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| author |   Eric W. Biederman <ebiederm@xmission.com> | 2007-08-20 21:36:30 +0900 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@suse.de> | 2007-10-12 14:51:08 -0700 |
| commit | 932ea2e374dd1ca26676297a5eccd1cdab86f7cd (patch) | |
| tree | 83bba794de7f1f9f9290192f4f95a8ed9c91dfb6 /fs/sysfs/sysfs.h | |
| parent | sysfs: Rewrite sysfs_drop_dentry. (diff) | |
| download | linux-dev-932ea2e374dd1ca26676297a5eccd1cdab86f7cd.tar.xz linux-dev-932ea2e374dd1ca26676297a5eccd1cdab86f7cd.zip | |
sysfs: Introduce sysfs_rename_mutex
Looking carefully at the rename code we have a subtle dependency
that the structure of sysfs not change while we are performing
a rename. If the parent directory of the object we are renaming
changes while the rename is being performed nasty things could
happen when we go to release our locks.
So introduce a sysfs_rename_mutex to prevent this highly
unlikely theoretical issue.
In addition hold sysfs_rename_mutex over all calls to
sysfs_get_dentry. Allowing sysfs_get_dentry to be simplified
in the future.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Tejun Heo <htejun@gmail.com>
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs/sysfs/sysfs.h')
| -rw-r--r-- | fs/sysfs/sysfs.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/sysfs/sysfs.h b/fs/sysfs/sysfs.h index 77253aabc4af..179e6a26ece1 100644 --- a/fs/sysfs/sysfs.h +++ b/fs/sysfs/sysfs.h @@ -90,6 +90,7 @@ extern int sysfs_setattr(struct dentry *dentry, struct iattr *iattr); extern spinlock_t sysfs_assoc_lock; extern struct mutex sysfs_mutex; +extern struct mutex sysfs_rename_mutex; extern struct super_block * sysfs_sb; extern const struct file_operations sysfs_dir_operations; extern const struct file_operations sysfs_file_operations; |