1 files changed, 59 insertions, 20 deletions

diff --git a/include/linux/nilfs2_fs.h b/include/linux/nilfs2_fs.h
index 3fe02cf8b65a..f5487b6f91ed 100644
--- a/include/linux/nilfs2_fs.h
+++ b/include/linux/nilfs2_fs.h
@@ -153,13 +153,14 @@ struct nilfs_super_root {
                                                    semantics also for data */
 #define NILFS_MOUNT_NORECOVERY          0x4000  /* Disable write access during
                                                    mount-time recovery */
+#define NILFS_MOUNT_DISCARD             0x8000  /* Issue DISCARD requests */
 
 
 /**
  * struct nilfs_super_block - structure of super block on disk
  */
 struct nilfs_super_block {
-        __le32  s_rev_level;            /* Revision level */
+/*00*/  __le32  s_rev_level;            /* Revision level */
         __le16  s_minor_rev_level;      /* minor revision level */
         __le16  s_magic;                /* Magic signature */
 
@@ -168,51 +169,53 @@ struct nilfs_super_block {
                                            is excluded. */
         __le16  s_flags;                /* flags */
         __le32  s_crc_seed;             /* Seed value of CRC calculation */
-        __le32  s_sum;                  /* Check sum of super block */
+/*10*/  __le32  s_sum;                  /* Check sum of super block */
 
         __le32  s_log_block_size;       /* Block size represented as follows
                                            blocksize =
                                                1 << (s_log_block_size + 10) */
         __le64  s_nsegments;            /* Number of segments in filesystem */
-        __le64  s_dev_size;             /* block device size in bytes */
+/*20*/  __le64  s_dev_size;             /* block device size in bytes */
         __le64  s_first_data_block;     /* 1st seg disk block number */
-        __le32  s_blocks_per_segment;   /* number of blocks per full segment */
+/*30*/  __le32  s_blocks_per_segment;   /* number of blocks per full segment */
         __le32  s_r_segments_percentage; /* Reserved segments percentage */
 
         __le64  s_last_cno;             /* Last checkpoint number */
-        __le64  s_last_pseg;            /* disk block addr pseg written last */
+/*40*/  __le64  s_last_pseg;            /* disk block addr pseg written last */
         __le64  s_last_seq;             /* seq. number of seg written last */
-        __le64  s_free_blocks_count;    /* Free blocks count */
+/*50*/  __le64  s_free_blocks_count;    /* Free blocks count */
 
         __le64  s_ctime;                /* Creation time (execution time of
                                            newfs) */
-        __le64  s_mtime;                /* Mount time */
+/*60*/  __le64  s_mtime;                /* Mount time */
         __le64  s_wtime;                /* Write time */
-        __le16  s_mnt_count;            /* Mount count */
+/*70*/  __le16  s_mnt_count;            /* Mount count */
         __le16  s_max_mnt_count;        /* Maximal mount count */
         __le16  s_state;                /* File system state */
         __le16  s_errors;               /* Behaviour when detecting errors */
         __le64  s_lastcheck;            /* time of last check */
 
-        __le32  s_checkinterval;        /* max. time between checks */
+/*80*/  __le32  s_checkinterval;        /* max. time between checks */
         __le32  s_creator_os;           /* OS */
         __le16  s_def_resuid;           /* Default uid for reserved blocks */
         __le16  s_def_resgid;           /* Default gid for reserved blocks */
-        __le32  s_first_ino;            /* First non-reserved inode */
+        __le32  s_first_ino;            /* First non-reserved inode */
 
-        __le16  s_inode_size;           /* Size of an inode */
+/*90*/  __le16  s_inode_size;           /* Size of an inode */
         __le16  s_dat_entry_size;       /* Size of a dat entry */
         __le16  s_checkpoint_size;      /* Size of a checkpoint */
         __le16  s_segment_usage_size;   /* Size of a segment usage */
 
-        __u8    s_uuid[16];             /* 128-bit uuid for volume */
-        char    s_volume_name[16];      /* volume name */
-        char    s_last_mounted[64];     /* directory where last mounted */
+/*98*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
+/*A8*/  char    s_volume_name[80];      /* volume name */
 
-        __le32  s_c_interval;           /* Commit interval of segment */
+/*F8*/  __le32  s_c_interval;           /* Commit interval of segment */
         __le32  s_c_block_max;          /* Threshold of data amount for
                                            the segment construction */
-        __u32   s_reserved[192];        /* padding to the end of the block */
+/*100*/ __le64  s_feature_compat;       /* Compatible feature set */
+        __le64  s_feature_compat_ro;    /* Read-only compatible feature set */
+        __le64  s_feature_incompat;     /* Incompatible feature set */
+        __u32   s_reserved[186];        /* padding to the end of the block */
 };
 
 /*
@@ -228,6 +231,16 @@ struct nilfs_super_block {
 #define NILFS_MINOR_REV         0       /* minor revision */
 
 /*
+ * Feature set definitions
+ *
+ * If there is a bit set in the incompatible feature set that the kernel
+ * doesn't know about, it should refuse to mount the filesystem.
+ */
+#define NILFS_FEATURE_COMPAT_SUPP       0ULL
+#define NILFS_FEATURE_COMPAT_RO_SUPP    0ULL
+#define NILFS_FEATURE_INCOMPAT_SUPP     0ULL
+
+/*
  * Bytes count of super_block for CRC-calculation
  */
 #define NILFS_SB_BYTES  \
@@ -274,6 +287,12 @@ struct nilfs_super_block {
 #define NILFS_NAME_LEN 255
 
 /*
+ * Block size limitations
+ */
+#define NILFS_MIN_BLOCK_SIZE            1024
+#define NILFS_MAX_BLOCK_SIZE            65536
+
+/*
  * The new version of the directory entry.  Since V0 structures are
  * stored in intel byte order, and the name_len field could never be
  * bigger than 255 chars, it's safe to reclaim the extra byte for the
@@ -313,7 +332,25 @@ enum {
 #define NILFS_DIR_ROUND                 (NILFS_DIR_PAD - 1)
 #define NILFS_DIR_REC_LEN(name_len)     (((name_len) + 12 + NILFS_DIR_ROUND) & \
                                         ~NILFS_DIR_ROUND)
+#define NILFS_MAX_REC_LEN               ((1<<16)-1)
 
+static inline unsigned nilfs_rec_len_from_disk(__le16 dlen)
+{
+        unsigned len = le16_to_cpu(dlen);
+
+        if (len == NILFS_MAX_REC_LEN)
+                return 1 << 16;
+        return len;
+}
+
+static inline __le16 nilfs_rec_len_to_disk(unsigned len)
+{
+        if (len == (1 << 16))
+                return cpu_to_le16(NILFS_MAX_REC_LEN);
+        else if (len > (1 << 16))
+                BUG();
+        return cpu_to_le16(len);
+}
 
 /**
  * struct nilfs_finfo - file information
@@ -376,6 +413,7 @@ union nilfs_binfo {
  * @ss_nfinfo: number of finfo structures
  * @ss_sumbytes: total size of segment summary in bytes
  * @ss_pad: padding
+ * @ss_cno: checkpoint number
  */
 struct nilfs_segment_summary {
         __le32 ss_datasum;
@@ -390,6 +428,7 @@ struct nilfs_segment_summary {
         __le32 ss_nfinfo;
         __le32 ss_sumbytes;
         __le32 ss_pad;
+        __le64 ss_cno;
         /* array of finfo structures */
 };
 
@@ -436,10 +475,10 @@ struct nilfs_palloc_group_desc {
 
 /**
  * struct nilfs_dat_entry - disk address translation entry
- * @dt_blocknr: block number
- * @dt_start: start checkpoint number
- * @dt_end: end checkpoint number
- * @dt_rsv: reserved for future use
+ * @de_blocknr: block number
+ * @de_start: start checkpoint number
+ * @de_end: end checkpoint number
+ * @de_rsv: reserved for future use
  */
 struct nilfs_dat_entry {
         __le64 de_blocknr;