ceph/src/pmdk/src/core/fs_posix.c

   1 // SPDX-License-Identifier: BSD-3-Clause
   2 /* Copyright 2017-2020, Intel Corporation */
   3
   4 /*
   5  * fs_posix.c -- file system traversal Posix implementation
   6  */
   7
   8 #include <fts.h>
   9 #include "util.h"
  10 #include "out.h"
  11 #include "vec.h"
  12 #include "fs.h"
  13
  14 struct fs {
  15         FTS *ft;
  16         struct fs_entry entry;
  17 };
  18
  19 /*
  20  * fs_new -- creates fs traversal instance
  21  */
  22 struct fs *
  23 fs_new(const char *path)
  24 {
  25         struct fs *f = Zalloc(sizeof(*f));
  26         if (f == NULL)
  27                 goto error_fs_alloc;
  28
  29         const char *paths[2] = {path, NULL};
  30         f->ft = fts_open((char * const *)paths, FTS_COMFOLLOW | FTS_XDEV, NULL);
  31         if (f->ft == NULL)
  32                 goto error_fts_open;
  33
  34         return f;
  35
  36 error_fts_open:
  37         Free(f);
  38 error_fs_alloc:
  39         return NULL;
  40 }
  41
  42 /*
  43  * fs_read -- reads an entry from the fs path
  44  */
  45 struct fs_entry *
  46 fs_read(struct fs *f)
  47 {
  48         FTSENT *entry = fts_read(f->ft);
  49         if (entry == NULL)
  50                 return NULL;
  51
  52         switch (entry->fts_info) {
  53         case FTS_D:
  54                 f->entry.type = FS_ENTRY_DIRECTORY;
  55                 break;
  56         case FTS_F:
  57                 f->entry.type = FS_ENTRY_FILE;
  58                 break;
  59         case FTS_SL:
  60                 f->entry.type = FS_ENTRY_SYMLINK;
  61                 break;
  62         default:
  63                 f->entry.type = FS_ENTRY_OTHER;
  64                 break;
  65         }
  66
  67         f->entry.name = entry->fts_name;
  68         f->entry.namelen = entry->fts_namelen;
  69         f->entry.path = entry->fts_path;
  70         f->entry.pathlen = entry->fts_pathlen;
  71         f->entry.level = entry->fts_level;
  72
  73         return &f->entry;
  74 }
  75
  76 /*
  77  * fs_delete -- deletes a fs traversal instance
  78  */
  79 void
  80 fs_delete(struct fs *f)
  81 {
  82         fts_close(f->ft);
  83         Free(f);
  84 }