diff options
| author | Zach Brown <zach.brown@oracle.com> | 2006-10-11 01:21:08 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-10-11 11:14:16 -0700 |
| commit | b517bea1c74e4773482b3f41b3f493522a8c8e30 (patch) | |
| tree | 1e98110151f1a35cde84ce1a2cb6f0cb871e9551 /include/linux/jbd2.h | |
| parent | d0d856e8bd6e697cb44b2b4dd038f3bec576a70e (diff) | |
[PATCH] 64-bit jbd2 core
Here is the patch to JBD to handle 64 bit block numbers, originally from Zach
Brown. This patch is useful only after adding support for 64-bit block
numbers in the filesystem.
Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com>
Signed-off-by: Zach Brown <zach.brown@oracle.com>
Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/jbd2.h')
| -rw-r--r-- | include/linux/jbd2.h | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h index 3251f7abb57..5e5aa64f126 100644 --- a/include/linux/jbd2.h +++ b/include/linux/jbd2.h @@ -150,14 +150,21 @@ typedef struct journal_header_s /* - * The block tag: used to describe a single buffer in the journal + * The block tag: used to describe a single buffer in the journal. + * t_blocknr_high is only used if INCOMPAT_64BIT is set, so this + * raw struct shouldn't be used for pointer math or sizeof() - use + * journal_tag_bytes(journal) instead to compute this. */ typedef struct journal_block_tag_s { __be32 t_blocknr; /* The on-disk block number */ __be32 t_flags; /* See below */ + __be32 t_blocknr_high; /* most-significant high 32bits. */ } journal_block_tag_t; +#define JBD_TAG_SIZE32 (offsetof(journal_block_tag_t, t_blocknr_high)) +#define JBD_TAG_SIZE64 (sizeof(journal_block_tag_t)) + /* * The revoke descriptor: used on disk to describe a series of blocks to * be revoked from the log @@ -235,11 +242,13 @@ typedef struct journal_superblock_s ((j)->j_superblock->s_feature_incompat & cpu_to_be32((mask)))) #define JBD2_FEATURE_INCOMPAT_REVOKE 0x00000001 +#define JBD2_FEATURE_INCOMPAT_64BIT 0x00000002 /* Features known to this kernel version: */ #define JBD2_KNOWN_COMPAT_FEATURES 0 #define JBD2_KNOWN_ROCOMPAT_FEATURES 0 -#define JBD2_KNOWN_INCOMPAT_FEATURES JBD2_FEATURE_INCOMPAT_REVOKE +#define JBD2_KNOWN_INCOMPAT_FEATURES (JBD2_FEATURE_INCOMPAT_REVOKE | \ + JBD2_FEATURE_INCOMPAT_64BIT) #ifdef __KERNEL__ @@ -1052,6 +1061,7 @@ static inline int tid_geq(tid_t x, tid_t y) } extern int jbd2_journal_blocks_per_page(struct inode *inode); +extern size_t journal_tag_bytes(journal_t *journal); /* * Return the minimum number of blocks which must be free in the journal |