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| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2008-01-28 23:58:26 -0500 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2008-01-28 23:58:26 -0500 |
| commit | 0fc1b451471dfc3cabd6e99ef441df9804616e63 (patch) | |
| tree | b018b6ddc5bb5f02b985b06c11f0c01adb38167a /include/linux/ext4_fs.h | |
| parent | a48380f769dfed6163fb82a68b13bd562ea1e027 (diff) | |
| download | lwn-0fc1b451471dfc3cabd6e99ef441df9804616e63.tar.gz lwn-0fc1b451471dfc3cabd6e99ef441df9804616e63.zip | |
ext4: Add support for 48 bit inode i_blocks.
Use the __le16 l_i_reserved1 field of the linux2 struct of ext4_inode
to represet the higher 16 bits for i_blocks. With this change max_file
size becomes (2**48 -1 )* 512 bytes.
We add a RO_COMPAT feature to the super block to indicate that inode
have i_blocks represented as a split 48 bits. Super block with this
feature set cannot be mounted read write on a kernel with CONFIG_LSF
disabled.
Super block flag EXT4_FEATURE_RO_COMPAT_HUGE_FILE
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Diffstat (limited to 'include/linux/ext4_fs.h')
| -rw-r--r-- | include/linux/ext4_fs.h | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/include/linux/ext4_fs.h b/include/linux/ext4_fs.h index a8f3faea8eff..be25eca9c040 100644 --- a/include/linux/ext4_fs.h +++ b/include/linux/ext4_fs.h @@ -282,7 +282,7 @@ struct ext4_inode { __le32 i_dtime; /* Deletion Time */ __le16 i_gid; /* Low 16 bits of Group Id */ __le16 i_links_count; /* Links count */ - __le32 i_blocks; /* Blocks count */ + __le32 i_blocks_lo; /* Blocks count */ __le32 i_flags; /* File flags */ union { struct { @@ -302,7 +302,7 @@ struct ext4_inode { __le32 i_obso_faddr; /* Obsoleted fragment address */ union { struct { - __le16 l_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ + __le16 l_i_blocks_high; /* were l_i_reserved1 */ __le16 l_i_file_acl_high; __le16 l_i_uid_high; /* these 2 fields */ __le16 l_i_gid_high; /* were reserved2[0] */ @@ -404,6 +404,7 @@ do { \ #if defined(__KERNEL__) || defined(__linux__) #define i_reserved1 osd1.linux1.l_i_reserved1 #define i_file_acl_high osd2.linux2.l_i_file_acl_high +#define i_blocks_high osd2.linux2.l_i_blocks_high #define i_uid_low i_uid #define i_gid_low i_gid #define i_uid_high osd2.linux2.l_i_uid_high @@ -670,6 +671,7 @@ static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 +#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 @@ -681,6 +683,7 @@ static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 +#define EXT4_FEATURE_INCOMPAT_MMP 0x0100 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR @@ -695,7 +698,8 @@ static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ - EXT4_FEATURE_RO_COMPAT_BTREE_DIR) + EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ + EXT4_FEATURE_RO_COMPAT_HUGE_FILE) /* * Default values for user and/or group using reserved blocks |