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* nilfs2_fs.h - NILFS2 on-disk structures and common declarations.
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* Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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* Written by Koji Sato <koji@osrg.net>
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* Ryusuke Konishi <ryusuke@osrg.net>
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* linux/include/linux/ext2_fs.h
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* Copyright (C) 1992, 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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* linux/include/linux/minix_fs.h
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* Copyright (C) 1991, 1992 Linus Torvalds
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#ifndef _LINUX_NILFS_FS_H
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#define _LINUX_NILFS_FS_H
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#include <linux/types.h>
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#include <linux/ioctl.h>
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#include <linux/magic.h>
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#define NILFS_INODE_BMAP_SIZE 7
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* struct nilfs_inode - structure of an inode on disk
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* @i_blocks: blocks count
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* @i_size: size in bytes
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* @i_ctime: creation time (seconds)
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* @i_mtime: modification time (seconds)
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* @i_ctime_nsec: creation time (nano seconds)
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* @i_mtime_nsec: modification time (nano seconds)
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* @i_links_count: links count
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* @i_flags: file flags
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* @i_bmap: block mapping
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* @i_xattr: extended attributes
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* @i_generation: file generation (for NFS)
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__le64 i_bmap[NILFS_INODE_BMAP_SIZE];
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#define i_device_code i_bmap[0]
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* struct nilfs_super_root - structure of super root
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* @sr_bytes: byte count of the structure
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* @sr_flags: flags (reserved)
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* @sr_nongc_ctime: write time of the last segment not for cleaner operation
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* @sr_dat: DAT file inode
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* @sr_cpfile: checkpoint file inode
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* @sr_sufile: segment usage file inode
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struct nilfs_super_root {
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__le64 sr_nongc_ctime;
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struct nilfs_inode sr_dat;
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struct nilfs_inode sr_cpfile;
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struct nilfs_inode sr_sufile;
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#define NILFS_SR_MDT_OFFSET(inode_size, i) \
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((unsigned long)&((struct nilfs_super_root *)0)->sr_dat + \
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#define NILFS_SR_DAT_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 0)
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#define NILFS_SR_CPFILE_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 1)
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#define NILFS_SR_SUFILE_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 2)
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#define NILFS_SR_BYTES(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 3)
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* Maximal mount counts
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#define NILFS_DFL_MAX_MNT_COUNT 50 /* 50 mounts */
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* File system states (sbp->s_state, nilfs->ns_mount_state)
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#define NILFS_VALID_FS 0x0001 /* Unmounted cleanly */
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#define NILFS_ERROR_FS 0x0002 /* Errors detected */
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#define NILFS_RESIZE_FS 0x0004 /* Resize required */
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* Mount flags (sbi->s_mount_opt)
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#define NILFS_MOUNT_ERROR_MODE 0x0070 /* Error mode mask */
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#define NILFS_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */
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#define NILFS_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */
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#define NILFS_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */
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#define NILFS_MOUNT_BARRIER 0x1000 /* Use block barriers */
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#define NILFS_MOUNT_STRICT_ORDER 0x2000 /* Apply strict in-order
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semantics also for data */
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#define NILFS_MOUNT_NORECOVERY 0x4000 /* Disable write access during
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mount-time recovery */
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#define NILFS_MOUNT_DISCARD 0x8000 /* Issue DISCARD requests */
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* struct nilfs_super_block - structure of super block on disk
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struct nilfs_super_block {
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/*00*/ __le32 s_rev_level; /* Revision level */
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__le16 s_minor_rev_level; /* minor revision level */
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__le16 s_magic; /* Magic signature */
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__le16 s_bytes; /* Bytes count of CRC calculation
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for this structure. s_reserved
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__le16 s_flags; /* flags */
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__le32 s_crc_seed; /* Seed value of CRC calculation */
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/*10*/ __le32 s_sum; /* Check sum of super block */
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__le32 s_log_block_size; /* Block size represented as follows
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1 << (s_log_block_size + 10) */
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__le64 s_nsegments; /* Number of segments in filesystem */
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/*20*/ __le64 s_dev_size; /* block device size in bytes */
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__le64 s_first_data_block; /* 1st seg disk block number */
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/*30*/ __le32 s_blocks_per_segment; /* number of blocks per full segment */
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__le32 s_r_segments_percentage; /* Reserved segments percentage */
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__le64 s_last_cno; /* Last checkpoint number */
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/*40*/ __le64 s_last_pseg; /* disk block addr pseg written last */
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__le64 s_last_seq; /* seq. number of seg written last */
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/*50*/ __le64 s_free_blocks_count; /* Free blocks count */
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__le64 s_ctime; /* Creation time (execution time of
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/*60*/ __le64 s_mtime; /* Mount time */
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__le64 s_wtime; /* Write time */
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/*70*/ __le16 s_mnt_count; /* Mount count */
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__le16 s_max_mnt_count; /* Maximal mount count */
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__le16 s_state; /* File system state */
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__le16 s_errors; /* Behaviour when detecting errors */
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__le64 s_lastcheck; /* time of last check */
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/*80*/ __le32 s_checkinterval; /* max. time between checks */
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__le32 s_creator_os; /* OS */
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__le16 s_def_resuid; /* Default uid for reserved blocks */
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__le16 s_def_resgid; /* Default gid for reserved blocks */
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__le32 s_first_ino; /* First non-reserved inode */
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/*90*/ __le16 s_inode_size; /* Size of an inode */
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__le16 s_dat_entry_size; /* Size of a dat entry */
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__le16 s_checkpoint_size; /* Size of a checkpoint */
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__le16 s_segment_usage_size; /* Size of a segment usage */
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/*98*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
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/*A8*/ char s_volume_name[80]; /* volume name */
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/*F8*/ __le32 s_c_interval; /* Commit interval of segment */
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__le32 s_c_block_max; /* Threshold of data amount for
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the segment construction */
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/*100*/ __le64 s_feature_compat; /* Compatible feature set */
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__le64 s_feature_compat_ro; /* Read-only compatible feature set */
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__le64 s_feature_incompat; /* Incompatible feature set */
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__u32 s_reserved[186]; /* padding to the end of the block */
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* Codes for operating systems
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#define NILFS_OS_LINUX 0
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/* Codes from 1 to 4 are reserved to keep compatibility with ext2 creator-OS */
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#define NILFS_CURRENT_REV 2 /* current major revision */
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#define NILFS_MINOR_REV 0 /* minor revision */
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#define NILFS_MIN_SUPP_REV 2 /* minimum supported revision */
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* Feature set definitions
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* If there is a bit set in the incompatible feature set that the kernel
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* doesn't know about, it should refuse to mount the filesystem.
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#define NILFS_FEATURE_COMPAT_RO_BLOCK_COUNT 0x00000001ULL
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#define NILFS_FEATURE_COMPAT_SUPP 0ULL
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#define NILFS_FEATURE_COMPAT_RO_SUPP NILFS_FEATURE_COMPAT_RO_BLOCK_COUNT
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#define NILFS_FEATURE_INCOMPAT_SUPP 0ULL
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* Bytes count of super_block for CRC-calculation
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#define NILFS_SB_BYTES \
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((long)&((struct nilfs_super_block *)0)->s_reserved)
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* Special inode number
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#define NILFS_ROOT_INO 2 /* Root file inode */
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#define NILFS_DAT_INO 3 /* DAT file */
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#define NILFS_CPFILE_INO 4 /* checkpoint file */
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#define NILFS_SUFILE_INO 5 /* segment usage file */
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#define NILFS_IFILE_INO 6 /* ifile */
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#define NILFS_ATIME_INO 7 /* Atime file (reserved) */
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#define NILFS_XATTR_INO 8 /* Xattribute file (reserved) */
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#define NILFS_SKETCH_INO 10 /* Sketch file */
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#define NILFS_USER_INO 11 /* Fisrt user's file inode number */
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#define NILFS_SB_OFFSET_BYTES 1024 /* byte offset of nilfs superblock */
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#define NILFS_SEG_MIN_BLOCKS 16 /* Minimum number of blocks in
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#define NILFS_PSEG_MIN_BLOCKS 2 /* Minimum number of blocks in
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#define NILFS_MIN_NRSVSEGS 8 /* Minimum number of reserved
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* We call DAT, cpfile, and sufile root metadata files. Inodes of
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* these files are written in super root block instead of ifile, and
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* garbage collector doesn't keep any past versions of these files.
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#define NILFS_ROOT_METADATA_FILE(ino) \
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((ino) >= NILFS_DAT_INO && (ino) <= NILFS_SUFILE_INO)
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* bytes offset of secondary super block
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#define NILFS_SB2_OFFSET_BYTES(devsize) ((((devsize) >> 12) - 1) << 12)
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* Maximal count of links to a file
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#define NILFS_LINK_MAX 32000
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* Structure of a directory entry
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#define NILFS_NAME_LEN 255
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* Block size limitations
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#define NILFS_MIN_BLOCK_SIZE 1024
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#define NILFS_MAX_BLOCK_SIZE 65536
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* The new version of the directory entry. Since V0 structures are
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* stored in intel byte order, and the name_len field could never be
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* bigger than 255 chars, it's safe to reclaim the extra byte for the
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struct nilfs_dir_entry {
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__le64 inode; /* Inode number */
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__le16 rec_len; /* Directory entry length */
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__u8 name_len; /* Name length */
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char name[NILFS_NAME_LEN]; /* File name */
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* NILFS directory file types. Only the low 3 bits are used. The
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* other bits are reserved for now.
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* NILFS_DIR_PAD defines the directory entries boundaries
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* NOTE: It must be a multiple of 8
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#define NILFS_DIR_PAD 8
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#define NILFS_DIR_ROUND (NILFS_DIR_PAD - 1)
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#define NILFS_DIR_REC_LEN(name_len) (((name_len) + 12 + NILFS_DIR_ROUND) & \
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#define NILFS_MAX_REC_LEN ((1<<16)-1)
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static inline unsigned nilfs_rec_len_from_disk(__le16 dlen)
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unsigned len = le16_to_cpu(dlen);
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#if !defined(__KERNEL__) || (PAGE_CACHE_SIZE >= 65536)
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if (len == NILFS_MAX_REC_LEN)
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static inline __le16 nilfs_rec_len_to_disk(unsigned len)
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#if !defined(__KERNEL__) || (PAGE_CACHE_SIZE >= 65536)
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if (len == (1 << 16))
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return cpu_to_le16(NILFS_MAX_REC_LEN);
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else if (len > (1 << 16))
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return cpu_to_le16(len);
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* struct nilfs_finfo - file information
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* @fi_ino: inode number
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* @fi_cno: checkpoint number
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* @fi_nblocks: number of blocks (including intermediate blocks)
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* @fi_ndatablk: number of file data blocks
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/* array of virtual block numbers */
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* struct nilfs_binfo_v - information for the block to which a virtual block number is assigned
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* @bi_vblocknr: virtual block number
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* @bi_blkoff: block offset
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struct nilfs_binfo_v {
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* struct nilfs_binfo_dat - information for the block which belongs to the DAT file
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* @bi_blkoff: block offset
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struct nilfs_binfo_dat {
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* union nilfs_binfo: block information
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* @bi_v: nilfs_binfo_v structure
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* @bi_dat: nilfs_binfo_dat structure
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struct nilfs_binfo_v bi_v;
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struct nilfs_binfo_dat bi_dat;
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* struct nilfs_segment_summary - segment summary
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* @ss_datasum: checksum of data
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* @ss_sumsum: checksum of segment summary
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* @ss_magic: magic number
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* @ss_bytes: size of this structure in bytes
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* @ss_seq: sequence number
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* @ss_create: creation timestamp
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* @ss_next: next segment
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* @ss_nblocks: number of blocks
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* @ss_nfinfo: number of finfo structures
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* @ss_sumbytes: total size of segment summary in bytes
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* @ss_cno: checkpoint number
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struct nilfs_segment_summary {
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/* array of finfo structures */
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#define NILFS_SEGSUM_MAGIC 0x1eaffa11 /* segment summary magic number */
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* Segment summary flags
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#define NILFS_SS_LOGBGN 0x0001 /* begins a logical segment */
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#define NILFS_SS_LOGEND 0x0002 /* ends a logical segment */
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#define NILFS_SS_SR 0x0004 /* has super root */
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#define NILFS_SS_SYNDT 0x0008 /* includes data only updates */
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#define NILFS_SS_GC 0x0010 /* segment written for cleaner operation */
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* struct nilfs_btree_node - B-tree node
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* @bn_nchildren: number of children
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struct nilfs_btree_node {
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#define NILFS_BTREE_NODE_ROOT 0x01
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#define NILFS_BTREE_LEVEL_DATA 0
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#define NILFS_BTREE_LEVEL_NODE_MIN (NILFS_BTREE_LEVEL_DATA + 1)
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#define NILFS_BTREE_LEVEL_MAX 14
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* struct nilfs_palloc_group_desc - block group descriptor
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* @pg_nfrees: number of free entries in block group
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struct nilfs_palloc_group_desc {
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* struct nilfs_dat_entry - disk address translation entry
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* @de_blocknr: block number
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* @de_start: start checkpoint number
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* @de_end: end checkpoint number
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* @de_rsv: reserved for future use
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struct nilfs_dat_entry {
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* struct nilfs_snapshot_list - snapshot list
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* @ssl_next: next checkpoint number on snapshot list
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* @ssl_prev: previous checkpoint number on snapshot list
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struct nilfs_snapshot_list {
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* struct nilfs_checkpoint - checkpoint structure
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* @cp_checkpoints_count: checkpoints count in a block
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* @cp_snapshot_list: snapshot list
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* @cp_cno: checkpoint number
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* @cp_create: creation timestamp
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* @cp_nblk_inc: number of blocks incremented by this checkpoint
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* @cp_inodes_count: inodes count
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* @cp_blocks_count: blocks count
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* @cp_ifile_inode: inode of ifile
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struct nilfs_checkpoint {
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__le32 cp_checkpoints_count;
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struct nilfs_snapshot_list cp_snapshot_list;
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__le64 cp_inodes_count;
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__le64 cp_blocks_count;
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/* Do not change the byte offset of ifile inode.
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To keep the compatibility of the disk format,
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additional fields should be added behind cp_ifile_inode. */
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struct nilfs_inode cp_ifile_inode;
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/* checkpoint flags */
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NILFS_CHECKPOINT_SNAPSHOT,
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NILFS_CHECKPOINT_INVALID,
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NILFS_CHECKPOINT_SKETCH,
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NILFS_CHECKPOINT_MINOR,
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#define NILFS_CHECKPOINT_FNS(flag, name) \
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nilfs_checkpoint_set_##name(struct nilfs_checkpoint *cp) \
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cp->cp_flags = cpu_to_le32(le32_to_cpu(cp->cp_flags) | \
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(1UL << NILFS_CHECKPOINT_##flag)); \
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nilfs_checkpoint_clear_##name(struct nilfs_checkpoint *cp) \
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cp->cp_flags = cpu_to_le32(le32_to_cpu(cp->cp_flags) & \
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~(1UL << NILFS_CHECKPOINT_##flag)); \
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nilfs_checkpoint_##name(const struct nilfs_checkpoint *cp) \
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return !!(le32_to_cpu(cp->cp_flags) & \
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(1UL << NILFS_CHECKPOINT_##flag)); \
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NILFS_CHECKPOINT_FNS(SNAPSHOT, snapshot)
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NILFS_CHECKPOINT_FNS(INVALID, invalid)
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NILFS_CHECKPOINT_FNS(MINOR, minor)
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* struct nilfs_cpinfo - checkpoint information
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* @ci_cno: checkpoint number
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* @ci_create: creation timestamp
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* @ci_nblk_inc: number of blocks incremented by this checkpoint
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* @ci_inodes_count: inodes count
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* @ci_blocks_count: blocks count
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* @ci_next: next checkpoint number in snapshot list
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struct nilfs_cpinfo {
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__u64 ci_inodes_count;
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__u64 ci_blocks_count;
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#define NILFS_CPINFO_FNS(flag, name) \
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nilfs_cpinfo_##name(const struct nilfs_cpinfo *cpinfo) \
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return !!(cpinfo->ci_flags & (1UL << NILFS_CHECKPOINT_##flag)); \
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NILFS_CPINFO_FNS(SNAPSHOT, snapshot)
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NILFS_CPINFO_FNS(INVALID, invalid)
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NILFS_CPINFO_FNS(MINOR, minor)
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* struct nilfs_cpfile_header - checkpoint file header
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* @ch_ncheckpoints: number of checkpoints
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* @ch_nsnapshots: number of snapshots
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* @ch_snapshot_list: snapshot list
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struct nilfs_cpfile_header {
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__le64 ch_ncheckpoints;
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__le64 ch_nsnapshots;
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struct nilfs_snapshot_list ch_snapshot_list;
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#define NILFS_CPFILE_FIRST_CHECKPOINT_OFFSET \
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((sizeof(struct nilfs_cpfile_header) + \
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sizeof(struct nilfs_checkpoint) - 1) / \
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sizeof(struct nilfs_checkpoint))
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* struct nilfs_segment_usage - segment usage
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* @su_lastmod: last modified timestamp
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* @su_nblocks: number of blocks in segment
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struct nilfs_segment_usage {
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/* segment usage flag */
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NILFS_SEGMENT_USAGE_ACTIVE,
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NILFS_SEGMENT_USAGE_DIRTY,
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NILFS_SEGMENT_USAGE_ERROR,
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#define NILFS_SEGMENT_USAGE_FNS(flag, name) \
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nilfs_segment_usage_set_##name(struct nilfs_segment_usage *su) \
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su->su_flags = cpu_to_le32(le32_to_cpu(su->su_flags) | \
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(1UL << NILFS_SEGMENT_USAGE_##flag));\
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nilfs_segment_usage_clear_##name(struct nilfs_segment_usage *su) \
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cpu_to_le32(le32_to_cpu(su->su_flags) & \
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~(1UL << NILFS_SEGMENT_USAGE_##flag)); \
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nilfs_segment_usage_##name(const struct nilfs_segment_usage *su) \
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return !!(le32_to_cpu(su->su_flags) & \
644
(1UL << NILFS_SEGMENT_USAGE_##flag)); \
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NILFS_SEGMENT_USAGE_FNS(ACTIVE, active)
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NILFS_SEGMENT_USAGE_FNS(DIRTY, dirty)
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NILFS_SEGMENT_USAGE_FNS(ERROR, error)
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nilfs_segment_usage_set_clean(struct nilfs_segment_usage *su)
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su->su_lastmod = cpu_to_le64(0);
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su->su_nblocks = cpu_to_le32(0);
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su->su_flags = cpu_to_le32(0);
660
nilfs_segment_usage_clean(const struct nilfs_segment_usage *su)
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return !le32_to_cpu(su->su_flags);
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* struct nilfs_sufile_header - segment usage file header
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* @sh_ncleansegs: number of clean segments
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* @sh_ndirtysegs: number of dirty segments
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* @sh_last_alloc: last allocated segment number
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struct nilfs_sufile_header {
672
__le64 sh_ncleansegs;
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__le64 sh_ndirtysegs;
674
__le64 sh_last_alloc;
678
#define NILFS_SUFILE_FIRST_SEGMENT_USAGE_OFFSET \
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((sizeof(struct nilfs_sufile_header) + \
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sizeof(struct nilfs_segment_usage) - 1) / \
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sizeof(struct nilfs_segment_usage))
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* nilfs_suinfo - segment usage information
689
struct nilfs_suinfo {
695
#define NILFS_SUINFO_FNS(flag, name) \
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nilfs_suinfo_##name(const struct nilfs_suinfo *si) \
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return si->sui_flags & (1UL << NILFS_SEGMENT_USAGE_##flag); \
702
NILFS_SUINFO_FNS(ACTIVE, active)
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NILFS_SUINFO_FNS(DIRTY, dirty)
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NILFS_SUINFO_FNS(ERROR, error)
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static inline int nilfs_suinfo_clean(const struct nilfs_suinfo *si)
708
return !si->sui_flags;
718
* struct nilfs_cpmode -
722
struct nilfs_cpmode {
729
* struct nilfs_argv - argument vector
738
__u32 v_nmembs; /* number of members */
739
__u16 v_size; /* size of members */
745
* struct nilfs_period -
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struct nilfs_period {
755
* struct nilfs_cpstat -
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* @cs_cno: checkpoint number
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* @cs_ncps: number of checkpoints
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* @cs_nsss: number of snapshots
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struct nilfs_cpstat {
767
* struct nilfs_sustat -
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* @ss_nsegs: number of segments
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* @ss_ncleansegs: number of clean segments
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* @ss_ndirtysegs: number of dirty segments
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* @ss_ctime: creation time of the last segment
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* @ss_nongc_ctime: creation time of the last segment not for GC
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* @ss_prot_seq: least sequence number of segments which must not be reclaimed
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struct nilfs_sustat {
780
__u64 ss_nongc_ctime;
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* struct nilfs_vinfo - virtual block number information
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* struct nilfs_vdesc -
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struct nilfs_period vd_period;
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* struct nilfs_bdesc -
824
#define NILFS_IOCTL_IDENT 'n'
826
#define NILFS_IOCTL_CHANGE_CPMODE \
827
_IOW(NILFS_IOCTL_IDENT, 0x80, struct nilfs_cpmode)
828
#define NILFS_IOCTL_DELETE_CHECKPOINT \
829
_IOW(NILFS_IOCTL_IDENT, 0x81, __u64)
830
#define NILFS_IOCTL_GET_CPINFO \
831
_IOR(NILFS_IOCTL_IDENT, 0x82, struct nilfs_argv)
832
#define NILFS_IOCTL_GET_CPSTAT \
833
_IOR(NILFS_IOCTL_IDENT, 0x83, struct nilfs_cpstat)
834
#define NILFS_IOCTL_GET_SUINFO \
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_IOR(NILFS_IOCTL_IDENT, 0x84, struct nilfs_argv)
836
#define NILFS_IOCTL_GET_SUSTAT \
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_IOR(NILFS_IOCTL_IDENT, 0x85, struct nilfs_sustat)
838
#define NILFS_IOCTL_GET_VINFO \
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_IOWR(NILFS_IOCTL_IDENT, 0x86, struct nilfs_argv)
840
#define NILFS_IOCTL_GET_BDESCS \
841
_IOWR(NILFS_IOCTL_IDENT, 0x87, struct nilfs_argv)
842
#define NILFS_IOCTL_CLEAN_SEGMENTS \
843
_IOW(NILFS_IOCTL_IDENT, 0x88, struct nilfs_argv[5])
844
#define NILFS_IOCTL_SYNC \
845
_IOR(NILFS_IOCTL_IDENT, 0x8A, __u64)
846
#define NILFS_IOCTL_RESIZE \
847
_IOW(NILFS_IOCTL_IDENT, 0x8B, __u64)
848
#define NILFS_IOCTL_SET_ALLOC_RANGE \
849
_IOW(NILFS_IOCTL_IDENT, 0x8C, __u64[2])
851
#endif /* _LINUX_NILFS_FS_H */