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[GFS2] Make sentinel dirents compatible with gfs1 

When deleting directory entries, we set the inum.no_addr to zero
in a dirent when its the first dirent in a block and thus cannot
be merged into the previous dirent as is the usual case. In gfs1,
inum.no_formal_ino was used instead.

This patch changes gfs2 to set both inum.no_addr and inum.no_formal_ino
to zero. It also changes the test from just looking at inum.no_addr to
look at both inum.no_addr and inum.no_formal_ino and a sentinel is
now considered to be a dirent in which _either_ (or both) of them
is set to zero.

This resolves Red Hat bugzillas: #215809, #211465

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Steven Whitehouse 2006-11-17 12:27:44 -05:00
parent dcd2479959
commit 5e7d65cd9d
1 changed files with 16 additions and 10 deletions
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26
fs/gfs2/dir.c
View File

@ -340,10 +340,15 @@ fail:
return (copied) ? copied : error;
}
static inline int gfs2_dirent_sentinel(const struct gfs2_dirent *dent)
{
return dent->de_inum.no_addr == 0 || dent->de_inum.no_formal_ino == 0;
}
static inline int __gfs2_dirent_find(const struct gfs2_dirent *dent,
const struct qstr *name, int ret)
{
if (dent->de_inum.no_addr != 0 &&
if (!gfs2_dirent_sentinel(dent) &&
be32_to_cpu(dent->de_hash) == name->hash &&
be16_to_cpu(dent->de_name_len) == name->len &&
memcmp(dent+1, name->name, name->len) == 0)
@ -388,7 +393,7 @@ static int gfs2_dirent_find_space(const struct gfs2_dirent *dent,
unsigned actual = GFS2_DIRENT_SIZE(be16_to_cpu(dent->de_name_len));
unsigned totlen = be16_to_cpu(dent->de_rec_len);
if (!dent->de_inum.no_addr)
if (gfs2_dirent_sentinel(dent))
actual = GFS2_DIRENT_SIZE(0);
if (totlen - actual >= required)
return 1;
@ -405,7 +410,7 @@ static int gfs2_dirent_gather(const struct gfs2_dirent *dent,
void *opaque)
{
struct dirent_gather *g = opaque;
if (dent->de_inum.no_addr) {
if (!gfs2_dirent_sentinel(dent)) {
g->pdent[g->offset++] = dent;
}
return 0;
@ -433,10 +438,10 @@ static int gfs2_check_dirent(struct gfs2_dirent *dent, unsigned int offset,
if (unlikely(offset + size > len))
goto error;
msg = "zero inode number";
if (unlikely(!first && !dent->de_inum.no_addr))
if (unlikely(!first && gfs2_dirent_sentinel(dent)))
goto error;
msg = "name length is greater than space in dirent";
if (dent->de_inum.no_addr &&
if (!gfs2_dirent_sentinel(dent) &&
unlikely(sizeof(struct gfs2_dirent)+be16_to_cpu(dent->de_name_len) >
size))
goto error;
@ -598,7 +603,7 @@ static int dirent_next(struct gfs2_inode *dip, struct buffer_head *bh,
return ret;
/* Only the first dent could ever have de_inum.no_addr == 0 */
if (!tmp->de_inum.no_addr) {
if (gfs2_dirent_sentinel(tmp)) {
gfs2_consist_inode(dip);
return -EIO;
}
@ -621,7 +626,7 @@ static void dirent_del(struct gfs2_inode *dip, struct buffer_head *bh,
{
u16 cur_rec_len, prev_rec_len;
if (!cur->de_inum.no_addr) {
if (gfs2_dirent_sentinel(cur)) {
gfs2_consist_inode(dip);
return;
}
@ -633,7 +638,8 @@ static void dirent_del(struct gfs2_inode *dip, struct buffer_head *bh,
out the inode number and return. */
if (!prev) {
cur->de_inum.no_addr = 0; /* No endianess worries */
cur->de_inum.no_addr = 0;
cur->de_inum.no_formal_ino = 0;
return;
}
@ -664,7 +670,7 @@ static struct gfs2_dirent *gfs2_init_dirent(struct inode *inode,
struct gfs2_dirent *ndent;
unsigned offset = 0, totlen;
if (dent->de_inum.no_addr)
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);
@ -1002,7 +1008,7 @@ static int dir_split_leaf(struct inode *inode, const struct qstr *name)
if (dirent_next(dip, obh, &next))
next = NULL;
if (dent->de_inum.no_addr &&
if (!gfs2_dirent_sentinel(dent) &&
be32_to_cpu(dent->de_hash) < divider) {
struct qstr str;
str.name = (char*)(dent+1);