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Date: Thu, 21 Jun 2007 10:56:43 +0900
From: "Takashi Sato" <t-sato@...jp.nec.com>
To: linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: [RFC][PATCH 10/10] Online defrag command
- The defrag command. Usage is as follows:
o Put the multiple files closer together.
# e4defrag -r directory-name
o Defrag for free space fragmentation.
# e4defrag -f file-name
o Defrag for a single file.
# e4defrag file-name
o Defrag for all files on ext4.
# e4defrag device-name
Signed-off-by: Takashi Sato <t-sato@...jp.nec.com>
Signed-off-by: Akira Fujita <a-fujita@...jp.nec.com>
---
/*
* e4defrag.c - ext4 filesystem defragmenter
*/
#ifndef _LARGEFILE_SOURCE
#define _LARGEFILE_SOURCE
#endif
#ifndef _LARGEFILE64_SOURCE
#define _LARGEFILE64_SOURCE
#endif
#define _XOPEN_SOURCE 500
#include <ftw.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <dirent.h>
#include <limits.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <sys/statfs.h>
#include <sys/vfs.h>
#include <sys/ioctl.h>
#include <mntent.h>
#include <linux/fs.h>
#include <ctype.h>
#define EXT4_IOC_DEFRAG _IOW('f', 10, struct ext4_ext_defrag_data)
#define EXT4_IOC_GROUP_INFO _IOW('f', 11, struct ext4_group_data_info)
#define EXT4_IOC_FREE_BLOCKS_INFO _IOW('f', 12, struct ext4_extents_info)
#define EXT4_IOC_EXTENTS_INFO _IOW('f', 13, struct ext4_extents_info)
#define EXT4_IOC_RESERVE_BLOCK _IOW('f', 14, struct ext4_extents_info)
#define EXT4_IOC_MOVE_VICTIM _IOW('f', 15, struct ext4_extents_info)
#define EXT4_IOC_BLOCK_RELEASE _IO('f', 16)
#define _FILE_OFFSET_BITS 64
#define ext4_fsblk_t unsigned long long
#define DEFRAG_MAX_ENT 32
/* Extent status which are used in ext_in_group */
#define EXT4_EXT_USE 0
#define EXT4_EXT_FREE 1
#define EXT4_EXT_RESERVE 2
/* Insert list2 after list1 */
#define insert(list1,list2) { list2 ->next = list1->next;\
list1->next->prev = list2;\
list2->prev = list1;\
list1->next = list2;\
}
#define DEFRAG_RESERVE_BLOCK_SECOND 2
/* Magic number for ext4 */
#define EXT4_SUPER_MAGIC 0xEF53
/* The number of pages to defrag at one time */
#define DEFRAG_PAGES 128
/* Maximum length of contiguous blocks */
#define MAX_BLOCKS_LEN 16384
/* Force defrag mode: Max file size in bytes (128MB) */
#define MAX_FILE_SIZE (unsigned long)1 << 27
/* Force defrag mode: Max filesystem relative offset (48bit) */
#define MAX_FS_OFFSET_BIT 48
/* Data type for filesystem-wide blocks number */
#define ext4_fsblk_t unsigned long long
/* Ioctl command */
#define EXT4_IOC_FIBMAP _IOW('f', 9, ext4_fsblk_t)
#define EXT4_IOC_DEFRAG _IOW('f', 10, struct ext4_ext_defrag_data)
#define DEVNAME 0
#define DIRNAME 1
#define FILENAME 2
#define RETURN_OK 0
#define RETURN_NG -1
#define FTW_CONT 0
#define FTW_STOP -1
#define FTW_OPEN_FD 2000
#define FILE_CHK_OK 0
#define FILE_CHK_NG -1
#define FS_EXT4 "ext4dev"
#define ROOT_UID 0
/* Defrag block size, in bytes */
#define DEFRAG_SIZE 67108864
#define min(x,y) (((x) > (y)) ? (y) : (x))
#define PRINT_ERR_MSG(msg) fprintf(stderr, "%s\n", (msg));
#define PRINT_FILE_NAME(file) fprintf(stderr, "\t\t \"%s\"\n", (file));
#define MSG_USAGE \
"Usage : e4defrag [-v] file...| directory...| device...\n\
: e4defrag -f file [blocknr] \n\
: e4defrag -r directory... | device... \n"
#define MSG_R_OPTION " with regional block allocation mode.\n"
#define NGMSG_MTAB "\te4defrag : Can not access /etc/mtab."
#define NGMSG_UNMOUNT "\te4defrag : FS is not mounted."
#define NGMSG_EXT4 "\te4defrag : FS is not ext4 File System."
#define NGMSG_FS_INFO "\te4defrag : get FSInfo fail."
#define NGMSG_FILE_INFO "\te4defrag : get FileInfo fail."
#define NGMSG_FILE_OPEN "\te4defrag : open fail."
#define NGMSG_FILE_SYNC "\te4defrag : sync(fsync) fail."
#define NGMSG_FILE_DEFRAG "\te4defrag : defrag fail."
#define NGMSG_FILE_BLOCKSIZE "\te4defrag : can't get blocksize."
#define NGMSG_FILE_FIBMAP "\te4defrag : can't get block number."
#define NGMSG_FILE_UNREG "\te4defrag : File is not regular file."
#define NGMSG_FILE_LARGE \
"\te4defrag : Defrag size is larger than FileSystem's free space."
#define NGMSG_FILE_PRIORITY \
"\te4defrag : File is not current user's file or current user is not root."
#define NGMSG_FILE_LOCK "\te4defrag : File is locked."
#define NGMSG_FILE_BLANK "\te4defrag : File size is 0."
#define NGMSG_GET_LCKINFO "\te4defrag : get LockInfo fail."
#define NGMSG_TYPE \
"e4defrag : Can not process %s in regional mode\n."
#define NGMSG_REALPATH "\te4defrag : Can not get full path."
struct ext4_extent_data {
unsigned long long block; /* start logical block number */
ext4_fsblk_t start; /* start physical block number */
int len; /* blocks count */
};
/* Used for defrag */
struct ext4_ext_defrag_data {
ext4_fsblk_t start_offset; /* start offset to defrag in blocks */
ext4_fsblk_t defrag_size; /* size of defrag in blocks */
ext4_fsblk_t goal; /* block offset for allocation */
int flag; /* free space mode flag */
struct ext4_extent_data ext;
};
struct ext4_group_data_info {
int s_blocks_per_group; /* blocks per group */
int s_inodes_per_group; /* inodes per group */
};
struct ext4_extents_info {
unsigned long long ino; /* inode number */
int max_entries; /* maximum extents count */
int entries; /* extent number/count */
unsigned long offset;
ext4_fsblk_t goal;
struct ext4_extent_data ext[DEFRAG_MAX_ENT];
};
typedef struct ext_in_group {
struct ext_in_group *prev;
unsigned long tag; /* Extent status */
unsigned long ino; /* File`s inode number */
struct ext4_extent_data data; /* Extent belong to file */
struct ext_in_group *next;
}extlist;
typedef struct big_extent {
struct big_extent *prev;
extlist *start; /* Start ext */
extlist *end; /* End ext */
int big_len; /* Length of this continuous region */
struct big_extent *next;
}bigext;
typedef struct ext_group_wrap {
struct ext_group_wrap *prev, *next;
struct ext_in_group *group_ext;
}ext_wrap;
int force_flag = 0;
int detail_flag = 0;
int regional_flag = 0;
int amount_cnt = 0;
int succeed_cnt = 0;
ext4_fsblk_t goal = 0;
ext4_fsblk_t fgoal = -1;
/*
* Check if there's enough disk space
*/
int check_free_size(int fd, const struct stat64 *sb)
{
struct statfs fsbuf;
off64_t file_asize = 0;
off64_t fsize = 0;
/* target file size */
fsize = sb->st_size;
if (fstatfs(fd, &fsbuf) < 0) {
if (detail_flag) {
perror(NGMSG_FS_INFO);
}
return RETURN_NG;
}
/* Compute free space for root and normal user separately */
if (getuid() == ROOT_UID) {
file_asize = (off64_t)fsbuf.f_bsize * fsbuf.f_bfree;
} else {
file_asize = (off64_t)fsbuf.f_bsize * fsbuf.f_bavail;
}
if (file_asize >= fsize) {
return RETURN_OK;
}
return RETURN_NG;
}
int file_check(int fd, const struct stat64 * buf, const char * file_name);
int force_defrag(int fd, const struct stat64 *sb, int blocksize);
/*
* Check file attributes and ioctl call to avoid illegal operations
*/
int
ftw_fn(const char *file, const struct stat64 *sb, int flag, struct FTW *ftwbuf)
{
struct ext4_ext_defrag_data df_data;
loff_t start = 0;
int defraged_size = 0;
int blocksize;
int fd;
if (flag == FTW_F) {
amount_cnt++;
if ((fd = open64(file, O_RDONLY)) < 0) {
if (detail_flag) {
perror(NGMSG_FILE_OPEN);
PRINT_FILE_NAME(file);
}
return FTW_CONT;
}
if (file_check(fd, sb, file) == FILE_CHK_NG) {
close(fd);
return FTW_CONT;
}
if (fsync(fd) < 0) {
if (detail_flag) {
perror(NGMSG_FILE_SYNC);
PRINT_FILE_NAME(file);
}
close(fd);
return FTW_CONT;
}
/* Get blocksize */
if (ioctl(fd, FIGETBSZ, &blocksize) < 0) {
if (detail_flag) {
perror(NGMSG_FILE_BLOCKSIZE);
PRINT_FILE_NAME(file);
}
return FTW_CONT;
}
/* Ioctl call does the actual defragment job. */
df_data.start_offset = 0;
df_data.goal = goal;
df_data.ext.len = 0;
if (force_flag)
df_data.flag = 1;
while (1) {
df_data.defrag_size =
(min((sb->st_size - start),
DEFRAG_SIZE) + blocksize - 1) /
blocksize;
/* EXT4_IOC_DEFRAG */
defraged_size = ioctl(fd, EXT4_IOC_DEFRAG, &df_data);
if ((defraged_size < 0) && (force_flag == 1) &&
(errno == ENOSPC) && sb->st_size <= MAX_FILE_SIZE) {
defraged_size = force_defrag(fd, sb, blocksize);
if (defraged_size *blocksize >= sb->st_size) {
/* Whole file is enforcedly defraged */
break;
} else {
defraged_size = RETURN_NG;
}
}
if (defraged_size < 0) {
if (detail_flag) {
perror(NGMSG_FILE_DEFRAG);
PRINT_FILE_NAME(file);
}
close(fd);
return FTW_CONT;
}
df_data.start_offset += defraged_size;
start = df_data.start_offset * blocksize;
/* End of file */
if (start >= sb->st_size) {
break;
}
}
close(fd);
succeed_cnt++;
} else {
if (detail_flag) {
PRINT_ERR_MSG(NGMSG_FILE_UNREG);
PRINT_FILE_NAME(file);
}
}
return FTW_CONT;
}
/*
* Check file's attributes
*/
int file_check(int fd, const struct stat64 *buf, const char *file_name)
{
struct flock lock;
lock.l_type = F_WRLCK; /* Write-lock check is more reliable. */
lock.l_start = 0;
lock.l_whence = SEEK_SET;
lock.l_len = 0;
/* Regular file */
if (S_ISREG(buf->st_mode) == 0) {
if (detail_flag) {
PRINT_ERR_MSG(NGMSG_FILE_UNREG);
PRINT_FILE_NAME(file_name);
}
return FILE_CHK_NG;
}
/* Available space */
if (check_free_size(fd, buf) == RETURN_NG) {
if (detail_flag) {
PRINT_ERR_MSG(NGMSG_FILE_LARGE);
PRINT_FILE_NAME(file_name);
}
return FILE_CHK_NG;
}
/* Priority */
if (getuid() != ROOT_UID &&
buf->st_uid != getuid()) {
if (detail_flag) {
PRINT_ERR_MSG(NGMSG_FILE_PRIORITY);
PRINT_FILE_NAME(file_name);
}
return FILE_CHK_NG;
}
/* Lock status */
if (fcntl(fd, F_GETLK, &lock) < 0) {
if (detail_flag) {
perror(NGMSG_GET_LCKINFO);
PRINT_FILE_NAME(file_name);
}
return FILE_CHK_NG;
} else if (lock.l_type != F_UNLCK) {
if (detail_flag) {
PRINT_ERR_MSG(NGMSG_FILE_LOCK);
PRINT_FILE_NAME(file_name);
}
return FILE_CHK_NG;
}
/* Empty file */
if (buf->st_size == 0) {
if (detail_flag) {
PRINT_ERR_MSG(NGMSG_FILE_BLANK);
PRINT_FILE_NAME(file_name);
}
return FILE_CHK_NG;
}
return FILE_CHK_OK;
}
/*
* Whether on an ext4 filesystem
*/
int is_ext4(const char *filename)
{
struct statfs buffs;
char *mtab = MOUNTED; /* Refer to /etc/mtab */
struct mntent *mnt = NULL;
FILE *fp = NULL;
int maxlen, len;
char maxtype[10];
char fullpath[PATH_MAX];
/* Get full path */
if (realpath(filename, fullpath) == NULL) {
perror(NGMSG_REALPATH);
PRINT_FILE_NAME(filename);
return RETURN_NG;
}
if (statfs(fullpath, &buffs) < 0) {
perror(NGMSG_FS_INFO);
PRINT_FILE_NAME(filename);
return RETURN_NG;
}
if (buffs.f_type != EXT4_SUPER_MAGIC) {
PRINT_ERR_MSG(NGMSG_EXT4);
return RETURN_NG;
}
if ((fp = setmntent(mtab, "r")) == NULL) {
perror(NGMSG_MTAB);
return RETURN_NG;
}
maxlen = 0;
while ((mnt = getmntent(fp)) != NULL) {
len = strlen(mnt->mnt_dir);
if (memcmp(fullpath, mnt->mnt_dir, len) == 0) {
if (maxlen < len) {
maxlen = len;
strcpy(maxtype, mnt->mnt_type);
}
}
}
if (strcmp(maxtype, FS_EXT4) == 0) {
endmntent(fp);
return RETURN_OK;
} else {
endmntent(fp);
PRINT_ERR_MSG(NGMSG_EXT4);
return RETURN_NG;
}
}
/*
* Get device's mount point
*/
int get_mount_point(const char *devname, char *mount_point, int buf_len)
{
char *mtab = MOUNTED; /* Refer to /etc/mtab */
struct mntent *mnt = NULL;
FILE *fp = NULL;
if ((fp = setmntent(mtab, "r")) == NULL) {
perror(NGMSG_MTAB);
return RETURN_NG;
}
while ((mnt = getmntent(fp)) != NULL) {
if (strcmp(devname, mnt->mnt_fsname) == 0) {
endmntent(fp);
if (strcmp(mnt->mnt_type, FS_EXT4) == 0) {
strncpy(mount_point, mnt->mnt_dir, buf_len);
return RETURN_OK;
}
PRINT_ERR_MSG(NGMSG_EXT4);
return RETURN_NG;
}
}
endmntent(fp);
PRINT_ERR_MSG(NGMSG_UNMOUNT);
return RETURN_NG;
}
int main(int argc, char *argv[])
{
int i, flags;
int arg_type;
int success_flag;
int orig_detail;
char dir_name[PATH_MAX];
int fd;
int ret;
int c;
struct stat64 buf;
i = 1;
arg_type = -1;
success_flag = 0;
orig_detail = -1;
flags = 0;
flags |= FTW_PHYS; /* Do not follow symlink */
flags |= FTW_MOUNT; /* Stay within the same filesystem */
/* Parse arguments */
if (argc == 1 || (argc == 2 && argv[1][0] == '-')) {
printf(MSG_USAGE);
return 1;
}
while ((c = getopt(argc, argv, "rvf")) != EOF) {
switch (c) {
case 'r':
regional_flag = 1;
i = 2;
break;
case 'v':
detail_flag = 1;
i = 2;
break;
case 'f':
force_flag = 1;
i = 2;
if (argc == 4) {
int res_strlen;
res_strlen = strlen(argv[3]);
for (res_strlen -= 1; res_strlen >= 0;
res_strlen--) {
if (!isdigit(argv[3][res_strlen])) {
printf ("Illegal argument\n\n");
printf(MSG_USAGE);
exit(1);
}
}
fgoal = strtoul(argv[3], NULL, 0);
if (errno) {
printf ("block num shold be < 32bit\n");
exit(1);
}
}
if (!fgoal)
fgoal = -1;
break;
default:
printf(MSG_USAGE);
return 1;
}
}
/* Main process */
for (; i < argc; i++) {
amount_cnt = 0;
succeed_cnt = 0;
memset(dir_name, 0, PATH_MAX);
if (force_flag && i == 3)
break;
if (stat64(argv[i], &buf) < 0) {
perror(NGMSG_FILE_INFO);
PRINT_FILE_NAME(argv[i]);
continue;
}
/* Regular file is acceptalbe with force mode */
if (force_flag && !S_ISREG(buf.st_mode)) {
printf ("Inappropriate file type \n\n");
printf(MSG_USAGE);
exit(1);
}
/* Block device */
if (S_ISBLK(buf.st_mode)) {
arg_type = DEVNAME;
if (get_mount_point(argv[i], dir_name, PATH_MAX) ==
RETURN_NG) {
continue;
}
printf("Start defragment for device(%s)\n", argv[i]);
} else if (S_ISDIR(buf.st_mode)) {
/* Directory */
arg_type = DIRNAME;
if (access(argv[i], R_OK) < 0) {
perror(argv[i]);
continue;
}
strcpy(dir_name, argv[i]);
} else if (S_ISREG(buf.st_mode)) {
/* Regular file */
arg_type = FILENAME;
} else {
/* Irregular file */
PRINT_ERR_MSG(NGMSG_FILE_UNREG);
PRINT_FILE_NAME(argv[i]);
continue;
}
/* Device's ext4 check is in get_mount_point() */
if (arg_type == FILENAME || arg_type == DIRNAME) {
if (is_ext4(argv[i]) == RETURN_NG) {
continue;
}
}
switch (arg_type) {
case DIRNAME:
printf("Start defragment for directory(%s)\n",
argv[i]);
case DEVNAME:
/* Regional block allocation */
if (regional_flag) {
printf(MSG_R_OPTION);
if ((fd = open64(dir_name, O_RDONLY)) <
0) {
if (detail_flag) {
perror(NGMSG_FILE_OPEN);
PRINT_FILE_NAME(
dir_name);
}
continue;
}
goal = 0;
if ((ret = ioctl(fd, EXT4_IOC_FIBMAP,
&goal)) > 0) {
perror(NGMSG_FILE_FIBMAP);
PRINT_FILE_NAME(dir_name);
close(fd);
continue;
}
close(fd);
}
/* File tree walk */
nftw64(dir_name, ftw_fn, FTW_OPEN_FD, flags);
printf("\tTotal:\t\t%12d\n", amount_cnt);
printf("\tSuccess:\t%12d\n", succeed_cnt);
printf("\tFailure:\t%12d\n",
amount_cnt - succeed_cnt);
break;
case FILENAME:
if (regional_flag) {
fprintf(stderr, NGMSG_TYPE, argv[i]);
continue;
}
orig_detail = detail_flag;
detail_flag = 1;
printf("Start defragment for %s\n", argv[i]);
/* Single file process */
ftw_fn(argv[i], &buf, FTW_F, NULL);
if (succeed_cnt != 0) {
printf(
"\tSUCCESS\t:file defrag success.\n"
);
}
detail_flag = orig_detail;
break;
}
if (succeed_cnt != 0)
success_flag = 1;
}
if (success_flag)
return 0;
return 1;
}
/* Sequentially insert extent by physical block number */
int insertextent(extlist **head, extlist *ext)
{
extlist *p = *head;
if (ext == NULL) {
return RETURN_NG;
}
/* First element */
if (*head == NULL) {
(*head) = ext;
(*head)->prev = *head;
(*head)->next = *head;
return 0;
}
if (ext->data.start <= p->data.start) {
/* Insert before head */
if (p->data.start < ext->data.start + ext->data.len) {
/* Overlap */
return RETURN_NG;
}
/* Adjust head */
*head = ext;
} else {
/* Insert into the middle or last of the list */
p = *head;
do {
if (ext->data.start < p->data.start) {
break;
}
p = p->next;
} while (p != (*head));
if (ext->data.start < p->prev->data.start + p->prev->data.len) {
/* Overlap */
return RETURN_NG;
}
if (p != *head &&
p->data.start < ext->data.start + ext->data.len) {
/* Overlap */
return RETURN_NG;
}
}
p = p->prev;
/* Insert "ext" after "p" */
insert(p,ext);
return 0;
}
/* Insert big extent in decreasing order of length */
int insertbig(bigext **bighead, bigext *ext)
{
bigext *p = NULL;
if (ext == NULL) {
return RETURN_NG;
}
/* Initialize list */
if (*bighead == NULL) {
(*bighead) = ext;
(*bighead)->prev = *bighead;
(*bighead)->next = *bighead;
return 0;
}
if (ext->big_len >= (*bighead)->big_len) {
/* Insert before bighead */
p = (*bighead)->prev;
insert(p, ext);
*bighead = ext;
return 0;
}
/* Find insertion positon */
for (p = (*bighead)->next; p != *bighead; p = p->next) {
if (p->big_len < ext->big_len) {
break;
}
}
p = p->prev;
insert(p, ext);
return 0;
}
/* Delete and get element from the big list */
bigext * del_get_big(bigext **bighead, bigext *ext)
{
if (ext == NULL || *bighead == NULL) {
return NULL;
}
/* Keep "bighead" point to the largest enxtent */
if (ext == *bighead) {
*bighead = ext->next;
}
if (*bighead == (*bighead)->next && ext == *bighead) {
/* Delete the last element in the list */
*bighead = NULL;
}
ext->prev->next = ext->next;
ext->next->prev = ext->prev;
return ext;
}
void freebig(bigext *big)
{
bigext *tmpbig = NULL;
if (big == NULL) {
return;
}
while (big->next != big) {
tmpbig = big;
big->prev->next = big->next;
big->next->prev = big->prev;
big = big->next;
free(tmpbig);
}
free(big);
}
void free_ext(extlist *head)
{
extlist *tmp = NULL;
if (head == NULL) {
return;
}
while (head->next != head) {
tmp = head;
head->prev->next = head->next;
head->next->prev = head->prev;
head = head->next;
free(tmp);
}
free(head);
}
int move_wrap_tail(ext_wrap **from, ext_wrap **to, ext_wrap *entry)
{
if (!to || !entry) {
return RETURN_NG;
}
if (from && *from == entry) {
if ((*from)->next == *from) {
*from = NULL;
} else {
*from = (*from)->next;
}
}
entry->next->prev = entry->prev;
entry->prev->next = entry->next;
if (!(*to)) {
*to = entry;
(*to)->prev = (*to)->next = *to;
} else {
entry->next = *to;
entry->prev = (*to)->prev;
(*to)->prev->next = entry;
(*to)->prev = entry;
}
return 0;
}
void mark_wrap(ext_wrap *list)
{
ext_wrap *wrap = list;
if (!list) {
return;
}
do {
wrap->group_ext->tag |= EXT4_EXT_RESERVE;
wrap = wrap->next;
} while (wrap != list);
}
void free_wrap_list(ext_wrap **head)
{
ext_wrap *wrap, *tmp;
if (!head || !(*head)) {
return;
}
wrap = *head;
do {
tmp = wrap;
wrap = wrap->next;
free(tmp);
} while (wrap != *head);
*head = NULL;
}
int list_size(ext_wrap *list)
{
ext_wrap *entry = list;
int ret = 0;
if (!list) {
return 0;
}
do {
ret++;
entry = entry->next;
} while (entry != list);
return ret;
}
static inline
int do_defrag(int fd, bigext *bigptr, extlist *ptr0, struct ext4_ext_defrag_data defrag_data)
{
int defraged_size = 0;
int ret = 0;
/* Defrag */
defrag_data.ext.start = bigptr->start->data.start;
defrag_data.ext.len = bigptr->big_len;
defrag_data.ext.block = 0;
defrag_data.defrag_size = bigptr->big_len;
defrag_data.flag = DEFRAG_RESERVE_BLOCK_SECOND;
defrag_data.goal = bigptr->start->data.start;
defraged_size = ioctl(fd, EXT4_IOC_DEFRAG, &defrag_data);
if (defraged_size < 0) {
ret = RETURN_NG;
}
/* Release reserved sign */
ptr0 = bigptr->start;
do {
ptr0->tag &= ~EXT4_EXT_RESERVE;
ptr0 = ptr0->next;
} while (ptr0 != bigptr->end->next);
ret += defraged_size;
if(defraged_size > 0)
defrag_data.start_offset += defraged_size;
return ret;
}
int force_defrag(int fd, const struct stat64 *sb, int blocksize)
{
struct ext4_group_data_info ext4_group_data;
struct ext4_extents_info tmpext;
struct ext4_extent_data ext;
struct ext4_ext_defrag_data defrag_data;
bigext *bighead, *target_bighead, *bigptr;
extlist *head, *startptr, *ptr0;
ext_wrap *target_head, *wrap, *tmp_wrap_list;
ext4_fsblk_t bstart, bend;
unsigned long filesize;
unsigned long long ino, istart, iend;
unsigned int gn;
int len, maxlen;
int pos = 0;
int ret = 0;
int exts, file_exts;
memset(&ext4_group_data, 0, sizeof(struct ext4_group_data_info));
memset(&tmpext, 0, sizeof(struct ext4_extents_info));
memset(&defrag_data, 0, sizeof(struct ext4_ext_defrag_data));
memset(&ext, 0, sizeof(struct ext4_extent_data));
bigptr = target_bighead = bighead = NULL;
head = startptr = ptr0 = NULL;
target_head = wrap = tmp_wrap_list = NULL;
if (ioctl(fd, EXT4_IOC_GROUP_INFO, &ext4_group_data) < 0) {
return RETURN_NG;
}
gn = (sb->st_ino -1) / ext4_group_data.s_inodes_per_group;
istart = gn * ext4_group_data.s_inodes_per_group;
iend = istart + ext4_group_data.s_inodes_per_group - 1;
bstart = gn * ext4_group_data.s_blocks_per_group;
bend = bstart + ext4_group_data.s_blocks_per_group - 1;
/* Compute filesize in block */
filesize = (sb->st_size+ blocksize - 1) / blocksize;
/* Get used extent in the block group */
tmpext.max_entries = DEFRAG_MAX_ENT;
for (ino = istart; ino <= iend; ino++) {
tmpext.ino = ino;
tmpext.entries = 0;
pos = 0;
do {
/* Get extents info */
int j;
tmpext.entries += pos;/* Offset */
pos = tmpext.entries;
memset(tmpext.ext, 0,
sizeof(struct ext4_extent_data) * DEFRAG_MAX_ENT);
ret = ioctl(fd, EXT4_IOC_EXTENTS_INFO, &tmpext);
if (ret < 0) {
if (errno == ENOENT) {
continue;
} else {
/* without ENOENT case*/
ret = RETURN_NG;
goto freelist;
}
}
for (j = 0; j < tmpext.entries; j++) {
extlist *listptr = NULL;
/* Is this extent in current block group? */
if (tmpext.ext[j].start < bstart ||
tmpext.ext[j].start > bend) {
continue;
}
listptr = malloc(sizeof(extlist));
if (listptr == NULL) {
ret = RETURN_NG;
goto freelist;
}
memset(listptr, 0, sizeof(extlist));
memcpy(&(listptr->data), &tmpext.ext[j],
sizeof(struct ext4_extent_data));
listptr->ino = ino;
if (insertextent(&head, listptr) < 0) {
ret = RETURN_NG;
goto freelist;
}
}
} while (tmpext.entries == DEFRAG_MAX_ENT && ret == 0);
}
/* Get free extents in the group */
memset(&tmpext, 0, sizeof(struct ext4_extents_info));
tmpext.ino = sb->st_ino;
tmpext.max_entries = DEFRAG_MAX_ENT;
for (pos = 0; pos < ext4_group_data.s_blocks_per_group;)
{
int j;
if (ioctl(fd, EXT4_IOC_FREE_BLOCKS_INFO, &tmpext) < 0) {
ret = RETURN_NG;
goto freelist;
}
/*
* No free extent after the logical block number "pos".
* In other word, offset this time equals to prev recursion.
*/
for (j = 0; tmpext.ext[j].len != 0 && j < DEFRAG_MAX_ENT; j++) {
/* Alloc list node store extent */
extlist *listptr = NULL;
listptr = malloc(sizeof(extlist));
if (listptr == NULL) {
ret = RETURN_NG;
goto freelist;
}
memset(listptr, 0, sizeof(extlist));
memcpy(&(listptr->data), &(tmpext.ext[j]),
sizeof(struct ext4_extent_data));
listptr->tag = EXT4_EXT_FREE;/* Free extent */
if (insertextent(&head, listptr) < 0) {
ret = RETURN_NG;
goto freelist;
}
}
/*
* No free extent after the logical block number "pos".
* In other word, offset this time equals to prev recursion.
*/
if (pos == tmpext.offset) {
break;
}
if (j < DEFRAG_MAX_ENT) {
break;
}
/* Record the offset of logical block number this time */
pos = tmpext.offset;
memset(tmpext.ext, 0,
sizeof(struct ext4_extent_data) * DEFRAG_MAX_ENT);
}
/* All space in this group is used by other groups' inodes */
if (head == NULL) {
ret = RETURN_NG;
goto freelist;
}
/* Find continuous region(big extent) */
startptr = ptr0 = head;
maxlen = 0;
len = head->data.len;
ptr0 = ptr0->next;
do {
if (len >= filesize) {
/* Hit on the way */
bigext *bigtmp = malloc(sizeof(bigext));
if (!bigtmp) {
ret = RETURN_NG;
goto freelist;
}
bigtmp->prev = bigtmp->next = NULL;
bigtmp->start = startptr;
bigtmp->end = ptr0->prev;
bigtmp->big_len = len;
if (insertbig(&target_bighead, bigtmp) < 0) {
ret = RETURN_NG;
goto freelist;
}
maxlen += len;
exts = 1;
goto frag_check;
}
if ((ptr0->prev->data.start + ptr0->prev->data.len) !=
ptr0->data.start) {
bigext *bigtmp = NULL;
bigtmp = malloc(sizeof(bigext));
if (bigtmp == NULL) {
ret = RETURN_NG;
goto freelist;
}
memset(bigtmp, 0, sizeof(bigext));
bigtmp->big_len = len;
bigtmp->start = startptr;
bigtmp->end = ptr0->prev;
if (insertbig(&bighead, bigtmp) < 0) {
ret = RETURN_NG;
goto freelist;
}
maxlen += len;
startptr = ptr0;
len = ptr0->data.len;
ptr0 = ptr0->next;
continue;
}
len += ptr0->data.len;
ptr0 = ptr0->next;
} while (ptr0 != head->next);
if (maxlen < filesize) {
/* No enough space */
errno = ENOSPC;
ret = RETURN_NG;
goto freelist;
}
if (!bighead) {
ret = RETURN_NG;
goto freelist;
}
len = 0;/* Blocks we found for target file */
exts = 0;/* Extents we found for target file */
while (bighead)
{
bigext *bigtmp;
if (bighead->big_len + len >= filesize) {
/*
* Search from the smallest big-extent
* to avoid waste of space
*/
bigtmp = bighead->prev;
do {
if (bigtmp->big_len + len >= filesize) {
len += bigtmp->big_len;
bigtmp = del_get_big(&bighead, bigtmp);
if (insertbig(&target_bighead, bigtmp) <
0) {
ret = RETURN_NG;
goto freelist;
}
exts++;
goto frag_check;
}
bigtmp = bigtmp->prev;
} while (bigtmp != bighead->prev);
}
len += bighead->big_len;
bigtmp = del_get_big(&bighead, bighead);
if (insertbig(&target_bighead, bigtmp) < 0) {
ret = RETURN_NG;
goto freelist;
}
exts++;
}
if (!bighead) {
ret = RETURN_NG;
goto freelist;
}
frag_check:
/* Count file exts */
memset(&tmpext, 0, sizeof(struct ext4_extents_info));
file_exts = 0;/* Extents count of file */
tmpext.ino = sb->st_ino;
tmpext.max_entries = DEFRAG_MAX_ENT;
tmpext.entries = 0;
pos = 0;
do {
tmpext.entries += pos;
pos = tmpext.entries;
ret = ioctl(fd, EXT4_IOC_EXTENTS_INFO, &tmpext);
if (ret < 0) {
ret = RETURN_NG;
goto freelist;
}
file_exts += tmpext.entries;
} while (tmpext.entries == DEFRAG_MAX_ENT && ret == 0);
if (exts >= file_exts) {
/* No improvment */
ret = RETURN_NG;
goto freelist;
}
/* Reserve free extents */
if (!target_bighead) {
/* Fault */
ret = RETURN_NG;
goto freelist;
}
bigptr = target_bighead;
memset(&tmpext, 0, sizeof(tmpext));
tmpext.ino = 0;
tmpext.max_entries = DEFRAG_MAX_ENT;
tmpext.ino = sb->st_ino;
tmp_wrap_list = NULL;
ext4_fsblk_t data_block = 0;
ext4_fsblk_t data_start = 0;
int data_len = 0;
defrag_data.start_offset = 0;
do {
ext_wrap *wrap;
ptr0 = bigptr->start;
data_len = 0;
data_start = ptr0->data.start;
data_block = ptr0->data.block;
do {
data_len += ptr0->data.len;
if (ptr0->tag != EXT4_EXT_USE) {
ptr0->tag = EXT4_EXT_RESERVE;
ptr0 = ptr0->next;
continue;
}
tmpext.ino = ptr0->ino;
tmpext.goal = fgoal;
memcpy(tmpext.ext, &ptr0->data,
sizeof(struct ext4_extent_data));
wrap = malloc(sizeof(ext_wrap));
if (!wrap) {
ret = RETURN_NG;
goto release_blocks;
}
wrap->group_ext = ptr0;
wrap->next = wrap->prev = wrap;
if (move_wrap_tail(NULL, &tmp_wrap_list, wrap) < 0) {
ret = RETURN_NG;
goto release_blocks;
}
ptr0 = ptr0->next;
tmpext.entries = 1;
ret = ioctl(fd, EXT4_IOC_MOVE_VICTIM, &tmpext);
if (ret < 0) {
ret = RETURN_NG;
goto release_blocks;
}
mark_wrap(tmp_wrap_list);
free_wrap_list(&tmp_wrap_list);
} while (ptr0 != bigptr->end->next);
if (fsync(fd) < 0) {
if (detail_flag) {
perror(NGMSG_FILE_SYNC);
}
close(fd);
goto freelist;
}
tmpext.entries = 1;
tmpext.ext[0].block = data_block;
tmpext.ext[0].start = data_start;
tmpext.ext[0].len = bigptr->big_len;
ret = ioctl(fd, EXT4_IOC_RESERVE_BLOCK, &tmpext);
if (ret < 0) {
printf("RESERVE_ERROR ret = %d\n", ret);
goto release_blocks;
}
ret = do_defrag(fd, bigptr, ptr0, defrag_data);
if (ret < 0) {
printf("DEFRAG_ERROR ret = %d\n", ret);
goto release_blocks;
}
defrag_data.start_offset += ret;
ret = defrag_data.start_offset;
bigptr = bigptr->next;
} while (bigptr != target_bighead);
goto freelist;
release_blocks:
ret = ioctl(fd, EXT4_IOC_BLOCK_RELEASE);
if (ret < 0) {
ret = RETURN_NG;
goto freelist;
}
freelist:
free_wrap_list(&target_head);
free_wrap_list(&tmp_wrap_list);
freebig(target_bighead);
freebig(bighead);
free_ext(head);
return ret;
}
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