static int
+zpl_open(struct inode *ip, struct file *filp)
+{
+ cred_t *cr = CRED();
+ int error;
+
+ crhold(cr);
+ error = -zfs_open(ip, filp->f_mode, filp->f_flags, cr);
+ crfree(cr);
+ ASSERT3S(error, <=, 0);
+
+ if (error)
+ return (error);
+
+ return generic_file_open(ip, filp);
+}
+
+static int
+zpl_release(struct inode *ip, struct file *filp)
+{
+ cred_t *cr = CRED();
+ int error;
+
+ crhold(cr);
+ error = -zfs_close(ip, filp->f_flags, cr);
+ crfree(cr);
+ ASSERT3S(error, <=, 0);
+
+ return (error);
+}
+
+static int
zpl_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
struct dentry *dentry = filp->f_path.dentry;
- cred_t *cr;
+ cred_t *cr = CRED();
int error;
- cr = (cred_t *)get_current_cred();
+ crhold(cr);
error = -zfs_readdir(dentry->d_inode, dirent, filldir,
&filp->f_pos, cr);
- put_cred(cr);
+ crfree(cr);
+ ASSERT3S(error, <=, 0);
+
+ return (error);
+}
+
+#if defined(HAVE_FSYNC_WITH_DENTRY)
+/*
+ * Linux 2.6.x - 2.6.34 API,
+ * Through 2.6.34 the nfsd kernel server would pass a NULL 'file struct *'
+ * to the fops->fsync() hook. For this reason, we must be careful not to
+ * use filp unconditionally.
+ */
+static int
+zpl_fsync(struct file *filp, struct dentry *dentry, int datasync)
+{
+ cred_t *cr = CRED();
+ int error;
+
+ crhold(cr);
+ error = -zfs_fsync(dentry->d_inode, datasync, cr);
+ crfree(cr);
ASSERT3S(error, <=, 0);
return (error);
}
-ZPL_FSYNC_PROTO(zpl_fsync, filp, unused_dentry, datasync)
+#elif defined(HAVE_FSYNC_WITHOUT_DENTRY)
+/*
+ * Linux 2.6.35 - 3.0 API,
+ * As of 2.6.35 the dentry argument to the fops->fsync() hook was deemed
+ * redundant. The dentry is still accessible via filp->f_path.dentry,
+ * and we are guaranteed that filp will never be NULL.
+ */
+static int
+zpl_fsync(struct file *filp, int datasync)
{
- cred_t *cr;
+ struct inode *inode = filp->f_mapping->host;
+ cred_t *cr = CRED();
int error;
- cr = (cred_t *)get_current_cred();
- error = -zfs_fsync(filp->f_path.dentry->d_inode, datasync, cr);
- put_cred(cr);
+ crhold(cr);
+ error = -zfs_fsync(inode, datasync, cr);
+ crfree(cr);
ASSERT3S(error, <=, 0);
return (error);
}
+#elif defined(HAVE_FSYNC_RANGE)
+/*
+ * Linux 3.1 - 3.x API,
+ * As of 3.1 the responsibility to call filemap_write_and_wait_range() has
+ * been pushed down in to the .fsync() vfs hook. Additionally, the i_mutex
+ * lock is no longer held by the caller, for zfs we don't require the lock
+ * to be held so we don't acquire it.
+ */
+static int
+zpl_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
+{
+ struct inode *inode = filp->f_mapping->host;
+ cred_t *cr = CRED();
+ int error;
+
+ error = filemap_write_and_wait_range(inode->i_mapping, start, end);
+ if (error)
+ return (error);
+
+ crhold(cr);
+ error = -zfs_fsync(inode, datasync, cr);
+ crfree(cr);
+ ASSERT3S(error, <=, 0);
+
+ return (error);
+}
+#else
+#error "Unsupported fops->fsync() implementation"
+#endif
+
ssize_t
zpl_read_common(struct inode *ip, const char *buf, size_t len, loff_t pos,
uio_seg_t segment, int flags, cred_t *cr)
static ssize_t
zpl_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos)
{
- cred_t *cr;
+ cred_t *cr = CRED();
ssize_t read;
- cr = (cred_t *)get_current_cred();
+ crhold(cr);
read = zpl_read_common(filp->f_mapping->host, buf, len, *ppos,
UIO_USERSPACE, filp->f_flags, cr);
- put_cred(cr);
+ crfree(cr);
if (read < 0)
return (read);
static ssize_t
zpl_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos)
{
- cred_t *cr;
+ cred_t *cr = CRED();
ssize_t wrote;
- cr = (cred_t *)get_current_cred();
+ crhold(cr);
wrote = zpl_write_common(filp->f_mapping->host, buf, len, *ppos,
UIO_USERSPACE, filp->f_flags, cr);
- put_cred(cr);
+ crfree(cr);
if (wrote < 0)
return (wrote);
return (wrote);
}
+static loff_t
+zpl_llseek(struct file *filp, loff_t offset, int whence)
+{
+#if defined(SEEK_HOLE) && defined(SEEK_DATA)
+ if (whence == SEEK_DATA || whence == SEEK_HOLE) {
+ struct inode *ip = filp->f_mapping->host;
+ loff_t maxbytes = ip->i_sb->s_maxbytes;
+ loff_t error;
+
+ spl_inode_lock(ip);
+ error = -zfs_holey(ip, whence, &offset);
+ if (error == 0)
+ error = lseek_execute(filp, ip, offset, maxbytes);
+ spl_inode_unlock(ip);
+
+ return (error);
+ }
+#endif /* SEEK_HOLE && SEEK_DATA */
+
+ return generic_file_llseek(filp, offset, whence);
+}
+
/*
* It's worth taking a moment to describe how mmap is implemented
* for zfs because it differs considerably from other Linux filesystems.
static int
zpl_mmap(struct file *filp, struct vm_area_struct *vma)
{
- znode_t *zp = ITOZ(filp->f_mapping->host);
+ struct inode *ip = filp->f_mapping->host;
+ znode_t *zp = ITOZ(ip);
int error;
+ error = -zfs_map(ip, vma->vm_pgoff, (caddr_t *)vma->vm_start,
+ (size_t)(vma->vm_end - vma->vm_start), vma->vm_flags);
+ if (error)
+ return (error);
+
error = generic_file_mmap(filp, vma);
if (error)
return (error);
zpl_readpage(struct file *filp, struct page *pp)
{
struct inode *ip;
- loff_t off, i_size;
- size_t len, wrote;
- cred_t *cr;
- void *pb;
+ struct page *pl[1];
int error = 0;
ASSERT(PageLocked(pp));
ip = pp->mapping->host;
- off = page_offset(pp);
- i_size = i_size_read(ip);
- ASSERT3S(off, <, i_size);
-
- cr = (cred_t *)get_current_cred();
- len = MIN(PAGE_CACHE_SIZE, i_size - off);
-
- pb = kmap(pp);
-
- /* O_DIRECT is passed to bypass the page cache and avoid deadlock. */
- wrote = zpl_read_common(ip, pb, len, off, UIO_SYSSPACE, O_DIRECT, cr);
- if (wrote != len)
- error = -EIO;
+ pl[0] = pp;
- if (!error && (len < PAGE_CACHE_SIZE))
- memset(pb + len, 0, PAGE_CACHE_SIZE - len);
-
- kunmap(pp);
- put_cred(cr);
+ error = -zfs_getpage(ip, pl, 1);
if (error) {
SetPageError(pp);
}
unlock_page(pp);
+ return error;
+}
- return (error);
+/*
+ * Populate a set of pages with data for the Linux page cache. This
+ * function will only be called for read ahead and never for demand
+ * paging. For simplicity, the code relies on read_cache_pages() to
+ * correctly lock each page for IO and call zpl_readpage().
+ */
+static int
+zpl_readpages(struct file *filp, struct address_space *mapping,
+ struct list_head *pages, unsigned nr_pages)
+{
+ return (read_cache_pages(mapping, pages,
+ (filler_t *)zpl_readpage, filp));
+}
+
+int
+zpl_putpage(struct page *pp, struct writeback_control *wbc, void *data)
+{
+ struct address_space *mapping = data;
+
+ ASSERT(PageLocked(pp));
+ ASSERT(!PageWriteback(pp));
+ ASSERT(!(current->flags & PF_NOFS));
+
+ /*
+ * Annotate this call path with a flag that indicates that it is
+ * unsafe to use KM_SLEEP during memory allocations due to the
+ * potential for a deadlock. KM_PUSHPAGE should be used instead.
+ */
+ current->flags |= PF_NOFS;
+ (void) zfs_putpage(mapping->host, pp, wbc);
+ current->flags &= ~PF_NOFS;
+
+ return (0);
+}
+
+static int
+zpl_writepages(struct address_space *mapping, struct writeback_control *wbc)
+{
+ return write_cache_pages(mapping, wbc, zpl_putpage, mapping);
}
/*
* support mmap(2). Mapped pages may be dirtied by memory operations
* which never call .write(). These dirty pages are kept in sync with
* the ARC buffers via this hook.
- *
- * Currently this function relies on zpl_write_common() and the O_DIRECT
- * flag to push out the page. This works but the more correct way is
- * to update zfs_putapage() to be Linux friendly and use that interface.
*/
static int
zpl_writepage(struct page *pp, struct writeback_control *wbc)
{
- struct inode *ip;
- loff_t off, i_size;
- size_t len, read;
- cred_t *cr;
- void *pb;
- int error = 0;
+ return zpl_putpage(pp, wbc, pp->mapping);
+}
- ASSERT(PageLocked(pp));
- ip = pp->mapping->host;
- off = page_offset(pp);
- i_size = i_size_read(ip);
+/*
+ * The only flag combination which matches the behavior of zfs_space()
+ * is FALLOC_FL_PUNCH_HOLE. This flag was introduced in the 2.6.38 kernel.
+ */
+long
+zpl_fallocate_common(struct inode *ip, int mode, loff_t offset, loff_t len)
+{
+ cred_t *cr = CRED();
+ int error = -EOPNOTSUPP;
- cr = (cred_t *)get_current_cred();
- len = MIN(PAGE_CACHE_SIZE, i_size - off);
+ if (mode & FALLOC_FL_KEEP_SIZE)
+ return (-EOPNOTSUPP);
- pb = kmap(pp);
+ crhold(cr);
- /* O_DIRECT is passed to bypass the page cache and avoid deadlock. */
- read = zpl_write_common(ip, pb, len, off, UIO_SYSSPACE, O_DIRECT, cr);
- if (read != len)
- error = -EIO;
+#ifdef FALLOC_FL_PUNCH_HOLE
+ if (mode & FALLOC_FL_PUNCH_HOLE) {
+ flock64_t bf;
- kunmap(pp);
- put_cred(cr);
+ bf.l_type = F_WRLCK;
+ bf.l_whence = 0;
+ bf.l_start = offset;
+ bf.l_len = len;
+ bf.l_pid = 0;
- if (error) {
- SetPageError(pp);
- ClearPageUptodate(pp);
- } else {
- ClearPageError(pp);
- SetPageUptodate(pp);
+ error = -zfs_space(ip, F_FREESP, &bf, FWRITE, offset, cr);
}
+#endif /* FALLOC_FL_PUNCH_HOLE */
- unlock_page(pp);
+ crfree(cr);
+ ASSERT3S(error, <=, 0);
return (error);
}
+#ifdef HAVE_FILE_FALLOCATE
+static long
+zpl_fallocate(struct file *filp, int mode, loff_t offset, loff_t len)
+{
+ return zpl_fallocate_common(filp->f_path.dentry->d_inode,
+ mode, offset, len);
+}
+#endif /* HAVE_FILE_FALLOCATE */
+
+static long
+zpl_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+ switch (cmd) {
+ case ZFS_IOC_GETFLAGS:
+ case ZFS_IOC_SETFLAGS:
+ return (-EOPNOTSUPP);
+ default:
+ return (-ENOTTY);
+ }
+}
+
+#ifdef CONFIG_COMPAT
+static long
+zpl_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+ return zpl_ioctl(filp, cmd, arg);
+}
+#endif /* CONFIG_COMPAT */
+
+
const struct address_space_operations zpl_address_space_operations = {
+ .readpages = zpl_readpages,
.readpage = zpl_readpage,
.writepage = zpl_writepage,
+ .writepages = zpl_writepages,
};
const struct file_operations zpl_file_operations = {
- .open = generic_file_open,
- .llseek = generic_file_llseek,
+ .open = zpl_open,
+ .release = zpl_release,
+ .llseek = zpl_llseek,
.read = zpl_read,
.write = zpl_write,
- .readdir = zpl_readdir,
.mmap = zpl_mmap,
.fsync = zpl_fsync,
+#ifdef HAVE_FILE_FALLOCATE
+ .fallocate = zpl_fallocate,
+#endif /* HAVE_FILE_FALLOCATE */
+ .unlocked_ioctl = zpl_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = zpl_compat_ioctl,
+#endif
};
const struct file_operations zpl_dir_file_operations = {
.read = generic_read_dir,
.readdir = zpl_readdir,
.fsync = zpl_fsync,
+ .unlocked_ioctl = zpl_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = zpl_compat_ioctl,
+#endif
};
git://git.camperquake.de / zfs.git / blobdiff