Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 565 insertions, 0 deletions

diff --git a/fs/isofs/rock.c b/fs/isofs/rock.c
new file mode 100644
index 000000000000..8bdd3e409543
--- /dev/null
+++ b/fs/isofs/rock.c
@@ -0,0 +1,565 @@
+/*
+ *  linux/fs/isofs/rock.c
+ *
+ *  (C) 1992, 1993  Eric Youngdale
+ *
+ *  Rock Ridge Extensions to iso9660
+ */
+
+#include <linux/stat.h>
+#include <linux/time.h>
+#include <linux/iso_fs.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/pagemap.h>
+#include <linux/smp_lock.h>
+#include <linux/buffer_head.h>
+#include <asm/page.h>
+
+#include "rock.h"
+
+/* These functions are designed to read the system areas of a directory record
+ * and extract relevant information.  There are different functions provided
+ * depending upon what information we need at the time.  One function fills
+ * out an inode structure, a second one extracts a filename, a third one
+ * returns a symbolic link name, and a fourth one returns the extent number
+ * for the file. */
+
+#define SIG(A,B) ((A) | ((B) << 8)) /* isonum_721() */
+
+
+/* This is a way of ensuring that we have something in the system
+   use fields that is compatible with Rock Ridge */
+#define CHECK_SP(FAIL)                          \
+      if(rr->u.SP.magic[0] != 0xbe) FAIL;       \
+      if(rr->u.SP.magic[1] != 0xef) FAIL;       \
+      ISOFS_SB(inode->i_sb)->s_rock_offset=rr->u.SP.skip;
+/* We define a series of macros because each function must do exactly the
+   same thing in certain places.  We use the macros to ensure that everything
+   is done correctly */
+
+#define CONTINUE_DECLS \
+  int cont_extent = 0, cont_offset = 0, cont_size = 0;   \
+  void *buffer = NULL
+
+#define CHECK_CE                                \
+      {cont_extent = isonum_733(rr->u.CE.extent); \
+      cont_offset = isonum_733(rr->u.CE.offset); \
+      cont_size = isonum_733(rr->u.CE.size);}
+
+#define SETUP_ROCK_RIDGE(DE,CHR,LEN)                            \
+  {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;                                             \
+  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;                                          \
+  }                                                             \
+}                                     
+
+#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");    \
+  }}
+
+/* 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;
+  CONTINUE_DECLS;
+  int retnamlen = 0, truncate=0;
+ 
+  if (!ISOFS_SB(inode->i_sb)->s_rock) return 0;
+  *retname = 0;
+
+  SETUP_ROCK_RIDGE(de, chr, len);
+ repeat:
+  {
+    struct rock_ridge * rr;
+    int sig;
+    
+    while (len > 2){ /* There may be one byte for padding somewhere */
+      rr = (struct rock_ridge *) 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) goto out;    /* corrupted isofs */
+
+      switch(sig){
+      case SIG('R','R'):
+        if((rr->u.RR.flags[0] & RR_NM) == 0) goto out;
+        break;
+      case SIG('S','P'):
+        CHECK_SP(goto out);
+        break;
+      case SIG('C','E'):
+        CHECK_CE;
+        break;
+      case SIG('N','M'):
+        if (truncate) break;
+        if (rr->len < 5) break;
+        /*
+         * If the flags are 2 or 4, this indicates '.' or '..'.
+         * We don't want to do anything with this, because it
+         * screws up the code that calls us.  We don't really
+         * care anyways, since we can just use the non-RR
+         * name.
+         */
+        if (rr->u.NM.flags & 6) {
+          break;
+        }
+
+        if (rr->u.NM.flags & ~1) {
+          printk("Unsupported NM flag settings (%d)\n",rr->u.NM.flags);
+          break;
+        }
+        if((strlen(retname) + rr->len - 5) >= 254) {
+          truncate = 1;
+          break;
+        }
+        strncat(retname, rr->u.NM.name, rr->len - 5);
+        retnamlen += rr->len - 5;
+        break;
+      case SIG('R','E'):
+        if (buffer) kfree(buffer);
+        return -1;
+      default:
+        break;
+      }
+    }
+  }
+  MAYBE_CONTINUE(repeat,inode);
+  if (buffer) kfree(buffer);
+  return retnamlen; /* If 0, this file did not have a NM field */
+ out:
+  if(buffer) kfree(buffer);
+  return 0;
+}
+
+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;
+  CONTINUE_DECLS;
+
+  if (!ISOFS_SB(inode->i_sb)->s_rock) return 0;
+
+  SETUP_ROCK_RIDGE(de, chr, len);
+  if (regard_xa)
+   {
+     chr+=14;
+     len-=14;
+     if (len<0) len=0;
+   }
+   
+ repeat:
+  {
+    int cnt, sig;
+    struct inode * reloc;
+    struct rock_ridge * rr;
+    int rootflag;
+    
+    while (len > 2){ /* There may be one byte for padding somewhere */
+      rr = (struct rock_ridge *) 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) goto out;    /* corrupted isofs */
+      
+      switch(sig){
+#ifndef CONFIG_ZISOFS           /* No flag for SF or ZF */
+      case SIG('R','R'):
+        if((rr->u.RR.flags[0] & 
+            (RR_PX | RR_TF | RR_SL | RR_CL)) == 0) goto out;
+        break;
+#endif
+      case SIG('S','P'):
+        CHECK_SP(goto out);
+        break;
+      case SIG('C','E'):
+        CHECK_CE;
+        break;
+      case SIG('E','R'):
+        ISOFS_SB(inode->i_sb)->s_rock = 1;
+        printk(KERN_DEBUG "ISO 9660 Extensions: ");
+        { int p;
+          for(p=0;p<rr->u.ER.len_id;p++) printk("%c",rr->u.ER.data[p]);
+        }
+          printk("\n");
+        break;
+      case SIG('P','X'):
+        inode->i_mode  = isonum_733(rr->u.PX.mode);
+        inode->i_nlink = isonum_733(rr->u.PX.n_links);
+        inode->i_uid   = isonum_733(rr->u.PX.uid);
+        inode->i_gid   = isonum_733(rr->u.PX.gid);
+        break;
+      case SIG('P','N'):
+        { int high, low;
+          high = isonum_733(rr->u.PN.dev_high);
+          low = isonum_733(rr->u.PN.dev_low);
+          /*
+           * The Rock Ridge standard specifies that if sizeof(dev_t) <= 4,
+           * then the high field is unused, and the device number is completely
+           * stored in the low field.  Some writers may ignore this subtlety,
+           * and as a result we test to see if the entire device number is
+           * stored in the low field, and use that.
+           */
+          if((low & ~0xff) && high == 0) {
+            inode->i_rdev = MKDEV(low >> 8, low & 0xff);
+          } else {
+            inode->i_rdev = MKDEV(high, low);
+          }
+        }
+        break;
+      case SIG('T','F'):
+        /* Some RRIP writers incorrectly place ctime in the TF_CREATE field.
+           Try to handle this correctly for either case. */
+        cnt = 0; /* Rock ridge never appears on a High Sierra disk */
+        if(rr->u.TF.flags & TF_CREATE) { 
+          inode->i_ctime.tv_sec = iso_date(rr->u.TF.times[cnt++].time, 0);
+          inode->i_ctime.tv_nsec = 0;
+        }
+        if(rr->u.TF.flags & TF_MODIFY) {
+          inode->i_mtime.tv_sec = iso_date(rr->u.TF.times[cnt++].time, 0);
+          inode->i_mtime.tv_nsec = 0;
+        }
+        if(rr->u.TF.flags & TF_ACCESS) {
+          inode->i_atime.tv_sec = iso_date(rr->u.TF.times[cnt++].time, 0);
+          inode->i_atime.tv_nsec = 0;
+        }
+        if(rr->u.TF.flags & TF_ATTRIBUTES) { 
+          inode->i_ctime.tv_sec = iso_date(rr->u.TF.times[cnt++].time, 0);
+          inode->i_ctime.tv_nsec = 0;
+        } 
+        break;
+      case SIG('S','L'):
+        {int slen;
+         struct SL_component * slp;
+         struct SL_component * oldslp;
+         slen = rr->len - 5;
+         slp = &rr->u.SL.link;
+         inode->i_size = symlink_len;
+         while (slen > 1){
+           rootflag = 0;
+           switch(slp->flags &~1){
+           case 0:
+             inode->i_size += slp->len;
+             break;
+           case 2:
+             inode->i_size += 1;
+             break;
+           case 4:
+             inode->i_size += 2;
+             break;
+           case 8:
+             rootflag = 1;
+             inode->i_size += 1;
+             break;
+           default:
+             printk("Symlink component flag not implemented\n");
+           }
+           slen -= slp->len + 2;
+           oldslp = slp;
+           slp = (struct SL_component *) (((char *) slp) + slp->len + 2);
+
+           if(slen < 2) {
+             if(    ((rr->u.SL.flags & 1) != 0) 
+                    && ((oldslp->flags & 1) == 0) ) inode->i_size += 1;
+             break;
+           }
+
+           /*
+            * If this component record isn't continued, then append a '/'.
+            */
+           if (!rootflag && (oldslp->flags & 1) == 0)
+                   inode->i_size += 1;
+         }
+        }
+        symlink_len = inode->i_size;
+        break;
+      case SIG('R','E'):
+        printk(KERN_WARNING "Attempt to read inode for relocated directory\n");
+        goto out;
+      case SIG('C','L'):
+        ISOFS_I(inode)->i_first_extent = isonum_733(rr->u.CL.location);
+        reloc = isofs_iget(inode->i_sb, ISOFS_I(inode)->i_first_extent, 0);
+        if (!reloc)
+                goto out;
+        inode->i_mode = reloc->i_mode;
+        inode->i_nlink = reloc->i_nlink;
+        inode->i_uid = reloc->i_uid;
+        inode->i_gid = reloc->i_gid;
+        inode->i_rdev = reloc->i_rdev;
+        inode->i_size = reloc->i_size;
+        inode->i_blocks = reloc->i_blocks;
+        inode->i_atime = reloc->i_atime;
+        inode->i_ctime = reloc->i_ctime;
+        inode->i_mtime = reloc->i_mtime;
+        iput(reloc);
+        break;
+#ifdef CONFIG_ZISOFS
+      case SIG('Z','F'):
+              if ( !ISOFS_SB(inode->i_sb)->s_nocompress ) {
+                      int algo;
+                      algo = isonum_721(rr->u.ZF.algorithm);
+                      if ( algo == SIG('p','z') ) {
+                              int block_shift = isonum_711(&rr->u.ZF.parms[1]);
+                              if ( block_shift < PAGE_CACHE_SHIFT || block_shift > 17 ) {
+                                      printk(KERN_WARNING "isofs: Can't handle ZF block size of 2^%d\n", block_shift);
+                              } else {
+                                /* Note: we don't change i_blocks here */
+                                      ISOFS_I(inode)->i_file_format = isofs_file_compressed;
+                                /* Parameters to compression algorithm (header size, block size) */
+                                      ISOFS_I(inode)->i_format_parm[0] = isonum_711(&rr->u.ZF.parms[0]);
+                                      ISOFS_I(inode)->i_format_parm[1] = isonum_711(&rr->u.ZF.parms[1]);
+                                      inode->i_size = isonum_733(rr->u.ZF.real_size);
+                              }
+                      } else {
+                              printk(KERN_WARNING "isofs: Unknown ZF compression algorithm: %c%c\n",
+                                     rr->u.ZF.algorithm[0], rr->u.ZF.algorithm[1]);
+                      }
+              }
+              break;
+#endif
+      default:
+        break;
+      }
+    }
+  }
+  MAYBE_CONTINUE(repeat,inode);
+ out:
+  if(buffer) kfree(buffer);
+  return 0;
+}
+
+static char *get_symlink_chunk(char *rpnt, struct rock_ridge *rr, char *plimit)
+{
+        int slen;
+        int rootflag;
+        struct SL_component *oldslp;
+        struct SL_component *slp;
+        slen = rr->len - 5;
+        slp = &rr->u.SL.link;
+        while (slen > 1) {
+                rootflag = 0;
+                switch (slp->flags & ~1) {
+                case 0:
+                        if (slp->len > plimit - rpnt)
+                                return NULL;
+                        memcpy(rpnt, slp->text, slp->len);
+                        rpnt+=slp->len;
+                        break;
+                case 2:
+                        if (rpnt >= plimit)
+                                return NULL;
+                        *rpnt++='.';
+                        break;
+                case 4:
+                        if (2 > plimit - rpnt)
+                                return NULL;
+                        *rpnt++='.';
+                        *rpnt++='.';
+                        break;
+                case 8:
+                        if (rpnt >= plimit)
+                                return NULL;
+                        rootflag = 1;
+                        *rpnt++='/';
+                        break;
+                default:
+                        printk("Symlink component flag not implemented (%d)\n",
+                             slp->flags);
+                }
+                slen -= slp->len + 2;
+                oldslp = slp;
+                slp = (struct SL_component *) ((char *) slp + slp->len + 2);
+
+                if (slen < 2) {
+                        /*
+                         * If there is another SL record, and this component
+                         * record isn't continued, then add a slash.
+                         */
+                        if ((!rootflag) && (rr->u.SL.flags & 1) &&
+                            !(oldslp->flags & 1)) {
+                                if (rpnt >= plimit)
+                                        return NULL;
+                                *rpnt++='/';
+                        }
+                        break;
+                }
+
+                /*
+                 * If this component record isn't continued, then append a '/'.
+                 */
+                if (!rootflag && !(oldslp->flags & 1)) {
+                        if (rpnt >= plimit)
+                                return NULL;
+                        *rpnt++='/';
+                }
+        }
+        return rpnt;
+}
+
+int parse_rock_ridge_inode(struct iso_directory_record * de,
+                           struct inode * inode)
+{
+   int result=parse_rock_ridge_inode_internal(de,inode,0);
+   /* if rockridge flag was reset and we didn't look for attributes
+    * behind eventual XA attributes, have a look there */
+   if ((ISOFS_SB(inode->i_sb)->s_rock_offset==-1)
+       &&(ISOFS_SB(inode->i_sb)->s_rock==2))
+     {
+        result=parse_rock_ridge_inode_internal(de,inode,14);
+     }
+   return result;
+}
+
+/* readpage() for symlinks: reads symlink contents into the page and either
+   makes it uptodate and returns 0 or returns error (-EIO) */
+
+static int rock_ridge_symlink_readpage(struct file *file, struct page *page)
+{
+        struct inode *inode = page->mapping->host;
+        struct iso_inode_info *ei = ISOFS_I(inode);
+        char *link = kmap(page);
+        unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
+        struct buffer_head *bh;
+        char *rpnt = link;
+        unsigned char *pnt;
+        struct iso_directory_record *raw_inode;
+        CONTINUE_DECLS;
+        unsigned long block, offset;
+        int sig;
+        int len;
+        unsigned char *chr;
+        struct rock_ridge *rr;
+
+        if (!ISOFS_SB(inode->i_sb)->s_rock)
+                goto error;
+
+        block = ei->i_iget5_block;
+        lock_kernel();
+        bh = sb_bread(inode->i_sb, block);
+        if (!bh)
+                goto out_noread;
+
+        offset = ei->i_iget5_offset;
+        pnt = (unsigned char *) bh->b_data + offset;
+
+        raw_inode = (struct iso_directory_record *) pnt;
+
+        /*
+         * If we go past the end of the buffer, there is some sort of error.
+         */
+        if (offset + *pnt > bufsize)
+                goto out_bad_span;
+
+        /* Now test for possible Rock Ridge extensions which will override
+           some of these numbers in the inode structure. */
+
+        SETUP_ROCK_RIDGE(raw_inode, chr, len);
+
+      repeat:
+        while (len > 2) { /* There may be one byte for padding somewhere */
+                rr = (struct rock_ridge *) 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)
+                        goto out;       /* corrupted isofs */
+
+                switch (sig) {
+                case SIG('R', 'R'):
+                        if ((rr->u.RR.flags[0] & RR_SL) == 0)
+                                goto out;
+                        break;
+                case SIG('S', 'P'):
+                        CHECK_SP(goto out);
+                        break;
+                case SIG('S', 'L'):
+                        rpnt = get_symlink_chunk(rpnt, rr,
+                                                 link + (PAGE_SIZE - 1));
+                        if (rpnt == NULL)
+                                goto out;
+                        break;
+                case SIG('C', 'E'):
+                        /* This tells is if there is a continuation record */
+                        CHECK_CE;
+                default:
+                        break;
+                }
+        }
+        MAYBE_CONTINUE(repeat, inode);
+        if (buffer)
+                kfree(buffer);
+
+        if (rpnt == link)
+                goto fail;
+        brelse(bh);
+        *rpnt = '\0';
+        unlock_kernel();
+        SetPageUptodate(page);
+        kunmap(page);
+        unlock_page(page);
+        return 0;
+
+        /* error exit from macro */
+      out:
+        if (buffer)
+                kfree(buffer);
+        goto fail;
+      out_noread:
+        printk("unable to read i-node block");
+        goto fail;
+      out_bad_span:
+        printk("symlink spans iso9660 blocks\n");
+      fail:
+        brelse(bh);
+        unlock_kernel();
+      error:
+        SetPageError(page);
+        kunmap(page);
+        unlock_page(page);
+        return -EIO;
+}
+
+struct address_space_operations isofs_symlink_aops = {
+        .readpage       = rock_ridge_symlink_readpage
+};