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Subject[PATCH 10/24] sysfs: Fix locking and factor out sysfs_sd_setattr
From: Eric W. Biederman <ebiederm@xmission.com>

Cleanly separate the work that is specific to setting the
attributes of a sysfs_dirent from what is needed to update
the attributes of a vfs inode.

Additionally grab the sysfs_mutex to keep any nasties from
surprising us when updating the sysfs_dirent.

Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com>
---
fs/sysfs/inode.c | 52 ++++++++++++++++++++++++++++++----------------------
fs/sysfs/sysfs.h | 1 +
2 files changed, 31 insertions(+), 22 deletions(-)
diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c
index 5020a1d..dd154cb 100644
--- a/fs/sysfs/inode.c
+++ b/fs/sysfs/inode.c
@@ -42,33 +42,12 @@ int __init sysfs_inode_init(void)
return bdi_init(&sysfs_backing_dev_info);
}

-int sysfs_setattr(struct dentry * dentry, struct iattr * iattr)
+int sysfs_sd_setattr(struct sysfs_dirent *sd, struct iattr * iattr)
{
- struct inode * inode = dentry->d_inode;
- struct sysfs_dirent * sd = dentry->d_fsdata;
struct iattr * sd_iattr;
unsigned int ia_valid = iattr->ia_valid;
- int error;
-
- if (!sd)
- return -EINVAL;

sd_iattr = sd->s_iattr;
-
- error = inode_change_ok(inode, iattr);
- if (error)
- return error;
-
- iattr->ia_valid &= ~ATTR_SIZE; /* ignore size changes */
- if (iattr->ia_valid & ATTR_MODE) {
- if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
- iattr->ia_mode &= ~S_ISGID;
- }
-
- error = inode_setattr(inode, iattr);
- if (error)
- return error;
-
if (!sd_iattr && (ia_valid & ~ATTR_MODE)) {
/* setting attributes for the first time, allocate now */
sd_iattr = kzalloc(sizeof(struct iattr), GFP_KERNEL);
@@ -103,6 +82,35 @@ int sysfs_setattr(struct dentry * dentry, struct iattr * iattr)
sd_iattr->ia_ctime = iattr->ia_ctime;
if (ia_valid & ATTR_MODE)
sd_iattr->ia_mode = iattr->ia_mode;
+ return 0;
+}
+
+int sysfs_setattr(struct dentry * dentry, struct iattr * iattr)
+{
+ struct inode * inode = dentry->d_inode;
+ struct sysfs_dirent * sd = dentry->d_fsdata;
+ int error;
+
+ if (!sd)
+ return -EINVAL;
+
+ error = inode_change_ok(inode, iattr);
+ if (error)
+ return error;
+
+ iattr->ia_valid &= ~ATTR_SIZE; /* ignore size changes */
+ if (iattr->ia_valid & ATTR_MODE) {
+ if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
+ iattr->ia_mode &= ~S_ISGID;
+ }
+
+ error = inode_setattr(inode, iattr);
+ if (error)
+ return error;
+
+ mutex_lock(&sysfs_mutex);
+ error = sysfs_sd_setattr(sd, iattr);
+ mutex_unlock(&sysfs_mutex);

return error;
}
diff --git a/fs/sysfs/sysfs.h b/fs/sysfs/sysfs.h
index abf05f4..043bb13 100644
--- a/fs/sysfs/sysfs.h
+++ b/fs/sysfs/sysfs.h
@@ -146,6 +146,7 @@ static inline void __sysfs_put(struct sysfs_dirent *sd)
*/
struct inode *sysfs_get_inode(struct sysfs_dirent *sd);
void sysfs_delete_inode(struct inode *inode);
+int sysfs_sd_setattr(struct sysfs_dirent *sd, struct iattr *iattr);
int sysfs_setattr(struct dentry *dentry, struct iattr *iattr);
int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name);
int sysfs_inode_init(void);
--
1.6.3.1.54.g99dd.dirty


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