rpc_populate(struct dentry *parent, struct inode *inode, *dir = parent->d_inode; void *private = RPC_I(dir)->private; struct dentry *dentry; - int mode, i; + umode_t mode; + int i; mutex_lock(&dir->i_mutex); for (i = start; i < eof; i++) { @@ -783,6 +784,12 @@ struct dentry *rpc_mkpipe(struct dentry *parent, const char *name, struct dentry *dentry; struct inode *dir, *inode; struct rpc_inode *rpci; + umode_t umode = S_IFIFO | S_IRUSR | S_IWUSR; + + if (ops->upcall == NULL) + umode &= ~S_IRUGO; + if (ops->downcall == NULL) + umode &= ~S_IWUGO; dentry = rpc_lookup_create(parent, name, strlen(name), 0); if (IS_ERR(dentry)) @@ -799,7 +806,7 @@ struct dentry *rpc_mkpipe(struct dentry *parent, const char *name, rpci->nkern_readwriters++; goto out; } - inode = rpc_get_inode(dir->i_sb, S_IFIFO | S_IRUSR | S_IWUSR); + inode = rpc_get_inode(dir->i_sb, umode); if (!inode) goto err_dput; inode->i_ino = iunique(dir->i_sb, 100); -- cgit v1.2.3-18-g5258 From b5bb61da2efe7519eedd6a8f3830ab33ab774b83 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Sun, 9 Aug 2009 15:14:17 -0400 Subject: SUNRPC: Clean up rpc_pipefs lookup code... Signed-off-by: Trond Myklebust --- net/sunrpc/rpc_pipe.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c index 8fa718201e3..2940b926648 100644 --- a/net/sunrpc/rpc_pipe.c +++ b/net/sunrpc/rpc_pipe.c @@ -484,12 +484,12 @@ static const struct dentry_operations rpc_dentry_operations = { .d_delete = rpc_delete_dentry, }; -static int -rpc_lookup_parent(char *path, struct nameidata *nd) +static int __rpc_lookup_path(const char *pathname, unsigned flags, + struct nameidata *nd) { struct vfsmount *mnt; - if (path[0] == '\0') + if (pathname[0] == '\0') return -ENOENT; mnt = rpc_get_mount(); @@ -499,15 +499,20 @@ rpc_lookup_parent(char *path, struct nameidata *nd) return PTR_ERR(mnt); } - if (vfs_path_lookup(mnt->mnt_root, mnt, path, LOOKUP_PARENT, nd)) { + if (vfs_path_lookup(mnt->mnt_root, mnt, pathname, flags, nd)) { printk(KERN_WARNING "%s: %s failed to find path %s\n", - __FILE__, __func__, path); + __FILE__, __func__, pathname); rpc_put_mount(); return -ENOENT; } return 0; } +static int rpc_lookup_parent(const char *pathname, struct nameidata *nd) +{ + return __rpc_lookup_path(pathname, LOOKUP_PARENT, nd); +} + static void rpc_release_path(struct nameidata *nd) { -- cgit v1.2.3-18-g5258 From 7589806e961a16449003b636b369edec537c2726 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Sun, 9 Aug 2009 15:14:17 -0400 Subject: SUNRPC: Clean up file creation code in rpc_pipefs Signed-off-by: Trond Myklebust --- net/sunrpc/rpc_pipe.c | 120 ++++++++++++++++++++++++++++++++------------------ 1 file changed, 77 insertions(+), 43 deletions(-) diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c index 2940b926648..d8c78150e9c 100644 --- a/net/sunrpc/rpc_pipe.c +++ b/net/sunrpc/rpc_pipe.c @@ -539,6 +539,68 @@ rpc_get_inode(struct super_block *sb, umode_t mode) return inode; } +static int __rpc_create_common(struct inode *dir, struct dentry *dentry, + umode_t mode, + const struct file_operations *i_fop, + void *private) +{ + struct inode *inode; + + BUG_ON(!d_unhashed(dentry)); + inode = rpc_get_inode(dir->i_sb, mode); + if (!inode) + goto out_err; + inode->i_ino = iunique(dir->i_sb, 100); + if (i_fop) + inode->i_fop = i_fop; + if (private) + rpc_inode_setowner(inode, private); + d_add(dentry, inode); + return 0; +out_err: + printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n", + __FILE__, __func__, dentry->d_name.name); + dput(dentry); + return -ENOMEM; +} + +static int __rpc_mkdir(struct inode *dir, struct dentry *dentry, + umode_t mode, + const struct file_operations *i_fop, + void *private) +{ + int err; + + err = __rpc_create_common(dir, dentry, S_IFDIR | mode, i_fop, private); + if (err) + return err; + inc_nlink(dir); + fsnotify_mkdir(dir, dentry); + return 0; +} + +static int __rpc_mkpipe(struct inode *dir, struct dentry *dentry, + umode_t mode, + const struct file_operations *i_fop, + void *private, + const struct rpc_pipe_ops *ops, + int flags) +{ + struct rpc_inode *rpci; + int err; + + err = __rpc_create_common(dir, dentry, S_IFIFO | mode, i_fop, private); + if (err) + return err; + rpci = RPC_I(dentry->d_inode); + rpci->nkern_readwriters = 1; + rpci->private = private; + rpci->flags = flags; + rpci->ops = ops; + fsnotify_create(dir, dentry); + return 0; +} + /* * FIXME: This probably has races. */ @@ -628,25 +690,6 @@ out_bad: return -ENOMEM; } -static int -__rpc_mkdir(struct inode *dir, struct dentry *dentry) -{ - struct inode *inode; - - inode = rpc_get_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO); - if (!inode) - goto out_err; - inode->i_ino = iunique(dir->i_sb, 100); - d_instantiate(dentry, inode); - inc_nlink(dir); - fsnotify_mkdir(dir, dentry); - return 0; -out_err: - printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n", - __FILE__, __func__, dentry->d_name.name); - return -ENOMEM; -} - static int __rpc_rmdir(struct inode *dir, struct dentry *dentry) { @@ -717,9 +760,9 @@ rpc_mkdir(char *path, struct rpc_clnt *rpc_client) if (IS_ERR(dentry)) return dentry; dir = nd.path.dentry->d_inode; - if ((error = __rpc_mkdir(dir, dentry)) != 0) - goto err_dput; - RPC_I(dentry->d_inode)->private = rpc_client; + error = __rpc_mkdir(dir, dentry, S_IRUGO | S_IXUGO, NULL, rpc_client); + if (error != 0) + goto out_err; error = rpc_populate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF); if (error) @@ -732,8 +775,7 @@ out: err_depopulate: rpc_depopulate(dentry, RPCAUTH_info, RPCAUTH_EOF); __rpc_rmdir(dir, dentry); -err_dput: - dput(dentry); +out_err: printk(KERN_WARNING "%s: %s() failed to create directory %s (errno = %d)\n", __FILE__, __func__, path, error); dentry = ERR_PTR(error); @@ -787,9 +829,9 @@ struct dentry *rpc_mkpipe(struct dentry *parent, const char *name, int flags) { struct dentry *dentry; - struct inode *dir, *inode; - struct rpc_inode *rpci; + struct inode *dir = parent->d_inode; umode_t umode = S_IFIFO | S_IRUSR | S_IWUSR; + int err; if (ops->upcall == NULL) umode &= ~S_IRUGO; @@ -801,7 +843,7 @@ struct dentry *rpc_mkpipe(struct dentry *parent, const char *name, return dentry; dir = parent->d_inode; if (dentry->d_inode) { - rpci = RPC_I(dentry->d_inode); + struct rpc_inode *rpci = RPC_I(dentry->d_inode); if (rpci->private != private || rpci->ops != ops || rpci->flags != flags) { @@ -811,28 +853,20 @@ struct dentry *rpc_mkpipe(struct dentry *parent, const char *name, rpci->nkern_readwriters++; goto out; } - inode = rpc_get_inode(dir->i_sb, umode); - if (!inode) - goto err_dput; - inode->i_ino = iunique(dir->i_sb, 100); - inode->i_fop = &rpc_pipe_fops; - d_instantiate(dentry, inode); - rpci = RPC_I(inode); - rpci->private = private; - rpci->flags = flags; - rpci->ops = ops; - rpci->nkern_readwriters = 1; - fsnotify_create(dir, dentry); + + err = __rpc_mkpipe(dir, dentry, umode, &rpc_pipe_fops, + private, ops, flags); + if (err) + goto out_err; dget(dentry); out: mutex_unlock(&dir->i_mutex); return dentry; -err_dput: - dput(dentry); - dentry = ERR_PTR(-ENOMEM); +out_err: + dentry = ERR_PTR(err); printk(KERN_WARNING "%s: %s() failed to create pipe %s/%s (errno = %d)\n", __FILE__, __func__, parent->d_name.name, name, - -ENOMEM); + err); goto out; } EXPORT_SYMBOL_GPL(rpc_mkpipe); -- cgit v1.2.3-18-g5258 From 810d90bc2a76ff54295cfb3aa9b165160faa47ef Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Sun, 9 Aug 2009 15:14:18 -0400 Subject: SUNRPC: Clean up rpc_unlink() Signed-off-by: Trond Myklebust --- net/sunrpc/rpc_pipe.c | 35 +++++++++++++++++++++++++++-------- 1 file changed, 27 insertions(+), 8 deletions(-) diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c index d8c78150e9c..cf30bf58bfc 100644 --- a/net/sunrpc/rpc_pipe.c +++ b/net/sunrpc/rpc_pipe.c @@ -601,6 +601,29 @@ static int __rpc_mkpipe(struct inode *dir, struct dentry *dentry, return 0; } +static int __rpc_unlink(struct inode *dir, struct dentry *dentry) +{ + int ret; + + dget(dentry); + ret = simple_unlink(dir, dentry); + d_delete(dentry); + dput(dentry); + return ret; +} + +static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry) +{ + struct inode *inode = dentry->d_inode; + struct rpc_inode *rpci = RPC_I(inode); + + rpci->nkern_readwriters--; + if (rpci->nkern_readwriters != 0) + return 0; + rpc_close_pipes(inode); + return __rpc_unlink(dir, dentry); +} + /* * FIXME: This probably has races. */ @@ -848,14 +871,15 @@ struct dentry *rpc_mkpipe(struct dentry *parent, const char *name, rpci->ops != ops || rpci->flags != flags) { dput (dentry); - dentry = ERR_PTR(-EBUSY); + err = -EBUSY; + goto out_err; } rpci->nkern_readwriters++; goto out; } err = __rpc_mkpipe(dir, dentry, umode, &rpc_pipe_fops, - private, ops, flags); + private, ops, flags); if (err) goto out_err; dget(dentry); @@ -889,12 +913,7 @@ rpc_unlink(struct dentry *dentry) parent = dget_parent(dentry); dir = parent->d_inode; mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); - if (--RPC_I(dentry->d_inode)->nkern_readwriters == 0) { - rpc_close_pipes(dentry->d_inode); - error = simple_unlink(dir, dentry); - if (!error) - d_delete(dentry); - } + error = __rpc_rmpipe(dir, dentry); dput(dentry); mutex_unlock(&dir->i_mutex); dput(parent); -- cgit v1.2.3-18-g5258 From cfeaa4a3caaf590c1fdb7a83fcd5326e7cdc70c3 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Sun, 9 Aug 2009 15:14:20 -0400 Subject: SUNRPC: Clean up rpc_lookup_create Signed-off-by: Trond Myklebust --- net/sunrpc/rpc_pipe.c | 100 +++++++++++++++++++++++++++++--------------------- 1 file changed, 59 insertions(+), 41 deletions(-) diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c index cf30bf58bfc..36338515f34 100644 --- a/net/sunrpc/rpc_pipe.c +++ b/net/sunrpc/rpc_pipe.c @@ -624,6 +624,57 @@ static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry) return __rpc_unlink(dir, dentry); } +static struct dentry *__rpc_lookup_create(struct dentry *parent, + struct qstr *name) +{ + struct dentry *dentry; + + dentry = d_lookup(parent, name); + if (!dentry) { + dentry = d_alloc(parent, name); + if (!dentry) { + dentry = ERR_PTR(-ENOMEM); + goto out_err; + } + } + if (!dentry->d_inode) + dentry->d_op = &rpc_dentry_operations; +out_err: + return dentry; +} + +static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent, + struct qstr *name) +{ + struct dentry *dentry; + + dentry = __rpc_lookup_create(parent, name); + if (dentry->d_inode == NULL) + return dentry; + dput(dentry); + return ERR_PTR(-EEXIST); +} + +static struct dentry *rpc_lookup_negative(const char *path, + struct nameidata *nd) +{ + struct inode *dir; + struct dentry *dentry; + int error; + + error = rpc_lookup_parent(path, nd); + if (error != 0) + return ERR_PTR(error); + dir = nd->path.dentry->d_inode; + mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); + dentry = __rpc_lookup_create_exclusive(nd->path.dentry, &nd->last); + if (IS_ERR(dentry)) { + mutex_unlock(&dir->i_mutex); + rpc_release_path(nd); + } + return dentry; +} + /* * FIXME: This probably has races. */ @@ -723,44 +774,6 @@ __rpc_rmdir(struct inode *dir, struct dentry *dentry) return error; } -static struct dentry * -rpc_lookup_create(struct dentry *parent, const char *name, int len, int exclusive) -{ - struct inode *dir = parent->d_inode; - struct dentry *dentry; - - mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); - dentry = lookup_one_len(name, parent, len); - if (IS_ERR(dentry)) - goto out_err; - if (!dentry->d_inode) - dentry->d_op = &rpc_dentry_operations; - else if (exclusive) { - dput(dentry); - dentry = ERR_PTR(-EEXIST); - goto out_err; - } - return dentry; -out_err: - mutex_unlock(&dir->i_mutex); - return dentry; -} - -static struct dentry * -rpc_lookup_negative(char *path, struct nameidata *nd) -{ - struct dentry *dentry; - int error; - - if ((error = rpc_lookup_parent(path, nd)) != 0) - return ERR_PTR(error); - dentry = rpc_lookup_create(nd->path.dentry, nd->last.name, nd->last.len, - 1); - if (IS_ERR(dentry)) - rpc_release_path(nd); - return dentry; -} - /** * rpc_mkdir - Create a new directory in rpc_pipefs * @path: path from the rpc_pipefs root to the new directory @@ -854,6 +867,7 @@ struct dentry *rpc_mkpipe(struct dentry *parent, const char *name, struct dentry *dentry; struct inode *dir = parent->d_inode; umode_t umode = S_IFIFO | S_IRUSR | S_IWUSR; + struct qstr q; int err; if (ops->upcall == NULL) @@ -861,10 +875,14 @@ struct dentry *rpc_mkpipe(struct dentry *parent, const char *name, if (ops->downcall == NULL) umode &= ~S_IWUGO; - dentry = rpc_lookup_create(parent, name, strlen(name), 0); + q.name = name; + q.len = strlen(name); + q.hash = full_name_hash(q.name, q.len), + + mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); + dentry = __rpc_lookup_create(parent, &q); if (IS_ERR(dentry)) - return dentry; - dir = parent->d_inode; + goto out; if (dentry->d_inode) { struct rpc_inode *rpci = RPC_I(dentry->d_inode); if (rpci->private != private || -- cgit v1.2.3-18-g5258 From ac6fecee3121a6825a01c8fda2f5cbf1ad6a3ebd Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Sun, 9 Aug 2009 15:14:20 -0400 Subject: SUNRPC: Clean up rpc_populate/depopulate Signed-off-by: Trond Myklebust --- net/sunrpc/rpc_pipe.c | 187 +++++++++++++++++++++++++++----------------------- 1 file changed, 101 insertions(+), 86 deletions(-) diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c index 36338515f34..e5f37ded156 100644 --- a/net/sunrpc/rpc_pipe.c +++ b/net/sunrpc/rpc_pipe.c @@ -401,7 +401,6 @@ static const struct file_operations rpc_info_operations = { * We have a single directory with 1 node in it. */ enum { - RPCAUTH_Root = 1, RPCAUTH_lockd, RPCAUTH_mount, RPCAUTH_nfs, @@ -415,12 +414,12 @@ enum { * Description of fs contents. */ struct rpc_filelist { - char *name; + const char *name; const struct file_operations *i_fop; umode_t mode; }; -static struct rpc_filelist files[] = { +static const struct rpc_filelist files[] = { [RPCAUTH_lockd] = { .name = "lockd", .mode = S_IFDIR | S_IRUGO | S_IXUGO, @@ -448,11 +447,11 @@ static struct rpc_filelist files[] = { }; enum { - RPCAUTH_info = 2, + RPCAUTH_info, RPCAUTH_EOF }; -static struct rpc_filelist authfiles[] = { +static const struct rpc_filelist authfiles[] = { [RPCAUTH_info] = { .name = "info", .i_fop = &rpc_info_operations, @@ -564,6 +563,20 @@ out_err: return -ENOMEM; } +static int __rpc_create(struct inode *dir, struct dentry *dentry, + umode_t mode, + const struct file_operations *i_fop, + void *private) +{ + int err; + + err = __rpc_create_common(dir, dentry, S_IFREG | mode, i_fop, private); + if (err) + return err; + fsnotify_create(dir, dentry); + return 0; +} + static int __rpc_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode, const struct file_operations *i_fop, @@ -601,6 +614,17 @@ static int __rpc_mkpipe(struct inode *dir, struct dentry *dentry, return 0; } +static int __rpc_rmdir(struct inode *dir, struct dentry *dentry) +{ + int ret; + + dget(dentry); + ret = simple_rmdir(dir, dentry); + d_delete(dentry); + dput(dentry); + return ret; +} + static int __rpc_unlink(struct inode *dir, struct dentry *dentry) { int ret; @@ -678,100 +702,96 @@ static struct dentry *rpc_lookup_negative(const char *path, /* * FIXME: This probably has races. */ -static void rpc_depopulate(struct dentry *parent, - unsigned long start, unsigned long eof) +static void __rpc_depopulate(struct dentry *parent, + const struct rpc_filelist *files, + int start, int eof) { struct inode *dir = parent->d_inode; - struct list_head *pos, *next; - struct dentry *dentry, *dvec[10]; - int n = 0; + struct dentry *dentry; + struct qstr name; + int i; - mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD); -repeat: - spin_lock(&dcache_lock); - list_for_each_safe(pos, next, &parent->d_subdirs) { - dentry = list_entry(pos, struct dentry, d_u.d_child); - if (!dentry->d_inode || - dentry->d_inode->i_ino < start || - dentry->d_inode->i_ino >= eof) + for (i = start; i < eof; i++) { + name.name = files[i].name; + name.len = strlen(files[i].name); + name.hash = full_name_hash(name.name, name.len); + dentry = d_lookup(parent, &name); + + if (dentry == NULL) continue; - spin_lock(&dentry->d_lock); - if (!d_unhashed(dentry)) { - dget_locked(dentry); - __d_drop(dentry); - spin_unlock(&dentry->d_lock); - dvec[n++] = dentry; - if (n == ARRAY_SIZE(dvec)) + if (dentry->d_inode == NULL) + goto next; + switch (dentry->d_inode->i_mode & S_IFMT) { + default: + BUG(); + case S_IFREG: + __rpc_unlink(dir, dentry); break; - } else - spin_unlock(&dentry->d_lock); - } - spin_unlock(&dcache_lock); - if (n) { - do { - dentry = dvec[--n]; - if (S_ISREG(dentry->d_inode->i_mode)) - simple_unlink(dir, dentry); - else if (S_ISDIR(dentry->d_inode->i_mode)) - simple_rmdir(dir, dentry); - d_delete(dentry); - dput(dentry); - } while (n); - goto repeat; + case S_IFDIR: + __rpc_rmdir(dir, dentry); + } +next: + dput(dentry); } +} + +static void rpc_depopulate(struct dentry *parent, + const struct rpc_filelist *files, + int start, int eof) +{ + struct inode *dir = parent->d_inode; + + mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD); + __rpc_depopulate(parent, files, start, eof); mutex_unlock(&dir->i_mutex); } -static int -rpc_populate(struct dentry *parent, - struct rpc_filelist *files, - int start, int eof) +static int rpc_populate(struct dentry *parent, + const struct rpc_filelist *files, + int start, int eof, + void *private) { - struct inode *inode, *dir = parent->d_inode; - void *private = RPC_I(dir)->private; + struct inode *dir = parent->d_inode; struct dentry *dentry; - umode_t mode; - int i; + int i, err; mutex_lock(&dir->i_mutex); for (i = start; i < eof; i++) { - dentry = d_alloc_name(parent, files[i].name); - if (!dentry) - goto out_bad; - dentry->d_op = &rpc_dentry_operations; - mode = files[i].mode; - inode = rpc_get_inode(dir->i_sb, mode); - if (!inode) { - dput(dentry); + struct qstr q; + + q.name = files[i].name; + q.len = strlen(files[i].name); + q.hash = full_name_hash(q.name, q.len); + dentry = __rpc_lookup_create_exclusive(parent, &q); + err = PTR_ERR(dentry); + if (IS_ERR(dentry)) goto out_bad; + switch (files[i].mode & S_IFMT) { + default: + BUG(); + case S_IFREG: + err = __rpc_create(dir, dentry, + files[i].mode, + files[i].i_fop, + private); + break; + case S_IFDIR: + err = __rpc_mkdir(dir, dentry, + files[i].mode, + NULL, + private); } - inode->i_ino = i; - if (files[i].i_fop) - inode->i_fop = files[i].i_fop; - if (private) - rpc_inode_setowner(inode, private); - if (S_ISDIR(mode)) - inc_nlink(dir); - d_add(dentry, inode); - fsnotify_create(dir, dentry); + if (err != 0) + goto out_bad; } mutex_unlock(&dir->i_mutex); return 0; out_bad: + __rpc_depopulate(parent, files, start, eof); mutex_unlock(&dir->i_mutex); printk(KERN_WARNING "%s: %s failed to populate directory %s\n", __FILE__, __func__, parent->d_name.name); - return -ENOMEM; -} - -static int -__rpc_rmdir(struct inode *dir, struct dentry *dentry) -{ - int error; - error = simple_rmdir(dir, dentry); - if (!error) - d_delete(dentry); - return error; + return err; } /** @@ -800,16 +820,14 @@ rpc_mkdir(char *path, struct rpc_clnt *rpc_client) if (error != 0) goto out_err; error = rpc_populate(dentry, authfiles, - RPCAUTH_info, RPCAUTH_EOF); + RPCAUTH_info, RPCAUTH_EOF, rpc_client); if (error) - goto err_depopulate; - dget(dentry); + goto err_rmdir; out: mutex_unlock(&dir->i_mutex); rpc_release_path(&nd); return dentry; -err_depopulate: - rpc_depopulate(dentry, RPCAUTH_info, RPCAUTH_EOF); +err_rmdir: __rpc_rmdir(dir, dentry); out_err: printk(KERN_WARNING "%s: %s() failed to create directory %s (errno = %d)\n", @@ -832,9 +850,8 @@ rpc_rmdir(struct dentry *dentry) parent = dget_parent(dentry); dir = parent->d_inode; mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); - rpc_depopulate(dentry, RPCAUTH_info, RPCAUTH_EOF); + rpc_depopulate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF); error = __rpc_rmdir(dir, dentry); - dput(dentry); mutex_unlock(&dir->i_mutex); dput(parent); return error; @@ -900,7 +917,6 @@ struct dentry *rpc_mkpipe(struct dentry *parent, const char *name, private, ops, flags); if (err) goto out_err; - dget(dentry); out: mutex_unlock(&dir->i_mutex); return dentry; @@ -932,7 +948,6 @@ rpc_unlink(struct dentry *dentry) dir = parent->d_inode; mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); error = __rpc_rmpipe(dir, dentry); - dput(dentry); mutex_unlock(&dir->i_mutex); dput(parent); return error; @@ -970,7 +985,7 @@ rpc_fill_super(struct super_block *sb, void *data, int silent) iput(inode); return -ENOMEM; } - if (rpc_populate(root, files, RPCAUTH_Root + 1, RPCAUTH_RootEOF)) + if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL)) goto out; sb->s_root = root; return 0; -- cgit v1.2.3-18-g5258 From bb1567491e43df4113ec8b088ff0ebc22f568bc5 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Sun, 9 Aug 2009 15:14:21 -0400 Subject: SUNRPC: rpc_pipefs cleanup Move the files[] array closer to rpc_fill_super() Signed-off-by: Trond Myklebust --- net/sunrpc/rpc_pipe.c | 80 +++++++++++++++++++++++++-------------------------- 1 file changed, 40 insertions(+), 40 deletions(-) diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c index e5f37ded156..2a4e6eb0a3e 100644 --- a/net/sunrpc/rpc_pipe.c +++ b/net/sunrpc/rpc_pipe.c @@ -397,19 +397,6 @@ static const struct file_operations rpc_info_operations = { }; -/* - * We have a single directory with 1 node in it. - */ -enum { - RPCAUTH_lockd, - RPCAUTH_mount, - RPCAUTH_nfs, - RPCAUTH_portmap, - RPCAUTH_statd, - RPCAUTH_nfsd4_cb, - RPCAUTH_RootEOF -}; - /* * Description of fs contents. */ @@ -419,33 +406,6 @@ struct rpc_filelist { umode_t mode; }; -static const struct rpc_filelist files[] = { - [RPCAUTH_lockd] = { - .name = "lockd", - .mode = S_IFDIR | S_IRUGO | S_IXUGO, - }, - [RPCAUTH_mount] = { - .name = "mount", - .mode = S_IFDIR | S_IRUGO | S_IXUGO, - }, - [RPCAUTH_nfs] = { - .name = "nfs", - .mode = S_IFDIR | S_IRUGO | S_IXUGO, - }, - [RPCAUTH_portmap] = { - .name = "portmap", - .mode = S_IFDIR | S_IRUGO | S_IXUGO, - }, - [RPCAUTH_statd] = { - .name = "statd", - .mode = S_IFDIR | S_IRUGO | S_IXUGO, - }, - [RPCAUTH_nfsd4_cb] = { - .name = "nfsd4_cb", - .mode = S_IFDIR | S_IRUGO | S_IXUGO, - }, -}; - enum { RPCAUTH_info, RPCAUTH_EOF @@ -965,6 +925,46 @@ static struct super_operations s_ops = { #define RPCAUTH_GSSMAGIC 0x67596969 +/* + * We have a single directory with 1 node in it. + */ +enum { + RPCAUTH_lockd, + RPCAUTH_mount, + RPCAUTH_nfs, + RPCAUTH_portmap, + RPCAUTH_statd, + RPCAUTH_nfsd4_cb, + RPCAUTH_RootEOF +}; + +static const struct rpc_filelist files[] = { + [RPCAUTH_lockd] = { + .name = "lockd", + .mode = S_IFDIR | S_IRUGO | S_IXUGO, + }, + [RPCAUTH_mount] = { + .name = "mount", + .mode = S_IFDIR | S_IRUGO | S_IXUGO, + }, + [RPCAUTH_nfs] = { + .name = "nfs", + .mode = S_IFDIR | S_IRUGO | S_IXUGO, + }, + [RPCAUTH_portmap] = { + .name = "portmap", + .mode = S_IFDIR | S_IRUGO | S_IXUGO, + }, + [RPCAUTH_statd] = { + .name = "statd", + .mode = S_IFDIR | S_IRUGO | S_IXUGO, + }, + [RPCAUTH_nfsd4_cb] = { + .name = "nfsd4_cb", + .mode = S_IFDIR | S_IRUGO | S_IXUGO, + }, +}; + static int rpc_fill_super(struct super_block *sb, void *data, int silent) { -- cgit v1.2.3-18-g5258 From 458adb8ba9b26bfc66593866013adbb62a1a3d2e Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Sun, 9 Aug 2009 15:14:22 -0400 Subject: SUNRPC: Rename rpc_mkdir to rpc_create_client_dir() This reflects the fact that rpc_mkdir() as it stands today, can only create a RPC client type directory. Signed-off-by: Trond Myklebust --- include/linux/sunrpc/rpc_pipe_fs.h | 5 +++-- net/sunrpc/clnt.c | 6 +++--- net/sunrpc/rpc_pipe.c | 11 +++++------ 3 files changed, 11 insertions(+), 11 deletions(-) diff --git a/include/linux/sunrpc/rpc_pipe_fs.h b/include/linux/sunrpc/rpc_pipe_fs.h index 91f5b13389c..8de0ac27649 100644 --- a/include/linux/sunrpc/rpc_pipe_fs.h +++ b/include/linux/sunrpc/rpc_pipe_fs.h @@ -44,8 +44,9 @@ RPC_I(struct inode *inode) extern int rpc_queue_upcall(struct inode *, struct rpc_pipe_msg *); -extern struct dentry *rpc_mkdir(char *, struct rpc_clnt *); -extern int rpc_rmdir(struct dentry *); +struct rpc_clnt; +extern struct dentry *rpc_create_client_dir(const char *, struct rpc_clnt *); +extern int rpc_remove_client_dir(struct dentry *); extern struct dentry *rpc_mkpipe(struct dentry *, const char *, void *, const struct rpc_pipe_ops *, int flags); extern int rpc_unlink(struct dentry *); diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c index ebfcf9b8990..6ec37701a16 100644 --- a/net/sunrpc/clnt.c +++ b/net/sunrpc/clnt.c @@ -113,7 +113,7 @@ rpc_setup_pipedir(struct rpc_clnt *clnt, char *dir_name) "%s/clnt%x", dir_name, (unsigned int)clntid++); clnt->cl_pathname[sizeof(clnt->cl_pathname) - 1] = '\0'; - clnt->cl_dentry = rpc_mkdir(clnt->cl_pathname, clnt); + clnt->cl_dentry = rpc_create_client_dir(clnt->cl_pathname, clnt); if (!IS_ERR(clnt->cl_dentry)) return 0; error = PTR_ERR(clnt->cl_dentry); @@ -232,7 +232,7 @@ static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, stru out_no_auth: if (!IS_ERR(clnt->cl_dentry)) { - rpc_rmdir(clnt->cl_dentry); + rpc_remove_client_dir(clnt->cl_dentry); rpc_put_mount(); } out_no_path: @@ -424,7 +424,7 @@ rpc_free_client(struct kref *kref) dprintk("RPC: destroying %s client for %s\n", clnt->cl_protname, clnt->cl_server); if (!IS_ERR(clnt->cl_dentry)) { - rpc_rmdir(clnt->cl_dentry); + rpc_remove_client_dir(clnt->cl_dentry); rpc_put_mount(); } if (clnt->cl_parent != clnt) { diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c index 2a4e6eb0a3e..08580bedc25 100644 --- a/net/sunrpc/rpc_pipe.c +++ b/net/sunrpc/rpc_pipe.c @@ -755,7 +755,7 @@ out_bad: } /** - * rpc_mkdir - Create a new directory in rpc_pipefs + * rpc_create_client_dir - Create a new rpc_client directory in rpc_pipefs * @path: path from the rpc_pipefs root to the new directory * @rpc_client: rpc client to associate with this directory * @@ -764,8 +764,8 @@ out_bad: * information about the client, together with any "pipes" that may * later be created using rpc_mkpipe(). */ -struct dentry * -rpc_mkdir(char *path, struct rpc_clnt *rpc_client) +struct dentry *rpc_create_client_dir(const char *path, + struct rpc_clnt *rpc_client) { struct nameidata nd; struct dentry *dentry; @@ -797,11 +797,10 @@ out_err: } /** - * rpc_rmdir - Remove a directory created with rpc_mkdir() + * rpc_remove_client_dir - Remove a directory created with rpc_create_client_dir() * @dentry: directory to remove */ -int -rpc_rmdir(struct dentry *dentry) +int rpc_remove_client_dir(struct dentry *dentry) { struct dentry *parent; struct inode *dir; -- cgit v1.2.3-18-g5258 From 7d59d1e86531a53d7648726ab8a6a670ecbd8f06 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Sun, 9 Aug 2009 15:14:23 -0400 Subject: SUNRPC: Clean up rpc_create_client_dir() Factor out the code that does lookups from the code that actually creates the directory. Signed-off-by: Trond Myklebust --- net/sunrpc/rpc_pipe.c | 83 +++++++++++++++++++++++++-------------------------- 1 file changed, 41 insertions(+), 42 deletions(-) diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c index 08580bedc25..6d152f69587 100644 --- a/net/sunrpc/rpc_pipe.c +++ b/net/sunrpc/rpc_pipe.c @@ -639,26 +639,6 @@ static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent, return ERR_PTR(-EEXIST); } -static struct dentry *rpc_lookup_negative(const char *path, - struct nameidata *nd) -{ - struct inode *dir; - struct dentry *dentry; - int error; - - error = rpc_lookup_parent(path, nd); - if (error != 0) - return ERR_PTR(error); - dir = nd->path.dentry->d_inode; - mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); - dentry = __rpc_lookup_create_exclusive(nd->path.dentry, &nd->last); - if (IS_ERR(dentry)) { - mutex_unlock(&dir->i_mutex); - rpc_release_path(nd); - } - return dentry; -} - /* * FIXME: This probably has races. */ @@ -754,44 +734,30 @@ out_bad: return err; } -/** - * rpc_create_client_dir - Create a new rpc_client directory in rpc_pipefs - * @path: path from the rpc_pipefs root to the new directory - * @rpc_client: rpc client to associate with this directory - * - * This creates a directory at the given @path associated with - * @rpc_clnt, which will contain a file named "info" with some basic - * information about the client, together with any "pipes" that may - * later be created using rpc_mkpipe(). - */ -struct dentry *rpc_create_client_dir(const char *path, - struct rpc_clnt *rpc_client) +struct dentry *rpc_mkdir_populate(struct dentry *parent, + struct qstr *name, umode_t mode, void *private) { - struct nameidata nd; struct dentry *dentry; - struct inode *dir; + struct inode *dir = parent->d_inode; int error; - dentry = rpc_lookup_negative(path, &nd); + mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); + dentry = __rpc_lookup_create_exclusive(parent, name); if (IS_ERR(dentry)) - return dentry; - dir = nd.path.dentry->d_inode; - error = __rpc_mkdir(dir, dentry, S_IRUGO | S_IXUGO, NULL, rpc_client); + goto out; + error = __rpc_mkdir(dir, dentry, mode, NULL, private); if (error != 0) goto out_err; error = rpc_populate(dentry, authfiles, - RPCAUTH_info, RPCAUTH_EOF, rpc_client); + RPCAUTH_info, RPCAUTH_EOF, private); if (error) goto err_rmdir; out: mutex_unlock(&dir->i_mutex); - rpc_release_path(&nd); return dentry; err_rmdir: __rpc_rmdir(dir, dentry); out_err: - printk(KERN_WARNING "%s: %s() failed to create directory %s (errno = %d)\n", - __FILE__, __func__, path, error); dentry = ERR_PTR(error); goto out; } @@ -913,6 +879,39 @@ rpc_unlink(struct dentry *dentry) } EXPORT_SYMBOL_GPL(rpc_unlink); +/** + * rpc_create_client_dir - Create a new rpc_client directory in rpc_pipefs + * @path: path from the rpc_pipefs root to the new directory + * @rpc_client: rpc client to associate with this directory + * + * This creates a directory at the given @path associated with + * @rpc_clnt, which will contain a file named "info" with some basic + * information about the client, together with any "pipes" that may + * later be created using rpc_mkpipe(). + */ +struct dentry *rpc_create_client_dir(const char *path, + struct rpc_clnt *rpc_client) +{ + struct nameidata nd; + struct dentry *ret; + struct inode *dir; + + ret = ERR_PTR(rpc_lookup_parent(path, &nd)); + if (IS_ERR(ret)) + goto out_err; + dir = nd.path.dentry->d_inode; + + ret = rpc_mkdir_populate(nd.path.dentry, &nd.last, + S_IRUGO | S_IXUGO, rpc_client); + rpc_release_path(&nd); + if (!IS_ERR(ret)) + return ret; +out_err: + printk(KERN_WARNING "%s: %s() failed to create directory %s (errno = %ld)\n", + __FILE__, __func__, path, PTR_ERR(ret)); + return ret; +} + /* * populate the filesystem */ -- cgit v1.2.3-18-g5258 From 7d217caca5d704e48aa5e59aba0b3ad4c7af4fd2 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Sun, 9 Aug 2009 15:14:24 -0400 Subject: SUNRPC: Replace rpc_client->cl_dentry and cl_mnt, with a cl_path Signed-off-by: Trond Myklebust --- fs/nfs/idmap.c | 4 ++-- include/linux/sunrpc/clnt.h | 4 ++-- net/sunrpc/auth_gss/auth_gss.c | 4 ++-- net/sunrpc/clnt.c | 24 ++++++++++++------------ 4 files changed, 18 insertions(+), 18 deletions(-) diff --git a/fs/nfs/idmap.c b/fs/nfs/idmap.c index fae0d3e52b4..21a84d45916 100644 --- a/fs/nfs/idmap.c +++ b/fs/nfs/idmap.c @@ -119,8 +119,8 @@ nfs_idmap_new(struct nfs_client *clp) if (idmap == NULL) return -ENOMEM; - idmap->idmap_dentry = rpc_mkpipe(clp->cl_rpcclient->cl_dentry, "idmap", - idmap, &idmap_upcall_ops, 0); + idmap->idmap_dentry = rpc_mkpipe(clp->cl_rpcclient->cl_path.dentry, + "idmap", idmap, &idmap_upcall_ops, 0); if (IS_ERR(idmap->idmap_dentry)) { error = PTR_ERR(idmap->idmap_dentry); kfree(idmap); diff --git a/include/linux/sunrpc/clnt.h b/include/linux/sunrpc/clnt.h index 37881f1a0bd..38ad162330a 100644 --- a/include/linux/sunrpc/clnt.h +++ b/include/linux/sunrpc/clnt.h @@ -17,6 +17,7 @@ #include #include #include +#include struct rpc_inode; @@ -51,8 +52,7 @@ struct rpc_clnt { int cl_nodelen; /* nodename length */ char cl_nodename[UNX_MAXNODENAME]; char cl_pathname[30];/* Path in rpc_pipe_fs */ - struct vfsmount * cl_vfsmnt; - struct dentry * cl_dentry; /* inode */ + struct path cl_path; struct rpc_clnt * cl_parent; /* Points to parent of clones */ struct rpc_rtt cl_rtt_default; struct rpc_timeout cl_timeout_default; diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c index 23eb3864ffc..fc6a43ccd95 100644 --- a/net/sunrpc/auth_gss/auth_gss.c +++ b/net/sunrpc/auth_gss/auth_gss.c @@ -777,7 +777,7 @@ gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor) * that we supported only the old pipe. So we instead create * the new pipe first. */ - gss_auth->dentry[1] = rpc_mkpipe(clnt->cl_dentry, + gss_auth->dentry[1] = rpc_mkpipe(clnt->cl_path.dentry, "gssd", clnt, &gss_upcall_ops_v1, RPC_PIPE_WAIT_FOR_OPEN); @@ -786,7 +786,7 @@ gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor) goto err_put_mech; } - gss_auth->dentry[0] = rpc_mkpipe(clnt->cl_dentry, + gss_auth->dentry[0] = rpc_mkpipe(clnt->cl_path.dentry, gss_auth->mech->gm_name, clnt, &gss_upcall_ops_v0, RPC_PIPE_WAIT_FOR_OPEN); diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c index 6ec37701a16..b3f86334630 100644 --- a/net/sunrpc/clnt.c +++ b/net/sunrpc/clnt.c @@ -99,24 +99,24 @@ rpc_setup_pipedir(struct rpc_clnt *clnt, char *dir_name) static uint32_t clntid; int error; - clnt->cl_vfsmnt = ERR_PTR(-ENOENT); - clnt->cl_dentry = ERR_PTR(-ENOENT); + clnt->cl_path.mnt = ERR_PTR(-ENOENT); + clnt->cl_path.dentry = ERR_PTR(-ENOENT); if (dir_name == NULL) return 0; - clnt->cl_vfsmnt = rpc_get_mount(); - if (IS_ERR(clnt->cl_vfsmnt)) - return PTR_ERR(clnt->cl_vfsmnt); + clnt->cl_path.mnt = rpc_get_mount(); + if (IS_ERR(clnt->cl_path.mnt)) + return PTR_ERR(clnt->cl_path.mnt); for (;;) { snprintf(clnt->cl_pathname, sizeof(clnt->cl_pathname), "%s/clnt%x", dir_name, (unsigned int)clntid++); clnt->cl_pathname[sizeof(clnt->cl_pathname) - 1] = '\0'; - clnt->cl_dentry = rpc_create_client_dir(clnt->cl_pathname, clnt); - if (!IS_ERR(clnt->cl_dentry)) + clnt->cl_path.dentry = rpc_create_client_dir(clnt->cl_pathname, clnt); + if (!IS_ERR(clnt->cl_path.dentry)) return 0; - error = PTR_ERR(clnt->cl_dentry); + error = PTR_ERR(clnt->cl_path.dentry); if (error != -EEXIST) { printk(KERN_INFO "RPC: Couldn't create pipefs entry %s, error %d\n", clnt->cl_pathname, error); @@ -231,8 +231,8 @@ static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, stru return clnt; out_no_auth: - if (!IS_ERR(clnt->cl_dentry)) { - rpc_remove_client_dir(clnt->cl_dentry); + if (!IS_ERR(clnt->cl_path.dentry)) { + rpc_remove_client_dir(clnt->cl_path.dentry); rpc_put_mount(); } out_no_path: @@ -423,8 +423,8 @@ rpc_free_client(struct kref *kref) dprintk("RPC: destroying %s client for %s\n", clnt->cl_protname, clnt->cl_server); - if (!IS_ERR(clnt->cl_dentry)) { - rpc_remove_client_dir(clnt->cl_dentry); + if (!IS_ERR(clnt->cl_path.dentry)) { + rpc_remove_client_dir(clnt->cl_path.dentry); rpc_put_mount(); } if (clnt->cl_parent != clnt) { -- cgit v1.2.3-18-g5258 From 23ac6581702ac6d029643328a7e6ea3baf834c5e Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Sun, 9 Aug 2009 15:14:25 -0400 Subject: SUNRPC: clean up rpc_setup_pipedir() There is still a little wart or two there: Since we've already got a vfsmount, we might as well pass that in to rpc_create_client_dir. Another point is that if we open code __rpc_lookup_path() here, then we can avoid looking up the entire parent directory path over and over again: it doesn't change. Also get rid of rpc_clnt->cl_pathname, since it has no users... Signed-off-by: Trond Myklebust --- include/linux/sunrpc/clnt.h | 1 - include/linux/sunrpc/rpc_pipe_fs.h | 2 +- net/sunrpc/clnt.c | 48 +++++++++++++++++++++---------- net/sunrpc/rpc_pipe.c | 58 ++------------------------------------ 4 files changed, 37 insertions(+), 72 deletions(-) diff --git a/include/linux/sunrpc/clnt.h b/include/linux/sunrpc/clnt.h index 38ad162330a..1848d44922e 100644 --- a/include/linux/sunrpc/clnt.h +++ b/include/linux/sunrpc/clnt.h @@ -51,7 +51,6 @@ struct rpc_clnt { int cl_nodelen; /* nodename length */ char cl_nodename[UNX_MAXNODENAME]; - char cl_pathname[30];/* Path in rpc_pipe_fs */ struct path cl_path; struct rpc_clnt * cl_parent; /* Points to parent of clones */ struct rpc_rtt cl_rtt_default; diff --git a/include/linux/sunrpc/rpc_pipe_fs.h b/include/linux/sunrpc/rpc_pipe_fs.h index 8de0ac27649..88332ef1e95 100644 --- a/include/linux/sunrpc/rpc_pipe_fs.h +++ b/include/linux/sunrpc/rpc_pipe_fs.h @@ -45,7 +45,7 @@ RPC_I(struct inode *inode) extern int rpc_queue_upcall(struct inode *, struct rpc_pipe_msg *); struct rpc_clnt; -extern struct dentry *rpc_create_client_dir(const char *, struct rpc_clnt *); +extern struct dentry *rpc_create_client_dir(struct dentry *, struct qstr *, struct rpc_clnt *); extern int rpc_remove_client_dir(struct dentry *); extern struct dentry *rpc_mkpipe(struct dentry *, const char *, void *, const struct rpc_pipe_ops *, int flags); diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c index b3f86334630..c1e467e1b07 100644 --- a/net/sunrpc/clnt.c +++ b/net/sunrpc/clnt.c @@ -27,6 +27,8 @@ #include #include #include +#include +#include #include #include #include @@ -97,6 +99,12 @@ static int rpc_setup_pipedir(struct rpc_clnt *clnt, char *dir_name) { static uint32_t clntid; + struct nameidata nd; + struct path path; + char name[15]; + struct qstr q = { + .name = name, + }; int error; clnt->cl_path.mnt = ERR_PTR(-ENOENT); @@ -104,26 +112,36 @@ rpc_setup_pipedir(struct rpc_clnt *clnt, char *dir_name) if (dir_name == NULL) return 0; - clnt->cl_path.mnt = rpc_get_mount(); - if (IS_ERR(clnt->cl_path.mnt)) - return PTR_ERR(clnt->cl_path.mnt); + path.mnt = rpc_get_mount(); + if (IS_ERR(path.mnt)) + return PTR_ERR(path.mnt); + error = vfs_path_lookup(path.mnt->mnt_root, path.mnt, dir_name, 0, &nd); + if (error) + goto err; for (;;) { - snprintf(clnt->cl_pathname, sizeof(clnt->cl_pathname), - "%s/clnt%x", dir_name, - (unsigned int)clntid++); - clnt->cl_pathname[sizeof(clnt->cl_pathname) - 1] = '\0'; - clnt->cl_path.dentry = rpc_create_client_dir(clnt->cl_pathname, clnt); - if (!IS_ERR(clnt->cl_path.dentry)) - return 0; - error = PTR_ERR(clnt->cl_path.dentry); + q.len = snprintf(name, sizeof(name), "clnt%x", (unsigned int)clntid++); + name[sizeof(name) - 1] = '\0'; + q.hash = full_name_hash(q.name, q.len); + path.dentry = rpc_create_client_dir(nd.path.dentry, &q, clnt); + if (!IS_ERR(path.dentry)) + break; + error = PTR_ERR(path.dentry); if (error != -EEXIST) { - printk(KERN_INFO "RPC: Couldn't create pipefs entry %s, error %d\n", - clnt->cl_pathname, error); - rpc_put_mount(); - return error; + printk(KERN_INFO "RPC: Couldn't create pipefs entry" + " %s/%s, error %d\n", + dir_name, name, error); + goto err_path_put; } } + path_put(&nd.path); + clnt->cl_path = path; + return 0; +err_path_put: + path_put(&nd.path); +err: + rpc_put_mount(); + return error; } static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, struct rpc_xprt *xprt) diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c index 6d152f69587..1613d858ba3 100644 --- a/net/sunrpc/rpc_pipe.c +++ b/net/sunrpc/rpc_pipe.c @@ -443,42 +443,6 @@ static const struct dentry_operations rpc_dentry_operations = { .d_delete = rpc_delete_dentry, }; -static int __rpc_lookup_path(const char *pathname, unsigned flags, - struct nameidata *nd) -{ - struct vfsmount *mnt; - - if (pathname[0] == '\0') - return -ENOENT; - - mnt = rpc_get_mount(); - if (IS_ERR(mnt)) { - printk(KERN_WARNING "%s: %s failed to mount " - "pseudofilesystem \n", __FILE__, __func__); - return PTR_ERR(mnt); - } - - if (vfs_path_lookup(mnt->mnt_root, mnt, pathname, flags, nd)) { - printk(KERN_WARNING "%s: %s failed to find path %s\n", - __FILE__, __func__, pathname); - rpc_put_mount(); - return -ENOENT; - } - return 0; -} - -static int rpc_lookup_parent(const char *pathname, struct nameidata *nd) -{ - return __rpc_lookup_path(pathname, LOOKUP_PARENT, nd); -} - -static void -rpc_release_path(struct nameidata *nd) -{ - path_put(&nd->path); - rpc_put_mount(); -} - static struct inode * rpc_get_inode(struct super_block *sb, umode_t mode) { @@ -889,27 +853,11 @@ EXPORT_SYMBOL_GPL(rpc_unlink); * information about the client, together with any "pipes" that may * later be created using rpc_mkpipe(). */ -struct dentry *rpc_create_client_dir(const char *path, +struct dentry *rpc_create_client_dir(struct dentry *dentry, + struct qstr *name, struct rpc_clnt *rpc_client) { - struct nameidata nd; - struct dentry *ret; - struct inode *dir; - - ret = ERR_PTR(rpc_lookup_parent(path, &nd)); - if (IS_ERR(ret)) - goto out_err; - dir = nd.path.dentry->d_inode; - - ret = rpc_mkdir_populate(nd.path.dentry, &nd.last, - S_IRUGO | S_IXUGO, rpc_client); - rpc_release_path(&nd); - if (!IS_ERR(ret)) - return ret; -out_err: - printk(KERN_WARNING "%s: %s() failed to create directory %s (errno = %ld)\n", - __FILE__, __func__, path, PTR_ERR(ret)); - return ret; + return rpc_mkdir_populate(dentry, name, S_IRUGO | S_IXUGO, rpc_client); } /* -- cgit v1.2.3-18-g5258 From e57aed77ad48d28ac617ba157ad2f665f5301b30 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Sun, 9 Aug 2009 15:14:26 -0400 Subject: SUNRPC: One more clean up for rpc_create_client_dir() In order to allow rpc_pipefs to create directories with different types of subtrees, it is useful to allow the caller to customise the subtree filling process. In order to do so, we separate out the parts which are specific to making an RPC client directory, and put them in a separate helper, then we convert the process of filling the directory contents into a callback. Signed-off-by: Trond Myklebust --- net/sunrpc/rpc_pipe.c | 78 +++++++++++++++++++++++++++++++++------------------ 1 file changed, 50 insertions(+), 28 deletions(-) diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c index 1613d858ba3..57e9cd3c49b 100644 --- a/net/sunrpc/rpc_pipe.c +++ b/net/sunrpc/rpc_pipe.c @@ -406,19 +406,6 @@ struct rpc_filelist { umode_t mode; }; -enum { - RPCAUTH_info, - RPCAUTH_EOF -}; - -static const struct rpc_filelist authfiles[] = { - [RPCAUTH_info] = { - .name = "info", - .i_fop = &rpc_info_operations, - .mode = S_IFREG | S_IRUSR, - }, -}; - struct vfsmount *rpc_get_mount(void) { int err; @@ -698,8 +685,9 @@ out_bad: return err; } -struct dentry *rpc_mkdir_populate(struct dentry *parent, - struct qstr *name, umode_t mode, void *private) +static struct dentry *rpc_mkdir_populate(struct dentry *parent, + struct qstr *name, umode_t mode, void *private, + int (*populate)(struct dentry *, void *), void *args_populate) { struct dentry *dentry; struct inode *dir = parent->d_inode; @@ -712,10 +700,11 @@ struct dentry *rpc_mkdir_populate(struct dentry *parent, error = __rpc_mkdir(dir, dentry, mode, NULL, private); if (error != 0) goto out_err; - error = rpc_populate(dentry, authfiles, - RPCAUTH_info, RPCAUTH_EOF, private); - if (error) - goto err_rmdir; + if (populate != NULL) { + error = populate(dentry, args_populate); + if (error) + goto err_rmdir; + } out: mutex_unlock(&dir->i_mutex); return dentry; @@ -726,11 +715,8 @@ out_err: goto out; } -/** - * rpc_remove_client_dir - Remove a directory created with rpc_create_client_dir() - * @dentry: directory to remove - */ -int rpc_remove_client_dir(struct dentry *dentry) +static int rpc_rmdir_depopulate(struct dentry *dentry, + void (*depopulate)(struct dentry *)) { struct dentry *parent; struct inode *dir; @@ -739,7 +725,8 @@ int rpc_remove_client_dir(struct dentry *dentry) parent = dget_parent(dentry); dir = parent->d_inode; mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); - rpc_depopulate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF); + if (depopulate != NULL) + depopulate(dentry); error = __rpc_rmdir(dir, dentry); mutex_unlock(&dir->i_mutex); dput(parent); @@ -843,6 +830,31 @@ rpc_unlink(struct dentry *dentry) } EXPORT_SYMBOL_GPL(rpc_unlink); +enum { + RPCAUTH_info, + RPCAUTH_EOF +}; + +static const struct rpc_filelist authfiles[] = { + [RPCAUTH_info] = { + .name = "info", + .i_fop = &rpc_info_operations, + .mode = S_IFREG | S_IRUSR, + }, +}; + +static int rpc_clntdir_populate(struct dentry *dentry, void *private) +{ + return rpc_populate(dentry, + authfiles, RPCAUTH_info, RPCAUTH_EOF, + private); +} + +static void rpc_clntdir_depopulate(struct dentry *dentry) +{ + rpc_depopulate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF); +} + /** * rpc_create_client_dir - Create a new rpc_client directory in rpc_pipefs * @path: path from the rpc_pipefs root to the new directory @@ -854,10 +866,20 @@ EXPORT_SYMBOL_GPL(rpc_unlink); * later be created using rpc_mkpipe(). */ struct dentry *rpc_create_client_dir(struct dentry *dentry, - struct qstr *name, - struct rpc_clnt *rpc_client) + struct qstr *name, + struct rpc_clnt *rpc_client) +{ + return rpc_mkdir_populate(dentry, name, S_IRUGO | S_IXUGO, NULL, + rpc_clntdir_populate, rpc_client); +} + +/** + * rpc_remove_client_dir - Remove a directory created with rpc_create_client_dir() + * @dentry: directory to remove + */ +int rpc_remove_client_dir(struct dentry *dentry) { - return rpc_mkdir_populate(dentry, name, S_IRUGO | S_IXUGO, rpc_client); + return rpc_rmdir_depopulate(dentry, rpc_clntdir_depopulate); } /* -- cgit v1.2.3-18-g5258 From 2da8ca26c6bfad685bfddf39728eac1c83906aa9 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Sun, 9 Aug 2009 15:14:26 -0400 Subject: NFSD: Clean up the idmapper warning... What part of 'internal use' is so hard to understand? Signed-off-by: Trond Myklebust --- fs/nfsd/nfs4idmap.c | 4 ++-- include/linux/sunrpc/cache.h | 3 ++- net/sunrpc/cache.c | 2 +- 3 files changed, 5 insertions(+), 4 deletions(-) diff --git a/fs/nfsd/nfs4idmap.c b/fs/nfsd/nfs4idmap.c index 5b398421b05..e9012ad36ac 100644 --- a/fs/nfsd/nfs4idmap.c +++ b/fs/nfsd/nfs4idmap.c @@ -175,10 +175,10 @@ idtoname_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h) } static void -warn_no_idmapd(struct cache_detail *detail) +warn_no_idmapd(struct cache_detail *detail, int has_died) { printk("nfsd: nfsv4 idmapping failing: has idmapd %s?\n", - detail->last_close? "died" : "not been started"); + has_died ? "died" : "not been started"); } diff --git a/include/linux/sunrpc/cache.h b/include/linux/sunrpc/cache.h index 2d8b211b932..3d1fad22185 100644 --- a/include/linux/sunrpc/cache.h +++ b/include/linux/sunrpc/cache.h @@ -79,6 +79,8 @@ struct cache_detail { int (*cache_show)(struct seq_file *m, struct cache_detail *cd, struct cache_head *h); + void (*warn_no_listener)(struct cache_detail *cd, + int has_died); struct cache_head * (*alloc)(void); int (*match)(struct cache_head *orig, struct cache_head *new); @@ -102,7 +104,6 @@ struct cache_detail { atomic_t readers; /* how many time is /chennel open */ time_t last_close; /* if no readers, when did last close */ time_t last_warn; /* when we last warned about no readers */ - void (*warn_no_listener)(struct cache_detail *cd); }; diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c index ff0c23053d2..8ede4a6f384 100644 --- a/net/sunrpc/cache.c +++ b/net/sunrpc/cache.c @@ -1020,7 +1020,7 @@ static void warn_no_listener(struct cache_detail *detail) if (detail->last_warn != detail->last_close) { detail->last_warn = detail->last_close; if (detail->warn_no_listener) - detail->warn_no_listener(detail); + detail->warn_no_listener(detail, detail->last_close != 0); } } -- cgit v1.2.3-18-g5258 From 5b7a1b9f9214cb89dd164b43ca3fab7af4058e06 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Sun, 9 Aug 2009 15:14:27 -0400 Subject: SUNRPC: Ensure we initialise the cache_detail before creating procfs files Also ensure that we destroy those files before we destroy the cache_detail. Otherwise, user processes might attempt to write into uninitialised caches. Signed-off-by: Trond Myklebust --- net/sunrpc/cache.c | 30 ++++++++++++++++++++---------- 1 file changed, 20 insertions(+), 10 deletions(-) diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c index 8ede4a6f384..062d4f4307e 100644 --- a/net/sunrpc/cache.c +++ b/net/sunrpc/cache.c @@ -347,13 +347,8 @@ static int create_cache_proc_entries(struct cache_detail *cd) } #endif -int cache_register(struct cache_detail *cd) +static void sunrpc_init_cache_detail(struct cache_detail *cd) { - int ret; - - ret = create_cache_proc_entries(cd); - if (ret) - return ret; rwlock_init(&cd->hash_lock); INIT_LIST_HEAD(&cd->queue); spin_lock(&cache_list_lock); @@ -367,11 +362,9 @@ int cache_register(struct cache_detail *cd) /* start the cleaning process */ schedule_delayed_work(&cache_cleaner, 0); - return 0; } -EXPORT_SYMBOL_GPL(cache_register); -void cache_unregister(struct cache_detail *cd) +static void sunrpc_destroy_cache_detail(struct cache_detail *cd) { cache_purge(cd); spin_lock(&cache_list_lock); @@ -386,7 +379,6 @@ void cache_unregister(struct cache_detail *cd) list_del_init(&cd->others); write_unlock(&cd->hash_lock); spin_unlock(&cache_list_lock); - remove_cache_proc_entries(cd); if (list_empty(&cache_list)) { /* module must be being unloaded so its safe to kill the worker */ cancel_delayed_work_sync(&cache_cleaner); @@ -395,6 +387,24 @@ void cache_unregister(struct cache_detail *cd) out: printk(KERN_ERR "nfsd: failed to unregister %s cache\n", cd->name); } + +int cache_register(struct cache_detail *cd) +{ + int ret; + + sunrpc_init_cache_detail(cd); + ret = create_cache_proc_entries(cd); + if (ret) + sunrpc_destroy_cache_detail(cd); + return ret; +} +EXPORT_SYMBOL_GPL(cache_register); + +void cache_unregister(struct cache_detail *cd) +{ + remove_cache_proc_entries(cd); + sunrpc_destroy_cache_detail(cd); +} EXPORT_SYMBOL_GPL(cache_unregister); /* clean cache tries to find something to clean -- cgit v1.2.3-18-g5258 From da77005f0d64486cd760f43d9b7cc2379262a363 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Sun, 9 Aug 2009 15:14:28 -0400 Subject: SUNRPC: Remove the global temporary write buffer in net/sunrpc/cache.c While we do want to protect against multiple concurrent readers and writers on each upcall/downcall pipe, we don't want to limit concurrent reading and writing to separate caches. This patch therefore replaces the static buffer 'write_buf', which can only be used by one writer at a time, with use of the page cache as the temporary buffer for downcalls. We still fall back to using the the old global buffer if the downcall is larger than PAGE_CACHE_SIZE, since this is apparently needed by the SPKM security context initialisation. It then replaces the use of the global 'queue_io_mutex' with the inode->i_mutex in cache_read() and cache_write(). Signed-off-by: Trond Myklebust --- net/sunrpc/cache.c | 95 ++++++++++++++++++++++++++++++++++++++++-------------- 1 file changed, 70 insertions(+), 25 deletions(-) diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c index 062d4f4307e..c8e7d2d0726 100644 --- a/net/sunrpc/cache.c +++ b/net/sunrpc/cache.c @@ -27,6 +27,7 @@ #include #include #include +#include #include #include #include @@ -702,13 +703,14 @@ cache_read(struct file *filp, char __user *buf, size_t count, loff_t *ppos) { struct cache_reader *rp = filp->private_data; struct cache_request *rq; - struct cache_detail *cd = PDE(filp->f_path.dentry->d_inode)->data; + struct inode *inode = filp->f_path.dentry->d_inode; + struct cache_detail *cd = PDE(inode)->data; int err; if (count == 0) return 0; - mutex_lock(&queue_io_mutex); /* protect against multiple concurrent + mutex_lock(&inode->i_mutex); /* protect against multiple concurrent * readers on this file */ again: spin_lock(&queue_lock); @@ -721,7 +723,7 @@ cache_read(struct file *filp, char __user *buf, size_t count, loff_t *ppos) } if (rp->q.list.next == &cd->queue) { spin_unlock(&queue_lock); - mutex_unlock(&queue_io_mutex); + mutex_unlock(&inode->i_mutex); BUG_ON(rp->offset); return 0; } @@ -768,38 +770,81 @@ cache_read(struct file *filp, char __user *buf, size_t count, loff_t *ppos) } if (err == -EAGAIN) goto again; - mutex_unlock(&queue_io_mutex); + mutex_unlock(&inode->i_mutex); return err ? err : count; } -static char write_buf[8192]; /* protected by queue_io_mutex */ +static ssize_t cache_do_downcall(char *kaddr, const char __user *buf, + size_t count, struct cache_detail *cd) +{ + ssize_t ret; -static ssize_t -cache_write(struct file *filp, const char __user *buf, size_t count, - loff_t *ppos) + if (copy_from_user(kaddr, buf, count)) + return -EFAULT; + kaddr[count] = '\0'; + ret = cd->cache_parse(cd, kaddr, count); + if (!ret) + ret = count; + return ret; +} + +static ssize_t cache_slow_downcall(const char __user *buf, + size_t count, struct cache_detail *cd) { - int err; - struct cache_detail *cd = PDE(filp->f_path.dentry->d_inode)->data; + static char write_buf[8192]; /* protected by queue_io_mutex */ + ssize_t ret = -EINVAL; - if (count == 0) - return 0; if (count >= sizeof(write_buf)) - return -EINVAL; - + goto out; mutex_lock(&queue_io_mutex); + ret = cache_do_downcall(write_buf, buf, count, cd); + mutex_unlock(&queue_io_mutex); +out: + return ret; +} - if (copy_from_user(write_buf, buf, count)) { - mutex_unlock(&queue_io_mutex); - return -EFAULT; - } - write_buf[count] = '\0'; - if (cd->cache_parse) - err = cd->cache_parse(cd, write_buf, count); - else - err = -EINVAL; +static ssize_t cache_downcall(struct address_space *mapping, + const char __user *buf, + size_t count, struct cache_detail *cd) +{ + struct page *page; + char *kaddr; + ssize_t ret = -ENOMEM; + + if (count >= PAGE_CACHE_SIZE) + goto out_slow; + + page = find_or_create_page(mapping, 0, GFP_KERNEL); + if (!page) + goto out_slow; + + kaddr = kmap(page); + ret = cache_do_downcall(kaddr, buf, count, cd); + kunmap(page); + unlock_page(page); + page_cache_release(page); + return ret; +out_slow: + return cache_slow_downcall(buf, count, cd); +} - mutex_unlock(&queue_io_mutex); - return err ? err : count; +static ssize_t +cache_write(struct file *filp, const char __user *buf, size_t count, + loff_t *ppos) +{ + struct address_space *mapping = filp->f_mapping; + struct inode *inode = filp->f_path.dentry->d_inode; + struct cache_detail *cd = PDE(inode)->data; + ssize_t ret = -EINVAL; + + if (!cd->cache_parse) + goto out; + + mutex_lock(&inode->i_mutex); + ret = cache_downcall(mapping, buf, count, cd); + mutex_unlock(&inode->i_mutex); +out: + return ret; } static DECLARE_WAIT_QUEUE_HEAD(queue_wait); -- cgit v1.2.3-18-g5258 From bc74b4f5e63a09fb78e245794a0de1e5a2716bbe Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Sun, 9 Aug 2009 15:14:29 -0400 Subject: SUNRPC: Allow the cache_detail to specify alternative upcall mechanisms For events that are rare, such as referral DNS lookups, it makes limited sense to have a daemon constantly listening for upcalls on a channel. An alternative in those cases might simply be to run the app that fills the cache using call_usermodehelper_exec() and friends. The following patch allows the cache_detail to specify alternative upcall mechanisms for these particular cases. Signed-off-by: Trond Myklebust --- fs/nfsd/export.c | 14 ++++++++++++-- fs/nfsd/nfs4idmap.c | 16 ++++++++++++++-- include/linux/sunrpc/cache.h | 13 ++++++++++--- net/sunrpc/auth_gss/svcauth_gss.c | 7 ++++++- net/sunrpc/cache.c | 26 ++++++++++++++++++-------- net/sunrpc/svcauth_unix.c | 14 ++++++++++++-- 6 files changed, 72 insertions(+), 18 deletions(-) diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c index b92a27629fb..d9462643155 100644 --- a/fs/nfsd/export.c +++ b/fs/nfsd/export.c @@ -85,6 +85,11 @@ static void expkey_request(struct cache_detail *cd, (*bpp)[-1] = '\n'; } +static int expkey_upcall(struct cache_detail *cd, struct cache_head *h) +{ + return sunrpc_cache_pipe_upcall(cd, h, expkey_request); +} + static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old); static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *); static struct cache_detail svc_expkey_cache; @@ -259,7 +264,7 @@ static struct cache_detail svc_expkey_cache = { .hash_table = expkey_table, .name = "nfsd.fh", .cache_put = expkey_put, - .cache_request = expkey_request, + .cache_upcall = expkey_upcall, .cache_parse = expkey_parse, .cache_show = expkey_show, .match = expkey_match, @@ -355,6 +360,11 @@ static void svc_export_request(struct cache_detail *cd, (*bpp)[-1] = '\n'; } +static int svc_export_upcall(struct cache_detail *cd, struct cache_head *h) +{ + return sunrpc_cache_pipe_upcall(cd, h, svc_export_request); +} + static struct svc_export *svc_export_update(struct svc_export *new, struct svc_export *old); static struct svc_export *svc_export_lookup(struct svc_export *); @@ -724,7 +734,7 @@ struct cache_detail svc_export_cache = { .hash_table = export_table, .name = "nfsd.export", .cache_put = svc_export_put, - .cache_request = svc_export_request, + .cache_upcall = svc_export_upcall, .cache_parse = svc_export_parse, .cache_show = svc_export_show, .match = svc_export_match, diff --git a/fs/nfsd/nfs4idmap.c b/fs/nfsd/nfs4idmap.c index e9012ad36ac..cdfa86fa147 100644 --- a/fs/nfsd/nfs4idmap.c +++ b/fs/nfsd/nfs4idmap.c @@ -145,6 +145,12 @@ idtoname_request(struct cache_detail *cd, struct cache_head *ch, char **bpp, (*bpp)[-1] = '\n'; } +static int +idtoname_upcall(struct cache_detail *cd, struct cache_head *ch) +{ + return sunrpc_cache_pipe_upcall(cd, ch, idtoname_request); +} + static int idtoname_match(struct cache_head *ca, struct cache_head *cb) { @@ -192,7 +198,7 @@ static struct cache_detail idtoname_cache = { .hash_table = idtoname_table, .name = "nfs4.idtoname", .cache_put = ent_put, - .cache_request = idtoname_request, + .cache_upcall = idtoname_upcall, .cache_parse = idtoname_parse, .cache_show = idtoname_show, .warn_no_listener = warn_no_idmapd, @@ -324,6 +330,12 @@ nametoid_request(struct cache_detail *cd, struct cache_head *ch, char **bpp, (*bpp)[-1] = '\n'; } +static int +nametoid_upcall(struct cache_detail *cd, struct cache_head *ch) +{ + return sunrpc_cache_pipe_upcall(cd, ch, nametoid_request); +} + static int nametoid_match(struct cache_head *ca, struct cache_head *cb) { @@ -363,7 +375,7 @@ static struct cache_detail nametoid_cache = { .hash_table = nametoid_table, .name = "nfs4.nametoid", .cache_put = ent_put, - .cache_request = nametoid_request, + .cache_upcall = nametoid_upcall, .cache_parse = nametoid_parse, .cache_show = nametoid_show, .warn_no_listener = warn_no_idmapd, diff --git a/include/linux/sunrpc/cache.h b/include/linux/sunrpc/cache.h index 3d1fad22185..23ee25981a0 100644 --- a/include/linux/sunrpc/cache.h +++ b/include/linux/sunrpc/cache.h @@ -70,9 +70,9 @@ struct cache_detail { char *name; void (*cache_put)(struct kref *); - void (*cache_request)(struct cache_detail *cd, - struct cache_head *h, - char **bpp, int *blen); + int (*cache_upcall)(struct cache_detail *, + struct cache_head *); + int (*cache_parse)(struct cache_detail *, char *buf, int len); @@ -135,6 +135,13 @@ extern struct cache_head * sunrpc_cache_update(struct cache_detail *detail, struct cache_head *new, struct cache_head *old, int hash); +extern int +sunrpc_cache_pipe_upcall(struct cache_detail *detail, struct cache_head *h, + void (*cache_request)(struct cache_detail *, + struct cache_head *, + char **, + int *)); + extern void cache_clean_deferred(void *owner); diff --git a/net/sunrpc/auth_gss/svcauth_gss.c b/net/sunrpc/auth_gss/svcauth_gss.c index 2278a50c644..2e6a148d277 100644 --- a/net/sunrpc/auth_gss/svcauth_gss.c +++ b/net/sunrpc/auth_gss/svcauth_gss.c @@ -181,6 +181,11 @@ static void rsi_request(struct cache_detail *cd, (*bpp)[-1] = '\n'; } +static int rsi_upcall(struct cache_detail *cd, struct cache_head *h) +{ + return sunrpc_cache_pipe_upcall(cd, h, rsi_request); +} + static int rsi_parse(struct cache_detail *cd, char *mesg, int mlen) @@ -270,7 +275,7 @@ static struct cache_detail rsi_cache = { .hash_table = rsi_table, .name = "auth.rpcsec.init", .cache_put = rsi_put, - .cache_request = rsi_request, + .cache_upcall = rsi_upcall, .cache_parse = rsi_parse, .match = rsi_match, .init = rsi_init, diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c index c8e7d2d0726..e438352bed7 100644 --- a/net/sunrpc/cache.c +++ b/net/sunrpc/cache.c @@ -176,7 +176,13 @@ struct cache_head *sunrpc_cache_update(struct cache_detail *detail, } EXPORT_SYMBOL_GPL(sunrpc_cache_update); -static int cache_make_upcall(struct cache_detail *detail, struct cache_head *h); +static int cache_make_upcall(struct cache_detail *cd, struct cache_head *h) +{ + if (!cd->cache_upcall) + return -EINVAL; + return cd->cache_upcall(cd, h); +} + /* * This is the generic cache management routine for all * the authentication caches. @@ -322,7 +328,7 @@ static int create_cache_proc_entries(struct cache_detail *cd) if (p == NULL) goto out_nomem; - if (cd->cache_request || cd->cache_parse) { + if (cd->cache_upcall || cd->cache_parse) { p = proc_create_data("channel", S_IFREG|S_IRUSR|S_IWUSR, cd->proc_ent, &cache_file_operations, cd); cd->channel_ent = p; @@ -1080,10 +1086,16 @@ static void warn_no_listener(struct cache_detail *detail) } /* - * register an upcall request to user-space. + * register an upcall request to user-space and queue it up for read() by the + * upcall daemon. + * * Each request is at most one page long. */ -static int cache_make_upcall(struct cache_detail *detail, struct cache_head *h) +int sunrpc_cache_pipe_upcall(struct cache_detail *detail, struct cache_head *h, + void (*cache_request)(struct cache_detail *, + struct cache_head *, + char **, + int *)) { char *buf; @@ -1091,9 +1103,6 @@ static int cache_make_upcall(struct cache_detail *detail, struct cache_head *h) char *bp; int len; - if (detail->cache_request == NULL) - return -EINVAL; - if (atomic_read(&detail->readers) == 0 && detail->last_close < get_seconds() - 30) { warn_no_listener(detail); @@ -1112,7 +1121,7 @@ static int cache_make_upcall(struct cache_detail *detail, struct cache_head *h) bp = buf; len = PAGE_SIZE; - detail->cache_request(detail, h, &bp, &len); + cache_request(detail, h, &bp, &len); if (len < 0) { kfree(buf); @@ -1130,6 +1139,7 @@ static int cache_make_upcall(struct cache_detail *detail, struct cache_head *h) wake_up(&queue_wait); return 0; } +EXPORT_SYMBOL_GPL(sunrpc_cache_pipe_upcall); /* * parse a message from user-space and pass it diff --git a/net/sunrpc/svcauth_unix.c b/net/sunrpc/svcauth_unix.c index 5c865e2d299..6caffa34ac0 100644 --- a/net/sunrpc/svcauth_unix.c +++ b/net/sunrpc/svcauth_unix.c @@ -171,6 +171,11 @@ static void ip_map_request(struct cache_detail *cd, (*bpp)[-1] = '\n'; } +static int ip_map_upcall(struct cache_detail *cd, struct cache_head *h) +{ + return sunrpc_cache_pipe_upcall(cd, h, ip_map_request); +} + static struct ip_map *ip_map_lookup(char *class, struct in6_addr *addr); static int ip_map_update(struct ip_map *ipm, struct unix_domain *udom, time_t expiry); @@ -289,7 +294,7 @@ struct cache_detail ip_map_cache = { .hash_table = ip_table, .name = "auth.unix.ip", .cache_put = ip_map_put, - .cache_request = ip_map_request, + .cache_upcall = ip_map_upcall, .cache_parse = ip_map_parse, .cache_show = ip_map_show, .match = ip_map_match, @@ -523,6 +528,11 @@ static void unix_gid_request(struct cache_detail *cd, (*bpp)[-1] = '\n'; } +static int unix_gid_upcall(struct cache_detail *cd, struct cache_head *h) +{ + return sunrpc_cache_pipe_upcall(cd, h, unix_gid_request); +} + static struct unix_gid *unix_gid_lookup(uid_t uid); extern struct cache_detail unix_gid_cache; @@ -622,7 +632,7 @@ struct cache_detail unix_gid_cache = { .hash_table = gid_table, .name = "auth.unix.gid", .cache_put = unix_gid_put, - .cache_request = unix_gid_request, + .cache_upcall = unix_gid_upcall, .cache_parse = unix_gid_parse, .cache_show = unix_gid_show, .match = unix_gid_match, -- cgit v1.2.3-18-g5258 From 173912a6add00f4715774dcecf9ee53274c5924c Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Sun, 9 Aug 2009 15:14:29 -0400 Subject: SUNRPC: Move procfs-specific stuff out of the generic sunrpc cache code Signed-off-by: Trond Myklebust --- include/linux/sunrpc/cache.h | 11 +- net/sunrpc/cache.c | 319 ++++++++++++++++++++++++++----------------- 2 files changed, 199 insertions(+), 131 deletions(-) diff --git a/include/linux/sunrpc/cache.h b/include/linux/sunrpc/cache.h index 23ee25981a0..8e5bf303665 100644 --- a/include/linux/sunrpc/cache.h +++ b/include/linux/sunrpc/cache.h @@ -59,6 +59,11 @@ struct cache_head { #define CACHE_NEW_EXPIRY 120 /* keep new things pending confirmation for 120 seconds */ +struct cache_detail_procfs { + struct proc_dir_entry *proc_ent; + struct proc_dir_entry *flush_ent, *channel_ent, *content_ent; +}; + struct cache_detail { struct module * owner; int hash_size; @@ -98,12 +103,14 @@ struct cache_detail { /* fields for communication over channel */ struct list_head queue; - struct proc_dir_entry *proc_ent; - struct proc_dir_entry *flush_ent, *channel_ent, *content_ent; atomic_t readers; /* how many time is /chennel open */ time_t last_close; /* if no readers, when did last close */ time_t last_warn; /* when we last warned about no readers */ + + union { + struct cache_detail_procfs procfs; + } u; }; diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c index e438352bed7..1cd82eda56d 100644 --- a/net/sunrpc/cache.c +++ b/net/sunrpc/cache.c @@ -291,69 +291,9 @@ static DEFINE_SPINLOCK(cache_list_lock); static struct cache_detail *current_detail; static int current_index; -static const struct file_operations cache_file_operations; -static const struct file_operations content_file_operations; -static const struct file_operations cache_flush_operations; - static void do_cache_clean(struct work_struct *work); static DECLARE_DELAYED_WORK(cache_cleaner, do_cache_clean); -static void remove_cache_proc_entries(struct cache_detail *cd) -{ - if (cd->proc_ent == NULL) - return; - if (cd->flush_ent) - remove_proc_entry("flush", cd->proc_ent); - if (cd->channel_ent) - remove_proc_entry("channel", cd->proc_ent); - if (cd->content_ent) - remove_proc_entry("content", cd->proc_ent); - cd->proc_ent = NULL; - remove_proc_entry(cd->name, proc_net_rpc); -} - -#ifdef CONFIG_PROC_FS -static int create_cache_proc_entries(struct cache_detail *cd) -{ - struct proc_dir_entry *p; - - cd->proc_ent = proc_mkdir(cd->name, proc_net_rpc); - if (cd->proc_ent == NULL) - goto out_nomem; - cd->channel_ent = cd->content_ent = NULL; - - p = proc_create_data("flush", S_IFREG|S_IRUSR|S_IWUSR, - cd->proc_ent, &cache_flush_operations, cd); - cd->flush_ent = p; - if (p == NULL) - goto out_nomem; - - if (cd->cache_upcall || cd->cache_parse) { - p = proc_create_data("channel", S_IFREG|S_IRUSR|S_IWUSR, - cd->proc_ent, &cache_file_operations, cd); - cd->channel_ent = p; - if (p == NULL) - goto out_nomem; - } - if (cd->cache_show) { - p = proc_create_data("content", S_IFREG|S_IRUSR|S_IWUSR, - cd->proc_ent, &content_file_operations, cd); - cd->content_ent = p; - if (p == NULL) - goto out_nomem; - } - return 0; -out_nomem: - remove_cache_proc_entries(cd); - return -ENOMEM; -} -#else /* CONFIG_PROC_FS */ -static int create_cache_proc_entries(struct cache_detail *cd) -{ - return 0; -} -#endif - static void sunrpc_init_cache_detail(struct cache_detail *cd) { rwlock_init(&cd->hash_lock); @@ -395,25 +335,6 @@ out: printk(KERN_ERR "nfsd: failed to unregister %s cache\n", cd->name); } -int cache_register(struct cache_detail *cd) -{ - int ret; - - sunrpc_init_cache_detail(cd); - ret = create_cache_proc_entries(cd); - if (ret) - sunrpc_destroy_cache_detail(cd); - return ret; -} -EXPORT_SYMBOL_GPL(cache_register); - -void cache_unregister(struct cache_detail *cd) -{ - remove_cache_proc_entries(cd); - sunrpc_destroy_cache_detail(cd); -} -EXPORT_SYMBOL_GPL(cache_unregister); - /* clean cache tries to find something to clean * and cleans it. * It returns 1 if it cleaned something, @@ -704,13 +625,12 @@ struct cache_reader { int offset; /* if non-0, we have a refcnt on next request */ }; -static ssize_t -cache_read(struct file *filp, char __user *buf, size_t count, loff_t *ppos) +static ssize_t cache_read(struct file *filp, char __user *buf, size_t count, + loff_t *ppos, struct cache_detail *cd) { struct cache_reader *rp = filp->private_data; struct cache_request *rq; struct inode *inode = filp->f_path.dentry->d_inode; - struct cache_detail *cd = PDE(inode)->data; int err; if (count == 0) @@ -834,13 +754,12 @@ out_slow: return cache_slow_downcall(buf, count, cd); } -static ssize_t -cache_write(struct file *filp, const char __user *buf, size_t count, - loff_t *ppos) +static ssize_t cache_write(struct file *filp, const char __user *buf, + size_t count, loff_t *ppos, + struct cache_detail *cd) { struct address_space *mapping = filp->f_mapping; struct inode *inode = filp->f_path.dentry->d_inode; - struct cache_detail *cd = PDE(inode)->data; ssize_t ret = -EINVAL; if (!cd->cache_parse) @@ -855,13 +774,12 @@ out: static DECLARE_WAIT_QUEUE_HEAD(queue_wait); -static unsigned int -cache_poll(struct file *filp, poll_table *wait) +static unsigned int cache_poll(struct file *filp, poll_table *wait, + struct cache_detail *cd) { unsigned int mask; struct cache_reader *rp = filp->private_data; struct cache_queue *cq; - struct cache_detail *cd = PDE(filp->f_path.dentry->d_inode)->data; poll_wait(filp, &queue_wait, wait); @@ -883,14 +801,13 @@ cache_poll(struct file *filp, poll_table *wait) return mask; } -static int -cache_ioctl(struct inode *ino, struct file *filp, - unsigned int cmd, unsigned long arg) +static int cache_ioctl(struct inode *ino, struct file *filp, + unsigned int cmd, unsigned long arg, + struct cache_detail *cd) { int len = 0; struct cache_reader *rp = filp->private_data; struct cache_queue *cq; - struct cache_detail *cd = PDE(ino)->data; if (cmd != FIONREAD || !rp) return -EINVAL; @@ -913,15 +830,13 @@ cache_ioctl(struct inode *ino, struct file *filp, return put_user(len, (int __user *)arg); } -static int -cache_open(struct inode *inode, struct file *filp) +static int cache_open(struct inode *inode, struct file *filp, + struct cache_detail *cd) { struct cache_reader *rp = NULL; nonseekable_open(inode, filp); if (filp->f_mode & FMODE_READ) { - struct cache_detail *cd = PDE(inode)->data; - rp = kmalloc(sizeof(*rp), GFP_KERNEL); if (!rp) return -ENOMEM; @@ -936,11 +851,10 @@ cache_open(struct inode *inode, struct file *filp) return 0; } -static int -cache_release(struct inode *inode, struct file *filp) +static int cache_release(struct inode *inode, struct file *filp, + struct cache_detail *cd) { struct cache_reader *rp = filp->private_data; - struct cache_detail *cd = PDE(inode)->data; if (rp) { spin_lock(&queue_lock); @@ -969,18 +883,6 @@ cache_release(struct inode *inode, struct file *filp) -static const struct file_operations cache_file_operations = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .read = cache_read, - .write = cache_write, - .poll = cache_poll, - .ioctl = cache_ioctl, /* for FIONREAD */ - .open = cache_open, - .release = cache_release, -}; - - static void queue_loose(struct cache_detail *detail, struct cache_head *ch) { struct cache_queue *cq; @@ -1307,10 +1209,10 @@ static const struct seq_operations cache_content_op = { .show = c_show, }; -static int content_open(struct inode *inode, struct file *file) +static int content_open(struct inode *inode, struct file *file, + struct cache_detail *cd) { struct handle *han; - struct cache_detail *cd = PDE(inode)->data; han = __seq_open_private(file, &cache_content_op, sizeof(*han)); if (han == NULL) @@ -1320,17 +1222,10 @@ static int content_open(struct inode *inode, struct file *file) return 0; } -static const struct file_operations content_file_operations = { - .open = content_open, - .read = seq_read, - .llseek = seq_lseek, - .release = seq_release_private, -}; - static ssize_t read_flush(struct file *file, char __user *buf, - size_t count, loff_t *ppos) + size_t count, loff_t *ppos, + struct cache_detail *cd) { - struct cache_detail *cd = PDE(file->f_path.dentry->d_inode)->data; char tbuf[20]; unsigned long p = *ppos; size_t len; @@ -1348,10 +1243,10 @@ static ssize_t read_flush(struct file *file, char __user *buf, return len; } -static ssize_t write_flush(struct file * file, const char __user * buf, - size_t count, loff_t *ppos) +static ssize_t write_flush(struct file *file, const char __user *buf, + size_t count, loff_t *ppos, + struct cache_detail *cd) { - struct cache_detail *cd = PDE(file->f_path.dentry->d_inode)->data; char tbuf[20]; char *ep; long flushtime; @@ -1372,8 +1267,174 @@ static ssize_t write_flush(struct file * file, const char __user * buf, return count; } -static const struct file_operations cache_flush_operations = { +static ssize_t cache_read_procfs(struct file *filp, char __user *buf, + size_t count, loff_t *ppos) +{ + struct cache_detail *cd = PDE(filp->f_path.dentry->d_inode)->data; + + return cache_read(filp, buf, count, ppos, cd); +} + +static ssize_t cache_write_procfs(struct file *filp, const char __user *buf, + size_t count, loff_t *ppos) +{ + struct cache_detail *cd = PDE(filp->f_path.dentry->d_inode)->data; + + return cache_write(filp, buf, count, ppos, cd); +} + +static unsigned int cache_poll_procfs(struct file *filp, poll_table *wait) +{ + struct cache_detail *cd = PDE(filp->f_path.dentry->d_inode)->data; + + return cache_poll(filp, wait, cd); +} + +static int cache_ioctl_procfs(struct inode *inode, struct file *filp, + unsigned int cmd, unsigned long arg) +{ + struct cache_detail *cd = PDE(inode)->data; + + return cache_ioctl(inode, filp, cmd, arg, cd); +} + +static int cache_open_procfs(struct inode *inode, struct file *filp) +{ + struct cache_detail *cd = PDE(inode)->data; + + return cache_open(inode, filp, cd); +} + +static int cache_release_procfs(struct inode *inode, struct file *filp) +{ + struct cache_detail *cd = PDE(inode)->data; + + return cache_release(inode, filp, cd); +} + +static const struct file_operations cache_file_operations_procfs = { + .owner = THIS_MODULE, + .llseek = no_llseek, + .read = cache_read_procfs, + .write = cache_write_procfs, + .poll = cache_poll_procfs, + .ioctl = cache_ioctl_procfs, /* for FIONREAD */ + .open = cache_open_procfs, + .release = cache_release_procfs, +}; + +static int content_open_procfs(struct inode *inode, struct file *filp) +{ + struct cache_detail *cd = PDE(inode)->data; + + return content_open(inode, filp, cd); +} + +static const struct file_operations content_file_operations_procfs = { + .open = content_open_procfs, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release_private, +}; + +static ssize_t read_flush_procfs(struct file *filp, char __user *buf, + size_t count, loff_t *ppos) +{ + struct cache_detail *cd = PDE(filp->f_path.dentry->d_inode)->data; + + return read_flush(filp, buf, count, ppos, cd); +} + +static ssize_t write_flush_procfs(struct file *filp, + const char __user *buf, + size_t count, loff_t *ppos) +{ + struct cache_detail *cd = PDE(filp->f_path.dentry->d_inode)->data; + + return write_flush(filp, buf, count, ppos, cd); +} + +static const struct file_operations cache_flush_operations_procfs = { .open = nonseekable_open, - .read = read_flush, - .write = write_flush, + .read = read_flush_procfs, + .write = write_flush_procfs, }; + +static void remove_cache_proc_entries(struct cache_detail *cd) +{ + if (cd->u.procfs.proc_ent == NULL) + return; + if (cd->u.procfs.flush_ent) + remove_proc_entry("flush", cd->u.procfs.proc_ent); + if (cd->u.procfs.channel_ent) + remove_proc_entry("channel", cd->u.procfs.proc_ent); + if (cd->u.procfs.content_ent) + remove_proc_entry("content", cd->u.procfs.proc_ent); + cd->u.procfs.proc_ent = NULL; + remove_proc_entry(cd->name, proc_net_rpc); +} + +#ifdef CONFIG_PROC_FS +static int create_cache_proc_entries(struct cache_detail *cd) +{ + struct proc_dir_entry *p; + + cd->u.procfs.proc_ent = proc_mkdir(cd->name, proc_net_rpc); + if (cd->u.procfs.proc_ent == NULL) + goto out_nomem; + cd->u.procfs.channel_ent = NULL; + cd->u.procfs.content_ent = NULL; + + p = proc_create_data("flush", S_IFREG|S_IRUSR|S_IWUSR, + cd->u.procfs.proc_ent, + &cache_flush_operations_procfs, cd); + cd->u.procfs.flush_ent = p; + if (p == NULL) + goto out_nomem; + + if (cd->cache_upcall || cd->cache_parse) { + p = proc_create_data("channel", S_IFREG|S_IRUSR|S_IWUSR, + cd->u.procfs.proc_ent, + &cache_file_operations_procfs, cd); + cd->u.procfs.channel_ent = p; + if (p == NULL) + goto out_nomem; + } + if (cd->cache_show) { + p = proc_create_data("content", S_IFREG|S_IRUSR|S_IWUSR, + cd->u.procfs.proc_ent, + &content_file_operations_procfs, cd); + cd->u.procfs.content_ent = p; + if (p == NULL) + goto out_nomem; + } + return 0; +out_nomem: + remove_cache_proc_entries(cd); + return -ENOMEM; +} +#else /* CONFIG_PROC_FS */ +static int create_cache_proc_entries(struct cache_detail *cd) +{ + return 0; +} +#endif + +int cache_register(struct cache_detail *cd) +{ + int ret; + + sunrpc_init_cache_detail(cd); + ret = create_cache_proc_entries(cd); + if (ret) + sunrpc_destroy_cache_detail(cd); + return ret; +} +EXPORT_SYMBOL_GPL(cache_register); + +void cache_unregister(struct cache_detail *cd) +{ + remove_cache_proc_entries(cd); + sunrpc_destroy_cache_detail(cd); +} +EXPORT_SYMBOL_GPL(cache_unregister); -- cgit v1.2.3-18-g5258 From 8854e82d9accc80f43c0bc3ff06b5979ac858185 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Sun, 9 Aug 2009 15:14:30 -0400 Subject: SUNRPC: Add an rpc_pipefs front end for the sunrpc cache code Signed-off-by: Trond Myklebust --- include/linux/sunrpc/cache.h | 13 ++++ include/linux/sunrpc/rpc_pipe_fs.h | 8 +++ net/sunrpc/cache.c | 126 +++++++++++++++++++++++++++++++++++++ net/sunrpc/rpc_pipe.c | 43 +++++++++++++ 4 files changed, 190 insertions(+) diff --git a/include/linux/sunrpc/cache.h b/include/linux/sunrpc/cache.h index 8e5bf303665..6f52b4d7c44 100644 --- a/include/linux/sunrpc/cache.h +++ b/include/linux/sunrpc/cache.h @@ -64,6 +64,10 @@ struct cache_detail_procfs { struct proc_dir_entry *flush_ent, *channel_ent, *content_ent; }; +struct cache_detail_pipefs { + struct dentry *dir; +}; + struct cache_detail { struct module * owner; int hash_size; @@ -110,6 +114,7 @@ struct cache_detail { union { struct cache_detail_procfs procfs; + struct cache_detail_pipefs pipefs; } u; }; @@ -135,6 +140,10 @@ struct cache_deferred_req { }; +extern const struct file_operations cache_file_operations_pipefs; +extern const struct file_operations content_file_operations_pipefs; +extern const struct file_operations cache_flush_operations_pipefs; + extern struct cache_head * sunrpc_cache_lookup(struct cache_detail *detail, struct cache_head *key, int hash); @@ -186,6 +195,10 @@ extern void cache_purge(struct cache_detail *detail); extern int cache_register(struct cache_detail *cd); extern void cache_unregister(struct cache_detail *cd); +extern int sunrpc_cache_register_pipefs(struct dentry *parent, const char *, + mode_t, struct cache_detail *); +extern void sunrpc_cache_unregister_pipefs(struct cache_detail *); + extern void qword_add(char **bpp, int *lp, char *str); extern void qword_addhex(char **bpp, int *lp, char *buf, int blen); extern int qword_get(char **bpp, char *dest, int bufsize); diff --git a/include/linux/sunrpc/rpc_pipe_fs.h b/include/linux/sunrpc/rpc_pipe_fs.h index 88332ef1e95..a92571a3455 100644 --- a/include/linux/sunrpc/rpc_pipe_fs.h +++ b/include/linux/sunrpc/rpc_pipe_fs.h @@ -47,6 +47,14 @@ extern int rpc_queue_upcall(struct inode *, struct rpc_pipe_msg *); struct rpc_clnt; extern struct dentry *rpc_create_client_dir(struct dentry *, struct qstr *, struct rpc_clnt *); extern int rpc_remove_client_dir(struct dentry *); + +struct cache_detail; +extern struct dentry *rpc_create_cache_dir(struct dentry *, + struct qstr *, + mode_t umode, + struct cache_detail *); +extern void rpc_remove_cache_dir(struct dentry *); + extern struct dentry *rpc_mkpipe(struct dentry *, const char *, void *, const struct rpc_pipe_ops *, int flags); extern int rpc_unlink(struct dentry *); diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c index 1cd82eda56d..db7720e453c 100644 --- a/net/sunrpc/cache.c +++ b/net/sunrpc/cache.c @@ -32,6 +32,7 @@ #include #include #include +#include #define RPCDBG_FACILITY RPCDBG_CACHE @@ -1438,3 +1439,128 @@ void cache_unregister(struct cache_detail *cd) sunrpc_destroy_cache_detail(cd); } EXPORT_SYMBOL_GPL(cache_unregister); + +static ssize_t cache_read_pipefs(struct file *filp, char __user *buf, + size_t count, loff_t *ppos) +{ + struct cache_detail *cd = RPC_I(filp->f_path.dentry->d_inode)->private; + + return cache_read(filp, buf, count, ppos, cd); +} + +static ssize_t cache_write_pipefs(struct file *filp, const char __user *buf, + size_t count, loff_t *ppos) +{ + struct cache_detail *cd = RPC_I(filp->f_path.dentry->d_inode)->private; + + return cache_write(filp, buf, count, ppos, cd); +} + +static unsigned int cache_poll_pipefs(struct file *filp, poll_table *wait) +{ + struct cache_detail *cd = RPC_I(filp->f_path.dentry->d_inode)->private; + + return cache_poll(filp, wait, cd); +} + +static int cache_ioctl_pipefs(struct inode *inode, struct file *filp, + unsigned int cmd, unsigned long arg) +{ + struct cache_detail *cd = RPC_I(inode)->private; + + return cache_ioctl(inode, filp, cmd, arg, cd); +} + +static int cache_open_pipefs(struct inode *inode, struct file *filp) +{ + struct cache_detail *cd = RPC_I(inode)->private; + + return cache_open(inode, filp, cd); +} + +static int cache_release_pipefs(struct inode *inode, struct file *filp) +{ + struct cache_detail *cd = RPC_I(inode)->private; + + return cache_release(inode, filp, cd); +} + +const struct file_operations cache_file_operations_pipefs = { + .owner = THIS_MODULE, + .llseek = no_llseek, + .read = cache_read_pipefs, + .write = cache_write_pipefs, + .poll = cache_poll_pipefs, + .ioctl = cache_ioctl_pipefs, /* for FIONREAD */ + .open = cache_open_pipefs, + .release = cache_release_pipefs, +}; + +static int content_open_pipefs(struct inode *inode, struct file *filp) +{ + struct cache_detail *cd = RPC_I(inode)->private; + + return content_open(inode, filp, cd); +} + +const struct file_operations content_file_operations_pipefs = { + .open = content_open_pipefs, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release_private, +}; + +static ssize_t read_flush_pipefs(struct file *filp, char __user *buf, + size_t count, loff_t *ppos) +{ + struct cache_detail *cd = RPC_I(filp->f_path.dentry->d_inode)->private; + + return read_flush(filp, buf, count, ppos, cd); +} + +static ssize_t write_flush_pipefs(struct file *filp, + const char __user *buf, + size_t count, loff_t *ppos) +{ + struct cache_detail *cd = RPC_I(filp->f_path.dentry->d_inode)->private; + + return write_flush(filp, buf, count, ppos, cd); +} + +const struct file_operations cache_flush_operations_pipefs = { + .open = nonseekable_open, + .read = read_flush_pipefs, + .write = write_flush_pipefs, +}; + +int sunrpc_cache_register_pipefs(struct dentry *parent, + const char *name, mode_t umode, + struct cache_detail *cd) +{ + struct qstr q; + struct dentry *dir; + int ret = 0; + + sunrpc_init_cache_detail(cd); + q.name = name; + q.len = strlen(name); + q.hash = full_name_hash(q.name, q.len); + dir = rpc_create_cache_dir(parent, &q, umode, cd); + if (!IS_ERR(dir)) + cd->u.pipefs.dir = dir; + else { + sunrpc_destroy_cache_detail(cd); + ret = PTR_ERR(dir); + } + return ret; +} +EXPORT_SYMBOL_GPL(sunrpc_cache_register_pipefs); + +void sunrpc_cache_unregister_pipefs(struct cache_detail *cd) +{ + rpc_remove_cache_dir(cd->u.pipefs.dir); + cd->u.pipefs.dir = NULL; + sunrpc_destroy_cache_detail(cd); +} +EXPORT_SYMBOL_GPL(sunrpc_cache_unregister_pipefs); + diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c index 57e9cd3c49b..8dd81535e08 100644 --- a/net/sunrpc/rpc_pipe.c +++ b/net/sunrpc/rpc_pipe.c @@ -26,6 +26,7 @@ #include #include #include +#include static struct vfsmount *rpc_mount __read_mostly; static int rpc_mount_count; @@ -882,6 +883,48 @@ int rpc_remove_client_dir(struct dentry *dentry) return rpc_rmdir_depopulate(dentry, rpc_clntdir_depopulate); } +static const struct rpc_filelist cache_pipefs_files[3] = { + [0] = { + .name = "channel", + .i_fop = &cache_file_operations_pipefs, + .mode = S_IFIFO|S_IRUSR|S_IWUSR, + }, + [1] = { + .name = "content", + .i_fop = &content_file_operations_pipefs, + .mode = S_IFREG|S_IRUSR, + }, + [2] = { + .name = "flush", + .i_fop = &cache_flush_operations_pipefs, + .mode = S_IFREG|S_IRUSR|S_IWUSR, + }, +}; + +static int rpc_cachedir_populate(struct dentry *dentry, void *private) +{ + return rpc_populate(dentry, + cache_pipefs_files, 0, 3, + private); +} + +static void rpc_cachedir_depopulate(struct dentry *dentry) +{ + rpc_depopulate(dentry, cache_pipefs_files, 0, 3); +} + +struct dentry *rpc_create_cache_dir(struct dentry *parent, struct qstr *name, + mode_t umode, struct cache_detail *cd) +{ + return rpc_mkdir_populate(parent, name, umode, NULL, + rpc_cachedir_populate, cd); +} + +void rpc_remove_cache_dir(struct dentry *dentry) +{ + rpc_rmdir_depopulate(dentry, rpc_cachedir_depopulate); +} + /* * populate the filesystem */ -- cgit v1.2.3-18-g5258