diff options
Diffstat (limited to 'source3/modules/vfs_dirsort.c')
| -rw-r--r-- | source3/modules/vfs_dirsort.c | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/source3/modules/vfs_dirsort.c b/source3/modules/vfs_dirsort.c new file mode 100644 index 0000000000..53d1820c11 --- /dev/null +++ b/source3/modules/vfs_dirsort.c @@ -0,0 +1,194 @@ +/* + * VFS module to provide a sorted directory list. + * + * Copyright (C) Andy Kelk (andy@mopoke.co.uk), 2009 + * + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <http://www.gnu.org/licenses/>. + */ + +#include "includes.h" + +static int compare_dirent (const void *a, const void *b) { + const SMB_STRUCT_DIRENT *da = (const SMB_STRUCT_DIRENT *) a; + const SMB_STRUCT_DIRENT *db = (const SMB_STRUCT_DIRENT *) b; + return StrCaseCmp(da->d_name, db->d_name); +} + +struct dirsort_privates { + long pos; + SMB_STRUCT_DIRENT *directory_list; + long number_of_entries; + time_t mtime; + SMB_STRUCT_DIR *source_directory; + int fd; +}; + +static void free_dirsort_privates(void **datap) { + struct dirsort_privates *data = (struct dirsort_privates *) *datap; + SAFE_FREE(data->directory_list); + SAFE_FREE(data); + *datap = NULL; + + return; +} + +static void open_and_sort_dir (vfs_handle_struct *handle) +{ + SMB_STRUCT_DIRENT *dp; + struct stat dir_stat; + long current_pos; + struct dirsort_privates *data = NULL; + + SMB_VFS_HANDLE_GET_DATA(handle, data, struct dirsort_privates, return); + + data->number_of_entries = 0; + + if (fstat(data->fd, &dir_stat) == 0) { + data->mtime = dir_stat.st_mtime; + } + + while (SMB_VFS_NEXT_READDIR(handle, data->source_directory, NULL) + != NULL) { + data->number_of_entries++; + } + + /* Open the underlying directory and count the number of entries + Skip back to the beginning as we'll read it again */ + SMB_VFS_NEXT_REWINDDIR(handle, data->source_directory); + + /* Set up an array and read the directory entries into it */ + SAFE_FREE(data->directory_list); /* destroy previous cache if needed */ + data->directory_list = (SMB_STRUCT_DIRENT *)SMB_MALLOC( + data->number_of_entries * sizeof(SMB_STRUCT_DIRENT)); + current_pos = data->pos; + data->pos = 0; + while ((dp = SMB_VFS_NEXT_READDIR(handle, data->source_directory, + NULL)) != NULL) { + data->directory_list[data->pos++] = *dp; + } + + /* Sort the directory entries by name */ + data->pos = current_pos; + qsort(data->directory_list, data->number_of_entries, + sizeof(SMB_STRUCT_DIRENT), compare_dirent); +} + +static SMB_STRUCT_DIR *dirsort_opendir(vfs_handle_struct *handle, + const char *fname, const char *mask, + uint32 attr) +{ + struct dirsort_privates *data = NULL; + + /* set up our private data about this directory */ + data = (struct dirsort_privates *)SMB_MALLOC( + sizeof(struct dirsort_privates)); + + data->directory_list = NULL; + data->pos = 0; + + /* Open the underlying directory and count the number of entries */ + data->source_directory = SMB_VFS_NEXT_OPENDIR(handle, fname, mask, + attr); + + data->fd = dirfd(data->source_directory); + + SMB_VFS_HANDLE_SET_DATA(handle, data, free_dirsort_privates, + struct dirsort_privates, return NULL); + + open_and_sort_dir(handle); + + return data->source_directory; +} + +static SMB_STRUCT_DIRENT *dirsort_readdir(vfs_handle_struct *handle, + SMB_STRUCT_DIR *dirp) +{ + struct dirsort_privates *data = NULL; + time_t current_mtime; + struct stat dir_stat; + + SMB_VFS_HANDLE_GET_DATA(handle, data, struct dirsort_privates, + return NULL); + + if (fstat(data->fd, &dir_stat) == -1) { + return NULL; + } + + current_mtime = dir_stat.st_mtime; + + /* throw away cache and re-read the directory if we've changed */ + if (current_mtime > data->mtime) { + open_and_sort_dir(handle); + } + + if (data->pos >= data->number_of_entries) { + return NULL; + } + + return &data->directory_list[data->pos++]; +} + +static void dirsort_seekdir(vfs_handle_struct *handle, SMB_STRUCT_DIR *dirp, + long offset) +{ + struct dirsort_privates *data = NULL; + SMB_VFS_HANDLE_GET_DATA(handle, data, struct dirsort_privates, return); + + data->pos = offset; +} + +static long dirsort_telldir(vfs_handle_struct *handle, SMB_STRUCT_DIR *dirp) +{ + struct dirsort_privates *data = NULL; + SMB_VFS_HANDLE_GET_DATA(handle, data, struct dirsort_privates, + return -1); + + return data->pos; +} + +static void dirsort_rewinddir(vfs_handle_struct *handle, SMB_STRUCT_DIR *dirp) +{ + struct dirsort_privates *data = NULL; + SMB_VFS_HANDLE_GET_DATA(handle, data, struct dirsort_privates, return); + + data->pos = 0; +} + +/* VFS operations structure */ + +static vfs_op_tuple dirsort_op_tuples[] = { + + /* Directory operations */ + + {SMB_VFS_OP(dirsort_opendir), SMB_VFS_OP_OPENDIR, + SMB_VFS_LAYER_TRANSPARENT}, + {SMB_VFS_OP(dirsort_readdir), SMB_VFS_OP_READDIR, + SMB_VFS_LAYER_TRANSPARENT}, + {SMB_VFS_OP(dirsort_seekdir), SMB_VFS_OP_SEEKDIR, + SMB_VFS_LAYER_TRANSPARENT}, + {SMB_VFS_OP(dirsort_telldir), SMB_VFS_OP_TELLDIR, + SMB_VFS_LAYER_TRANSPARENT}, + {SMB_VFS_OP(dirsort_rewinddir), SMB_VFS_OP_REWINDDIR, + SMB_VFS_LAYER_TRANSPARENT}, + + {NULL, SMB_VFS_OP_NOOP, + SMB_VFS_LAYER_NOOP} +}; + +NTSTATUS vfs_dirsort_init(void) +{ + return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "dirsort", + dirsort_op_tuples); +} |