ldiskfs/kernel_patches/patches/ext3-max-dir-size.patch

   1 Index: linux-2.6.18-92.1.17/fs/ext3/ialloc.c
   2 ===================================================================
   3 --- linux-2.6.18-92.1.17.orig/fs/ext3/ialloc.c
   4 +++ linux-2.6.18-92.1.17/fs/ext3/ialloc.c
   5 @@ -521,12 +521,15 @@ struct inode *ext3_new_inode(handle_t *h
   6                 return ERR_PTR(-EPERM);
   7
   8         sb = dir->i_sb;
   9 +       sbi = EXT3_SB(sb);
  10 +       if (sbi->s_max_dir_size > 0 && i_size_read(dir) >= sbi->s_max_dir_size)
  11 +               return ERR_PTR(-EFBIG);
  12 +
  13         inode = new_inode(sb);
  14         if (!inode)
  15                 return ERR_PTR(-ENOMEM);
  16         ei = EXT3_I(inode);
  17
  18 -       sbi = EXT3_SB(sb);
  19         es = sbi->s_es;
  20         if (goal) {
  21                 group = (goal - 1) / EXT3_INODES_PER_GROUP(sb);
  22 Index: linux-2.6.18-92.1.17/fs/ext3/super.c
  23 ===================================================================
  24 --- linux-2.6.18-92.1.17.orig/fs/ext3/super.c
  25 +++ linux-2.6.18-92.1.17/fs/ext3/super.c
  26 @@ -45,6 +45,12 @@
  27  #include "namei.h"
  28  #include "group.h"
  29
  30 +/*
  31 + * max directory size tunable
  32 + */
  33 +#define EXT3_DEFAULT_MAX_DIR_SIZE              0
  34 +#define EXT3_MAX_DIR_SIZE_NAME         "max_dir_size"
  35 +
  36  static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
  37                              unsigned long journal_devnum);
  38  static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
  39 @@ -439,6 +445,7 @@ static void ext3_put_super (struct super
  40         }
  41         if (sbi->s_mmp_tsk)
  42                 kthread_stop(sbi->s_mmp_tsk);
  43 +       remove_proc_entry(EXT3_MAX_DIR_SIZE_NAME, sbi->s_dev_proc);
  44         if (sbi->s_dev_proc) {
  45                 remove_proc_entry(sbi->s_dev_proc->name, proc_root_ext3);
  46                 sbi->s_dev_proc = NULL;
  47 @@ -1854,6 +1861,45 @@ failed:
  48         return 1;
  49  }
  50
  51 +static int ext3_max_dir_size_read(char *page, char **start, off_t off,
  52 +                                  int count, int *eof, void *data)
  53 +{
  54 +       struct ext3_sb_info *sbi = data;
  55 +       int len;
  56 +
  57 +       *eof = 1;
  58 +       if (off != 0)
  59 +               return 0;
  60 +
  61 +       len = sprintf(page, "%lu\n", sbi->s_max_dir_size);
  62 +       *start = page;
  63 +       return len;
  64 +}
  65 +
  66 +static int ext3_max_dir_size_write(struct file *file, const char *buffer,
  67 +                                   unsigned long count, void *data)
  68 +{
  69 +       struct ext3_sb_info *sbi = data;
  70 +       char str[32];
  71 +       unsigned long value;
  72 +       char *end;
  73 +
  74 +       if (count >= sizeof(str)) {
  75 +               printk(KERN_ERR "EXT3-fs: %s string too long, max %u bytes\n",
  76 +                      EXT3_MAX_DIR_SIZE_NAME, (int)sizeof(str));
  77 +               return -EOVERFLOW;
  78 +       }
  79 +
  80 +       if (copy_from_user(str, buffer, count))
  81 +               return -EFAULT;
  82 +
  83 +       value = simple_strtol(str, &end, 0);
  84 +       if (value < 0)
  85 +               return -ERANGE;
  86 +
  87 +       sbi->s_max_dir_size = value;
  88 +       return count;
  89 +}
  90
  91  static int ext3_fill_super (struct super_block *sb, void *data, int silent)
  92  {
  93 @@ -1875,6 +1921,7 @@ static int ext3_fill_super (struct super
  94         int i;
  95         int needs_recovery;
  96         __le32 features;
  97 +       struct proc_dir_entry *proc;
  98
  99         sbi = kmalloc(sizeof(*sbi), GFP_KERNEL);
 100         if (!sbi)
 101 @@ -1903,6 +1950,23 @@ static int ext3_fill_super (struct super
 102
 103         unlock_kernel();
 104
 105 +       sbi->s_max_dir_size = EXT3_DEFAULT_MAX_DIR_SIZE;
 106 +       proc = create_proc_entry(EXT3_MAX_DIR_SIZE_NAME,
 107 +                                S_IFREG | S_IRUGO | S_IWUSR, sbi->s_dev_proc);
 108 +       if (proc == NULL) {
 109 +               printk(KERN_ERR "EXT3-fs: unable to create %s\n",
 110 +                      EXT3_MAX_DIR_SIZE_NAME);
 111 +               remove_proc_entry(EXT3_MAX_DIR_SIZE_NAME, sbi->s_dev_proc);
 112 +               remove_proc_entry(sb->s_id, proc_root_ext3);
 113 +               sbi->s_dev_proc = NULL;
 114 +               sb->s_fs_info = NULL;
 115 +               kfree(sbi);
 116 +               return -ENOMEM;
 117 +       }
 118 +       proc->data = sbi;
 119 +       proc->read_proc = ext3_max_dir_size_read;
 120 +       proc->write_proc = ext3_max_dir_size_write;
 121 +
 122         blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
 123         if (!blocksize) {
 124                 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
 125 @@ -2338,6 +2402,7 @@ failed_mount:
 126         ext3_blkdev_remove(sbi);
 127         brelse(bh);
 128  out_fail:
 129 +       remove_proc_entry(EXT3_MAX_DIR_SIZE_NAME, sbi->s_dev_proc);
 130         if (sbi->s_dev_proc) {
 131                 remove_proc_entry(sbi->s_dev_proc->name, proc_root_ext3);
 132                 sbi->s_dev_proc = NULL;
 133 Index: linux-2.6.18-92.1.17/include/linux/ext3_fs_sb.h
 134 ===================================================================
 135 --- linux-2.6.18-92.1.17.orig/include/linux/ext3_fs_sb.h
 136 +++ linux-2.6.18-92.1.17/include/linux/ext3_fs_sb.h
 137 @@ -132,6 +132,8 @@ struct ext3_sb_info {
 138         unsigned long s_mb_last_group;
 139         unsigned long s_mb_last_start;
 140
 141 +       unsigned long s_max_dir_size;
 142 +
 143         /* history to debug policy */
 144         struct ext3_mb_history *s_mb_history;
 145         int s_mb_history_cur;