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Diffstat (limited to 'fs/gfs2/dir.c')
-rw-r--r--fs/gfs2/dir.c64
1 files changed, 58 insertions, 6 deletions
diff --git a/fs/gfs2/dir.c b/fs/gfs2/dir.c
index 8ccad2467cb6..c35573abd371 100644
--- a/fs/gfs2/dir.c
+++ b/fs/gfs2/dir.c
@@ -76,6 +76,8 @@
#define IS_LEAF 1 /* Hashed (leaf) directory */
#define IS_DINODE 2 /* Linear (stuffed dinode block) directory */
+#define MAX_RA_BLOCKS 32 /* max read-ahead blocks */
+
#define gfs2_disk_hash2offset(h) (((u64)(h)) >> 1)
#define gfs2_dir_offset2hash(p) ((u32)(((u64)(p)) << 1))
@@ -821,7 +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_blocks(ip, &bn, &n, 0, NULL);
if (error)
return NULL;
bh = gfs2_meta_new(ip->i_gl, bn);
@@ -1376,6 +1378,52 @@ out:
return error;
}
+/**
+ * gfs2_dir_readahead - Issue read-ahead requests for leaf blocks.
+ *
+ * Note: we can't calculate each index like dir_e_read can because we don't
+ * have the leaf, and therefore we don't have the depth, and therefore we
+ * don't have the length. So we have to just read enough ahead to make up
+ * for the loss of information.
+ */
+static void gfs2_dir_readahead(struct inode *inode, unsigned hsize, u32 index,
+ struct file_ra_state *f_ra)
+{
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_glock *gl = ip->i_gl;
+ struct buffer_head *bh;
+ u64 blocknr = 0, last;
+ unsigned count;
+
+ /* First check if we've already read-ahead for the whole range. */
+ if (index + MAX_RA_BLOCKS < f_ra->start)
+ return;
+
+ f_ra->start = max((pgoff_t)index, f_ra->start);
+ for (count = 0; count < MAX_RA_BLOCKS; count++) {
+ if (f_ra->start >= hsize) /* if exceeded the hash table */
+ break;
+
+ last = blocknr;
+ blocknr = be64_to_cpu(ip->i_hash_cache[f_ra->start]);
+ f_ra->start++;
+ if (blocknr == last)
+ continue;
+
+ bh = gfs2_getbuf(gl, blocknr, 1);
+ if (trylock_buffer(bh)) {
+ if (buffer_uptodate(bh)) {
+ unlock_buffer(bh);
+ brelse(bh);
+ continue;
+ }
+ bh->b_end_io = end_buffer_read_sync;
+ submit_bh(READA | REQ_META, bh);
+ continue;
+ }
+ brelse(bh);
+ }
+}
/**
* dir_e_read - Reads the entries from a directory into a filldir buffer
@@ -1388,7 +1436,7 @@ out:
*/
static int dir_e_read(struct inode *inode, u64 *offset, void *opaque,
- filldir_t filldir)
+ filldir_t filldir, struct file_ra_state *f_ra)
{
struct gfs2_inode *dip = GFS2_I(inode);
u32 hsize, len = 0;
@@ -1402,10 +1450,14 @@ static int dir_e_read(struct inode *inode, u64 *offset, void *opaque,
hash = gfs2_dir_offset2hash(*offset);
index = hash >> (32 - dip->i_depth);
+ if (dip->i_hash_cache == NULL)
+ f_ra->start = 0;
lp = gfs2_dir_get_hash_table(dip);
if (IS_ERR(lp))
return PTR_ERR(lp);
+ gfs2_dir_readahead(inode, hsize, index, f_ra);
+
while (index < hsize) {
error = gfs2_dir_read_leaf(inode, offset, opaque, filldir,
&copied, &depth,
@@ -1423,7 +1475,7 @@ static int dir_e_read(struct inode *inode, u64 *offset, void *opaque,
}
int gfs2_dir_read(struct inode *inode, u64 *offset, void *opaque,
- filldir_t filldir)
+ filldir_t filldir, struct file_ra_state *f_ra)
{
struct gfs2_inode *dip = GFS2_I(inode);
struct gfs2_sbd *sdp = GFS2_SB(inode);
@@ -1437,7 +1489,7 @@ int gfs2_dir_read(struct inode *inode, u64 *offset, void *opaque,
return 0;
if (dip->i_diskflags & GFS2_DIF_EXHASH)
- return dir_e_read(inode, offset, opaque, filldir);
+ return dir_e_read(inode, offset, opaque, filldir, f_ra);
if (!gfs2_is_stuffed(dip)) {
gfs2_consist_inode(dip);
@@ -1798,7 +1850,7 @@ static int leaf_dealloc(struct gfs2_inode *dip, u32 index, u32 len,
if (!ht)
return -ENOMEM;
- if (!gfs2_alloc_get(dip)) {
+ if (!gfs2_qadata_get(dip)) {
error = -ENOMEM;
goto out;
}
@@ -1887,7 +1939,7 @@ out_rlist:
gfs2_rlist_free(&rlist);
gfs2_quota_unhold(dip);
out_put:
- gfs2_alloc_put(dip);
+ gfs2_qadata_put(dip);
out:
kfree(ht);
return error;