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vfs: check i_nlink limits in vfs_{mkdir,rename_dir,link}

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New field of struct super_block - ->s_max_links.  Maximal allowed
value of ->i_nlink or 0; in the latter case all checks still need
to be done in ->link/->mkdir/->rename instances.  Note that this
limit applies both to directoris and to non-directories.

Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Al Viro 2012-02-06 12:45:27 -05:00
commit 8de5277879
26 changed files with 46 additions and 149 deletions
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13
fs/jfs/namei.c
View file

@ -220,12 +220,6 @@ static int jfs_mkdir(struct inode *dip, struct dentry *dentry, umode_t mode)
dquot_initialize(dip);
/* link count overflow on parent directory ? */
if (dip->i_nlink == JFS_LINK_MAX) {
rc = -EMLINK;
goto out1;
}
/*
* search parent directory for entry/freespace
* (dtSearch() returns parent directory page pinned)
@ -806,9 +800,6 @@ static int jfs_link(struct dentry *old_dentry,
jfs_info("jfs_link: %s %s", old_dentry->d_name.name,
dentry->d_name.name);
if (ip->i_nlink == JFS_LINK_MAX)
return -EMLINK;
dquot_initialize(dir);
tid = txBegin(ip->i_sb, 0);
@ -1138,10 +1129,6 @@ static int jfs_rename(struct inode *old_dir, struct dentry *old_dentry,
rc = -ENOTEMPTY;
goto out3;
}
} else if ((new_dir != old_dir) &&
(new_dir->i_nlink == JFS_LINK_MAX)) {
rc = -EMLINK;
goto out3;
}
} else if (new_ip) {
IWRITE_LOCK(new_ip, RDWRLOCK_NORMAL);

1
fs/jfs/super.c
View file

@ -441,6 +441,7 @@ static int jfs_fill_super(struct super_block *sb, void *data, int silent)
return -ENOMEM;
sb->s_fs_info = sbi;
sb->s_max_links = JFS_LINK_MAX;
sbi->sb = sb;
sbi->uid = sbi->gid = sbi->umask = -1;