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vma: Add comments about some dump fields of vma_area

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We have non-obvious handling of vm_file_fd/vm_socket_id
pair and the vma->file_borrowed.

Comment these to in the structure.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Pavel Emelyanov 2014-09-23 20:31:46 +04:00
parent cf8c9ae870
commit f84d19e09a
1 changed files with 11 additions and 0 deletions
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11
include/vma.h
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@ -30,6 +30,12 @@ struct vma_area {
union {
struct /* for dump */ {
union {
/*
* These two cannot be assigned at once.
* The file_fd is an fd for a regular file and
* the socket_id is the inode number of the
* mapped (PF_PACKET) socket.
*/
int vm_file_fd;
int vm_socket_id;
};
@ -37,6 +43,11 @@ struct vma_area {
char *aufs_rpath; /* path from aufs root */
char *aufs_fpath; /* full path from global root */
/*
* When several subsequent vmas have the same
* dev:ino pair all 'tail' ones set this to true
* and the vmst points to the head's stat buf.
*/
bool file_borrowed;
struct stat *vmst;
};