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fsnotify: Retrieve super block from the data field

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[ Upstream commit 29335033c574a15334015d8c4e36862cff3d3384 ]

Some file system events (i.e. FS_ERROR) might not be associated with an
inode or directory.  For these, we can retrieve the super block from the
data field.  But, since the super_block is available in the data field
on every event type, simplify the code to always retrieve it from there,
through a new helper.

Link: https://lore.kernel.org/r/20211025192746.66445-11-krisman@collabora.com
Suggested-by: Jan Kara <jack@suse.cz>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Gabriel Krisman Bertazi
2021-10-25 16:27:25 -03:00
committed by Greg Kroah-Hartman
parent 44844158ee
commit 5c4ce075c9
2 changed files with 18 additions and 4 deletions
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15
include/linux/fsnotify_backend.h
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@@ -289,6 +289,21 @@ static inline const struct path *fsnotify_data_path(const void *data,
}
}
static inline struct super_block *fsnotify_data_sb(const void *data,
int data_type)
{
switch (data_type) {
case FSNOTIFY_EVENT_INODE:
return ((struct inode *)data)->i_sb;
case FSNOTIFY_EVENT_DENTRY:
return ((struct dentry *)data)->d_sb;
case FSNOTIFY_EVENT_PATH:
return ((const struct path *)data)->dentry->d_sb;
default:
return NULL;
}
}
enum fsnotify_obj_type {
FSNOTIFY_OBJ_TYPE_INODE,
FSNOTIFY_OBJ_TYPE_PARENT,