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fuse-overlayfs: support also mv to empty directory with whiteouts

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Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
This commit is contained in:
Giuseppe Scrivano 2018-07-12 23:16:13 +02:00
parent 0cc1b77696
commit 85d1a08cf2
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GPG Key ID: E4730F97F60286ED
1 changed files with 33 additions and 32 deletions
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63
main.c
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@ -1742,6 +1742,36 @@ update_paths (struct ovl_node *node)
return 0;
}
static int
empty_dir (struct ovl_data *lo, struct ovl_node *node)
{
DIR *dp;
int fd;
fd = TEMP_FAILURE_RETRY (openat (get_upper_layer (lo)->fd, node->path, O_DIRECTORY));
if (fd < 0)
return -1;
dp = fdopendir (fd);
if (dp)
{
struct dirent *dent;
while (dp && ((dent = readdir (dp)) != NULL))
{
if (strcmp (dent->d_name, ".") == 0)
continue;
if (strcmp (dent->d_name, "..") == 0)
continue;
if (unlinkat (dirfd (dp), dent->d_name, 0) < 0)
unlinkat (dirfd (dp), dent->d_name, AT_REMOVEDIR);
}
closedir (dp);
}
return 0;
}
static void
do_rm (fuse_req_t req, fuse_ino_t parent, const char *name, bool dirp)
{
@ -1786,37 +1816,12 @@ do_rm (fuse_req_t req, fuse_ino_t parent, const char *name, bool dirp)
node->do_unlink = 1;
else
{
DIR *dp;
int fd;
fd = TEMP_FAILURE_RETRY (openat (get_upper_layer (lo)->fd, node->path, O_DIRECTORY));
if (fd < 0)
if (empty_dir (lo, node) < 0)
{
fuse_reply_err (req, errno);
return;
}
if (fd >= 0)
{
dp = fdopendir (fd);
if (dp)
{
struct dirent *dent;
while (dp && ((dent = readdir (dp)) != NULL))
{
if (strcmp (dent->d_name, ".") == 0)
continue;
if (strcmp (dent->d_name, "..") == 0)
continue;
if (unlinkat (dirfd (dp), dent->d_name, 0) < 0)
unlinkat (dirfd (dp), dent->d_name, AT_REMOVEDIR);
}
closedir (dp);
}
}
node->do_rmdir = 1;
}
}
@ -2627,12 +2632,8 @@ ovl_rename (fuse_req_t req, fuse_ino_t parent, const char *name,
goto error;
}
/* We support only the case where the destination is completely empty. */
if (whiteouts)
{
errno = EXDEV;
if (whiteouts && empty_dir (lo, destnode) < 0)
goto error;
}
if (create_missing_whiteouts (lo, node, destnode->path) < 0)
{