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Date: Sat, 16 Feb 2008 21:57:21 -0500
From: Erez Zadok <ezk@...sunysb.edu>
To: akpm@...ux-foundation.org
Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
viro@....linux.org.uk, hch@...radead.org,
Erez Zadok <ezk@...sunysb.edu>
Subject: [PATCH 12/17] Unionfs: branch management/configuration fixes
Remove unnecessary calls to update branch m/ctimes, and use them only when
needed. Update branch vfsmounts after operations that could cause a copyup.
Signed-off-by: Erez Zadok <ezk@...sunysb.edu>
---
fs/unionfs/commonfops.c | 9 +++------
fs/unionfs/copyup.c | 3 ++-
fs/unionfs/dentry.c | 1 +
fs/unionfs/mmap.c | 17 ++++-------------
fs/unionfs/rename.c | 7 +++++--
5 files changed, 15 insertions(+), 22 deletions(-)
diff --git a/fs/unionfs/commonfops.c b/fs/unionfs/commonfops.c
index 491e2ff..2add167 100644
--- a/fs/unionfs/commonfops.c
+++ b/fs/unionfs/commonfops.c
@@ -604,6 +604,7 @@ out:
}
out_nofree:
if (!err) {
+ unionfs_postcopyup_setmnt(dentry);
unionfs_copy_attr_times(inode);
unionfs_check_file(file);
unionfs_check_inode(inode);
@@ -839,13 +840,9 @@ int unionfs_flush(struct file *file, fl_owner_t id)
}
- /* on success, update our times */
- unionfs_copy_attr_times(dentry->d_inode);
- /* parent time could have changed too (async) */
- unionfs_copy_attr_times(dentry->d_parent->d_inode);
-
out:
- unionfs_check_file(file);
+ if (!err)
+ unionfs_check_file(file);
unionfs_unlock_dentry(file->f_path.dentry);
unionfs_read_unlock(dentry->d_sb);
return err;
diff --git a/fs/unionfs/copyup.c b/fs/unionfs/copyup.c
index 9beac01..f71bddf 100644
--- a/fs/unionfs/copyup.c
+++ b/fs/unionfs/copyup.c
@@ -819,7 +819,8 @@ begin:
* update times of this dentry, but also the parent, because if
* we changed, the parent may have changed too.
*/
- unionfs_copy_attr_times(parent_dentry->d_inode);
+ fsstack_copy_attr_times(parent_dentry->d_inode,
+ lower_parent_dentry->d_inode);
unionfs_copy_attr_times(child_dentry->d_inode);
parent_dentry = child_dentry;
diff --git a/fs/unionfs/dentry.c b/fs/unionfs/dentry.c
index 17b297d..a956b94 100644
--- a/fs/unionfs/dentry.c
+++ b/fs/unionfs/dentry.c
@@ -482,6 +482,7 @@ static int unionfs_d_revalidate(struct dentry *dentry, struct nameidata *nd)
unionfs_lock_dentry(dentry, UNIONFS_DMUTEX_CHILD);
err = __unionfs_d_revalidate_chain(dentry, nd, false);
if (likely(err > 0)) { /* true==1: dentry is valid */
+ unionfs_postcopyup_setmnt(dentry);
unionfs_check_dentry(dentry);
unionfs_check_nd(nd);
}
diff --git a/fs/unionfs/mmap.c b/fs/unionfs/mmap.c
index ad770ac..d6ac61e 100644
--- a/fs/unionfs/mmap.c
+++ b/fs/unionfs/mmap.c
@@ -227,20 +227,11 @@ static int unionfs_prepare_write(struct file *file, struct page *page,
int err;
unionfs_read_lock(file->f_path.dentry->d_sb, UNIONFS_SMUTEX_PARENT);
- /*
- * This is the only place where we unconditionally copy the lower
- * attribute times before calling unionfs_file_revalidate. The
- * reason is that our ->write calls do_sync_write which in turn will
- * call our ->prepare_write and then ->commit_write. Before our
- * ->write is called, the lower mtimes are in sync, but by the time
- * the VFS calls our ->commit_write, the lower mtimes have changed.
- * Therefore, the only reasonable time for us to sync up from the
- * changed lower mtimes, and avoid an invariant violation warning,
- * is here, in ->prepare_write.
- */
- unionfs_copy_attr_times(file->f_path.dentry->d_inode);
err = unionfs_file_revalidate(file, true);
- unionfs_check_file(file);
+ if (!err) {
+ unionfs_copy_attr_times(file->f_path.dentry->d_inode);
+ unionfs_check_file(file);
+ }
unionfs_read_unlock(file->f_path.dentry->d_sb);
return err;
diff --git a/fs/unionfs/rename.c b/fs/unionfs/rename.c
index 5ab13f9..cc16eb2 100644
--- a/fs/unionfs/rename.c
+++ b/fs/unionfs/rename.c
@@ -138,6 +138,11 @@ static int __unionfs_rename(struct inode *old_dir, struct dentry *old_dentry,
err = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry,
lower_new_dir_dentry->d_inode, lower_new_dentry);
out_err_unlock:
+ if (!err) {
+ /* update parent dir times */
+ fsstack_copy_attr_times(old_dir, lower_old_dir_dentry->d_inode);
+ fsstack_copy_attr_times(new_dir, lower_new_dir_dentry->d_inode);
+ }
unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
lockdep_on();
@@ -526,8 +531,6 @@ int unionfs_rename(struct inode *old_dir, struct dentry *old_dentry,
}
}
/* if all of this renaming succeeded, update our times */
- unionfs_copy_attr_times(old_dir);
- unionfs_copy_attr_times(new_dir);
unionfs_copy_attr_times(old_dentry->d_inode);
unionfs_copy_attr_times(new_dentry->d_inode);
unionfs_check_inode(old_dir);
--
1.5.2.2
--
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