From: Amir Goldstein Date: Mon, 3 Apr 2023 08:29:59 +0000 (+0300) Subject: ovl: update of dentry revalidate flags after copy up X-Git-Tag: v6.1.39~311 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e4f2a1feebb3f209a0fca82aa53507a5b8be4d53;p=platform%2Fkernel%2Flinux-starfive.git ovl: update of dentry revalidate flags after copy up [ Upstream commit b07d5cc93e1b28df47a72c519d09d0a836043613 ] After copy up, we may need to update d_flags if upper dentry is on a remote fs and lower dentries are not. Add helpers to allow incremental update of the revalidate flags. Fixes: bccece1ead36 ("ovl: allow remote upper") Reviewed-by: Gao Xiang Signed-off-by: Amir Goldstein Signed-off-by: Miklos Szeredi Signed-off-by: Sasha Levin --- diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c index 91a95bf..edc1ebf 100644 --- a/fs/overlayfs/copy_up.c +++ b/fs/overlayfs/copy_up.c @@ -538,6 +538,7 @@ static int ovl_link_up(struct ovl_copy_up_ctx *c) /* Restore timestamps on parent (best effort) */ ovl_set_timestamps(ofs, upperdir, &c->pstat); ovl_dentry_set_upper_alias(c->dentry); + ovl_dentry_update_reval(c->dentry, upper); } } inode_unlock(udir); @@ -857,6 +858,7 @@ static int ovl_do_copy_up(struct ovl_copy_up_ctx *c) inode_unlock(udir); ovl_dentry_set_upper_alias(c->dentry); + ovl_dentry_update_reval(c->dentry, ovl_dentry_upper(c->dentry)); } out: diff --git a/fs/overlayfs/dir.c b/fs/overlayfs/dir.c index c3032ce..5339ff0 100644 --- a/fs/overlayfs/dir.c +++ b/fs/overlayfs/dir.c @@ -269,8 +269,7 @@ static int ovl_instantiate(struct dentry *dentry, struct inode *inode, ovl_dir_modified(dentry->d_parent, false); ovl_dentry_set_upper_alias(dentry); - ovl_dentry_update_reval(dentry, newdentry, - DCACHE_OP_REVALIDATE | DCACHE_OP_WEAK_REVALIDATE); + ovl_dentry_init_reval(dentry, newdentry); if (!hardlink) { /* diff --git a/fs/overlayfs/export.c b/fs/overlayfs/export.c index ac9c3ad..e55363d 100644 --- a/fs/overlayfs/export.c +++ b/fs/overlayfs/export.c @@ -326,8 +326,7 @@ static struct dentry *ovl_obtain_alias(struct super_block *sb, if (upper_alias) ovl_dentry_set_upper_alias(dentry); - ovl_dentry_update_reval(dentry, upper, - DCACHE_OP_REVALIDATE | DCACHE_OP_WEAK_REVALIDATE); + ovl_dentry_init_reval(dentry, upper); return d_instantiate_anon(dentry, inode); diff --git a/fs/overlayfs/namei.c b/fs/overlayfs/namei.c index 0fd1d5f..655d08d 100644 --- a/fs/overlayfs/namei.c +++ b/fs/overlayfs/namei.c @@ -1116,8 +1116,7 @@ struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry, ovl_set_flag(OVL_UPPERDATA, inode); } - ovl_dentry_update_reval(dentry, upperdentry, - DCACHE_OP_REVALIDATE | DCACHE_OP_WEAK_REVALIDATE); + ovl_dentry_init_reval(dentry, upperdentry); revert_creds(old_cred); if (origin_path) { diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h index e74a610..052226a 100644 --- a/fs/overlayfs/overlayfs.h +++ b/fs/overlayfs/overlayfs.h @@ -360,8 +360,10 @@ bool ovl_index_all(struct super_block *sb); bool ovl_verify_lower(struct super_block *sb); struct ovl_entry *ovl_alloc_entry(unsigned int numlower); bool ovl_dentry_remote(struct dentry *dentry); -void ovl_dentry_update_reval(struct dentry *dentry, struct dentry *upperdentry, - unsigned int mask); +void ovl_dentry_update_reval(struct dentry *dentry, struct dentry *realdentry); +void ovl_dentry_init_reval(struct dentry *dentry, struct dentry *upperdentry); +void ovl_dentry_init_flags(struct dentry *dentry, struct dentry *upperdentry, + unsigned int mask); bool ovl_dentry_weird(struct dentry *dentry); enum ovl_path_type ovl_path_type(struct dentry *dentry); void ovl_path_upper(struct dentry *dentry, struct path *path); diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c index 3d14a3f..51eec4a 100644 --- a/fs/overlayfs/super.c +++ b/fs/overlayfs/super.c @@ -1980,7 +1980,7 @@ static struct dentry *ovl_get_root(struct super_block *sb, ovl_dentry_set_flag(OVL_E_CONNECTED, root); ovl_set_upperdata(d_inode(root)); ovl_inode_init(d_inode(root), &oip, ino, fsid); - ovl_dentry_update_reval(root, upperdentry, DCACHE_OP_WEAK_REVALIDATE); + ovl_dentry_init_flags(root, upperdentry, DCACHE_OP_WEAK_REVALIDATE); return root; } diff --git a/fs/overlayfs/util.c b/fs/overlayfs/util.c index 81a57a8..850e8d1 100644 --- a/fs/overlayfs/util.c +++ b/fs/overlayfs/util.c @@ -94,14 +94,30 @@ struct ovl_entry *ovl_alloc_entry(unsigned int numlower) return oe; } +#define OVL_D_REVALIDATE (DCACHE_OP_REVALIDATE | DCACHE_OP_WEAK_REVALIDATE) + bool ovl_dentry_remote(struct dentry *dentry) { - return dentry->d_flags & - (DCACHE_OP_REVALIDATE | DCACHE_OP_WEAK_REVALIDATE); + return dentry->d_flags & OVL_D_REVALIDATE; +} + +void ovl_dentry_update_reval(struct dentry *dentry, struct dentry *realdentry) +{ + if (!ovl_dentry_remote(realdentry)) + return; + + spin_lock(&dentry->d_lock); + dentry->d_flags |= realdentry->d_flags & OVL_D_REVALIDATE; + spin_unlock(&dentry->d_lock); +} + +void ovl_dentry_init_reval(struct dentry *dentry, struct dentry *upperdentry) +{ + return ovl_dentry_init_flags(dentry, upperdentry, OVL_D_REVALIDATE); } -void ovl_dentry_update_reval(struct dentry *dentry, struct dentry *upperdentry, - unsigned int mask) +void ovl_dentry_init_flags(struct dentry *dentry, struct dentry *upperdentry, + unsigned int mask) { struct ovl_entry *oe = OVL_E(dentry); unsigned int i, flags = 0;