From 0db74d9a2d2b312dd2cff066c5b97b8e626e403a Mon Sep 17 00:00:00 2001 From: Weston Andros Adamson Date: Tue, 23 Oct 2012 10:43:36 -0400 Subject: SUNRPC: remove BUG_ON calls from cache_read Replace BUG_ON() with WARN_ON_ONCE() in two parts of cache_read(). Signed-off-by: Weston Andros Adamson Signed-off-by: Trond Myklebust --- net/sunrpc/cache.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'net/sunrpc/cache.c') diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c index fc2f7aa4dca7..9afa4393c217 100644 --- a/net/sunrpc/cache.c +++ b/net/sunrpc/cache.c @@ -775,11 +775,11 @@ static ssize_t cache_read(struct file *filp, char __user *buf, size_t count, if (rp->q.list.next == &cd->queue) { spin_unlock(&queue_lock); mutex_unlock(&inode->i_mutex); - BUG_ON(rp->offset); + WARN_ON_ONCE(rp->offset); return 0; } rq = container_of(rp->q.list.next, struct cache_request, q.list); - BUG_ON(rq->q.reader); + WARN_ON_ONCE(rq->q.reader); if (rp->offset == 0) rq->readers++; spin_unlock(&queue_lock); -- cgit From ec1686761753ead775e9474a6265323a4c555bc6 Mon Sep 17 00:00:00 2001 From: Yanchuan Nian Date: Fri, 4 Jan 2013 19:45:35 +0800 Subject: nfsd: Remove write permission from file content The write function doesn't be implemented in file content, and it's meaningless to write data into this file directly. Remove write permission from it. Signed-off-by: Yanchuan Nian Signed-off-by: J. Bruce Fields --- net/sunrpc/cache.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'net/sunrpc/cache.c') diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c index 9afa4393c217..9f8470353362 100644 --- a/net/sunrpc/cache.c +++ b/net/sunrpc/cache.c @@ -1614,7 +1614,7 @@ static int create_cache_proc_entries(struct cache_detail *cd, struct net *net) goto out_nomem; } if (cd->cache_show) { - p = proc_create_data("content", S_IFREG|S_IRUSR|S_IWUSR, + p = proc_create_data("content", S_IFREG|S_IRUSR, cd->u.procfs.proc_ent, &content_file_operations_procfs, cd); cd->u.procfs.content_ent = p; -- cgit From 2d4383383b0b04ca380b67aa2d7397d0b399dcbf Mon Sep 17 00:00:00 2001 From: Stanislav Kinsbursky Date: Mon, 4 Feb 2013 14:02:50 +0300 Subject: SUNRPC: rework cache upcall logic For most of SUNRPC caches (except NFS DNS cache) cache_detail->cache_upcall is redundant since all that it's implementations are doing is calling sunrpc_cache_pipe_upcall() with proper function address argument. Cache request function address is now stored on cache_detail structure and thus all the code can be simplified. Now, for those cache details, which doesn't have cache_upcall callback (the only one, which still has is nfs_dns_resolve_template) sunrpc_cache_pipe_upcall will be called instead. Signed-off-by: Stanislav Kinsbursky Signed-off-by: J. Bruce Fields --- net/sunrpc/cache.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) (limited to 'net/sunrpc/cache.c') diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c index 9f8470353362..51853d8ed0bc 100644 --- a/net/sunrpc/cache.c +++ b/net/sunrpc/cache.c @@ -196,9 +196,9 @@ EXPORT_SYMBOL_GPL(sunrpc_cache_update); 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); + if (cd->cache_upcall) + return cd->cache_upcall(cd, h); + return sunrpc_cache_pipe_upcall(cd, h, cd->cache_request); } static inline int cache_is_valid(struct cache_detail *detail, struct cache_head *h) @@ -1152,6 +1152,9 @@ int sunrpc_cache_pipe_upcall(struct cache_detail *detail, struct cache_head *h, char *bp; int len; + if (!detail->cache_request) + return -EINVAL; + if (!cache_listeners_exist(detail)) { warn_no_listener(detail); return -EINVAL; @@ -1605,7 +1608,7 @@ static int create_cache_proc_entries(struct cache_detail *cd, struct net *net) if (p == NULL) goto out_nomem; - if (cd->cache_upcall || cd->cache_parse) { + if (cd->cache_request || cd->cache_parse) { p = proc_create_data("channel", S_IFREG|S_IRUSR|S_IWUSR, cd->u.procfs.proc_ent, &cache_file_operations_procfs, cd); -- cgit From 21cd1254d3402a72927ed744e8ac1a7cf532f1ea Mon Sep 17 00:00:00 2001 From: Stanislav Kinsbursky Date: Mon, 4 Feb 2013 14:02:55 +0300 Subject: SUNRPC: remove "cache_request" argument in sunrpc_cache_pipe_upcall() function Passing this pointer is redundant since it's stored on cache_detail structure, which is also passed to sunrpc_cache_pipe_upcall () function. Signed-off-by: Stanislav Kinsbursky Signed-off-by: J. Bruce Fields --- net/sunrpc/cache.c | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-) (limited to 'net/sunrpc/cache.c') diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c index 51853d8ed0bc..8ffec5aebeff 100644 --- a/net/sunrpc/cache.c +++ b/net/sunrpc/cache.c @@ -198,7 +198,7 @@ static int cache_make_upcall(struct cache_detail *cd, struct cache_head *h) { if (cd->cache_upcall) return cd->cache_upcall(cd, h); - return sunrpc_cache_pipe_upcall(cd, h, cd->cache_request); + return sunrpc_cache_pipe_upcall(cd, h); } static inline int cache_is_valid(struct cache_detail *detail, struct cache_head *h) @@ -1140,11 +1140,7 @@ static bool cache_listeners_exist(struct cache_detail *detail) * * Each request is at most one page long. */ -int sunrpc_cache_pipe_upcall(struct cache_detail *detail, struct cache_head *h, - void (*cache_request)(struct cache_detail *, - struct cache_head *, - char **, - int *)) +int sunrpc_cache_pipe_upcall(struct cache_detail *detail, struct cache_head *h) { char *buf; @@ -1172,7 +1168,7 @@ int sunrpc_cache_pipe_upcall(struct cache_detail *detail, struct cache_head *h, bp = buf; len = PAGE_SIZE; - cache_request(detail, h, &bp, &len); + detail->cache_request(detail, h, &bp, &len); if (len < 0) { kfree(buf); -- cgit From d94af6dea9cd680fb795dbc409a7360f1c63dc34 Mon Sep 17 00:00:00 2001 From: Stanislav Kinsbursky Date: Mon, 4 Feb 2013 14:03:03 +0300 Subject: SUNRPC: move cache_detail->cache_request callback call to cache_read() The reason to move cache_request() callback call from sunrpc_cache_pipe_upcall() to cache_read() is that this garantees, that cache access will be done userspace process context (only userspace process have proper root context). This is required for NFSd support in container: svc_export_request() (which is cache_request callback) calls d_path(), which, in turn, traverse dentry up to current->fs->root. Kernel threads always have global root, while container have be in "root jail" - i.e. have it's own nested root. Signed-off-by: Stanislav Kinsbursky Signed-off-by: J. Bruce Fields --- net/sunrpc/cache.c | 32 ++++++++++++++++++++------------ 1 file changed, 20 insertions(+), 12 deletions(-) (limited to 'net/sunrpc/cache.c') diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c index 8ffec5aebeff..55024714f001 100644 --- a/net/sunrpc/cache.c +++ b/net/sunrpc/cache.c @@ -750,6 +750,18 @@ struct cache_reader { int offset; /* if non-0, we have a refcnt on next request */ }; +static int cache_request(struct cache_detail *detail, + struct cache_request *crq) +{ + char *bp = crq->buf; + int len = PAGE_SIZE; + + detail->cache_request(detail, crq->item, &bp, &len); + if (len < 0) + return -EAGAIN; + return PAGE_SIZE - len; +} + static ssize_t cache_read(struct file *filp, char __user *buf, size_t count, loff_t *ppos, struct cache_detail *cd) { @@ -784,6 +796,13 @@ static ssize_t cache_read(struct file *filp, char __user *buf, size_t count, rq->readers++; spin_unlock(&queue_lock); + if (rq->len == 0) { + err = cache_request(cd, rq); + if (err < 0) + goto out; + rq->len = err; + } + if (rp->offset == 0 && !test_bit(CACHE_PENDING, &rq->item->flags)) { err = -EAGAIN; spin_lock(&queue_lock); @@ -1145,8 +1164,6 @@ int sunrpc_cache_pipe_upcall(struct cache_detail *detail, struct cache_head *h) char *buf; struct cache_request *crq; - char *bp; - int len; if (!detail->cache_request) return -EINVAL; @@ -1166,19 +1183,10 @@ int sunrpc_cache_pipe_upcall(struct cache_detail *detail, struct cache_head *h) return -EAGAIN; } - bp = buf; len = PAGE_SIZE; - - detail->cache_request(detail, h, &bp, &len); - - if (len < 0) { - kfree(buf); - kfree(crq); - return -EAGAIN; - } crq->q.reader = 0; crq->item = cache_get(h); crq->buf = buf; - crq->len = PAGE_SIZE - len; + crq->len = 0; crq->readers = 0; spin_lock(&queue_lock); list_add_tail(&crq->q.list, &detail->queue); -- cgit From 496ad9aa8ef448058e36ca7a787c61f2e63f0f54 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Wed, 23 Jan 2013 17:07:38 -0500 Subject: new helper: file_inode(file) Signed-off-by: Al Viro --- net/sunrpc/cache.c | 28 ++++++++++++++-------------- 1 file changed, 14 insertions(+), 14 deletions(-) (limited to 'net/sunrpc/cache.c') diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c index 9afa4393c217..f3897d10f649 100644 --- a/net/sunrpc/cache.c +++ b/net/sunrpc/cache.c @@ -755,7 +755,7 @@ static ssize_t cache_read(struct file *filp, char __user *buf, size_t count, { struct cache_reader *rp = filp->private_data; struct cache_request *rq; - struct inode *inode = filp->f_path.dentry->d_inode; + struct inode *inode = file_inode(filp); int err; if (count == 0) @@ -886,7 +886,7 @@ static ssize_t cache_write(struct file *filp, const char __user *buf, struct cache_detail *cd) { struct address_space *mapping = filp->f_mapping; - struct inode *inode = filp->f_path.dentry->d_inode; + struct inode *inode = file_inode(filp); ssize_t ret = -EINVAL; if (!cd->cache_parse) @@ -1454,7 +1454,7 @@ static ssize_t write_flush(struct file *file, const char __user *buf, 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; + struct cache_detail *cd = PDE(file_inode(filp))->data; return cache_read(filp, buf, count, ppos, cd); } @@ -1462,14 +1462,14 @@ static ssize_t cache_read_procfs(struct file *filp, char __user *buf, 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; + struct cache_detail *cd = PDE(file_inode(filp))->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; + struct cache_detail *cd = PDE(file_inode(filp))->data; return cache_poll(filp, wait, cd); } @@ -1477,7 +1477,7 @@ static unsigned int cache_poll_procfs(struct file *filp, poll_table *wait) static long cache_ioctl_procfs(struct file *filp, unsigned int cmd, unsigned long arg) { - struct inode *inode = filp->f_path.dentry->d_inode; + struct inode *inode = file_inode(filp); struct cache_detail *cd = PDE(inode)->data; return cache_ioctl(inode, filp, cmd, arg, cd); @@ -1546,7 +1546,7 @@ static int release_flush_procfs(struct inode *inode, struct file *filp) 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; + struct cache_detail *cd = PDE(file_inode(filp))->data; return read_flush(filp, buf, count, ppos, cd); } @@ -1555,7 +1555,7 @@ 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; + struct cache_detail *cd = PDE(file_inode(filp))->data; return write_flush(filp, buf, count, ppos, cd); } @@ -1686,7 +1686,7 @@ EXPORT_SYMBOL_GPL(cache_destroy_net); 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; + struct cache_detail *cd = RPC_I(file_inode(filp))->private; return cache_read(filp, buf, count, ppos, cd); } @@ -1694,14 +1694,14 @@ static ssize_t cache_read_pipefs(struct file *filp, char __user *buf, 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; + struct cache_detail *cd = RPC_I(file_inode(filp))->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; + struct cache_detail *cd = RPC_I(file_inode(filp))->private; return cache_poll(filp, wait, cd); } @@ -1709,7 +1709,7 @@ static unsigned int cache_poll_pipefs(struct file *filp, poll_table *wait) static long cache_ioctl_pipefs(struct file *filp, unsigned int cmd, unsigned long arg) { - struct inode *inode = filp->f_dentry->d_inode; + struct inode *inode = file_inode(filp); struct cache_detail *cd = RPC_I(inode)->private; return cache_ioctl(inode, filp, cmd, arg, cd); @@ -1778,7 +1778,7 @@ static int release_flush_pipefs(struct inode *inode, struct file *filp) 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; + struct cache_detail *cd = RPC_I(file_inode(filp))->private; return read_flush(filp, buf, count, ppos, cd); } @@ -1787,7 +1787,7 @@ 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; + struct cache_detail *cd = RPC_I(file_inode(filp))->private; return write_flush(filp, buf, count, ppos, cd); } -- cgit From b67bfe0d42cac56c512dd5da4b1b347a23f4b70a Mon Sep 17 00:00:00 2001 From: Sasha Levin Date: Wed, 27 Feb 2013 17:06:00 -0800 Subject: hlist: drop the node parameter from iterators I'm not sure why, but the hlist for each entry iterators were conceived list_for_each_entry(pos, head, member) The hlist ones were greedy and wanted an extra parameter: hlist_for_each_entry(tpos, pos, head, member) Why did they need an extra pos parameter? I'm not quite sure. Not only they don't really need it, it also prevents the iterator from looking exactly like the list iterator, which is unfortunate. Besides the semantic patch, there was some manual work required: - Fix up the actual hlist iterators in linux/list.h - Fix up the declaration of other iterators based on the hlist ones. - A very small amount of places were using the 'node' parameter, this was modified to use 'obj->member' instead. - Coccinelle didn't handle the hlist_for_each_entry_safe iterator properly, so those had to be fixed up manually. The semantic patch which is mostly the work of Peter Senna Tschudin is here: @@ iterator name hlist_for_each_entry, hlist_for_each_entry_continue, hlist_for_each_entry_from, hlist_for_each_entry_rcu, hlist_for_each_entry_rcu_bh, hlist_for_each_entry_continue_rcu_bh, for_each_busy_worker, ax25_uid_for_each, ax25_for_each, inet_bind_bucket_for_each, sctp_for_each_hentry, sk_for_each, sk_for_each_rcu, sk_for_each_from, sk_for_each_safe, sk_for_each_bound, hlist_for_each_entry_safe, hlist_for_each_entry_continue_rcu, nr_neigh_for_each, nr_neigh_for_each_safe, nr_node_for_each, nr_node_for_each_safe, for_each_gfn_indirect_valid_sp, for_each_gfn_sp, for_each_host; type T; expression a,c,d,e; identifier b; statement S; @@ -T b; <+... when != b ( hlist_for_each_entry(a, - b, c, d) S | hlist_for_each_entry_continue(a, - b, c) S | hlist_for_each_entry_from(a, - b, c) S | hlist_for_each_entry_rcu(a, - b, c, d) S | hlist_for_each_entry_rcu_bh(a, - b, c, d) S | hlist_for_each_entry_continue_rcu_bh(a, - b, c) S | for_each_busy_worker(a, c, - b, d) S | ax25_uid_for_each(a, - b, c) S | ax25_for_each(a, - b, c) S | inet_bind_bucket_for_each(a, - b, c) S | sctp_for_each_hentry(a, - b, c) S | sk_for_each(a, - b, c) S | sk_for_each_rcu(a, - b, c) S | sk_for_each_from -(a, b) +(a) S + sk_for_each_from(a) S | sk_for_each_safe(a, - b, c, d) S | sk_for_each_bound(a, - b, c) S | hlist_for_each_entry_safe(a, - b, c, d, e) S | hlist_for_each_entry_continue_rcu(a, - b, c) S | nr_neigh_for_each(a, - b, c) S | nr_neigh_for_each_safe(a, - b, c, d) S | nr_node_for_each(a, - b, c) S | nr_node_for_each_safe(a, - b, c, d) S | - for_each_gfn_sp(a, c, d, b) S + for_each_gfn_sp(a, c, d) S | - for_each_gfn_indirect_valid_sp(a, c, d, b) S + for_each_gfn_indirect_valid_sp(a, c, d) S | for_each_host(a, - b, c) S | for_each_host_safe(a, - b, c, d) S | for_each_mesh_entry(a, - b, c, d) S ) ...+> [akpm@linux-foundation.org: drop bogus change from net/ipv4/raw.c] [akpm@linux-foundation.org: drop bogus hunk from net/ipv6/raw.c] [akpm@linux-foundation.org: checkpatch fixes] [akpm@linux-foundation.org: fix warnings] [akpm@linux-foudnation.org: redo intrusive kvm changes] Tested-by: Peter Senna Tschudin Acked-by: Paul E. McKenney Signed-off-by: Sasha Levin Cc: Wu Fengguang Cc: Marcelo Tosatti Cc: Gleb Natapov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- net/sunrpc/cache.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'net/sunrpc/cache.c') diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c index f3897d10f649..39a4112faf54 100644 --- a/net/sunrpc/cache.c +++ b/net/sunrpc/cache.c @@ -670,13 +670,13 @@ static void cache_revisit_request(struct cache_head *item) { struct cache_deferred_req *dreq; struct list_head pending; - struct hlist_node *lp, *tmp; + struct hlist_node *tmp; int hash = DFR_HASH(item); INIT_LIST_HEAD(&pending); spin_lock(&cache_defer_lock); - hlist_for_each_entry_safe(dreq, lp, tmp, &cache_defer_hash[hash], hash) + hlist_for_each_entry_safe(dreq, tmp, &cache_defer_hash[hash], hash) if (dreq->item == item) { __unhash_deferred_req(dreq); list_add(&dreq->recent, &pending); -- cgit