DEBUGFS(8) System Manager's Manual DEBUGFS(8) debugfs - ext2/ext3/ext4 debugfs [ -DVwcin ] [ -b _ ] [ -s _ ] [ -f _ ] [ -R ] [ -d __ ] [ -z _ ] [ ] debugfs . ext2 ext3 ext4. ( /dev/sdXX) . -w -. . -n . e2fsprogs. -c . . -i ext2 e2image. ext2 debugfs . : debugfs ls dump __ -d. debugfs . ! -d __ -i __ ext2. . -b _ () . ( / .) -s _ ( 1024 ). -s -b. ( / .) -f _ debugfs _ . debugfs . -D debugfs / . Linux / . -R debugfs . -V debugfs . -z _ . e2undo(8) . undo_file debugfs-device.e2undo E2FSPROGS_UNDO_DIR. : . debugfs filespec ( ) debugfs. filespec . <2>. ('/') debugfs. debugfs. debugfs cd. debugfs. blocks filespec filespec stdout. bmap [ -a ] filespec logical_block [physical_block] logical_block filespec. -a . block_dump '[ -x ] [-f filespec] block_num block_num ASCII . -f filespec . -x . cat filespec filespec stdout. cd filespec filespec. chroot filespec filespec. close [-a] . -a . clri filespec - i filespec. copy_inode source_inode destination_inode - i source_inode - i destination_inode. dirsearch filespec filename filespec filename. dirty [-clean] . -clean. dump [-p] filespec out_file - i filespec out_file. -p out_file filespec. dump_mmp [mmp_block] (mmp). mmp_block MMP s_mmp_block MMP . dx_hash [-cv] [-h hash_alg] [-s hash_seed] filename filename. -c . -v dx_hash . -h -s. -h legacy half_md4 tea. -s UUID. dump_extents [-n] [-l] filespec - i filespec. -n dump_extents . -l dump_extents . ( . .) dump_unused . ea_get [-f outfile]|[-xVC] [-r] filespec attr_name attr_name filespec stdout outfile. ea_list _ _ . ea_set [-f _] [-r] _ _ _ _ _ _ _. ea_rm _ _... _ _. expand_dir _ _. fallocate _ _ [_] _ _ _ . _ . . feature [__] [-__] ... . . filefrag [-dvr] _ _. _ -d filefrag . -v filefrag . -r filefrag . find_free_block [ []] . ffb. find_free_inode [ []] . . . ( .) ffi. freeb [] . . freefrag [-c chunk_kb] . -c filefrag chunk_kb . 2 . freei filespec [num] filespec. num num-1 . get_quota quota_type id ( ) . help debugfs. htree_dump filespec filespec . icheck block ... . inode_dump [-b]|[-e]|[-x] filespec ASCII. -b i_blocks . -e . -x . . imap filespec ( ) filespec. init_filesys device blocksize ext2 device blocksize. mke2fs(8). . journal_close . journal_open [-c] [-v ver] [-f ext_jnl] . -c 2 3 -v. ext_jnl. journal_run . journal_write [-b blocks] [-r revoke] [-c] file . blocks file. revoke. -c . kill_file filespec filespec . ( ) . rm(1) . lcd directory debugfs directory . list_quota quota_type ( ). ln filespec dest_file dest_file filespec. . logdump [-acsOS] [-b block] [-n num_trans ] [-i filespec] [-f journal_file] [output_file] ext3. . -i filespec. -f. -s . -S logdump . -a logdump . -b logdump . -c -a -b. -O logdump (). . -n logdump . num_trans . ls [-l] [-c] [-d] [-p] [-r] filespec filespec. -c ( ). -d . -l . -p . -r . list_deleted_inodes [] . lsdel. ext2. ext3 ext4 . modify_inode _ _. mi. mkdir _ . mknod _ [p|[[c|b] ]] ( ). . ncheck [-c] __ ... . -c . open [-weficD] [-b _] [-d __] [-s _] [-z _] . -f . -e . -b -c -d -i -s -w -D debugfs. orphan_inodes . punch _ _ [_] _ _. _ _ . symlink _ . pwd . quit debugfs rdump [...] ( ) . rm _ _. _ . unlink(). rmdir _ _. setb [] . . set_block_group _ _ . set_bg. set_current_time . seti _ [] _ . -1 . set_inode_field _ _ . : set_inode_field -l sif. set_mmp_value (MMP) MMP field value. MMP : set_mmp_value -l smmp. set_super_value field value field value. : set_super_value -l ssv. show_debugfs_params debugfs . show_super_stats [-h] . -h . stats. stat filespec inode filespec. supported_features debugfs. testb block [count] block . count count block. testi filespec filespec . undel [pathname] ( ) . e2fsck undel . . debugfs link e2fsck lost+found. unlink pathname pathname . . write source_file out_file source_file out_file. zap_block [-f filespec] [-o offset] [-l length] [-p pattern] block_num block_num (NUL) -p pattern. -f block_num filespec. -o -l offset length . zap_block [-f filespec] [-b bit] block_num block_num . -f block_num filespec. DEBUGFS_PAGER, PAGER debugfs (pager). : show_super_stats (stats) list_directory (ls) show_inode_info (stat) list_deleted_inodes (lsdel) htree_dump. DEBUGFS_PAGER PAGER. less(1) . less(1) DEBUGFS_PAGER PAGER. debugfs Theodore Ts'o . dumpe2fs(8), tune2fs(8), e2fsck(8), mke2fs(8), ext4(5) 3 . . : . E2fsprogs 1.47.4 2025 DEBUGFS(8)