From: Valerie Aurora <valerie.aurora@gmail.com>
To: linux-fsdevel@vger.kernel.org, linux@vger.kernel.org
Cc: viro@zeniv.linux.org.uk, Valerie Aurora <vaurora@redhat.com>,
Valerie Aurora <valerie.aurora@gmail.com>
Subject: [PATCH 65/74] union-mount: Implement union-aware link()
Date: Tue, 22 Mar 2011 19:04:56 -0700 [thread overview]
Message-ID: <1300845905-14433-22-git-send-email-valerie.aurora@gmail.com> (raw)
In-Reply-To: <1300845905-14433-1-git-send-email-valerie.aurora@gmail.com>
From: Valerie Aurora <vaurora@redhat.com>
Signed-off-by: Valerie Aurora <valerie.aurora@gmail.com>
---
fs/namei.c | 24 ++++++++++++++++++++----
1 files changed, 20 insertions(+), 4 deletions(-)
diff --git a/fs/namei.c b/fs/namei.c
index 5eec62c..6ea9cdc 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2976,16 +2976,18 @@ SYSCALL_DEFINE5(linkat, int, olddfd, const char __user *, oldname,
{
struct dentry *new_dentry;
struct nameidata nd;
+ struct nameidata old_nd;
struct path old_path;
int error;
char *to;
+ char *from;
if ((flags & ~AT_SYMLINK_FOLLOW) != 0)
return -EINVAL;
- error = user_path_at(olddfd, oldname,
+ error = user_path_nd(olddfd, oldname,
flags & AT_SYMLINK_FOLLOW ? LOOKUP_FOLLOW : 0,
- &old_path);
+ &old_nd, &old_path, &from);
if (error)
return error;
@@ -2993,8 +2995,20 @@ SYSCALL_DEFINE5(linkat, int, olddfd, const char __user *, oldname,
if (error)
goto out;
error = -EXDEV;
- if (old_path.mnt != nd.path.mnt)
- goto out_release;
+ if (old_path.mnt != nd.path.mnt) {
+ if (IS_DIR_UNIONED(old_nd.path.dentry) &&
+ (old_nd.path.mnt == nd.path.mnt)) {
+ error = mnt_want_write(old_nd.path.mnt);
+ if (error)
+ goto out_release;
+ error = union_copyup(&old_nd, &old_path);
+ mnt_drop_write(old_nd.path.mnt);
+ if (error)
+ goto out_release;
+ } else {
+ goto out_release;
+ }
+ }
new_dentry = lookup_create(&nd, 0);
error = PTR_ERR(new_dentry);
if (IS_ERR(new_dentry))
@@ -3017,6 +3031,8 @@ out_release:
putname(to);
out:
path_put(&old_path);
+ path_put(&old_nd.path);
+ putname(from);
return error;
}
--
1.7.0.4
next prev parent reply other threads:[~2011-03-23 2:06 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-23 2:04 [PATCH 44/74] union-mount: Temporarily disable some syscalls Valerie Aurora
2011-03-23 2:04 ` [PATCH 45/74] union-mount: Basic infrastructure of __lookup_union() Valerie Aurora
2011-03-23 2:04 ` [PATCH 46/74] union-mount: Process negative dentries in __lookup_union() Valerie Aurora
2011-03-23 2:04 ` [PATCH 47/74] union-mount: Return files found in lower layers " Valerie Aurora
2011-03-23 2:04 ` [PATCH 48/74] union-mount: Build union stack " Valerie Aurora
2011-03-23 2:04 ` [PATCH 49/74] union-mount: Follow mount " Valerie Aurora
2011-03-23 2:04 ` [PATCH 50/74] union-mount: Add lookup_union() Valerie Aurora
2011-03-23 2:04 ` [PATCH 51/74] union-mount: Add do_lookup_union() wrapper for __lookup_union() Valerie Aurora
2011-03-23 2:04 ` [PATCH 52/74] union-mount: Call union lookup functions in lookup path Valerie Aurora
2011-03-23 2:04 ` [PATCH 53/74] union-mount: Create whiteout on unlink() Valerie Aurora
2011-03-23 2:04 ` [PATCH 54/74] union-mount: Create whiteout on rmdir() Valerie Aurora
2011-03-23 2:04 ` [PATCH 55/74] union-mount: Set opaque flag on new directories in unioned file systems Valerie Aurora
2011-03-23 2:04 ` [PATCH 56/74] union-mount: Copy up directory entries on first readdir() Valerie Aurora
2011-03-23 2:04 ` [PATCH 57/74] union-mount: Add generic_readdir_fallthru() helper Valerie Aurora
2011-03-23 2:04 ` [PATCH 58/74] fallthru: ext2 support for lookup of d_type/d_ino in fallthrus Valerie Aurora
2011-03-23 2:04 ` [PATCH 59/74] fallthru: tmpfs " Valerie Aurora
2011-03-23 2:04 ` [PATCH 60/74] fallthru: jffs2 " Valerie Aurora
2011-03-23 2:04 ` [PATCH 61/74] VFS: Split inode_permission() and create path_permission() Valerie Aurora
2011-03-23 2:04 ` [PATCH 62/74] VFS: Create user_path_nd() to lookup both parent and target Valerie Aurora
2011-03-23 2:04 ` [PATCH 63/74] union-mount: In-kernel file copyup routines Valerie Aurora
2011-03-23 2:04 ` [PATCH 64/74] union-mount: Implement union-aware access()/faccessat() Valerie Aurora
2011-03-23 2:04 ` Valerie Aurora [this message]
2011-03-23 2:04 ` [PATCH 66/74] union-mount: Implement union-aware rename() Valerie Aurora
2011-03-23 2:04 ` [PATCH 67/74] union-mount: Implement union-aware writable open() Valerie Aurora
2011-03-23 2:04 ` [PATCH 68/74] union-mount: Implement union-aware chown() Valerie Aurora
2011-03-23 2:05 ` [PATCH 69/74] union-mount: Implement union-aware truncate() Valerie Aurora
2011-03-23 2:05 ` [PATCH 70/74] union-mount: Implement union-aware chmod()/fchmodat() Valerie Aurora
2011-03-23 2:05 ` [PATCH 71/74] union-mount: Implement union-aware lchown() Valerie Aurora
2011-03-23 2:05 ` [PATCH 72/74] union-mount: Implement union-aware utimensat() Valerie Aurora
2011-03-23 2:05 ` [PATCH 73/74] union-mount: Implement union-aware setxattr() Valerie Aurora
2011-03-23 2:05 ` [PATCH 74/74] union-mount: Implement union-aware lsetxattr() Valerie Aurora
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