From 3ef46ccf8c0cd69b0194325cd1d6ecb3d2b8645e Mon Sep 17 00:00:00 2001
From: Gurjant Kalsi <me@gurjantkalsi.com>
Date: Mon, 16 Nov 2015 18:02:13 -0800
Subject: [spifs][fs] Bump dirents when files that they point to are deleted.

---
 lib/fs/spifs/spifs.c          | 20 +++++++++++++++-----
 lib/fs/spifs/test/spifstest.c | 42 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 57 insertions(+), 5 deletions(-)

(limited to 'lib')

diff --git a/lib/fs/spifs/spifs.c b/lib/fs/spifs/spifs.c
index 2b4df9b8..8f17b532 100644
--- a/lib/fs/spifs/spifs.c
+++ b/lib/fs/spifs/spifs.c
@@ -871,15 +871,25 @@ static status_t spifs_remove(fscookie *cookie, const char *name)
 
     spifs_file_t *file = find_file(spifs, name);
 
-    if (file) {
-        list_delete(&file->node);
-        free(file);
-        status = NO_ERROR;
-    } else {
+    if (!file) {
         status = ERR_NOT_FOUND;
         goto err;
     }
 
+    // Make sure there are no dirents open that point to the file that we're
+    // deleting.
+    dircookie *dcookie;
+    list_for_every_entry(&spifs->dcookies, dcookie, dircookie, node) {
+        if (dcookie->next_file == file) {
+            dcookie->next_file = list_next_type(&dcookie->fs->files,
+                                                &dcookie->next_file->node,
+                                                spifs_file_t, node);
+        }
+    }
+
+    list_delete(&file->node);
+    free(file);
+
     status = spifs_commit_toc(spifs);
 
 err:
diff --git a/lib/fs/spifs/test/spifstest.c b/lib/fs/spifs/test/spifstest.c
index ca3bb8b3..37c60daa 100644
--- a/lib/fs/spifs/test/spifstest.c
+++ b/lib/fs/spifs/test/spifstest.c
@@ -55,6 +55,7 @@ static bool test_rm_reclaim(const char *);
 static bool test_corrupt_toc(const char *);
 static bool test_write_with_offset(const char *);
 static bool test_read_write_big(const char *);
+static bool test_rm_active_dirent(const char *);
 
 static test tests[] = {
     {&test_empty_after_format, "Test no files in ToC after format.", 1},
@@ -68,6 +69,7 @@ static test tests[] = {
     {&test_corrupt_toc, "Test that FS can be mounted with one corrupt ToC.", 1},
     {&test_write_with_offset, "Test that files can be written to at an offset.", 1},
     {&test_read_write_big, "Test that an unaligned ~10kb buffer can be written and read.", 1},
+    {&test_rm_active_dirent, "Test that we can remove a file with an open dirent.", 1},
 };
 
 bool test_setup(const char *dev_name, uint32_t toc_pages)
@@ -578,11 +580,51 @@ static bool test_read_write_big(const char *dev_name)
     }
 
 err:
+    success &= fs_close_file(handle) == NO_ERROR;
+
     free(rbuf);
     free(wbuf);
     return success;
 }
 
+static bool test_rm_active_dirent(const char *dev_name)
+{
+    filehandle *handle;
+    status_t status = fs_create_file(TEST_FILE_PATH, &handle, 0);
+    if (status != NO_ERROR) {
+        return false;
+    }
+
+    status = fs_close_file(handle);
+    if (status != NO_ERROR) {
+        return false;
+    }
+
+    dirhandle *dhandle;
+    status = fs_open_dir(MNT_PATH, &dhandle);
+    if (status != NO_ERROR) {
+        return false;
+    }
+
+    // Dir handle should now be pointing to the only file in our FS.
+    status = fs_remove_file(TEST_FILE_PATH);
+    if (status != NO_ERROR) {
+        fs_close_dir(dhandle);
+        return false;
+    }
+
+    bool success = true;
+    struct dirent *ent = malloc(sizeof(*ent));
+    if (fs_read_dir(dhandle, ent) >= 0) {
+        success = false;
+    }
+
+    success &= fs_close_dir(dhandle) == NO_ERROR;
+    free(ent);
+
+    return success;
+}
+
 static int cmd_spifs(int argc, const cmd_args *argv)
 {
     if (argc < 3) {
-- 
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