cregit-Linux how code gets into the kernel

Release 4.10 fs/ext2/acl.c

Directory: fs/ext2
 * linux/fs/ext2/acl.c
 * Copyright (C) 2001-2003 Andreas Gruenbacher, <>

#include <linux/init.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include "ext2.h"
#include "xattr.h"
#include "acl.h"

 * Convert from filesystem to in-memory representation.

static struct posix_acl * ext2_acl_from_disk(const void *value, size_t size) { const char *end = (char *)value + size; int n, count; struct posix_acl *acl; if (!value) return NULL; if (size < sizeof(ext2_acl_header)) return ERR_PTR(-EINVAL); if (((ext2_acl_header *)value)->a_version != cpu_to_le32(EXT2_ACL_VERSION)) return ERR_PTR(-EINVAL); value = (char *)value + sizeof(ext2_acl_header); count = ext2_acl_count(size); if (count < 0) return ERR_PTR(-EINVAL); if (count == 0) return NULL; acl = posix_acl_alloc(count, GFP_KERNEL); if (!acl) return ERR_PTR(-ENOMEM); for (n=0; n < count; n++) { ext2_acl_entry *entry = (ext2_acl_entry *)value; if ((char *)value + sizeof(ext2_acl_entry_short) > end) goto fail; acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag); acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm); switch(acl->a_entries[n].e_tag) { case ACL_USER_OBJ: case ACL_GROUP_OBJ: case ACL_MASK: case ACL_OTHER: value = (char *)value + sizeof(ext2_acl_entry_short); break; case ACL_USER: value = (char *)value + sizeof(ext2_acl_entry); if ((char *)value > end) goto fail; acl->a_entries[n].e_uid = make_kuid(&init_user_ns, le32_to_cpu(entry->e_id)); break; case ACL_GROUP: value = (char *)value + sizeof(ext2_acl_entry); if ((char *)value > end) goto fail; acl->a_entries[n].e_gid = make_kgid(&init_user_ns, le32_to_cpu(entry->e_id)); break; default: goto fail; } } if (value != end) goto fail; return acl; fail: posix_acl_release(acl); return ERR_PTR(-EINVAL); }


theodore tsotheodore tso34787.19%133.33%
eric w. biedermaneric w. biederman5012.56%133.33%
andrew mortonandrew morton10.25%133.33%

/* * Convert from in-memory to filesystem representation. */
static void * ext2_acl_to_disk(const struct posix_acl *acl, size_t *size) { ext2_acl_header *ext_acl; char *e; size_t n; *size = ext2_acl_size(acl->a_count); ext_acl = kmalloc(sizeof(ext2_acl_header) + acl->a_count * sizeof(ext2_acl_entry), GFP_KERNEL); if (!ext_acl) return ERR_PTR(-ENOMEM); ext_acl->a_version = cpu_to_le32(EXT2_ACL_VERSION); e = (char *)ext_acl + sizeof(ext2_acl_header); for (n=0; n < acl->a_count; n++) { const struct posix_acl_entry *acl_e = &acl->a_entries[n]; ext2_acl_entry *entry = (ext2_acl_entry *)e; entry->e_tag = cpu_to_le16(acl_e->e_tag); entry->e_perm = cpu_to_le16(acl_e->e_perm); switch(acl_e->e_tag) { case ACL_USER: entry->e_id = cpu_to_le32( from_kuid(&init_user_ns, acl_e->e_uid)); e += sizeof(ext2_acl_entry); break; case ACL_GROUP: entry->e_id = cpu_to_le32( from_kgid(&init_user_ns, acl_e->e_gid)); e += sizeof(ext2_acl_entry); break; case ACL_USER_OBJ: case ACL_GROUP_OBJ: case ACL_MASK: case ACL_OTHER: e += sizeof(ext2_acl_entry_short); break; default: goto fail; } } return (char *)ext_acl; fail: kfree(ext_acl); return ERR_PTR(-EINVAL); }


theodore tsotheodore tso21480.75%133.33%
eric w. biedermaneric w. biederman5018.87%133.33%
andrew mortonandrew morton10.38%133.33%

/* * inode->i_mutex: don't care */
struct posix_acl * ext2_get_acl(struct inode *inode, int type) { int name_index; char *value = NULL; struct posix_acl *acl; int retval; switch (type) { case ACL_TYPE_ACCESS: name_index = EXT2_XATTR_INDEX_POSIX_ACL_ACCESS; break; case ACL_TYPE_DEFAULT: name_index = EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT; break; default: BUG(); } retval = ext2_xattr_get(inode, name_index, "", NULL, 0); if (retval > 0) { value = kmalloc(retval, GFP_KERNEL); if (!value) return ERR_PTR(-ENOMEM); retval = ext2_xattr_get(inode, name_index, "", value, retval); } if (retval > 0) acl = ext2_acl_from_disk(value, retval); else if (retval == -ENODATA || retval == -ENOSYS) acl = NULL; else acl = ERR_PTR(retval); kfree(value); return acl; }


theodore tsotheodore tso9859.39%125.00%
andrew mortonandrew morton5633.94%250.00%
al viroal viro116.67%125.00%

/* * inode->i_mutex: down */
int ext2_set_acl(struct inode *inode, struct posix_acl *acl, int type) { int name_index; void *value = NULL; size_t size = 0; int error; switch(type) { case ACL_TYPE_ACCESS: name_index = EXT2_XATTR_INDEX_POSIX_ACL_ACCESS; if (acl) { error = posix_acl_update_mode(inode, &inode->i_mode, &acl); if (error) return error; inode->i_ctime = current_time(inode); mark_inode_dirty(inode); } break; case ACL_TYPE_DEFAULT: name_index = EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT; if (!S_ISDIR(inode->i_mode)) return acl ? -EACCES : 0; break; default: return -EINVAL; } if (acl) { value = ext2_acl_to_disk(acl, &size); if (IS_ERR(value)) return (int)PTR_ERR(value); } error = ext2_xattr_set(inode, name_index, "", value, size, 0); kfree(value); if (!error) set_cached_acl(inode, type, acl); return error; }


theodore tsotheodore tso16484.97%110.00%
jan karajan kara84.15%220.00%
andrew mortonandrew morton73.63%220.00%
al viroal viro52.59%220.00%
deepa dinamanideepa dinamani42.07%110.00%
christoph hellwigchristoph hellwig31.55%110.00%
andreas gruenbacherandreas gruenbacher21.04%110.00%

/* * Initialize the ACLs of a new inode. Called from ext2_new_inode. * * dir->i_mutex: down * inode->i_mutex: up (access to inode is still exclusive) */
int ext2_init_acl(struct inode *inode, struct inode *dir) { struct posix_acl *default_acl, *acl; int error; error = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl); if (error) return error; if (default_acl) { error = ext2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT); posix_acl_release(default_acl); } if (acl) { if (!error) error = ext2_set_acl(inode, acl, ACL_TYPE_ACCESS); posix_acl_release(acl); } return error; }


theodore tsotheodore tso7471.84%125.00%
christoph hellwigchristoph hellwig2221.36%125.00%
al viroal viro76.80%250.00%

Overall Contributors

theodore tsotheodore tso92079.93%16.25%
eric w. biedermaneric w. biederman1008.69%16.25%
andrew mortonandrew morton665.73%425.00%
christoph hellwigchristoph hellwig252.17%16.25%
al viroal viro232.00%425.00%
jan karajan kara80.70%212.50%
deepa dinamanideepa dinamani40.35%16.25%
jes sorensenjes sorensen30.26%16.25%
andreas gruenbacherandreas gruenbacher20.17%16.25%
Directory: fs/ext2
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.