Merge branch 'overlayfs-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs
Pull overlayfs updates from Miklos Szeredi: "Because copy up can take a long time, serialized copy ups could be a big performance bottleneck. This update allows concurrent copy up of regular files eliminating this potential problem. There are also minor fixes" * 'overlayfs-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs: ovl: drop CAP_SYS_RESOURCE from saved mounter's credentials ovl: properly implement sync_filesystem() ovl: concurrent copy up of regular files ovl: introduce copy up waitqueue ovl: copy up regular file using O_TMPFILE ovl: rearrange code in ovl_copy_up_locked() ovl: check if upperdir fs supports O_TMPFILE
This commit is contained in:
Linus Torvalds
Коммит
e58bc92783
|
|
@ -21,6 +21,7 @@
|
|||
#include <linux/fdtable.h>
|
||||
#include <linux/ratelimit.h>
|
||||
#include "overlayfs.h"
|
||||
#include "ovl_entry.h"
|
||||
|
||||
#define OVL_COPY_UP_CHUNK_SIZE (1 << 20)
|
||||
|
||||
|
|
@ -233,12 +234,14 @@ 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 *stat, const char *link,
|
||||
struct kstat *pstat, bool tmpfile)
|
||||
{
|
||||
struct inode *wdir = workdir->d_inode;
|
||||
struct inode *udir = upperdir->d_inode;
|
||||
struct dentry *newdentry = NULL;
|
||||
struct dentry *upper = NULL;
|
||||
struct dentry *temp = NULL;
|
||||
int err;
|
||||
const struct cred *old_creds = NULL;
|
||||
struct cred *new_creds = NULL;
|
||||
|
|
@ -249,25 +252,30 @@ static int ovl_copy_up_locked(struct dentry *workdir, struct dentry *upperdir,
|
|||
.link = link
|
||||
};
|
||||
|
||||
newdentry = ovl_lookup_temp(workdir, dentry);
|
||||
err = PTR_ERR(newdentry);
|
||||
if (IS_ERR(newdentry))
|
||||
goto out;
|
||||
|
||||
upper = lookup_one_len(dentry->d_name.name, upperdir,
|
||||
dentry->d_name.len);
|
||||
err = PTR_ERR(upper);
|
||||
if (IS_ERR(upper))
|
||||
goto out1;
|
||||
goto out;
|
||||
|
||||
err = security_inode_copy_up(dentry, &new_creds);
|
||||
if (err < 0)
|
||||
goto out2;
|
||||
goto out1;
|
||||
|
||||
if (new_creds)
|
||||
old_creds = override_creds(new_creds);
|
||||
|
||||
err = ovl_create_real(wdir, newdentry, &cattr, NULL, true);
|
||||
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 = 0;
|
||||
if (!tmpfile)
|
||||
err = ovl_create_real(wdir, temp, &cattr, NULL, true);
|
||||
|
||||
if (new_creds) {
|
||||
revert_creds(old_creds);
|
||||
|
|
@ -282,39 +290,55 @@ static int ovl_copy_up_locked(struct dentry *workdir, struct dentry *upperdir,
|
|||
|
||||
ovl_path_upper(dentry, &upperpath);
|
||||
BUG_ON(upperpath.dentry != NULL);
|
||||
upperpath.dentry = newdentry;
|
||||
upperpath.dentry = temp;
|
||||
|
||||
if (tmpfile) {
|
||||
inode_unlock(udir);
|
||||
err = ovl_copy_up_data(lowerpath, &upperpath,
|
||||
stat->size);
|
||||
inode_lock_nested(udir, I_MUTEX_PARENT);
|
||||
} else {
|
||||
err = ovl_copy_up_data(lowerpath, &upperpath,
|
||||
stat->size);
|
||||
}
|
||||
|
||||
err = ovl_copy_up_data(lowerpath, &upperpath, stat->size);
|
||||
if (err)
|
||||
goto out_cleanup;
|
||||
}
|
||||
|
||||
err = ovl_copy_xattr(lowerpath->dentry, newdentry);
|
||||
err = ovl_copy_xattr(lowerpath->dentry, temp);
|
||||
if (err)
|
||||
goto out_cleanup;
|
||||
|
||||
inode_lock(newdentry->d_inode);
|
||||
err = ovl_set_attr(newdentry, stat);
|
||||
inode_unlock(newdentry->d_inode);
|
||||
inode_lock(temp->d_inode);
|
||||
err = ovl_set_attr(temp, stat);
|
||||
inode_unlock(temp->d_inode);
|
||||
if (err)
|
||||
goto out_cleanup;
|
||||
|
||||
err = ovl_do_rename(wdir, newdentry, 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(tmpfile ? upper : temp);
|
||||
ovl_dentry_update(dentry, newdentry);
|
||||
ovl_inode_update(d_inode(dentry), d_inode(newdentry));
|
||||
newdentry = NULL;
|
||||
|
||||
/* Restore timestamps on parent (best effort) */
|
||||
ovl_set_timestamps(upperdir, pstat);
|
||||
out2:
|
||||
dput(upper);
|
||||
dput(temp);
|
||||
out1:
|
||||
dput(newdentry);
|
||||
dput(upper);
|
||||
out:
|
||||
return err;
|
||||
|
||||
out_cleanup:
|
||||
ovl_cleanup(wdir, newdentry);
|
||||
if (!tmpfile)
|
||||
ovl_cleanup(wdir, temp);
|
||||
goto out2;
|
||||
}
|
||||
|
||||
|
|
@ -338,6 +362,7 @@ 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;
|
||||
|
||||
if (WARN_ON(!workdir))
|
||||
return -EROFS;
|
||||
|
|
@ -358,6 +383,25 @@ static int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry,
|
|||
return PTR_ERR(link);
|
||||
}
|
||||
|
||||
/* Should we copyup with O_TMPFILE or with workdir? */
|
||||
if (S_ISREG(stat->mode) && ofs->tmpfile) {
|
||||
err = ovl_copy_up_start(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);
|
||||
if (err > 0)
|
||||
err = 0;
|
||||
goto out_done;
|
||||
}
|
||||
|
||||
inode_lock_nested(upperdir->d_inode, I_MUTEX_PARENT);
|
||||
err = ovl_copy_up_locked(workdir, upperdir, dentry, lowerpath,
|
||||
stat, link, &pstat, true);
|
||||
inode_unlock(upperdir->d_inode);
|
||||
ovl_copy_up_end(dentry);
|
||||
goto out_done;
|
||||
}
|
||||
|
||||
err = -EIO;
|
||||
if (lock_rename(workdir, upperdir) != NULL) {
|
||||
pr_err("overlayfs: failed to lock workdir+upperdir\n");
|
||||
|
|
@ -370,13 +414,10 @@ static int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry,
|
|||
}
|
||||
|
||||
err = ovl_copy_up_locked(workdir, upperdir, dentry, lowerpath,
|
||||
stat, link);
|
||||
if (!err) {
|
||||
/* Restore timestamps on parent (best effort) */
|
||||
ovl_set_timestamps(upperdir, &pstat);
|
||||
}
|
||||
stat, link, &pstat, false);
|
||||
out_unlock:
|
||||
unlock_rename(workdir, upperdir);
|
||||
out_done:
|
||||
do_delayed_call(&done);
|
||||
|
||||
return err;
|
||||
|
|
|
|||
|
|
@ -127,6 +127,15 @@ static inline int ovl_do_whiteout(struct inode *dir, struct dentry *dentry)
|
|||
return err;
|
||||
}
|
||||
|
||||
static inline struct dentry *ovl_do_tmpfile(struct dentry *dentry, umode_t mode)
|
||||
{
|
||||
struct dentry *ret = vfs_tmpfile(dentry, mode, 0);
|
||||
int err = IS_ERR(ret) ? PTR_ERR(ret) : 0;
|
||||
|
||||
pr_debug("tmpfile(%pd2, 0%o) = %i\n", dentry, mode, err);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static inline struct inode *ovl_inode_real(struct inode *inode, bool *is_upper)
|
||||
{
|
||||
unsigned long x = (unsigned long) READ_ONCE(inode->i_private);
|
||||
|
|
@ -169,6 +178,8 @@ void ovl_dentry_version_inc(struct dentry *dentry);
|
|||
u64 ovl_dentry_version_get(struct dentry *dentry);
|
||||
bool ovl_is_whiteout(struct dentry *dentry);
|
||||
struct file *ovl_path_open(struct path *path, int flags);
|
||||
int ovl_copy_up_start(struct dentry *dentry);
|
||||
void ovl_copy_up_end(struct dentry *dentry);
|
||||
|
||||
/* namei.c */
|
||||
int ovl_path_next(int idx, struct dentry *dentry, struct path *path);
|
||||
|
|
|
|||
|
|
@ -27,6 +27,8 @@ struct ovl_fs {
|
|||
struct ovl_config config;
|
||||
/* creds of process who forced instantiation of super block */
|
||||
const struct cred *creator_cred;
|
||||
bool tmpfile;
|
||||
wait_queue_head_t copyup_wq;
|
||||
};
|
||||
|
||||
/* private information held for every overlayfs dentry */
|
||||
|
|
@ -38,6 +40,7 @@ struct ovl_entry {
|
|||
u64 version;
|
||||
const char *redirect;
|
||||
bool opaque;
|
||||
bool copying;
|
||||
};
|
||||
struct rcu_head rcu;
|
||||
};
|
||||
|
|
|
|||
|
|
@ -161,6 +161,25 @@ static void ovl_put_super(struct super_block *sb)
|
|||
kfree(ufs);
|
||||
}
|
||||
|
||||
static int ovl_sync_fs(struct super_block *sb, int wait)
|
||||
{
|
||||
struct ovl_fs *ufs = sb->s_fs_info;
|
||||
struct super_block *upper_sb;
|
||||
int ret;
|
||||
|
||||
if (!ufs->upper_mnt)
|
||||
return 0;
|
||||
upper_sb = ufs->upper_mnt->mnt_sb;
|
||||
if (!upper_sb->s_op->sync_fs)
|
||||
return 0;
|
||||
|
||||
/* real inodes have already been synced by sync_filesystem(ovl_sb) */
|
||||
down_read(&upper_sb->s_umount);
|
||||
ret = upper_sb->s_op->sync_fs(upper_sb, wait);
|
||||
up_read(&upper_sb->s_umount);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* ovl_statfs
|
||||
* @sb: The overlayfs super block
|
||||
|
|
@ -223,6 +242,7 @@ static int ovl_remount(struct super_block *sb, int *flags, char *data)
|
|||
|
||||
static const struct super_operations ovl_super_operations = {
|
||||
.put_super = ovl_put_super,
|
||||
.sync_fs = ovl_sync_fs,
|
||||
.statfs = ovl_statfs,
|
||||
.show_options = ovl_show_options,
|
||||
.remount_fs = ovl_remount,
|
||||
|
|
@ -702,6 +722,7 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
|
|||
unsigned int stacklen = 0;
|
||||
unsigned int i;
|
||||
bool remote = false;
|
||||
struct cred *cred;
|
||||
int err;
|
||||
|
||||
err = -ENOMEM;
|
||||
|
|
@ -709,6 +730,7 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
|
|||
if (!ufs)
|
||||
goto out;
|
||||
|
||||
init_waitqueue_head(&ufs->copyup_wq);
|
||||
ufs->config.redirect_dir = ovl_redirect_dir_def;
|
||||
err = ovl_parse_opt((char *) data, &ufs->config);
|
||||
if (err)
|
||||
|
|
@ -826,6 +848,8 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
|
|||
* creation of workdir in previous step.
|
||||
*/
|
||||
if (ufs->workdir) {
|
||||
struct dentry *temp;
|
||||
|
||||
err = ovl_check_d_type_supported(&workpath);
|
||||
if (err < 0)
|
||||
goto out_put_workdir;
|
||||
|
|
@ -837,6 +861,14 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
|
|||
*/
|
||||
if (!err)
|
||||
pr_warn("overlayfs: upper fs needs to support d_type.\n");
|
||||
|
||||
/* Check if upper/work fs supports O_TMPFILE */
|
||||
temp = ovl_do_tmpfile(ufs->workdir, S_IFREG | 0);
|
||||
ufs->tmpfile = !IS_ERR(temp);
|
||||
if (ufs->tmpfile)
|
||||
dput(temp);
|
||||
else
|
||||
pr_warn("overlayfs: upper fs does not support tmpfile.\n");
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -871,10 +903,13 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
|
|||
else
|
||||
sb->s_d_op = &ovl_dentry_operations;
|
||||
|
||||
ufs->creator_cred = prepare_creds();
|
||||
if (!ufs->creator_cred)
|
||||
ufs->creator_cred = cred = prepare_creds();
|
||||
if (!cred)
|
||||
goto out_put_lower_mnt;
|
||||
|
||||
/* Never override disk quota limits or use reserved space */
|
||||
cap_lower(cred->cap_effective, CAP_SYS_RESOURCE);
|
||||
|
||||
err = -ENOMEM;
|
||||
oe = ovl_alloc_entry(numlower);
|
||||
if (!oe)
|
||||
|
|
|
|||
|
|
@ -12,6 +12,7 @@
|
|||
#include <linux/slab.h>
|
||||
#include <linux/cred.h>
|
||||
#include <linux/xattr.h>
|
||||
#include <linux/sched/signal.h>
|
||||
#include "overlayfs.h"
|
||||
#include "ovl_entry.h"
|
||||
|
||||
|
|
@ -264,3 +265,33 @@ struct file *ovl_path_open(struct path *path, int flags)
|
|||
{
|
||||
return dentry_open(path, flags | O_NOATIME, current_cred());
|
||||
}
|
||||
|
||||
int ovl_copy_up_start(struct dentry *dentry)
|
||||
{
|
||||
struct ovl_fs *ofs = dentry->d_sb->s_fs_info;
|
||||
struct ovl_entry *oe = dentry->d_fsdata;
|
||||
int err;
|
||||
|
||||
spin_lock(&ofs->copyup_wq.lock);
|
||||
err = wait_event_interruptible_locked(ofs->copyup_wq, !oe->copying);
|
||||
if (!err) {
|
||||
if (oe->__upperdentry)
|
||||
err = 1; /* Already copied up */
|
||||
else
|
||||
oe->copying = true;
|
||||
}
|
||||
spin_unlock(&ofs->copyup_wq.lock);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
void ovl_copy_up_end(struct dentry *dentry)
|
||||
{
|
||||
struct ovl_fs *ofs = dentry->d_sb->s_fs_info;
|
||||
struct ovl_entry *oe = dentry->d_fsdata;
|
||||
|
||||
spin_lock(&ofs->copyup_wq.lock);
|
||||
oe->copying = false;
|
||||
wake_up_locked(&ofs->copyup_wq);
|
||||
spin_unlock(&ofs->copyup_wq.lock);
|
||||
}
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче