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-rw-r--r--fs/gfs2/dir.c69
1 files changed, 53 insertions, 16 deletions
diff --git a/fs/gfs2/dir.c b/fs/gfs2/dir.c
index c2486598fb87..4ee008c6d64b 100644
--- a/fs/gfs2/dir.c
+++ b/fs/gfs2/dir.c
@@ -443,6 +443,27 @@ static int gfs2_dirent_last(const struct gfs2_dirent *dent,
return 0;
}
+/* Look for the dirent that contains the offset specified in data. Once we
+ * find that dirent, there must be space available there for the new dirent */
+static int gfs2_dirent_find_offset(const struct gfs2_dirent *dent,
+ const struct qstr *name,
+ void *ptr)
+{
+ unsigned required = GFS2_DIRENT_SIZE(name->len);
+ unsigned actual = GFS2_DIRENT_SIZE(be16_to_cpu(dent->de_name_len));
+ unsigned totlen = be16_to_cpu(dent->de_rec_len);
+
+ if (ptr < (void *)dent || ptr >= (void *)dent + totlen)
+ return 0;
+ if (gfs2_dirent_sentinel(dent))
+ actual = 0;
+ if (ptr < (void *)dent + actual)
+ return -1;
+ if ((void *)dent + totlen >= ptr + required)
+ return 1;
+ return -1;
+}
+
static int gfs2_dirent_find_space(const struct gfs2_dirent *dent,
const struct qstr *name,
void *opaque)
@@ -682,6 +703,27 @@ static void dirent_del(struct gfs2_inode *dip, struct buffer_head *bh,
prev->de_rec_len = cpu_to_be16(prev_rec_len);
}
+
+static struct gfs2_dirent *do_init_dirent(struct inode *inode,
+ struct gfs2_dirent *dent,
+ const struct qstr *name,
+ struct buffer_head *bh,
+ unsigned offset)
+{
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_dirent *ndent;
+ unsigned totlen;
+
+ totlen = be16_to_cpu(dent->de_rec_len);
+ BUG_ON(offset + name->len > totlen);
+ gfs2_trans_add_meta(ip->i_gl, bh);
+ ndent = (struct gfs2_dirent *)((char *)dent + offset);
+ dent->de_rec_len = cpu_to_be16(offset);
+ gfs2_qstr2dirent(name, totlen - offset, ndent);
+ return ndent;
+}
+
+
/*
* Takes a dent from which to grab space as an argument. Returns the
* newly created dent.
@@ -691,31 +733,25 @@ static struct gfs2_dirent *gfs2_init_dirent(struct inode *inode,
const struct qstr *name,
struct buffer_head *bh)
{
- struct gfs2_inode *ip = GFS2_I(inode);
- struct gfs2_dirent *ndent;
- unsigned offset = 0, totlen;
+ unsigned offset = 0;
if (!gfs2_dirent_sentinel(dent))
offset = GFS2_DIRENT_SIZE(be16_to_cpu(dent->de_name_len));
- totlen = be16_to_cpu(dent->de_rec_len);
- BUG_ON(offset + name->len > totlen);
- gfs2_trans_add_meta(ip->i_gl, bh);
- ndent = (struct gfs2_dirent *)((char *)dent + offset);
- dent->de_rec_len = cpu_to_be16(offset);
- gfs2_qstr2dirent(name, totlen - offset, ndent);
- return ndent;
+ return do_init_dirent(inode, dent, name, bh, offset);
}
-static struct gfs2_dirent *gfs2_dirent_alloc(struct inode *inode,
- struct buffer_head *bh,
- const struct qstr *name)
+static struct gfs2_dirent *gfs2_dirent_split_alloc(struct inode *inode,
+ struct buffer_head *bh,
+ const struct qstr *name,
+ void *ptr)
{
struct gfs2_dirent *dent;
dent = gfs2_dirent_scan(inode, bh->b_data, bh->b_size,
- gfs2_dirent_find_space, name, NULL);
+ gfs2_dirent_find_offset, name, ptr);
if (!dent || IS_ERR(dent))
return dent;
- return gfs2_init_dirent(inode, dent, name, bh);
+ return do_init_dirent(inode, dent, name, bh,
+ (unsigned)(ptr - (void *)dent));
}
static int get_leaf(struct gfs2_inode *dip, u64 leaf_no,
@@ -1051,10 +1087,11 @@ static int dir_split_leaf(struct inode *inode, const struct qstr *name)
if (!gfs2_dirent_sentinel(dent) &&
be32_to_cpu(dent->de_hash) < divider) {
struct qstr str;
+ void *ptr = ((char *)dent - obh->b_data) + nbh->b_data;
str.name = (char*)(dent+1);
str.len = be16_to_cpu(dent->de_name_len);
str.hash = be32_to_cpu(dent->de_hash);
- new = gfs2_dirent_alloc(inode, nbh, &str);
+ new = gfs2_dirent_split_alloc(inode, nbh, &str, ptr);
if (IS_ERR(new)) {
error = PTR_ERR(new);
break;