Messages in this thread Patch in this message | | | From | (Eric W. Biederman) | Date | Thu, 22 Jan 2009 08:49:21 -0800 | Subject | [PATCH] sysfs: Reference sysfs_dirent from sysfs inodes. |
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The sysfs_dirent serves as both an inode and a directory entry for sysfs. To prevent the sysfs inode numbers from being freed prematurely hold a reference to sysfs_dirent from the sysfs inode.
Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com> --- fs/sysfs/inode.c | 10 ++++++++++ fs/sysfs/mount.c | 1 + fs/sysfs/sysfs.h | 1 + 3 files changed, 12 insertions(+), 0 deletions(-)
diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c index dfa3d94..dd269df 100644 --- a/fs/sysfs/inode.c +++ b/fs/sysfs/inode.c @@ -147,6 +147,7 @@ static void sysfs_init_inode(struct sysfs_dirent *sd, struct inode *inode) { struct bin_attribute *bin_attr; + inode->i_private = sysfs_get(sd); inode->i_mapping->a_ops = &sysfs_aops; inode->i_mapping->backing_dev_info = &sysfs_backing_dev_info; inode->i_op = &sysfs_inode_operations; @@ -214,6 +215,15 @@ struct inode * sysfs_get_inode(struct sysfs_dirent *sd) return inode; } +void sysfs_delete_inode(struct inode *inode) +{ + struct sysfs_dirent *sd = inode->i_private; + + truncate_inode_pages(&inode->i_data, 0); + clear_inode(inode); + sysfs_put(sd); +} + int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name) { struct sysfs_addrm_cxt acxt; diff --git a/fs/sysfs/mount.c b/fs/sysfs/mount.c index f3e34fd..59fcd58 100644 --- a/fs/sysfs/mount.c +++ b/fs/sysfs/mount.c @@ -30,6 +30,7 @@ struct kmem_cache *sysfs_dir_cachep; static const struct super_operations sysfs_ops = { .statfs = simple_statfs, .drop_inode = generic_delete_inode, + .delete_inode = sysfs_delete_inode, }; struct sysfs_dirent sysfs_root = { diff --git a/fs/sysfs/sysfs.h b/fs/sysfs/sysfs.h index 93c6d6b..9055d04 100644 --- a/fs/sysfs/sysfs.h +++ b/fs/sysfs/sysfs.h @@ -145,6 +145,7 @@ static inline void __sysfs_put(struct sysfs_dirent *sd) * inode.c */ struct inode *sysfs_get_inode(struct sysfs_dirent *sd); +void sysfs_delete_inode(struct inode *inode); 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); -- 1.5.6.3
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