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-rw-r--r--fs/overlayfs/copy_up.c160
1 files changed, 78 insertions, 82 deletions
diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c
index 1264f2434047..8f9e26e91386 100644
--- a/fs/overlayfs/copy_up.c
+++ b/fs/overlayfs/copy_up.c
@@ -316,38 +316,45 @@ static int ovl_set_origin(struct dentry *dentry, struct dentry *lower,
return err;
}
-static int ovl_install_temp(struct dentry *workdir, struct dentry *upperdir,
- struct dentry *dentry,
- struct dentry *temp, struct kstat *pstat,
- bool tmpfile, struct dentry **newdentry)
+struct ovl_copy_up_ctx {
+ struct dentry *dentry;
+ struct path lowerpath;
+ struct kstat stat;
+ struct kstat pstat;
+ const char *link;
+ struct dentry *upperdir;
+ struct dentry *workdir;
+ bool tmpfile;
+};
+
+static int ovl_install_temp(struct ovl_copy_up_ctx *c, struct dentry *temp,
+ struct dentry **newdentry)
{
int err;
struct dentry *upper;
- struct inode *udir = d_inode(upperdir);
+ struct inode *udir = d_inode(c->upperdir);
- upper = lookup_one_len(dentry->d_name.name, upperdir,
- dentry->d_name.len);
+ upper = lookup_one_len(c->dentry->d_name.name, c->upperdir,
+ c->dentry->d_name.len);
if (IS_ERR(upper))
return PTR_ERR(upper);
- if (tmpfile)
+ if (c->tmpfile)
err = ovl_do_link(temp, udir, upper, true);
else
- err = ovl_do_rename(d_inode(workdir), temp, udir, upper, 0);
+ err = ovl_do_rename(d_inode(c->workdir), temp, udir, upper, 0);
/* Restore timestamps on parent (best effort) */
if (!err) {
- ovl_set_timestamps(upperdir, pstat);
- *newdentry = dget(tmpfile ? upper : temp);
+ ovl_set_timestamps(c->upperdir, &c->pstat);
+ *newdentry = dget(c->tmpfile ? upper : temp);
}
dput(upper);
return err;
}
-static int ovl_get_tmpfile(struct dentry *workdir, struct dentry *dentry,
- struct kstat *stat, const char *link, bool tmpfile,
- struct dentry **tempp)
+static int ovl_get_tmpfile(struct ovl_copy_up_ctx *c, struct dentry **tempp)
{
int err;
struct dentry *temp;
@@ -355,28 +362,28 @@ static int ovl_get_tmpfile(struct dentry *workdir, struct dentry *dentry,
struct cred *new_creds = NULL;
struct cattr cattr = {
/* Can't properly set mode on creation because of the umask */
- .mode = stat->mode & S_IFMT,
- .rdev = stat->rdev,
- .link = link
+ .mode = c->stat.mode & S_IFMT,
+ .rdev = c->stat.rdev,
+ .link = c->link
};
- err = security_inode_copy_up(dentry, &new_creds);
+ err = security_inode_copy_up(c->dentry, &new_creds);
if (err < 0)
goto out;
if (new_creds)
old_creds = override_creds(new_creds);
- if (tmpfile) {
- temp = ovl_do_tmpfile(workdir, stat->mode);
+ if (c->tmpfile) {
+ temp = ovl_do_tmpfile(c->workdir, c->stat.mode);
if (IS_ERR(temp))
goto temp_err;
} else {
- temp = ovl_lookup_temp(workdir);
+ temp = ovl_lookup_temp(c->workdir);
if (IS_ERR(temp))
goto temp_err;
- err = ovl_create_real(d_inode(workdir), temp, &cattr,
+ err = ovl_create_real(d_inode(c->workdir), temp, &cattr,
NULL, true);
if (err) {
dput(temp);
@@ -398,29 +405,28 @@ temp_err:
goto out;
}
-static int ovl_copy_up_inode(struct dentry *dentry, struct dentry *temp,
- struct path *lowerpath, struct kstat *stat)
+static int ovl_copy_up_inode(struct ovl_copy_up_ctx *c, struct dentry *temp)
{
int err;
- if (S_ISREG(stat->mode)) {
+ if (S_ISREG(c->stat.mode)) {
struct path upperpath;
- ovl_path_upper(dentry, &upperpath);
+ ovl_path_upper(c->dentry, &upperpath);
BUG_ON(upperpath.dentry != NULL);
upperpath.dentry = temp;
- err = ovl_copy_up_data(lowerpath, &upperpath, stat->size);
+ err = ovl_copy_up_data(&c->lowerpath, &upperpath, c->stat.size);
if (err)
return err;
}
- err = ovl_copy_xattr(lowerpath->dentry, temp);
+ err = ovl_copy_xattr(c->lowerpath.dentry, temp);
if (err)
return err;
inode_lock(temp->d_inode);
- err = ovl_set_attr(temp, stat);
+ err = ovl_set_attr(temp, &c->stat);
inode_unlock(temp->d_inode);
if (err)
return err;
@@ -432,8 +438,8 @@ static int ovl_copy_up_inode(struct dentry *dentry, struct dentry *temp,
* Don't set origin when we are breaking the association with a lower
* hard link.
*/
- if (S_ISDIR(stat->mode) || stat->nlink == 1) {
- err = ovl_set_origin(dentry, lowerpath->dentry, temp);
+ if (S_ISDIR(c->stat.mode) || c->stat.nlink == 1) {
+ err = ovl_set_origin(c->dentry, c->lowerpath.dentry, temp);
if (err)
return err;
}
@@ -441,45 +447,39 @@ static int ovl_copy_up_inode(struct dentry *dentry, struct dentry *temp,
return 0;
}
-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, bool tmpfile)
+static int ovl_copy_up_locked(struct ovl_copy_up_ctx *c)
{
- struct inode *wdir = workdir->d_inode;
- struct inode *udir = upperdir->d_inode;
+ struct inode *udir = c->upperdir->d_inode;
struct dentry *newdentry = NULL;
struct dentry *temp = NULL;
int err;
- err = ovl_get_tmpfile(workdir, dentry, stat, link, tmpfile, &temp);
+ err = ovl_get_tmpfile(c, &temp);
if (err)
goto out;
- err = ovl_copy_up_inode(dentry, temp, lowerpath, stat);
+ err = ovl_copy_up_inode(c, temp);
if (err)
goto out_cleanup;
- if (tmpfile) {
+ if (c->tmpfile) {
inode_lock_nested(udir, I_MUTEX_PARENT);
- err = ovl_install_temp(workdir, upperdir, dentry, temp, pstat,
- tmpfile, &newdentry);
+ err = ovl_install_temp(c, temp, &newdentry);
inode_unlock(udir);
} else {
- err = ovl_install_temp(workdir, upperdir, dentry, temp, pstat,
- tmpfile, &newdentry);
+ err = ovl_install_temp(c, temp, &newdentry);
}
if (err)
goto out_cleanup;
- ovl_inode_update(d_inode(dentry), newdentry);
+ ovl_inode_update(d_inode(c->dentry), newdentry);
out:
dput(temp);
return err;
out_cleanup:
- if (!tmpfile)
- ovl_cleanup(wdir, temp);
+ if (!c->tmpfile)
+ ovl_cleanup(d_inode(c->workdir), temp);
goto out;
}
@@ -492,75 +492,70 @@ out_cleanup:
* is possible that the copy up will lock the old parent. At that point
* the file will have already been copied up anyway.
*/
-static int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry,
- struct path *lowerpath, struct kstat *stat)
+static int ovl_copy_up_one(struct dentry *parent, struct ovl_copy_up_ctx *c)
{
DEFINE_DELAYED_CALL(done);
- struct dentry *workdir = ovl_workdir(dentry);
int err;
- struct kstat pstat;
struct path parentpath;
- struct dentry *lowerdentry = lowerpath->dentry;
- struct dentry *upperdir;
- const char *link = NULL;
- struct ovl_fs *ofs = dentry->d_sb->s_fs_info;
+ struct dentry *lowerdentry = c->lowerpath.dentry;
+ struct ovl_fs *ofs = c->dentry->d_sb->s_fs_info;
- if (WARN_ON(!workdir))
+ c->workdir = ovl_workdir(c->dentry);
+ if (WARN_ON(!c->workdir))
return -EROFS;
ovl_do_check_copy_up(lowerdentry);
ovl_path_upper(parent, &parentpath);
- upperdir = parentpath.dentry;
+ c->upperdir = parentpath.dentry;
/* Mark parent "impure" because it may now contain non-pure upper */
- err = ovl_set_impure(parent, upperdir);
+ err = ovl_set_impure(parent, c->upperdir);
if (err)
return err;
- err = vfs_getattr(&parentpath, &pstat,
+ err = vfs_getattr(&parentpath, &c->pstat,
STATX_ATIME | STATX_MTIME, AT_STATX_SYNC_AS_STAT);
if (err)
return err;
- if (S_ISLNK(stat->mode)) {
- link = vfs_get_link(lowerdentry, &done);
- if (IS_ERR(link))
- return PTR_ERR(link);
+ if (S_ISLNK(c->stat.mode)) {
+ c->link = vfs_get_link(lowerdentry, &done);
+ if (IS_ERR(c->link))
+ return PTR_ERR(c->link);
}
/* Should we copyup with O_TMPFILE or with workdir? */
- if (S_ISREG(stat->mode) && ofs->tmpfile) {
- err = ovl_copy_up_start(dentry);
+ if (S_ISREG(c->stat.mode) && ofs->tmpfile) {
+ err = ovl_copy_up_start(c->dentry);
/* err < 0: interrupted, err > 0: raced with another copy-up */
if (unlikely(err)) {
- pr_debug("ovl_copy_up_start(%pd2) = %i\n", dentry, err);
+ pr_debug("ovl_copy_up_start(%pd2) = %i\n", c->dentry,
+ err);
if (err > 0)
err = 0;
goto out_done;
}
-
- err = ovl_copy_up_locked(workdir, upperdir, dentry, lowerpath,
- stat, link, &pstat, true);
- ovl_copy_up_end(dentry);
+ c->tmpfile = true;
+ err = ovl_copy_up_locked(c);
+ ovl_copy_up_end(c->dentry);
goto out_done;
}
err = -EIO;
- if (lock_rename(workdir, upperdir) != NULL) {
+ if (lock_rename(c->workdir, c->upperdir) != NULL) {
pr_err("overlayfs: failed to lock workdir+upperdir\n");
goto out_unlock;
}
- if (ovl_dentry_upper(dentry)) {
+ if (ovl_dentry_upper(c->dentry)) {
/* Raced with another copy-up? Nothing to do, then... */
err = 0;
goto out_unlock;
}
- err = ovl_copy_up_locked(workdir, upperdir, dentry, lowerpath,
- stat, link, &pstat, false);
+ err = ovl_copy_up_locked(c);
out_unlock:
- unlock_rename(workdir, upperdir);
+ unlock_rename(c->workdir, c->upperdir);
out_done:
do_delayed_call(&done);
@@ -575,8 +570,7 @@ int ovl_copy_up_flags(struct dentry *dentry, int flags)
while (!err) {
struct dentry *next;
struct dentry *parent;
- struct path lowerpath;
- struct kstat stat;
+ struct ovl_copy_up_ctx ctx = { };
enum ovl_path_type type = ovl_path_type(dentry);
if (OVL_TYPE_UPPER(type))
@@ -595,14 +589,16 @@ int ovl_copy_up_flags(struct dentry *dentry, int flags)
next = parent;
}
- ovl_path_lower(next, &lowerpath);
- err = vfs_getattr(&lowerpath, &stat,
+ ovl_path_lower(next, &ctx.lowerpath);
+ err = vfs_getattr(&ctx.lowerpath, &ctx.stat,
STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
/* maybe truncate regular file. this has no effect on dirs */
if (flags & O_TRUNC)
- stat.size = 0;
- if (!err)
- err = ovl_copy_up_one(parent, next, &lowerpath, &stat);
+ ctx.stat.size = 0;
+ if (!err) {
+ ctx.dentry = next;
+ err = ovl_copy_up_one(parent, &ctx);
+ }
dput(parent);
dput(next);