diff options
| -rw-r--r-- | fs/relayfs/buffers.c | 2 | ||||
| -rw-r--r-- | fs/relayfs/relay.c | 30 | ||||
| -rw-r--r-- | include/linux/relayfs_fs.h | 34 |
3 files changed, 63 insertions, 3 deletions
diff --git a/fs/relayfs/buffers.c b/fs/relayfs/buffers.c index 667b529944c504..10187812771ef5 100644 --- a/fs/relayfs/buffers.c +++ b/fs/relayfs/buffers.c @@ -185,6 +185,6 @@ void relay_destroy_buf(struct rchan_buf *buf) void relay_remove_buf(struct kref *kref) { struct rchan_buf *buf = container_of(kref, struct rchan_buf, kref); - relayfs_remove(buf->dentry); + buf->chan->cb->remove_buf_file(buf->dentry); relay_destroy_buf(buf); } diff --git a/fs/relayfs/relay.c b/fs/relayfs/relay.c index a9cd5585c45ca3..b9bb569032729e 100644 --- a/fs/relayfs/relay.c +++ b/fs/relayfs/relay.c @@ -80,11 +80,33 @@ static void buf_unmapped_default_callback(struct rchan_buf *buf, { } +/* + * create_buf_file_create() default callback. Creates file to represent buf. + */ +static struct dentry *create_buf_file_default_callback(const char *filename, + struct dentry *parent, + int mode, + struct rchan_buf *buf) +{ + return relayfs_create_file(filename, parent, mode, + &relayfs_file_operations, buf); +} + +/* + * remove_buf_file() default callback. Removes file representing relay buffer. + */ +static int remove_buf_file_default_callback(struct dentry *dentry) +{ + return relayfs_remove(dentry); +} + /* relay channel default callbacks */ static struct rchan_callbacks default_channel_callbacks = { .subbuf_start = subbuf_start_default_callback, .buf_mapped = buf_mapped_default_callback, .buf_unmapped = buf_unmapped_default_callback, + .create_buf_file = create_buf_file_default_callback, + .remove_buf_file = remove_buf_file_default_callback, }; /** @@ -176,8 +198,8 @@ static struct rchan_buf *relay_open_buf(struct rchan *chan, return NULL; /* Create file in fs */ - dentry = relayfs_create_file(filename, parent, S_IRUSR, - &relayfs_file_operations, buf); + dentry = chan->cb->create_buf_file(filename, parent, S_IRUSR, + buf); if (!dentry) { relay_destroy_buf(buf); return NULL; @@ -220,6 +242,10 @@ static inline void setup_callbacks(struct rchan *chan, cb->buf_mapped = buf_mapped_default_callback; if (!cb->buf_unmapped) cb->buf_unmapped = buf_unmapped_default_callback; + if (!cb->create_buf_file) + cb->create_buf_file = create_buf_file_default_callback; + if (!cb->remove_buf_file) + cb->remove_buf_file = remove_buf_file_default_callback; chan->cb = cb; } diff --git a/include/linux/relayfs_fs.h b/include/linux/relayfs_fs.h index 8200ecbe6e0f51..8c21771058571f 100644 --- a/include/linux/relayfs_fs.h +++ b/include/linux/relayfs_fs.h @@ -110,6 +110,40 @@ struct rchan_callbacks */ void (*buf_unmapped)(struct rchan_buf *buf, struct file *filp); + /* + * create_buf_file - create file to represent a relayfs channel buffer + * @filename: the name of the file to create + * @parent: the parent of the file to create + * @mode: the mode of the file to create + * @buf: the channel buffer + * + * Called during relay_open(), once for each per-cpu buffer, + * to allow the client to create a file to be used to + * represent the corresponding channel buffer. If the file is + * created outside of relayfs, the parent must also exist in + * that filesystem. + * + * The callback should return the dentry of the file created + * to represent the relay buffer. + * + * See Documentation/filesystems/relayfs.txt for more info. + */ + struct dentry *(*create_buf_file)(const char *filename, + struct dentry *parent, + int mode, + struct rchan_buf *buf); + + /* + * remove_buf_file - remove file representing a relayfs channel buffer + * @dentry: the dentry of the file to remove + * + * Called during relay_close(), once for each per-cpu buffer, + * to allow the client to remove a file used to represent a + * channel buffer. + * + * The callback should return 0 if successful, negative if not. + */ + int (*remove_buf_file)(struct dentry *dentry); }; /* |