Linux Archive - GFS2: combine gfs2_alloc_block and gfs2_alloc

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- - GFS2: combine gfs2_alloc_block and gfs2_alloc_di (http://www.linux-archive.org/cluster-development/598331-gfs2-combine-gfs2_alloc_block-gfs2_alloc_di.html)

GFS2: combine gfs2_alloc_block and gfs2_alloc_di

Hi,

GFS2 functions gfs2_alloc_block and gfs2_alloc_di do basically
the same things, with a few exceptions. This patch combines
the two functions into a slightly more generic gfs2_alloc_block.
Having one centralized block allocation function will reduce
code redundancy and make it easier to implement multi-block
reservations to reduce file fragmentation in the future.

Regards,

Bob Peterson
Red Hat File Systems
--
diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index f6be14f..b69235b 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -133,7 +133,7 @@ int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page)
and write it out to disk */

unsigned int n = 1;
- error = gfs2_alloc_block(ip, &block, &n);
+ error = gfs2_alloc_block(ip, &block, &n, 0, NULL);
if (error)
goto out_brelse;
if (isdir) {
@@ -503,7 +503,7 @@ static int gfs2_bmap_alloc(struct inode *inode, const sector_t lblock,
do {
int error;
n = blks - alloced;
- error = gfs2_alloc_block(ip, &bn, &n);
+ error = gfs2_alloc_block(ip, &bn, &n, 0, NULL);
if (error)
return error;
alloced += n;
diff --git a/fs/gfs2/dir.c b/fs/gfs2/dir.c
index 946b6f8..ae75319 100644
--- a/fs/gfs2/dir.c
+++ b/fs/gfs2/dir.c
@@ -823,7 +823,7 @@ static struct gfs2_leaf *new_leaf(struct inode *inode, struct buffer_head **pbh,
struct gfs2_dirent *dent;
struct qstr name = { .name = "", .len = 0, .hash = 0 };

- error = gfs2_alloc_block(ip, &bn, &n);
+ error = gfs2_alloc_block(ip, &bn, &n, 0, NULL);
if (error)
return NULL;
bh = gfs2_meta_new(ip->i_gl, bn);
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index 377920d..de2668f 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -402,7 +402,7 @@ static int alloc_dinode(struct gfs2_inode *dip, u64 *no_addr, u64 *generation)
if (error)
goto out_ipreserv;

- error = gfs2_alloc_di(dip, no_addr, generation);
+ error = gfs2_alloc_block(dip, no_addr, NULL, 1, generation);

gfs2_trans_end(sdp);

diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index a1a815b..995f4e6 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -1304,19 +1304,24 @@ static void gfs2_rgrp_error(struct gfs2_rgrpd *rgd)
* @ip: the inode to allocate the block for
* @bn: Used to return the starting block number
* @n: requested number of blocks/extent length (value/result)
+ * dinode: 1 if we're allocating a dinode, 0 if it's a data block
+ * @generation: the generation number of the inode
*
* Returns: 0 or error
*/

-int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n)
+int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n,
+ int dinode, u64 *generation)
{
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
struct buffer_head *dibh;
struct gfs2_alloc *al = ip->i_alloc;
struct gfs2_rgrpd *rgd;
- u32 goal, blk;
- u64 block;
+ u32 goal, blk; /* block, within the rgrp scope */
+ u64 block; /* block, within the file system scope */
+ unsigned int extn = 1;
int error;
+ unsigned char blk_type = dinode ? GFS2_BLKST_DINODE : GFS2_BLKST_USED;

/* Only happens if there is a bug in gfs2, return something distinctive
* to ensure that it is noticed.
@@ -1324,14 +1329,16 @@ int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n)
if (al == NULL)
return -ECANCELED;

+ if (n == NULL)
+ n = &extn;
rgd = ip->i_rgd;

- if (rgrp_contains_block(rgd, ip->i_goal))
+ if (!dinode && rgrp_contains_block(rgd, ip->i_goal))
goal = ip->i_goal - rgd->rd_data0;
else
goal = rgd->rd_last_alloc;

- blk = rgblk_search(rgd, goal, GFS2_BLKST_FREE, GFS2_BLKST_USED, n);
+ blk = rgblk_search(rgd, goal, GFS2_BLKST_FREE, blk_type, n);

/* Since all blocks are reserved in advance, this shouldn't happen */
if (blk == BFITNOENT)
@@ -1339,82 +1346,43 @@ int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n)

rgd->rd_last_alloc = blk;
block = rgd->rd_data0 + blk;
- ip->i_goal = block + *n - 1;
- error = gfs2_meta_inode_buffer(ip, &dibh);
- if (error == 0) {
- struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
- gfs2_trans_add_bh(ip->i_gl, dibh, 1);
- di->di_goal_meta = di->di_goal_data = cpu_to_be64(ip->i_goal);
- brelse(dibh);
+ if (!dinode) {
+ ip->i_goal = block + *n - 1;
+ error = gfs2_meta_inode_buffer(ip, &dibh);
+ if (error == 0) {
+ struct gfs2_dinode *di =
+ (struct gfs2_dinode *)dibh->b_data;
+ gfs2_trans_add_bh(ip->i_gl, dibh, 1);
+ di->di_goal_meta = di->di_goal_data =
+ cpu_to_be64(ip->i_goal);
+ brelse(dibh);
+ }
}
if (rgd->rd_free < *n)
goto rgrp_error;

rgd->rd_free -= *n;
+ if (dinode) {
+ rgd->rd_dinodes++;
+ *generation = rgd->rd_igeneration++;
+ if (*generation == 0)
+ *generation = rgd->rd_igeneration++;
+ }

gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);

al->al_alloced += *n;

- gfs2_statfs_change(sdp, 0, -(s64)*n, 0);
- gfs2_quota_change(ip, *n, ip->i_inode.i_uid, ip->i_inode.i_gid);
+ gfs2_statfs_change(sdp, 0, -(s64)*n, dinode ? 1 : 0);
+ if (dinode)
+ gfs2_trans_add_unrevoke(sdp, block, 1);
+ else
+ gfs2_quota_change(ip, *n, ip->i_inode.i_uid,
+ ip->i_inode.i_gid);

rgd->rd_free_clone -= *n;
- trace_gfs2_block_alloc(ip, block, *n, GFS2_BLKST_USED);
- *bn = block;
- return 0;
-
-rgrp_error:
- gfs2_rgrp_error(rgd);
- return -EIO;
-}
-
-/**
- * gfs2_alloc_di - Allocate a dinode
- * @dip: the directory that the inode is going in
- * @bn: the block number which is allocated
- * @generation: the generation number of the inode
- *
- * Returns: 0 on success or error
- */
-
-int gfs2_alloc_di(struct gfs2_inode *dip, u64 *bn, u64 *generation)
-{
- struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
- struct gfs2_alloc *al = dip->i_alloc;
- struct gfs2_rgrpd *rgd = dip->i_rgd;
- u32 blk;
- u64 block;
- unsigned int n = 1;
-
- blk = rgblk_search(rgd, rgd->rd_last_alloc,
- GFS2_BLKST_FREE, GFS2_BLKST_DINODE, &n);
-
- /* Since all blocks are reserved in advance, this shouldn't happen */
- if (blk == BFITNOENT)
- goto rgrp_error;
-
- rgd->rd_last_alloc = blk;
- block = rgd->rd_data0 + blk;
- if (rgd->rd_free == 0)
- goto rgrp_error;
-
- rgd->rd_free--;
- rgd->rd_dinodes++;
- *generation = rgd->rd_igeneration++;
- if (*generation == 0)
- *generation = rgd->rd_igeneration++;
- gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
- gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
-
- al->al_alloced++;
-
- gfs2_statfs_change(sdp, 0, -1, +1);
- gfs2_trans_add_unrevoke(sdp, block, 1);
-
- rgd->rd_free_clone--;
- trace_gfs2_block_alloc(dip, block, 1, GFS2_BLKST_DINODE);
+ trace_gfs2_block_alloc(ip, block, *n, blk_type);
*bn = block;
return 0;

diff --git a/fs/gfs2/rgrp.h b/fs/gfs2/rgrp.h
index cf5c501..4cb5608 100644
--- a/fs/gfs2/rgrp.h
+++ b/fs/gfs2/rgrp.h
@@ -39,8 +39,8 @@ static inline void gfs2_alloc_put(struct gfs2_inode *ip)
extern int gfs2_inplace_reserve(struct gfs2_inode *ip);
extern void gfs2_inplace_release(struct gfs2_inode *ip);

-extern int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n);
-extern int gfs2_alloc_di(struct gfs2_inode *ip, u64 *bn, u64 *generation);
+extern int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n,
+ int dinode, u64 *generation);

extern void __gfs2_free_blocks(struct gfs2_inode *ip, u64 bstart, u32 blen, int meta);
extern void gfs2_free_meta(struct gfs2_inode *ip, u64 bstart, u32 blen);
diff --git a/fs/gfs2/xattr.c b/fs/gfs2/xattr.c
index a201a1d..e4794a5 100644
--- a/fs/gfs2/xattr.c
+++ b/fs/gfs2/xattr.c
@@ -610,7 +610,7 @@ static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
u64 block;
int error;

- error = gfs2_alloc_block(ip, &block, &n);
+ error = gfs2_alloc_block(ip, &block, &n, 0, NULL);
if (error)
return error;
gfs2_trans_add_unrevoke(sdp, block, 1);
@@ -672,7 +672,7 @@ static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
int mh_size = sizeof(struct gfs2_meta_header);
unsigned int n = 1;

- error = gfs2_alloc_block(ip, &block, &n);
+ error = gfs2_alloc_block(ip, &block, &n, 0, NULL);
if (error)
return error;
gfs2_trans_add_unrevoke(sdp, block, 1);
@@ -992,7 +992,7 @@ static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
} else {
u64 blk;
unsigned int n = 1;
- error = gfs2_alloc_block(ip, &blk, &n);
+ error = gfs2_alloc_block(ip, &blk, &n, 0, NULL);
if (error)
return error;
gfs2_trans_add_unrevoke(sdp, blk, 1);

GFS2: combine gfs2_alloc_block and gfs2_alloc_di

----- Original Message -----
| Hi,
|
| As a follow up to this patch, I'd quite like to see rgblk_search
| split
| into two functions. One to do the search and another to actually make
| changes to the bitmap when a block is found. That should help
| development of further alloc changes on top.
|
| Also, if someone requests allocation of an extent > 1 block with an
| inode type, then only the first block should be set to being an
| inode,
| the others should be set to "used" and the various stats should be
| updated accordingly. Otherwise it will never be possible to ask for
| more
| than a single block when an inode is being allocated,
|
| Steve.

Hi,

Good suggestions. Hopefully I'll post a patch or two soon.
In the meantime, here's a clean-up for one of the patches.
I should have done this in the first place.

Regards,

Bob Peterson
Red Hat File Systems
--
commit e5091d2b20b98424cb6924ec499bdf5c5bc5827d
Author: Bob Peterson <rpeterso@redhat.com>
Date: Wed Nov 16 08:17:33 2011 -0600

GFS2: Clean up gfs2_block_alloc by passing in block type

This patch simplifies function gfs2_block_alloc by making its
callers pass in the requested block type rather than a flag to be
translated as a block type.

diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index b69235b..491e1f2 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -133,7 +133,7 @@ int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page)
and write it out to disk */

unsigned int n = 1;
- error = gfs2_alloc_block(ip, &block, &n, 0, NULL);
+ error = gfs2_alloc_block(ip, &block, &n, GFS2_BLKST_USED, NULL);
if (error)
goto out_brelse;
if (isdir) {
@@ -503,7 +503,7 @@ static int gfs2_bmap_alloc(struct inode *inode, const sector_t lblock,
do {
int error;
n = blks - alloced;
- error = gfs2_alloc_block(ip, &bn, &n, 0, NULL);
+ error = gfs2_alloc_block(ip, &bn, &n, GFS2_BLKST_USED, NULL);
if (error)
return error;
alloced += n;
diff --git a/fs/gfs2/dir.c b/fs/gfs2/dir.c
index ae75319..c38b32c 100644
--- a/fs/gfs2/dir.c
+++ b/fs/gfs2/dir.c
@@ -823,7 +823,7 @@ static struct gfs2_leaf *new_leaf(struct inode *inode, struct buffer_head **pbh,
struct gfs2_dirent *dent;
struct qstr name = { .name = "", .len = 0, .hash = 0 };

- error = gfs2_alloc_block(ip, &bn, &n, 0, NULL);
+ error = gfs2_alloc_block(ip, &bn, &n, GFS2_BLKST_USED, NULL);
if (error)
return NULL;
bh = gfs2_meta_new(ip->i_gl, bn);
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index de2668f..25b6657 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -402,7 +402,8 @@ static int alloc_dinode(struct gfs2_inode *dip, u64 *no_addr, u64 *generation)
if (error)
goto out_ipreserv;

- error = gfs2_alloc_block(dip, no_addr, NULL, 1, generation);
+ error = gfs2_alloc_block(dip, no_addr, NULL, GFS2_BLKST_DINODE,
+ generation);

gfs2_trans_end(sdp);

diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index 995f4e6..abac4bd 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -1311,7 +1311,7 @@ static void gfs2_rgrp_error(struct gfs2_rgrpd *rgd)
*/

int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n,
- int dinode, u64 *generation)
+ unsigned char blk_type, u64 *generation)
{
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
struct buffer_head *dibh;
@@ -1321,7 +1321,6 @@ int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n,
u64 block; /* block, within the file system scope */
unsigned int extn = 1;
int error;
- unsigned char blk_type = dinode ? GFS2_BLKST_DINODE : GFS2_BLKST_USED;

/* Only happens if there is a bug in gfs2, return something distinctive
* to ensure that it is noticed.
@@ -1333,7 +1332,7 @@ int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n,
n = &extn;
rgd = ip->i_rgd;

- if (!dinode && rgrp_contains_block(rgd, ip->i_goal))
+ if (blk_type == GFS2_BLKST_USED && rgrp_contains_block(rgd, ip->i_goal))
goal = ip->i_goal - rgd->rd_data0;
else
goal = rgd->rd_last_alloc;
@@ -1346,7 +1345,7 @@ int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n,

rgd->rd_last_alloc = blk;
block = rgd->rd_data0 + blk;
- if (!dinode) {
+ if (blk_type == GFS2_BLKST_USED) {
ip->i_goal = block + *n - 1;
error = gfs2_meta_inode_buffer(ip, &dibh);
if (error == 0) {
@@ -1362,7 +1361,7 @@ int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n,
goto rgrp_error;

rgd->rd_free -= *n;
- if (dinode) {
+ if (blk_type == GFS2_BLKST_DINODE) {
rgd->rd_dinodes++;
*generation = rgd->rd_igeneration++;
if (*generation == 0)
@@ -1374,8 +1373,8 @@ int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n,

al->al_alloced += *n;

- gfs2_statfs_change(sdp, 0, -(s64)*n, dinode ? 1 : 0);
- if (dinode)
+ gfs2_statfs_change(sdp, 0, -(s64)*n, (blk_type == GFS2_BLKST_DINODE));
+ if (blk_type == GFS2_BLKST_DINODE)
gfs2_trans_add_unrevoke(sdp, block, 1);
else
gfs2_quota_change(ip, *n, ip->i_inode.i_uid,
diff --git a/fs/gfs2/rgrp.h b/fs/gfs2/rgrp.h
index 4cb5608..6a81011 100644
--- a/fs/gfs2/rgrp.h
+++ b/fs/gfs2/rgrp.h
@@ -40,7 +40,7 @@ extern int gfs2_inplace_reserve(struct gfs2_inode *ip);
extern void gfs2_inplace_release(struct gfs2_inode *ip);

extern int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n,
- int dinode, u64 *generation);
+ unsigned char blk_type, u64 *generation);

extern void __gfs2_free_blocks(struct gfs2_inode *ip, u64 bstart, u32 blen, int meta);
extern void gfs2_free_meta(struct gfs2_inode *ip, u64 bstart, u32 blen);
diff --git a/fs/gfs2/xattr.c b/fs/gfs2/xattr.c
index e4794a5..f2b77b4 100644
--- a/fs/gfs2/xattr.c
+++ b/fs/gfs2/xattr.c
@@ -610,7 +610,7 @@ static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
u64 block;
int error;

- error = gfs2_alloc_block(ip, &block, &n, 0, NULL);
+ error = gfs2_alloc_block(ip, &block, &n, GFS2_BLKST_USED, NULL);
if (error)
return error;
gfs2_trans_add_unrevoke(sdp, block, 1);
@@ -672,7 +672,8 @@ static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
int mh_size = sizeof(struct gfs2_meta_header);
unsigned int n = 1;

- error = gfs2_alloc_block(ip, &block, &n, 0, NULL);
+ error = gfs2_alloc_block(ip, &block, &n,
+ GFS2_BLKST_USED, NULL);
if (error)
return error;
gfs2_trans_add_unrevoke(sdp, block, 1);
@@ -992,7 +993,7 @@ static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
} else {
u64 blk;
unsigned int n = 1;
- error = gfs2_alloc_block(ip, &blk, &n, 0, NULL);
+ error = gfs2_alloc_block(ip, &blk, &n, GFS2_BLKST_USED, NULL);
if (error)
return error;
gfs2_trans_add_unrevoke(sdp, blk, 1);

GFS2: combine gfs2_alloc_block and gfs2_alloc_di

----- Original Message -----
| It is not a good plan to rely on this to give us 0 and 1 inode
| counts.
| Using the ?: as before would be better. I suspect that if you
| maintain
| separate counts of inodes (which can be 0 or 1 only) and other blocks
| (any number) calculated at the start of the function then a number of
| the tests you need to do will just become 0 or non-zero on one or
| other
| other of these.
|
| Also, it would be a good plan to always pass the extent size in, even
| if
| the caller is requesting only a single block, then there is no need
| for
| a NULL test,
|
| Steve.

Hi,

Okay, scratch that then. How about something like the following patch?

This patch moves more toward a generic multi-block allocator that
takes a pointer to the number of data blocks to allocate, plus whether
or not to allocate a dinode. In theory, it could be called to allocate
(1) a single dinode block, (2) a group of one or more data blocks, or
(3) a dinode plus several data blocks.

Regards,

Bob Peterson
Red Hat File Systems
--
fs/gfs2/bmap.c | 4 +-
fs/gfs2/dir.c | 2 +-
fs/gfs2/inode.c | 3 +-
fs/gfs2/rgrp.c | 58 +++++++++++++++++++++++++++++-------------------------
fs/gfs2/rgrp.h | 4 +-
fs/gfs2/xattr.c | 6 ++--
6 files changed, 41 insertions(+), 36 deletions(-)

diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index b69235b..cb74312 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -133,7 +133,7 @@ int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page)
and write it out to disk */

unsigned int n = 1;
- error = gfs2_alloc_block(ip, &block, &n, 0, NULL);
+ error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
if (error)
goto out_brelse;
if (isdir) {
@@ -503,7 +503,7 @@ static int gfs2_bmap_alloc(struct inode *inode, const sector_t lblock,
do {
int error;
n = blks - alloced;
- error = gfs2_alloc_block(ip, &bn, &n, 0, NULL);
+ error = gfs2_alloc_blocks(ip, &bn, &n, 0, NULL);
if (error)
return error;
alloced += n;
diff --git a/fs/gfs2/dir.c b/fs/gfs2/dir.c
index ae75319..f8485da 100644
--- a/fs/gfs2/dir.c
+++ b/fs/gfs2/dir.c
@@ -823,7 +823,7 @@ static struct gfs2_leaf *new_leaf(struct inode *inode, struct buffer_head **pbh,
struct gfs2_dirent *dent;
struct qstr name = { .name = "", .len = 0, .hash = 0 };

- error = gfs2_alloc_block(ip, &bn, &n, 0, NULL);
+ error = gfs2_alloc_blocks(ip, &bn, &n, 0, NULL);
if (error)
return NULL;
bh = gfs2_meta_new(ip->i_gl, bn);
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index de2668f..3ab192b 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -389,6 +389,7 @@ static int alloc_dinode(struct gfs2_inode *dip, u64 *no_addr, u64 *generation)
{
struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
int error;
+ int dblocks = 0;

if (gfs2_alloc_get(dip) == NULL)
return -ENOMEM;
@@ -402,7 +403,7 @@ static int alloc_dinode(struct gfs2_inode *dip, u64 *no_addr, u64 *generation)
if (error)
goto out_ipreserv;

- error = gfs2_alloc_block(dip, no_addr, NULL, 1, generation);
+ error = gfs2_alloc_blocks(dip, no_addr, &dblocks, 1, generation);

gfs2_trans_end(sdp);

diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index 995f4e6..131289b 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -65,8 +65,8 @@ static const char valid_change[16] = {
};

static u32 rgblk_search(struct gfs2_rgrpd *rgd, u32 goal,
- unsigned char old_state, unsigned char new_state,
- unsigned int *n);
+ unsigned char old_state, bool dinode,
+ unsigned int *ndata);

/**
* gfs2_setbit - Set a bit in the bitmaps
@@ -921,8 +921,7 @@ static void try_rgrp_unlink(struct gfs2_rgrpd *rgd, u64 *last_unlinked, u64 skip
while (goal < rgd->rd_data) {
down_write(&sdp->sd_log_flush_lock);
n = 1;
- block = rgblk_search(rgd, goal, GFS2_BLKST_UNLINKED,
- GFS2_BLKST_UNLINKED, &n);
+ block = rgblk_search(rgd, goal, GFS2_BLKST_UNLINKED, 0, &n);
up_write(&sdp->sd_log_flush_lock);
if (block == BFITNOENT)
break;
@@ -1115,7 +1114,7 @@ static unsigned char gfs2_get_block_type(struct gfs2_rgrpd *rgd, u64 block)
* @rgd: the resource group descriptor
* @goal: the goal block within the RG (start here to search for avail block)
* @old_state: GFS2_BLKST_XXX the before-allocation state to find
- * @new_state: GFS2_BLKST_XXX the after-allocation block state
+ * dinode: TRUE if the first block we allocate is for a dinode
* @n: The extent length
*
* Walk rgrp's bitmap to find bits that represent a block in @old_state.
@@ -1132,8 +1131,7 @@ static unsigned char gfs2_get_block_type(struct gfs2_rgrpd *rgd, u64 block)
*/

static u32 rgblk_search(struct gfs2_rgrpd *rgd, u32 goal,
- unsigned char old_state, unsigned char new_state,
- unsigned int *n)
+ unsigned char old_state, bool dinode, unsigned int *n)
{
struct gfs2_bitmap *bi = NULL;
const u32 length = rgd->rd_length;
@@ -1141,7 +1139,14 @@ static u32 rgblk_search(struct gfs2_rgrpd *rgd, u32 goal,
unsigned int buf, x;
const unsigned int elen = *n;
const u8 *buffer = NULL;
+ unsigned char new_state;

+ if (old_state == GFS2_BLKST_UNLINKED)
+ new_state = GFS2_BLKST_UNLINKED;
+ else if (dinode)
+ new_state = GFS2_BLKST_DINODE;
+ else
+ new_state = GFS2_BLKST_USED;
*n = 0;
/* Find bitmap block that contains bits for goal block */
for (buf = 0; buf < length; buf++) {
@@ -1192,13 +1197,15 @@ skip:
if (blk == BFITNOENT)
return blk;

- *n = 1;
if (old_state == new_state)
goto out;

gfs2_trans_add_bh(rgd->rd_gl, bi->bi_bh, 1);
gfs2_setbit(rgd, bi->bi_bh->b_data, bi->bi_clone, bi->bi_offset,
bi, blk, new_state);
+ if (new_state == GFS2_BLKST_USED)
+ *n = 1;
+ new_state = GFS2_BLKST_USED; /* for extents, we need data blocks */
goal = blk;
while (*n < elen) {
goal++;
@@ -1300,18 +1307,18 @@ static void gfs2_rgrp_error(struct gfs2_rgrpd *rgd)
}

/**
- * gfs2_alloc_block - Allocate one or more blocks
+ * gfs2_alloc_blocks - Allocate one or more blocks of data and/or a dinode
* @ip: the inode to allocate the block for
* @bn: Used to return the starting block number
- * @n: requested number of blocks/extent length (value/result)
- * dinode: 1 if we're allocating a dinode, 0 if it's a data block
+ * @ndata: requested number of data blocks/extent length (value/result)
+ * dinode: 1 if we're allocating a dinode block, else 0
* @generation: the generation number of the inode
*
* Returns: 0 or error
*/

-int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n,
- int dinode, u64 *generation)
+int gfs2_alloc_blocks(struct gfs2_inode *ip, u64 *bn, unsigned int *ndata,
+ bool dinode, u64 *generation)
{
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
struct buffer_head *dibh;
@@ -1319,9 +1326,7 @@ int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n,
struct gfs2_rgrpd *rgd;
u32 goal, blk; /* block, within the rgrp scope */
u64 block; /* block, within the file system scope */
- unsigned int extn = 1;
int error;
- unsigned char blk_type = dinode ? GFS2_BLKST_DINODE : GFS2_BLKST_USED;

/* Only happens if there is a bug in gfs2, return something distinctive
* to ensure that it is noticed.
@@ -1329,8 +1334,6 @@ int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n,
if (al == NULL)
return -ECANCELED;

- if (n == NULL)
- n = &extn;
rgd = ip->i_rgd;

if (!dinode && rgrp_contains_block(rgd, ip->i_goal))
@@ -1338,7 +1341,7 @@ int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n,
else
goal = rgd->rd_last_alloc;

- blk = rgblk_search(rgd, goal, GFS2_BLKST_FREE, blk_type, n);
+ blk = rgblk_search(rgd, goal, GFS2_BLKST_FREE, dinode, ndata);

/* Since all blocks are reserved in advance, this shouldn't happen */
if (blk == BFITNOENT)
@@ -1347,7 +1350,7 @@ int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n,
rgd->rd_last_alloc = blk;
block = rgd->rd_data0 + blk;
if (!dinode) {
- ip->i_goal = block + *n - 1;
+ ip->i_goal = block + *ndata - 1;
error = gfs2_meta_inode_buffer(ip, &dibh);
if (error == 0) {
struct gfs2_dinode *di =
@@ -1358,11 +1361,12 @@ int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n,
brelse(dibh);
}
}
- if (rgd->rd_free < *n)
+ if (rgd->rd_free < (*ndata) + dinode)
goto rgrp_error;

- rgd->rd_free -= *n;
+ rgd->rd_free -= *ndata;
if (dinode) {
+ rgd->rd_free--;
rgd->rd_dinodes++;
*generation = rgd->rd_igeneration++;
if (*generation == 0)
@@ -1372,17 +1376,17 @@ int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n,
gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);

- al->al_alloced += *n;
+ al->al_alloced += (*ndata) + dinode;

- gfs2_statfs_change(sdp, 0, -(s64)*n, dinode ? 1 : 0);
+ gfs2_statfs_change(sdp, 0, (-(s64)((*ndata) + dinode)), dinode);
if (dinode)
gfs2_trans_add_unrevoke(sdp, block, 1);
- else
- gfs2_quota_change(ip, *n, ip->i_inode.i_uid,
+ if (*ndata)
+ gfs2_quota_change(ip, *ndata, ip->i_inode.i_uid,
ip->i_inode.i_gid);

- rgd->rd_free_clone -= *n;
- trace_gfs2_block_alloc(ip, block, *n, blk_type);
+ rgd->rd_free_clone -= (*ndata) + dinode;
+ trace_gfs2_block_alloc(ip, block, *ndata, dinode);
*bn = block;
return 0;

diff --git a/fs/gfs2/rgrp.h b/fs/gfs2/rgrp.h
index 4cb5608..b3b61b8 100644
--- a/fs/gfs2/rgrp.h
+++ b/fs/gfs2/rgrp.h
@@ -39,8 +39,8 @@ static inline void gfs2_alloc_put(struct gfs2_inode *ip)
extern int gfs2_inplace_reserve(struct gfs2_inode *ip);
extern void gfs2_inplace_release(struct gfs2_inode *ip);

-extern int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n,
- int dinode, u64 *generation);
+extern int gfs2_alloc_blocks(struct gfs2_inode *ip, u64 *bn, unsigned int *n,
+ bool dinode, u64 *generation);

extern void __gfs2_free_blocks(struct gfs2_inode *ip, u64 bstart, u32 blen, int meta);
extern void gfs2_free_meta(struct gfs2_inode *ip, u64 bstart, u32 blen);
diff --git a/fs/gfs2/xattr.c b/fs/gfs2/xattr.c
index e4794a5..ef74e159 100644
--- a/fs/gfs2/xattr.c
+++ b/fs/gfs2/xattr.c
@@ -610,7 +610,7 @@ static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
u64 block;
int error;

- error = gfs2_alloc_block(ip, &block, &n, 0, NULL);
+ error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
if (error)
return error;
gfs2_trans_add_unrevoke(sdp, block, 1);
@@ -672,7 +672,7 @@ static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
int mh_size = sizeof(struct gfs2_meta_header);
unsigned int n = 1;

- error = gfs2_alloc_block(ip, &block, &n, 0, NULL);
+ error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
if (error)
return error;
gfs2_trans_add_unrevoke(sdp, block, 1);
@@ -992,7 +992,7 @@ static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
} else {
u64 blk;
unsigned int n = 1;
- error = gfs2_alloc_block(ip, &blk, &n, 0, NULL);
+ error = gfs2_alloc_blocks(ip, &blk, &n, 0, NULL);
if (error)
return error;
gfs2_trans_add_unrevoke(sdp, blk, 1);

GFS2: combine gfs2_alloc_block and gfs2_alloc_di

----- Original Message -----
| Hi,
|
| Yes, but lets make gfs2_alloc_extent() a totally separate function
| and
| not call it from rgblk_search, that way when looking for unlinked
| inodes
| we don't need to care about gfs2_alloc_extent at all. The only issue
| is
| passing a couple of things from rgblk_search to gfs2_alloc_extent
| (the
| bi (either by index or by pointer) and the current position in the
| bitmap.
|
| However my thought was to separate these two completely rather than
| leaving one calling the other,
|
| Steve.

Hi,

Okay, I was afraid that's what you wanted. :) It just seemed
"messy" to me to pass the bi pointers and such, but I'll do it.

Regards,

Bob Peterson
Red Hat File Systems

GFS2: combine gfs2_alloc_block and gfs2_alloc_di

GFS2: combine gfs2_alloc_block and gfs2_alloc_di

From: Bob Peterson <rpeterso@redhat.com>

GFS2 functions gfs2_alloc_block and gfs2_alloc_di do basically
the same things, with a few exceptions. This patch combines
the two functions into a slightly more generic gfs2_alloc_block.
Having one centralized block allocation function will reduce
code redundancy and make it easier to implement multi-block
reservations to reduce file fragmentation in the future.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index f6be14f..b69235b 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -133,7 +133,7 @@ int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page)
and write it out to disk */

unsigned int n = 1;
- error = gfs2_alloc_block(ip, &block, &n);
+ error = gfs2_alloc_block(ip, &block, &n, 0, NULL);
if (error)
goto out_brelse;
if (isdir) {
@@ -503,7 +503,7 @@ static int gfs2_bmap_alloc(struct inode *inode, const sector_t lblock,
do {
int error;
n = blks - alloced;
- error = gfs2_alloc_block(ip, &bn, &n);
+ error = gfs2_alloc_block(ip, &bn, &n, 0, NULL);
if (error)
return error;
alloced += n;
diff --git a/fs/gfs2/dir.c b/fs/gfs2/dir.c
index 946b6f8..ae75319 100644
--- a/fs/gfs2/dir.c
+++ b/fs/gfs2/dir.c
@@ -823,7 +823,7 @@ static struct gfs2_leaf *new_leaf(struct inode *inode, struct buffer_head **pbh,
struct gfs2_dirent *dent;
struct qstr name = { .name = "", .len = 0, .hash = 0 };

- error = gfs2_alloc_block(ip, &bn, &n);
+ error = gfs2_alloc_block(ip, &bn, &n, 0, NULL);
if (error)
return NULL;
bh = gfs2_meta_new(ip->i_gl, bn);
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index 377920d..de2668f 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -402,7 +402,7 @@ static int alloc_dinode(struct gfs2_inode *dip, u64 *no_addr, u64 *generation)
if (error)
goto out_ipreserv;

- error = gfs2_alloc_di(dip, no_addr, generation);
+ error = gfs2_alloc_block(dip, no_addr, NULL, 1, generation);

gfs2_trans_end(sdp);

diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index a1a815b..995f4e6 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -1304,19 +1304,24 @@ static void gfs2_rgrp_error(struct gfs2_rgrpd *rgd)
* @ip: the inode to allocate the block for
* @bn: Used to return the starting block number
* @n: requested number of blocks/extent length (value/result)
+ * dinode: 1 if we're allocating a dinode, 0 if it's a data block
+ * @generation: the generation number of the inode
*
* Returns: 0 or error
*/

-int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n)
+int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n,
+ int dinode, u64 *generation)
{
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
struct buffer_head *dibh;
struct gfs2_alloc *al = ip->i_alloc;
struct gfs2_rgrpd *rgd;
- u32 goal, blk;
- u64 block;
+ u32 goal, blk; /* block, within the rgrp scope */
+ u64 block; /* block, within the file system scope */
+ unsigned int extn = 1;
int error;
+ unsigned char blk_type = dinode ? GFS2_BLKST_DINODE : GFS2_BLKST_USED;

/* Only happens if there is a bug in gfs2, return something distinctive
* to ensure that it is noticed.
@@ -1324,14 +1329,16 @@ int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n)
if (al == NULL)
return -ECANCELED;

+ if (n == NULL)
+ n = &extn;
rgd = ip->i_rgd;

- if (rgrp_contains_block(rgd, ip->i_goal))
+ if (!dinode && rgrp_contains_block(rgd, ip->i_goal))
goal = ip->i_goal - rgd->rd_data0;
else
goal = rgd->rd_last_alloc;

- blk = rgblk_search(rgd, goal, GFS2_BLKST_FREE, GFS2_BLKST_USED, n);
+ blk = rgblk_search(rgd, goal, GFS2_BLKST_FREE, blk_type, n);

/* Since all blocks are reserved in advance, this shouldn't happen */
if (blk == BFITNOENT)
@@ -1339,82 +1346,43 @@ int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n)

rgd->rd_last_alloc = blk;
block = rgd->rd_data0 + blk;
- ip->i_goal = block + *n - 1;
- error = gfs2_meta_inode_buffer(ip, &dibh);
- if (error == 0) {
- struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
- gfs2_trans_add_bh(ip->i_gl, dibh, 1);
- di->di_goal_meta = di->di_goal_data = cpu_to_be64(ip->i_goal);
- brelse(dibh);
+ if (!dinode) {
+ ip->i_goal = block + *n - 1;
+ error = gfs2_meta_inode_buffer(ip, &dibh);
+ if (error == 0) {
+ struct gfs2_dinode *di =
+ (struct gfs2_dinode *)dibh->b_data;
+ gfs2_trans_add_bh(ip->i_gl, dibh, 1);
+ di->di_goal_meta = di->di_goal_data =
+ cpu_to_be64(ip->i_goal);
+ brelse(dibh);
+ }
}
if (rgd->rd_free < *n)
goto rgrp_error;

rgd->rd_free -= *n;
+ if (dinode) {
+ rgd->rd_dinodes++;
+ *generation = rgd->rd_igeneration++;
+ if (*generation == 0)
+ *generation = rgd->rd_igeneration++;
+ }

gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);

al->al_alloced += *n;

- gfs2_statfs_change(sdp, 0, -(s64)*n, 0);
- gfs2_quota_change(ip, *n, ip->i_inode.i_uid, ip->i_inode.i_gid);
+ gfs2_statfs_change(sdp, 0, -(s64)*n, dinode ? 1 : 0);
+ if (dinode)
+ gfs2_trans_add_unrevoke(sdp, block, 1);
+ else
+ gfs2_quota_change(ip, *n, ip->i_inode.i_uid,
+ ip->i_inode.i_gid);

rgd->rd_free_clone -= *n;
- trace_gfs2_block_alloc(ip, block, *n, GFS2_BLKST_USED);
- *bn = block;
- return 0;
-
-rgrp_error:
- gfs2_rgrp_error(rgd);
- return -EIO;
-}
-
-/**
- * gfs2_alloc_di - Allocate a dinode
- * @dip: the directory that the inode is going in
- * @bn: the block number which is allocated
- * @generation: the generation number of the inode
- *
- * Returns: 0 on success or error
- */
-
-int gfs2_alloc_di(struct gfs2_inode *dip, u64 *bn, u64 *generation)
-{
- struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
- struct gfs2_alloc *al = dip->i_alloc;
- struct gfs2_rgrpd *rgd = dip->i_rgd;
- u32 blk;
- u64 block;
- unsigned int n = 1;
-
- blk = rgblk_search(rgd, rgd->rd_last_alloc,
- GFS2_BLKST_FREE, GFS2_BLKST_DINODE, &n);
-
- /* Since all blocks are reserved in advance, this shouldn't happen */
- if (blk == BFITNOENT)
- goto rgrp_error;
-
- rgd->rd_last_alloc = blk;
- block = rgd->rd_data0 + blk;
- if (rgd->rd_free == 0)
- goto rgrp_error;
-
- rgd->rd_free--;
- rgd->rd_dinodes++;
- *generation = rgd->rd_igeneration++;
- if (*generation == 0)
- *generation = rgd->rd_igeneration++;
- gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
- gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
-
- al->al_alloced++;
-
- gfs2_statfs_change(sdp, 0, -1, +1);
- gfs2_trans_add_unrevoke(sdp, block, 1);
-
- rgd->rd_free_clone--;
- trace_gfs2_block_alloc(dip, block, 1, GFS2_BLKST_DINODE);
+ trace_gfs2_block_alloc(ip, block, *n, blk_type);
*bn = block;
return 0;

diff --git a/fs/gfs2/rgrp.h b/fs/gfs2/rgrp.h
index cf5c501..4cb5608 100644
--- a/fs/gfs2/rgrp.h
+++ b/fs/gfs2/rgrp.h
@@ -39,8 +39,8 @@ static inline void gfs2_alloc_put(struct gfs2_inode *ip)
extern int gfs2_inplace_reserve(struct gfs2_inode *ip);
extern void gfs2_inplace_release(struct gfs2_inode *ip);

-extern int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n);
-extern int gfs2_alloc_di(struct gfs2_inode *ip, u64 *bn, u64 *generation);
+extern int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n,
+ int dinode, u64 *generation);

extern void __gfs2_free_blocks(struct gfs2_inode *ip, u64 bstart, u32 blen, int meta);
extern void gfs2_free_meta(struct gfs2_inode *ip, u64 bstart, u32 blen);
diff --git a/fs/gfs2/xattr.c b/fs/gfs2/xattr.c
index a201a1d..e4794a5 100644
--- a/fs/gfs2/xattr.c
+++ b/fs/gfs2/xattr.c
@@ -610,7 +610,7 @@ static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
u64 block;
int error;

- error = gfs2_alloc_block(ip, &block, &n);
+ error = gfs2_alloc_block(ip, &block, &n, 0, NULL);
if (error)
return error;
gfs2_trans_add_unrevoke(sdp, block, 1);
@@ -672,7 +672,7 @@ static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
int mh_size = sizeof(struct gfs2_meta_header);
unsigned int n = 1;

- error = gfs2_alloc_block(ip, &block, &n);
+ error = gfs2_alloc_block(ip, &block, &n, 0, NULL);
if (error)
return error;
gfs2_trans_add_unrevoke(sdp, block, 1);
@@ -992,7 +992,7 @@ static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
} else {
u64 blk;
unsigned int n = 1;
- error = gfs2_alloc_block(ip, &blk, &n);
+ error = gfs2_alloc_block(ip, &blk, &n, 0, NULL);
if (error)
return error;
gfs2_trans_add_unrevoke(sdp, blk, 1);
--
1.7.4