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ovl: use struct copy_up_ctx as function argument

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This cleans up functions with too many arguments.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi 2017-07-04 22:03:18 +02:00
parent 7ab8b1763f
commit 23f0ab13ea
1 changed files with 78 additions and 82 deletions
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160
fs/overlayfs/copy_up.c
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@ -316,38 +316,45 @@ static int ovl_set_origin(struct dentry *dentry, struct dentry *lower,
return err; return err;
} }
static int ovl_install_temp(struct dentry *workdir, struct dentry *upperdir, struct ovl_copy_up_ctx {
struct dentry *dentry, struct dentry *dentry;
struct dentry *temp, struct kstat *pstat, struct path lowerpath;
bool tmpfile, struct dentry **newdentry) 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; int err;
struct dentry *upper; 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, upper = lookup_one_len(c->dentry->d_name.name, c->upperdir,
dentry->d_name.len); c->dentry->d_name.len);
if (IS_ERR(upper)) if (IS_ERR(upper))
return PTR_ERR(upper); return PTR_ERR(upper);
if (tmpfile) if (c->tmpfile)
err = ovl_do_link(temp, udir, upper, true); err = ovl_do_link(temp, udir, upper, true);
else 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) */ /* Restore timestamps on parent (best effort) */
if (!err) { if (!err) {
ovl_set_timestamps(upperdir, pstat); ovl_set_timestamps(c->upperdir, &c->pstat);
*newdentry = dget(tmpfile ? upper : temp); *newdentry = dget(c->tmpfile ? upper : temp);
} }
dput(upper); dput(upper);
return err; return err;
} }
static int ovl_get_tmpfile(struct dentry *workdir, struct dentry *dentry, static int ovl_get_tmpfile(struct ovl_copy_up_ctx *c, struct dentry **tempp)
struct kstat *stat, const char *link, bool tmpfile,
struct dentry **tempp)
{ {
int err; int err;
struct dentry *temp; struct dentry *temp;
@ -355,28 +362,28 @@ static int ovl_get_tmpfile(struct dentry *workdir, struct dentry *dentry,
struct cred *new_creds = NULL; struct cred *new_creds = NULL;
struct cattr cattr = { struct cattr cattr = {
/* Can't properly set mode on creation because of the umask */ /* Can't properly set mode on creation because of the umask */
.mode = stat->mode & S_IFMT, .mode = c->stat.mode & S_IFMT,
.rdev = stat->rdev, .rdev = c->stat.rdev,
.link = link .link = c->link
}; };
err = security_inode_copy_up(dentry, &new_creds); err = security_inode_copy_up(c->dentry, &new_creds);
if (err < 0) if (err < 0)
goto out; goto out;
if (new_creds) if (new_creds)
old_creds = override_creds(new_creds); old_creds = override_creds(new_creds);
if (tmpfile) { if (c->tmpfile) {
temp = ovl_do_tmpfile(workdir, stat->mode); temp = ovl_do_tmpfile(c->workdir, c->stat.mode);
if (IS_ERR(temp)) if (IS_ERR(temp))
goto temp_err; goto temp_err;
} else { } else {
temp = ovl_lookup_temp(workdir); temp = ovl_lookup_temp(c->workdir);
if (IS_ERR(temp)) if (IS_ERR(temp))
goto temp_err; goto temp_err;
err = ovl_create_real(d_inode(workdir), temp, &cattr, err = ovl_create_real(d_inode(c->workdir), temp, &cattr,
NULL, true); NULL, true);
if (err) { if (err) {
dput(temp); dput(temp);
@ -398,29 +405,28 @@ temp_err:
goto out; goto out;
} }
static int ovl_copy_up_inode(struct dentry *dentry, struct dentry *temp, static int ovl_copy_up_inode(struct ovl_copy_up_ctx *c, struct dentry *temp)
struct path *lowerpath, struct kstat *stat)
{ {
int err; int err;
if (S_ISREG(stat->mode)) { if (S_ISREG(c->stat.mode)) {
struct path upperpath; struct path upperpath;
ovl_path_upper(dentry, &upperpath); ovl_path_upper(c->dentry, &upperpath);
BUG_ON(upperpath.dentry != NULL); BUG_ON(upperpath.dentry != NULL);
upperpath.dentry = temp; 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) if (err)
return err; return err;
} }
err = ovl_copy_xattr(lowerpath->dentry, temp); err = ovl_copy_xattr(c->lowerpath.dentry, temp);
if (err) if (err)
return err; return err;
inode_lock(temp->d_inode); inode_lock(temp->d_inode);
err = ovl_set_attr(temp, stat); err = ovl_set_attr(temp, &c->stat);
inode_unlock(temp->d_inode); inode_unlock(temp->d_inode);
if (err) if (err)
return 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 * Don't set origin when we are breaking the association with a lower
* hard link. * hard link.
*/ */
if (S_ISDIR(stat->mode) || stat->nlink == 1) { if (S_ISDIR(c->stat.mode) || c->stat.nlink == 1) {
err = ovl_set_origin(dentry, lowerpath->dentry, temp); err = ovl_set_origin(c->dentry, c->lowerpath.dentry, temp);
if (err) if (err)
return err; return err;
} }
@ -441,45 +447,39 @@ static int ovl_copy_up_inode(struct dentry *dentry, struct dentry *temp,
return 0; return 0;
} }
static int ovl_copy_up_locked(struct dentry *workdir, struct dentry *upperdir, static int ovl_copy_up_locked(struct ovl_copy_up_ctx *c)
struct dentry *dentry, struct path *lowerpath,
struct kstat *stat, const char *link,
struct kstat *pstat, bool tmpfile)
{ {
struct inode *wdir = workdir->d_inode; struct inode *udir = c->upperdir->d_inode;
struct inode *udir = upperdir->d_inode;
struct dentry *newdentry = NULL; struct dentry *newdentry = NULL;
struct dentry *temp = NULL; struct dentry *temp = NULL;
int err; int err;
err = ovl_get_tmpfile(workdir, dentry, stat, link, tmpfile, &temp); err = ovl_get_tmpfile(c, &temp);
if (err) if (err)
goto out; goto out;
err = ovl_copy_up_inode(dentry, temp, lowerpath, stat); err = ovl_copy_up_inode(c, temp);
if (err) if (err)
goto out_cleanup; goto out_cleanup;
if (tmpfile) { if (c->tmpfile) {
inode_lock_nested(udir, I_MUTEX_PARENT); inode_lock_nested(udir, I_MUTEX_PARENT);
err = ovl_install_temp(workdir, upperdir, dentry, temp, pstat, err = ovl_install_temp(c, temp, &newdentry);
tmpfile, &newdentry);
inode_unlock(udir); inode_unlock(udir);
} else { } else {
err = ovl_install_temp(workdir, upperdir, dentry, temp, pstat, err = ovl_install_temp(c, temp, &newdentry);
tmpfile, &newdentry);
} }
if (err) if (err)
goto out_cleanup; goto out_cleanup;
ovl_inode_update(d_inode(dentry), newdentry); ovl_inode_update(d_inode(c->dentry), newdentry);
out: out:
dput(temp); dput(temp);
return err; return err;
out_cleanup: out_cleanup:
if (!tmpfile) if (!c->tmpfile)
ovl_cleanup(wdir, temp); ovl_cleanup(d_inode(c->workdir), temp);
goto out; goto out;
} }
@ -492,75 +492,70 @@ out_cleanup:
* is possible that the copy up will lock the old parent. At that point * is possible that the copy up will lock the old parent. At that point
* the file will have already been copied up anyway. * the file will have already been copied up anyway.
*/ */
static int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry, static int ovl_copy_up_one(struct dentry *parent, struct ovl_copy_up_ctx *c)
struct path *lowerpath, struct kstat *stat)
{ {
DEFINE_DELAYED_CALL(done); DEFINE_DELAYED_CALL(done);
struct dentry *workdir = ovl_workdir(dentry);
int err; int err;
struct kstat pstat;
struct path parentpath; struct path parentpath;
struct dentry *lowerdentry = lowerpath->dentry; struct dentry *lowerdentry = c->lowerpath.dentry;
struct dentry *upperdir; struct ovl_fs *ofs = c->dentry->d_sb->s_fs_info;
const char *link = NULL;
struct ovl_fs *ofs = dentry->d_sb->s_fs_info;
if (WARN_ON(!workdir)) c->workdir = ovl_workdir(c->dentry);
if (WARN_ON(!c->workdir))
return -EROFS; return -EROFS;
ovl_do_check_copy_up(lowerdentry); ovl_do_check_copy_up(lowerdentry);
ovl_path_upper(parent, &parentpath); ovl_path_upper(parent, &parentpath);
upperdir = parentpath.dentry; c->upperdir = parentpath.dentry;
/* Mark parent "impure" because it may now contain non-pure upper */ /* 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) if (err)
return err; return err;
err = vfs_getattr(&parentpath, &pstat, err = vfs_getattr(&parentpath, &c->pstat,
STATX_ATIME | STATX_MTIME, AT_STATX_SYNC_AS_STAT); STATX_ATIME | STATX_MTIME, AT_STATX_SYNC_AS_STAT);
if (err) if (err)
return err; return err;
if (S_ISLNK(stat->mode)) { if (S_ISLNK(c->stat.mode)) {
link = vfs_get_link(lowerdentry, &done); c->link = vfs_get_link(lowerdentry, &done);
if (IS_ERR(link)) if (IS_ERR(c->link))
return PTR_ERR(link); return PTR_ERR(c->link);
} }
/* Should we copyup with O_TMPFILE or with workdir? */ /* Should we copyup with O_TMPFILE or with workdir? */
if (S_ISREG(stat->mode) && ofs->tmpfile) { if (S_ISREG(c->stat.mode) && ofs->tmpfile) {
err = ovl_copy_up_start(dentry); err = ovl_copy_up_start(c->dentry);
/* err < 0: interrupted, err > 0: raced with another copy-up */ /* err < 0: interrupted, err > 0: raced with another copy-up */
if (unlikely(err)) { 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) if (err > 0)
err = 0; err = 0;
goto out_done; goto out_done;
} }
c->tmpfile = true;
err = ovl_copy_up_locked(workdir, upperdir, dentry, lowerpath, err = ovl_copy_up_locked(c);
stat, link, &pstat, true); ovl_copy_up_end(c->dentry);
ovl_copy_up_end(dentry);
goto out_done; goto out_done;
} }
err = -EIO; 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"); pr_err("overlayfs: failed to lock workdir+upperdir\n");
goto out_unlock; goto out_unlock;
} }
if (ovl_dentry_upper(dentry)) { if (ovl_dentry_upper(c->dentry)) {
/* Raced with another copy-up? Nothing to do, then... */ /* Raced with another copy-up? Nothing to do, then... */
err = 0; err = 0;
goto out_unlock; goto out_unlock;
} }
err = ovl_copy_up_locked(workdir, upperdir, dentry, lowerpath, err = ovl_copy_up_locked(c);
stat, link, &pstat, false);
out_unlock: out_unlock:
unlock_rename(workdir, upperdir); unlock_rename(c->workdir, c->upperdir);
out_done: out_done:
do_delayed_call(&done); do_delayed_call(&done);
@ -575,8 +570,7 @@ int ovl_copy_up_flags(struct dentry *dentry, int flags)
while (!err) { while (!err) {
struct dentry *next; struct dentry *next;
struct dentry *parent; struct dentry *parent;
struct path lowerpath; struct ovl_copy_up_ctx ctx = { };
struct kstat stat;
enum ovl_path_type type = ovl_path_type(dentry); enum ovl_path_type type = ovl_path_type(dentry);
if (OVL_TYPE_UPPER(type)) if (OVL_TYPE_UPPER(type))
@ -595,14 +589,16 @@ int ovl_copy_up_flags(struct dentry *dentry, int flags)
next = parent; next = parent;
} }
ovl_path_lower(next, &lowerpath); ovl_path_lower(next, &ctx.lowerpath);
err = vfs_getattr(&lowerpath, &stat, err = vfs_getattr(&ctx.lowerpath, &ctx.stat,
STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT); STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
/* maybe truncate regular file. this has no effect on dirs */ /* maybe truncate regular file. this has no effect on dirs */
if (flags & O_TRUNC) if (flags & O_TRUNC)
stat.size = 0; ctx.stat.size = 0;
if (!err) if (!err) {
err = ovl_copy_up_one(parent, next, &lowerpath, &stat); ctx.dentry = next;
err = ovl_copy_up_one(parent, &ctx);
}
dput(parent); dput(parent);
dput(next); dput(next);