lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Thu, 16 Sep 2010 15:12:00 -0700 From: Valerie Aurora <vaurora@...hat.com> To: Alexander Viro <viro@...iv.linux.org.uk> Cc: Miklos Szeredi <miklos@...redi.hu>, Christoph Hellwig <hch@...radead.org>, Andreas Gruenbacher <agruen@...e.de>, Nick Piggin <npiggin@...nel.dk>, linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org, Valerie Aurora <vaurora@...hat.com> Subject: [PATCH 09/34] union-mount: Add two superblock fields for union mounts Add two fields to struct super_block to support union mounts. s_union_lower_mnts is a pointer to a cloned vfsmount tree of all the lower (read-only) mounts unioned with the topmost (read-write) vfsmount. These mounts may have submounts which will also be unioned; hence we copy the entire vfsmount tree, not just the root vfsmounts. s_union_count is the number of lower mounts unioned at the root of the file system. This count is the maximum number of directories that will ever be unioned with a single directory. We use it to allocate a union stack of the correct size for each directory. Signed-off-by: Valerie Aurora <vaurora@...hat.com> --- include/linux/fs.h | 12 ++++++++++++ 1 files changed, 12 insertions(+), 0 deletions(-) diff --git a/include/linux/fs.h b/include/linux/fs.h index 2e3d745..5e35b03 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -1397,6 +1397,18 @@ struct super_block { * Decremented by free_vfsmnt() if MNT_HARD_READONLY is set. */ int s_hard_readonly_users; + + /* + * Root of the private cloned vfsmount tree of the read-only + * mounts in this union (set in topmost vfsmount only) + */ + struct vfsmount *s_union_lower_mnts; + + /* + * Number of layers in this union, not counting the topmost or + * submounts. + */ + unsigned int s_union_count; }; extern struct timespec current_fs_time(struct super_block *sb); -- 1.6.3.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists