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authorAmir Goldstein <amir73il@gmail.com>2017-01-17 06:34:55 +0200
committerMiklos Szeredi <mszeredi@redhat.com>2017-02-07 15:47:14 +0100
commitd8514d8edb5b045cf7f708e14f888ce760d60f0b (patch)
tree26c59821374354ebb2dd0904de0d8f9fd4e06d2b /fs/overlayfs
parent42f269b925405d9dd45014823e5057786d6ca452 (diff)
downloadlinux-d8514d8edb5b045cf7f708e14f888ce760d60f0b.tar.bz2
ovl: copy up regular file using O_TMPFILE
In preparation for concurrent copy up, implement copy up of regular file as O_TMPFILE that is linked to upperdir instead of a file in workdir that is moved to upperdir. Suggested-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/overlayfs')
-rw-r--r--fs/overlayfs/copy_up.c27
1 files changed, 20 insertions, 7 deletions
diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c
index 01e332725e94..6e39e90b5605 100644
--- a/fs/overlayfs/copy_up.c
+++ b/fs/overlayfs/copy_up.c
@@ -20,6 +20,7 @@
#include <linux/fdtable.h>
#include <linux/ratelimit.h>
#include "overlayfs.h"
+#include "ovl_entry.h"
#define OVL_COPY_UP_CHUNK_SIZE (1 << 20)
@@ -233,7 +234,7 @@ int ovl_set_attr(struct dentry *upperdentry, struct kstat *stat)
static int ovl_copy_up_locked(struct dentry *workdir, struct dentry *upperdir,
struct dentry *dentry, struct path *lowerpath,
struct kstat *stat, const char *link,
- struct kstat *pstat)
+ struct kstat *pstat, bool tmpfile)
{
struct inode *wdir = workdir->d_inode;
struct inode *udir = upperdir->d_inode;
@@ -263,12 +264,17 @@ static int ovl_copy_up_locked(struct dentry *workdir, struct dentry *upperdir,
if (new_creds)
old_creds = override_creds(new_creds);
- temp = ovl_lookup_temp(workdir, dentry);
+ if (tmpfile)
+ temp = ovl_do_tmpfile(upperdir, stat->mode);
+ else
+ temp = ovl_lookup_temp(workdir, dentry);
err = PTR_ERR(temp);
if (IS_ERR(temp))
goto out1;
- err = ovl_create_real(wdir, temp, &cattr, NULL, true);
+ err = 0;
+ if (!tmpfile)
+ err = ovl_create_real(wdir, temp, &cattr, NULL, true);
if (new_creds) {
revert_creds(old_creds);
@@ -300,11 +306,14 @@ static int ovl_copy_up_locked(struct dentry *workdir, struct dentry *upperdir,
if (err)
goto out_cleanup;
- err = ovl_do_rename(wdir, temp, udir, upper, 0);
+ if (tmpfile)
+ err = ovl_do_link(temp, udir, upper, true);
+ else
+ err = ovl_do_rename(wdir, temp, udir, upper, 0);
if (err)
goto out_cleanup;
- newdentry = dget(temp);
+ newdentry = dget(tmpfile ? upper : temp);
ovl_dentry_update(dentry, newdentry);
ovl_inode_update(d_inode(dentry), d_inode(newdentry));
@@ -318,7 +327,8 @@ out:
return err;
out_cleanup:
- ovl_cleanup(wdir, temp);
+ if (!tmpfile)
+ ovl_cleanup(wdir, temp);
goto out2;
}
@@ -342,6 +352,9 @@ static int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry,
struct dentry *lowerdentry = lowerpath->dentry;
struct dentry *upperdir;
const char *link = NULL;
+ struct ovl_fs *ofs = dentry->d_sb->s_fs_info;
+ /* Should we copyup with O_TMPFILE or with workdir? */
+ bool tmpfile = S_ISREG(stat->mode) && ofs->tmpfile;
if (WARN_ON(!workdir))
return -EROFS;
@@ -373,7 +386,7 @@ static int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry,
}
err = ovl_copy_up_locked(workdir, upperdir, dentry, lowerpath,
- stat, link, &pstat);
+ stat, link, &pstat, tmpfile);
out_unlock:
unlock_rename(workdir, upperdir);
do_delayed_call(&done);