diff options
Diffstat (limited to 'include/linux/ext4_fs_extents.h')
| -rw-r--r-- | include/linux/ext4_fs_extents.h | 54 |
1 files changed, 27 insertions, 27 deletions
diff --git a/include/linux/ext4_fs_extents.h b/include/linux/ext4_fs_extents.h index 0eba0acf6ba6..a41cc24568ca 100644 --- a/include/linux/ext4_fs_extents.h +++ b/include/linux/ext4_fs_extents.h @@ -22,29 +22,29 @@ #include <linux/ext4_fs.h> /* - * with AGRESSIVE_TEST defined capacity of index/leaf blocks - * become very little, so index split, in-depth growing and - * other hard changes happens much more often - * this is for debug purposes only + * With AGRESSIVE_TEST defined, the capacity of index/leaf blocks + * becomes very small, so index split, in-depth growing and + * other hard changes happen much more often. + * This is for debug purposes only. */ #define AGRESSIVE_TEST_ /* - * with EXTENTS_STATS defined number of blocks and extents - * are collected in truncate path. they'll be showed at - * umount time + * With EXTENTS_STATS defined, the number of blocks and extents + * are collected in the truncate path. They'll be shown at + * umount time. */ #define EXTENTS_STATS__ /* - * if CHECK_BINSEARCH defined, then results of binary search - * will be checked by linear search + * If CHECK_BINSEARCH is defined, then the results of the binary search + * will also be checked by linear search. */ #define CHECK_BINSEARCH__ /* - * if EXT_DEBUG is defined you can use 'extdebug' mount option - * to get lots of info what's going on + * If EXT_DEBUG is defined you can use the 'extdebug' mount option + * to get lots of info about what's going on. */ #define EXT_DEBUG__ #ifdef EXT_DEBUG @@ -54,58 +54,58 @@ #endif /* - * if EXT_STATS is defined then stats numbers are collected - * these number will be displayed at umount time + * If EXT_STATS is defined then stats numbers are collected. + * These number will be displayed at umount time. */ #define EXT_STATS_ /* - * ext4_inode has i_block array (60 bytes total) - * first 12 bytes store ext4_extent_header - * the remain stores array of ext4_extent + * ext4_inode has i_block array (60 bytes total). + * The first 12 bytes store ext4_extent_header; + * the remainder stores an array of ext4_extent. */ /* - * this is extent on-disk structure - * it's used at the bottom of the tree + * This is the extent on-disk structure. + * It's used at the bottom of the tree. */ struct ext4_extent { __le32 ee_block; /* first logical block extent covers */ __le16 ee_len; /* number of blocks covered by extent */ __le16 ee_start_hi; /* high 16 bits of physical block */ - __le32 ee_start; /* low 32 bigs of physical block */ + __le32 ee_start; /* low 32 bits of physical block */ }; /* - * this is index on-disk structure - * it's used at all the levels, but the bottom + * This is index on-disk structure. + * It's used at all the levels except the bottom. */ struct ext4_extent_idx { __le32 ei_block; /* index covers logical blocks from 'block' */ __le32 ei_leaf; /* pointer to the physical block of the next * - * level. leaf or next index could bet here */ + * level. leaf or next index could be there */ __le16 ei_leaf_hi; /* high 16 bits of physical block */ __u16 ei_unused; }; /* - * each block (leaves and indexes), even inode-stored has header + * Each block (leaves and indexes), even inode-stored has header. */ struct ext4_extent_header { __le16 eh_magic; /* probably will support different formats */ __le16 eh_entries; /* number of valid entries */ __le16 eh_max; /* capacity of store in entries */ - __le16 eh_depth; /* has tree real underlaying blocks? */ + __le16 eh_depth; /* has tree real underlying blocks? */ __le32 eh_generation; /* generation of the tree */ }; #define EXT4_EXT_MAGIC cpu_to_le16(0xf30a) /* - * array of ext4_ext_path contains path to some extent - * creation/lookup routines use it for traversal/splitting/etc - * truncate uses it to simulate recursive walking + * Array of ext4_ext_path contains path to some extent. + * Creation/lookup routines use it for traversal/splitting/etc. + * Truncate uses it to simulate recursive walking. */ struct ext4_ext_path { ext4_fsblk_t p_block; |