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fs/adfs: dir: add more efficient iterate() per-format method

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Rather than using setpos + getnext to iterate through the directory
entries, pass iterate() down to the dir format code to populate the
dirents.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Russell King
2019-12-09 11:10:16 +00:00
committed by Al Viro
parent cdc46e99e1
commit 4287e4deb1
4 changed files with 42 additions and 14 deletions
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18
fs/adfs/dir_f.c
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@@ -302,6 +302,23 @@ adfs_f_getnext(struct adfs_dir *dir, struct object_info *obj)
return ret;
}
static int adfs_f_iterate(struct adfs_dir *dir, struct dir_context *ctx)
{
struct object_info obj;
int pos = 5 + (ctx->pos - 2) * 26;
while (ctx->pos < 2 + ADFS_NUM_DIR_ENTRIES) {
if (__adfs_dir_get(dir, pos, &obj))
break;
if (!dir_emit(ctx, obj.name, obj.name_len,
obj.indaddr, DT_UNKNOWN))
break;
pos += 26;
ctx->pos++;
}
return 0;
}
static int
adfs_f_update(struct adfs_dir *dir, struct object_info *obj)
{
@@ -359,6 +376,7 @@ bad_dir:
const struct adfs_dir_ops adfs_f_dir_ops = {
.read = adfs_f_read,
.iterate = adfs_f_iterate,
.setpos = adfs_f_setpos,
.getnext = adfs_f_getnext,
.update = adfs_f_update,