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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
Download patch file Download diff file Expand all files Collapse all files

10
fs/minix/inode.c
View file

@ -190,24 +190,24 @@ static int minix_fill_super(struct super_block *s, void *data, int silent)
sbi->s_version = MINIX_V1;
sbi->s_dirsize = 16;
sbi->s_namelen = 14;
sbi->s_link_max = MINIX_LINK_MAX;
s->s_max_links = MINIX_LINK_MAX;
} else if (s->s_magic == MINIX_SUPER_MAGIC2) {
sbi->s_version = MINIX_V1;
sbi->s_dirsize = 32;
sbi->s_namelen = 30;
sbi->s_link_max = MINIX_LINK_MAX;
s->s_max_links = MINIX_LINK_MAX;
} else if (s->s_magic == MINIX2_SUPER_MAGIC) {
sbi->s_version = MINIX_V2;
sbi->s_nzones = ms->s_zones;
sbi->s_dirsize = 16;
sbi->s_namelen = 14;
sbi->s_link_max = MINIX2_LINK_MAX;
s->s_max_links = MINIX2_LINK_MAX;
} else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
sbi->s_version = MINIX_V2;
sbi->s_nzones = ms->s_zones;
sbi->s_dirsize = 32;
sbi->s_namelen = 30;
sbi->s_link_max = MINIX2_LINK_MAX;
s->s_max_links = MINIX2_LINK_MAX;
} else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) {
m3s = (struct minix3_super_block *) bh->b_data;
s->s_magic = m3s->s_magic;
@ -221,9 +221,9 @@ static int minix_fill_super(struct super_block *s, void *data, int silent)
sbi->s_dirsize = 64;
sbi->s_namelen = 60;
sbi->s_version = MINIX_V3;
sbi->s_link_max = MINIX2_LINK_MAX;
sbi->s_mount_state = MINIX_VALID_FS;
sb_set_blocksize(s, m3s->s_blocksize);
s->s_max_links = MINIX2_LINK_MAX;
} else
goto out_no_fs;

1
fs/minix/minix.h
View file

@ -34,7 +34,6 @@ struct minix_sb_info {
unsigned long s_max_size;
int s_dirsize;
int s_namelen;
int s_link_max;
struct buffer_head ** s_imap;
struct buffer_head ** s_zmap;
struct buffer_head * s_sbh;

14
fs/minix/namei.c
View file

@ -94,9 +94,6 @@ static int minix_link(struct dentry * old_dentry, struct inode * dir,
{
struct inode *inode = old_dentry->d_inode;
if (inode->i_nlink >= minix_sb(inode->i_sb)->s_link_max)
return -EMLINK;
inode->i_ctime = CURRENT_TIME_SEC;
inode_inc_link_count(inode);
ihold(inode);
@ -106,10 +103,7 @@ static int minix_link(struct dentry * old_dentry, struct inode * dir,
static int minix_mkdir(struct inode * dir, struct dentry *dentry, umode_t mode)
{
struct inode * inode;
int err = -EMLINK;
if (dir->i_nlink >= minix_sb(dir->i_sb)->s_link_max)
goto out;
int err;
inode_inc_link_count(dir);
@ -181,7 +175,6 @@ static int minix_rmdir(struct inode * dir, struct dentry *dentry)
static int minix_rename(struct inode * old_dir, struct dentry *old_dentry,
struct inode * new_dir, struct dentry *new_dentry)
{
struct minix_sb_info * info = minix_sb(old_dir->i_sb);
struct inode * old_inode = old_dentry->d_inode;
struct inode * new_inode = new_dentry->d_inode;
struct page * dir_page = NULL;
@ -219,11 +212,6 @@ static int minix_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 >= info->s_link_max)
goto out_dir;
}
err = minix_add_link(new_dentry, old_inode);
if (err)
goto out_dir;