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Subject[RFC][PATCH 11/20] elevate write count over calls to vfs_rename()
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Date


Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
---

lxc-dave/fs/namei.c | 4 ++++
lxc-dave/fs/nfsd/vfs.c | 12 +++++++++++-
2 files changed, 15 insertions(+), 1 deletion(-)

diff -puN fs/namei.c~C-elevate-writers-vfs_rename-part1 fs/namei.c
--- lxc/fs/namei.c~C-elevate-writers-vfs_rename-part1 2006-06-16 15:58:06.000000000 -0700
+++ lxc-dave/fs/namei.c 2006-06-16 15:58:06.000000000 -0700
@@ -2520,8 +2520,12 @@ static int do_rename(int olddfd, const c
if (new_dentry == trap)
goto exit5;

+ error = mnt_want_write(oldnd.mnt);
+ if (error)
+ goto exit5;
error = vfs_rename(old_dir->d_inode, old_dentry,
new_dir->d_inode, new_dentry);
+ mnt_drop_write(oldnd.mnt);
exit5:
dput(new_dentry);
exit4:
diff -puN fs/nfsd/vfs.c~C-elevate-writers-vfs_rename-part1 fs/nfsd/vfs.c
--- lxc/fs/nfsd/vfs.c~C-elevate-writers-vfs_rename-part1 2006-06-16 15:58:06.000000000 -0700
+++ lxc-dave/fs/nfsd/vfs.c 2006-06-16 15:58:06.000000000 -0700
@@ -1597,13 +1597,23 @@ nfsd_rename(struct svc_rqst *rqstp, stru
err = -EPERM;
} else
#endif
+ err = mnt_want_write(ffhp->fh_export->ex_mnt);
+ if (err)
+ goto out_dput_new;
+
+ err = mnt_want_write(tfhp->fh_export->ex_mnt);
+ if (err)
+ goto out_mnt_drop_write_old;
+
err = vfs_rename(fdir, odentry, tdir, ndentry);
if (!err && EX_ISSYNC(tfhp->fh_export)) {
err = nfsd_sync_dir(tdentry);
if (!err)
err = nfsd_sync_dir(fdentry);
}
-
+ mnt_drop_write(tfhp->fh_export->ex_mnt);
+ out_mnt_drop_write_old:
+ mnt_drop_write(ffhp->fh_export->ex_mnt);
out_dput_new:
dput(ndentry);
out_dput_old:
_
-
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