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Diffstat (limited to 'fs/overlayfs/inode.c')
-rw-r--r--fs/overlayfs/inode.c73
1 files changed, 40 insertions, 33 deletions
diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c
index 541cf3717fc2..a63e57447be9 100644
--- a/fs/overlayfs/inode.c
+++ b/fs/overlayfs/inode.c
@@ -97,8 +97,9 @@ out:
static void ovl_map_dev_ino(struct dentry *dentry, struct kstat *stat, int fsid)
{
- bool samefs = ovl_same_fs(dentry->d_sb);
- unsigned int xinobits = ovl_xino_bits(dentry->d_sb);
+ struct ovl_fs *ofs = OVL_FS(dentry->d_sb);
+ bool samefs = ovl_same_fs(ofs);
+ unsigned int xinobits = ovl_xino_bits(ofs);
unsigned int xinoshift = 64 - xinobits;
if (samefs) {
@@ -123,7 +124,7 @@ static void ovl_map_dev_ino(struct dentry *dentry, struct kstat *stat, int fsid)
stat->ino |= ((u64)fsid) << (xinoshift + 1);
stat->dev = dentry->d_sb->s_dev;
return;
- } else if (ovl_xino_warn(dentry->d_sb)) {
+ } else if (ovl_xino_warn(ofs)) {
pr_warn_ratelimited("inode number too big (%pd2, ino=%llu, xinobits=%d)\n",
dentry, stat->ino, xinobits);
}
@@ -149,7 +150,7 @@ static void ovl_map_dev_ino(struct dentry *dentry, struct kstat *stat, int fsid)
* is unique per underlying fs, so we use the unique anonymous
* bdev assigned to the underlying fs.
*/
- stat->dev = OVL_FS(dentry->d_sb)->fs[fsid].pseudo_dev;
+ stat->dev = ofs->fs[fsid].pseudo_dev;
}
}
@@ -186,7 +187,7 @@ int ovl_getattr(struct mnt_idmap *idmap, const struct path *path,
* If lower filesystem supports NFS file handles, this also guaranties
* persistent st_ino across mount cycle.
*/
- if (!is_dir || ovl_same_dev(dentry->d_sb)) {
+ if (!is_dir || ovl_same_dev(OVL_FS(dentry->d_sb))) {
if (!OVL_TYPE_UPPER(type)) {
fsid = ovl_layer_lower(dentry)->fsid;
} else if (OVL_TYPE_ORIGIN(type)) {
@@ -240,15 +241,22 @@ int ovl_getattr(struct mnt_idmap *idmap, const struct path *path,
/*
* If lower is not same as lowerdata or if there was
* no origin on upper, we can end up here.
+ * With lazy lowerdata lookup, guess lowerdata blocks
+ * from size to avoid lowerdata lookup on stat(2).
*/
struct kstat lowerdatastat;
u32 lowermask = STATX_BLOCKS;
ovl_path_lowerdata(dentry, &realpath);
- err = vfs_getattr(&realpath, &lowerdatastat,
- lowermask, flags);
- if (err)
- goto out;
+ if (realpath.dentry) {
+ err = vfs_getattr(&realpath, &lowerdatastat,
+ lowermask, flags);
+ if (err)
+ goto out;
+ } else {
+ lowerdatastat.blocks =
+ round_up(stat->size, stat->blksize) >> 9;
+ }
stat->blocks = lowerdatastat.blocks;
}
}
@@ -288,8 +296,8 @@ int ovl_permission(struct mnt_idmap *idmap,
int err;
/* Careful in RCU walk mode */
- ovl_i_path_real(inode, &realpath);
- if (!realpath.dentry) {
+ realinode = ovl_i_path_real(inode, &realpath);
+ if (!realinode) {
WARN_ON(!(mask & MAY_NOT_BLOCK));
return -ECHILD;
}
@@ -302,7 +310,6 @@ int ovl_permission(struct mnt_idmap *idmap,
if (err)
return err;
- realinode = d_inode(realpath.dentry);
old_cred = ovl_override_creds(inode->i_sb);
if (!upperinode &&
!special_file(realinode->i_mode) && mask & MAY_WRITE) {
@@ -559,20 +566,20 @@ struct posix_acl *do_ovl_get_acl(struct mnt_idmap *idmap,
struct inode *inode, int type,
bool rcu, bool noperm)
{
- struct inode *realinode = ovl_inode_real(inode);
+ struct inode *realinode;
struct posix_acl *acl;
struct path realpath;
- if (!IS_POSIXACL(realinode))
- return NULL;
-
/* Careful in RCU walk mode */
- ovl_i_path_real(inode, &realpath);
- if (!realpath.dentry) {
+ realinode = ovl_i_path_real(inode, &realpath);
+ if (!realinode) {
WARN_ON(!rcu);
return ERR_PTR(-ECHILD);
}
+ if (!IS_POSIXACL(realinode))
+ return NULL;
+
if (rcu) {
/*
* If the layer is idmapped drop out of RCU path walk
@@ -710,6 +717,9 @@ static int ovl_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
struct inode *realinode = ovl_inode_realdata(inode);
const struct cred *old_cred;
+ if (!realinode)
+ return -EIO;
+
if (!realinode->i_op->fiemap)
return -EOPNOTSUPP;
@@ -952,7 +962,7 @@ static inline void ovl_lockdep_annotate_inode_mutex_key(struct inode *inode)
static void ovl_next_ino(struct inode *inode)
{
- struct ovl_fs *ofs = inode->i_sb->s_fs_info;
+ struct ovl_fs *ofs = OVL_FS(inode->i_sb);
inode->i_ino = atomic_long_inc_return(&ofs->last_ino);
if (unlikely(!inode->i_ino))
@@ -961,7 +971,8 @@ static void ovl_next_ino(struct inode *inode)
static void ovl_map_ino(struct inode *inode, unsigned long ino, int fsid)
{
- int xinobits = ovl_xino_bits(inode->i_sb);
+ struct ovl_fs *ofs = OVL_FS(inode->i_sb);
+ int xinobits = ovl_xino_bits(ofs);
unsigned int xinoshift = 64 - xinobits;
/*
@@ -972,7 +983,7 @@ static void ovl_map_ino(struct inode *inode, unsigned long ino, int fsid)
* with d_ino also causes nfsd readdirplus to fail.
*/
inode->i_ino = ino;
- if (ovl_same_fs(inode->i_sb)) {
+ if (ovl_same_fs(ofs)) {
return;
} else if (xinobits && likely(!(ino >> xinoshift))) {
inode->i_ino |= (unsigned long)fsid << (xinoshift + 1);
@@ -1003,14 +1014,10 @@ void ovl_inode_init(struct inode *inode, struct ovl_inode_params *oip,
struct inode *realinode;
struct ovl_inode *oi = OVL_I(inode);
- if (oip->upperdentry)
- oi->__upperdentry = oip->upperdentry;
- if (oip->lowerpath && oip->lowerpath->dentry) {
- oi->lowerpath.dentry = dget(oip->lowerpath->dentry);
- oi->lowerpath.layer = oip->lowerpath->layer;
- }
- if (oip->lowerdata)
- oi->lowerdata = igrab(d_inode(oip->lowerdata));
+ oi->__upperdentry = oip->upperdentry;
+ oi->oe = oip->oe;
+ oi->redirect = oip->redirect;
+ oi->lowerdata_redirect = oip->lowerdata_redirect;
realinode = ovl_inode_real(inode);
ovl_copyattr(inode);
@@ -1325,7 +1332,7 @@ struct inode *ovl_get_inode(struct super_block *sb,
{
struct ovl_fs *ofs = OVL_FS(sb);
struct dentry *upperdentry = oip->upperdentry;
- struct ovl_path *lowerpath = oip->lowerpath;
+ struct ovl_path *lowerpath = ovl_lowerpath(oip->oe);
struct inode *realinode = upperdentry ? d_inode(upperdentry) : NULL;
struct inode *inode;
struct dentry *lowerdentry = lowerpath ? lowerpath->dentry : NULL;
@@ -1369,7 +1376,9 @@ struct inode *ovl_get_inode(struct super_block *sb,
}
dput(upperdentry);
+ ovl_free_entry(oip->oe);
kfree(oip->redirect);
+ kfree(oip->lowerdata_redirect);
goto out;
}
@@ -1398,14 +1407,12 @@ struct inode *ovl_get_inode(struct super_block *sb,
if (oip->index)
ovl_set_flag(OVL_INDEX, inode);
- OVL_I(inode)->redirect = oip->redirect;
-
if (bylower)
ovl_set_flag(OVL_CONST_INO, inode);
/* Check for non-merge dir that may have whiteouts */
if (is_dir) {
- if (((upperdentry && lowerdentry) || oip->numlower > 1) ||
+ if (((upperdentry && lowerdentry) || ovl_numlower(oip->oe) > 1) ||
ovl_path_check_origin_xattr(ofs, &realpath)) {
ovl_set_flag(OVL_WHITEOUTS, inode);
}
generated by cgit 1.2.3-korg (git 2.39.0) at 2024-04-24 11:22:11 +0000