1 /*
2 * filefrag.c --- display the fragmentation information for a file
3 *
4 * Copyright (C) 2011 Theodore Ts'o. This file may be redistributed
5 * under the terms of the GNU Public License.
6 */
7
8 #include "config.h"
9 #include <stdio.h>
10 #include <unistd.h>
11 #include <stdlib.h>
12 #include <ctype.h>
13 #include <string.h>
14 #include <time.h>
15 #ifdef HAVE_ERRNO_H
16 #include <errno.h>
17 #endif
18 #include <sys/types.h>
19 #include <sys/stat.h>
20 #include <fcntl.h>
21 #include <utime.h>
22 #ifdef HAVE_GETOPT_H
23 #include <getopt.h>
24 #else
25 extern int optind;
26 extern char *optarg;
27 #endif
28
29 #include "debugfs.h"
30
31 #define VERBOSE_OPT 0x0001
32 #define DIR_OPT 0x0002
33 #define RECURSIVE_OPT 0x0004
34
35 struct dir_list {
36 char *name;
37 ext2_ino_t ino;
38 struct dir_list *next;
39 };
40
41 struct filefrag_struct {
42 FILE *f;
43 const char *name;
44 const char *dir_name;
45 int options;
46 int logical_width;
47 int physical_width;
48 int ext;
49 int cont_ext;
50 e2_blkcnt_t num;
51 e2_blkcnt_t logical_start;
52 blk64_t physical_start;
53 blk64_t expected;
54 struct dir_list *dir_list, *dir_last;
55 };
56
int_log10(unsigned long long arg)57 static int int_log10(unsigned long long arg)
58 {
59 int l = 0;
60
61 arg = arg / 10;
62 while (arg) {
63 l++;
64 arg = arg / 10;
65 }
66 return l;
67 }
68
print_header(struct filefrag_struct * fs)69 static void print_header(struct filefrag_struct *fs)
70 {
71 if (fs->options & VERBOSE_OPT) {
72 fprintf(fs->f, "%4s %*s %*s %*s %*s\n", "ext",
73 fs->logical_width, "logical", fs->physical_width,
74 "physical", fs->physical_width, "expected",
75 fs->logical_width, "length");
76 }
77 }
78
report_filefrag(struct filefrag_struct * fs)79 static void report_filefrag(struct filefrag_struct *fs)
80 {
81 if (fs->num == 0)
82 return;
83 if (fs->options & VERBOSE_OPT) {
84 if (fs->expected)
85 fprintf(fs->f, "%4d %*lu %*llu %*llu %*lu\n", fs->ext,
86 fs->logical_width,
87 (unsigned long) fs->logical_start,
88 fs->physical_width, fs->physical_start,
89 fs->physical_width, fs->expected,
90 fs->logical_width, (unsigned long) fs->num);
91 else
92 fprintf(fs->f, "%4d %*lu %*llu %*s %*lu\n", fs->ext,
93 fs->logical_width,
94 (unsigned long) fs->logical_start,
95 fs->physical_width, fs->physical_start,
96 fs->physical_width, "",
97 fs->logical_width, (unsigned long) fs->num);
98 }
99 fs->ext++;
100 }
101
filefrag_blocks_proc(ext2_filsys ext4_fs EXT2FS_ATTR ((unused)),blk64_t * blocknr,e2_blkcnt_t blockcnt,blk64_t ref_block EXT2FS_ATTR ((unused)),int ref_offset EXT2FS_ATTR ((unused)),void * private)102 static int filefrag_blocks_proc(ext2_filsys ext4_fs EXT2FS_ATTR((unused)),
103 blk64_t *blocknr, e2_blkcnt_t blockcnt,
104 blk64_t ref_block EXT2FS_ATTR((unused)),
105 int ref_offset EXT2FS_ATTR((unused)),
106 void *private)
107 {
108 struct filefrag_struct *fs = private;
109
110 if (blockcnt < 0 || *blocknr == 0)
111 return 0;
112
113 if ((fs->num == 0) || (blockcnt != fs->logical_start + fs->num) ||
114 (*blocknr != fs->physical_start + fs->num)) {
115 report_filefrag(fs);
116 if (blockcnt == fs->logical_start + fs->num)
117 fs->expected = fs->physical_start + fs->num;
118 else
119 fs->expected = 0;
120 fs->logical_start = blockcnt;
121 fs->physical_start = *blocknr;
122 fs->num = 1;
123 fs->cont_ext++;
124 } else
125 fs->num++;
126 return 0;
127 }
128
filefrag(ext2_ino_t ino,struct ext2_inode * inode,struct filefrag_struct * fs)129 static void filefrag(ext2_ino_t ino, struct ext2_inode *inode,
130 struct filefrag_struct *fs)
131 {
132 errcode_t retval;
133 int blocksize = current_fs->blocksize;
134
135 fs->logical_width = int_log10((EXT2_I_SIZE(inode) + blocksize - 1) /
136 blocksize) + 1;
137 if (fs->logical_width < 7)
138 fs->logical_width = 7;
139 fs->ext = 0;
140 fs->cont_ext = 0;
141 fs->logical_start = 0;
142 fs->physical_start = 0;
143 fs->num = 0;
144
145 if (fs->options & VERBOSE_OPT) {
146 blk64_t num_blocks = ext2fs_inode_i_blocks(current_fs, inode);
147
148 if (!ext2fs_has_feature_huge_file(current_fs->super) ||
149 !(inode->i_flags & EXT4_HUGE_FILE_FL))
150 num_blocks /= current_fs->blocksize / 512;
151
152 fprintf(fs->f, "\n%s has %llu block(s), i_size is %llu\n",
153 fs->name, num_blocks, EXT2_I_SIZE(inode));
154 }
155 print_header(fs);
156 if (ext2fs_inode_has_valid_blocks2(current_fs, inode)) {
157 retval = ext2fs_block_iterate3(current_fs, ino,
158 BLOCK_FLAG_READ_ONLY, NULL,
159 filefrag_blocks_proc, fs);
160 if (retval)
161 com_err("ext2fs_block_iterate3", retval, 0);
162 }
163
164 report_filefrag(fs);
165 fprintf(fs->f, "%s: %d contiguous extents%s\n", fs->name, fs->ext,
166 LINUX_S_ISDIR(inode->i_mode) ? " (dir)" : "");
167 }
168
filefrag_dir_proc(ext2_ino_t dir EXT2FS_ATTR ((unused)),int entry,struct ext2_dir_entry * dirent,int offset EXT2FS_ATTR ((unused)),int blocksize EXT2FS_ATTR ((unused)),char * buf EXT2FS_ATTR ((unused)),void * private)169 static int filefrag_dir_proc(ext2_ino_t dir EXT2FS_ATTR((unused)),
170 int entry,
171 struct ext2_dir_entry *dirent,
172 int offset EXT2FS_ATTR((unused)),
173 int blocksize EXT2FS_ATTR((unused)),
174 char *buf EXT2FS_ATTR((unused)),
175 void *private)
176 {
177 struct filefrag_struct *fs = private;
178 struct ext2_inode inode;
179 ext2_ino_t ino;
180 char name[EXT2_NAME_LEN + 1];
181 char *cp;
182 int thislen;
183
184 if (entry == DIRENT_DELETED_FILE)
185 return 0;
186
187 thislen = ext2fs_dirent_name_len(dirent);
188 strncpy(name, dirent->name, thislen);
189 name[thislen] = '\0';
190 ino = dirent->inode;
191
192 if (!strcmp(name, ".") || !strcmp(name, ".."))
193 return 0;
194
195 cp = malloc(strlen(fs->dir_name) + strlen(name) + 2);
196 if (!cp) {
197 fprintf(stderr, "Couldn't allocate memory for %s/%s\n",
198 fs->dir_name, name);
199 return 0;
200 }
201
202 sprintf(cp, "%s/%s", fs->dir_name, name);
203 fs->name = cp;
204
205 if (debugfs_read_inode(ino, &inode, fs->name))
206 goto errout;
207
208 filefrag(ino, &inode, fs);
209
210 if ((fs->options & RECURSIVE_OPT) && LINUX_S_ISDIR(inode.i_mode)) {
211 struct dir_list *p;
212
213 p = malloc(sizeof(struct dir_list));
214 if (!p) {
215 fprintf(stderr, "Couldn't allocate dir_list for %s\n",
216 fs->name);
217 goto errout;
218 }
219 memset(p, 0, sizeof(struct dir_list));
220 p->name = cp;
221 p->ino = ino;
222 if (fs->dir_last)
223 fs->dir_last->next = p;
224 else
225 fs->dir_list = p;
226 fs->dir_last = p;
227 return 0;
228 }
229 errout:
230 free(cp);
231 fs->name = 0;
232 return 0;
233 }
234
235
dir_iterate(ext2_ino_t ino,struct filefrag_struct * fs)236 static void dir_iterate(ext2_ino_t ino, struct filefrag_struct *fs)
237 {
238 errcode_t retval;
239 struct dir_list *p = NULL;
240
241 fs->dir_name = fs->name;
242
243 while (1) {
244 retval = ext2fs_dir_iterate2(current_fs, ino, 0,
245 0, filefrag_dir_proc, fs);
246 if (retval)
247 com_err("ext2fs_dir_iterate2", retval, 0);
248 if (p) {
249 free(p->name);
250 fs->dir_list = p->next;
251 if (!fs->dir_list)
252 fs->dir_last = 0;
253 free(p);
254 }
255 p = fs->dir_list;
256 if (!p)
257 break;
258 ino = p->ino;
259 fs->dir_name = p->name;
260 }
261 }
262
do_filefrag(int argc,char * argv[],int sci_idx EXT2FS_ATTR ((unused)),void * infop EXT2FS_ATTR ((unused)))263 void do_filefrag(int argc, char *argv[], int sci_idx EXT2FS_ATTR((unused)),
264 void *infop EXT2FS_ATTR((unused)))
265 {
266 struct filefrag_struct fs;
267 struct ext2_inode inode;
268 ext2_ino_t ino;
269 int c;
270
271 memset(&fs, 0, sizeof(fs));
272 if (check_fs_open(argv[0]))
273 return;
274
275 reset_getopt();
276 while ((c = getopt(argc, argv, "dvr")) != EOF) {
277 switch (c) {
278 case 'd':
279 fs.options |= DIR_OPT;
280 break;
281 case 'v':
282 fs.options |= VERBOSE_OPT;
283 break;
284 case 'r':
285 fs.options |= RECURSIVE_OPT;
286 break;
287 default:
288 goto print_usage;
289 }
290 }
291
292 if (argc > optind+1) {
293 print_usage:
294 com_err(0, 0, "Usage: filefrag [-dvr] file");
295 return;
296 }
297
298 if (argc == optind) {
299 ino = cwd;
300 fs.name = ".";
301 } else {
302 ino = string_to_inode(argv[optind]);
303 fs.name = argv[optind];
304 }
305 if (!ino)
306 return;
307
308 if (debugfs_read_inode(ino, &inode, argv[0]))
309 return;
310
311 fs.f = open_pager();
312 fs.physical_width = int_log10(ext2fs_blocks_count(current_fs->super));
313 fs.physical_width++;
314 if (fs.physical_width < 8)
315 fs.physical_width = 8;
316
317 if (!LINUX_S_ISDIR(inode.i_mode) || (fs.options & DIR_OPT))
318 filefrag(ino, &inode, &fs);
319 else
320 dir_iterate(ino, &fs);
321
322 fprintf(fs.f, "\n");
323 close_pager(fs.f);
324
325 return;
326 }
327