From 1c205ae18db53ff72985dd79f3baaf2dbaba6db7 Mon Sep 17 00:00:00 2001 From: Andi Kleen Date: Tue, 5 Jan 2010 12:48:01 +0100 Subject: sysfs: Add sysfs_add/remove_files utility functions Adding/Removing a whole array of attributes is very common. Add a standard utility function to do this with a simple function call, instead of requiring drivers to open code this. Signed-off-by: Andi Kleen Signed-off-by: Greg Kroah-Hartman --- fs/sysfs/file.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) (limited to 'fs/sysfs/file.c') diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c index dc30d9e31683..50b725bcc3f3 100644 --- a/fs/sysfs/file.c +++ b/fs/sysfs/file.c @@ -542,6 +542,18 @@ int sysfs_create_file(struct kobject * kobj, const struct attribute * attr) } +int sysfs_create_files(struct kobject *kobj, const struct attribute **ptr) +{ + int err = 0; + int i; + + for (i = 0; ptr[i] && !err; i++) + err = sysfs_create_file(kobj, ptr[i]); + if (err) + while (--i >= 0) + sysfs_remove_file(kobj, ptr[i]); + return err; +} /** * sysfs_add_file_to_group - add an attribute file to a pre-existing group. @@ -614,6 +626,12 @@ void sysfs_remove_file(struct kobject * kobj, const struct attribute * attr) sysfs_hash_and_remove(kobj->sd, attr->name); } +void sysfs_remove_files(struct kobject * kobj, const struct attribute **ptr) +{ + int i; + for (i = 0; ptr[i]; i++) + sysfs_remove_file(kobj, ptr[i]); +} /** * sysfs_remove_file_from_group - remove an attribute file from a group. @@ -732,3 +750,5 @@ EXPORT_SYMBOL_GPL(sysfs_schedule_callback); EXPORT_SYMBOL_GPL(sysfs_create_file); EXPORT_SYMBOL_GPL(sysfs_remove_file); +EXPORT_SYMBOL_GPL(sysfs_remove_files); +EXPORT_SYMBOL_GPL(sysfs_create_files); -- cgit v1.2.3 From 52cf25d0ab7f78eeecc59ac652ed5090f69b619e Mon Sep 17 00:00:00 2001 From: Emese Revfy Date: Tue, 19 Jan 2010 02:58:23 +0100 Subject: Driver core: Constify struct sysfs_ops in struct kobj_type Constify struct sysfs_ops. This is part of the ops structure constification effort started by Arjan van de Ven et al. Benefits of this constification: * prevents modification of data that is shared (referenced) by many other structure instances at runtime * detects/prevents accidental (but not intentional) modification attempts on archs that enforce read-only kernel data at runtime * potentially better optimized code as the compiler can assume that the const data cannot be changed * the compiler/linker move const data into .rodata and therefore exclude them from false sharing Signed-off-by: Emese Revfy Acked-by: David Teigland Acked-by: Matt Domsch Acked-by: Maciej Sosnowski Acked-by: Hans J. Koch Acked-by: Pekka Enberg Acked-by: Jens Axboe Acked-by: Stephen Hemminger Signed-off-by: Greg Kroah-Hartman --- fs/sysfs/file.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'fs/sysfs/file.c') diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c index 50b725bcc3f3..ced2299f1c9a 100644 --- a/fs/sysfs/file.c +++ b/fs/sysfs/file.c @@ -53,7 +53,7 @@ struct sysfs_buffer { size_t count; loff_t pos; char * page; - struct sysfs_ops * ops; + const struct sysfs_ops * ops; struct mutex mutex; int needs_read_fill; int event; @@ -75,7 +75,7 @@ static int fill_read_buffer(struct dentry * dentry, struct sysfs_buffer * buffer { struct sysfs_dirent *attr_sd = dentry->d_fsdata; struct kobject *kobj = attr_sd->s_parent->s_dir.kobj; - struct sysfs_ops * ops = buffer->ops; + const struct sysfs_ops * ops = buffer->ops; int ret = 0; ssize_t count; @@ -199,7 +199,7 @@ flush_write_buffer(struct dentry * dentry, struct sysfs_buffer * buffer, size_t { struct sysfs_dirent *attr_sd = dentry->d_fsdata; struct kobject *kobj = attr_sd->s_parent->s_dir.kobj; - struct sysfs_ops * ops = buffer->ops; + const struct sysfs_ops * ops = buffer->ops; int rc; /* need attr_sd for attr and ops, its parent for kobj */ @@ -335,7 +335,7 @@ static int sysfs_open_file(struct inode *inode, struct file *file) struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata; struct kobject *kobj = attr_sd->s_parent->s_dir.kobj; struct sysfs_buffer *buffer; - struct sysfs_ops *ops; + const struct sysfs_ops *ops; int error = -EACCES; char *p; -- cgit v1.2.3 From e72ceb8ccac5f770b3e696e09bb673dca7024b20 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Thu, 11 Feb 2010 15:18:38 -0800 Subject: sysfs: Remove sysfs_get/put_active_two It turns out that holding an active reference on a directory is pointless. The purpose of the active references are to allows us to block when removing sysfs entries that have custom methods so we don't remove modules while running modular code and to keep those custom methods from accessing data structures after the files have been removed. Further sysfs_remove_dir remove all elements in the directory before removing the directory itself, so there is no chance we will remove a directory with active children. Signed-off-by: Eric W. Biederman Cc: Tejun Heo Signed-off-by: Greg Kroah-Hartman --- fs/sysfs/file.c | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-) (limited to 'fs/sysfs/file.c') diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c index ced2299f1c9a..40961366e929 100644 --- a/fs/sysfs/file.c +++ b/fs/sysfs/file.c @@ -85,13 +85,13 @@ static int fill_read_buffer(struct dentry * dentry, struct sysfs_buffer * buffer return -ENOMEM; /* need attr_sd for attr and ops, its parent for kobj */ - if (!sysfs_get_active_two(attr_sd)) + if (!sysfs_get_active(attr_sd)) return -ENODEV; buffer->event = atomic_read(&attr_sd->s_attr.open->event); count = ops->show(kobj, attr_sd->s_attr.attr, buffer->page); - sysfs_put_active_two(attr_sd); + sysfs_put_active(attr_sd); /* * The code works fine with PAGE_SIZE return but it's likely to @@ -203,12 +203,12 @@ flush_write_buffer(struct dentry * dentry, struct sysfs_buffer * buffer, size_t int rc; /* need attr_sd for attr and ops, its parent for kobj */ - if (!sysfs_get_active_two(attr_sd)) + if (!sysfs_get_active(attr_sd)) return -ENODEV; rc = ops->store(kobj, attr_sd->s_attr.attr, buffer->page, count); - sysfs_put_active_two(attr_sd); + sysfs_put_active(attr_sd); return rc; } @@ -344,7 +344,7 @@ static int sysfs_open_file(struct inode *inode, struct file *file) memmove(last_sysfs_file, p, strlen(p) + 1); /* need attr_sd for attr and ops, its parent for kobj */ - if (!sysfs_get_active_two(attr_sd)) + if (!sysfs_get_active(attr_sd)) return -ENODEV; /* every kobject with an attribute needs a ktype assigned */ @@ -393,13 +393,13 @@ static int sysfs_open_file(struct inode *inode, struct file *file) goto err_free; /* open succeeded, put active references */ - sysfs_put_active_two(attr_sd); + sysfs_put_active(attr_sd); return 0; err_free: kfree(buffer); err_out: - sysfs_put_active_two(attr_sd); + sysfs_put_active(attr_sd); return error; } @@ -437,12 +437,12 @@ static unsigned int sysfs_poll(struct file *filp, poll_table *wait) struct sysfs_open_dirent *od = attr_sd->s_attr.open; /* need parent for the kobj, grab both */ - if (!sysfs_get_active_two(attr_sd)) + if (!sysfs_get_active(attr_sd)) goto trigger; poll_wait(filp, &od->poll, wait); - sysfs_put_active_two(attr_sd); + sysfs_put_active(attr_sd); if (buffer->event != atomic_read(&od->event)) goto trigger; -- cgit v1.2.3 From a2db6842873c8e5a70652f278d469128cb52db70 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Thu, 11 Feb 2010 15:20:00 -0800 Subject: sysfs: Only take active references on attributes. If we exclude directories and symlinks from the set of sysfs dirents where we need active references we are left with sysfs attributes (binary or not). - Tweak sysfs_deactivate to only do something on attributes - Move lockdep initialization into sysfs_file_add_mode to limit it to just attributes. Signed-off-by: Eric W. Biederman Acked-by: WANG Cong Cc: Tejun Heo Signed-off-by: Greg Kroah-Hartman --- fs/sysfs/file.c | 1 + 1 file changed, 1 insertion(+) (limited to 'fs/sysfs/file.c') diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c index 40961366e929..e222b2582746 100644 --- a/fs/sysfs/file.c +++ b/fs/sysfs/file.c @@ -509,6 +509,7 @@ int sysfs_add_file_mode(struct sysfs_dirent *dir_sd, if (!sd) return -ENOMEM; sd->s_attr.attr = (void *)attr; + sysfs_dirent_init_lockdep(sd); sysfs_addrm_start(&acxt, dir_sd); rc = sysfs_add_one(&acxt, sd); -- cgit v1.2.3