From: Amir Goldstein <amir73il@gmail.com>
To: Miklos Szeredi <miklos@szeredi.hu>
Cc: Al Viro <viro@zeniv.linux.org.uk>,
linux-unionfs@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: [PATCH v2 14/20] ovl: defer upper dir lock to tempfile link
Date: Wed, 7 Jun 2017 10:51:18 +0300 [thread overview]
Message-ID: <1496821884-5178-15-git-send-email-amir73il@gmail.com> (raw)
In-Reply-To: <1496821884-5178-1-git-send-email-amir73il@gmail.com>
On copy up of regular file using an O_TMPFILE, lock upper dir only
before linking the tempfile in place.
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
---
fs/overlayfs/copy_up.c | 35 ++++++++++++++++++-----------------
fs/overlayfs/util.c | 3 ++-
2 files changed, 20 insertions(+), 18 deletions(-)
diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c
index ae18824c7944..f6570bc127e7 100644
--- a/fs/overlayfs/copy_up.c
+++ b/fs/overlayfs/copy_up.c
@@ -336,8 +336,13 @@ static int ovl_copy_up_locked(struct dentry *workdir, struct dentry *upperdir,
.link = link
};
- upper = lookup_one_len(dentry->d_name.name, upperdir,
- dentry->d_name.len);
+ if (tmpfile) {
+ upper = lookup_one_len_unlocked(dentry->d_name.name, upperdir,
+ dentry->d_name.len);
+ } else {
+ upper = lookup_one_len(dentry->d_name.name, upperdir,
+ dentry->d_name.len);
+ }
err = PTR_ERR(upper);
if (IS_ERR(upper))
goto out;
@@ -377,16 +382,7 @@ static int ovl_copy_up_locked(struct dentry *workdir, struct dentry *upperdir,
BUG_ON(upperpath.dentry != NULL);
upperpath.dentry = temp;
- if (tmpfile) {
- inode_unlock(udir);
- err = ovl_copy_up_data(lowerpath, &upperpath,
- stat->size);
- inode_lock_nested(udir, I_MUTEX_PARENT);
- } else {
- err = ovl_copy_up_data(lowerpath, &upperpath,
- stat->size);
- }
-
+ err = ovl_copy_up_data(lowerpath, &upperpath, stat->size);
if (err)
goto out_cleanup;
}
@@ -409,10 +405,16 @@ static int ovl_copy_up_locked(struct dentry *workdir, struct dentry *upperdir,
if (err)
goto out_cleanup;
- if (tmpfile)
+ if (tmpfile) {
+ inode_lock_nested(udir, I_MUTEX_PARENT);
err = ovl_do_link(temp, udir, upper, true);
- else
+ if (!err)
+ ovl_set_timestamps(upperdir, pstat);
+ pstat = NULL;
+ inode_unlock(udir);
+ } else {
err = ovl_do_rename(wdir, temp, udir, upper, 0);
+ }
if (err)
goto out_cleanup;
@@ -425,7 +427,8 @@ static int ovl_copy_up_locked(struct dentry *workdir, struct dentry *upperdir,
}
/* Restore timestamps on parent (best effort) */
- ovl_set_timestamps(upperdir, pstat);
+ if (pstat)
+ ovl_set_timestamps(upperdir, pstat);
out2:
dput(temp);
out1:
@@ -496,10 +499,8 @@ static int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry,
goto out_done;
}
- inode_lock_nested(upperdir->d_inode, I_MUTEX_PARENT);
err = ovl_copy_up_locked(workdir, upperdir, dentry, lowerpath,
stat, link, &pstat, true);
- inode_unlock(upperdir->d_inode);
ovl_copy_up_end(dentry);
goto out_done;
}
diff --git a/fs/overlayfs/util.c b/fs/overlayfs/util.c
index c42eb2eb9313..a28bf55a0d48 100644
--- a/fs/overlayfs/util.c
+++ b/fs/overlayfs/util.c
@@ -246,7 +246,8 @@ void ovl_dentry_update(struct dentry *dentry, struct dentry *upperdentry)
{
struct ovl_entry *oe = dentry->d_fsdata;
- WARN_ON(!inode_is_locked(upperdentry->d_parent->d_inode));
+ WARN_ON(!inode_is_locked(upperdentry->d_parent->d_inode) &&
+ !oe->copying);
WARN_ON(oe->__upperdentry);
/*
* Make sure upperdentry is consistent before making it visible to
--
2.7.4
next prev parent reply other threads:[~2017-06-07 7:51 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-07 7:51 [PATCH v2 00/20] Overlayfs inodes index Amir Goldstein
2017-06-07 7:51 ` [PATCH v2 01/20] vfs: introduce inode 'inuse' lock Amir Goldstein
2017-06-07 7:51 ` [PATCH v2 02/20] ovl: get exclusive ownership on upper/work dirs Amir Goldstein
2017-06-07 7:51 ` [PATCH v2 03/20] ovl: relax same fs constrain for ovl_check_origin() Amir Goldstein
2017-06-07 7:51 ` [PATCH v2 04/20] ovl: generalize ovl_create_workdir() Amir Goldstein
2017-06-07 7:51 ` [PATCH v2 05/20] ovl: introduce the inodes index dir feature Amir Goldstein
2017-06-07 7:51 ` [PATCH v2 06/20] ovl: verify upper root dir matches lower root dir Amir Goldstein
2017-06-07 7:51 ` [PATCH v2 07/20] ovl: verify index dir matches upper dir Amir Goldstein
2017-06-07 7:51 ` [PATCH v2 08/20] ovl: lookup index entry for non-dir Amir Goldstein
2017-06-08 12:11 ` Miklos Szeredi
2017-06-08 14:48 ` Amir Goldstein
2017-06-08 15:17 ` Miklos Szeredi
2017-06-08 16:09 ` Amir Goldstein
2017-06-09 8:43 ` Miklos Szeredi
2017-06-09 9:38 ` Amir Goldstein
2017-06-09 11:49 ` Miklos Szeredi
2017-06-09 13:14 ` Miklos Szeredi
2017-06-09 13:24 ` Amir Goldstein
2017-06-09 13:29 ` Miklos Szeredi
2017-06-09 22:56 ` Amir Goldstein
2017-06-07 7:51 ` [PATCH v2 09/20] ovl: move inode helpers to inode.c Amir Goldstein
2017-06-07 7:51 ` [PATCH v2 10/20] ovl: use ovl_inode_init() for initializing new inode Amir Goldstein
2017-06-07 7:51 ` [PATCH v2 11/20] ovl: hash overlay non-dir inodes by copy up origin inode Amir Goldstein
2017-06-07 7:51 ` [PATCH v2 12/20] ovl: fix nlink leak in ovl_rename() Amir Goldstein
2017-06-07 7:51 ` [PATCH v2 13/20] ovl: adjust overlay inode nlink for indexed inodes Amir Goldstein
2017-06-07 7:51 ` Amir Goldstein [this message]
2017-06-07 7:51 ` [PATCH v2 15/20] ovl: factor out ovl_copy_up_inode() helper Amir Goldstein
2017-06-07 7:51 ` [PATCH v2 16/20] ovl: generalize ovl_copy_up_locked() using actors Amir Goldstein
2017-06-07 7:51 ` [PATCH v2 17/20] ovl: generalize ovl_copy_up_one() " Amir Goldstein
2017-06-07 7:51 ` [PATCH v2 18/20] ovl: implement index dir copy up method Amir Goldstein
2017-06-07 7:51 ` [PATCH v2 19/20] ovl: handle race of concurrent lower hardlinks copy up Amir Goldstein
2017-06-07 7:51 ` [PATCH v2 20/20] ovl: constant inode number for hardlinks Amir Goldstein
2017-06-07 7:54 ` [PATCH v2 00/20] Overlayfs inodes index Miklos Szeredi
2017-06-07 7:58 ` Amir Goldstein
2017-06-07 14:58 ` Amir Goldstein
2017-06-08 15:00 ` [PATCH v2 21/23] ovl: use inodes index on readonly mount Amir Goldstein
2017-06-08 15:00 ` [PATCH v2 22/23] ovl: move copy up helpers to copy_up.c Amir Goldstein
2017-06-08 15:00 ` [PATCH v2 23/23] ovl: copy up on read operations on indexed lower Amir Goldstein
2017-06-07 17:17 ` [PATCH v2 00/20] Overlayfs inodes index J. Bruce Fields
2017-06-07 18:36 ` Amir Goldstein
2017-06-07 18:59 ` J. Bruce Fields
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1496821884-5178-15-git-send-email-amir73il@gmail.com \
--to=amir73il@gmail.com \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-unionfs@vger.kernel.org \
--cc=miklos@szeredi.hu \
--cc=viro@zeniv.linux.org.uk \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).