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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 <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2012-02-06 12:45:27 -05:00
parent c16fa4f2ad
commit 8de5277879
26 changed files with 46 additions and 149 deletions
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13
fs/exofs/namei.c
View File

@@ -143,9 +143,6 @@ static int exofs_link(struct dentry *old_dentry, struct inode *dir,
{
struct inode *inode = old_dentry->d_inode;
if (inode->i_nlink >= EXOFS_LINK_MAX)
return -EMLINK;
inode->i_ctime = CURRENT_TIME;
inode_inc_link_count(inode);
ihold(inode);
@@ -156,10 +153,7 @@ static int exofs_link(struct dentry *old_dentry, struct inode *dir,
static int exofs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
{
struct inode *inode;
int err = -EMLINK;
if (dir->i_nlink >= EXOFS_LINK_MAX)
goto out;
int err;
inode_inc_link_count(dir);
@@ -275,11 +269,6 @@ static int exofs_rename(struct inode *old_dir, struct dentry *old_dentry,
if (err)
goto out_dir;
} else {
if (dir_de) {
err = -EMLINK;
if (new_dir->i_nlink >= EXOFS_LINK_MAX)
goto out_dir;
}
err = exofs_add_link(new_dentry, old_inode);
if (err)
goto out_dir;

1
fs/exofs/super.c
View File

@@ -754,6 +754,7 @@ static int exofs_fill_super(struct super_block *sb, void *data, int silent)
sb->s_blocksize = EXOFS_BLKSIZE;
sb->s_blocksize_bits = EXOFS_BLKSHIFT;
sb->s_maxbytes = MAX_LFS_FILESIZE;
sb->s_max_links = EXOFS_LINK_MAX;
atomic_set(&sbi->s_curr_pending, 0);
sb->s_bdev = NULL;
sb->s_dev = 0;