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Message-Id: <200712271112.AA00290@TNESG9526.rs.jp.nec.com>
Date: Thu, 27 Dec 2007 20:12:02 +0900
From: Akira Fujita <a-fujita@...jp.nec.com>
To: linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: [RFC][PATCH 5/5] ext4 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
#define _GNU_SOURCE
#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>
#include <sys/syscall.h>
#include <sys/mman.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 DEFRAG_MAX_ENT 32
/* Extent status which are used in extent_t */
#define EXT4_EXT_USE 0
#define EXT4_EXT_FREE 1
#define EXT4_EXT_RESERVE 2
/* Insert list2 after list1 */
#define insert(list1, list2) \
do { \
list2->next = list1->next; \
list1->next->prev = list2; \
list2->prev = list1; \
list1->next = list2; \
} while (0)
#define DEFRAG_FORCE_VICTIM 2
/* Magic number for ext4 */
#define EXT4_SUPER_MAGIC 0xEF53
/* Force defrag mode: Max file size in bytes (128MB) */
#define MAX_FILE_SIZE (unsigned long)1 << 27
/* 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)
#ifndef __NR_fadvise64
#define __NR_fadvise64 250
#endif
#ifndef __NR_sync_file_range
#define __NR_sync_file_range 314
#endif
#ifndef POSIX_FADV_DONTNEED
#if defined(__s390x__)
#define POSIX_FADV_DONTNEED 6 /* Don't need these pages. */
#else
#define POSIX_FADV_DONTNEED 4 /* Don't need these pages. */
#endif
#endif
#ifndef SYNC_FILE_RANGE_WAIT_BEFORE
#define SYNC_FILE_RANGE_WAIT_BEFORE 1
#endif
#ifndef SYNC_FILE_RANGE_WRITE
#define SYNC_FILE_RANGE_WRITE 2
#endif
#ifndef SYNC_FILE_RANGE_WAIT_AFTER
#define SYNC_FILE_RANGE_WAIT_AFTER 4
#endif
#define DEVNAME 0
#define DIRNAME 1
#define FILENAME 2
#define RETURN_OK 0
#define RETURN_NG -1
#define FTW_CONT 0
#define FTW_OPEN_FD 2000
#define FILE_CHK_OK 0
#define FILE_CHK_NG -1
#define FS_EXT4 "ext4dev"
#define ROOT_UID 0
#define CHECK_FRAG_COUNT 1
/* 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."
#define NGMSG_FILE_MAP "\te4defrag : get file map fail."
#define NGMSG_FILE_DROP_BUFFER "\te4defrag : free page fail."
#define NGMSG_FADVISE_SYSCALL "\tfadvise fail."
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 extent {
struct extent *prev;
unsigned long tag; /* Extent status */
unsigned long ino; /* File's inode number */
struct ext4_extent_data data; /* Extent belong to file */
struct extent *next;
} extent_t;
typedef struct exts_group {
struct exts_group *prev;
extent_t *start; /* Start ext */
extent_t *end; /* End ext */
int len; /* Length of this continuous region */
struct exts_group *next;
} exts_group_t;
typedef struct extent_wrap {
struct extent_wrap *prev, *next;
struct extent *group_ext;
} extent_wrap_t;
int force_flag;
int detail_flag;
int regional_flag;
int amount_cnt;
int succeed_cnt;
ext4_fsblk_t goal;
ext4_fsblk_t fgoal = -1;
/**
* fadvise() - advise operater system process page cache.
*
* @fd: file descriptor.
* @offset: file offset.
* @len: area length.
* @advise: process flag.
*/
int fadvise(int fd, loff_t offset, size_t len, int advise)
{
return syscall(__NR_fadvise64, fd, offset, len, advise);
}
/**
* sync_file_range() - sync file region.
*
* @fd: file descriptor.
* @offset: file offset.
* @length: area length.
* @advise: process flag.
*/
int sync_file_range(int fd, loff_t offset, loff_t length, unsigned int flag)
{
return syscall(__NR_sync_file_range, fd, offset, length, flag);
}
/**
* page_in_core() - get information on whether pages are in core.
*
* @fd: file descriptor.
* @defrag_data: data used for defrag.
* @vec: page state array.
* @page_num: page number.
*/
int page_in_core(int fd, struct ext4_ext_defrag_data defrag_data,
unsigned char **vec, unsigned long *page_num)
{
int blocksize;
int pagesize = getpagesize();
void *page = NULL;
loff_t offset, end_offset, length;
if (vec == NULL || *vec != NULL) {
return RETURN_NG;
}
if (ioctl(fd, FIGETBSZ, &blocksize) < 0) {
return RETURN_NG;
}
/*in mmap, offset should be a multiple of the page size */
offset = defrag_data.start_offset * blocksize;
length = defrag_data.defrag_size * blocksize;
end_offset = offset + length;
/* round the offset down to the nearest multiple of pagesize */
offset = (offset / pagesize) * pagesize;
length = end_offset - offset;
page = mmap(NULL, length, PROT_READ, MAP_SHARED, fd, offset);
if (page == MAP_FAILED) {
return RETURN_NG;
}
*page_num = 0;
*page_num = (length + pagesize - 1) / pagesize;
*vec = (unsigned char *)calloc(*page_num, 1);
if (*vec == NULL) {
return RETURN_NG;
}
/* get information on whether pages are in core */
if (mincore(page, (size_t)length, *vec) == -1) {
if (*vec) {
free(*vec);
}
return RETURN_NG;
}
if (munmap(page, length) == -1) {
if (*vec) {
free(*vec);
}
return RETURN_NG;
}
return RETURN_OK;
}
/**
* defrag_fadvise() - predeclare an access pattern for file data.
*
* @fd: file descriptor.
* @defrag_data: data used for defrag.
* @vec: page state array.
* @page_num: page number.
*/
int defrag_fadvise(int fd, struct ext4_ext_defrag_data defrag_data,
unsigned char *vec, unsigned long page_num)
{
int flag = 1;
int blocksize;
int pagesize = getpagesize();
int fadvise_flag = POSIX_FADV_DONTNEED;
int sync_flag = SYNC_FILE_RANGE_WAIT_BEFORE | SYNC_FILE_RANGE_WRITE|
SYNC_FILE_RANGE_WAIT_AFTER;
unsigned long i;
loff_t offset;
if (ioctl(fd, FIGETBSZ, &blocksize) < 0) {
return RETURN_NG;
}
offset = (loff_t)defrag_data.start_offset * blocksize;
offset = (offset / pagesize) * pagesize;
/* sync file for fadvise process */
if (sync_file_range(fd, offset, (loff_t)pagesize*page_num, sync_flag)
!= 0) {
return RETURN_NG;
}
/* try to release buffer cache this process used,
* then other process can use the released buffer */
for (i = 0; i < page_num; i++) {
if ((vec[i] & 0x1) == 0) {
offset += pagesize;
continue;
}
if (fadvise(fd, offset, pagesize, fadvise_flag) != 0) {
if (detail_flag && flag) {
perror(NGMSG_FADVISE_SYSCALL);
flag = 0;
}
}
offset += pagesize;
}
return RETURN_OK;
}
/**
* check_free_size() - Check if there's enough disk space.
*
* @fd: the file's descriptor.
* @buf: the pointer of the struct stat64.
*/
int check_free_size(int fd, const struct stat64 *buf)
{
off64_t size = 0;
off64_t free_size = 0;
struct statfs fsbuf;
/* target file size */
size = buf->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) {
free_size = (off64_t)fsbuf.f_bsize * fsbuf.f_bfree;
} else {
free_size = (off64_t)fsbuf.f_bsize * fsbuf.f_bavail;
}
if (free_size >= size) {
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 *buf, int blocksize);
/**
* ftw_fn() - Check file attributes and ioctl call to avoid
* illegal operations.
*
* @file: the file's name.
* @buf: the pointer of the struct stat64.
* @flag: file type.
* @ftwbuf: the pointer of a struct FTW.
*/
int
ftw_fn(const char *file, const struct stat64 *buf, int flag, struct FTW *ftwbuf)
{
int fd;
int blocksize;
int percent = 0;
int defraged_size = 0;
int ret = RETURN_NG;
int pos, file_frags_start, file_frags_end;
unsigned long page_num;
unsigned char *vec = NULL;
loff_t start = 0;
struct ext4_ext_defrag_data df_data;
struct ext4_extents_info extents_info;
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, buf, 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);
}
close(fd);
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;
/* count file frags before defrag if detail_flag set */
if (detail_flag) {
pos = 0;
file_frags_start = 0;
memset(&extents_info, 0,
sizeof(struct ext4_extents_info));
extents_info.ino = buf->st_ino;
extents_info.max_entries = DEFRAG_MAX_ENT;
extents_info.entries = 0;
do {
extents_info.entries += pos;
pos = extents_info.entries;
ret = ioctl(fd, EXT4_IOC_EXTENTS_INFO,
&extents_info);
if (ret < 0) {
perror(NGMSG_FILE_INFO);
PRINT_FILE_NAME(file);
close(fd);
return FTW_CONT;
}
file_frags_start += extents_info.entries;
} while (extents_info.entries == DEFRAG_MAX_ENT &&
ret == 0);
}
/* print process progress */
printf("\tprocessing -------> %s:\n", file);
percent = (start * 100) / buf->st_size;
printf("\033[79;16H\033[K progressing ====> %d%%", percent);
fflush(stdout);
while (1) {
df_data.defrag_size =
(min((buf->st_size - start),
DEFRAG_SIZE) + blocksize - 1) /
blocksize;
ret = page_in_core(fd, df_data, &vec, &page_num);
if (ret == RETURN_NG) {
if (detail_flag) {
perror(NGMSG_FILE_MAP);
PRINT_FILE_NAME(file);
} else {
printf("\n");
}
close(fd);
return FTW_CONT;
}
/* EXT4_IOC_DEFRAG */
defraged_size = ioctl(fd, EXT4_IOC_DEFRAG, &df_data);
/* free page */
ret = defrag_fadvise(fd, df_data, vec, page_num);
if (vec) {
free(vec);
vec = NULL;
}
if (ret == RETURN_NG) {
if (detail_flag) {
perror(NGMSG_FILE_DROP_BUFFER);
PRINT_FILE_NAME(file);
} else {
printf("\n");
}
close(fd);
return FTW_CONT;
}
if ((defraged_size < 0) && (force_flag == 1) &&
(errno == ENOSPC) && buf->st_size <= MAX_FILE_SIZE) {
defraged_size = force_defrag(fd, buf,
blocksize);
if (defraged_size * blocksize >= buf->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);
} else {
printf("\n");
}
close(fd);
return FTW_CONT;
}
df_data.start_offset += defraged_size;
start = df_data.start_offset * blocksize;
/* print process progress */
if (start > ((long long)1 << 56)) {
/* consider overflow("start * 100" beyond 64bits) */
start = start >> 8;
percent = (start * 100) / (buf->st_size >> 8);
} else {
percent = (start * 100) / buf->st_size;
}
/* disk space file used is bigger than logical size */
if (percent > 100) {
percent = 100;
}
printf("\033[79;16H\033[K progressing ====> %d%%",
percent);
fflush(stdout);
/* End of file */
if (start >= buf->st_size) {
break;
}
}
/* count file frags after defrag and print extents info */
if (detail_flag) {
pos = 0;
ret = RETURN_NG;
file_frags_end = 0;
extents_info.entries = 0;
do {
extents_info.entries += pos;
pos = extents_info.entries;
ret = ioctl(fd, EXT4_IOC_EXTENTS_INFO,
&extents_info);
if (ret < 0) {
printf("\n");
perror(NGMSG_FILE_INFO);
PRINT_FILE_NAME(file);
close(fd);
return FTW_CONT;
}
file_frags_end += extents_info.entries;
} while (extents_info.entries == DEFRAG_MAX_ENT &&
ret == 0);
printf("\n\t\textents: %d ==> %d",
file_frags_start, file_frags_end);
}
printf("\n");
close(fd);
succeed_cnt++;
} else {
if (detail_flag) {
PRINT_ERR_MSG(NGMSG_FILE_UNREG);
PRINT_FILE_NAME(file);
}
}
return FTW_CONT;
}
/**
* file_check() - Check file's attributes.
*
* @fd: the file's descriptor.
* @buf: a pointer of the struct stat64.
* @file_name: the file's name.
*/
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;
}
/* Free 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;
}
/**
* is_ext4() - Whether on an ext4 filesystem.
*
* @filename: the file's name.
*/
int is_ext4(const char *filename)
{
int maxlen, len;
FILE *fp = NULL;
char *mnt_type = NULL;
char *mtab = MOUNTED; /* Refer to /etc/mtab */
char file_path[PATH_MAX];
struct mntent *mnt = NULL;
struct statfs buffs;
/* Get full path */
if (realpath(filename, file_path) == NULL) {
perror(NGMSG_REALPATH);
PRINT_FILE_NAME(filename);
return RETURN_NG;
}
if (statfs(file_path, &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(file_path, mnt->mnt_dir, len) == 0) {
if (maxlen < len) {
maxlen = len;
mnt_type = realloc(mnt_type,
strlen(mnt->mnt_type) + 1);
if (!mnt_type) {
endmntent(fp);
return RETURN_NG;
}
strcpy(mnt_type, mnt->mnt_type);
}
}
}
if (strcmp(mnt_type, FS_EXT4) == 0) {
endmntent(fp);
if (mnt_type) {
free(mnt_type);
}
return RETURN_OK;
} else {
endmntent(fp);
if (mnt_type) {
free(mnt_type);
}
PRINT_ERR_MSG(NGMSG_EXT4);
return RETURN_NG;
}
}
/**
* get_mount_point() - Get device's mount point.
*
* @devname: the device's name.
* @mount_point: the mount point.
* @dir_path_len: the length of directory.
*/
int get_mount_point(const char *devname, char *mount_point, int dir_path_len)
{
char *mtab = MOUNTED; /* Refer to /etc/mtab */
FILE *fp = NULL;
struct mntent *mnt = 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,
dir_path_len);
return RETURN_OK;
}
PRINT_ERR_MSG(NGMSG_EXT4);
return RETURN_NG;
}
}
endmntent(fp);
PRINT_ERR_MSG(NGMSG_UNMOUNT);
return RETURN_NG;
}
/**
* main() - ext4 online defrag.
*
* @argc: the number of parameter.
* @argv[]: the pointer array of parameter.
*/
int main(int argc, char *argv[])
{
int fd;
int ret;
int opt;
int i, flags;
int arg_type;
int detail_tmp;
int success_flag;
char dir_name[PATH_MAX];
struct stat64 buf;
i = 1;
flags = 0;
arg_type = -1;
detail_tmp = -1;
success_flag = 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);
exit(1);
}
while ((opt = getopt(argc, argv, "rvf")) != EOF) {
switch (opt) {
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) {
printf("Illegal argument\n\n");
printf(MSG_USAGE);
exit(1);
}
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);
exit(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 (lstat64(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;
}
detail_tmp = 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 = detail_tmp;
break;
}
if (succeed_cnt != 0)
success_flag = 1;
}
if (success_flag)
return RETURN_OK;
exit(1);
}
/**
* insert_extent() - Sequentially insert extent by physical block number.
*
* @extlist_head: the head of an extent list.
* @ext: the extent element which will be inserted.
*/
int insert_extent(extent_t **extlist_head, extent_t *ext)
{
extent_t *ext_tmp = *extlist_head;
if (ext == NULL) {
return RETURN_NG;
}
/* First element */
if (*extlist_head == NULL) {
(*extlist_head) = ext;
(*extlist_head)->prev = *extlist_head;
(*extlist_head)->next = *extlist_head;
return RETURN_OK;
}
if (ext->data.start <= ext_tmp->data.start) {
/* Insert before head */
if (ext_tmp->data.start < ext->data.start + ext->data.len) {
/* Overlap */
return RETURN_NG;
}
/* Adjust head */
*extlist_head = ext;
} else {
/* Insert into the middle or last of the list */
do {
if (ext->data.start < ext_tmp->data.start) {
break;
}
ext_tmp = ext_tmp->next;
} while (ext_tmp != (*extlist_head));
if (ext->data.start <
ext_tmp->prev->data.start + ext_tmp->prev->data.len) {
/* Overlap */
return RETURN_NG;
}
if (ext_tmp != *extlist_head &&
ext_tmp->data.start < ext->data.start + ext->data.len) {
/* Overlap */
return RETURN_NG;
}
}
ext_tmp = ext_tmp->prev;
/* Insert "ext" after "ext_tmp" */
insert(ext_tmp, ext);
return RETURN_OK;
}
/**
* insert_exts_group() - Insert a exts_group in decreasing order of length.
*
* @exts_group_list_head: the head of a exts_group list.
* @exts_group: the exts_group element which will be inserted.
*/
int insert_exts_group(exts_group_t **exts_group_list_head,
exts_group_t *exts_group)
{
exts_group_t *exts_group_tmp = NULL;
if (exts_group == NULL) {
return RETURN_NG;
}
/* Initialize list */
if (*exts_group_list_head == NULL) {
(*exts_group_list_head) = exts_group;
(*exts_group_list_head)->prev = *exts_group_list_head;
(*exts_group_list_head)->next = *exts_group_list_head;
return RETURN_OK;
}
if (exts_group->len >= (*exts_group_list_head)->len) {
/* Insert before exts_group_list_head */
exts_group_tmp = (*exts_group_list_head)->prev;
insert(exts_group_tmp, exts_group);
*exts_group_list_head = exts_group;
return RETURN_OK;
}
/* Find insertion positon */
for (exts_group_tmp = (*exts_group_list_head)->next;
exts_group_tmp != *exts_group_list_head;
exts_group_tmp = exts_group_tmp->next) {
if (exts_group_tmp->len < exts_group->len) {
break;
}
}
exts_group_tmp = exts_group_tmp->prev;
insert(exts_group_tmp, exts_group);
return RETURN_OK;
}
/**
* get_exts_group() - Get element from the exts_group list.
*
* @exts_group_list_head: the head of a exts_group list.
* @exts_group: the exts_group element which will be geted.
*/
exts_group_t *get_exts_group(exts_group_t **exts_group_list_head,
exts_group_t *exts_group)
{
if (exts_group == NULL || *exts_group_list_head == NULL) {
return NULL;
}
/* Keep "exts_group_list_head" point to the largest extent group*/
if (exts_group == *exts_group_list_head) {
*exts_group_list_head = exts_group->next;
}
if (*exts_group_list_head == (*exts_group_list_head)->next &&
exts_group == *exts_group_list_head) {
/* Delete the last element in the list */
*exts_group_list_head = NULL;
}
exts_group->prev->next = exts_group->next;
exts_group->next->prev = exts_group->prev;
return exts_group;
}
/**
* free_exts_group() - Free the exts_group.
*
* @*exts_group_list_head: the exts_group list head which will be free.
*/
void free_exts_group(exts_group_t *exts_group_list_head)
{
exts_group_t *exts_group_tmp = NULL;
if (exts_group_list_head == NULL) {
return;
}
while (exts_group_list_head->next != exts_group_list_head) {
exts_group_tmp = exts_group_list_head;
exts_group_list_head->prev->next = exts_group_list_head->next;
exts_group_list_head->next->prev = exts_group_list_head->prev;
exts_group_list_head = exts_group_list_head->next;
free(exts_group_tmp);
}
free(exts_group_list_head);
}
/**
* free_ext() - Free the extent list.
*
* @extent_list_head: the extent list head of which will be free.
*/
void free_ext(extent_t *extent_list_head)
{
extent_t *extent_tmp = NULL;
if (extent_list_head == NULL) {
return;
}
while (extent_list_head->next != extent_list_head) {
extent_tmp = extent_list_head;
extent_list_head->prev->next = extent_list_head->next;
extent_list_head->next->prev = extent_list_head->prev;
extent_list_head = extent_list_head->next;
free(extent_tmp);
}
free(extent_list_head);
}
/**
* move_wrap() - Move a ext_wrap from one list to another.
*
* @from: the list which will be moved from.
* @to: the list which will be moved to.
* @entry: the ext_wrap which will be moved.
*/
int move_wrap(extent_wrap_t **from, extent_wrap_t **to,
extent_wrap_t *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 RETURN_OK;
}
/**
* mark_wrap() - Mark extent status as "EXT4_EXT_RESERVE".
*
* @ext_wrap_list: the ext_wrap list which will be marked.
*/
void mark_wrap(extent_wrap_t *ext_wrap_list)
{
extent_wrap_t *wrap = ext_wrap_list;
if (!ext_wrap_list) {
return;
}
do {
wrap->group_ext->tag |= EXT4_EXT_RESERVE;
wrap = wrap->next;
} while (wrap != ext_wrap_list);
}
/**
* free_wrap_list() - Free the ext_wrap list.
*
* @ext_wrap_head: the ext_wrap list head which will be free.
*/
void free_wrap_list(extent_wrap_t **ext_wrap_head)
{
extent_wrap_t *wrap, *ext_wrap_tmp;
if (!ext_wrap_head || !(*ext_wrap_head)) {
return;
}
wrap = *ext_wrap_head;
do {
ext_wrap_tmp = wrap;
wrap = wrap->next;
free(ext_wrap_tmp);
} while (wrap != *ext_wrap_head);
*ext_wrap_head = NULL;
}
/**
* do_defrag() - Execute the defrag program.
*
* @fd: the file's descriptor.
* @exts_group: the exts_group which will be defraged.
* @defrag_data: the data which will be defraged.
*/
static inline int do_defrag(int fd, exts_group_t *exts_group,
struct ext4_ext_defrag_data defrag_data)
{
int ret = 0;
int defraged_size = 0;
int fadvise_ret = 0;
unsigned long page_num;
unsigned char *vec = NULL;
extent_t *extent = NULL;
/* Defrag */
defrag_data.ext.start = exts_group->start->data.start;
defrag_data.ext.len = exts_group->len;
defrag_data.ext.block = 0;
defrag_data.defrag_size = exts_group->len;
defrag_data.flag = DEFRAG_FORCE_VICTIM;
defrag_data.goal = exts_group->start->data.start;
if (page_in_core(fd, defrag_data, &vec, &page_num) == RETURN_NG) {
return RETURN_NG;
}
defraged_size = ioctl(fd, EXT4_IOC_DEFRAG, &defrag_data);
/* free pages */
fadvise_ret = defrag_fadvise(fd, defrag_data, vec, page_num);
if (vec) {
free(vec);
}
if (fadvise_ret == RETURN_NG || defraged_size < 0) {
return RETURN_NG;
}
/* Release reserved sign */
extent = exts_group->start;
do {
extent->tag &= ~EXT4_EXT_RESERVE;
extent = extent->next;
} while (extent != exts_group->end->next);
ret += defraged_size;
return ret;
}
/**
* get_used_extent() - Get used extent in the block group.
*
* @fd: the file's descriptor.
* @ext_list_head: the head of the extent list.
* @istart: the start of the inode.
* @iend: the end of the inode.
* @bstart: the start of the block.
* @bend: the end of the block.
*/
int get_used_extent(int fd, extent_t **ext_list_head,
unsigned long long istart, unsigned long long iend,
unsigned long long bstart, unsigned long long bend)
{
int pos = 0;
int ret = 0;
unsigned long long inode;
struct ext4_extents_info extents_info;
memset(&extents_info, 0, sizeof(struct ext4_extents_info));
extents_info.max_entries = DEFRAG_MAX_ENT;
for (inode = istart; inode <= iend; inode++) {
extents_info.ino = inode;
extents_info.entries = 0;
pos = 0;
do {
/* Get extents info */
int i;
extents_info.entries += pos;/* Offset */
pos = extents_info.entries;
memset(extents_info.ext, 0,
sizeof(struct ext4_extent_data) *
DEFRAG_MAX_ENT);
ret = ioctl(fd, EXT4_IOC_EXTENTS_INFO, &extents_info);
if (ret < 0) {
if (errno == ENOENT) {
continue;
} else {
/* Without ENOENT case*/
return RETURN_NG;
}
}
for (i = 0; i < extents_info.entries; i++) {
extent_t *extent = NULL;
/* Is this extent in current block group? */
if (extents_info.ext[i].start < bstart ||
extents_info.ext[i].start > bend) {
continue;
}
extent = malloc(sizeof(extent_t));
if (extent == NULL) {
return RETURN_NG;
}
memset(extent, 0, sizeof(extent_t));
memcpy(&(extent->data), &extents_info.ext[i],
sizeof(struct ext4_extent_data));
extent->ino = inode;
if (insert_extent(ext_list_head, extent) < 0) {
if (extent) {
free(extent);
}
return RETURN_NG;
}
}
} while (extents_info.entries == DEFRAG_MAX_ENT && ret == 0);
}
if (ret < 0) {
if (errno == ENOENT) {
return RETURN_OK;
}
}
return ret;
}
/**
* get_free_extent() - Get used extent in the block group.
*
* @fd: the file's descriptor.
* @inode: inode number from struct stat64.
* @blocks_per_group: the block number of each block group.
* @ext_list_head: the head of the extent list.
*/
int get_free_extent(int fd, unsigned long long inode,
int blocks_per_group, extent_t **ext_list_head)
{
int pos = 0;
struct ext4_extents_info extents_info;
memset(&extents_info, 0, sizeof(struct ext4_extents_info));
extents_info.ino = inode;
extents_info.max_entries = DEFRAG_MAX_ENT;
while (pos < blocks_per_group) {
int i;
if (ioctl(fd, EXT4_IOC_FREE_BLOCKS_INFO, &extents_info) < 0) {
return RETURN_NG;
}
/*
* No free extent after the logical block number "pos".
* In other word, offset this time equals to prev recursion.
*/
for (i = 0;
extents_info.ext[i].len != 0 && i < DEFRAG_MAX_ENT; i++) {
/* Alloc list node store extent */
extent_t *extent = NULL;
extent = malloc(sizeof(extent_t));
if (extent == NULL) {
return RETURN_NG;
}
memset(extent, 0, sizeof(extent_t));
memcpy(&(extent->data), &(extents_info.ext[i]),
sizeof(struct ext4_extent_data));
extent->tag = EXT4_EXT_FREE;/* Free extent */
if (insert_extent(ext_list_head, extent) < 0) {
if (extent) {
free(extent);
}
return RETURN_NG;
}
}
/*
* No free extent after the logical block number "pos".
* In other word, offset this time equals to prev recursion.
*/
if (pos == extents_info.offset) {
break;
}
if (i < DEFRAG_MAX_ENT) {
break;
}
/* Record the offset of logical block number this time */
pos = extents_info.offset;
memset(extents_info.ext, 0,
sizeof(struct ext4_extent_data) * DEFRAG_MAX_ENT);
}
return RETURN_OK;
}
/**
* join_extents() - Find continuous region(exts_group).
*
* @ext_list_head: the head of the extent list.
* @target_exts_group_list_head:the head of the target exts_group list.
* @exts_group_list_head: the head of the original exts_group list.
* @filesize: the file's descriptor.
* @max: the max size of free space.
*/
int join_extents(extent_t *ext_list_head,
exts_group_t **target_exts_group_list_head,
exts_group_t **exts_group_list_head,
unsigned long filesize, int *max)
{
int len;
extent_t *ext_start, *extent_tmp;
ext_start = extent_tmp = ext_list_head;
*max = 0;
len = ext_list_head->data.len;
extent_tmp = extent_tmp->next;
do {
if (len >= filesize) {
/*
* Hit on the way,
* one extent group is enough for defrag, so return.
*/
exts_group_t *exts_group_tmp = NULL;
exts_group_tmp = malloc(sizeof(exts_group_t));
if (!exts_group_tmp) {
return RETURN_NG;
}
exts_group_tmp->prev = exts_group_tmp->next = NULL;
exts_group_tmp->start = ext_start;
exts_group_tmp->end = extent_tmp->prev;
exts_group_tmp->len = len;
if (insert_exts_group(target_exts_group_list_head,
exts_group_tmp) < 0) {
if (exts_group_tmp) {
free(exts_group_tmp);
}
return RETURN_NG;
}
return CHECK_FRAG_COUNT;
}
/*
* This extent and previous extent is not continuous,
* so, all previous extents is treated as an extent group.
*/
if ((extent_tmp->prev->data.start + extent_tmp->prev->data.len)
!= extent_tmp->data.start) {
exts_group_t *exts_group_tmp = NULL;
exts_group_tmp = malloc(sizeof(exts_group_t));
if (exts_group_tmp == NULL) {
return RETURN_NG;
}
memset(exts_group_tmp, 0, sizeof(exts_group_t));
exts_group_tmp->len = len;
exts_group_tmp->start = ext_start;
exts_group_tmp->end = extent_tmp->prev;
if (insert_exts_group(exts_group_list_head,
exts_group_tmp) < 0) {
if (exts_group_tmp) {
free(exts_group_tmp);
}
return RETURN_NG;
}
*max += len;
ext_start = extent_tmp;
len = extent_tmp->data.len;
extent_tmp = extent_tmp->next;
continue;
}
/*
* This extent and previous extent is continuous,
* so, they belong to the same extent group, and we check
* if the next extent belong to the same extent group.
*/
len += extent_tmp->data.len;
extent_tmp = extent_tmp->next;
} while (extent_tmp != ext_list_head->next);
return RETURN_OK;
}
/**
*find_exts_group() - Find target exts_group.
*
* @ext_count: the number of extents.
* @filesize: the file's size.
* @exts_group_list_head: the head of the original exts_group list
* @target_exts_group_list_head: the head of the target exts_group list.
*/
int find_exts_group(int *ext_count, unsigned long filesize,
exts_group_t **exts_group_list_head,
exts_group_t **target_exts_group_list_head)
{
int len;
len = 0;/* Blocks we found for target file */
if (!(*exts_group_list_head)) {
return RETURN_NG;
}
while (*exts_group_list_head) {
exts_group_t *exts_group_tmp;
if ((*exts_group_list_head)->len + len >= filesize) {
/*
* Search from the smallest extent group
* to avoid waste of space
*/
exts_group_tmp = (*exts_group_list_head)->prev;
do {
if (exts_group_tmp->len + len >= filesize) {
len += exts_group_tmp->len;
exts_group_tmp =
get_exts_group(exts_group_list_head,
exts_group_tmp);
if (insert_exts_group
(target_exts_group_list_head,
exts_group_tmp) < 0) {
if (exts_group_tmp) {
free(exts_group_tmp);
}
return RETURN_NG;
}
(*ext_count)++;
/* The only entry go out normally*/
return RETURN_OK;
}
exts_group_tmp = exts_group_tmp->prev;
} while (exts_group_tmp !=
(*exts_group_list_head)->prev);
}
len += (*exts_group_list_head)->len;
exts_group_tmp = get_exts_group(exts_group_list_head,
*exts_group_list_head);
if (insert_exts_group(target_exts_group_list_head,
exts_group_tmp) < 0) {
if (exts_group_tmp) {
free(exts_group_tmp);
}
return RETURN_NG;
}
(*ext_count)++;
}
return RETURN_NG;
}
/**
* check_frag_count() - Check file frag.
*
* @fd: the file's discriptor.
* @inode: inode number from struct stat64.
* @extent_count: the number of extents.
*/
int check_frag_count(int fd, unsigned long long inode, int extent_count)
{
int ret, pos, file_extent_count;
struct ext4_extents_info extents_info;
/* Count file exts */
memset(&extents_info, 0, sizeof(struct ext4_extents_info));
file_extent_count = 0;/* Extents count of file */
extents_info.ino = inode;
extents_info.max_entries = DEFRAG_MAX_ENT;
extents_info.entries = 0;
pos = 0;
ret = 0;
do {
extents_info.entries += pos;
pos = extents_info.entries;
ret = ioctl(fd, EXT4_IOC_EXTENTS_INFO, &extents_info);
if (ret < 0) {
return RETURN_NG;
}
file_extent_count += extents_info.entries;
} while (extents_info.entries == DEFRAG_MAX_ENT && ret == 0);
if (extent_count >= file_extent_count) {
/* No improvment */
errno = ENOSPC;
return RETURN_NG;
}
return RETURN_OK;
}
/**
* defrag_proc() - Reserve extent group and execute the defrag program
*
* @fd: the file's discriptor.
* @target_exts_group_head: the head of the original exts_group list.
* @inode: inode number from struct stat64.
*/
int defrag_proc(int fd, exts_group_t *target_exts_group_head,
unsigned long long inode)
{
int ret = 0;
int percent = 0;
int blocksize = 0;
int data_len = 0;
struct stat64 buf;
exts_group_t *exts_group;
extent_t *extent;
struct ext4_extents_info extents_info;
struct ext4_ext_defrag_data defrag_data;
extent_wrap_t *wrap_list = NULL;
/* Reserve free extents */
if (!target_exts_group_head) {
/* Fault */
return RETURN_NG;
}
/* get file size */
memset(&buf, 0, sizeof(struct stat64));
ret = fstat64(fd, &buf);
if (ret < 0) {
perror(NGMSG_FILE_INFO);
return RETURN_NG;
}
/* get block size */
ret = ioctl(fd, FIGETBSZ, &blocksize);
if (ret < 0) {
perror(NGMSG_FILE_BLOCKSIZE);
return RETURN_NG;
}
memset(&extents_info, 0, sizeof(extents_info));
memset(&defrag_data, 0, sizeof(struct ext4_ext_defrag_data));
extents_info.ino = 0;
exts_group = target_exts_group_head;
extents_info.max_entries = DEFRAG_MAX_ENT;
extents_info.ino = inode;
ext4_fsblk_t data_block = 0;
ext4_fsblk_t data_start = 0;
defrag_data.start_offset = 0;
do {
extent_wrap_t *wrap;
extent = exts_group->start;
data_len = 0;
data_start = extent->data.start;
data_block = extent->data.block;
do {
data_len += extent->data.len;
if (extent->tag != EXT4_EXT_USE) {
extent->tag = EXT4_EXT_RESERVE;
extent = extent->next;
continue;
}
extents_info.ino = extent->ino;
extents_info.goal = fgoal;
memcpy(extents_info.ext, &extent->data,
sizeof(struct ext4_extent_data));
wrap = malloc(sizeof(extent_wrap_t));
if (!wrap) {
goto release_blocks;
}
wrap->group_ext = extent;
wrap->next = wrap->prev = wrap;
if (move_wrap(NULL, &wrap_list, wrap) < 0) {
if (wrap) {
free(wrap);
}
goto release_blocks;
}
extent = extent->next;
extents_info.entries = 1;
ret = ioctl(fd, EXT4_IOC_MOVE_VICTIM, &extents_info);
if (ret < 0) {
goto release_blocks;
}
mark_wrap(wrap_list);
free_wrap_list(&wrap_list);
} while (extent != exts_group->end->next);
if (fsync(fd) < 0) {
if (detail_flag) {
perror(NGMSG_FILE_SYNC);
}
return ret;
}
extents_info.entries = 1;
extents_info.ext[0].block = data_block;
extents_info.ext[0].start = data_start;
extents_info.ext[0].len = exts_group->len;
ret = ioctl(fd, EXT4_IOC_RESERVE_BLOCK, &extents_info);
if (ret < 0) {
printf("RESERVE_ERROR ret = %d\n", ret);
printf("block is already used\n");
goto release_blocks;
}
ret = do_defrag(fd, exts_group, 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;
/* print process progress */
if (detail_flag) {
percent = ((long long)ret * blocksize * 100) /
buf.st_size;
if (percent > 100) {
percent = 100;
}
printf("\033[79;16H\033[K progressing ====> %d%%",
percent);
fflush(stdout);
}
exts_group = exts_group->next;
} while (exts_group != target_exts_group_head);
return ret;
release_blocks:
free_wrap_list(&wrap_list);
ret = ioctl(fd, EXT4_IOC_BLOCK_RELEASE);
if (ret < 0) {
return RETURN_NG;
}
return ret;
}
/**
* force_defrag() - Execute the defrag program in force mode.
*
* @fd: the file's descriptor.
* @buf: a pointer of the struct stat64.
* @blocksize: block size in byte.
*/
int force_defrag(int fd, const struct stat64 *buf, int blocksize)
{
int ret = 0;
int exts = 0;
int maxlen = 0;
unsigned int gnumber;
unsigned long filesize;
unsigned long long istart, iend;
ext4_fsblk_t bstart, bend;
extent_t *extlist_head = NULL;
exts_group_t *exts_group_list_head, *exts_group_list_target_head;
struct ext4_group_data_info ext4_group_data;
exts_group_list_head = exts_group_list_target_head = NULL;
/* Get group info */
memset(&ext4_group_data, 0, sizeof(struct ext4_group_data_info));
if (ioctl(fd, EXT4_IOC_GROUP_INFO, &ext4_group_data) < 0) {
return RETURN_NG;
}
gnumber = (buf->st_ino - 1) / ext4_group_data.s_inodes_per_group;
istart = gnumber * ext4_group_data.s_inodes_per_group;
iend = istart + ext4_group_data.s_inodes_per_group - 1;
bstart = gnumber * ext4_group_data.s_blocks_per_group;
bend = bstart + ext4_group_data.s_blocks_per_group - 1;
/* Compute filesize in block */
filesize = (buf->st_size + blocksize - 1) / blocksize;
/* Get used extents in the block group */
ret = get_used_extent(fd, &extlist_head, istart, iend, bstart, bend);
if (ret == RETURN_NG) {
goto freelist;
}
/* Get free extents in the group */
ret = get_free_extent(fd, buf->st_ino,
ext4_group_data.s_blocks_per_group, &extlist_head);
if (ret == RETURN_NG) {
goto freelist;
}
/* All space in this group is used by other groups' inodes */
if (extlist_head == NULL) {
ret = RETURN_NG;
goto freelist;
}
/* Get continuous region(extents group) */
ret = join_extents(extlist_head, &exts_group_list_target_head,
&exts_group_list_head, filesize, &maxlen);
if (ret == RETURN_NG) {
goto freelist;
}
if (ret == CHECK_FRAG_COUNT) {
exts = 1;
goto frag_check;
}
if (maxlen < filesize) {
/* No enough space */
errno = ENOSPC;
ret = RETURN_NG;
goto freelist;
}
if (!exts_group_list_head) {
ret = RETURN_NG;
goto freelist;
}
/* Find target extents group */
ret = find_exts_group(&exts, filesize, &exts_group_list_head,
&exts_group_list_target_head);
if (ret == RETURN_NG) {
goto freelist;
}
frag_check:
/* Check file extent count*/
ret = check_frag_count(fd, buf->st_ino, exts);
if (ret == RETURN_NG) {
goto freelist;
}
/* Reserve extent group and execute the defrag program */
ret = defrag_proc(fd, exts_group_list_target_head, buf->st_ino);
freelist:
free_exts_group(exts_group_list_target_head);
free_exts_group(exts_group_list_head);
free_ext(extlist_head);
return ret;
}
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