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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/udf/namei.c
View file

@ -32,8 +32,6 @@
#include <linux/crc-itu-t.h>
#include <linux/exportfs.h>
enum { UDF_MAX_LINKS = 0xffff };
static inline int udf_match(int len1, const unsigned char *name1, int len2,
const unsigned char *name2)
{
@ -649,10 +647,6 @@ static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
struct udf_inode_info *dinfo = UDF_I(dir);
struct udf_inode_info *iinfo;
err = -EMLINK;
if (dir->i_nlink >= UDF_MAX_LINKS)
goto out;
err = -EIO;
inode = udf_new_inode(dir, S_IFDIR | mode, &err);
if (!inode)
@ -1032,9 +1026,6 @@ static int udf_link(struct dentry *old_dentry, struct inode *dir,
struct fileIdentDesc cfi, *fi;
int err;
if (inode->i_nlink >= UDF_MAX_LINKS)
return -EMLINK;
fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
if (!fi) {
return err;
@ -1126,10 +1117,6 @@ static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
old_dir->i_ino)
goto end_rename;
retval = -EMLINK;
if (!new_inode && new_dir->i_nlink >= UDF_MAX_LINKS)
goto end_rename;
}
if (!nfi) {
nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,

3
fs/udf/super.c
View file

@ -75,6 +75,8 @@
#define UDF_DEFAULT_BLOCKSIZE 2048
enum { UDF_MAX_LINKS = 0xffff };
/* These are the "meat" - everything else is stuffing */
static int udf_fill_super(struct super_block *, void *, int);
static void udf_put_super(struct super_block *);
@ -2042,6 +2044,7 @@ static int udf_fill_super(struct super_block *sb, void *options, int silent)
goto error_out;
}
sb->s_maxbytes = MAX_LFS_FILESIZE;
sb->s_max_links = UDF_MAX_LINKS;
return 0;
error_out: