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Diffstat (limited to 'tmpfs')
-rw-r--r--tmpfs/dir.c86
-rw-r--r--tmpfs/node.c22
2 files changed, 71 insertions, 37 deletions
diff --git a/tmpfs/dir.c b/tmpfs/dir.c
index 8c661a1b..e8776e39 100644
--- a/tmpfs/dir.c
+++ b/tmpfs/dir.c
@@ -62,7 +62,8 @@ diskfs_get_directs (struct node *dp, int entry, int n,
>= offsetof (struct dirent, d_name));
if (bufsiz == 0)
- bufsiz = dp->dn_stat.st_size + 2 * offsetof (struct dirent, d_name[4]);
+ bufsiz = dp->dn_stat.st_size
+ + 2 * ((offsetof (struct dirent, d_name[3]) + 7) & ~7);
if (bufsiz > *datacnt)
{
*data = mmap (0, bufsiz, PROT_READ|PROT_WRITE, MAP_ANON, 0, 0);
@@ -108,19 +109,26 @@ diskfs_get_directs (struct node *dp, int entry, int n,
for (d = dp->dn->u.dir.entries; i < entry && d != 0; d = d->next)
++i;
+ if (i < entry)
+ {
+ assert (d == 0);
+ *datacnt = 0;
+ *amt = 0;
+ return 0;
+ }
+
/* Now fill in the buffer with real entries. */
- for (; d != 0; d = d->next)
+ for (; d != 0; d = d->next, i++)
{
- if ((char *) entp - *data >= bufsiz || (n >= 0 && ++i > n))
+ size_t rlen = (offsetof (struct dirent, d_name[1]) + d->namelen + 7) & ~7;
+ if (rlen + (char *) entp - *data > bufsiz || (n >= 0 && i > n))
break;
entp->d_fileno = (ino_t) d->dn;
entp->d_type = DT_UNKNOWN;
entp->d_namlen = d->namelen;
memcpy (entp->d_name, d->name, d->namelen + 1);
- entp->d_reclen = ((&entp->d_name[d->namelen + 1] - (char *) entp + 7)
- & ~7);
- entp = (void *) entp + entp->d_reclen;
- ++i;
+ entp->d_reclen = rlen;
+ entp = (void *) entp + rlen;
}
*datacnt = (char *) entp - *data;
@@ -158,6 +166,9 @@ diskfs_lookup_hard (struct node *dp,
const size_t namelen = strlen (name);
struct tmpfs_dirent *d, **prevp;
+ if (type == REMOVE || type == RENAME)
+ assert (np);
+
if (namelen == 1 && name[0] == '.')
{
if (np != 0)
@@ -170,40 +181,54 @@ diskfs_lookup_hard (struct node *dp,
if (namelen == 2 && name[0] == '.' && name[1] == '.')
{
struct disknode *dddn = dp->dn->u.dir.dotdot;
- struct node *ddnp = 0;
error_t err;
assert (np != 0);
if (dddn == 0) /* root directory */
return EAGAIN;
- err = diskfs_cached_lookup ((int) dddn, &ddnp);
- switch (type)
- {
- case LOOKUP|SPEC_DOTDOT:
- diskfs_nput (dp);
- default:
- if (!err)
- {
- diskfs_nref (ddnp);
- mutex_lock (&ddnp->lock);
- }
- case REMOVE|SPEC_DOTDOT:
- case RENAME|SPEC_DOTDOT:
- *np = ddnp;
+ if (type == (REMOVE|SPEC_DOTDOT) || type == (RENAME|SPEC_DOTDOT))
+ {
+ *np = *dddn->hprevp;
+ assert (*np);
+ assert ((*np)->dn == dddn);
+ assert (*dddn->hprevp == *np);
+ return 0;
+ }
+ else
+ {
+ mutex_unlock (&dp->lock);
+ err = diskfs_cached_lookup ((int) dddn, np);
+
+ if (type == (LOOKUP|SPEC_DOTDOT))
+ diskfs_nrele (dp);
+ else
+ mutex_lock (&dp->lock);
+
+ if (err)
+ *np = 0;
+
+ return err;
}
- return err;
}
for (d = *(prevp = &dp->dn->u.dir.entries); d != 0;
d = *(prevp = &d->next))
if (d->namelen == namelen && !memcmp (d->name, name, namelen))
{
- ds->prevp = prevp;
- return diskfs_cached_lookup ((ino_t) d->dn, np);
+ if (ds)
+ ds->prevp = prevp;
+
+ if (np)
+ return diskfs_cached_lookup ((ino_t) d->dn, np);
+ else
+ return 0;
}
- ds->prevp = prevp;
+ if (ds)
+ ds->prevp = prevp;
+ if (np)
+ *np = 0;
return ENOENT;
}
@@ -214,10 +239,12 @@ diskfs_direnter_hard (struct node *dp, const char *name,
struct protid *cred)
{
const size_t namelen = strlen (name);
- const size_t entsize = offsetof (struct tmpfs_dirent, name) + namelen + 1;
+ const size_t entsize
+ = (offsetof (struct dirent, d_name[1]) + namelen + 7) & ~7;
struct tmpfs_dirent *new;
- if (round_page (tmpfs_space_used + entsize) > tmpfs_page_limit)
+ if (round_page (tmpfs_space_used + entsize) / vm_page_size
+ > tmpfs_page_limit)
return ENOSPC;
new = malloc (entsize);
@@ -251,7 +278,8 @@ error_t
diskfs_dirremove_hard (struct node *dp, struct dirstat *ds)
{
struct tmpfs_dirent *d = *ds->prevp;
- const size_t entsize = &d->name[d->namelen + 1] - (char *) d;
+ const size_t entsize
+ = (offsetof (struct dirent, d_name[1]) + d->namelen + 7) & ~7;
*ds->prevp = d->next;
diff --git a/tmpfs/node.c b/tmpfs/node.c
index 92768ee8..cfaa2d90 100644
--- a/tmpfs/node.c
+++ b/tmpfs/node.c
@@ -74,10 +74,8 @@ diskfs_free_node (struct node *np, mode_t mode)
free (np->dn);
np->dn = 0;
- spin_lock (&diskfs_node_refcnt_lock);
--num_files;
tmpfs_space_used -= sizeof *np->dn;
- spin_unlock (&diskfs_node_refcnt_lock);
}
void
@@ -150,31 +148,36 @@ recompute_blocks (struct node *np)
st->st_blocks = (st->st_blocks + 511) / 512;
}
+/* Fetch inode INUM, set *NPP to the node structure;
+ gain one user reference and lock the node. */
error_t
diskfs_cached_lookup (int inum, struct node **npp)
{
struct disknode *dn = (void *) inum;
struct node *np;
+ assert (npp);
+
if (dn->hprevp != 0) /* There is already a node. */
{
np = *dn->hprevp;
assert (np->dn == dn);
assert (*dn->hprevp == np);
- spin_lock (&diskfs_node_refcnt_lock);
- np->references++;
- spin_unlock (&diskfs_node_refcnt_lock);
+
+ diskfs_nref (np);
}
else
+ /* Create the new node. */
{
struct stat *st;
- /* Create the new node. */
np = diskfs_make_node (dn);
np->cache_id = (ino_t) dn;
spin_lock (&diskfs_node_refcnt_lock);
dn->hnext = all_nodes;
+ if (dn->hnext)
+ dn->hnext->dn->hprevp = &dn->hnext;
dn->hprevp = &all_nodes;
all_nodes = np;
spin_unlock (&diskfs_node_refcnt_lock);
@@ -303,6 +306,7 @@ diskfs_set_translator (struct node *np,
{
free (np->dn->trans);
new = 0;
+ np->dn_stat.st_mode &= ~S_IPTRANS;
}
else
{
@@ -310,6 +314,7 @@ diskfs_set_translator (struct node *np,
if (new == 0)
return ENOSPC;
memcpy (new, name, namelen);
+ np->dn_stat.st_mode |= S_IPTRANS;
}
adjust_used (namelen - np->dn->translen);
np->dn->trans = new;
@@ -400,6 +405,7 @@ diskfs_truncate (struct node *np, off_t size)
adjust_used (size - np->allocsize);
np->dn_stat.st_blocks += (size - np->allocsize) / 512;
+ np->dn_stat.st_size = size;
np->allocsize = size;
return 0;
@@ -412,11 +418,11 @@ diskfs_truncate (struct node *np, off_t size)
error_t
diskfs_grow (struct node *np, off_t size, struct protid *cred)
{
+ assert (np->dn->type == DT_REG);
+
if (np->allocsize >= size)
return 0;
- assert (np->dn->type == DT_REG);
-
size = round_page (size);
if (round_page (tmpfs_space_used + size) / vm_page_size > tmpfs_page_limit)
return ENOSPC;
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-16 08:56:57 +0000