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[GFS2] Reduce inode size by merging fields

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There were three fields being used to keep track of the location
of the most recently allocated block for each inode. These have
been merged into a single field in order to better keep the
data and metadata for an inode close on disk, and also to reduce
the space required for storage.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Steven Whitehouse 2008-02-06 09:25:45 +00:00
parent 9feb7c889f
commit ce276b06e8
4 changed files with 24 additions and 38 deletions
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4
fs/gfs2/bmap.c
View file

@ -1020,9 +1020,7 @@ static int trunc_end(struct gfs2_inode *ip)
if (!ip->i_di.di_size) {
ip->i_height = 0;
ip->i_di.di_goal_meta =
ip->i_di.di_goal_data =
ip->i_no_addr;
ip->i_goal = ip->i_no_addr;
gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
}
ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;

5
fs/gfs2/incore.h
View file

@ -241,8 +241,6 @@ enum {
struct gfs2_dinode_host {
u64 di_size; /* number of bytes in file */
u64 di_blocks; /* number of blocks in file */
u64 di_goal_meta; /* rgrp to alloc from next */
u64 di_goal_data; /* data block goal */
u64 di_generation; /* generation number for NFS */
u32 di_flags; /* GFS2_DIF_... */
/* These only apply to directories */
@ -262,8 +260,7 @@ struct gfs2_inode {
struct gfs2_holder i_iopen_gh;
struct gfs2_holder i_gh; /* for prepare/commit_write only */
struct gfs2_alloc *i_alloc;
u64 i_last_rg_alloc;
u64 i_goal; /* goal block for allocations */
struct rw_semaphore i_rw_mutex;
u8 i_height;
u8 i_depth;

13
fs/gfs2/inode.c
View file

@ -282,8 +282,7 @@ static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf)
ip->i_inode.i_ctime.tv_sec = be64_to_cpu(str->di_ctime);
ip->i_inode.i_ctime.tv_nsec = be32_to_cpu(str->di_ctime_nsec);
di->di_goal_meta = be64_to_cpu(str->di_goal_meta);
di->di_goal_data = be64_to_cpu(str->di_goal_data);
ip->i_goal = be64_to_cpu(str->di_goal_meta);
di->di_generation = be64_to_cpu(str->di_generation);
di->di_flags = be32_to_cpu(str->di_flags);
@ -1404,8 +1403,8 @@ void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf)
str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec);
str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec);
str->di_goal_meta = cpu_to_be64(di->di_goal_meta);
str->di_goal_data = cpu_to_be64(di->di_goal_data);
str->di_goal_meta = cpu_to_be64(ip->i_goal);
str->di_goal_data = cpu_to_be64(ip->i_goal);
str->di_generation = cpu_to_be64(di->di_generation);
str->di_flags = cpu_to_be32(di->di_flags);
@ -1433,10 +1432,8 @@ void gfs2_dinode_print(const struct gfs2_inode *ip)
printk(KERN_INFO " di_size = %llu\n", (unsigned long long)di->di_size);
printk(KERN_INFO " di_blocks = %llu\n",
(unsigned long long)di->di_blocks);
printk(KERN_INFO " di_goal_meta = %llu\n",
(unsigned long long)di->di_goal_meta);
printk(KERN_INFO " di_goal_data = %llu\n",
(unsigned long long)di->di_goal_data);
printk(KERN_INFO " i_goal = %llu\n",
(unsigned long long)ip->i_goal);
printk(KERN_INFO " di_flags = 0x%.8X\n", di->di_flags);
printk(KERN_INFO " i_height = %u\n", ip->i_height);
printk(KERN_INFO " i_depth = %u\n", ip->i_depth);

40
fs/gfs2/rgrp.c
View file

@ -915,24 +915,20 @@ static struct inode *try_rgrp_unlink(struct gfs2_rgrpd *rgd, u64 *last_unlinked)
static struct gfs2_rgrpd *recent_rgrp_first(struct gfs2_sbd *sdp,
u64 rglast)
{
struct gfs2_rgrpd *rgd = NULL;
struct gfs2_rgrpd *rgd;
spin_lock(&sdp->sd_rindex_spin);
if (list_empty(&sdp->sd_rindex_recent_list))
goto out;
if (!rglast)
goto first;
list_for_each_entry(rgd, &sdp->sd_rindex_recent_list, rd_recent) {
if (rgd->rd_addr == rglast)
goto out;
if (rglast) {
list_for_each_entry(rgd, &sdp->sd_rindex_recent_list, rd_recent) {
if (rgrp_contains_block(rgd, rglast))
goto out;
}
}
first:
rgd = list_entry(sdp->sd_rindex_recent_list.next, struct gfs2_rgrpd,
rd_recent);
rgd = NULL;
if (!list_empty(&sdp->sd_rindex_recent_list))
rgd = list_entry(sdp->sd_rindex_recent_list.next,
struct gfs2_rgrpd, rd_recent);
out:
spin_unlock(&sdp->sd_rindex_spin);
return rgd;
@ -1078,7 +1074,7 @@ static struct inode *get_local_rgrp(struct gfs2_inode *ip, u64 *last_unlinked)
/* Try recently successful rgrps */
rgd = recent_rgrp_first(sdp, ip->i_last_rg_alloc);
rgd = recent_rgrp_first(sdp, ip->i_goal);
while (rgd) {
rg_locked = 0;
@ -1162,8 +1158,6 @@ static struct inode *get_local_rgrp(struct gfs2_inode *ip, u64 *last_unlinked)
}
out:
ip->i_last_rg_alloc = rgd->rd_addr;
if (begin) {
recent_rgrp_add(rgd);
rgd = gfs2_rgrpd_get_next(rgd);
@ -1425,8 +1419,8 @@ u64 gfs2_alloc_data(struct gfs2_inode *ip)
u32 goal, blk;
u64 block;
if (rgrp_contains_block(rgd, ip->i_di.di_goal_data))
goal = ip->i_di.di_goal_data - rgd->rd_data0;
if (rgrp_contains_block(rgd, ip->i_goal))
goal = ip->i_goal - rgd->rd_data0;
else
goal = rgd->rd_last_alloc_data;
@ -1435,7 +1429,7 @@ u64 gfs2_alloc_data(struct gfs2_inode *ip)
rgd->rd_last_alloc_data = blk;
block = rgd->rd_data0 + blk;
ip->i_di.di_goal_data = block;
ip->i_goal = block;
gfs2_assert_withdraw(sdp, rgd->rd_rg.rg_free);
rgd->rd_rg.rg_free--;
@ -1470,8 +1464,8 @@ u64 gfs2_alloc_meta(struct gfs2_inode *ip)
u32 goal, blk;
u64 block;
if (rgrp_contains_block(rgd, ip->i_di.di_goal_meta))
goal = ip->i_di.di_goal_meta - rgd->rd_data0;
if (rgrp_contains_block(rgd, ip->i_goal))
goal = ip->i_goal - rgd->rd_data0;
else
goal = rgd->rd_last_alloc_meta;
@ -1480,7 +1474,7 @@ u64 gfs2_alloc_meta(struct gfs2_inode *ip)
rgd->rd_last_alloc_meta = blk;
block = rgd->rd_data0 + blk;
ip->i_di.di_goal_meta = block;
ip->i_goal = block;
gfs2_assert_withdraw(sdp, rgd->rd_rg.rg_free);
rgd->rd_rg.rg_free--;