From: Jeff Layton <jlayton@redhat.com>
To: viro@ZenIV.linux.org.uk
Cc: linux-fsdevel@vger.kernel.org, linux-nfs@vger.kernel.org,
linux-kernel@vger.kernel.org, michael.brantley@deshaw.com,
hch@infradead.org, miklos@szeredi.hu, pstaubach@exagrid.com
Subject: [PATCH v4 10/17] vfs: fix symlinkat to retry on ESTALE errors
Date: Thu, 26 Jul 2012 07:55:13 -0400 [thread overview]
Message-ID: <1343303720-11199-11-git-send-email-jlayton@redhat.com> (raw)
In-Reply-To: <1343303720-11199-1-git-send-email-jlayton@redhat.com>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
---
fs/namei.c | 43 ++++++++++++++++++++++++++-----------------
1 file changed, 26 insertions(+), 17 deletions(-)
diff --git a/fs/namei.c b/fs/namei.c
index 4bec3f4..5a81c48 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -3340,33 +3340,42 @@ SYSCALL_DEFINE3(symlinkat, const char __user *, oldname,
int, newdfd, const char __user *, newname)
{
int error;
- char *from;
+ char *from, *to;
struct dentry *dentry;
struct path path;
+ unsigned int try = 0;
from = getname(oldname);
if (IS_ERR(from))
return PTR_ERR(from);
- dentry = user_path_create(newdfd, newname, &path, 0);
- error = PTR_ERR(dentry);
- if (IS_ERR(dentry))
- goto out_putname;
+ to = getname(newname);
+ if (IS_ERR(to)) {
+ putname(from);
+ return PTR_ERR(to);
+ }
- error = mnt_want_write(path.mnt);
- if (error)
- goto out_dput;
- error = security_path_symlink(&path, dentry, from);
- if (error)
- goto out_drop_write;
- error = vfs_symlink(path.dentry->d_inode, dentry, from);
+ do {
+ dentry = kern_path_create(newdfd, to, &path, 0, try);
+ error = PTR_ERR(dentry);
+ if (IS_ERR(dentry))
+ break;
+
+ error = mnt_want_write(path.mnt);
+ if (error)
+ goto out_dput;
+ error = security_path_symlink(&path, dentry, from);
+ if (error)
+ goto out_drop_write;
+ error = vfs_symlink(path.dentry->d_inode, dentry, from);
out_drop_write:
- mnt_drop_write(path.mnt);
+ mnt_drop_write(path.mnt);
out_dput:
- dput(dentry);
- mutex_unlock(&path.dentry->d_inode->i_mutex);
- path_put(&path);
-out_putname:
+ dput(dentry);
+ mutex_unlock(&path.dentry->d_inode->i_mutex);
+ path_put(&path);
+ } while (retry_estale(error, try++));
+ putname(to);
putname(from);
return error;
}
--
1.7.11.2
next prev parent reply other threads:[~2012-07-26 11:55 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-26 11:55 [PATCH v4 00/17] vfs: add the ability to retry on ESTALE to several syscalls Jeff Layton
2012-07-26 11:55 ` [PATCH v4 01/17] vfs: add a retry_estale helper function to handle retries on ESTALE Jeff Layton
2012-07-26 11:55 ` [PATCH v4 03/17] vfs: make fstatat retry on ESTALE errors from getattr call Jeff Layton
2012-07-26 11:55 ` [PATCH v4 04/17] vfs: fix readlinkat to retry on ESTALE Jeff Layton
2012-07-26 11:55 ` [PATCH v4 05/17] vfs: remove user_path_at_empty Jeff Layton
2012-07-26 11:55 ` [PATCH v4 06/17] vfs: turn "empty" arg in getname_flags into a bool Jeff Layton
2012-07-26 11:55 ` [PATCH v4 07/17] vfs: add new "reval" argument to kern_path_create Jeff Layton
2012-07-26 11:55 ` [PATCH v4 08/17] vfs: fix mknodat to retry on ESTALE errors Jeff Layton
2012-07-26 11:55 ` [PATCH v4 09/17] vfs: fix mkdir " Jeff Layton
2012-07-26 11:55 ` Jeff Layton [this message]
2012-07-26 11:55 ` [PATCH v4 11/17] vfs: fix linkat " Jeff Layton
2012-07-26 11:55 ` [PATCH v4 12/17] vfs: make rmdir " Jeff Layton
2012-07-26 11:55 ` [PATCH v4 13/17] vfs: make do_unlinkat " Jeff Layton
2012-07-26 11:55 ` [PATCH v4 14/17] vfs: fix renameat to " Jeff Layton
2012-07-26 11:55 ` [PATCH v4 16/17] vfs: have do_sys_truncate retry once on an ESTALE error Jeff Layton
[not found] ` <1343303720-11199-1-git-send-email-jlayton-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-07-26 11:55 ` [PATCH v4 02/17] vfs: add a kern_path_at function Jeff Layton
2012-07-26 11:55 ` [PATCH v4 15/17] vfs: remove user_path_parent Jeff Layton
2012-07-26 11:55 ` [PATCH v4 17/17] vfs: have faccessat retry once on an ESTALE error Jeff Layton
2012-07-27 2:15 ` [PATCH v4 00/17] vfs: add the ability to retry on ESTALE to several syscalls Namjae Jeon
[not found] ` <CAKYAXd99VMYSX=k9eadB6MZvjQjQrOngOjUicjo+c9LtHvpz9w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-07-27 10:56 ` Jeff Layton
[not found] ` <20120727065630.0a3c5870-9yPaYZwiELC+kQycOl6kW4xkIHaj4LzF@public.gmane.org>
2012-08-01 1:52 ` Namjae Jeon
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