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-rw-r--r--fs/isofs/dir.c144
1 files changed, 77 insertions, 67 deletions
diff --git a/fs/isofs/dir.c b/fs/isofs/dir.c
index 27e276987fd..b943cbd963b 100644
--- a/fs/isofs/dir.c
+++ b/fs/isofs/dir.c
@@ -7,34 +7,18 @@
*
* Steve Beynon : Missing last directory entries fixed
* (stephen@askone.demon.co.uk) : 21st June 1996
- *
+ *
* isofs directory handling functions
*/
-#include <linux/smp_lock.h>
+#include <linux/gfp.h>
#include "isofs.h"
-static int isofs_readdir(struct file *, void *, filldir_t);
-
-const struct file_operations isofs_dir_operations =
-{
- .read = generic_read_dir,
- .readdir = isofs_readdir,
-};
-
-/*
- * directories can handle most operations...
- */
-struct inode_operations isofs_dir_inode_operations =
-{
- .lookup = isofs_lookup,
-};
-
int isofs_name_translate(struct iso_directory_record *de, char *new, struct inode *inode)
{
char * old = de->name;
int len = de->name_len[0];
int i;
-
+
for (i = 0; i < len; i++) {
unsigned char c = old[i];
if (!c)
@@ -62,22 +46,27 @@ int isofs_name_translate(struct iso_directory_record *de, char *new, struct inod
}
/* Acorn extensions written by Matthew Wilcox <willy@bofh.ai> 1998 */
-int get_acorn_filename(struct iso_directory_record * de,
- char * retname, struct inode * inode)
+int get_acorn_filename(struct iso_directory_record *de,
+ char *retname, struct inode *inode)
{
int std;
- unsigned char * chr;
+ unsigned char *chr;
int retnamlen = isofs_name_translate(de, retname, inode);
- if (retnamlen == 0) return 0;
+
+ if (retnamlen == 0)
+ return 0;
std = sizeof(struct iso_directory_record) + de->name_len[0];
- if (std & 1) std++;
- if ((*((unsigned char *) de) - std) != 32) return retnamlen;
+ if (std & 1)
+ std++;
+ if ((*((unsigned char *) de) - std) != 32)
+ return retnamlen;
chr = ((unsigned char *) de) + std;
- if (strncmp(chr, "ARCHIMEDES", 10)) return retnamlen;
- if ((*retname == '_') && ((chr[19] & 1) == 1)) *retname = '!';
+ if (strncmp(chr, "ARCHIMEDES", 10))
+ return retnamlen;
+ if ((*retname == '_') && ((chr[19] & 1) == 1))
+ *retname = '!';
if (((de->flags[0] & 2) == 0) && (chr[13] == 0xff)
- && ((chr[12] & 0xf0) == 0xf0))
- {
+ && ((chr[12] & 0xf0) == 0xf0)) {
retname[retnamlen] = ',';
sprintf(retname+retnamlen+1, "%3.3x",
((chr[12] & 0xf) << 8) | chr[11]);
@@ -89,9 +78,9 @@ int get_acorn_filename(struct iso_directory_record * de,
/*
* This should _really_ be cleaned up some day..
*/
-static int do_isofs_readdir(struct inode *inode, struct file *filp,
- void *dirent, filldir_t filldir,
- char * tmpname, struct iso_directory_record * tmpde)
+static int do_isofs_readdir(struct inode *inode, struct file *file,
+ struct dir_context *ctx,
+ char *tmpname, struct iso_directory_record *tmpde)
{
unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
unsigned char bufbits = ISOFS_BUFFER_BITS(inode);
@@ -105,10 +94,10 @@ static int do_isofs_readdir(struct inode *inode, struct file *filp,
struct iso_directory_record *de;
struct isofs_sb_info *sbi = ISOFS_SB(inode->i_sb);
- offset = filp->f_pos & (bufsize - 1);
- block = filp->f_pos >> bufbits;
+ offset = ctx->pos & (bufsize - 1);
+ block = ctx->pos >> bufbits;
- while (filp->f_pos < inode->i_size) {
+ while (ctx->pos < inode->i_size) {
int de_len;
if (!bh) {
@@ -119,17 +108,19 @@ static int do_isofs_readdir(struct inode *inode, struct file *filp,
de = (struct iso_directory_record *) (bh->b_data + offset);
- de_len = *(unsigned char *) de;
+ de_len = *(unsigned char *)de;
- /* If the length byte is zero, we should move on to the next
- CDROM sector. If we are at the end of the directory, we
- kick out of the while loop. */
+ /*
+ * If the length byte is zero, we should move on to the next
+ * CDROM sector. If we are at the end of the directory, we
+ * kick out of the while loop.
+ */
if (de_len == 0) {
brelse(bh);
bh = NULL;
- filp->f_pos = (filp->f_pos + ISOFS_BLOCK_SIZE) & ~(ISOFS_BLOCK_SIZE - 1);
- block = filp->f_pos >> bufbits;
+ ctx->pos = (ctx->pos + ISOFS_BLOCK_SIZE) & ~(ISOFS_BLOCK_SIZE - 1);
+ block = ctx->pos >> bufbits;
offset = 0;
continue;
}
@@ -154,28 +145,35 @@ static int do_isofs_readdir(struct inode *inode, struct file *filp,
}
de = tmpde;
}
+ /* Basic sanity check, whether name doesn't exceed dir entry */
+ if (de_len < de->name_len[0] +
+ sizeof(struct iso_directory_record)) {
+ printk(KERN_NOTICE "iso9660: Corrupted directory entry"
+ " in block %lu of inode %lu\n", block,
+ inode->i_ino);
+ return -EIO;
+ }
if (first_de) {
isofs_normalize_block_and_offset(de,
- &block_saved,
- &offset_saved);
+ &block_saved,
+ &offset_saved);
inode_number = isofs_get_ino(block_saved,
- offset_saved,
- bufbits);
+ offset_saved, bufbits);
}
if (de->flags[-sbi->s_high_sierra] & 0x80) {
first_de = 0;
- filp->f_pos += de_len;
+ ctx->pos += de_len;
continue;
}
first_de = 1;
/* Handle the case of the '.' directory */
if (de->name_len[0] == 1 && de->name[0] == 0) {
- if (filldir(dirent, ".", 1, filp->f_pos, inode->i_ino, DT_DIR) < 0)
+ if (!dir_emit_dot(file, ctx))
break;
- filp->f_pos += de_len;
+ ctx->pos += de_len;
continue;
}
@@ -183,10 +181,9 @@ static int do_isofs_readdir(struct inode *inode, struct file *filp,
/* Handle the case of the '..' directory */
if (de->name_len[0] == 1 && de->name[0] == 1) {
- inode_number = parent_ino(filp->f_dentry);
- if (filldir(dirent, "..", 2, filp->f_pos, inode_number, DT_DIR) < 0)
+ if (!dir_emit_dotdot(file, ctx))
break;
- filp->f_pos += de_len;
+ ctx->pos += de_len;
continue;
}
@@ -197,11 +194,10 @@ static int do_isofs_readdir(struct inode *inode, struct file *filp,
* Do not report hidden files if so instructed, or associated
* files unless instructed to do so
*/
- if ((sbi->s_hide == 'y' &&
- (de->flags[-sbi->s_high_sierra] & 1)) ||
- (sbi->s_showassoc =='n' &&
+ if ((sbi->s_hide && (de->flags[-sbi->s_high_sierra] & 1)) ||
+ (!sbi->s_showassoc &&
(de->flags[-sbi->s_high_sierra] & 4))) {
- filp->f_pos += de_len;
+ ctx->pos += de_len;
continue;
}
@@ -233,14 +229,15 @@ static int do_isofs_readdir(struct inode *inode, struct file *filp,
}
}
if (len > 0) {
- if (filldir(dirent, p, len, filp->f_pos, inode_number, DT_UNKNOWN) < 0)
+ if (!dir_emit(ctx, p, len, inode_number, DT_UNKNOWN))
break;
}
- filp->f_pos += de_len;
+ ctx->pos += de_len;
continue;
}
- if (bh) brelse(bh);
+ if (bh)
+ brelse(bh);
return 0;
}
@@ -249,25 +246,38 @@ static int do_isofs_readdir(struct inode *inode, struct file *filp,
* handling split directory entries.. The real work is done by
* "do_isofs_readdir()".
*/
-static int isofs_readdir(struct file *filp,
- void *dirent, filldir_t filldir)
+static int isofs_readdir(struct file *file, struct dir_context *ctx)
{
int result;
- char * tmpname;
- struct iso_directory_record * tmpde;
- struct inode *inode = filp->f_dentry->d_inode;
-
+ char *tmpname;
+ struct iso_directory_record *tmpde;
+ struct inode *inode = file_inode(file);
tmpname = (char *)__get_free_page(GFP_KERNEL);
if (tmpname == NULL)
return -ENOMEM;
- lock_kernel();
tmpde = (struct iso_directory_record *) (tmpname+1024);
- result = do_isofs_readdir(inode, filp, dirent, filldir, tmpname, tmpde);
+ result = do_isofs_readdir(inode, file, ctx, tmpname, tmpde);
free_page((unsigned long) tmpname);
- unlock_kernel();
return result;
}
+
+const struct file_operations isofs_dir_operations =
+{
+ .llseek = generic_file_llseek,
+ .read = generic_read_dir,
+ .iterate = isofs_readdir,
+};
+
+/*
+ * directories can handle most operations...
+ */
+const struct inode_operations isofs_dir_inode_operations =
+{
+ .lookup = isofs_lookup,
+};
+
+
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-07 09:55:34 +0000