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Date: Fri, 30 Jan 2009 15:14:15 +0900
From: Akira Fujita <a-fujita@...jp.nec.com>
To: Theodore Tso <tytso@....edu>, linux-ext4@...r.kernel.org
CC: linux-fsdevel@...r.kernel.org
Subject: [RFC][PATCH 3/3] ext4: Ext4 online defrag command
ext4: online defrag -- Ext4 online defrag command
From: Akira Fujita <a-fujita@...jp.nec.com>
- Usage is as follows:
- Defrag for a single file.
# e4defrag file, directory, device
- Check the file fragments on ext4.
# e4defrag -c file, directory, device
Signed-off-by: Akira Fujita <a-fujita@...jp.nec.com>
Signed-off-by: Takashi Sato <t-sato@...jp.nec.com>
---
/*
* e4defrag.c - ext4 filesystem defragmenter
*
* Copyright (C) 2009 NEC Software Tohoku, Ltd.
*
* Author: Akira Fujita <a-fujita@...jp.nec.com>
* Takashi Sato <t-sato@...jp.nec.com>
*/
#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>
#include <ext2fs/ext2_types.h>
#include <math.h>
/* Ioctl command */
#define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap)
#define EXT4_IOC_DEFRAG _IOW('f', 15, struct move_extent)
/* Macro functions */
#define PRINT_ERR_MSG(msg) fprintf(stderr, "%s\n", (msg))
#define IN_FTW_PRINT_ERR_MSG(msg) \
fprintf(stderr, "\t%s\t\t[ NG ]\n", (msg))
#define PRINT_FILE_NAME(file) fprintf(stderr, " \"%s\"\n", (file))
#define PRINT_ERR_MSG_WITH_ERRNO(msg) \
fprintf(stderr, "\t%s:%s\t[ NG ]\n", (msg), strerror(errno))
#define STATISTIC_ERR_MSG(msg) \
fprintf(stderr, "\t%s\n", (msg))
#define STATISTIC_ERR_MSG_WITH_ERRNO(msg) \
fprintf(stderr, "\t%s:%s\n", (msg), strerror(errno))
#define min(x, y) (((x) > (y)) ? (y) : (x))
#define SECTOR_TO_BLOCK(sectors, blocksize) \
((sectors) / ((blocksize) >> 9))
#define CALC_SCORE(ratio) \
(powf((ratio), 0.09) * 66.1)
#define CALC_BLKS_PER_GROUP(blocksize) \
((blocksize) * 8)
/* Wrap up the free function */
#define FREE(tmp) \
do { \
if (tmp) \
free(tmp); \
} while (0) \
/* 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)
#ifndef __NR_fadvise64
#define __NR_fadvise64 250
#endif
#ifndef __NR_sync_file_range
#define __NR_sync_file_range 314
#endif
#ifndef __NR_fallocate
#define __NR_fallocate 324
#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 RETURN_GFS_ERR -2
/*
* Restriction for uninitialized extent file.
* This will be gone away, soon.
*/
#define RETURN_UNINIT_EXT_ERR -3
#define FTW_CONT 0
#define FTW_OPEN_FD 2000
#define FS_EXT4 "ext4"
#define ROOT_UID 0
#define DEFAULT_SCORE 55
/* Magic number for ext4 */
#define EXT4_SUPER_MAGIC 0xEF53
/* Defrag size(64MB) per ioctl */
#define DEFRAG_SIZE ((unsigned long)1 << 26)
/* The following four macros are used for ioctl FS_IOC_FIEMAP
* FIEMAP_FLAG_SYNC: sync file data before map.
* FIEMAP_EXTENT_LAST: last extent in file.
* FIEMAP_MAX_OFFSET: max file offset.
* EXTENT_MAX_COUNT: the maximum number of extents for exchanging between
* kernel-space and user-space per ioctl
*/
#define FIEMAP_FLAG_SYNC 0x00000001
#define FIEMAP_EXTENT_LAST 0x00000001
#define FIEMAP_EXTENT_UNWRITTEN 0x00000800
#define FIEMAP_MAX_OFFSET (~0ULL)
#define EXTENT_MAX_COUNT 512
/* The following macros are error message */
#define MSG_USAGE \
"Usage : e4defrag [-v] file...| directory...| device...\n\
: e4defrag -c file...| directory...| device...\n"
#define NGMSG_MTAB "Can not access /etc/mtab"
#define NGMSG_UNMOUNT "FS is not mounted"
#define NGMSG_EXT4 "FS is not ext4 File System"
#define NGMSG_FS_INFO "Get FSInfo fail"
#define NGMSG_FILE_INFO "Get FileInfo fail"
#define NGMSG_FILE_OPEN "Open fail"
#define NGMSG_FILE_SYNC "Sync(fsync) fail"
#define NGMSG_FILE_DEFRAG "Defrag fail"
#define NGMSG_FILE_BLOCKSIZE "Can't get blocksize"
#define NGMSG_FILE_UNREG "File is not regular file"
#define NGMSG_FILE_LARGE \
"Defrag size is larger than FileSystem's free space"
#define NGMSG_FILE_AUTHORITY \
"File is not current user's file or current user is not root"
#define NGMSG_FILE_LOCK "File is locked"
#define NGMSG_FILE_BLANK "File size is 0"
#define NGMSG_GET_LCKINFO "Get LockInfo fail"
#define NGMSG_LOST_FOUND "Can not process \"lost+found\""
#define NGMSG_REALPATH "Can not get full path"
#define NGMSG_FILE_MAP "Get file map fail"
#define NGMSG_FILE_DROP_BUFFER "Free page fail"
#define NGMSG_FADVISE_SYSCALL "\tFadvise fail"
#define NGMSG_FILE_EXTENT "Get file extents fail"
#define NGMSG_FILE_UNLINK "Unlink fail"
#define NGMSG_FILE_FALLOC "Fallocate fail"
#define NGMSG_FILE_IN_DEFRAG "File is being defraged by other program"
/*
* Restriction for uninitialized extent file.
* This will be gone away, soon.
*/
#define NGMSG_UNINIT_EXTENT "Can not handle uninit extents"
/* Data type for filesystem-wide blocks number */
typedef unsigned long long ext4_fsblk_t;
/* Data type for file logical block number */
typedef unsigned int ext4_lblk_t;
struct fiemap_extent_data {
ext4_lblk_t len; /* blocks count */
ext4_lblk_t logical; /* start logical block number */
ext4_fsblk_t physical; /* start physical block number */
};
struct fiemap_extent_list {
struct fiemap_extent_list *prev;
struct fiemap_extent_list *next;
struct fiemap_extent_data data; /* extent belong to file */
};
struct fiemap_extent_group {
struct fiemap_extent_group *prev;
struct fiemap_extent_group *next;
ext4_lblk_t len; /* length of this continuous region */
struct fiemap_extent_list *start; /* start ext */
struct fiemap_extent_list *end; /* end ext */
};
struct move_extent {
int org_fd; /* original file descriptor */
int dest_fd; /* destination file descriptor */
ext4_lblk_t start; /* logical offset of org_fd and dest_fd*/
ext4_lblk_t len; /* exchange block length */
};
struct fiemap_extent {
__u64 fe_logical; /* logical offset in bytes for the start of
* the extent from the beginning of the file */
__u64 fe_physical; /* physical offset in bytes for the start
* of the extent from the beginning
* of the disk */
__u64 fe_length; /* length in bytes for this extent */
__u64 fe_reserved64[2];
__u32 fe_flags; /* FIEMAP_EXTENT_* flags for this extent */
__u32 fe_reserved[3];
};
struct fiemap {
__u64 fm_start; /* logical offset (inclusive) at
* which to start mapping (in) */
__u64 fm_length; /* logical length of mapping which
* userspace wants (in) */
__u32 fm_flags; /* FIEMAP_FLAG_* flags for request (in/out) */
__u32 fm_mapped_extents;/* number of extents that were mapped (out) */
__u32 fm_extent_count; /* size of fm_extents array (in) */
__u32 fm_reserved;
struct fiemap_extent fm_extents[0];/* array of mapped extents (out) */
};
struct statistic_ino {
int now_count; /* the file's extents count of before defrag */
int best_count; /* the best file's extents count */
float ratio; /* the ratio of fragmentation */
char msg_buffer[PATH_MAX + 1]; /* pathname of the file */
};
int detail_flag;
int statistic_flag;
int extents_before_defrag;
int extents_after_defrag;
unsigned int current_uid;
unsigned int succeed_cnt;
unsigned int regular_count;
unsigned int total_count;
unsigned int frag_files_before_defrag;
unsigned int frag_files_after_defrag;
unsigned int defraged_file_count;
char lost_found_dir[PATH_MAX + 1];
ext4_fsblk_t files_block_count;
struct statistic_ino sta_array[5];
/*
* fadvise() - Give advice about file access.
*
* @fd: the file's 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: the file's descriptor.
* @offset: file offset.
* @length: area length.
* @flag: 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);
}
/*
* fallocate() - Manipulate file space.
*
* @fd: the file's descriptor.
* @mode: process flag.
* @offset: file offset.
* @len: file size.
*/
int fallocate(int fd, int mode, loff_t offset, loff_t len)
{
return syscall(__NR_fallocate, fd, mode, offset, len);
}
/*
* 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)
{
/* Refer to /etc/mtab */
char *mtab = MOUNTED;
FILE *fp = NULL;
struct mntent *mnt = NULL;
fp = setmntent(mtab, "r");
if (fp == NULL) {
perror(NGMSG_MTAB);
return RETURN_NG;
}
while ((mnt = getmntent(fp)) != NULL) {
if (strcmp(devname, mnt->mnt_fsname) != 0)
continue;
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;
}
/*
* is_ext4() - Whether on an ext4 filesystem.
*
* @filename: the file's name.
*/
int is_ext4(const char *filename)
{
int maxlen, len, ret;
FILE *fp = NULL;
char *mnt_type = NULL;
/* Refer to /etc/mtab */
char *mtab = MOUNTED;
char file_path[PATH_MAX + 1];
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;
}
fp = setmntent(mtab, "r");
if (fp == NULL) {
perror(NGMSG_MTAB);
return RETURN_NG;
}
maxlen = 0;
while ((mnt = getmntent(fp)) != NULL) {
len = strlen(mnt->mnt_dir);
ret = memcmp(file_path, mnt->mnt_dir, len);
if (ret != 0)
continue;
if (maxlen >= len)
continue;
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);
strncpy(lost_found_dir, mnt->mnt_dir, PATH_MAX);
}
endmntent(fp);
if (strcmp(mnt_type, FS_EXT4) == 0) {
FREE(mnt_type);
return RETURN_OK;
} else {
FREE(mnt_type);
PRINT_ERR_MSG(NGMSG_EXT4);
return RETURN_NG;
}
}
/*
* calc_entry_counts() - Calculate file counts.
*
* @file: file name.
* @buf: file info.
* @flag: file type.
* @ftwbuf: the pointer of a struct FTW.
*/
int calc_entry_counts(const char *file, const struct stat64 *buf, int flag,
struct FTW *ftwbuf)
{
if (S_ISREG(buf->st_mode))
regular_count++;
total_count++;
return FTW_CONT;
}
/*
* page_in_core() - Get information on whether pages are in core.
*
* @fd: the file's descriptor.
* @defrag_data: data used for defrag.
* @vec: page state array.
* @page_num: page number.
*/
int page_in_core(int fd, struct move_extent defrag_data,
unsigned char **vec, unsigned int *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 = (loff_t)defrag_data.start * blocksize;
length = (loff_t)defrag_data.len * 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 ||
munmap(page, length) == -1) {
FREE(*vec);
return RETURN_NG;
}
return RETURN_OK;
}
/*
* defrag_fadvise() - Predeclare an access pattern for file data.
*
* @fd: the file's descriptor.
* @defrag_data: data used for defrag.
* @vec: page state array.
* @page_num: page number.
*/
int defrag_fadvise(int fd, struct move_extent defrag_data,
unsigned char *vec, unsigned int 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 int i;
loff_t offset;
if (ioctl(fd, FIGETBSZ, &blocksize) < 0)
return RETURN_NG;
offset = (loff_t)defrag_data.start * 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 which 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.
* @file_name file name.
* @buf: the pointer of the struct stat64.
*/
int check_free_size(int fd, const char *file_name, const struct stat64 *buf)
{
ext4_fsblk_t physical_block_count = 0;
ext4_fsblk_t free_physical_block_count = 0;
struct statfs64 fsbuf;
if (fstatfs64(fd, &fsbuf) < 0) {
if (detail_flag) {
PRINT_FILE_NAME(file_name);
PRINT_ERR_MSG_WITH_ERRNO(NGMSG_FS_INFO);
}
return RETURN_GFS_ERR;
}
/* Target file size measured by filesystem IO blocksize */
physical_block_count = SECTOR_TO_BLOCK(buf->st_blocks, fsbuf.f_bsize);
/* Compute free space for root and normal user separately */
if (current_uid == ROOT_UID)
free_physical_block_count = fsbuf.f_bfree;
else
free_physical_block_count = fsbuf.f_bavail;
if (free_physical_block_count >= physical_block_count)
return RETURN_OK;
return RETURN_NG;
}
/*
* file_frag_count() - Get file fragment count.
*
* @fd: the file's descriptor.
*/
int file_frag_count(int fd)
{
int ret = RETURN_NG;
struct fiemap file_extent_map;
/* When fm_extent_count is 0,
* ioctl just get file fragment count.
*/
memset(&file_extent_map, 0, sizeof(struct fiemap));
file_extent_map.fm_start = 0;
file_extent_map.fm_length = FIEMAP_MAX_OFFSET;
file_extent_map.fm_flags |= FIEMAP_FLAG_SYNC;
ret = ioctl(fd, FS_IOC_FIEMAP, &file_extent_map);
if (ret < 0)
return RETURN_NG;
return file_extent_map.fm_mapped_extents;
}
/*
* file_check() - Check file's attributes.
*
* @fd: the file's descriptor.
* @buf: a pointer of the struct stat64.
* @file_name: the file's name.
* @extents: the file's extents.
*/
int file_check(int fd, const struct stat64 *buf, const char *file_name,
int extents)
{
int ret;
struct flock lock;
/* Write-lock check is more reliable */
lock.l_type = F_WRLCK;
lock.l_start = 0;
lock.l_whence = SEEK_SET;
lock.l_len = 0;
/* Free space */
ret = check_free_size(fd, file_name, buf);
if (ret == RETURN_NG) {
if (detail_flag) {
printf("\033[79;0H\033[K[%u/%u] \"%s\"\t\t"
" extents: %d -> %d\n", defraged_file_count,
total_count, file_name, extents, extents);
IN_FTW_PRINT_ERR_MSG(NGMSG_FILE_LARGE);
}
return RETURN_NG;
} else if (ret == RETURN_GFS_ERR)
return RETURN_NG;
/* Access authority */
if (current_uid != ROOT_UID &&
buf->st_uid != current_uid) {
if (detail_flag) {
printf("\033[79;0H\033[K[%u/%u] \"%s\"\t\t"
" extents: %d -> %d\n", defraged_file_count,
total_count, file_name, extents, extents);
IN_FTW_PRINT_ERR_MSG(NGMSG_FILE_AUTHORITY);
}
return RETURN_NG;
}
/* Lock status */
if (fcntl(fd, F_GETLK, &lock) < 0) {
if (detail_flag) {
PRINT_FILE_NAME(file_name);
PRINT_ERR_MSG_WITH_ERRNO(NGMSG_GET_LCKINFO);
}
return RETURN_NG;
} else if (lock.l_type != F_UNLCK) {
if (detail_flag) {
PRINT_FILE_NAME(file_name);
IN_FTW_PRINT_ERR_MSG(NGMSG_FILE_LOCK);
}
return RETURN_NG;
}
/* Empty file */
if (buf->st_size == 0) {
if (detail_flag) {
PRINT_FILE_NAME(file_name);
IN_FTW_PRINT_ERR_MSG(NGMSG_FILE_BLANK);
}
return RETURN_NG;
}
return RETURN_OK;
}
/*
* insert_extent() - Sequentially insert extent.
*
* @extlist_head: the head of an extent list.
* @ext: the extent element which will be inserted.
*/
int insert_extent(struct fiemap_extent_list **extlist_head,
struct fiemap_extent_list *ext)
{
struct fiemap_extent_list *ext_tmp = *extlist_head;
if (ext == NULL)
goto out;
/* 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.logical <= ext_tmp->data.logical) {
/* Insert before head */
if (ext_tmp->data.logical < ext->data.logical + ext->data.len)
/* Overlap */
goto out;
/* Adjust head */
*extlist_head = ext;
} else {
/* Insert into the middle or last of the list */
do {
if (ext->data.logical < ext_tmp->data.logical)
break;
ext_tmp = ext_tmp->next;
} while (ext_tmp != (*extlist_head));
if (ext->data.logical <
ext_tmp->prev->data.logical + ext_tmp->prev->data.len)
/* Overlap */
goto out;
if (ext_tmp != *extlist_head &&
ext_tmp->data.logical < ext->data.logical + ext->data.len)
/* Overlap */
goto out;
}
ext_tmp = ext_tmp->prev;
/* Insert "ext" after "ext_tmp" */
insert(ext_tmp, ext);
return RETURN_OK;
out:
errno = EINVAL;
return RETURN_NG;
}
/*
* insert_exts_group() - Insert a exts_group.
*
* @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(struct fiemap_extent_group **exts_group_list_head,
struct fiemap_extent_group *exts_group)
{
struct fiemap_extent_group *exts_group_tmp = NULL;
if (exts_group == NULL) {
errno = EINVAL;
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;
}
exts_group_tmp = (*exts_group_list_head)->prev;
insert(exts_group_tmp, exts_group);
return RETURN_OK;
}
/*
* join_extents() - Find continuous region(exts_group).
*
* @ext_list_head: the head of the extent list.
* @exts_group_list_head: the head of the target exts_group list.
*/
int join_extents(struct fiemap_extent_list *ext_list_head,
struct fiemap_extent_group **exts_group_list_head)
{
ext4_lblk_t len;
struct fiemap_extent_list *ext_start, *extent_tmp;
ext_start = ext_list_head;
extent_tmp = ext_list_head;
len = ext_list_head->data.len;
extent_tmp = extent_tmp->next;
do {
struct fiemap_extent_group *exts_group_tmp = NULL;
/* This extent and previous extent are not continuous,
* so, all previous extents are treated as an extent group.
*/
if ((extent_tmp->prev->data.logical +
extent_tmp->prev->data.len)
!= extent_tmp->data.logical) {
exts_group_tmp =
malloc(sizeof(struct fiemap_extent_group));
if (exts_group_tmp == NULL)
return RETURN_NG;
memset(exts_group_tmp, 0,
sizeof(struct fiemap_extent_group));
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) {
FREE(exts_group_tmp);
return RETURN_NG;
}
ext_start = extent_tmp;
len = extent_tmp->data.len;
extent_tmp = extent_tmp->next;
continue;
}
/* This extent and previous extent are continuous,
* so, they belong to the same extent group, and we check
* if the next extent belongs 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;
}
/*
* get_file_extents() - Get file extent in the block group.
*
* @fd: the file's descriptor.
* @ext_list_head: the head of the extent list.
*/
int get_file_extents(int fd, struct fiemap_extent_list **ext_list_head)
{
int i;
int ret = 0;
int blocksize;
int extents_buffer_size, fiemap_buffer_size;
__u64 pos = 0;
struct fiemap *fiemap_buf = NULL;
struct fiemap_extent *extents_buf = NULL;
struct fiemap_extent_list *extent = NULL;
ret = ioctl(fd, FIGETBSZ, &blocksize);
if (ret < 0)
return RETURN_NG;
/* Convert units, in bytes.
* Be careful : now, physical block number in extent is 48bit,
* and the maximum blocksize for ext4 is 4K(12bit),
* so there is no overflow, but in future it may be changed.
*/
/* Alloc space for fiemap */
extents_buffer_size = EXTENT_MAX_COUNT * sizeof(struct fiemap_extent);
fiemap_buffer_size = sizeof(struct fiemap) + extents_buffer_size;
fiemap_buf = malloc(fiemap_buffer_size);
if (!fiemap_buf)
return RETURN_NG;
extents_buf = fiemap_buf->fm_extents;
memset(fiemap_buf, 0, fiemap_buffer_size);
fiemap_buf->fm_length = FIEMAP_MAX_OFFSET;
fiemap_buf->fm_flags |= FIEMAP_FLAG_SYNC;
fiemap_buf->fm_extent_count = EXTENT_MAX_COUNT;
pos = 0;
do {
fiemap_buf->fm_start = pos;
memset(extents_buf, 0, extents_buffer_size);
ret = ioctl(fd, FS_IOC_FIEMAP, fiemap_buf);
if (ret < 0)
goto out;
for (i = 0; i < fiemap_buf->fm_mapped_extents; i++) {
extent = NULL;
extent = malloc(sizeof(struct fiemap_extent_list));
if (extent == NULL)
goto out;
/*
* Restriction for uninitialized extent file.
* This will be gone away, soon.
*/
if (extents_buf[i].fe_flags & FIEMAP_EXTENT_UNWRITTEN) {
FREE(extent);
FREE(fiemap_buf);
return RETURN_UNINIT_EXT_ERR;
}
extent->data.physical = extents_buf[i].fe_physical
/ blocksize;
extent->data.logical = extents_buf[i].fe_logical
/ blocksize;
extent->data.len = extents_buf[i].fe_length
/ blocksize;
ret = insert_extent(ext_list_head, extent);
if (ret < 0) {
FREE(extent);
goto out;
}
}
/* Record file's logical offset this time */
pos = extents_buf[EXTENT_MAX_COUNT-1].fe_logical +
extents_buf[EXTENT_MAX_COUNT-1].fe_length;
/* If fm_extents array has been filled and
* there are extents left, continue to cycle.
*/
} while (fiemap_buf->fm_mapped_extents
== EXTENT_MAX_COUNT &&
!(extents_buf[EXTENT_MAX_COUNT-1].fe_flags
& FIEMAP_EXTENT_LAST));
FREE(fiemap_buf);
return RETURN_OK;
out:
FREE(fiemap_buf);
return RETURN_NG;
}
/*
* free_ext() - Free the extent list.
*
* @extent_list_head: the extent list head of which will be free.
*/
void free_ext(struct fiemap_extent_list *extent_list_head)
{
struct fiemap_extent_list *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);
}
/*
* free_exts_group() - Free the exts_group.
*
* @*exts_group_list_head: the exts_group list head which will be free.
*/
void free_exts_group(struct fiemap_extent_group *exts_group_list_head)
{
struct fiemap_extent_group *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);
}
/*
* statistic_fn() - Get statistic info of the file's fragments.
*
* @file: the file's name.
* @buf: the pointer of the struct stat64.
* @flag: file type.
* @ftwbuf: the pointer of a struct FTW.
*/
int statistic_fn(const char *file, const struct stat64 *buf, int flag,
struct FTW *ftwbuf)
{
int fd;
int blocksize;
int ret = 0;
int now_extents_count, best_extents_count;
int i, j;
float ratio = 0.0;
ext4_fsblk_t physical_block_count = 0;
char msg_buffer[PATH_MAX + 24];
defraged_file_count++;
if (detail_flag) {
if (total_count == 1 && regular_count == 1)
printf("<File>\n");
else {
printf("[%u/%u]", defraged_file_count, total_count);
fflush(stdout);
}
}
if (lost_found_dir[0] != '\0' &&
!memcmp(file, lost_found_dir, strnlen(lost_found_dir, PATH_MAX))) {
if (detail_flag) {
PRINT_FILE_NAME(file);
STATISTIC_ERR_MSG(NGMSG_LOST_FOUND);
}
return FTW_CONT;
}
if (!S_ISREG(buf->st_mode)) {
if (detail_flag) {
PRINT_FILE_NAME(file);
STATISTIC_ERR_MSG(NGMSG_FILE_UNREG);
}
return FTW_CONT;
}
/* Access authority */
if (current_uid != ROOT_UID &&
buf->st_uid != current_uid) {
if (detail_flag) {
PRINT_FILE_NAME(file);
STATISTIC_ERR_MSG(NGMSG_FILE_AUTHORITY);
}
return FTW_CONT;
}
/* Empty file */
if (buf->st_size == 0) {
if (detail_flag) {
PRINT_FILE_NAME(file);
STATISTIC_ERR_MSG(NGMSG_FILE_BLANK);
}
return FTW_CONT;
}
fd = open64(file, O_RDONLY);
if (fd < 0) {
if (detail_flag) {
PRINT_FILE_NAME(file);
STATISTIC_ERR_MSG_WITH_ERRNO(NGMSG_FILE_OPEN);
}
return FTW_CONT;
}
/* Get blocksize */
ret = ioctl(fd, FIGETBSZ, &blocksize);
if (ret < 0) {
if (detail_flag) {
PRINT_FILE_NAME(file);
STATISTIC_ERR_MSG_WITH_ERRNO(NGMSG_FILE_BLOCKSIZE);
}
goto out;
}
/* Count file fragments before defrag */
now_extents_count = file_frag_count(fd);
if (now_extents_count == RETURN_NG) {
if (detail_flag) {
PRINT_FILE_NAME(file);
STATISTIC_ERR_MSG_WITH_ERRNO(NGMSG_FILE_INFO);
}
goto out;
}
physical_block_count = SECTOR_TO_BLOCK(buf->st_blocks, blocksize);
best_extents_count = ((physical_block_count - 1) /
CALC_BLKS_PER_GROUP(blocksize)) + 1;
ratio = (float)(now_extents_count - best_extents_count) * 100 /
physical_block_count;
extents_before_defrag += now_extents_count;
extents_after_defrag += best_extents_count;
files_block_count += physical_block_count;
if (total_count == 1 && regular_count == 1) {
/* File only */
if (detail_flag) {
int count = 0;
struct fiemap_extent_list *file_extlist_head = NULL;
struct fiemap_extent_list *extent_tmp = NULL;
ret = get_file_extents(fd, &file_extlist_head);
if (ret < 0) {
PRINT_FILE_NAME(file);
STATISTIC_ERR_MSG_WITH_ERRNO(NGMSG_FILE_EXTENT);
free_ext(file_extlist_head);
goto out;
}
extent_tmp = file_extlist_head;
/* Print extents info */
do {
count++;
printf("[ext %d]:\tstart %llu:\tlogical "
"%u:\tlen %u\n", count,
extent_tmp->data.physical,
extent_tmp->data.logical,
extent_tmp->data.len);
extent_tmp = extent_tmp->next;
} while (extent_tmp != file_extlist_head);
free_ext(file_extlist_head);
} else {
printf("%-40s%10s/%-10s%9s\n",
"<File>", "now", "best", "ratio");
if (strlen(file) > 40)
printf("%s\n%50d/%-10d%8.2f%%\n",
file, now_extents_count,
best_extents_count, ratio);
else
printf("%-40s%10d/%-10d%8.2f%%\n",
file, now_extents_count,
best_extents_count, ratio);
}
succeed_cnt++;
goto out;
}
if (detail_flag) {
/* Print statistic info */
sprintf(msg_buffer, "[%u/%u]%s",
defraged_file_count, total_count, file);
if (strlen(msg_buffer) > 40)
printf("\033[79;0H\033[K%s\n%50d/%-10d%8.2f%%\n",
msg_buffer, now_extents_count,
best_extents_count, ratio);
else
printf("\033[79;0H\033[K%-40s%10d/%-10d%8.2f%%\n",
msg_buffer, now_extents_count,
best_extents_count, ratio);
}
for (i = 0; i <= 4; i++) {
if (ratio >= sta_array[i].ratio) {
for (j = 4; j > i; j--) {
memcpy(&sta_array[j], &sta_array[j - 1],
sizeof(struct statistic_ino));
}
memset(&sta_array[i], 0, sizeof(struct statistic_ino));
strncpy(sta_array[i].msg_buffer, file,
strnlen(file, PATH_MAX));
sta_array[i].now_count = now_extents_count;
sta_array[i].best_count = best_extents_count;
sta_array[i].ratio = ratio;
break;
}
}
succeed_cnt++;
out:
close(fd);
return FTW_CONT;
}
/*
* file_defrag() - Execute the defrag program.
*
* @fd: the target file's descriptor.
* @tmp_fd: the temp file's descriptor.
* @file_name: file name.
* @buf: the pointer of the struct stat64.
* @ext_group_head: the head of the extent group list.
*/
int file_defrag(int fd, int tmp_fd, const char *file_name,
const struct stat64 *buf, struct fiemap_extent_group *ext_group_head)
{
loff_t start = 0;
unsigned int page_num;
unsigned char *vec = NULL;
ext4_lblk_t move_len, default_len;
int defraged_size = 0;
int percent = 0;
int ret;
struct move_extent move_data;
struct fiemap_extent_group *ext_group_tmp = NULL;
memset(&move_data, 0, sizeof(struct move_extent));
move_data.org_fd = fd;
move_data.dest_fd = tmp_fd;
/* Print process progress */
percent = (start * 100) / buf->st_size;
printf("\033[79;0H\033[K[%u/%u]%s:\t%3d%%",
defraged_file_count, total_count, file_name, min(percent, 100));
fflush(stdout);
default_len = (DEFRAG_SIZE + buf->st_blksize - 1) / buf->st_blksize;
ext_group_tmp = ext_group_head;
do {
move_len = ext_group_tmp->len;
move_data.start = ext_group_tmp->start->data.logical;
while (move_len > 0) {
if (move_len <= default_len) {
move_data.len = move_len;
move_len = 0;
} else {
move_data.len = default_len;
move_len -= default_len;
}
ret = page_in_core(fd, move_data, &vec, &page_num);
if (ret < 0) {
if (detail_flag) {
printf("\n");
PRINT_ERR_MSG_WITH_ERRNO(
NGMSG_FILE_MAP);
} else {
printf("\t[ NG ]\n");
}
return RETURN_NG;
}
/* EXT4_IOC_DEFRAG */
defraged_size = ioctl(fd, EXT4_IOC_DEFRAG, &move_data);
/* Free pages */
ret = defrag_fadvise(fd, move_data, vec, page_num);
if (vec) {
free(vec);
vec = NULL;
}
if (ret < 0) {
if (detail_flag) {
printf("\n");
PRINT_ERR_MSG_WITH_ERRNO(
NGMSG_FILE_DROP_BUFFER);
} else {
printf("\t[ NG ]\n");
}
return RETURN_NG;
}
if (defraged_size < 0) {
if (detail_flag) {
printf("\n");
PRINT_ERR_MSG_WITH_ERRNO(
NGMSG_FILE_DEFRAG);
} else {
printf("\t[ NG ]\n");
}
return RETURN_NG;
}
move_data.start += defraged_size;
start = (loff_t)move_data.start * buf->st_blksize;
/* Print process progress */
percent = (start * 100) / buf->st_size;
printf("\033[79;0H\033[K[%u/%u]%s:\t%3d%%",
defraged_file_count, total_count, file_name,
min(percent, 100));
fflush(stdout);
}
/* End of file */
if (start >= buf->st_size)
break;
ext_group_tmp = ext_group_tmp->next;
} while (ext_group_tmp != ext_group_head);
return RETURN_OK;
}
/*
* ftw_fn() - Check file attributes and call ioctl to defrag.
*
* @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 tmp_fd = -1;
int blocksize;
int defrag_fail = 0;
int ret = RETURN_NG;
int best;
int file_frags_start, file_frags_end, tmp_ext_count;
char tmp_inode_name[PATH_MAX + 8];
struct fiemap_extent_list *ext_list_head = NULL;
struct fiemap_extent_group *ext_group_head = NULL;
struct fiemap_extent_group *ext_group_tmp = NULL;
defraged_file_count++;
if (detail_flag) {
printf("[%u/%u]", defraged_file_count, total_count);
fflush(stdout);
}
if (lost_found_dir[0] != '\0' &&
!memcmp(file, lost_found_dir, strnlen(lost_found_dir, PATH_MAX))) {
if (detail_flag) {
PRINT_FILE_NAME(file);
IN_FTW_PRINT_ERR_MSG(NGMSG_LOST_FOUND);
}
return FTW_CONT;
}
if (!S_ISREG(buf->st_mode)) {
if (detail_flag) {
PRINT_FILE_NAME(file);
IN_FTW_PRINT_ERR_MSG(NGMSG_FILE_UNREG);
}
return FTW_CONT;
}
fd = open64(file, O_RDONLY);
if (fd < 0) {
if (detail_flag) {
PRINT_FILE_NAME(file);
PRINT_ERR_MSG_WITH_ERRNO(NGMSG_FILE_OPEN);
}
return FTW_CONT;
}
/* Count file fragments before defrag */
file_frags_start = file_frag_count(fd);
if (file_frags_start == RETURN_NG) {
if (detail_flag) {
PRINT_FILE_NAME(file);
PRINT_ERR_MSG_WITH_ERRNO(NGMSG_FILE_INFO);
}
goto out;
}
if (file_check(fd, buf, file, file_frags_start) == RETURN_NG)
goto out;
if (fsync(fd) < 0) {
if (detail_flag) {
PRINT_FILE_NAME(file);
PRINT_ERR_MSG_WITH_ERRNO(NGMSG_FILE_SYNC);
}
goto out;
}
/* Get blocksize */
if (ioctl(fd, FIGETBSZ, &blocksize) < 0) {
if (detail_flag) {
PRINT_FILE_NAME(file);
PRINT_ERR_MSG_WITH_ERRNO(NGMSG_FILE_BLOCKSIZE);
}
goto out;
}
best = (SECTOR_TO_BLOCK(buf->st_blocks, blocksize) - 1)
/ CALC_BLKS_PER_GROUP(blocksize) + 1;
if (file_frags_start == best)
goto check_improvement;
/* Get file's extents */
ret = get_file_extents(fd, &ext_list_head);
if (ret < 0) {
if (detail_flag) {
PRINT_FILE_NAME(file);
if (ret == RETURN_UNINIT_EXT_ERR)
IN_FTW_PRINT_ERR_MSG(NGMSG_UNINIT_EXTENT);
else
PRINT_ERR_MSG_WITH_ERRNO(NGMSG_FILE_EXTENT);
}
goto out;
}
/* Combine extents to group */
ret = join_extents(ext_list_head, &ext_group_head);
if (ret < 0) {
if (detail_flag) {
PRINT_FILE_NAME(file);
PRINT_ERR_MSG_WITH_ERRNO(NGMSG_FILE_EXTENT);
}
goto out;
}
/* Create donor inode */
memset(tmp_inode_name, 0, PATH_MAX + 8);
sprintf(tmp_inode_name, "%.*s.defrag", strnlen(file, PATH_MAX), file);
tmp_fd = open64(tmp_inode_name, O_WRONLY | O_CREAT | O_EXCL, S_IRUSR);
if (tmp_fd < 0) {
if (detail_flag) {
PRINT_FILE_NAME(file);
if (errno == EEXIST)
PRINT_ERR_MSG_WITH_ERRNO(NGMSG_FILE_IN_DEFRAG);
else
PRINT_ERR_MSG_WITH_ERRNO(NGMSG_FILE_OPEN);
}
goto out;
}
/* Unlink donor inode */
ret = unlink(tmp_inode_name);
if (ret < 0) {
if (detail_flag) {
PRINT_FILE_NAME(file);
PRINT_ERR_MSG_WITH_ERRNO(NGMSG_FILE_UNLINK);
}
goto out;
}
/* Allocate space for donor inode */
ext_group_tmp = ext_group_head;
do {
ret = fallocate(tmp_fd, 0,
(loff_t)ext_group_tmp->start->data.logical * blocksize,
(loff_t)ext_group_tmp->len * blocksize);
if (ret < 0) {
if (detail_flag) {
PRINT_FILE_NAME(file);
PRINT_ERR_MSG_WITH_ERRNO(NGMSG_FILE_FALLOC);
}
goto out;
}
ext_group_tmp = ext_group_tmp->next;
} while (ext_group_tmp != ext_group_head);
/* Get donor inode's extents count */
tmp_ext_count = file_frag_count(tmp_fd);
if (tmp_ext_count == RETURN_NG) {
if (detail_flag) {
PRINT_FILE_NAME(file);
PRINT_ERR_MSG_WITH_ERRNO(NGMSG_FILE_INFO);
}
goto out;
}
check_improvement:
if (detail_flag) {
if (file_frags_start != 1)
frag_files_before_defrag++;
extents_before_defrag += file_frags_start;
}
if (file_frags_start == best || file_frags_start <= tmp_ext_count) {
printf("\033[79;0H\033[K[%u/%u]%s:\t%3d%%",
defraged_file_count, total_count, file, 100);
if (detail_flag)
printf(" extents: %d -> %d",
file_frags_start, file_frags_start);
printf("\t[ OK ]\n");
succeed_cnt++;
if (file_frags_start != 1)
frag_files_after_defrag++;
extents_after_defrag += file_frags_start;
goto out;
}
/* Defrag the file */
ret = file_defrag(fd, tmp_fd, file, buf, ext_group_head);
if (ret < 0)
defrag_fail = 1;
/* Count file fragments after defrag and print extents info */
if (detail_flag) {
file_frags_end = file_frag_count(fd);
if (file_frags_end == RETURN_NG) {
printf("\n");
PRINT_ERR_MSG_WITH_ERRNO(NGMSG_FILE_INFO);
goto out;
}
if (file_frags_end != 1)
frag_files_after_defrag++;
extents_after_defrag += file_frags_end;
if (defrag_fail)
goto out;
printf(" extents: %d -> %d",
file_frags_start, file_frags_end);
fflush(stdout);
}
if (defrag_fail)
goto out;
printf("\t[ OK ]\n");
fflush(stdout);
succeed_cnt++;
out:
close(fd);
if (tmp_fd != -1)
close(tmp_fd);
free_ext(ext_list_head);
free_exts_group(ext_group_head);
return FTW_CONT;
}
/*
* main() - Ext4 online defrag.
*
* @argc: the number of parameter.
* @argv[]: the pointer array of parameter.
*/
int main(int argc, char *argv[])
{
int opt;
int i, j, flags;
int arg_type;
int detail_tmp;
int success_flag;
char dir_name[PATH_MAX + 1];
struct stat64 buf;
i = 1;
flags = 0;
arg_type = -1;
detail_tmp = -1;
success_flag = 0;
/* Do not follow symlink */
flags |= FTW_PHYS;
/* Stay within the same filesystem */
flags |= FTW_MOUNT;
/* Parse arguments */
if (argc == 1 || (argc == 2 && argv[1][0] == '-'))
goto out;
current_uid = getuid();
while ((opt = getopt(argc, argv, "vc")) != EOF) {
switch (opt) {
case 'v':
detail_flag = 1;
i = 2;
break;
case 'c':
statistic_flag = 1;
i = 2;
break;
default:
goto out;
}
}
/* Main process */
for (; i < argc; i++) {
succeed_cnt = 0;
regular_count = 0;
total_count = 0;
frag_files_before_defrag = 0;
frag_files_after_defrag = 0;
extents_before_defrag = 0;
extents_after_defrag = 0;
defraged_file_count = 0;
files_block_count = 0;
memset(dir_name, 0, PATH_MAX + 1);
memset(lost_found_dir, 0, PATH_MAX + 1);
memset(sta_array, 0, sizeof(struct statistic_ino) * 5);
if (statistic_flag && i > 2)
printf("\n");
if (lstat64(argv[i], &buf) < 0) {
perror(NGMSG_FILE_INFO);
PRINT_FILE_NAME(argv[i]);
continue;
}
if (S_ISBLK(buf.st_mode)) {
/* Block device */
if (get_mount_point(argv[i], dir_name, PATH_MAX)
== RETURN_NG)
continue;
arg_type = DEVNAME;
if (!statistic_flag)
printf("ext4 defragmentation for device(%s)\n",
argv[i]);
} else if (S_ISDIR(buf.st_mode)) {
/* Directory */
if (access(argv[i], R_OK) < 0) {
perror(argv[i]);
continue;
}
arg_type = DIRNAME;
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;
}
/* For device case,
* filesystem type checked in get_mount_point()
*/
if (arg_type == FILENAME || arg_type == DIRNAME) {
if (is_ext4(argv[i]) == RETURN_NG)
continue;
if (realpath(argv[i], dir_name) == NULL) {
perror(NGMSG_REALPATH);
PRINT_FILE_NAME(argv[i]);
continue;
}
}
switch (arg_type) {
case DIRNAME:
if (!statistic_flag)
printf("ext4 defragmentation "
"for directory(%s)\n", argv[i]);
int mount_dir_len = 0;
mount_dir_len = strnlen(lost_found_dir, PATH_MAX);
strncat(lost_found_dir, "/lost+found",
PATH_MAX - strnlen(lost_found_dir, PATH_MAX));
/* Not the case("e4defrag mount_piont_dir") */
if (dir_name[mount_dir_len] != '\0') {
/* "e4defrag mount_piont_dir/lost+found"
* or "e4defrag mount_piont_dir/lost+found/"
*/
if (strncmp(lost_found_dir, dir_name,
strnlen(lost_found_dir,
PATH_MAX)) == 0 &&
(dir_name[strnlen(lost_found_dir,
PATH_MAX)] == '\0' ||
dir_name[strnlen(lost_found_dir,
PATH_MAX)] == '/')) {
PRINT_ERR_MSG(NGMSG_LOST_FOUND);
PRINT_FILE_NAME(argv[i]);
continue;
}
/* "e4defrag mount_piont_dir/else_dir" */
memset(lost_found_dir, 0, PATH_MAX + 1);
}
case DEVNAME:
if (arg_type == DEVNAME) {
strncpy(lost_found_dir, dir_name,
strnlen(dir_name, PATH_MAX));
strncat(lost_found_dir, "/lost+found/",
PATH_MAX - strnlen(lost_found_dir,
PATH_MAX));
}
nftw64(dir_name, calc_entry_counts, FTW_OPEN_FD, flags);
if (statistic_flag) {
if (detail_flag)
printf("%-40s%10s/%-10s%9s\n",
"<File>", "now", "best", "ratio");
nftw64(dir_name, statistic_fn,
FTW_OPEN_FD, flags);
if (succeed_cnt != 0) {
if (detail_flag)
printf("\n");
printf("%-40s%10s/%-10s%9s\n",
"<Fragmented files>", "now",
"best", "ratio");
for (j = 0; j <= 4; j++) {
if (strlen(sta_array[j].
msg_buffer) > 37) {
printf("%d. %s\n%50d/"
"%-10d%8.2f%%\n", j + 1,
sta_array[j].msg_buffer,
sta_array[j].now_count,
sta_array[j].best_count,
sta_array[j].ratio);
} else if (strlen(sta_array[j].
msg_buffer) > 0) {
printf("%d. %-37s%10d/"
"%-10d%8.2f%%\n", j + 1,
sta_array[j].msg_buffer,
sta_array[j].now_count,
sta_array[j].best_count,
sta_array[j].ratio);
} else
break;
}
}
break;
}
/* File tree walk */
nftw64(dir_name, ftw_fn, FTW_OPEN_FD, flags);
printf("\n\tSuccess:\t\t\t[ %u/%u ]\n", succeed_cnt,
total_count);
printf("\tFailure:\t\t\t[ %u/%u ]\n",
total_count - succeed_cnt, total_count);
if (detail_flag) {
printf("\tTotal extents:\t\t\t%4d->%d\n",
extents_before_defrag,
extents_after_defrag);
printf("\tFragmented percentage:\t\t"
"%3llu%%->%llu%%\n",
!regular_count ? 0 :
((unsigned long long)
frag_files_before_defrag * 100) /
regular_count,
!regular_count ? 0 :
((unsigned long long)
frag_files_after_defrag * 100) /
regular_count);
}
break;
case FILENAME:
total_count = 1;
regular_count = 1;
strncat(lost_found_dir, "/lost+found/",
PATH_MAX - strnlen(lost_found_dir,
PATH_MAX));
if (strncmp(lost_found_dir, dir_name,
strnlen(lost_found_dir,
PATH_MAX)) == 0) {
PRINT_ERR_MSG(NGMSG_LOST_FOUND);
PRINT_FILE_NAME(argv[i]);
continue;
}
if (statistic_flag) {
statistic_fn(argv[i], &buf, FTW_F, NULL);
break;
} else
printf("ext4 defragmentation for %s\n",
argv[i]);
/* Defrag single file process */
ftw_fn(argv[i], &buf, FTW_F, NULL);
if (succeed_cnt != 0)
printf(" Success:\t\t\t[1/1]\n");
else
printf(" Success:\t\t\t[0/1]\n");
break;
}
if (succeed_cnt != 0)
success_flag = 1;
if (statistic_flag) {
if (!succeed_cnt) {
if (detail_flag)
printf("\n");
if (arg_type == DEVNAME)
printf(" In this device(%s), "
"none can be defragmented.\n", argv[i]);
else if (arg_type == DIRNAME)
printf(" In this directory(%s), "
"none can be defragmented.\n", argv[i]);
else
printf(" This file(%s) "
"can't be defragmented.\n", argv[i]);
} else {
float files_ratio = 0.0;
float score = 0.0;
files_ratio = (float)(extents_before_defrag -
extents_after_defrag) *
100 / files_block_count;
score = CALC_SCORE(files_ratio);
printf("\n Total/best extents\t\t\t\t%d/%d\n"
" Fragmentation ratio\t\t\t\t%.2f%%\n"
" Fragmentation score\t\t\t\t%.2f\n",
extents_before_defrag,
extents_after_defrag,
files_ratio, score);
printf(" [0-30 no problem:"
" 31-55 a little bit fragmented:"
" 55- needs defrag]\n");
if (arg_type == DEVNAME)
printf(" This device(%s) ", argv[i]);
else if (arg_type == DIRNAME)
printf(" This directory(%s) ", argv[i]);
else
printf(" This file(%s) ", argv[i]);
if (score > DEFAULT_SCORE)
printf("needs defragmentation.\n");
else
printf("does not need "
"defragmentation.\n");
}
}
}
if (success_flag)
return RETURN_OK;
exit(1);
out:
printf(MSG_USAGE);
exit(1);
}
--
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