f2fs: Pull in from upstream 3.13 kernel
Merge tag 'for-3.8-merge' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs
Pull new F2FS filesystem from Jaegeuk Kim:
"Introduce a new file system, Flash-Friendly File System (F2FS), to
Linux 3.8.
Highlights:
- Add initial f2fs source codes
- Fix an endian conversion bug
- Fix build failures on random configs
- Fix the power-off-recovery routine
- Minor cleanup, coding style, and typos patches"
From the Kconfig help text:
F2FS is based on Log-structured File System (LFS), which supports
versatile "flash-friendly" features. The design has been focused on
addressing the fundamental issues in LFS, which are snowball effect
of wandering tree and high cleaning overhead.
Since flash-based storages show different characteristics according to
the internal geometry or flash memory management schemes aka FTL, F2FS
and tools support various parameters not only for configuring on-disk
layout, but also for selecting allocation and cleaning algorithms.
and there's an article by Neil Brown about it on lwn.net:
http://lwn.net/Articles/518988/
* tag 'for-3.8-merge' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs: (36 commits)
f2fs: fix tracking parent inode number
f2fs: cleanup the f2fs_bio_alloc routine
f2fs: introduce accessor to retrieve number of dentry slots
f2fs: remove redundant call to f2fs_put_page in delete entry
f2fs: make use of GFP_F2FS_ZERO for setting gfp_mask
f2fs: rewrite f2fs_bio_alloc to make it simpler
f2fs: fix a typo in f2fs documentation
f2fs: remove unused variable
f2fs: move error condition for mkdir at proper place
f2fs: remove unneeded initialization
f2fs: check read only condition before beginning write out
f2fs: remove unneeded memset from init_once
f2fs: show error in case of invalid mount arguments
f2fs: fix the compiler warning for uninitialized use of variable
f2fs: resolve build failures
f2fs: adjust kernel coding style
f2fs: fix endian conversion bugs reported by sparse
f2fs: remove unneeded version.h header file from f2fs.h
f2fs: update the f2fs document
f2fs: update Kconfig and Makefile
...
Conflicts:
include/uapi/linux/magic.h
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs
Pull f2fs bug fixes from Jaegeuk Kim:
"This patch-set includes two major bug fixes:
- incorrect IUsed provided by *df -i*, and
- lookup failure of parent inodes in corner cases.
[Other Bug Fixes]
- Fix error handling routines
- Trigger recovery process correctly
- Resolve build failures due to missing header files
[Etc]
- Add a MAINTAINERS entry for f2fs
- Fix and clean up variables, functions, and equations
- Avoid warnings during compilation"
* tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs:
f2fs: unify string length declarations and usage
f2fs: clean up unused variables and return values
f2fs: clean up the start_bidx_of_node function
f2fs: remove unneeded variable from f2fs_sync_fs
f2fs: fix fsync_inode list addition logic and avoid invalid access to memory
f2fs: remove unneeded initialization of nr_dirty in dirty_seglist_info
f2fs: handle error from f2fs_iget_nowait
f2fs: fix equation of has_not_enough_free_secs()
f2fs: add MAINTAINERS entry
f2fs: return a default value for non-void function
f2fs: invalidate the node page if allocation is failed
f2fs: add missing #include <linux/prefetch.h>
f2fs: do f2fs_balance_fs in front of dir operations
f2fs: should recover orphan and fsync data
f2fs: fix handling errors got by f2fs_write_inode
f2fs: fix up f2fs_get_parent issue to retrieve correct parent inode number
f2fs: fix wrong calculation on f_files in statfs
f2fs: remove set_page_dirty for atomic f2fs_end_io_write
Merge tag 'f2fs-for-3.8-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs
Pull f2fs fixes from Jaegeuk Kim:
o Support swap file and link generic_file_remap_pages
o Enhance the bio streaming flow and free section control
o Major bug fix on recovery routine
o Minor bug/warning fixes and code cleanups
* tag 'f2fs-for-3.8-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs: (22 commits)
f2fs: use _safe() version of list_for_each
f2fs: add comments of start_bidx_of_node
f2fs: avoid issuing small bios due to several dirty node pages
f2fs: support swapfile
f2fs: add remap_pages as generic_file_remap_pages
f2fs: add __init to functions in init_f2fs_fs
f2fs: fix the debugfs entry creation path
f2fs: add global mutex_lock to protect f2fs_stat_list
f2fs: remove the blk_plug usage in f2fs_write_data_pages
f2fs: avoid redundant time update for parent directory in f2fs_delete_entry
f2fs: remove redundant call to set_blocksize in f2fs_fill_super
f2fs: move f2fs_balance_fs to punch_hole
f2fs: add f2fs_balance_fs in several interfaces
f2fs: revisit the f2fs_gc flow
f2fs: check return value during recovery
f2fs: avoid null dereference in f2fs_acl_from_disk
f2fs: initialize newly allocated dnode structure
f2fs: update f2fs partition info about SIT/NAT layout
f2fs: update f2fs document to reflect SIT/NAT layout correctly
f2fs: remove unneeded INIT_LIST_HEAD at few places
...
Merge tag 'f2fs-for-3.9' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs
Pull f2fs update from Jaegeuk Kim:
"[Major bug fixes]
o Store device file information correctly
o Fix -EIO handling with respect to power-off-recovery
o Allocate blocks with global locks
o Fix wrong calculation of the SSR cost
[Cleanups]
o Get rid of fake on-stack dentries
[Enhancement]
o Support (un)freeze_fs
o Enhance the f2fs_gc flow
o Support 32-bit binary execution on 64-bit kernel"
* tag 'f2fs-for-3.9' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs: (29 commits)
f2fs: avoid build warning
f2fs: add compat_ioctl to provide backward compatability
f2fs: fix calculation of max. gc cost in the SSR case
f2fs: clarify and enhance the f2fs_gc flow
f2fs: optimize the return condition for has_not_enough_free_secs
f2fs: make an accessor to get sections for particular block type
f2fs: mark gc_thread as NULL when thread creation is failed
f2fs: name gc task as per the block device
f2fs: remove unnecessary gc option check and balance_fs
f2fs: remove repeated F2FS_SET_SB_DIRT call
f2fs: when check superblock failed, try to check another superblock
f2fs: use F2FS_BLKSIZE to judge bloksize and page_cache_size
f2fs: add device name in debugfs
f2fs: stop repeated checking if cp is needed
f2fs: avoid balanc_fs during evict_inode
f2fs: remove the use of page_cache_release
f2fs: fix typo mistake for data_version description
f2fs: reorganize code for ra_node_page
f2fs: avoid redundant call to has_not_enough_free_secs in f2fs_gc
f2fs: add un/freeze_fs into super_operations
...
Merge tag 'f2fs-for-v3.10' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs
Pull f2fs updates from Jaegeuk Kim:
"This patch-set includes the following major enhancement patches.
- introduce a new gloabl lock scheme
- add tracepoints on several major functions
- fix the overall cleaning process focused on victim selection
- apply the block plugging to merge IOs as much as possible
- enhance management of free nids and its list
- enhance the readahead mode for node pages
- address several cretical deadlock conditions
- reduce lock_page calls
The other minor bug fixes and enhancements are as follows.
- calculation mistakes: overflow
- bio types: READ, READA, and READ_SYNC
- fix the recovery flow, data races, and null pointer errors"
* tag 'f2fs-for-v3.10' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs: (68 commits)
f2fs: cover free_nid management with spin_lock
f2fs: optimize scan_nat_page()
f2fs: code cleanup for scan_nat_page() and build_free_nids()
f2fs: bugfix for alloc_nid_failed()
f2fs: recover when journal contains deleted files
f2fs: continue to mount after failing recovery
f2fs: avoid deadlock during evict after f2fs_gc
f2fs: modify the number of issued pages to merge IOs
f2fs: remove useless #include <linux/proc_fs.h> as we're now using sysfs as debug entry.
f2fs: fix inconsistent using of NM_WOUT_THRESHOLD
f2fs: check truncation of mapping after lock_page
f2fs: enhance alloc_nid and build_free_nids flows
f2fs: add a tracepoint on f2fs_new_inode
f2fs: check nid == 0 in add_free_nid
f2fs: add REQ_META about metadata requests for submit
f2fs: give a chance to merge IOs by IO scheduler
f2fs: avoid frequent background GC
f2fs: add tracepoints to debug checkpoint request
f2fs: add tracepoints for write page operations
f2fs: add tracepoints to debug the block allocation
...
Merge tag 'for-f2fs-3.11' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs
Pull f2fs updates from Jaegeuk Kim:
"This patch-set includes the following major enhancement patches:
- remount_fs callback function
- restore parent inode number to enhance the fsync performance
- xattr security labels
- reduce the number of redundant lock/unlock data pages
- avoid frequent write_inode calls
The other minor bug fixes are as follows.
- endian conversion bugs
- various bugs in the roll-forward recovery routine"
* tag 'for-f2fs-3.11' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs: (56 commits)
f2fs: fix to recover i_size from roll-forward
f2fs: remove the unused argument "sbi" of func destroy_fsync_dnodes()
f2fs: remove reusing any prefree segments
f2fs: code cleanup and simplify in func {find/add}_gc_inode
f2fs: optimize the init_dirty_segmap function
f2fs: fix an endian conversion bug detected by sparse
f2fs: fix crc endian conversion
f2fs: add remount_fs callback support
f2fs: recover wrong pino after checkpoint during fsync
f2fs: optimize do_write_data_page()
f2fs: make locate_dirty_segment() as static
f2fs: remove unnecessary parameter "offset" from __add_sum_entry()
f2fs: avoid freqeunt write_inode calls
f2fs: optimise the truncate_data_blocks_range() range
f2fs: use the F2FS specific flags in f2fs_ioctl()
f2fs: sync dir->i_size with its block allocation
f2fs: fix i_blocks translation on various types of files
f2fs: set sb->s_fs_info before calling parse_options()
f2fs: support xattr security labels
f2fs: fix iget/iput of dir during recovery
...
Merge tag 'for-f2fs-3.12' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs
Pull f2fs updates from Jaegeuk Kim:
"This patch-set includes the following major enhancement patches:
- support inline xattrs
- add sysfs support to control GCs explicitly
- add proc entry to show the current segment usage information
- improve the GC/SSR performance
The other bug fixes are as follows:
- avoid the overflow on status calculation
- fix some error handling routines
- fix inconsistent xattr states after power-off-recovery
- fix incorrect xattr node offset definition
- fix deadlock condition in fsync
- fix the fdatasync routine for power-off-recovery"
* tag 'for-f2fs-3.12' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs: (40 commits)
f2fs: optimize gc for better performance
f2fs: merge more bios of node block writes
f2fs: avoid an overflow during utilization calculation
f2fs: trigger GC when there are prefree segments
f2fs: use strncasecmp() simplify the string comparison
f2fs: fix omitting to update inode page
f2fs: support the inline xattrs
f2fs: add the truncate_xattr_node function
f2fs: introduce __find_xattr for readability
f2fs: reserve the xattr space dynamically
f2fs: add flags for inline xattrs
f2fs: fix error return code in init_f2fs_fs()
f2fs: fix wrong BUG_ON condition
f2fs: fix memory leak when init f2fs filesystem fail
f2fs: fix a compound statement label error
f2fs: avoid writing inode redundantly when creating a file
f2fs: alloc_page() doesn't return an ERR_PTR
f2fs: should cover i_xattr_nid with its xattr node page lock
f2fs: check the free space first in new_node_page
f2fs: clean up the needless end 'return' of void function
...
Merge tag 'for-f2fs-3.13' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs
Pull f2fs updates from Jaegeuk Kim:
"This patch-set includes the following major enhancement patches.
- add a sysfs to control reclaiming free segments
- enhance the f2fs global lock procedures
- enhance the victim selection flow
- wait for selected node blocks during fsync
- add some tracepoints
- add a config to remove abundant BUG_ONs
The other bug fixes are as follows.
- fix deadlock on acl operations
- fix some bugs with respect to orphan inodes
And, there are a bunch of cleanups"
* tag 'for-f2fs-3.13' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs: (42 commits)
f2fs: issue more large discard command
f2fs: fix memory leak after kobject init failed in fill_super
f2fs: cleanup waiting routine for writeback pages in cp
f2fs: avoid to use a NULL point in destroy_segment_manager
f2fs: remove unnecessary TestClearPageError when wait pages writeback
f2fs: update f2fs document
f2fs: avoid to wait all the node blocks during fsync
f2fs: check all ones or zeros bitmap with bitops for better mount performance
f2fs: change the method of calculating the number summary blocks
f2fs: fix calculating incorrect free size when update xattr in __f2fs_setxattr
f2fs: add an option to avoid unnecessary BUG_ONs
f2fs: introduce CONFIG_F2FS_CHECK_FS for BUG_ON control
f2fs: fix a deadlock during init_acl procedure
f2fs: clean up acl flow for better readability
f2fs: remove unnecessary segment bitmap updates
f2fs: add tracepoint for vm_page_mkwrite
f2fs: add tracepoint for set_page_dirty
f2fs: remove redundant set_page_dirty from write_compacted_summaries
f2fs: add reclaiming control by sysfs
f2fs: introduce f2fs_balance_fs_bg for some background jobs
...
Change-Id: Ied5488471d49d64ce6abb4be19237c4e90829ff6
diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h
new file mode 100644
index 0000000..bb942f6
--- /dev/null
+++ b/include/linux/f2fs_fs.h
@@ -0,0 +1,424 @@
+/**
+ * include/linux/f2fs_fs.h
+ *
+ * Copyright (c) 2012 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef _LINUX_F2FS_FS_H
+#define _LINUX_F2FS_FS_H
+
+#include <linux/pagemap.h>
+#include <linux/types.h>
+
+#define F2FS_SUPER_OFFSET 1024 /* byte-size offset */
+#define F2FS_LOG_SECTOR_SIZE 9 /* 9 bits for 512 byte */
+#define F2FS_LOG_SECTORS_PER_BLOCK 3 /* 4KB: F2FS_BLKSIZE */
+#define F2FS_BLKSIZE 4096 /* support only 4KB block */
+#define F2FS_MAX_EXTENSION 64 /* # of extension entries */
+
+#define NULL_ADDR ((block_t)0) /* used as block_t addresses */
+#define NEW_ADDR ((block_t)-1) /* used as block_t addresses */
+
+#define F2FS_ROOT_INO(sbi) (sbi->root_ino_num)
+#define F2FS_NODE_INO(sbi) (sbi->node_ino_num)
+#define F2FS_META_INO(sbi) (sbi->meta_ino_num)
+
+/* This flag is used by node and meta inodes, and by recovery */
+#define GFP_F2FS_ZERO (GFP_NOFS | __GFP_ZERO)
+
+/*
+ * For further optimization on multi-head logs, on-disk layout supports maximum
+ * 16 logs by default. The number, 16, is expected to cover all the cases
+ * enoughly. The implementaion currently uses no more than 6 logs.
+ * Half the logs are used for nodes, and the other half are used for data.
+ */
+#define MAX_ACTIVE_LOGS 16
+#define MAX_ACTIVE_NODE_LOGS 8
+#define MAX_ACTIVE_DATA_LOGS 8
+
+/*
+ * For superblock
+ */
+struct f2fs_super_block {
+ __le32 magic; /* Magic Number */
+ __le16 major_ver; /* Major Version */
+ __le16 minor_ver; /* Minor Version */
+ __le32 log_sectorsize; /* log2 sector size in bytes */
+ __le32 log_sectors_per_block; /* log2 # of sectors per block */
+ __le32 log_blocksize; /* log2 block size in bytes */
+ __le32 log_blocks_per_seg; /* log2 # of blocks per segment */
+ __le32 segs_per_sec; /* # of segments per section */
+ __le32 secs_per_zone; /* # of sections per zone */
+ __le32 checksum_offset; /* checksum offset inside super block */
+ __le64 block_count; /* total # of user blocks */
+ __le32 section_count; /* total # of sections */
+ __le32 segment_count; /* total # of segments */
+ __le32 segment_count_ckpt; /* # of segments for checkpoint */
+ __le32 segment_count_sit; /* # of segments for SIT */
+ __le32 segment_count_nat; /* # of segments for NAT */
+ __le32 segment_count_ssa; /* # of segments for SSA */
+ __le32 segment_count_main; /* # of segments for main area */
+ __le32 segment0_blkaddr; /* start block address of segment 0 */
+ __le32 cp_blkaddr; /* start block address of checkpoint */
+ __le32 sit_blkaddr; /* start block address of SIT */
+ __le32 nat_blkaddr; /* start block address of NAT */
+ __le32 ssa_blkaddr; /* start block address of SSA */
+ __le32 main_blkaddr; /* start block address of main area */
+ __le32 root_ino; /* root inode number */
+ __le32 node_ino; /* node inode number */
+ __le32 meta_ino; /* meta inode number */
+ __u8 uuid[16]; /* 128-bit uuid for volume */
+ __le16 volume_name[512]; /* volume name */
+ __le32 extension_count; /* # of extensions below */
+ __u8 extension_list[F2FS_MAX_EXTENSION][8]; /* extension array */
+} __packed;
+
+/*
+ * For checkpoint
+ */
+#define CP_ERROR_FLAG 0x00000008
+#define CP_COMPACT_SUM_FLAG 0x00000004
+#define CP_ORPHAN_PRESENT_FLAG 0x00000002
+#define CP_UMOUNT_FLAG 0x00000001
+
+struct f2fs_checkpoint {
+ __le64 checkpoint_ver; /* checkpoint block version number */
+ __le64 user_block_count; /* # of user blocks */
+ __le64 valid_block_count; /* # of valid blocks in main area */
+ __le32 rsvd_segment_count; /* # of reserved segments for gc */
+ __le32 overprov_segment_count; /* # of overprovision segments */
+ __le32 free_segment_count; /* # of free segments in main area */
+
+ /* information of current node segments */
+ __le32 cur_node_segno[MAX_ACTIVE_NODE_LOGS];
+ __le16 cur_node_blkoff[MAX_ACTIVE_NODE_LOGS];
+ /* information of current data segments */
+ __le32 cur_data_segno[MAX_ACTIVE_DATA_LOGS];
+ __le16 cur_data_blkoff[MAX_ACTIVE_DATA_LOGS];
+ __le32 ckpt_flags; /* Flags : umount and journal_present */
+ __le32 cp_pack_total_block_count; /* total # of one cp pack */
+ __le32 cp_pack_start_sum; /* start block number of data summary */
+ __le32 valid_node_count; /* Total number of valid nodes */
+ __le32 valid_inode_count; /* Total number of valid inodes */
+ __le32 next_free_nid; /* Next free node number */
+ __le32 sit_ver_bitmap_bytesize; /* Default value 64 */
+ __le32 nat_ver_bitmap_bytesize; /* Default value 256 */
+ __le32 checksum_offset; /* checksum offset inside cp block */
+ __le64 elapsed_time; /* mounted time */
+ /* allocation type of current segment */
+ unsigned char alloc_type[MAX_ACTIVE_LOGS];
+
+ /* SIT and NAT version bitmap */
+ unsigned char sit_nat_version_bitmap[1];
+} __packed;
+
+/*
+ * For orphan inode management
+ */
+#define F2FS_ORPHANS_PER_BLOCK 1020
+
+struct f2fs_orphan_block {
+ __le32 ino[F2FS_ORPHANS_PER_BLOCK]; /* inode numbers */
+ __le32 reserved; /* reserved */
+ __le16 blk_addr; /* block index in current CP */
+ __le16 blk_count; /* Number of orphan inode blocks in CP */
+ __le32 entry_count; /* Total number of orphan nodes in current CP */
+ __le32 check_sum; /* CRC32 for orphan inode block */
+} __packed;
+
+/*
+ * For NODE structure
+ */
+struct f2fs_extent {
+ __le32 fofs; /* start file offset of the extent */
+ __le32 blk_addr; /* start block address of the extent */
+ __le32 len; /* lengh of the extent */
+} __packed;
+
+#define F2FS_NAME_LEN 255
+#define F2FS_INLINE_XATTR_ADDRS 50 /* 200 bytes for inline xattrs */
+#define DEF_ADDRS_PER_INODE 923 /* Address Pointers in an Inode */
+#define ADDRS_PER_INODE(fi) addrs_per_inode(fi)
+#define ADDRS_PER_BLOCK 1018 /* Address Pointers in a Direct Block */
+#define NIDS_PER_BLOCK 1018 /* Node IDs in an Indirect Block */
+
+#define NODE_DIR1_BLOCK (DEF_ADDRS_PER_INODE + 1)
+#define NODE_DIR2_BLOCK (DEF_ADDRS_PER_INODE + 2)
+#define NODE_IND1_BLOCK (DEF_ADDRS_PER_INODE + 3)
+#define NODE_IND2_BLOCK (DEF_ADDRS_PER_INODE + 4)
+#define NODE_DIND_BLOCK (DEF_ADDRS_PER_INODE + 5)
+
+#define F2FS_INLINE_XATTR 0x01 /* file inline xattr flag */
+
+struct f2fs_inode {
+ __le16 i_mode; /* file mode */
+ __u8 i_advise; /* file hints */
+ __u8 i_inline; /* file inline flags */
+ __le32 i_uid; /* user ID */
+ __le32 i_gid; /* group ID */
+ __le32 i_links; /* links count */
+ __le64 i_size; /* file size in bytes */
+ __le64 i_blocks; /* file size in blocks */
+ __le64 i_atime; /* access time */
+ __le64 i_ctime; /* change time */
+ __le64 i_mtime; /* modification time */
+ __le32 i_atime_nsec; /* access time in nano scale */
+ __le32 i_ctime_nsec; /* change time in nano scale */
+ __le32 i_mtime_nsec; /* modification time in nano scale */
+ __le32 i_generation; /* file version (for NFS) */
+ __le32 i_current_depth; /* only for directory depth */
+ __le32 i_xattr_nid; /* nid to save xattr */
+ __le32 i_flags; /* file attributes */
+ __le32 i_pino; /* parent inode number */
+ __le32 i_namelen; /* file name length */
+ __u8 i_name[F2FS_NAME_LEN]; /* file name for SPOR */
+ __u8 i_reserved2; /* for backward compatibility */
+
+ struct f2fs_extent i_ext; /* caching a largest extent */
+
+ __le32 i_addr[DEF_ADDRS_PER_INODE]; /* Pointers to data blocks */
+
+ __le32 i_nid[5]; /* direct(2), indirect(2),
+ double_indirect(1) node id */
+} __packed;
+
+struct direct_node {
+ __le32 addr[ADDRS_PER_BLOCK]; /* array of data block address */
+} __packed;
+
+struct indirect_node {
+ __le32 nid[NIDS_PER_BLOCK]; /* array of data block address */
+} __packed;
+
+enum {
+ COLD_BIT_SHIFT = 0,
+ FSYNC_BIT_SHIFT,
+ DENT_BIT_SHIFT,
+ OFFSET_BIT_SHIFT
+};
+
+struct node_footer {
+ __le32 nid; /* node id */
+ __le32 ino; /* inode nunmber */
+ __le32 flag; /* include cold/fsync/dentry marks and offset */
+ __le64 cp_ver; /* checkpoint version */
+ __le32 next_blkaddr; /* next node page block address */
+} __packed;
+
+struct f2fs_node {
+ /* can be one of three types: inode, direct, and indirect types */
+ union {
+ struct f2fs_inode i;
+ struct direct_node dn;
+ struct indirect_node in;
+ };
+ struct node_footer footer;
+} __packed;
+
+/*
+ * For NAT entries
+ */
+#define NAT_ENTRY_PER_BLOCK (PAGE_CACHE_SIZE / sizeof(struct f2fs_nat_entry))
+
+struct f2fs_nat_entry {
+ __u8 version; /* latest version of cached nat entry */
+ __le32 ino; /* inode number */
+ __le32 block_addr; /* block address */
+} __packed;
+
+struct f2fs_nat_block {
+ struct f2fs_nat_entry entries[NAT_ENTRY_PER_BLOCK];
+} __packed;
+
+/*
+ * For SIT entries
+ *
+ * Each segment is 2MB in size by default so that a bitmap for validity of
+ * there-in blocks should occupy 64 bytes, 512 bits.
+ * Not allow to change this.
+ */
+#define SIT_VBLOCK_MAP_SIZE 64
+#define SIT_ENTRY_PER_BLOCK (PAGE_CACHE_SIZE / sizeof(struct f2fs_sit_entry))
+
+/*
+ * Note that f2fs_sit_entry->vblocks has the following bit-field information.
+ * [15:10] : allocation type such as CURSEG_XXXX_TYPE
+ * [9:0] : valid block count
+ */
+#define SIT_VBLOCKS_SHIFT 10
+#define SIT_VBLOCKS_MASK ((1 << SIT_VBLOCKS_SHIFT) - 1)
+#define GET_SIT_VBLOCKS(raw_sit) \
+ (le16_to_cpu((raw_sit)->vblocks) & SIT_VBLOCKS_MASK)
+#define GET_SIT_TYPE(raw_sit) \
+ ((le16_to_cpu((raw_sit)->vblocks) & ~SIT_VBLOCKS_MASK) \
+ >> SIT_VBLOCKS_SHIFT)
+
+struct f2fs_sit_entry {
+ __le16 vblocks; /* reference above */
+ __u8 valid_map[SIT_VBLOCK_MAP_SIZE]; /* bitmap for valid blocks */
+ __le64 mtime; /* segment age for cleaning */
+} __packed;
+
+struct f2fs_sit_block {
+ struct f2fs_sit_entry entries[SIT_ENTRY_PER_BLOCK];
+} __packed;
+
+/*
+ * For segment summary
+ *
+ * One summary block contains exactly 512 summary entries, which represents
+ * exactly 2MB segment by default. Not allow to change the basic units.
+ *
+ * NOTE: For initializing fields, you must use set_summary
+ *
+ * - If data page, nid represents dnode's nid
+ * - If node page, nid represents the node page's nid.
+ *
+ * The ofs_in_node is used by only data page. It represents offset
+ * from node's page's beginning to get a data block address.
+ * ex) data_blkaddr = (block_t)(nodepage_start_address + ofs_in_node)
+ */
+#define ENTRIES_IN_SUM 512
+#define SUMMARY_SIZE (7) /* sizeof(struct summary) */
+#define SUM_FOOTER_SIZE (5) /* sizeof(struct summary_footer) */
+#define SUM_ENTRY_SIZE (SUMMARY_SIZE * ENTRIES_IN_SUM)
+
+/* a summary entry for a 4KB-sized block in a segment */
+struct f2fs_summary {
+ __le32 nid; /* parent node id */
+ union {
+ __u8 reserved[3];
+ struct {
+ __u8 version; /* node version number */
+ __le16 ofs_in_node; /* block index in parent node */
+ } __packed;
+ };
+} __packed;
+
+/* summary block type, node or data, is stored to the summary_footer */
+#define SUM_TYPE_NODE (1)
+#define SUM_TYPE_DATA (0)
+
+struct summary_footer {
+ unsigned char entry_type; /* SUM_TYPE_XXX */
+ __u32 check_sum; /* summary checksum */
+} __packed;
+
+#define SUM_JOURNAL_SIZE (F2FS_BLKSIZE - SUM_FOOTER_SIZE -\
+ SUM_ENTRY_SIZE)
+#define NAT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\
+ sizeof(struct nat_journal_entry))
+#define NAT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\
+ sizeof(struct nat_journal_entry))
+#define SIT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\
+ sizeof(struct sit_journal_entry))
+#define SIT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\
+ sizeof(struct sit_journal_entry))
+/*
+ * frequently updated NAT/SIT entries can be stored in the spare area in
+ * summary blocks
+ */
+enum {
+ NAT_JOURNAL = 0,
+ SIT_JOURNAL
+};
+
+struct nat_journal_entry {
+ __le32 nid;
+ struct f2fs_nat_entry ne;
+} __packed;
+
+struct nat_journal {
+ struct nat_journal_entry entries[NAT_JOURNAL_ENTRIES];
+ __u8 reserved[NAT_JOURNAL_RESERVED];
+} __packed;
+
+struct sit_journal_entry {
+ __le32 segno;
+ struct f2fs_sit_entry se;
+} __packed;
+
+struct sit_journal {
+ struct sit_journal_entry entries[SIT_JOURNAL_ENTRIES];
+ __u8 reserved[SIT_JOURNAL_RESERVED];
+} __packed;
+
+/* 4KB-sized summary block structure */
+struct f2fs_summary_block {
+ struct f2fs_summary entries[ENTRIES_IN_SUM];
+ union {
+ __le16 n_nats;
+ __le16 n_sits;
+ };
+ /* spare area is used by NAT or SIT journals */
+ union {
+ struct nat_journal nat_j;
+ struct sit_journal sit_j;
+ };
+ struct summary_footer footer;
+} __packed;
+
+/*
+ * For directory operations
+ */
+#define F2FS_DOT_HASH 0
+#define F2FS_DDOT_HASH F2FS_DOT_HASH
+#define F2FS_MAX_HASH (~((0x3ULL) << 62))
+#define F2FS_HASH_COL_BIT ((0x1ULL) << 63)
+
+typedef __le32 f2fs_hash_t;
+
+/* One directory entry slot covers 8bytes-long file name */
+#define F2FS_SLOT_LEN 8
+#define F2FS_SLOT_LEN_BITS 3
+
+#define GET_DENTRY_SLOTS(x) ((x + F2FS_SLOT_LEN - 1) >> F2FS_SLOT_LEN_BITS)
+
+/* the number of dentry in a block */
+#define NR_DENTRY_IN_BLOCK 214
+
+/* MAX level for dir lookup */
+#define MAX_DIR_HASH_DEPTH 63
+
+#define SIZE_OF_DIR_ENTRY 11 /* by byte */
+#define SIZE_OF_DENTRY_BITMAP ((NR_DENTRY_IN_BLOCK + BITS_PER_BYTE - 1) / \
+ BITS_PER_BYTE)
+#define SIZE_OF_RESERVED (PAGE_SIZE - ((SIZE_OF_DIR_ENTRY + \
+ F2FS_SLOT_LEN) * \
+ NR_DENTRY_IN_BLOCK + SIZE_OF_DENTRY_BITMAP))
+
+/* One directory entry slot representing F2FS_SLOT_LEN-sized file name */
+struct f2fs_dir_entry {
+ __le32 hash_code; /* hash code of file name */
+ __le32 ino; /* inode number */
+ __le16 name_len; /* lengh of file name */
+ __u8 file_type; /* file type */
+} __packed;
+
+/* 4KB-sized directory entry block */
+struct f2fs_dentry_block {
+ /* validity bitmap for directory entries in each block */
+ __u8 dentry_bitmap[SIZE_OF_DENTRY_BITMAP];
+ __u8 reserved[SIZE_OF_RESERVED];
+ struct f2fs_dir_entry dentry[NR_DENTRY_IN_BLOCK];
+ __u8 filename[NR_DENTRY_IN_BLOCK][F2FS_SLOT_LEN];
+} __packed;
+
+/* file types used in inode_info->flags */
+enum {
+ F2FS_FT_UNKNOWN,
+ F2FS_FT_REG_FILE,
+ F2FS_FT_DIR,
+ F2FS_FT_CHRDEV,
+ F2FS_FT_BLKDEV,
+ F2FS_FT_FIFO,
+ F2FS_FT_SOCK,
+ F2FS_FT_SYMLINK,
+ F2FS_FT_MAX
+};
+
+#endif /* _LINUX_F2FS_FS_H */