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authorLinus Torvalds <torvalds@linux-foundation.org>2015-07-18 10:01:04 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-07-18 10:01:04 -0700
commit3a26a5b1513cddfc018c8e264979bc6e28f8ec1f (patch)
tree56356f468ed5c3e62f30d6d5c075ddb3e627a4f9 /fs
parent8be5701342790eb42c67f4f8609e203d6a461a4a (diff)
parent5a09e6ce90e1bf26f0915e7e31329402766ffead (diff)
downloadop-kernel-dev-3a26a5b1513cddfc018c8e264979bc6e28f8ec1f.zip
op-kernel-dev-3a26a5b1513cddfc018c8e264979bc6e28f8ec1f.tar.gz
Merge branch 'akpm' (patches from Andrew)
Merge fixes from Andrew Morton: "25 fixes" * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (25 commits) lib/decompress: set the compressor name to NULL on error mm/cma_debug: correct size input to bitmap function mm/cma_debug: fix debugging alloc/free interface mm/page_owner: set correct gfp_mask on page_owner mm/page_owner: fix possible access violation fsnotify: fix oops in fsnotify_clear_marks_by_group_flags() /proc/$PID/cmdline: fixup empty ARGV case dma-debug: skip debug_dma_assert_idle() when disabled hexdump: fix for non-aligned buffers checkpatch: fix long line messages about patch context mm: clean up per architecture MM hook header files MAINTAINERS: uclinux-h8-devel is moderated for non-subscribers mailmap: update Sudeep Holla's email id Update Viresh Kumar's email address mm, meminit: suppress unused memory variable warning configfs: fix kernel infoleak through user-controlled format string include, lib: add __printf attributes to several function prototypes s390/hugetlb: add hugepages_supported define mm: hugetlb: allow hugepages_supported to be architecture specific revert "s390/mm: make hugepages_supported a boot time decision" ...
Diffstat (limited to 'fs')
-rw-r--r--fs/configfs/item.c4
-rw-r--r--fs/notify/mark.c34
-rw-r--r--fs/proc/Kconfig6
-rw-r--r--fs/proc/base.c5
4 files changed, 27 insertions, 22 deletions
diff --git a/fs/configfs/item.c b/fs/configfs/item.c
index 4d6a30e..b863a09 100644
--- a/fs/configfs/item.c
+++ b/fs/configfs/item.c
@@ -115,7 +115,7 @@ void config_item_init_type_name(struct config_item *item,
const char *name,
struct config_item_type *type)
{
- config_item_set_name(item, name);
+ config_item_set_name(item, "%s", name);
item->ci_type = type;
config_item_init(item);
}
@@ -124,7 +124,7 @@ EXPORT_SYMBOL(config_item_init_type_name);
void config_group_init_type_name(struct config_group *group, const char *name,
struct config_item_type *type)
{
- config_item_set_name(&group->cg_item, name);
+ config_item_set_name(&group->cg_item, "%s", name);
group->cg_item.ci_type = type;
config_group_init(group);
}
diff --git a/fs/notify/mark.c b/fs/notify/mark.c
index 92e48c7..3e594ce4 100644
--- a/fs/notify/mark.c
+++ b/fs/notify/mark.c
@@ -152,31 +152,15 @@ void fsnotify_destroy_mark_locked(struct fsnotify_mark *mark,
BUG();
list_del_init(&mark->g_list);
-
spin_unlock(&mark->lock);
if (inode && (mark->flags & FSNOTIFY_MARK_FLAG_OBJECT_PINNED))
iput(inode);
- /* release lock temporarily */
- mutex_unlock(&group->mark_mutex);
spin_lock(&destroy_lock);
list_add(&mark->g_list, &destroy_list);
spin_unlock(&destroy_lock);
wake_up(&destroy_waitq);
- /*
- * We don't necessarily have a ref on mark from caller so the above destroy
- * may have actually freed it, unless this group provides a 'freeing_mark'
- * function which must be holding a reference.
- */
-
- /*
- * Some groups like to know that marks are being freed. This is a
- * callback to the group function to let it know that this mark
- * is being freed.
- */
- if (group->ops->freeing_mark)
- group->ops->freeing_mark(mark, group);
/*
* __fsnotify_update_child_dentry_flags(inode);
@@ -191,8 +175,6 @@ void fsnotify_destroy_mark_locked(struct fsnotify_mark *mark,
*/
atomic_dec(&group->num_marks);
-
- mutex_lock_nested(&group->mark_mutex, SINGLE_DEPTH_NESTING);
}
void fsnotify_destroy_mark(struct fsnotify_mark *mark,
@@ -205,7 +187,10 @@ void fsnotify_destroy_mark(struct fsnotify_mark *mark,
/*
* Destroy all marks in the given list. The marks must be already detached from
- * the original inode / vfsmount.
+ * the original inode / vfsmount. Note that we can race with
+ * fsnotify_clear_marks_by_group_flags(). However we hold a reference to each
+ * mark so they won't get freed from under us and nobody else touches our
+ * free_list list_head.
*/
void fsnotify_destroy_marks(struct list_head *to_free)
{
@@ -406,7 +391,7 @@ struct fsnotify_mark *fsnotify_find_mark(struct hlist_head *head,
}
/*
- * clear any marks in a group in which mark->flags & flags is true
+ * Clear any marks in a group in which mark->flags & flags is true.
*/
void fsnotify_clear_marks_by_group_flags(struct fsnotify_group *group,
unsigned int flags)
@@ -460,6 +445,7 @@ static int fsnotify_mark_destroy(void *ignored)
{
struct fsnotify_mark *mark, *next;
struct list_head private_destroy_list;
+ struct fsnotify_group *group;
for (;;) {
spin_lock(&destroy_lock);
@@ -471,6 +457,14 @@ static int fsnotify_mark_destroy(void *ignored)
list_for_each_entry_safe(mark, next, &private_destroy_list, g_list) {
list_del_init(&mark->g_list);
+ group = mark->group;
+ /*
+ * Some groups like to know that marks are being freed.
+ * This is a callback to the group function to let it
+ * know that this mark is being freed.
+ */
+ if (group && group->ops->freeing_mark)
+ group->ops->freeing_mark(mark, group);
fsnotify_put_mark(mark);
}
diff --git a/fs/proc/Kconfig b/fs/proc/Kconfig
index d751fcb..1ade120 100644
--- a/fs/proc/Kconfig
+++ b/fs/proc/Kconfig
@@ -75,3 +75,9 @@ config PROC_PAGE_MONITOR
config PROC_CHILDREN
bool "Include /proc/<pid>/task/<tid>/children file"
default n
+ help
+ Provides a fast way to retrieve first level children pids of a task. See
+ <file:Documentation/filesystems/proc.txt> for more information.
+
+ Say Y if you are running any user-space software which takes benefit from
+ this interface. For example, rkt is such a piece of software.
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 87782e8..aa50d1a 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -243,6 +243,11 @@ static ssize_t proc_pid_cmdline_read(struct file *file, char __user *buf,
len1 = arg_end - arg_start;
len2 = env_end - env_start;
+ /* Empty ARGV. */
+ if (len1 == 0) {
+ rv = 0;
+ goto out_free_page;
+ }
/*
* Inherently racy -- command line shares address space
* with code and data.
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