From: Akira Fujita Subject: [RFC][PATCH 3/3] ext4: Ext4 online defrag command Date: Fri, 30 Jan 2009 15:14:15 +0900 Message-ID: <49829AB7.9020609@rs.jp.nec.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-2022-JP Content-Transfer-Encoding: 7bit Cc: linux-fsdevel@vger.kernel.org To: Theodore Tso , linux-ext4@vger.kernel.org Return-path: Received: from TYO202.gate.nec.co.jp ([202.32.8.206]:40965 "EHLO tyo202.gate.nec.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751379AbZA3GQR (ORCPT ); Fri, 30 Jan 2009 01:16:17 -0500 Sender: linux-ext4-owner@vger.kernel.org List-ID: ext4: online defrag -- Ext4 online defrag command From: Akira Fujita - 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 Signed-off-by: Takashi Sato --- /* * e4defrag.c - ext4 filesystem defragmenter * * Copyright (C) 2009 NEC Software Tohoku, Ltd. * * Author: Akira Fujita * Takashi Sato */ #ifndef _LARGEFILE_SOURCE #define _LARGEFILE_SOURCE #endif #ifndef _LARGEFILE64_SOURCE #define _LARGEFILE64_SOURCE #endif #define _XOPEN_SOURCE 500 #define _GNU_SOURCE #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* 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("\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", "", "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", "", "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", "", "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); }