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authorNeilBrown <neilb@suse.de>2006-03-20 17:53:53 +1100
committerGreg Kroah-Hartman <gregkh@suse.de>2006-04-14 11:41:24 -0700
commit4508a7a734b111b8b7e39986237d84acb1168dd0 (patch)
tree8fe535fbb97d619c9069da26367ead03d1a294aa /include/linux
parentf043ca43c1ae354346f72dc5826d820d5619f0b2 (diff)
[PATCH] sysfs: Allow sysfs attribute files to be pollable
It works like this: Open the file Read all the contents. Call poll requesting POLLERR or POLLPRI (so select/exceptfds works) When poll returns, close the file and go to top of loop. or lseek to start of file and go back to the 'read'. Events are signaled by an object manager calling sysfs_notify(kobj, dir, attr); If the dir is non-NULL, it is used to find a subdirectory which contains the attribute (presumably created by sysfs_create_group). This has a cost of one int per attribute, one wait_queuehead per kobject, one int per open file. The name "sysfs_notify" may be confused with the inotify functionality. Maybe it would be nice to support inotify for sysfs attributes as well? This patch also uses sysfs_notify to allow /sys/block/md*/md/sync_action to be pollable Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/kobject.h2
-rw-r--r--include/linux/sysfs.h6
2 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/kobject.h b/include/linux/kobject.h
index 4cb1214ec29..dcd0623be89 100644
--- a/include/linux/kobject.h
+++ b/include/linux/kobject.h
@@ -24,6 +24,7 @@
#include <linux/rwsem.h>
#include <linux/kref.h>
#include <linux/kernel.h>
+#include <linux/wait.h>
#include <asm/atomic.h>
#define KOBJ_NAME_LEN 20
@@ -56,6 +57,7 @@ struct kobject {
struct kset * kset;
struct kobj_type * ktype;
struct dentry * dentry;
+ wait_queue_head_t poll;
};
extern int kobject_set_name(struct kobject *, const char *, ...)
diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h
index 392da5a6dac..1ea5d3cda6a 100644
--- a/include/linux/sysfs.h
+++ b/include/linux/sysfs.h
@@ -74,6 +74,7 @@ struct sysfs_dirent {
umode_t s_mode;
struct dentry * s_dentry;
struct iattr * s_iattr;
+ atomic_t s_event;
};
#define SYSFS_ROOT 0x0001
@@ -117,6 +118,7 @@ int sysfs_remove_bin_file(struct kobject * kobj, struct bin_attribute * attr);
int sysfs_create_group(struct kobject *, const struct attribute_group *);
void sysfs_remove_group(struct kobject *, const struct attribute_group *);
+void sysfs_notify(struct kobject * k, char *dir, char *attr);
#else /* CONFIG_SYSFS */
@@ -185,6 +187,10 @@ static inline void sysfs_remove_group(struct kobject * k, const struct attribute
;
}
+static inline void sysfs_notify(struct kobject * k, char *dir, char *attr)
+{
+}
+
#endif /* CONFIG_SYSFS */
#endif /* _SYSFS_H_ */