From: Akira Fujita Subject: [RFC][PATCH 8/8]ext4: online defrag command Date: Fri, 30 May 2008 20:18:38 +0900 Message-ID: <483FE28E.9020208@rs.jp.nec.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-2022-JP Content-Transfer-Encoding: 7bit Cc: Akira Fujita To: linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, Theodore Tso , Mingming Cao Return-path: Received: from TYO201.gate.nec.co.jp ([202.32.8.193]:33292 "EHLO tyo201.gate.nec.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750822AbYE3LXv (ORCPT ); Fri, 30 May 2008 07:23:51 -0400 Sender: linux-ext4-owner@vger.kernel.org List-ID: ext4: online defrag-- Online defrag command From: Akira Fujita - The defrag command. Usage is as follows: - Put the multiple files closer together. # e4defrag -r directory-name - Defrag for free space fragmentation. # e4defrag -f file-name - Defrag for a single file. # e4defrag file-name - Defrag for all files on ext4. # e4defrag device-name Signed-off-by: Akira Fujita Signed-off-by: Takashi Sato --- /* * e4defrag.c - ext4 filesystem defragmenter * * Copyright (C) 2008 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 #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', 8) #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 */ typedef unsigned long long ext4_fsblk_t; /* data type for file logical block number */ typedef unsigned int ext4_lblk_t; /* data type for block offset of block group */ typedef int ext4_grpblk_t; /* 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_LOST_FOUND "\te4defrag : Can not process \"lost+found\"." #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." #define NGMSG_FORCE_DEFRAG_SIZE \ "\te4defrag : Cannot specify a file larger than %luMB in force defrag mode." struct ext4_extent_data { ext4_lblk_t 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_lblk_t start_offset; /* start offset to defrag in blocks */ ext4_lblk_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 */ ext4_lblk_t f_offset; /* file offset */ ext4_grpblk_t g_offset; /* group 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; char lost_found_dir[PATH_MAX + 1]; 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 (lost_found_dir[0] != '\0' && !memcmp(file, lost_found_dir, strnlen(lost_found_dir, PATH_MAX))) { if (detail_flag) { PRINT_ERR_MSG(NGMSG_LOST_FOUND); PRINT_FILE_NAME(file); } return FTW_CONT; } if (flag != FTW_F) goto out; amount_cnt++; fd = open64(file, O_RDONLY); if (fd < 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; else df_data.flag = 0; /* 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; } /* Go into force defrag mode */ if (defraged_size < 0 && force_flag == 1 && errno == ENOSPC) { /* * File size is larger than max size of * force defrag mode */ if (buf->st_size > MAX_FILE_SIZE) { fprintf(stderr, NGMSG_FORCE_DEFRAG_SIZE, (MAX_FILE_SIZE) / (1024 * 1024)); close(fd); return FTW_CONT; } 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 = (long long)df_data.start_offset * blocksize; /* print process progress */ 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++; out: if (flag != FTW_F && 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 + 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; } 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); strncpy(lost_found_dir, mnt->mnt_dir, PATH_MAX); } } } 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 + 1]; 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 + 1); memset(lost_found_dir, 0, PATH_MAX + 1); 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 defrag 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; if (realpath(argv[i], dir_name) == NULL) { perror(NGMSG_REALPATH); PRINT_FILE_NAME(argv[i]); continue; } } switch (arg_type) { case DIRNAME: printf("Start defragment 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)); } /* 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: 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 (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, ext4_fsblk_t bstart, ext4_fsblk_t bend) { struct ext4_extents_info extents_info; unsigned long long inode; int pos = 0; int ret = 0; 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 != ENOMEM) continue; else 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 || errno == ESTALE) 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) { ext4_grpblk_t 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.g_offset) break; if (i < DEFRAG_MAX_ENT) break; /* Record the offset of logical block number this time */ pos = extents_info.g_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 defrag 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; }