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authorRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2011-05-05 01:23:58 +0900
committerRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2011-05-10 22:21:46 +0900
commit4e33f9eab07e985282fece4121066c2db1d332ed (patch)
tree08161cabc013f0543d65d9c9ed63689f9f68803d /fs/nilfs2/the_nilfs.c
parent78eb64c2479e0f408b725c3c8e1cdf557857af48 (diff)
nilfs2: implement resize ioctl
This adds resize ioctl which makes online resize possible. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Diffstat (limited to 'fs/nilfs2/the_nilfs.c')
-rw-r--r--fs/nilfs2/the_nilfs.c24
1 files changed, 19 insertions, 5 deletions
diff --git a/fs/nilfs2/the_nilfs.c b/fs/nilfs2/the_nilfs.c
index d2acd1a651f3..d32714094375 100644
--- a/fs/nilfs2/the_nilfs.c
+++ b/fs/nilfs2/the_nilfs.c
@@ -363,6 +363,24 @@ static unsigned long long nilfs_max_size(unsigned int blkbits)
return res;
}
+/**
+ * nilfs_nrsvsegs - calculate the number of reserved segments
+ * @nilfs: nilfs object
+ * @nsegs: total number of segments
+ */
+unsigned long nilfs_nrsvsegs(struct the_nilfs *nilfs, unsigned long nsegs)
+{
+ return max_t(unsigned long, NILFS_MIN_NRSVSEGS,
+ DIV_ROUND_UP(nsegs * nilfs->ns_r_segments_percentage,
+ 100));
+}
+
+void nilfs_set_nsegments(struct the_nilfs *nilfs, unsigned long nsegs)
+{
+ nilfs->ns_nsegments = nsegs;
+ nilfs->ns_nrsvsegs = nilfs_nrsvsegs(nilfs, nsegs);
+}
+
static int nilfs_store_disk_layout(struct the_nilfs *nilfs,
struct nilfs_super_block *sbp)
{
@@ -389,13 +407,9 @@ static int nilfs_store_disk_layout(struct the_nilfs *nilfs,
}
nilfs->ns_first_data_block = le64_to_cpu(sbp->s_first_data_block);
- nilfs->ns_nsegments = le64_to_cpu(sbp->s_nsegments);
nilfs->ns_r_segments_percentage =
le32_to_cpu(sbp->s_r_segments_percentage);
- nilfs->ns_nrsvsegs =
- max_t(unsigned long, NILFS_MIN_NRSVSEGS,
- DIV_ROUND_UP(nilfs->ns_nsegments *
- nilfs->ns_r_segments_percentage, 100));
+ nilfs_set_nsegments(nilfs, le64_to_cpu(sbp->s_nsegments));
nilfs->ns_crc_seed = le32_to_cpu(sbp->s_crc_seed);
return 0;
}