AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2024-11-24 10:20:49 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity

ovl: multi-layer readdir

Browse Source 
If multiple lower layers exist, merge them as well in readdir according to
the same rules as merging upper with lower.  I.e. take whiteouts and opaque
directories into account on all but the lowers layer.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
This commit is contained in:
Miklos Szeredi 2014-12-13 00:59:44 +01:00
parent 5ef88da56a
commit 9d7459d834
2 changed files with 22 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
fs/overlayfs/readdir.c
View File

@ -261,35 +261,34 @@ static void ovl_dir_reset(struct file *file)
static int ovl_dir_read_merged(struct dentry *dentry, struct list_head *list)
{
int err;
struct path lowerpath;
struct path upperpath;
struct path realpath;
struct ovl_readdir_data rdd = {
.ctx.actor = ovl_fill_merge,
.list = list,
.root = RB_ROOT,
.is_merge = false,
};
int idx, next;
ovl_path_lower(dentry, &lowerpath);
ovl_path_upper(dentry, &upperpath);
for (idx = 0; idx != -1; idx = next) {
next = ovl_path_next(idx, dentry, &realpath);
if (upperpath.dentry) {
rdd.dir = upperpath.dentry;
err = ovl_dir_read(&upperpath, &rdd);
if (err)
goto out;
if (next != -1) {
rdd.dir = realpath.dentry;
err = ovl_dir_read(&realpath, &rdd);
if (err)
break;
} else {
/*
* Insert lowest layer entries before upper ones, this
* allows offsets to be reasonably constant
*/
list_add(&rdd.middle, rdd.list);
rdd.is_merge = true;
err = ovl_dir_read(&realpath, &rdd);
list_del(&rdd.middle);
}
}
if (lowerpath.dentry) {
/*
* Insert lowerpath entries before upperpath ones, this allows
* offsets to be reasonably constant
*/
list_add(&rdd.middle, rdd.list);
rdd.is_merge = true;
err = ovl_dir_read(&lowerpath, &rdd);
list_del(&rdd.middle);
}
out:
return err;
}

3
fs/overlayfs/super.c
View File

@ -81,6 +81,9 @@ enum ovl_path_type ovl_path_type(struct dentry *dentry)
} else if (!oe->opaque) {
type |= __OVL_PATH_PURE;
}
} else {
if (oe->numlower > 1)
type |= __OVL_PATH_MERGE;
}
return type;
}