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-rw-r--r--fs/isofs/rock.c237
1 files changed, 130 insertions, 107 deletions
diff --git a/fs/isofs/rock.c b/fs/isofs/rock.c
index aafe356ec1b7..efefbcce4ce9 100644
--- a/fs/isofs/rock.c
+++ b/fs/isofs/rock.c
@@ -22,6 +22,16 @@
#define SIG(A,B) ((A) | ((B) << 8)) /* isonum_721() */
+struct rock_state {
+ void *buffer;
+ unsigned char *chr;
+ int len;
+ int cont_size;
+ int cont_extent;
+ int cont_offset;
+ struct inode *inode;
+};
+
/*
* This is a way of ensuring that we have something in the system
* use fields that is compatible with Rock Ridge. Return zero on success.
@@ -38,82 +48,96 @@ static int check_sp(struct rock_ridge *rr, struct inode *inode)
}
static void setup_rock_ridge(struct iso_directory_record *de,
- struct inode *inode, unsigned char **chr, int *len)
+ struct inode *inode, struct rock_state *rs)
{
- *len = sizeof(struct iso_directory_record) + de->name_len[0];
- if (*len & 1)
- (*len)++;
- *chr = (unsigned char *)de + *len;
- *len = *((unsigned char *)de) - *len;
- if (*len < 0)
- *len = 0;
+ rs->len = sizeof(struct iso_directory_record) + de->name_len[0];
+ if (rs->len & 1)
+ (rs->len)++;
+ rs->chr = (unsigned char *)de + rs->len;
+ rs->len = *((unsigned char *)de) - rs->len;
+ if (rs->len < 0)
+ rs->len = 0;
if (ISOFS_SB(inode->i_sb)->s_rock_offset != -1) {
- *len -= ISOFS_SB(inode->i_sb)->s_rock_offset;
- *chr += ISOFS_SB(inode->i_sb)->s_rock_offset;
- if (*len < 0)
- *len = 0;
+ rs->len -= ISOFS_SB(inode->i_sb)->s_rock_offset;
+ rs->chr += ISOFS_SB(inode->i_sb)->s_rock_offset;
+ if (rs->len < 0)
+ rs->len = 0;
}
}
-#define MAYBE_CONTINUE(LABEL,DEV) \
- {if (buffer) { kfree(buffer); buffer = NULL; } \
- if (cont_extent){ \
- int block, offset, offset1; \
- struct buffer_head * pbh; \
- buffer = kmalloc(cont_size,GFP_KERNEL); \
- if (!buffer) goto out; \
- block = cont_extent; \
- offset = cont_offset; \
- offset1 = 0; \
- pbh = sb_bread(DEV->i_sb, block); \
- if(pbh){ \
- if (offset > pbh->b_size || offset + cont_size > pbh->b_size){ \
- brelse(pbh); \
- goto out; \
- } \
- memcpy(buffer + offset1, pbh->b_data + offset, cont_size - offset1); \
- brelse(pbh); \
- chr = (unsigned char *) buffer; \
- len = cont_size; \
- cont_extent = 0; \
- cont_size = 0; \
- cont_offset = 0; \
- goto LABEL; \
- } \
- printk("Unable to read rock-ridge attributes\n"); \
- }}
+static void init_rock_state(struct rock_state *rs, struct inode *inode)
+{
+ memset(rs, 0, sizeof(*rs));
+ rs->inode = inode;
+}
+
+/*
+ * Returns 0 if the caller should continue scanning, 1 if the scan must end
+ * and -ve on error.
+ */
+static int rock_continue(struct rock_state *rs)
+{
+ int ret = 1;
+
+ kfree(rs->buffer);
+ rs->buffer = NULL;
+ if (rs->cont_extent) {
+ struct buffer_head *bh;
+
+ rs->buffer = kmalloc(rs->cont_size, GFP_KERNEL);
+ if (!rs->buffer) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ ret = -EIO;
+ bh = sb_bread(rs->inode->i_sb, rs->cont_extent);
+ if (bh) {
+ memcpy(rs->buffer, bh->b_data + rs->cont_offset,
+ rs->cont_size);
+ put_bh(bh);
+ rs->chr = rs->buffer;
+ rs->len = rs->cont_size;
+ rs->cont_extent = 0;
+ rs->cont_size = 0;
+ rs->cont_offset = 0;
+ return 0;
+ }
+ printk("Unable to read rock-ridge attributes\n");
+ }
+out:
+ kfree(rs->buffer);
+ rs->buffer = NULL;
+ return ret;
+}
/* return length of name field; 0: not found, -1: to be ignored */
int get_rock_ridge_filename(struct iso_directory_record *de,
char *retname, struct inode *inode)
{
- int len;
- unsigned char *chr;
- int cont_extent = 0;
- int cont_offset = 0;
- int cont_size = 0;
- void *buffer = NULL;
+ struct rock_state rs;
struct rock_ridge *rr;
int sig;
int retnamlen = 0;
int truncate = 0;
+ int ret = 0;
if (!ISOFS_SB(inode->i_sb)->s_rock)
return 0;
*retname = 0;
- setup_rock_ridge(de, inode, &chr, &len);
+ init_rock_state(&rs, inode);
+ setup_rock_ridge(de, inode, &rs);
repeat:
- while (len > 2) { /* There may be one byte for padding somewhere */
- rr = (struct rock_ridge *)chr;
+ while (rs.len > 2) { /* There may be one byte for padding somewhere */
+ rr = (struct rock_ridge *)rs.chr;
if (rr->len < 3)
goto out; /* Something got screwed up here */
- sig = isonum_721(chr);
- chr += rr->len;
- len -= rr->len;
- if (len < 0)
+ sig = isonum_721(rs.chr);
+ rs.chr += rr->len;
+ rs.len -= rr->len;
+ if (rs.len < 0)
goto out; /* corrupted isofs */
switch (sig) {
@@ -126,9 +150,9 @@ repeat:
goto out;
break;
case SIG('C', 'E'):
- cont_extent = isonum_733(rr->u.CE.extent);
- cont_offset = isonum_733(rr->u.CE.offset);
- cont_size = isonum_733(rr->u.CE.size);
+ rs.cont_extent = isonum_733(rr->u.CE.extent);
+ rs.cont_offset = isonum_733(rr->u.CE.offset);
+ rs.cont_size = isonum_733(rr->u.CE.size);
break;
case SIG('N', 'M'):
if (truncate)
@@ -158,58 +182,55 @@ repeat:
retnamlen += rr->len - 5;
break;
case SIG('R', 'E'):
- if (buffer)
- kfree(buffer);
+ kfree(rs.buffer);
return -1;
default:
break;
}
}
- MAYBE_CONTINUE(repeat, inode);
- kfree(buffer);
- return retnamlen; /* If 0, this file did not have a NM field */
+ ret = rock_continue(&rs);
+ if (ret == 0)
+ goto repeat;
+ if (ret == 1)
+ return retnamlen; /* If 0, this file did not have a NM field */
out:
- if (buffer)
- kfree(buffer);
- return 0;
+ kfree(rs.buffer);
+ return ret;
}
static int
parse_rock_ridge_inode_internal(struct iso_directory_record *de,
struct inode *inode, int regard_xa)
{
- int len;
- unsigned char *chr;
int symlink_len = 0;
int cnt, sig;
struct inode *reloc;
struct rock_ridge *rr;
int rootflag;
- int cont_extent = 0;
- int cont_offset = 0;
- int cont_size = 0;
- void *buffer = NULL;
+ struct rock_state rs;
+ int ret = 0;
if (!ISOFS_SB(inode->i_sb)->s_rock)
return 0;
- setup_rock_ridge(de, inode, &chr, &len);
+ init_rock_state(&rs, inode);
+ setup_rock_ridge(de, inode, &rs);
if (regard_xa) {
- chr += 14;
- len -= 14;
- if (len < 0)
- len = 0;
+ rs.chr += 14;
+ rs.len -= 14;
+ if (rs.len < 0)
+ rs.len = 0;
}
repeat:
- while (len > 2) { /* There may be one byte for padding somewhere */
- rr = (struct rock_ridge *)chr;
+ while (rs.len > 2) { /* There may be one byte for padding somewhere */
+ rr = (struct rock_ridge *)rs.chr;
if (rr->len < 3)
goto out; /* Something got screwed up here */
- sig = isonum_721(chr);
- chr += rr->len;
- len -= rr->len;
- if (len < 0)
+ sig = isonum_721(rs.chr);
+ rs.chr += rr->len;
+ rs.len -= rr->len;
+ if (rs.len < 0)
goto out; /* corrupted isofs */
switch (sig) {
@@ -225,9 +246,9 @@ repeat:
goto out;
break;
case SIG('C', 'E'):
- cont_extent = isonum_733(rr->u.CE.extent);
- cont_offset = isonum_733(rr->u.CE.offset);
- cont_size = isonum_733(rr->u.CE.size);
+ rs.cont_extent = isonum_733(rr->u.CE.extent);
+ rs.cont_offset = isonum_733(rr->u.CE.offset);
+ rs.cont_size = isonum_733(rr->u.CE.size);
break;
case SIG('E', 'R'):
ISOFS_SB(inode->i_sb)->s_rock = 1;
@@ -433,11 +454,14 @@ repeat:
break;
}
}
- MAYBE_CONTINUE(repeat, inode);
+ ret = rock_continue(&rs);
+ if (ret == 0)
+ goto repeat;
+ if (ret == 1)
+ ret = 0;
out:
- if (buffer)
- kfree(buffer);
- return 0;
+ kfree(rs.buffer);
+ return ret;
}
static char *get_symlink_chunk(char *rpnt, struct rock_ridge *rr, char *plimit)
@@ -533,19 +557,16 @@ static int rock_ridge_symlink_readpage(struct file *file, struct page *page)
char *rpnt = link;
unsigned char *pnt;
struct iso_directory_record *raw_de;
- int cont_extent = 0;
- int cont_offset = 0;
- int cont_size = 0;
- void *buffer = NULL;
unsigned long block, offset;
int sig;
- int len;
- unsigned char *chr;
struct rock_ridge *rr;
+ struct rock_state rs;
+ int ret;
if (!ISOFS_SB(inode->i_sb)->s_rock)
goto error;
+ init_rock_state(&rs, inode);
block = ei->i_iget5_block;
lock_kernel();
bh = sb_bread(inode->i_sb, block);
@@ -566,17 +587,17 @@ static int rock_ridge_symlink_readpage(struct file *file, struct page *page)
/* Now test for possible Rock Ridge extensions which will override
some of these numbers in the inode structure. */
- setup_rock_ridge(raw_de, inode, &chr, &len);
+ setup_rock_ridge(raw_de, inode, &rs);
repeat:
- while (len > 2) { /* There may be one byte for padding somewhere */
- rr = (struct rock_ridge *)chr;
+ while (rs.len > 2) { /* There may be one byte for padding somewhere */
+ rr = (struct rock_ridge *)rs.chr;
if (rr->len < 3)
goto out; /* Something got screwed up here */
- sig = isonum_721(chr);
- chr += rr->len;
- len -= rr->len;
- if (len < 0)
+ sig = isonum_721(rs.chr);
+ rs.chr += rr->len;
+ rs.len -= rr->len;
+ if (rs.len < 0)
goto out; /* corrupted isofs */
switch (sig) {
@@ -596,15 +617,18 @@ repeat:
break;
case SIG('C', 'E'):
/* This tells is if there is a continuation record */
- cont_extent = isonum_733(rr->u.CE.extent);
- cont_offset = isonum_733(rr->u.CE.offset);
- cont_size = isonum_733(rr->u.CE.size);
+ rs.cont_extent = isonum_733(rr->u.CE.extent);
+ rs.cont_offset = isonum_733(rr->u.CE.offset);
+ rs.cont_size = isonum_733(rr->u.CE.size);
default:
break;
}
}
- MAYBE_CONTINUE(repeat, inode);
- kfree(buffer);
+ ret = rock_continue(&rs);
+ if (ret == 0)
+ goto repeat;
+ if (ret < 0)
+ goto fail;
if (rpnt == link)
goto fail;
@@ -618,8 +642,7 @@ repeat:
/* error exit from macro */
out:
- if (buffer)
- kfree(buffer);
+ kfree(rs.buffer);
goto fail;
out_noread:
printk("unable to read i-node block");
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-17 00:55:44 +0000