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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/ext2/namei.c
View file

@ -195,9 +195,6 @@ static int ext2_link (struct dentry * old_dentry, struct inode * dir,
struct inode *inode = old_dentry->d_inode;
int err;
if (inode->i_nlink >= EXT2_LINK_MAX)
return -EMLINK;
dquot_initialize(dir);
inode->i_ctime = CURRENT_TIME_SEC;
@ -217,10 +214,7 @@ static int ext2_link (struct dentry * old_dentry, struct inode * dir,
static int ext2_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
{
struct inode * inode;
int err = -EMLINK;
if (dir->i_nlink >= EXT2_LINK_MAX)
goto out;
int err;
dquot_initialize(dir);
@ -346,11 +340,6 @@ static int ext2_rename (struct inode * old_dir, struct dentry * old_dentry,
drop_nlink(new_inode);
inode_dec_link_count(new_inode);
} else {
if (dir_de) {
err = -EMLINK;
if (new_dir->i_nlink >= EXT2_LINK_MAX)
goto out_dir;
}
err = ext2_add_link(new_dentry, old_inode);
if (err)
goto out_dir;

1
fs/ext2/super.c
View file

@ -919,6 +919,7 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent)
}
sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits);
sb->s_max_links = EXT2_LINK_MAX;
if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) {
sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;