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gfs2: Remove sdp->sd_jheightsize 

GFS2 keeps two arrarys in the superblock that define the maximum size of
an inode depending on the inode's height: sdp->sd_heightsize defines the
heights in units of sb->s_blocksize; sdp->sd_jheightsize defines them in
units of sb->s_blocksize - sizeof(struct gfs2_meta_header).  These
arrays are used to determine when additional layers of indirect blocks
are needed.  The second array is used for directories which have an
additional gfs2_meta_header at the beginning of each block.

Distinguishing between these two cases makes no sense: the height
required for representing N blocks will come out the same no matter if
the calculation is done in gross (sb->s_blocksize) or net
(sb->s_blocksize - sizeof(struct gfs2_meta_header)) units.

Stuffed directories don't have an additional gfs2_meta_header, but the
stuffed case is handled separately for both files and directories,
anyway.

Remove the unncessary sdp->sd_jheightsize array.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
This commit is contained in:
Andreas Gruenbacher 2018-04-16 09:25:21 -07:00 committed by Bob Peterson
parent 16e205cf42
commit 9a38662ba4
3 changed files with 1 additions and 34 deletions
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14
fs/gfs2/bmap.c
View File

@ -700,8 +700,6 @@ int gfs2_iomap_begin(struct inode *inode, loff_t pos, loff_t length,
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_sbd *sdp = GFS2_SB(inode);
struct metapath mp = { .mp_aheight = 1, };
unsigned int factor = sdp->sd_sb.sb_bsize;
const u64 *arr = sdp->sd_heightsize;
__be64 *ptr;
sector_t lblock;
sector_t lend;
@ -737,22 +735,12 @@ int gfs2_iomap_begin(struct inode *inode, loff_t pos, loff_t length,
iomap->flags = IOMAP_F_MERGED;
bmap_lock(ip, flags & IOMAP_WRITE);
/*
* Directory data blocks have a struct gfs2_meta_header header, so the
* remaining size is smaller than the filesystem block size. Logical
* block numbers for directories are in units of this remaining size!
*/
if (gfs2_is_dir(ip)) {
factor = sdp->sd_jbsize;
arr = sdp->sd_jheightsize;
}
ret = gfs2_meta_inode_buffer(ip, &mp.mp_bh[0]);
if (ret)
goto out_release;
height = ip->i_height;
while ((lblock + 1) * factor > arr[height])
while ((lblock + 1) * sdp->sd_sb.sb_bsize > sdp->sd_heightsize[height])
height++;
find_metapath(sdp, lblock, &mp, height);
if (height > ip->i_height || gfs2_is_stuffed(ip))

2
fs/gfs2/incore.h
View File

@ -696,8 +696,6 @@ struct gfs2_sbd {
u32 sd_max_dirres; /* Max blocks needed to add a directory entry */
u32 sd_max_height; /* Max height of a file's metadata tree */
u64 sd_heightsize[GFS2_MAX_META_HEIGHT + 1];
u32 sd_max_jheight; /* Max height of journaled file's meta tree */
u64 sd_jheightsize[GFS2_MAX_META_HEIGHT + 1];
u32 sd_max_dents_per_leaf; /* Max number of dirents in a leaf block */
struct gfs2_args sd_args; /* Mount arguments */

19
fs/gfs2/ops_fstype.c
View File

@ -335,25 +335,6 @@ static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
sdp->sd_heightsize[x] = ~0;
gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize -
sizeof(struct gfs2_dinode);
sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs;
for (x = 2;; x++) {
u64 space, d;
u32 m;
space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs;
d = space;
m = do_div(d, sdp->sd_inptrs);
if (d != sdp->sd_jheightsize[x - 1] || m)
break;
sdp->sd_jheightsize[x] = space;
}
sdp->sd_max_jheight = x;
sdp->sd_jheightsize[x] = ~0;
gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT);
sdp->sd_max_dents_per_leaf = (sdp->sd_sb.sb_bsize -
sizeof(struct gfs2_leaf)) /
GFS2_MIN_DIRENT_SIZE;