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Subject[RFC][Update][Patch 4/16]support 48 bit blk number in extents
From
Date
48bit physical block number support in extents.

Signed-Off-By: Alex Tomas <alex@clusterfs.com>


---
linux-2.6.17-ming/fs/ext3/extents.c | 138 +++++++++++++---------
linux-2.6.17-ming/include/linux/ext3_fs_extents.h | 2
linux-2.6.17-ming/include/linux/ext3_fs_i.h | 2
3 files changed, 87 insertions(+), 55 deletions(-)
diff -puN fs/ext3/extents.c~ext3-extents-48bit fs/ext3/extents.c
--- linux-2.6.17/fs/ext3/extents.c~ext3-extents-48bit 2006-06-28 16:46:39.848883567 -0700
+++ linux-2.6.17-ming/fs/ext3/extents.c 2006-06-28 16:46:39.863881846 -0700
@@ -44,6 +44,44 @@
#include <asm/uaccess.h>


+/* this macro combines low and hi parts of phys. blocknr into sector_t */
+static inline sector_t ext_pblock(struct ext3_extent *ex)
+{
+ sector_t block;
+
+ block = le32_to_cpu(ex->ee_start);
+ if (sizeof(sector_t) > 4)
+ block |= ((sector_t) le16_to_cpu(ex->ee_start_hi) << 31) << 1;
+ return block;
+}
+
+/* this macro combines low and hi parts of phys. blocknr into sector_t */
+static inline sector_t idx_pblock(struct ext3_extent_idx *ix)
+{
+ sector_t block;
+
+ block = le32_to_cpu(ix->ei_leaf);
+ if (sizeof(sector_t) > 4)
+ block |= ((sector_t) le16_to_cpu(ix->ei_leaf_hi) << 31) << 1;
+ return block;
+}
+
+/* the routine stores large phys. blocknr into extent breaking it into parts */
+static inline void ext3_ext_store_pblock(struct ext3_extent *ex, sector_t pb)
+{
+ ex->ee_start = cpu_to_le32((unsigned long) (pb & 0xffffffff));
+ if (sizeof(sector_t) > 4)
+ ex->ee_start_hi = cpu_to_le16((unsigned long) ((pb >> 31) >> 1) & 0xffff);
+}
+
+/* the routine stores large phys. blocknr into index breaking it into parts */
+static inline void ext3_idx_store_pblock(struct ext3_extent_idx *ix, sector_t pb)
+{
+ ix->ei_leaf = cpu_to_le32((unsigned long) (pb & 0xffffffff));
+ if (sizeof(sector_t) > 4)
+ ix->ei_leaf_hi = cpu_to_le16((unsigned long) ((pb >> 31) >> 1) & 0xffff);
+}
+
static int ext3_ext_check_header(const char *function, struct inode *inode,
struct ext3_extent_header *eh)
{
@@ -126,7 +164,7 @@ static int ext3_ext_dirty(handle_t *hand

static int ext3_ext_find_goal(struct inode *inode,
struct ext3_ext_path *path,
- unsigned long block)
+ sector_t block)
{
struct ext3_inode_info *ei = EXT3_I(inode);
unsigned long bg_start;
@@ -139,8 +177,7 @@ static int ext3_ext_find_goal(struct ino

/* try to predict block placement */
if ((ex = path[depth].p_ext))
- return le32_to_cpu(ex->ee_start)
- + (block - le32_to_cpu(ex->ee_block));
+ return ext_pblock(ex)+(block-le32_to_cpu(ex->ee_block));

/* it looks index is empty
* try to find starting from index itself */
@@ -230,13 +267,13 @@ static void ext3_ext_show_path(struct in
ext_debug("path:");
for (k = 0; k <= l; k++, path++) {
if (path->p_idx) {
- ext_debug(" %d->%d", le32_to_cpu(path->p_idx->ei_block),
- le32_to_cpu(path->p_idx->ei_leaf));
+ ext_debug(" %d->%llu", le32_to_cpu(path->p_idx->ei_block),
+ idx_pblock(path->p_idx));
} else if (path->p_ext) {
- ext_debug(" %d:%d:%d",
+ ext_debug(" %d:%d:%lld",
le32_to_cpu(path->p_ext->ee_block),
le16_to_cpu(path->p_ext->ee_len),
- le32_to_cpu(path->p_ext->ee_start));
+ ext_pblock(path->p_ext));
} else
ext_debug(" []");
}
@@ -257,9 +294,8 @@ static void ext3_ext_show_leaf(struct in
ex = EXT_FIRST_EXTENT(eh);

for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ex++) {
- ext_debug("%d:%d:%d ", le32_to_cpu(ex->ee_block),
- le16_to_cpu(ex->ee_len),
- le32_to_cpu(ex->ee_start));
+ ext_debug("%d:%d:%lld ", le32_to_cpu(ex->ee_block),
+ le16_to_cpu(ex->ee_len), ext_pblock(ex));
}
ext_debug("\n");
}
@@ -308,8 +344,8 @@ ext3_ext_binsearch_idx(struct inode *ino
}

path->p_idx = l - 1;
- ext_debug(" -> %d->%d ", le32_to_cpu(path->p_idx->ei_block),
- le32_to_cpu(path->p_idx->ei_leaf));
+ ext_debug(" -> %d->%lld ", le32_to_cpu(path->p_idx->ei_block),
+ idx_block(path->p_idx));

#ifdef CHECK_BINSEARCH
{
@@ -374,10 +410,10 @@ ext3_ext_binsearch(struct inode *inode,
}

path->p_ext = l - 1;
- ext_debug(" -> %d:%d:%d ",
+ ext_debug(" -> %d:%lld:%d ",
le32_to_cpu(path->p_ext->ee_block),
- le32_to_cpu(path->p_ext->ee_start),
- le16_to_cpu(path->p_ext->ee_len));
+ ext_pblock(path->p_ext),
+ le16_to_cpu(path->p_ext->ee_len));

#ifdef CHECK_BINSEARCH
{
@@ -442,7 +478,7 @@ ext3_ext_find_extent(struct inode *inode
ext_debug("depth %d: num %d, max %d\n",
ppos, le16_to_cpu(eh->eh_entries), le16_to_cpu(eh->eh_max));
ext3_ext_binsearch_idx(inode, path + ppos, block);
- path[ppos].p_block = le32_to_cpu(path[ppos].p_idx->ei_leaf);
+ path[ppos].p_block = idx_pblock(path[ppos].p_idx);
path[ppos].p_depth = i;
path[ppos].p_ext = NULL;

@@ -524,7 +560,7 @@ static int ext3_ext_insert_index(handle_
}

ix->ei_block = cpu_to_le32(logical);
- ix->ei_leaf = cpu_to_le32(ptr);
+ ext3_idx_store_pblock(ix, ptr);
curp->p_hdr->eh_entries = cpu_to_le16(le16_to_cpu(curp->p_hdr->eh_entries)+1);

BUG_ON(le16_to_cpu(curp->p_hdr->eh_entries)
@@ -633,9 +669,9 @@ static int ext3_ext_split(handle_t *hand
path[depth].p_ext++;
while (path[depth].p_ext <=
EXT_MAX_EXTENT(path[depth].p_hdr)) {
- ext_debug("move %d:%d:%d in new leaf %lu\n",
+ ext_debug("move %d:%lld:%d in new leaf %lu\n",
le32_to_cpu(path[depth].p_ext->ee_block),
- le32_to_cpu(path[depth].p_ext->ee_start),
+ ext_pblock(path[depth].p_ext),
le16_to_cpu(path[depth].p_ext->ee_len),
newblock);
/*memmove(ex++, path[depth].p_ext++,
@@ -696,7 +732,7 @@ static int ext3_ext_split(handle_t *hand
neh->eh_depth = cpu_to_le16(depth - i);
fidx = EXT_FIRST_INDEX(neh);
fidx->ei_block = border;
- fidx->ei_leaf = cpu_to_le32(oldblock);
+ ext3_idx_store_pblock(fidx, oldblock);

ext_debug("int.index at %d (block %lu): %lu -> %lu\n", i,
newblock, (unsigned long) le32_to_cpu(border),
@@ -710,9 +746,9 @@ static int ext3_ext_split(handle_t *hand
BUG_ON(EXT_MAX_INDEX(path[i].p_hdr) !=
EXT_LAST_INDEX(path[i].p_hdr));
while (path[i].p_idx <= EXT_MAX_INDEX(path[i].p_hdr)) {
- ext_debug("%d: move %d:%d in new index %lu\n", i,
+ ext_debug("%d: move %d:%d in new index %llu\n", i,
le32_to_cpu(path[i].p_idx->ei_block),
- le32_to_cpu(path[i].p_idx->ei_leaf),
+ idx_pblock(path[i].p_idx),
newblock);
/*memmove(++fidx, path[i].p_idx++,
sizeof(struct ext3_extent_idx));
@@ -839,13 +875,13 @@ static int ext3_ext_grow_indepth(handle_
curp->p_idx = EXT_FIRST_INDEX(curp->p_hdr);
/* FIXME: it works, but actually path[0] can be index */
curp->p_idx->ei_block = EXT_FIRST_EXTENT(path[0].p_hdr)->ee_block;
- curp->p_idx->ei_leaf = cpu_to_le32(newblock);
+ ext3_idx_store_pblock(curp->p_idx, newblock);

neh = ext_inode_hdr(inode);
fidx = EXT_FIRST_INDEX(neh);
- ext_debug("new root: num %d(%d), lblock %d, ptr %d\n",
+ ext_debug("new root: num %d(%d), lblock %d, ptr %llu\n",
le16_to_cpu(neh->eh_entries), le16_to_cpu(neh->eh_max),
- le32_to_cpu(fidx->ei_block), le32_to_cpu(fidx->ei_leaf));
+ le32_to_cpu(fidx->ei_block), idx_pblock(fidx));

neh->eh_depth = cpu_to_le16(path->p_depth + 1);
err = ext3_ext_dirty(handle, inode, curp);
@@ -1042,7 +1078,6 @@ static int inline
ext3_can_extents_be_merged(struct inode *inode, struct ext3_extent *ex1,
struct ext3_extent *ex2)
{
- /* FIXME: 48bit support */
if (le32_to_cpu(ex1->ee_block) + le16_to_cpu(ex1->ee_len)
!= le32_to_cpu(ex2->ee_block))
return 0;
@@ -1052,8 +1087,7 @@ ext3_can_extents_be_merged(struct inode
return 0;
#endif

- if (le32_to_cpu(ex1->ee_start) + le16_to_cpu(ex1->ee_len)
- == le32_to_cpu(ex2->ee_start))
+ if (ext_pblock(ex1) + le16_to_cpu(ex1->ee_len) == ext_pblock(ex2))
return 1;
return 0;
}
@@ -1080,11 +1114,10 @@ int ext3_ext_insert_extent(handle_t *han

/* try to insert block into found extent and return */
if (ex && ext3_can_extents_be_merged(inode, ex, newext)) {
- ext_debug("append %d block to %d:%d (from %d)\n",
+ ext_debug("append %d block to %d:%d (from %lld)\n",
le16_to_cpu(newext->ee_len),
le32_to_cpu(ex->ee_block),
- le16_to_cpu(ex->ee_len),
- le32_to_cpu(ex->ee_start));
+ le16_to_cpu(ex->ee_len), ext_pblock(ex));
if ((err = ext3_ext_get_access(handle, inode, path + depth)))
return err;
ex->ee_len = cpu_to_le16(le16_to_cpu(ex->ee_len)
@@ -1140,9 +1173,9 @@ has_space:

if (!nearex) {
/* there is no extent in this leaf, create first one */
- ext_debug("first extent in the leaf: %d:%d:%d\n",
+ ext_debug("first extent in the leaf: %d:%lld:%d\n",
le32_to_cpu(newext->ee_block),
- le32_to_cpu(newext->ee_start),
+ ext_pblock(newext),
le16_to_cpu(newext->ee_len));
path[depth].p_ext = EXT_FIRST_EXTENT(eh);
} else if (le32_to_cpu(newext->ee_block)
@@ -1152,10 +1185,10 @@ has_space:
len = EXT_MAX_EXTENT(eh) - nearex;
len = (len - 1) * sizeof(struct ext3_extent);
len = len < 0 ? 0 : len;
- ext_debug("insert %d:%d:%d after: nearest 0x%p, "
+ ext_debug("insert %d:%lld:%d after: nearest 0x%p, "
"move %d from 0x%p to 0x%p\n",
le32_to_cpu(newext->ee_block),
- le32_to_cpu(newext->ee_start),
+ ext_pblock(newext),
le16_to_cpu(newext->ee_len),
nearex, len, nearex + 1, nearex + 2);
memmove(nearex + 2, nearex + 1, len);
@@ -1165,10 +1198,10 @@ has_space:
BUG_ON(newext->ee_block == nearex->ee_block);
len = (EXT_MAX_EXTENT(eh) - nearex) * sizeof(struct ext3_extent);
len = len < 0 ? 0 : len;
- ext_debug("insert %d:%d:%d before: nearest 0x%p, "
+ ext_debug("insert %d:%lld:%d before: nearest 0x%p, "
"move %d from 0x%p to 0x%p\n",
le32_to_cpu(newext->ee_block),
- le32_to_cpu(newext->ee_start),
+ ext_pblock(newext),
le16_to_cpu(newext->ee_len),
nearex, len, nearex + 1, nearex + 2);
memmove(nearex + 1, nearex, len);
@@ -1179,9 +1212,8 @@ has_space:
nearex = path[depth].p_ext;
nearex->ee_block = newext->ee_block;
nearex->ee_start = newext->ee_start;
+ nearex->ee_start_hi = newext->ee_start_hi;
nearex->ee_len = newext->ee_len;
- /* FIXME: support for large fs */
- nearex->ee_start_hi = 0;

merge:
/* try to merge extents to the right */
@@ -1290,7 +1322,7 @@ int ext3_ext_walk_space(struct inode *in
} else {
cbex.ec_block = le32_to_cpu(ex->ee_block);
cbex.ec_len = le16_to_cpu(ex->ee_len);
- cbex.ec_start = le32_to_cpu(ex->ee_start);
+ cbex.ec_start = ext_pblock(ex);
cbex.ec_type = EXT3_EXT_CACHE_EXTENT;
}

@@ -1398,7 +1430,7 @@ ext3_ext_in_cache(struct inode *inode, u
cex->ec_type != EXT3_EXT_CACHE_EXTENT);
if (block >= cex->ec_block && block < cex->ec_block + cex->ec_len) {
ex->ee_block = cpu_to_le32(cex->ec_block);
- ex->ee_start = cpu_to_le32(cex->ec_start);
+ ext3_ext_store_pblock(ex, cex->ec_start);
ex->ee_len = cpu_to_le16(cex->ec_len);
ext_debug("%lu cached by %lu:%lu:%lu\n",
(unsigned long) block,
@@ -1426,7 +1458,7 @@ int ext3_ext_rm_idx(handle_t *handle, st

/* free index block */
path--;
- leaf = le32_to_cpu(path->p_idx->ei_leaf);
+ leaf = idx_pblock(path->p_idx);
BUG_ON(path->p_hdr->eh_entries == 0);
if ((err = ext3_ext_get_access(handle, inode, path)))
return err;
@@ -1517,7 +1549,7 @@ static int ext3_remove_blocks(handle_t *
/* tail removal */
unsigned long num, start;
num = le32_to_cpu(ex->ee_block) + le16_to_cpu(ex->ee_len) - from;
- start = le32_to_cpu(ex->ee_start) + le16_to_cpu(ex->ee_len) - num;
+ start = ext_pblock(ex) + le16_to_cpu(ex->ee_len) - num;
ext_debug("free last %lu blocks starting %lu\n", num, start);
for (i = 0; i < num; i++) {
bh = sb_find_get_block(inode->i_sb, start + i);
@@ -1621,7 +1653,7 @@ ext3_ext_rm_leaf(handle_t *handle, struc

if (num == 0) {
/* this extent is removed entirely mark slot unused */
- ex->ee_start = 0;
+ ext3_ext_store_pblock(ex, 0);
eh->eh_entries = cpu_to_le16(le16_to_cpu(eh->eh_entries)-1);
}

@@ -1632,8 +1664,8 @@ ext3_ext_rm_leaf(handle_t *handle, struc
if (err)
goto out;

- ext_debug("new extent: %u:%u:%u\n", block, num,
- le32_to_cpu(ex->ee_start));
+ ext_debug("new extent: %u:%u:%llu\n", block, num,
+ ext_pblock(ex));
ex--;
ex_ee_block = le32_to_cpu(ex->ee_block);
ex_ee_len = le16_to_cpu(ex->ee_len);
@@ -1748,11 +1780,11 @@ int ext3_ext_remove_space(struct inode *
path[i].p_idx);
if (ext3_ext_more_to_rm(path + i)) {
/* go to the next level */
- ext_debug("move to level %d (block %d)\n",
- i + 1, le32_to_cpu(path[i].p_idx->ei_leaf));
+ ext_debug("move to level %d (block %llu)\n",
+ i + 1, idx_pblock(path[i].p_idx));
memset(path + i + 1, 0, sizeof(*path));
path[i+1].p_bh =
- sb_bread(sb, le32_to_cpu(path[i].p_idx->ei_leaf));
+ sb_bread(sb, idx_pblock(path[i].p_idx));
if (!path[i+1].p_bh) {
/* should we reset i_size? */
err = -EIO;
@@ -1878,7 +1910,7 @@ int ext3_ext_get_blocks(handle_t *handle
/* block is already allocated */
newblock = iblock
- le32_to_cpu(newex.ee_block)
- + le32_to_cpu(newex.ee_start);
+ + ext_pblock(&newex);
/* number of remain blocks in the extent */
allocated = le16_to_cpu(newex.ee_len) -
(iblock - le32_to_cpu(newex.ee_block));
@@ -1907,7 +1939,7 @@ int ext3_ext_get_blocks(handle_t *handle

if ((ex = path[depth].p_ext)) {
unsigned long ee_block = le32_to_cpu(ex->ee_block);
- unsigned long ee_start = le32_to_cpu(ex->ee_start);
+ unsigned long ee_start = ext_pblock(ex);
unsigned short ee_len = le16_to_cpu(ex->ee_len);
/* if found exent covers block, simple return it */
if (iblock >= ee_block && iblock < ee_block + ee_len) {
@@ -1943,7 +1975,7 @@ int ext3_ext_get_blocks(handle_t *handle

/* try to insert new extent into found leaf and return */
newex.ee_block = cpu_to_le32(iblock);
- newex.ee_start = cpu_to_le32(newblock);
+ ext3_ext_store_pblock(&newex, newblock);
newex.ee_len = cpu_to_le16(allocated);
err = ext3_ext_insert_extent(handle, inode, path, &newex);
if (err)
@@ -1953,7 +1985,7 @@ int ext3_ext_get_blocks(handle_t *handle
EXT3_I(inode)->i_disksize = inode->i_size;

/* previous routine could use block we allocated */
- newblock = le32_to_cpu(newex.ee_start);
+ newblock = ext_pblock(&newex);
__set_bit(BH_New, &bh_result->b_state);

ext3_ext_put_in_cache(inode, iblock, allocated, newblock,
diff -puN include/linux/ext3_fs_extents.h~ext3-extents-48bit include/linux/ext3_fs_extents.h
--- linux-2.6.17/include/linux/ext3_fs_extents.h~ext3-extents-48bit 2006-06-28 16:46:39.851883223 -0700
+++ linux-2.6.17-ming/include/linux/ext3_fs_extents.h 2006-06-28 16:46:39.864881731 -0700
@@ -108,7 +108,7 @@ struct ext3_extent_header {
* truncate uses it to simulate recursive walking
*/
struct ext3_ext_path {
- __u32 p_block;
+ __u64 p_block;
__u16 p_depth;
struct ext3_extent *p_ext;
struct ext3_extent_idx *p_idx;
diff -puN include/linux/ext3_fs_i.h~ext3-extents-48bit include/linux/ext3_fs_i.h
--- linux-2.6.17/include/linux/ext3_fs_i.h~ext3-extents-48bit 2006-06-28 16:46:39.855882764 -0700
+++ linux-2.6.17-ming/include/linux/ext3_fs_i.h 2006-06-28 16:46:39.864881731 -0700
@@ -68,7 +68,7 @@ struct ext3_block_alloc_info {
* storage for cached extent
*/
struct ext3_ext_cache {
- __u32 ec_start;
+ sector_t ec_start;
__u32 ec_block;
__u32 ec_len; /* must be 32bit to return holes */
__u32 ec_type;
_


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