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shm: fix the filename of hugetlb sysv shared memory

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Some user space tools need to identify SYSV shared memory when examining
/proc/<pid>/maps.  To do so they look for a block device with major zero, a
dentry named SYSV<sysv key>, and having the minor of the internal sysv
shared memory kernel mount.

To help these tools and to make it easier for people just browsing
/proc/<pid>/maps this patch modifies hugetlb sysv shared memory to use the
SYSV<key> dentry naming convention.

User space tools will still have to be aware that hugetlb sysv shared
memory lives on a different internal kernel mount and so has a different
block device minor number from the rest of sysv shared memory.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Cc: "Serge E. Hallyn" <serge@hallyn.com>
Cc: Albert Cahalan <acahalan@gmail.com>
Cc: Badari Pulavarty <pbadari@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Eric W. Biederman 2007-06-16 10:16:16 -07:00 • committed by Linus Torvalds
parent 22741925d2
commit 9d66586f77
3 changed files with 7 additions and 10 deletions
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7
fs/hugetlbfs/inode.c
View file

@ -736,15 +736,13 @@ static int can_do_hugetlb_shm(void)
can_do_mlock());
}
struct file *hugetlb_zero_setup(size_t size)
struct file *hugetlb_file_setup(const char *name, size_t size)
{
int error = -ENOMEM;
struct file *file;
struct inode *inode;
struct dentry *dentry, *root;
struct qstr quick_string;
char buf[16];
static atomic_t counter;
if (!hugetlbfs_vfsmount)
return ERR_PTR(-ENOENT);
@ -756,8 +754,7 @@ struct file *hugetlb_zero_setup(size_t size)
return ERR_PTR(-ENOMEM);
root = hugetlbfs_vfsmount->mnt_root;
snprintf(buf, 16, "%u", atomic_inc_return(&counter));
quick_string.name = buf;
quick_string.name = name;
quick_string.len = strlen(quick_string.name);
quick_string.hash = 0;
dentry = d_alloc(root, &quick_string);