diff options
| author |   Tejun Heo <tj@kernel.org> | 2016-12-27 14:49:03 -0500 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2016-12-27 14:49:03 -0500 |
| commit | 0e67db2f9fe91937e798e3d7d22c50a8438187e1 (patch) | |
| tree | f89b0ef7b69fd5b48dcb76d6568e4963ebc19779 /include/linux/kernfs.h | |
| parent | kernfs: make kernfs_open_file->mmapped a bitfield (diff) | |
| download | linux-dev-0e67db2f9fe91937e798e3d7d22c50a8438187e1.tar.xz linux-dev-0e67db2f9fe91937e798e3d7d22c50a8438187e1.zip | |
kernfs: add kernfs_ops->open/release() callbacks
Add ->open/release() methods to kernfs_ops. ->open() is called when
the file is opened and ->release() when the file is either released or
severed. These callbacks can be used, for example, to manage
persistent caching objects over multiple seq_file iterations.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Acked-by: Zefan Li <lizefan@huawei.com>
Diffstat (limited to 'include/linux/kernfs.h')
| -rw-r--r-- | include/linux/kernfs.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/kernfs.h b/include/linux/kernfs.h index afd4e5abc4fb..a9b11b8d06f2 100644 --- a/include/linux/kernfs.h +++ b/include/linux/kernfs.h @@ -46,6 +46,7 @@ enum kernfs_node_flag { KERNFS_SUICIDAL = 0x0400, KERNFS_SUICIDED = 0x0800, KERNFS_EMPTY_DIR = 0x1000, + KERNFS_HAS_RELEASE = 0x2000, }; /* @flags for kernfs_create_root() */ @@ -175,6 +176,7 @@ struct kernfs_open_file { /* published fields */ struct kernfs_node *kn; struct file *file; + struct seq_file *seq_file; void *priv; /* private fields, do not use outside kernfs proper */ @@ -186,11 +188,19 @@ struct kernfs_open_file { size_t atomic_write_len; bool mmapped:1; + bool released:1; const struct vm_operations_struct *vm_ops; }; struct kernfs_ops { /* + * Optional open/release methods. Both are called with + * @of->seq_file populated. + */ + int (*open)(struct kernfs_open_file *of); + void (*release)(struct kernfs_open_file *of); + + /* * Read is handled by either seq_file or raw_read(). * * If seq_show() is present, seq_file path is active. Other seq |