#include <ext2fs.h>
#include <linux/module.h>
#include <linux/ext4_xattr.h>

Include dependency graph for ext4_xattr.c:

Classes
struct	xattr_prefix

Macros
#define	NAME_HASH_SHIFT 5

#define	VALUE_HASH_SHIFT 16

#define	BLOCK_HASH_SHIFT 16

#define	ext4_xattr_block_checksum(...) 0

Functions
static ext4_fsblk_t	ext4_new_meta_blocks (void icb, struct inode inode, ext4_fsblk_t goal, unsigned int flags, unsigned long count, int errp)

static void	ext4_free_blocks (void icb, struct inode inode, ext4_fsblk_t block, int count, int flags)

static ext4_fsblk_t	ext4_inode_to_goal_block (struct inode *inode)

static void	ext4_xattr_compute_hash (struct ext4_xattr_header header, struct ext4_xattr_entry entry)

static void	ext4_xattr_rehash (struct ext4_xattr_header header, struct ext4_xattr_entry entry)

static void	ext4_xattr_set_block_checksum (PEXT2_MCB inode_ref, ext4_fsblk_t blocknr, struct ext4_xattr_header *header)

static int	ext4_xattr_item_cmp (struct rb_node _a, struct rb_node _b)

static struct ext4_xattr_item *	ext4_xattr_item_search (struct ext4_xattr_ref xattr_ref, struct ext4_xattr_item name)

static void	ext4_xattr_item_insert (struct ext4_xattr_ref xattr_ref, struct ext4_xattr_item item)

static void	ext4_xattr_item_remove (struct ext4_xattr_ref xattr_ref, struct ext4_xattr_item item)

static struct ext4_xattr_item *	ext4_xattr_item_alloc (__u8 name_index, const char *name, size_t name_len)

static int	ext4_xattr_item_alloc_data (struct ext4_xattr_item item, const void orig_data, size_t data_size)

static void	ext4_xattr_item_free_data (struct ext4_xattr_item *item)

static int	ext4_xattr_item_resize_data (struct ext4_xattr_item *item, size_t new_data_size)

static void	ext4_xattr_item_free (struct ext4_xattr_item *item)

static void *	ext4_xattr_entry_data (struct ext4_xattr_ref xattr_ref, struct ext4_xattr_entry entry, BOOL in_inode)

static int	ext4_xattr_block_fetch (struct ext4_xattr_ref *xattr_ref)

static int	ext4_xattr_inode_fetch (struct ext4_xattr_ref *xattr_ref)

static __s32	ext4_xattr_inode_space (struct ext4_xattr_ref *xattr_ref)

static __s32	ext4_xattr_block_space (struct ext4_xattr_ref *xattr_ref)

static int	ext4_xattr_fetch (struct ext4_xattr_ref *xattr_ref)

static struct ext4_xattr_item *	ext4_xattr_lookup_item (struct ext4_xattr_ref xattr_ref, __u8 name_index, const char name, size_t name_len)

static struct ext4_xattr_item *	ext4_xattr_insert_item (struct ext4_xattr_ref xattr_ref, __u8 name_index, const char name, size_t name_len, const void data, size_t data_size, int err)

static struct ext4_xattr_item *	ext4_xattr_insert_item_ordered (struct ext4_xattr_ref xattr_ref, __u8 name_index, const char name, size_t name_len, const void data, size_t data_size, int err)

static int	ext4_xattr_remove_item (struct ext4_xattr_ref xattr_ref, __u8 name_index, const char name, size_t name_len)

static int	ext4_xattr_resize_item (struct ext4_xattr_ref xattr_ref, struct ext4_xattr_item item, size_t new_data_size)

void	ext4_xattr_purge_items (struct ext4_xattr_ref *xattr_ref)

static int	ext4_xattr_try_alloc_block (struct ext4_xattr_ref *xattr_ref)

static void	ext4_xattr_try_free_block (struct ext4_xattr_ref *xattr_ref)

static void	ext4_xattr_set_block_header (struct ext4_xattr_ref *xattr_ref)

static void	ext4_xattr_set_inode_entry (struct ext4_xattr_item item, struct ext4_xattr_ibody_header ibody_header, struct ext4_xattr_entry entry, void ibody_data_ptr)

static void	ext4_xattr_set_block_entry (struct ext4_xattr_item item, struct ext4_xattr_header block_header, struct ext4_xattr_entry block_entry, void block_data_ptr)

static int	ext4_xattr_write_to_disk (struct ext4_xattr_ref *xattr_ref)

void	ext4_fs_xattr_iterate (struct ext4_xattr_ref ref, int(iter)(struct ext4_xattr_ref ref, struct ext4_xattr_item item, BOOL is_last))

void	ext4_fs_xattr_iterate_reset (struct ext4_xattr_ref *ref)

int	ext4_fs_set_xattr (struct ext4_xattr_ref ref, __u8 name_index, const char name, size_t name_len, const void *data, size_t data_size, BOOL replace)

int	ext4_fs_set_xattr_ordered (struct ext4_xattr_ref ref, __u8 name_index, const char name, size_t name_len, const void *data, size_t data_size)

int	ext4_fs_remove_xattr (struct ext4_xattr_ref ref, __u8 name_index, const char name, size_t name_len)

int	ext4_fs_get_xattr (struct ext4_xattr_ref ref, __u8 name_index, const char name, size_t name_len, void buf, size_t buf_size, size_t data_size)

int	ext4_fs_get_xattr_ref (PEXT2_IRP_CONTEXT IrpContext, PEXT2_VCB fs, PEXT2_MCB inode_ref, struct ext4_xattr_ref *ref)

int	ext4_fs_put_xattr_ref (struct ext4_xattr_ref *ref)

const char *	ext4_extract_xattr_name (const char full_name, size_t full_name_len, __u8 name_index, size_t name_len, BOOL found)

const char *	ext4_get_xattr_name_prefix (__u8 name_index, size_t *ret_prefix_len)

Variables
static const struct xattr_prefix	prefix_tbl []

Macro Definition Documentation

◆ BLOCK_HASH_SHIFT

#define BLOCK_HASH_SHIFT 16

Definition at line 89 of file ext4_xattr.c.

◆ ext4_xattr_block_checksum

#define ext4_xattr_block_checksum ( ... ) 0

Definition at line 149 of file ext4_xattr.c.

◆ NAME_HASH_SHIFT

#define NAME_HASH_SHIFT 5

Definition at line 60 of file ext4_xattr.c.

◆ VALUE_HASH_SHIFT

#define VALUE_HASH_SHIFT 16

Definition at line 61 of file ext4_xattr.c.

Function Documentation

◆ ext4_free_blocks()

static void ext4_free_blocks	(	void *	icb,
		struct inode *	inode,
		ext4_fsblk_t	block,
		int	count,
		int	flags
	)

static

Definition at line 45 of file ext4_xattr.c.

 {
     Ext2FreeBlock((PEXT2_IRP_CONTEXT)icb, inode->i_sb->s_priv, (ULONG)block, count);
     inode->i_blocks -= count * (inode->i_sb->s_blocksize >> 9);
     return;
 }

Referenced by ext4_xattr_try_alloc_block(), and ext4_xattr_try_free_block().

◆ ext4_inode_to_goal_block()

static ext4_fsblk_t ext4_inode_to_goal_block ( struct inode * inode )

inlinestatic

Definition at line 53 of file ext4_xattr.c.

 {
     PEXT2_VCB Vcb;
     Vcb = inode->i_sb->s_priv;
     return (inode->i_ino - 1) / BLOCKS_PER_GROUP;
 }

Referenced by ext4_xattr_try_alloc_block().

◆ ext4_new_meta_blocks()

static ext4_fsblk_t ext4_new_meta_blocks	(	void *	icb,
		struct inode *	inode,
		ext4_fsblk_t	goal,
		unsigned int	flags,
		unsigned long *	count,
		int *	errp
	)

static

Definition at line 20 of file ext4_xattr.c.

 {
     NTSTATUS status;
     ULONG blockcnt = (count) ? *count : 1;
     ULONG block = 0;
 
     status = Ext2NewBlock((PEXT2_IRP_CONTEXT)icb,
         inode->i_sb->s_priv,
         0, (ULONG)goal,
         &block,
         &blockcnt);
     if (count)
         *count = blockcnt;
 
     if (!NT_SUCCESS(status)) {
         *errp = Ext2LinuxError(status);
         return 0;
     }
     inode->i_blocks += (blockcnt * (inode->i_sb->s_blocksize >> 9));
     return block;
 }

Referenced by ext4_xattr_try_alloc_block().

◆ ext4_xattr_block_fetch()

static int ext4_xattr_block_fetch ( struct ext4_xattr_ref * xattr_ref )

static

Definition at line 338 of file ext4_xattr.c.

 {
     int ret = 0;
     size_t size_rem;
     void *data;
     struct ext4_xattr_entry *entry = NULL;
 
     ASSERT(xattr_ref->block_bh->b_data);
     entry = EXT4_XATTR_BFIRST(xattr_ref->block_bh);
 
     size_rem = xattr_ref->fs->BlockSize;
     for (; size_rem > 0 && !EXT4_XATTR_IS_LAST_ENTRY(entry);
          entry = EXT4_XATTR_NEXT(entry),
          size_rem -= EXT4_XATTR_LEN(entry->e_name_len)) {
         struct ext4_xattr_item *item;
         char *e_name = EXT4_XATTR_NAME(entry);
 
         data = ext4_xattr_entry_data(xattr_ref, entry, FALSE);
         if (!data) {
             ret = -EIO;
             goto Finish;
         }
 
         item = ext4_xattr_item_alloc(entry->e_name_index, e_name,
                          (size_t)entry->e_name_len);
         if (!item) {
             ret = -ENOMEM;
             goto Finish;
         }
         if (ext4_xattr_item_alloc_data(
             item, data, le32_to_cpu(entry->e_value_size)) != 0) {
             ext4_xattr_item_free(item);
             ret = -ENOMEM;
             goto Finish;
         }
         ext4_xattr_item_insert(xattr_ref, item);
         xattr_ref->block_size_rem -=
             EXT4_XATTR_SIZE(item->data_size) +
             EXT4_XATTR_LEN(item->name_len);
         xattr_ref->ea_size += EXT4_XATTR_SIZE(item->data_size) +
                       EXT4_XATTR_LEN(item->name_len);
     }
 
 Finish:
     return ret;
 }

Referenced by ext4_xattr_fetch().

◆ ext4_xattr_block_space()

static __s32 ext4_xattr_block_space ( struct ext4_xattr_ref * xattr_ref )

static

Definition at line 444 of file ext4_xattr.c.

 {
     return xattr_ref->fs->BlockSize;
 }

Referenced by ext4_fs_get_xattr_ref(), ext4_xattr_purge_items(), and ext4_xattr_write_to_disk().

◆ ext4_xattr_compute_hash()

static void ext4_xattr_compute_hash	(	struct ext4_xattr_header *	header,
		struct ext4_xattr_entry *	entry
	)

inlinestatic

Definition at line 63 of file ext4_xattr.c.

 {
     __u32 hash = 0;
     char *name = EXT4_XATTR_NAME(entry);
     int n;
 
     for (n = 0; n < entry->e_name_len; n++) {
         hash = (hash << NAME_HASH_SHIFT) ^
                (hash >> (8 * sizeof(hash) - NAME_HASH_SHIFT)) ^ *name++;
     }
 
     if (entry->e_value_block == 0 && entry->e_value_size != 0) {
         __le32 *value =
             (__le32 *)((char *)header + le16_to_cpu(entry->e_value_offs));
         for (n = (le32_to_cpu(entry->e_value_size) + EXT4_XATTR_ROUND) >>
              EXT4_XATTR_PAD_BITS;
              n; n--) {
             hash = (hash << VALUE_HASH_SHIFT) ^
                    (hash >> (8 * sizeof(hash) - VALUE_HASH_SHIFT)) ^
                    le32_to_cpu(*value++);
         }
     }
     entry->e_hash = cpu_to_le32(hash);
 }

Referenced by ext4_xattr_rehash(), and ext4_xattr_write_to_disk().

◆ ext4_xattr_entry_data()

static void* ext4_xattr_entry_data	(	struct ext4_xattr_ref *	xattr_ref,
		struct ext4_xattr_entry *	entry,
		BOOL	in_inode
	)

static

Definition at line 309 of file ext4_xattr.c.

 {
     char *ret;
     int block_size;
     if (in_inode) {
         struct ext4_xattr_ibody_header *header;
         struct ext4_xattr_entry *first_entry;
         int inode_size = xattr_ref->fs->InodeSize;
         header = EXT4_XATTR_IHDR(xattr_ref->OnDiskInode);
         first_entry = EXT4_XATTR_IFIRST(header);
 
         ret = ((char *)first_entry + le16_to_cpu(entry->e_value_offs));
         if (ret + EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) -
             (char *)xattr_ref->OnDiskInode > inode_size)
             ret = NULL;
 
         return ret;
 
     }
     block_size = xattr_ref->fs->BlockSize;
     ret = ((char *)xattr_ref->block_bh->b_data + le16_to_cpu(entry->e_value_offs));
     if (ret + EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) -
             (char *)xattr_ref->block_bh->b_data > block_size)
         ret = NULL;
     return ret;
 }

Referenced by ext4_xattr_block_fetch(), and ext4_xattr_inode_fetch().

◆ ext4_xattr_fetch()

static int ext4_xattr_fetch ( struct ext4_xattr_ref * xattr_ref )

static

Definition at line 449 of file ext4_xattr.c.

 {
     int ret = 0;
     int inode_size = xattr_ref->fs->InodeSize;
     if (inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
         ret = ext4_xattr_inode_fetch(xattr_ref);
         if (ret != 0)
             return ret;
     }
 
     if (xattr_ref->block_loaded)
         ret = ext4_xattr_block_fetch(xattr_ref);
 
     xattr_ref->dirty = FALSE;
     return ret;
 }

Referenced by ext4_fs_get_xattr_ref().

◆ ext4_xattr_inode_fetch()

static int ext4_xattr_inode_fetch ( struct ext4_xattr_ref * xattr_ref )

static

Definition at line 385 of file ext4_xattr.c.

 {
     void *data;
     size_t size_rem;
     int ret = 0;
     struct ext4_xattr_ibody_header *header = NULL;
     struct ext4_xattr_entry *entry = NULL;
     int inode_size = xattr_ref->fs->InodeSize;
 
     header = EXT4_XATTR_IHDR(xattr_ref->OnDiskInode);
     entry = EXT4_XATTR_IFIRST(header);
 
     size_rem = inode_size - EXT4_GOOD_OLD_INODE_SIZE -
            xattr_ref->OnDiskInode->i_extra_isize;
     for (; size_rem > 0 && !EXT4_XATTR_IS_LAST_ENTRY(entry);
          entry = EXT4_XATTR_NEXT(entry),
          size_rem -= EXT4_XATTR_LEN(entry->e_name_len)) {
         struct ext4_xattr_item *item;
         char *e_name = EXT4_XATTR_NAME(entry);
 
         data = ext4_xattr_entry_data(xattr_ref, entry, TRUE);
         if (!data) {
             ret = -EIO;
             goto Finish;
         }
 
         item = ext4_xattr_item_alloc(entry->e_name_index, e_name,
                          (size_t)entry->e_name_len);
         if (!item) {
             ret = -ENOMEM;
             goto Finish;
         }
         if (ext4_xattr_item_alloc_data(
             item, data, le32_to_cpu(entry->e_value_size)) != 0) {
             ext4_xattr_item_free(item);
             ret = -ENOMEM;
             goto Finish;
         }
         item->in_inode = TRUE;
         ext4_xattr_item_insert(xattr_ref, item);
         xattr_ref->inode_size_rem -=
             EXT4_XATTR_SIZE(item->data_size) +
             EXT4_XATTR_LEN(item->name_len);
         xattr_ref->ea_size += EXT4_XATTR_SIZE(item->data_size) +
                       EXT4_XATTR_LEN(item->name_len);
     }
 
 Finish:
     return ret;
 }

Referenced by ext4_xattr_fetch().

◆ ext4_xattr_inode_space()

static __s32 ext4_xattr_inode_space ( struct ext4_xattr_ref * xattr_ref )

static

Definition at line 436 of file ext4_xattr.c.

 {
     int inode_size = xattr_ref->fs->InodeSize;
     int size_rem = inode_size - EXT4_GOOD_OLD_INODE_SIZE -
                 xattr_ref->OnDiskInode->i_extra_isize;
     return size_rem;
 }

Referenced by ext4_fs_get_xattr_ref(), ext4_xattr_purge_items(), and ext4_xattr_write_to_disk().

◆ ext4_xattr_insert_item()

static struct ext4_xattr_item* ext4_xattr_insert_item	(	struct ext4_xattr_ref *	xattr_ref,
		__u8	name_index,
		const char *	name,
		size_t	name_len,
		const void *	data,
		size_t	data_size,
		int *	err
	)

static

Definition at line 486 of file ext4_xattr.c.

 {
     struct ext4_xattr_item *item;
     item = ext4_xattr_item_alloc(name_index, name, name_len);
     if (!item) {
         if (err)
             *err = -ENOMEM;
 
         return NULL;
     }
 
     item->in_inode = TRUE;
     if (xattr_ref->inode_size_rem <
        EXT4_XATTR_SIZE(data_size) +
        EXT4_XATTR_LEN(item->name_len)) {
         if (xattr_ref->block_size_rem <
            EXT4_XATTR_SIZE(data_size) +
            EXT4_XATTR_LEN(item->name_len)) {
             if (err)
                 *err = -ENOSPC;
 
             return NULL;
         }
 
         item->in_inode = FALSE;
     }
     if (ext4_xattr_item_alloc_data(item, data, data_size) != 0) {
         ext4_xattr_item_free(item);
         if (err)
             *err = -ENOMEM;
 
         return NULL;
     }
     ext4_xattr_item_insert(xattr_ref, item);
     xattr_ref->ea_size +=
         EXT4_XATTR_SIZE(item->data_size) + EXT4_XATTR_LEN(item->name_len);
     if (item->in_inode) {
         xattr_ref->inode_size_rem -=
             EXT4_XATTR_SIZE(item->data_size) +
             EXT4_XATTR_LEN(item->name_len);
     } else {
         xattr_ref->block_size_rem -=
             EXT4_XATTR_SIZE(item->data_size) +
             EXT4_XATTR_LEN(item->name_len);
     }
     xattr_ref->dirty = TRUE;
     if (err)
         *err = 0;
 
     return item;
 }

Referenced by ext4_fs_set_xattr().

◆ ext4_xattr_insert_item_ordered()

static struct ext4_xattr_item* ext4_xattr_insert_item_ordered	(	struct ext4_xattr_ref *	xattr_ref,
		__u8	name_index,
		const char *	name,
		size_t	name_len,
		const void *	data,
		size_t	data_size,
		int *	err
	)

static

Definition at line 542 of file ext4_xattr.c.

 {
     struct ext4_xattr_item *item, *last_item = NULL;
     item = ext4_xattr_item_alloc(name_index, name, name_len);
     if (!item) {
         if (err)
             *err = -ENOMEM;
 
         return NULL;
     }
 
     if (!list_empty(&xattr_ref->ordered_list))
         last_item = list_entry(xattr_ref->ordered_list.prev,
                     struct ext4_xattr_item,
                     list_node);
 
     item->in_inode = TRUE;
     if ((xattr_ref->inode_size_rem <
         EXT4_XATTR_SIZE(data_size) +
         EXT4_XATTR_LEN(item->name_len))
             ||
         (last_item && !last_item->in_inode)) {
         if (xattr_ref->block_size_rem <
             EXT4_XATTR_SIZE(data_size) +
             EXT4_XATTR_LEN(item->name_len)) {
             if (err)
                 *err = -ENOSPC;
 
             return NULL;
         }
 
         item->in_inode = FALSE;
     }
     if (ext4_xattr_item_alloc_data(item, data, data_size) != 0) {
         ext4_xattr_item_free(item);
         if (err)
             *err = -ENOMEM;
 
         return NULL;
     }
     ext4_xattr_item_insert(xattr_ref, item);
     xattr_ref->ea_size +=
         EXT4_XATTR_SIZE(item->data_size) + EXT4_XATTR_LEN(item->name_len);
     if (item->in_inode) {
         xattr_ref->inode_size_rem -=
             EXT4_XATTR_SIZE(item->data_size) +
             EXT4_XATTR_LEN(item->name_len);
     }
     else {
         xattr_ref->block_size_rem -=
             EXT4_XATTR_SIZE(item->data_size) +
             EXT4_XATTR_LEN(item->name_len);
     }
     xattr_ref->dirty = TRUE;
     if (err)
         *err = 0;
 
     return item;
 }

Referenced by ext4_fs_set_xattr_ordered().

◆ ext4_xattr_item_alloc()

static struct ext4_xattr_item* ext4_xattr_item_alloc	(	__u8	name_index,
		const char *	name,
		size_t	name_len
	)

static

Definition at line 232 of file ext4_xattr.c.

 {
     struct ext4_xattr_item *item;
     item = kzalloc(sizeof(struct ext4_xattr_item) + name_len, GFP_NOFS);
     if (!item)
         return NULL;
 
     item->name_index = name_index;
     item->name = (char *)(item + 1);
     item->name_len = name_len;
     item->data = NULL;
     item->data_size = 0;
     INIT_LIST_HEAD(&item->list_node);
 
     memcpy(item->name, name, name_len);
 
     if (name_index == EXT4_XATTR_INDEX_SYSTEM &&
         name_len == 4 &&
         !memcmp(name, "data", 4))
         item->is_data = TRUE;
     else
         item->is_data = FALSE;
 
     return item;
 }

Referenced by ext4_xattr_block_fetch(), ext4_xattr_inode_fetch(), ext4_xattr_insert_item(), and ext4_xattr_insert_item_ordered().

◆ ext4_xattr_item_alloc_data()

static int ext4_xattr_item_alloc_data	(	struct ext4_xattr_item *	item,
		const void *	orig_data,
		size_t	data_size
	)

static

Definition at line 258 of file ext4_xattr.c.

 {
     void *data = NULL;
     ASSERT(!item->data);
     data = kmalloc(data_size, GFP_NOFS);
     if (!data)
         return -ENOMEM;
 
     if (orig_data)
         memcpy(data, orig_data, data_size);
 
     item->data = data;
     item->data_size = data_size;
     return 0;
 }

Referenced by ext4_xattr_block_fetch(), ext4_xattr_inode_fetch(), ext4_xattr_insert_item(), and ext4_xattr_insert_item_ordered().

◆ ext4_xattr_item_cmp()

static int ext4_xattr_item_cmp	(	struct rb_node *	_a,
		struct rb_node *	_b
	)

static

Definition at line 161 of file ext4_xattr.c.

 {
     int result;
     struct ext4_xattr_item *a, *b;
     a = container_of(_a, struct ext4_xattr_item, node);
     a = container_of(_a, struct ext4_xattr_item, node);
     b = container_of(_b, struct ext4_xattr_item, node);
 
     if (a->is_data && !b->is_data)
         return -1;
 
     if (!a->is_data && b->is_data)
         return 1;
 
     result = a->name_index - b->name_index;
     if (result)
         return result;
 
     if (a->name_len < b->name_len)
         return -1;
 
     if (a->name_len > b->name_len)
         return 1;
 
     return memcmp(a->name, b->name, a->name_len);
 }

Referenced by ext4_xattr_item_insert(), and ext4_xattr_item_search().

◆ ext4_xattr_item_free()

static void ext4_xattr_item_free ( struct ext4_xattr_item * item )

static

Definition at line 301 of file ext4_xattr.c.

 {
     if (item->data)
         ext4_xattr_item_free_data(item);
 
     kfree(item);
 }

Referenced by ext4_xattr_block_fetch(), ext4_xattr_inode_fetch(), ext4_xattr_insert_item(), ext4_xattr_insert_item_ordered(), ext4_xattr_purge_items(), and ext4_xattr_remove_item().

◆ ext4_xattr_item_free_data()

static void ext4_xattr_item_free_data ( struct ext4_xattr_item * item )

static

Definition at line 275 of file ext4_xattr.c.

 {
     ASSERT(item->data);
     kfree(item->data);
     item->data = NULL;
     item->data_size = 0;
 }

Referenced by ext4_xattr_item_free().

◆ ext4_xattr_item_insert()

static void ext4_xattr_item_insert	(	struct ext4_xattr_ref *	xattr_ref,
		struct ext4_xattr_item *	item
	)

static

Definition at line 216 of file ext4_xattr.c.

 {
     rb_insert(&xattr_ref->root, &item->node,
           ext4_xattr_item_cmp);
     list_add_tail(&item->list_node, &xattr_ref->ordered_list);
 }

Referenced by ext4_xattr_block_fetch(), ext4_xattr_inode_fetch(), ext4_xattr_insert_item(), and ext4_xattr_insert_item_ordered().

◆ ext4_xattr_item_remove()

static void ext4_xattr_item_remove	(	struct ext4_xattr_ref *	xattr_ref,
		struct ext4_xattr_item *	item
	)

static

Definition at line 224 of file ext4_xattr.c.

 {
     rb_erase(&item->node, &xattr_ref->root);
     list_del_init(&item->list_node);
 }

Referenced by ext4_xattr_purge_items(), and ext4_xattr_remove_item().

◆ ext4_xattr_item_resize_data()

static int ext4_xattr_item_resize_data	(	struct ext4_xattr_item *	item,
		size_t	new_data_size
	)

static

Definition at line 283 of file ext4_xattr.c.

 {
     if (new_data_size != item->data_size) {
         void *new_data;
         new_data = kmalloc(new_data_size, GFP_NOFS);
         if (!new_data)
             return -ENOMEM;
 
         memcpy(new_data, item->data, item->data_size);
         kfree(item->data);
 
         item->data = new_data;
         item->data_size = new_data_size;
     }
     return 0;
 }

Referenced by ext4_xattr_resize_item().

◆ ext4_xattr_item_search()

static struct ext4_xattr_item* ext4_xattr_item_search	(	struct ext4_xattr_ref *	xattr_ref,
		struct ext4_xattr_item *	name
	)

static

Definition at line 194 of file ext4_xattr.c.

 {
     struct rb_node *new = xattr_ref->root.rb_node;
 
     while (new) {
         struct ext4_xattr_item *node =
             container_of(new, struct ext4_xattr_item, node);
         int result = ext4_xattr_item_cmp(&name->node, new);
 
         if (result < 0)
             new = new->rb_left;
         else if (result > 0)
             new = new->rb_right;
         else
             return node;
 
     }
 
     return NULL;
 }

Referenced by ext4_xattr_lookup_item().

◆ ext4_xattr_lookup_item()

static struct ext4_xattr_item* ext4_xattr_lookup_item	(	struct ext4_xattr_ref *	xattr_ref,
		__u8	name_index,
		const char *	name,
		size_t	name_len
	)

static

Definition at line 467 of file ext4_xattr.c.

 {
     struct ext4_xattr_item tmp = {
         FALSE,
         FALSE,
         name_index,
         (char *)name, /*won't touch this string*/
         name_len,
     };
     if (name_index == EXT4_XATTR_INDEX_SYSTEM &&
         name_len == 4 &&
         !memcmp(name, "data", 4))
         tmp.is_data = TRUE;
 
     return ext4_xattr_item_search(xattr_ref, &tmp);
 }

Referenced by ext4_fs_get_xattr(), ext4_fs_set_xattr(), ext4_fs_set_xattr_ordered(), and ext4_xattr_remove_item().

◆ ext4_xattr_rehash()

static void ext4_xattr_rehash	(	struct ext4_xattr_header *	header,
		struct ext4_xattr_entry *	entry
	)

static

Definition at line 96 of file ext4_xattr.c.

 {
     struct ext4_xattr_entry *here;
     __u32 hash = 0;
 
     ext4_xattr_compute_hash(header, entry);
     here = EXT4_XATTR_ENTRY(header + 1);
     while (!EXT4_XATTR_IS_LAST_ENTRY(here)) {
         if (!here->e_hash) {
             /* Block is not shared if an entry's hash value == 0 */
             hash = 0;
             break;
         }
         hash = (hash << BLOCK_HASH_SHIFT) ^
                (hash >> (8 * sizeof(hash) - BLOCK_HASH_SHIFT)) ^
                le32_to_cpu(here->e_hash);
         here = EXT4_XATTR_NEXT(here);
     }
     header->h_hash = cpu_to_le32(hash);
 }

Referenced by ext4_xattr_write_to_disk().

◆ ext4_xattr_remove_item()

static int ext4_xattr_remove_item	(	struct ext4_xattr_ref *	xattr_ref,
		__u8	name_index,
		const char *	name,
		size_t	name_len
	)

static

Definition at line 605 of file ext4_xattr.c.

 {
     int ret = -ENOENT;
     struct ext4_xattr_item *item =
         ext4_xattr_lookup_item(xattr_ref, name_index, name, name_len);
     if (item) {
         if (item == xattr_ref->iter_from) {
             struct rb_node *next_node;
             next_node = rb_next(&item->node);
             if (next_node)
                 xattr_ref->iter_from =
                     container_of(next_node,
                              struct ext4_xattr_item,
                              node);
             else
                 xattr_ref->iter_from = NULL;
         }
 
         xattr_ref->ea_size -= EXT4_XATTR_SIZE(item->data_size) +
                       EXT4_XATTR_LEN(item->name_len);
 
         if (item->in_inode) {
             xattr_ref->inode_size_rem +=
                 EXT4_XATTR_SIZE(item->data_size) +
                 EXT4_XATTR_LEN(item->name_len);
         } else {
             xattr_ref->block_size_rem +=
                 EXT4_XATTR_SIZE(item->data_size) +
                 EXT4_XATTR_LEN(item->name_len);
         }
 
         ext4_xattr_item_remove(xattr_ref, item);
         ext4_xattr_item_free(item);
         xattr_ref->dirty = TRUE;
         ret = 0;
     }
     return ret;
 }

Referenced by ext4_fs_remove_xattr().

◆ ext4_xattr_resize_item()

static int ext4_xattr_resize_item	(	struct ext4_xattr_ref *	xattr_ref,
		struct ext4_xattr_item *	item,
		size_t	new_data_size
	)

static

Definition at line 646 of file ext4_xattr.c.

 {
     int ret = 0;
     BOOL to_inode = FALSE, to_block = FALSE;
     size_t old_data_size = item->data_size;
     size_t orig_room_size = item->in_inode ?
         xattr_ref->inode_size_rem :
         xattr_ref->block_size_rem;
 
     /*
      * Check if we can hold this entry in both in-inode and
      * on-block form
      *
      * More complicated case: we do not allow entries stucking in
      * the middle between in-inode space and on-block space, so
      * the entry has to stay in either inode space or block space.
      */
     if (item->in_inode) {
         if (xattr_ref->inode_size_rem +
                    EXT4_XATTR_SIZE(old_data_size) <
                    EXT4_XATTR_SIZE(new_data_size)) {
             if (xattr_ref->block_size_rem <
                        EXT4_XATTR_SIZE(new_data_size) +
                        EXT4_XATTR_LEN(item->name_len))
                 return -ENOSPC;
 
             to_block = TRUE;
         }
     } else {
         if (xattr_ref->block_size_rem +
                 EXT4_XATTR_SIZE(old_data_size) <
                 EXT4_XATTR_SIZE(new_data_size)) {
             if (xattr_ref->inode_size_rem <
                     EXT4_XATTR_SIZE(new_data_size) +
                     EXT4_XATTR_LEN(item->name_len))
                 return -ENOSPC;
 
             to_inode = TRUE;
         }
     }
     ret = ext4_xattr_item_resize_data(item, new_data_size);
     if (ret)
         return ret;
 
     xattr_ref->ea_size =
         xattr_ref->ea_size -
         EXT4_XATTR_SIZE(old_data_size) +
         EXT4_XATTR_SIZE(new_data_size);
 
     /*
      * This entry may originally lie in inode space or block space,
      * and it is going to be transferred to another place.
      */
     if (to_block) {
         xattr_ref->inode_size_rem +=
             EXT4_XATTR_SIZE(old_data_size) +
             EXT4_XATTR_LEN(item->name_len);
         xattr_ref->block_size_rem -=
             EXT4_XATTR_SIZE(new_data_size) +
             EXT4_XATTR_LEN(item->name_len);
         item->in_inode = FALSE;
     } else if (to_inode) {
         xattr_ref->block_size_rem +=
             EXT4_XATTR_SIZE(old_data_size) +
             EXT4_XATTR_LEN(item->name_len);
         xattr_ref->inode_size_rem -=
             EXT4_XATTR_SIZE(new_data_size) +
             EXT4_XATTR_LEN(item->name_len);
         item->in_inode = TRUE;
     } else {
         /*
          * No need to transfer as there is enough space for the entry
          * to stay in inode space or block space it used to be.
          */
         orig_room_size +=
             EXT4_XATTR_SIZE(old_data_size);
         orig_room_size -=
             EXT4_XATTR_SIZE(new_data_size);
         if (item->in_inode)
             xattr_ref->inode_size_rem = orig_room_size;
         else
             xattr_ref->block_size_rem = orig_room_size;
 
     }
     xattr_ref->dirty = TRUE;
     return ret;
 }

Referenced by ext4_fs_set_xattr().

◆ ext4_xattr_set_block_checksum()

static void ext4_xattr_set_block_checksum	(	PEXT2_MCB	inode_ref,
		ext4_fsblk_t	blocknr,
		struct ext4_xattr_header *	header
	)

static

Definition at line 153 of file ext4_xattr.c.

 {
     /* TODO: Need METADATA_CSUM supports. */
     header->h_checksum = 0;
 }

Referenced by ext4_xattr_write_to_disk().

◆ ext4_xattr_set_block_entry()

static void ext4_xattr_set_block_entry	(	struct ext4_xattr_item *	item,
		struct ext4_xattr_header *	block_header,
		struct ext4_xattr_entry *	block_entry,
		void *	block_data_ptr
	)

static

Definition at line 845 of file ext4_xattr.c.

 {
     block_entry->e_name_len = (__u8)item->name_len;
     block_entry->e_name_index = item->name_index;
     block_entry->e_value_offs =
         cpu_to_le16((char *)block_data_ptr - (char *)block_header);
     block_entry->e_value_block = 0;
     block_entry->e_value_size = cpu_to_le32(item->data_size);
 }

Referenced by ext4_xattr_write_to_disk().

◆ ext4_xattr_set_block_header()

static void ext4_xattr_set_block_header ( struct ext4_xattr_ref * xattr_ref )

static

Definition at line 821 of file ext4_xattr.c.

 {
     struct ext4_xattr_header *block_header = NULL;
     block_header = EXT4_XATTR_BHDR(xattr_ref->block_bh);
 
     memset(block_header, 0, sizeof(struct ext4_xattr_header));
     block_header->h_magic = EXT4_XATTR_MAGIC;
     block_header->h_refcount = cpu_to_le32(1);
     block_header->h_blocks = cpu_to_le32(1);
 }

Referenced by ext4_xattr_write_to_disk().

◆ ext4_xattr_set_inode_entry()

static void ext4_xattr_set_inode_entry	(	struct ext4_xattr_item *	item,
		struct ext4_xattr_ibody_header *	ibody_header,
		struct ext4_xattr_entry *	entry,
		void *	ibody_data_ptr
	)

static

Definition at line 833 of file ext4_xattr.c.

 {
     entry->e_name_len = (__u8)item->name_len;
     entry->e_name_index = item->name_index;
     entry->e_value_offs =
        cpu_to_le16((char *)ibody_data_ptr - (char *)EXT4_XATTR_IFIRST(ibody_header));
     entry->e_value_block = 0;
     entry->e_value_size = cpu_to_le32(item->data_size);
 }

Referenced by ext4_xattr_write_to_disk().

◆ ext4_xattr_try_alloc_block()

static int ext4_xattr_try_alloc_block ( struct ext4_xattr_ref * xattr_ref )

static

Definition at line 774 of file ext4_xattr.c.

 {
     int ret = 0;
 
     ext4_fsblk_t xattr_block = 0;
     xattr_block = xattr_ref->inode_ref->Inode.i_file_acl;
     if (!xattr_block) {
         ext4_fsblk_t goal =
             ext4_inode_to_goal_block(&xattr_ref->inode_ref->Inode);
 
         xattr_block = ext4_new_meta_blocks(xattr_ref->IrpContext,
                           &xattr_ref->inode_ref->Inode,
                           goal, 0, NULL,
                           &ret);
         if (ret != 0)
             goto Finish;
 
         xattr_ref->block_bh = extents_bwrite(&xattr_ref->fs->sb, xattr_block);
         if (!xattr_ref->block_bh) {
             ext4_free_blocks(xattr_ref->IrpContext, &xattr_ref->inode_ref->Inode,
                            xattr_block, 1, 0);
             ret = -ENOMEM;
             goto Finish;
         }
 
         xattr_ref->inode_ref->Inode.i_file_acl = xattr_block;
         xattr_ref->IsOnDiskInodeDirty = TRUE;
         xattr_ref->block_loaded = TRUE;
     }
 
 Finish:
     return ret;
 }

Referenced by ext4_xattr_write_to_disk().

◆ ext4_xattr_try_free_block()

static void ext4_xattr_try_free_block ( struct ext4_xattr_ref * xattr_ref )

static

Definition at line 808 of file ext4_xattr.c.

 {
     ext4_fsblk_t xattr_block;
     xattr_block = xattr_ref->inode_ref->Inode.i_file_acl;
     xattr_ref->inode_ref->Inode.i_file_acl = 0;
     extents_brelse(xattr_ref->block_bh);
     xattr_ref->block_bh = NULL;
     ext4_free_blocks(xattr_ref->IrpContext, &xattr_ref->inode_ref->Inode,
         xattr_block, 1, 0);
     xattr_ref->IsOnDiskInodeDirty = TRUE;
     xattr_ref->block_loaded = FALSE;
 }

Referenced by ext4_xattr_write_to_disk().

◆ ext4_xattr_write_to_disk()

static int ext4_xattr_write_to_disk ( struct ext4_xattr_ref * xattr_ref )

static

Definition at line 858 of file ext4_xattr.c.

 {
     int ret = 0;
     BOOL block_modified = FALSE;
     void *ibody_data = NULL;
     void *block_data = NULL;
     size_t inode_size_rem, block_size_rem;
     struct ext4_xattr_ibody_header *ibody_header = NULL;
     struct ext4_xattr_header *block_header = NULL;
     struct ext4_xattr_entry *entry = NULL;
     struct ext4_xattr_entry *block_entry = NULL;
     struct ext4_xattr_item *item = NULL;
 
     inode_size_rem = ext4_xattr_inode_space(xattr_ref);
     block_size_rem = ext4_xattr_block_space(xattr_ref);
     if (inode_size_rem > sizeof(struct ext4_xattr_ibody_header)) {
         ibody_header = EXT4_XATTR_IHDR(xattr_ref->OnDiskInode);
         entry = EXT4_XATTR_IFIRST(ibody_header);
     }
 
     if (!xattr_ref->dirty)
         goto Finish;
     /* If there are enough spaces in the ibody EA table.*/
     if (inode_size_rem > sizeof(struct ext4_xattr_ibody_header)) {
         memset(ibody_header, 0, inode_size_rem);
         ibody_header->h_magic = EXT4_XATTR_MAGIC;
         ibody_data = (char *)ibody_header + inode_size_rem;
         inode_size_rem -= sizeof(struct ext4_xattr_ibody_header);
 
         xattr_ref->IsOnDiskInodeDirty = TRUE;
     }
     /* If we need an extra block to hold the EA entries*/
     if (xattr_ref->ea_size > inode_size_rem) {
         if (!xattr_ref->block_loaded) {
             ret = ext4_xattr_try_alloc_block(xattr_ref);
             if (ret != 0)
                 goto Finish;
         }
         memset(xattr_ref->block_bh->b_data, 0, xattr_ref->fs->BlockSize);
         block_header = EXT4_XATTR_BHDR(xattr_ref->block_bh);
         block_entry = EXT4_XATTR_BFIRST(xattr_ref->block_bh);
         ext4_xattr_set_block_header(xattr_ref);
         block_data = (char *)block_header + block_size_rem;
         block_size_rem -= sizeof(struct ext4_xattr_header);
 
         extents_mark_buffer_dirty(xattr_ref->block_bh);
     } else {
         /* We don't need an extra block.*/
         if (xattr_ref->block_loaded) {
             block_header = EXT4_XATTR_BHDR(xattr_ref->block_bh);
             le32_add_cpu(&block_header->h_refcount, -1);
             if (!block_header->h_refcount) {
                 ext4_xattr_try_free_block(xattr_ref);
                 block_header = NULL;
             } else {
                 block_entry =
                     EXT4_XATTR_BFIRST(xattr_ref->block_bh);
                 block_data =
                     (char *)block_header + block_size_rem;
                 block_size_rem -=
                     sizeof(struct ext4_xattr_header);
                 xattr_ref->inode_ref->Inode.i_file_acl = 0;
 
                 xattr_ref->IsOnDiskInodeDirty = TRUE;
                 extents_mark_buffer_dirty(xattr_ref->block_bh);
             }
         }
     }
 
     list_for_each_entry(item, &xattr_ref->ordered_list, struct ext4_xattr_item, list_node) {
         if (item->in_inode) {
             ibody_data = (char *)ibody_data -
                      EXT4_XATTR_SIZE(item->data_size);
             ext4_xattr_set_inode_entry(item, ibody_header, entry,
                            ibody_data);
             memcpy(EXT4_XATTR_NAME(entry), item->name,
                    item->name_len);
             memcpy(ibody_data, item->data, item->data_size);
             entry = EXT4_XATTR_NEXT(entry);
             inode_size_rem -= EXT4_XATTR_SIZE(item->data_size) +
                       EXT4_XATTR_LEN(item->name_len);
 
             xattr_ref->IsOnDiskInodeDirty = TRUE;
             continue;
         }
         if (EXT4_XATTR_SIZE(item->data_size) +
             EXT4_XATTR_LEN(item->name_len) >
             block_size_rem) {
             ret = -ENOSPC;
             DbgPrint("ext4_xattr.c: IMPOSSIBLE -ENOSPC AS WE DID INSPECTION!\n");
             ASSERT(0);
         }
         block_data =
             (char *)block_data - EXT4_XATTR_SIZE(item->data_size);
         ext4_xattr_set_block_entry(item, block_header, block_entry,
                        block_data);
         memcpy(EXT4_XATTR_NAME(block_entry), item->name,
                item->name_len);
         memcpy(block_data, item->data, item->data_size);
         ext4_xattr_compute_hash(block_header, block_entry);
         block_entry = EXT4_XATTR_NEXT(block_entry);
         block_size_rem -= EXT4_XATTR_SIZE(item->data_size) +
                   EXT4_XATTR_LEN(item->name_len);
 
         block_modified = TRUE;
     }
     xattr_ref->dirty = FALSE;
     if (block_modified) {
         ext4_xattr_rehash(block_header,
                   EXT4_XATTR_BFIRST(xattr_ref->block_bh));
         ext4_xattr_set_block_checksum(xattr_ref->inode_ref,
                           xattr_ref->block_bh->b_blocknr,
                           block_header);
         extents_mark_buffer_dirty(xattr_ref->block_bh);
     }
 
 Finish:
     return ret;
 }

Referenced by ext4_fs_put_xattr_ref().

Variable Documentation

◆ prefix_tbl

const struct xattr_prefix prefix_tbl[]

static

Initial value:

= {
    {"user.", EXT4_XATTR_INDEX_USER},
    {"system.posix_acl_access", EXT4_XATTR_INDEX_POSIX_ACL_ACCESS},
    {"system.posix_acl_default", EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT},
    {"trusted.", EXT4_XATTR_INDEX_TRUSTED},
    {"security.", EXT4_XATTR_INDEX_SECURITY},
    {"system.", EXT4_XATTR_INDEX_SYSTEM},
    {"system.richacl", EXT4_XATTR_INDEX_RICHACL},
    {NULL, 0},
}

Definition at line 1223 of file ext4_xattr.c.

Referenced by ext4_extract_xattr_name(), and ext4_get_xattr_name_prefix().

Classes

Macros

Functions

Variables

Macro Definition Documentation

◆ BLOCK_HASH_SHIFT

◆ ext4_xattr_block_checksum

◆ NAME_HASH_SHIFT

◆ VALUE_HASH_SHIFT

Function Documentation

◆ ext4_free_blocks()

◆ ext4_inode_to_goal_block()

◆ ext4_new_meta_blocks()

◆ ext4_xattr_block_fetch()

◆ ext4_xattr_block_space()

◆ ext4_xattr_compute_hash()

◆ ext4_xattr_entry_data()

◆ ext4_xattr_fetch()

◆ ext4_xattr_inode_fetch()

◆ ext4_xattr_inode_space()

◆ ext4_xattr_insert_item()

◆ ext4_xattr_insert_item_ordered()

◆ ext4_xattr_item_alloc()

◆ ext4_xattr_item_alloc_data()

◆ ext4_xattr_item_cmp()

◆ ext4_xattr_item_free()

◆ ext4_xattr_item_free_data()

◆ ext4_xattr_item_insert()

◆ ext4_xattr_item_remove()

◆ ext4_xattr_item_resize_data()

◆ ext4_xattr_item_search()

◆ ext4_xattr_lookup_item()

◆ ext4_xattr_rehash()

◆ ext4_xattr_remove_item()

◆ ext4_xattr_resize_item()

◆ ext4_xattr_set_block_checksum()

◆ ext4_xattr_set_block_entry()

◆ ext4_xattr_set_block_header()

◆ ext4_xattr_set_inode_entry()

◆ ext4_xattr_try_alloc_block()

◆ ext4_xattr_try_free_block()

◆ ext4_xattr_write_to_disk()

Variable Documentation

◆ prefix_tbl