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linux-stable/fs/hfs/inode.c
Linus Torvalds 437589a74b Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 
Pull user namespace changes from Eric Biederman:
 "This is a mostly modest set of changes to enable basic user namespace
  support.  This allows the code to code to compile with user namespaces
  enabled and removes the assumption there is only the initial user
  namespace.  Everything is converted except for the most complex of the
  filesystems: autofs4, 9p, afs, ceph, cifs, coda, fuse, gfs2, ncpfs,
  nfs, ocfs2 and xfs as those patches need a bit more review.

  The strategy is to push kuid_t and kgid_t values are far down into
  subsystems and filesystems as reasonable.  Leaving the make_kuid and
  from_kuid operations to happen at the edge of userspace, as the values
  come off the disk, and as the values come in from the network.
  Letting compile type incompatible compile errors (present when user
  namespaces are enabled) guide me to find the issues.

  The most tricky areas have been the places where we had an implicit
  union of uid and gid values and were storing them in an unsigned int.
  Those places were converted into explicit unions.  I made certain to
  handle those places with simple trivial patches.

  Out of that work I discovered we have generic interfaces for storing
  quota by projid.  I had never heard of the project identifiers before.
  Adding full user namespace support for project identifiers accounts
  for most of the code size growth in my git tree.

  Ultimately there will be work to relax privlige checks from
  "capable(FOO)" to "ns_capable(user_ns, FOO)" where it is safe allowing
  root in a user names to do those things that today we only forbid to
  non-root users because it will confuse suid root applications.

  While I was pushing kuid_t and kgid_t changes deep into the audit code
  I made a few other cleanups.  I capitalized on the fact we process
  netlink messages in the context of the message sender.  I removed
  usage of NETLINK_CRED, and started directly using current->tty.

  Some of these patches have also made it into maintainer trees, with no
  problems from identical code from different trees showing up in
  linux-next.

  After reading through all of this code I feel like I might be able to
  win a game of kernel trivial pursuit."

Fix up some fairly trivial conflicts in netfilter uid/git logging code.

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace: (107 commits)
  userns: Convert the ufs filesystem to use kuid/kgid where appropriate
  userns: Convert the udf filesystem to use kuid/kgid where appropriate
  userns: Convert ubifs to use kuid/kgid
  userns: Convert squashfs to use kuid/kgid where appropriate
  userns: Convert reiserfs to use kuid and kgid where appropriate
  userns: Convert jfs to use kuid/kgid where appropriate
  userns: Convert jffs2 to use kuid and kgid where appropriate
  userns: Convert hpfs to use kuid and kgid where appropriate
  userns: Convert btrfs to use kuid/kgid where appropriate
  userns: Convert bfs to use kuid/kgid where appropriate
  userns: Convert affs to use kuid/kgid wherwe appropriate
  userns: On alpha modify linux_to_osf_stat to use convert from kuids and kgids
  userns: On ia64 deal with current_uid and current_gid being kuid and kgid
  userns: On ppc convert current_uid from a kuid before printing.
  userns: Convert s390 getting uid and gid system calls to use kuid and kgid
  userns: Convert s390 hypfs to use kuid and kgid where appropriate
  userns: Convert binder ipc to use kuids
  userns: Teach security_path_chown to take kuids and kgids
  userns: Add user namespace support to IMA
  userns: Convert EVM to deal with kuids and kgids in it's hmac computation
  ...
2012-10-02 11:11:09 -07:00

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/*
* linux/fs/hfs/inode.c
*
* Copyright (C) 1995-1997 Paul H. Hargrove
* (C) 2003 Ardis Technologies <roman@ardistech.com>
* This file may be distributed under the terms of the GNU General Public License.
*
* This file contains inode-related functions which do not depend on
* which scheme is being used to represent forks.
*
* Based on the minix file system code, (C) 1991, 1992 by Linus Torvalds
*/
#include <linux/pagemap.h>
#include <linux/mpage.h>
#include <linux/sched.h>
#include "hfs_fs.h"
#include "btree.h"
static const struct file_operations hfs_file_operations;
static const struct inode_operations hfs_file_inode_operations;
/*================ Variable-like macros ================*/
#define HFS_VALID_MODE_BITS (S_IFREG | S_IFDIR | S_IRWXUGO)
static int hfs_writepage(struct page *page, struct writeback_control *wbc)
{
return block_write_full_page(page, hfs_get_block, wbc);
}
static int hfs_readpage(struct file *file, struct page *page)
{
return block_read_full_page(page, hfs_get_block);
}
static int hfs_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata)
{
int ret;
*pagep = NULL;
ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
hfs_get_block,
&HFS_I(mapping->host)->phys_size);
if (unlikely(ret)) {
loff_t isize = mapping->host->i_size;
if (pos + len > isize)
vmtruncate(mapping->host, isize);
}
return ret;
}
static sector_t hfs_bmap(struct address_space *mapping, sector_t block)
{
return generic_block_bmap(mapping, block, hfs_get_block);
}
static int hfs_releasepage(struct page *page, gfp_t mask)
{
struct inode *inode = page->mapping->host;
struct super_block *sb = inode->i_sb;
struct hfs_btree *tree;
struct hfs_bnode *node;
u32 nidx;
int i, res = 1;
switch (inode->i_ino) {
case HFS_EXT_CNID:
tree = HFS_SB(sb)->ext_tree;
break;
case HFS_CAT_CNID:
tree = HFS_SB(sb)->cat_tree;
break;
default:
BUG();
return 0;
}
if (!tree)
return 0;
if (tree->node_size >= PAGE_CACHE_SIZE) {
nidx = page->index >> (tree->node_size_shift - PAGE_CACHE_SHIFT);
spin_lock(&tree->hash_lock);
node = hfs_bnode_findhash(tree, nidx);
if (!node)
;
else if (atomic_read(&node->refcnt))
res = 0;
if (res && node) {
hfs_bnode_unhash(node);
hfs_bnode_free(node);
}
spin_unlock(&tree->hash_lock);
} else {
nidx = page->index << (PAGE_CACHE_SHIFT - tree->node_size_shift);
i = 1 << (PAGE_CACHE_SHIFT - tree->node_size_shift);
spin_lock(&tree->hash_lock);
do {
node = hfs_bnode_findhash(tree, nidx++);
if (!node)
continue;
if (atomic_read(&node->refcnt)) {
res = 0;
break;
}
hfs_bnode_unhash(node);
hfs_bnode_free(node);
} while (--i && nidx < tree->node_count);
spin_unlock(&tree->hash_lock);
}
return res ? try_to_free_buffers(page) : 0;
}
static ssize_t hfs_direct_IO(int rw, struct kiocb *iocb,
const struct iovec *iov, loff_t offset, unsigned long nr_segs)
{
struct file *file = iocb->ki_filp;
struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host;
ssize_t ret;
ret = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs,
hfs_get_block);
/*
* In case of error extending write may have instantiated a few
* blocks outside i_size. Trim these off again.
*/
if (unlikely((rw & WRITE) && ret < 0)) {
loff_t isize = i_size_read(inode);
loff_t end = offset + iov_length(iov, nr_segs);
if (end > isize)
vmtruncate(inode, isize);
}
return ret;
}
static int hfs_writepages(struct address_space *mapping,
struct writeback_control *wbc)
{
return mpage_writepages(mapping, wbc, hfs_get_block);
}
const struct address_space_operations hfs_btree_aops = {
.readpage = hfs_readpage,
.writepage = hfs_writepage,
.write_begin = hfs_write_begin,
.write_end = generic_write_end,
.bmap = hfs_bmap,
.releasepage = hfs_releasepage,
};
const struct address_space_operations hfs_aops = {
.readpage = hfs_readpage,
.writepage = hfs_writepage,
.write_begin = hfs_write_begin,
.write_end = generic_write_end,
.bmap = hfs_bmap,
.direct_IO = hfs_direct_IO,
.writepages = hfs_writepages,
};
/*
* hfs_new_inode
*/
struct inode *hfs_new_inode(struct inode *dir, struct qstr *name, umode_t mode)
{
struct super_block *sb = dir->i_sb;
struct inode *inode = new_inode(sb);
if (!inode)
return NULL;
mutex_init(&HFS_I(inode)->extents_lock);
INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
hfs_cat_build_key(sb, (btree_key *)&HFS_I(inode)->cat_key, dir->i_ino, name);
inode->i_ino = HFS_SB(sb)->next_id++;
inode->i_mode = mode;
inode->i_uid = current_fsuid();
inode->i_gid = current_fsgid();
set_nlink(inode, 1);
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
HFS_I(inode)->flags = 0;
HFS_I(inode)->rsrc_inode = NULL;
HFS_I(inode)->fs_blocks = 0;
if (S_ISDIR(mode)) {
inode->i_size = 2;
HFS_SB(sb)->folder_count++;
if (dir->i_ino == HFS_ROOT_CNID)
HFS_SB(sb)->root_dirs++;
inode->i_op = &hfs_dir_inode_operations;
inode->i_fop = &hfs_dir_operations;
inode->i_mode |= S_IRWXUGO;
inode->i_mode &= ~HFS_SB(inode->i_sb)->s_dir_umask;
} else if (S_ISREG(mode)) {
HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
HFS_SB(sb)->file_count++;
if (dir->i_ino == HFS_ROOT_CNID)
HFS_SB(sb)->root_files++;
inode->i_op = &hfs_file_inode_operations;
inode->i_fop = &hfs_file_operations;
inode->i_mapping->a_ops = &hfs_aops;
inode->i_mode |= S_IRUGO|S_IXUGO;
if (mode & S_IWUSR)
inode->i_mode |= S_IWUGO;
inode->i_mode &= ~HFS_SB(inode->i_sb)->s_file_umask;
HFS_I(inode)->phys_size = 0;
HFS_I(inode)->alloc_blocks = 0;
HFS_I(inode)->first_blocks = 0;
HFS_I(inode)->cached_start = 0;
HFS_I(inode)->cached_blocks = 0;
memset(HFS_I(inode)->first_extents, 0, sizeof(hfs_extent_rec));
memset(HFS_I(inode)->cached_extents, 0, sizeof(hfs_extent_rec));
}
insert_inode_hash(inode);
mark_inode_dirty(inode);
set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
hfs_mark_mdb_dirty(sb);
return inode;
}
void hfs_delete_inode(struct inode *inode)
{
struct super_block *sb = inode->i_sb;
dprint(DBG_INODE, "delete_inode: %lu\n", inode->i_ino);
if (S_ISDIR(inode->i_mode)) {
HFS_SB(sb)->folder_count--;
if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
HFS_SB(sb)->root_dirs--;
set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
hfs_mark_mdb_dirty(sb);
return;
}
HFS_SB(sb)->file_count--;
if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
HFS_SB(sb)->root_files--;
if (S_ISREG(inode->i_mode)) {
if (!inode->i_nlink) {
inode->i_size = 0;
hfs_file_truncate(inode);
}
}
set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
hfs_mark_mdb_dirty(sb);
}
void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext,
__be32 __log_size, __be32 phys_size, u32 clump_size)
{
struct super_block *sb = inode->i_sb;
u32 log_size = be32_to_cpu(__log_size);
u16 count;
int i;
memcpy(HFS_I(inode)->first_extents, ext, sizeof(hfs_extent_rec));
for (count = 0, i = 0; i < 3; i++)
count += be16_to_cpu(ext[i].count);
HFS_I(inode)->first_blocks = count;
inode->i_size = HFS_I(inode)->phys_size = log_size;
HFS_I(inode)->fs_blocks = (log_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
inode_set_bytes(inode, HFS_I(inode)->fs_blocks << sb->s_blocksize_bits);
HFS_I(inode)->alloc_blocks = be32_to_cpu(phys_size) /
HFS_SB(sb)->alloc_blksz;
HFS_I(inode)->clump_blocks = clump_size / HFS_SB(sb)->alloc_blksz;
if (!HFS_I(inode)->clump_blocks)
HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
}
struct hfs_iget_data {
struct hfs_cat_key *key;
hfs_cat_rec *rec;
};
static int hfs_test_inode(struct inode *inode, void *data)
{
struct hfs_iget_data *idata = data;
hfs_cat_rec *rec;
rec = idata->rec;
switch (rec->type) {
case HFS_CDR_DIR:
return inode->i_ino == be32_to_cpu(rec->dir.DirID);
case HFS_CDR_FIL:
return inode->i_ino == be32_to_cpu(rec->file.FlNum);
default:
BUG();
return 1;
}
}
/*
* hfs_read_inode
*/
static int hfs_read_inode(struct inode *inode, void *data)
{
struct hfs_iget_data *idata = data;
struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
hfs_cat_rec *rec;
HFS_I(inode)->flags = 0;
HFS_I(inode)->rsrc_inode = NULL;
mutex_init(&HFS_I(inode)->extents_lock);
INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
/* Initialize the inode */
inode->i_uid = hsb->s_uid;
inode->i_gid = hsb->s_gid;
set_nlink(inode, 1);
if (idata->key)
HFS_I(inode)->cat_key = *idata->key;
else
HFS_I(inode)->flags |= HFS_FLG_RSRC;
HFS_I(inode)->tz_secondswest = sys_tz.tz_minuteswest * 60;
rec = idata->rec;
switch (rec->type) {
case HFS_CDR_FIL:
if (!HFS_IS_RSRC(inode)) {
hfs_inode_read_fork(inode, rec->file.ExtRec, rec->file.LgLen,
rec->file.PyLen, be16_to_cpu(rec->file.ClpSize));
} else {
hfs_inode_read_fork(inode, rec->file.RExtRec, rec->file.RLgLen,
rec->file.RPyLen, be16_to_cpu(rec->file.ClpSize));
}
inode->i_ino = be32_to_cpu(rec->file.FlNum);
inode->i_mode = S_IRUGO | S_IXUGO;
if (!(rec->file.Flags & HFS_FIL_LOCK))
inode->i_mode |= S_IWUGO;
inode->i_mode &= ~hsb->s_file_umask;
inode->i_mode |= S_IFREG;
inode->i_ctime = inode->i_atime = inode->i_mtime =
hfs_m_to_utime(rec->file.MdDat);
inode->i_op = &hfs_file_inode_operations;
inode->i_fop = &hfs_file_operations;
inode->i_mapping->a_ops = &hfs_aops;
break;
case HFS_CDR_DIR:
inode->i_ino = be32_to_cpu(rec->dir.DirID);
inode->i_size = be16_to_cpu(rec->dir.Val) + 2;
HFS_I(inode)->fs_blocks = 0;
inode->i_mode = S_IFDIR | (S_IRWXUGO & ~hsb->s_dir_umask);
inode->i_ctime = inode->i_atime = inode->i_mtime =
hfs_m_to_utime(rec->dir.MdDat);
inode->i_op = &hfs_dir_inode_operations;
inode->i_fop = &hfs_dir_operations;
break;
default:
make_bad_inode(inode);
}
return 0;
}
/*
* __hfs_iget()
*
* Given the MDB for a HFS filesystem, a 'key' and an 'entry' in
* the catalog B-tree and the 'type' of the desired file return the
* inode for that file/directory or NULL. Note that 'type' indicates
* whether we want the actual file or directory, or the corresponding
* metadata (AppleDouble header file or CAP metadata file).
*/
struct inode *hfs_iget(struct super_block *sb, struct hfs_cat_key *key, hfs_cat_rec *rec)
{
struct hfs_iget_data data = { key, rec };
struct inode *inode;
u32 cnid;
switch (rec->type) {
case HFS_CDR_DIR:
cnid = be32_to_cpu(rec->dir.DirID);
break;
case HFS_CDR_FIL:
cnid = be32_to_cpu(rec->file.FlNum);
break;
default:
return NULL;
}
inode = iget5_locked(sb, cnid, hfs_test_inode, hfs_read_inode, &data);
if (inode && (inode->i_state & I_NEW))
unlock_new_inode(inode);
return inode;
}
void hfs_inode_write_fork(struct inode *inode, struct hfs_extent *ext,
__be32 *log_size, __be32 *phys_size)
{
memcpy(ext, HFS_I(inode)->first_extents, sizeof(hfs_extent_rec));
if (log_size)
*log_size = cpu_to_be32(inode->i_size);
if (phys_size)
*phys_size = cpu_to_be32(HFS_I(inode)->alloc_blocks *
HFS_SB(inode->i_sb)->alloc_blksz);
}
int hfs_write_inode(struct inode *inode, struct writeback_control *wbc)
{
struct inode *main_inode = inode;
struct hfs_find_data fd;
hfs_cat_rec rec;
dprint(DBG_INODE, "hfs_write_inode: %lu\n", inode->i_ino);
hfs_ext_write_extent(inode);
if (inode->i_ino < HFS_FIRSTUSER_CNID) {
switch (inode->i_ino) {
case HFS_ROOT_CNID:
break;
case HFS_EXT_CNID:
hfs_btree_write(HFS_SB(inode->i_sb)->ext_tree);
return 0;
case HFS_CAT_CNID:
hfs_btree_write(HFS_SB(inode->i_sb)->cat_tree);
return 0;
default:
BUG();
return -EIO;
}
}
if (HFS_IS_RSRC(inode))
main_inode = HFS_I(inode)->rsrc_inode;
if (!main_inode->i_nlink)
return 0;
if (hfs_find_init(HFS_SB(main_inode->i_sb)->cat_tree, &fd))
/* panic? */
return -EIO;
fd.search_key->cat = HFS_I(main_inode)->cat_key;
if (hfs_brec_find(&fd))
/* panic? */
goto out;
if (S_ISDIR(main_inode->i_mode)) {
if (fd.entrylength < sizeof(struct hfs_cat_dir))
/* panic? */;
hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
sizeof(struct hfs_cat_dir));
if (rec.type != HFS_CDR_DIR ||
be32_to_cpu(rec.dir.DirID) != inode->i_ino) {
}
rec.dir.MdDat = hfs_u_to_mtime(inode->i_mtime);
rec.dir.Val = cpu_to_be16(inode->i_size - 2);
hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
sizeof(struct hfs_cat_dir));
} else if (HFS_IS_RSRC(inode)) {
hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
sizeof(struct hfs_cat_file));
hfs_inode_write_fork(inode, rec.file.RExtRec,
&rec.file.RLgLen, &rec.file.RPyLen);
hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
sizeof(struct hfs_cat_file));
} else {
if (fd.entrylength < sizeof(struct hfs_cat_file))
/* panic? */;
hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
sizeof(struct hfs_cat_file));
if (rec.type != HFS_CDR_FIL ||
be32_to_cpu(rec.file.FlNum) != inode->i_ino) {
}
if (inode->i_mode & S_IWUSR)
rec.file.Flags &= ~HFS_FIL_LOCK;
else
rec.file.Flags |= HFS_FIL_LOCK;
hfs_inode_write_fork(inode, rec.file.ExtRec, &rec.file.LgLen, &rec.file.PyLen);
rec.file.MdDat = hfs_u_to_mtime(inode->i_mtime);
hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
sizeof(struct hfs_cat_file));
}
out:
hfs_find_exit(&fd);
return 0;
}
static struct dentry *hfs_file_lookup(struct inode *dir, struct dentry *dentry,
unsigned int flags)
{
struct inode *inode = NULL;
hfs_cat_rec rec;
struct hfs_find_data fd;
int res;
if (HFS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc"))
goto out;
inode = HFS_I(dir)->rsrc_inode;
if (inode)
goto out;
inode = new_inode(dir->i_sb);
if (!inode)
return ERR_PTR(-ENOMEM);
hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd);
fd.search_key->cat = HFS_I(dir)->cat_key;
res = hfs_brec_read(&fd, &rec, sizeof(rec));
if (!res) {
struct hfs_iget_data idata = { NULL, &rec };
hfs_read_inode(inode, &idata);
}
hfs_find_exit(&fd);
if (res) {
iput(inode);
return ERR_PTR(res);
}
HFS_I(inode)->rsrc_inode = dir;
HFS_I(dir)->rsrc_inode = inode;
igrab(dir);
hlist_add_fake(&inode->i_hash);
mark_inode_dirty(inode);
out:
d_add(dentry, inode);
return NULL;
}
void hfs_evict_inode(struct inode *inode)
{
truncate_inode_pages(&inode->i_data, 0);
clear_inode(inode);
if (HFS_IS_RSRC(inode) && HFS_I(inode)->rsrc_inode) {
HFS_I(HFS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
iput(HFS_I(inode)->rsrc_inode);
}
}
static int hfs_file_open(struct inode *inode, struct file *file)
{
if (HFS_IS_RSRC(inode))
inode = HFS_I(inode)->rsrc_inode;
atomic_inc(&HFS_I(inode)->opencnt);
return 0;
}
static int hfs_file_release(struct inode *inode, struct file *file)
{
//struct super_block *sb = inode->i_sb;
if (HFS_IS_RSRC(inode))
inode = HFS_I(inode)->rsrc_inode;
if (atomic_dec_and_test(&HFS_I(inode)->opencnt)) {
mutex_lock(&inode->i_mutex);
hfs_file_truncate(inode);
//if (inode->i_flags & S_DEAD) {
// hfs_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
// hfs_delete_inode(inode);
//}
mutex_unlock(&inode->i_mutex);
}
return 0;
}
/*
* hfs_notify_change()
*
* Based very closely on fs/msdos/inode.c by Werner Almesberger
*
* This is the notify_change() field in the super_operations structure
* for HFS file systems. The purpose is to take that changes made to
* an inode and apply then in a filesystem-dependent manner. In this
* case the process has a few of tasks to do:
* 1) prevent changes to the i_uid and i_gid fields.
* 2) map file permissions to the closest allowable permissions
* 3) Since multiple Linux files can share the same on-disk inode under
* HFS (for instance the data and resource forks of a file) a change
* to permissions must be applied to all other in-core inodes which
* correspond to the same HFS file.
*/
int hfs_inode_setattr(struct dentry *dentry, struct iattr * attr)
{
struct inode *inode = dentry->d_inode;
struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
int error;
error = inode_change_ok(inode, attr); /* basic permission checks */
if (error)
return error;
/* no uig/gid changes and limit which mode bits can be set */
if (((attr->ia_valid & ATTR_UID) &&
(!uid_eq(attr->ia_uid, hsb->s_uid))) ||
((attr->ia_valid & ATTR_GID) &&
(!gid_eq(attr->ia_gid, hsb->s_gid))) ||
((attr->ia_valid & ATTR_MODE) &&
((S_ISDIR(inode->i_mode) &&
(attr->ia_mode != inode->i_mode)) ||
(attr->ia_mode & ~HFS_VALID_MODE_BITS)))) {
return hsb->s_quiet ? 0 : error;
}
if (attr->ia_valid & ATTR_MODE) {
/* Only the 'w' bits can ever change and only all together. */
if (attr->ia_mode & S_IWUSR)
attr->ia_mode = inode->i_mode | S_IWUGO;
else
attr->ia_mode = inode->i_mode & ~S_IWUGO;
attr->ia_mode &= S_ISDIR(inode->i_mode) ? ~hsb->s_dir_umask: ~hsb->s_file_umask;
}
if ((attr->ia_valid & ATTR_SIZE) &&
attr->ia_size != i_size_read(inode)) {
inode_dio_wait(inode);
error = vmtruncate(inode, attr->ia_size);
if (error)
return error;
}
setattr_copy(inode, attr);
mark_inode_dirty(inode);
return 0;
}
static int hfs_file_fsync(struct file *filp, loff_t start, loff_t end,
int datasync)
{
struct inode *inode = filp->f_mapping->host;
struct super_block * sb;
int ret, err;
ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
if (ret)
return ret;
mutex_lock(&inode->i_mutex);
/* sync the inode to buffers */
ret = write_inode_now(inode, 0);
/* sync the superblock to buffers */
sb = inode->i_sb;
flush_delayed_work(&HFS_SB(sb)->mdb_work);
/* .. finally sync the buffers to disk */
err = sync_blockdev(sb->s_bdev);
if (!ret)
ret = err;
mutex_unlock(&inode->i_mutex);
return ret;
}
static const struct file_operations hfs_file_operations = {
.llseek = generic_file_llseek,
.read = do_sync_read,
.aio_read = generic_file_aio_read,
.write = do_sync_write,
.aio_write = generic_file_aio_write,
.mmap = generic_file_mmap,
.splice_read = generic_file_splice_read,
.fsync = hfs_file_fsync,
.open = hfs_file_open,
.release = hfs_file_release,
};
static const struct inode_operations hfs_file_inode_operations = {
.lookup = hfs_file_lookup,
.truncate = hfs_file_truncate,
.setattr = hfs_inode_setattr,
.setxattr = hfs_setxattr,
.getxattr = hfs_getxattr,
.listxattr = hfs_listxattr,
};
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