*/
/*
* Copyright (c) 2011, Lawrence Livermore National Security, LLC.
+ * Copyright (c) 2015 by Chunwei Chen. All rights reserved.
*/
+#ifdef CONFIG_COMPAT
+#include <linux/compat.h>
+#endif
+#include <sys/dmu_objset.h>
#include <sys/zfs_vfsops.h>
#include <sys/zfs_vnops.h>
#include <sys/zfs_znode.h>
static int
zpl_open(struct inode *ip, struct file *filp)
{
- cred_t *cr;
+ cred_t *cr = CRED();
int error;
+ fstrans_cookie_t cookie;
- cr = (cred_t *)get_current_cred();
- error = -zfs_open(ip, filp->f_mode, filp->f_flags, cr);
- put_cred(cr);
- ASSERT3S(error, <=, 0);
-
+ error = generic_file_open(ip, filp);
if (error)
return (error);
- return generic_file_open(ip, filp);
+ crhold(cr);
+ cookie = spl_fstrans_mark();
+ error = -zfs_open(ip, filp->f_mode, filp->f_flags, cr);
+ spl_fstrans_unmark(cookie);
+ crfree(cr);
+ ASSERT3S(error, <=, 0);
+
+ return (error);
}
static int
zpl_release(struct inode *ip, struct file *filp)
{
- cred_t *cr;
+ cred_t *cr = CRED();
int error;
+ fstrans_cookie_t cookie;
- cr = (cred_t *)get_current_cred();
+ cookie = spl_fstrans_mark();
+ if (ITOZ(ip)->z_atime_dirty)
+ zfs_mark_inode_dirty(ip);
+
+ crhold(cr);
error = -zfs_close(ip, filp->f_flags, cr);
- put_cred(cr);
+ spl_fstrans_unmark(cookie);
+ crfree(cr);
+ ASSERT3S(error, <=, 0);
+
+ return (error);
+}
+
+static int
+zpl_iterate(struct file *filp, struct dir_context *ctx)
+{
+ cred_t *cr = CRED();
+ int error;
+ fstrans_cookie_t cookie;
+
+ crhold(cr);
+ cookie = spl_fstrans_mark();
+ error = -zfs_readdir(file_inode(filp), ctx, cr);
+ spl_fstrans_unmark(cookie);
+ crfree(cr);
ASSERT3S(error, <=, 0);
return (error);
}
+#if !defined(HAVE_VFS_ITERATE) && !defined(HAVE_VFS_ITERATE_SHARED)
static int
zpl_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
- struct dentry *dentry = filp->f_path.dentry;
- cred_t *cr;
+ struct dir_context ctx = DIR_CONTEXT_INIT(dirent, filldir, filp->f_pos);
+ int error;
+
+ error = zpl_iterate(filp, &ctx);
+ filp->f_pos = ctx.pos;
+
+ return (error);
+}
+#endif /* HAVE_VFS_ITERATE */
+
+#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;
+ fstrans_cookie_t cookie;
- cr = (cred_t *)get_current_cred();
- error = -zfs_readdir(dentry->d_inode, dirent, filldir,
- &filp->f_pos, cr);
- put_cred(cr);
+ crhold(cr);
+ cookie = spl_fstrans_mark();
+ error = -zfs_fsync(dentry->d_inode, datasync, cr);
+ spl_fstrans_unmark(cookie);
+ crfree(cr);
ASSERT3S(error, <=, 0);
return (error);
}
-ZPL_FSYNC_PROTO(zpl_fsync, filp, unused_dentry, datasync)
+#ifdef HAVE_FILE_AIO_FSYNC
+static int
+zpl_aio_fsync(struct kiocb *kiocb, int datasync)
+{
+ struct file *filp = kiocb->ki_filp;
+ return (zpl_fsync(filp, file_dentry(filp), datasync));
+}
+#endif
+
+#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;
+ fstrans_cookie_t cookie;
- cr = (cred_t *)get_current_cred();
- error = -zfs_fsync(filp->f_path.dentry->d_inode, datasync, cr);
- put_cred(cr);
+ crhold(cr);
+ cookie = spl_fstrans_mark();
+ error = -zfs_fsync(inode, datasync, cr);
+ spl_fstrans_unmark(cookie);
+ crfree(cr);
ASSERT3S(error, <=, 0);
return (error);
}
-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)
+#ifdef HAVE_FILE_AIO_FSYNC
+static int
+zpl_aio_fsync(struct kiocb *kiocb, int datasync)
+{
+ return (zpl_fsync(kiocb->ki_filp, datasync));
+}
+#endif
+
+#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;
- struct iovec iov;
- uio_t uio;
+ fstrans_cookie_t cookie;
- iov.iov_base = (void *)buf;
- iov.iov_len = len;
+ error = filemap_write_and_wait_range(inode->i_mapping, start, end);
+ if (error)
+ return (error);
+
+ crhold(cr);
+ cookie = spl_fstrans_mark();
+ error = -zfs_fsync(inode, datasync, cr);
+ spl_fstrans_unmark(cookie);
+ crfree(cr);
+ ASSERT3S(error, <=, 0);
+
+ return (error);
+}
+
+#ifdef HAVE_FILE_AIO_FSYNC
+static int
+zpl_aio_fsync(struct kiocb *kiocb, int datasync)
+{
+ return (zpl_fsync(kiocb->ki_filp, kiocb->ki_pos, -1, datasync));
+}
+#endif
- uio.uio_iov = &iov;
- uio.uio_resid = len;
- uio.uio_iovcnt = 1;
- uio.uio_loffset = pos;
+#else
+#error "Unsupported fops->fsync() implementation"
+#endif
+
+static ssize_t
+zpl_read_common_iovec(struct inode *ip, const struct iovec *iovp, size_t count,
+ unsigned long nr_segs, loff_t *ppos, uio_seg_t segment, int flags,
+ cred_t *cr, size_t skip)
+{
+ ssize_t read;
+ uio_t uio;
+ int error;
+ fstrans_cookie_t cookie;
+
+ uio.uio_iov = iovp;
+ uio.uio_skip = skip;
+ uio.uio_resid = count;
+ uio.uio_iovcnt = nr_segs;
+ uio.uio_loffset = *ppos;
uio.uio_limit = MAXOFFSET_T;
uio.uio_segflg = segment;
+ cookie = spl_fstrans_mark();
error = -zfs_read(ip, &uio, flags, cr);
+ spl_fstrans_unmark(cookie);
if (error < 0)
return (error);
- return (len - uio.uio_resid);
+ read = count - uio.uio_resid;
+ *ppos += read;
+ task_io_account_read(read);
+
+ return (read);
+}
+
+inline ssize_t
+zpl_read_common(struct inode *ip, const char *buf, size_t len, loff_t *ppos,
+ uio_seg_t segment, int flags, cred_t *cr)
+{
+ struct iovec iov;
+
+ iov.iov_base = (void *)buf;
+ iov.iov_len = len;
+
+ return (zpl_read_common_iovec(ip, &iov, len, 1, ppos, segment,
+ flags, cr, 0));
}
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();
- read = zpl_read_common(filp->f_mapping->host, buf, len, *ppos,
+ crhold(cr);
+ read = zpl_read_common(filp->f_mapping->host, buf, len, ppos,
UIO_USERSPACE, filp->f_flags, cr);
- put_cred(cr);
+ crfree(cr);
+
+ file_accessed(filp);
+ return (read);
+}
- if (read < 0)
- return (read);
+static ssize_t
+zpl_iter_read_common(struct kiocb *kiocb, const struct iovec *iovp,
+ unsigned long nr_segs, size_t count, uio_seg_t seg, size_t skip)
+{
+ cred_t *cr = CRED();
+ struct file *filp = kiocb->ki_filp;
+ ssize_t read;
- *ppos += read;
+ crhold(cr);
+ read = zpl_read_common_iovec(filp->f_mapping->host, iovp, count,
+ nr_segs, &kiocb->ki_pos, seg, filp->f_flags, cr, skip);
+ crfree(cr);
+
+ file_accessed(filp);
return (read);
}
-ssize_t
-zpl_write_common(struct inode *ip, const char *buf, size_t len, loff_t pos,
- uio_seg_t segment, int flags, cred_t *cr)
+#if defined(HAVE_VFS_RW_ITERATE)
+static ssize_t
+zpl_iter_read(struct kiocb *kiocb, struct iov_iter *to)
{
- int error;
- struct iovec iov;
+ ssize_t ret;
+ uio_seg_t seg = UIO_USERSPACE;
+ if (to->type & ITER_KVEC)
+ seg = UIO_SYSSPACE;
+ if (to->type & ITER_BVEC)
+ seg = UIO_BVEC;
+ ret = zpl_iter_read_common(kiocb, to->iov, to->nr_segs,
+ iov_iter_count(to), seg, to->iov_offset);
+ if (ret > 0)
+ iov_iter_advance(to, ret);
+ return (ret);
+}
+#else
+static ssize_t
+zpl_aio_read(struct kiocb *kiocb, const struct iovec *iovp,
+ unsigned long nr_segs, loff_t pos)
+{
+ return (zpl_iter_read_common(kiocb, iovp, nr_segs, kiocb->ki_nbytes,
+ UIO_USERSPACE, 0));
+}
+#endif /* HAVE_VFS_RW_ITERATE */
+
+static ssize_t
+zpl_write_common_iovec(struct inode *ip, const struct iovec *iovp, size_t count,
+ unsigned long nr_segs, loff_t *ppos, uio_seg_t segment, int flags,
+ cred_t *cr, size_t skip)
+{
+ ssize_t wrote;
uio_t uio;
+ int error;
+ fstrans_cookie_t cookie;
- iov.iov_base = (void *)buf;
- iov.iov_len = len;
+ if (flags & O_APPEND)
+ *ppos = i_size_read(ip);
- uio.uio_iov = &iov;
- uio.uio_resid = len,
- uio.uio_iovcnt = 1;
- uio.uio_loffset = pos;
+ uio.uio_iov = iovp;
+ uio.uio_skip = skip;
+ uio.uio_resid = count;
+ uio.uio_iovcnt = nr_segs;
+ uio.uio_loffset = *ppos;
uio.uio_limit = MAXOFFSET_T;
uio.uio_segflg = segment;
+ cookie = spl_fstrans_mark();
error = -zfs_write(ip, &uio, flags, cr);
+ spl_fstrans_unmark(cookie);
if (error < 0)
return (error);
- return (len - uio.uio_resid);
+ wrote = count - uio.uio_resid;
+ *ppos += wrote;
+ task_io_account_write(wrote);
+
+ return (wrote);
+}
+inline ssize_t
+zpl_write_common(struct inode *ip, const char *buf, size_t len, loff_t *ppos,
+ uio_seg_t segment, int flags, cred_t *cr)
+{
+ struct iovec iov;
+
+ iov.iov_base = (void *)buf;
+ iov.iov_len = len;
+
+ return (zpl_write_common_iovec(ip, &iov, len, 1, ppos, segment,
+ flags, cr, 0));
}
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();
- wrote = zpl_write_common(filp->f_mapping->host, buf, len, *ppos,
+ 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 ssize_t
+zpl_iter_write_common(struct kiocb *kiocb, const struct iovec *iovp,
+ unsigned long nr_segs, size_t count, uio_seg_t seg, size_t skip)
+{
+ cred_t *cr = CRED();
+ struct file *filp = kiocb->ki_filp;
+ ssize_t wrote;
+
+ crhold(cr);
+ wrote = zpl_write_common_iovec(filp->f_mapping->host, iovp, count,
+ nr_segs, &kiocb->ki_pos, seg, filp->f_flags, cr, skip);
+ crfree(cr);
- *ppos += wrote;
return (wrote);
}
+#if defined(HAVE_VFS_RW_ITERATE)
+static ssize_t
+zpl_iter_write(struct kiocb *kiocb, struct iov_iter *from)
+{
+ ssize_t ret;
+ uio_seg_t seg = UIO_USERSPACE;
+ if (from->type & ITER_KVEC)
+ seg = UIO_SYSSPACE;
+ if (from->type & ITER_BVEC)
+ seg = UIO_BVEC;
+ ret = zpl_iter_write_common(kiocb, from->iov, from->nr_segs,
+ iov_iter_count(from), seg, from->iov_offset);
+ if (ret > 0)
+ iov_iter_advance(from, ret);
+ return (ret);
+}
+#else
+static ssize_t
+zpl_aio_write(struct kiocb *kiocb, const struct iovec *iovp,
+ unsigned long nr_segs, loff_t pos)
+{
+ return (zpl_iter_write_common(kiocb, iovp, nr_segs, kiocb->ki_nbytes,
+ UIO_USERSPACE, 0));
+}
+#endif /* HAVE_VFS_RW_ITERATE */
+
+static loff_t
+zpl_llseek(struct file *filp, loff_t offset, int whence)
+{
+#if defined(SEEK_HOLE) && defined(SEEK_DATA)
+ fstrans_cookie_t cookie;
+
+ 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_shared(ip);
+ cookie = spl_fstrans_mark();
+ error = -zfs_holey(ip, whence, &offset);
+ spl_fstrans_unmark(cookie);
+ if (error == 0)
+ error = lseek_execute(filp, ip, offset, maxbytes);
+ spl_inode_unlock_shared(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;
+ fstrans_cookie_t cookie;
+
+ cookie = spl_fstrans_mark();
+ error = -zfs_map(ip, vma->vm_pgoff, (caddr_t *)vma->vm_start,
+ (size_t)(vma->vm_end - vma->vm_start), vma->vm_flags);
+ spl_fstrans_unmark(cookie);
+ if (error)
+ return (error);
error = generic_file_mmap(filp, vma);
if (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;
+ fstrans_cookie_t cookie;
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);
+ cookie = spl_fstrans_mark();
+ error = -zfs_getpage(ip, pl, 1);
+ spl_fstrans_unmark(cookie);
if (error) {
SetPageError(pp);
}
unlock_page(pp);
-
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;
+ fstrans_cookie_t cookie;
+
+ ASSERT(PageLocked(pp));
+ ASSERT(!PageWriteback(pp));
+
+ cookie = spl_fstrans_mark();
+ (void) zfs_putpage(mapping->host, pp, wbc);
+ spl_fstrans_unmark(cookie);
+
+ return (0);
+}
+
+static int
+zpl_writepages(struct address_space *mapping, struct writeback_control *wbc)
+{
+ znode_t *zp = ITOZ(mapping->host);
+ zfs_sb_t *zsb = ITOZSB(mapping->host);
+ enum writeback_sync_modes sync_mode;
+ int result;
+
+ ZFS_ENTER(zsb);
+ if (zsb->z_os->os_sync == ZFS_SYNC_ALWAYS)
+ wbc->sync_mode = WB_SYNC_ALL;
+ ZFS_EXIT(zsb);
+ sync_mode = wbc->sync_mode;
+
+ /*
+ * We don't want to run write_cache_pages() in SYNC mode here, because
+ * that would make putpage() wait for a single page to be committed to
+ * disk every single time, resulting in atrocious performance. Instead
+ * we run it once in non-SYNC mode so that the ZIL gets all the data,
+ * and then we commit it all in one go.
+ */
+ wbc->sync_mode = WB_SYNC_NONE;
+ result = write_cache_pages(mapping, wbc, zpl_putpage, mapping);
+ if (sync_mode != wbc->sync_mode) {
+ ZFS_ENTER(zsb);
+ ZFS_VERIFY_ZP(zp);
+ if (zsb->z_log != NULL)
+ zil_commit(zsb->z_log, zp->z_id);
+ ZFS_EXIT(zsb);
+
+ /*
+ * We need to call write_cache_pages() again (we can't just
+ * return after the commit) because the previous call in
+ * non-SYNC mode does not guarantee that we got all the dirty
+ * pages (see the implementation of write_cache_pages() for
+ * details). That being said, this is a no-op in most cases.
+ */
+ wbc->sync_mode = sync_mode;
+ result = write_cache_pages(mapping, wbc, zpl_putpage, mapping);
+ }
+ return (result);
+}
+
/*
* Write out dirty pages to the ARC, this function is only required to
* 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;
+ if (ITOZSB(pp->mapping->host)->z_os->os_sync == ZFS_SYNC_ALWAYS)
+ wbc->sync_mode = WB_SYNC_ALL;
- ASSERT(PageLocked(pp));
- ip = pp->mapping->host;
- off = page_offset(pp);
- i_size = i_size_read(ip);
+ return (zpl_putpage(pp, wbc, pp->mapping));
+}
- cr = (cred_t *)get_current_cred();
- len = MIN(PAGE_CACHE_SIZE, i_size - off);
+/*
+ * The only flag combination which matches the behavior of zfs_space()
+ * is FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE. The FALLOC_FL_PUNCH_HOLE
+ * flag was introduced in the 2.6.38 kernel.
+ */
+#if defined(HAVE_FILE_FALLOCATE) || defined(HAVE_INODE_FALLOCATE)
+long
+zpl_fallocate_common(struct inode *ip, int mode, loff_t offset, loff_t len)
+{
+ int error = -EOPNOTSUPP;
- pb = kmap(pp);
+#if defined(FALLOC_FL_PUNCH_HOLE) && defined(FALLOC_FL_KEEP_SIZE)
+ cred_t *cr = CRED();
+ flock64_t bf;
+ loff_t olen;
+ fstrans_cookie_t cookie;
- /* 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;
+ if (mode != (FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
+ return (error);
- kunmap(pp);
- put_cred(cr);
+ if (offset < 0 || len <= 0)
+ return (-EINVAL);
- if (error) {
- SetPageError(pp);
- ClearPageUptodate(pp);
- } else {
- ClearPageError(pp);
- SetPageUptodate(pp);
+ spl_inode_lock(ip);
+ olen = i_size_read(ip);
+
+ if (offset > olen) {
+ spl_inode_unlock(ip);
+ return (0);
}
+ if (offset + len > olen)
+ len = olen - offset;
+ bf.l_type = F_WRLCK;
+ bf.l_whence = 0;
+ bf.l_start = offset;
+ bf.l_len = len;
+ bf.l_pid = 0;
+
+ crhold(cr);
+ cookie = spl_fstrans_mark();
+ error = -zfs_space(ip, F_FREESP, &bf, FWRITE, offset, cr);
+ spl_fstrans_unmark(cookie);
+ spl_inode_unlock(ip);
+
+ crfree(cr);
+#endif /* defined(FALLOC_FL_PUNCH_HOLE) && defined(FALLOC_FL_KEEP_SIZE) */
- unlock_page(pp);
+ ASSERT3S(error, <=, 0);
+ return (error);
+}
+#endif /* defined(HAVE_FILE_FALLOCATE) || defined(HAVE_INODE_FALLOCATE) */
+
+#ifdef HAVE_FILE_FALLOCATE
+static long
+zpl_fallocate(struct file *filp, int mode, loff_t offset, loff_t len)
+{
+ return zpl_fallocate_common(file_inode(filp),
+ mode, offset, len);
+}
+#endif /* HAVE_FILE_FALLOCATE */
+
+/*
+ * Map zfs file z_pflags (xvattr_t) to linux file attributes. Only file
+ * attributes common to both Linux and Solaris are mapped.
+ */
+static int
+zpl_ioctl_getflags(struct file *filp, void __user *arg)
+{
+ struct inode *ip = file_inode(filp);
+ unsigned int ioctl_flags = 0;
+ uint64_t zfs_flags = ITOZ(ip)->z_pflags;
+ int error;
+
+ if (zfs_flags & ZFS_IMMUTABLE)
+ ioctl_flags |= FS_IMMUTABLE_FL;
+
+ if (zfs_flags & ZFS_APPENDONLY)
+ ioctl_flags |= FS_APPEND_FL;
+
+ if (zfs_flags & ZFS_NODUMP)
+ ioctl_flags |= FS_NODUMP_FL;
+
+ ioctl_flags &= FS_FL_USER_VISIBLE;
+
+ error = copy_to_user(arg, &ioctl_flags, sizeof (ioctl_flags));
return (error);
}
+/*
+ * fchange() is a helper macro to detect if we have been asked to change a
+ * flag. This is ugly, but the requirement that we do this is a consequence of
+ * how the Linux file attribute interface was designed. Another consequence is
+ * that concurrent modification of files suffers from a TOCTOU race. Neither
+ * are things we can fix without modifying the kernel-userland interface, which
+ * is outside of our jurisdiction.
+ */
+
+#define fchange(f0, f1, b0, b1) ((((f0) & (b0)) == (b0)) != \
+ (((b1) & (f1)) == (f1)))
+
+static int
+zpl_ioctl_setflags(struct file *filp, void __user *arg)
+{
+ struct inode *ip = file_inode(filp);
+ uint64_t zfs_flags = ITOZ(ip)->z_pflags;
+ unsigned int ioctl_flags;
+ cred_t *cr = CRED();
+ xvattr_t xva;
+ xoptattr_t *xoap;
+ int error;
+ fstrans_cookie_t cookie;
+
+ if (copy_from_user(&ioctl_flags, arg, sizeof (ioctl_flags)))
+ return (-EFAULT);
+
+ if ((ioctl_flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | FS_NODUMP_FL)))
+ return (-EOPNOTSUPP);
+
+ if ((ioctl_flags & ~(FS_FL_USER_MODIFIABLE)))
+ return (-EACCES);
+
+ if ((fchange(ioctl_flags, zfs_flags, FS_IMMUTABLE_FL, ZFS_IMMUTABLE) ||
+ fchange(ioctl_flags, zfs_flags, FS_APPEND_FL, ZFS_APPENDONLY)) &&
+ !capable(CAP_LINUX_IMMUTABLE))
+ return (-EACCES);
+
+ if (!zpl_inode_owner_or_capable(ip))
+ return (-EACCES);
+
+ xva_init(&xva);
+ xoap = xva_getxoptattr(&xva);
+
+ XVA_SET_REQ(&xva, XAT_IMMUTABLE);
+ if (ioctl_flags & FS_IMMUTABLE_FL)
+ xoap->xoa_immutable = B_TRUE;
+
+ XVA_SET_REQ(&xva, XAT_APPENDONLY);
+ if (ioctl_flags & FS_APPEND_FL)
+ xoap->xoa_appendonly = B_TRUE;
+
+ XVA_SET_REQ(&xva, XAT_NODUMP);
+ if (ioctl_flags & FS_NODUMP_FL)
+ xoap->xoa_nodump = B_TRUE;
+
+ crhold(cr);
+ cookie = spl_fstrans_mark();
+ error = -zfs_setattr(ip, (vattr_t *)&xva, 0, cr);
+ spl_fstrans_unmark(cookie);
+ crfree(cr);
+
+ return (error);
+}
+
+static long
+zpl_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+ switch (cmd) {
+ case FS_IOC_GETFLAGS:
+ return (zpl_ioctl_getflags(filp, (void *)arg));
+ case FS_IOC_SETFLAGS:
+ return (zpl_ioctl_setflags(filp, (void *)arg));
+ default:
+ return (-ENOTTY);
+ }
+}
+
+#ifdef CONFIG_COMPAT
+static long
+zpl_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+ switch (cmd) {
+ case FS_IOC32_GETFLAGS:
+ cmd = FS_IOC_GETFLAGS;
+ break;
+ case FS_IOC32_SETFLAGS:
+ cmd = FS_IOC_SETFLAGS;
+ break;
+ default:
+ return (-ENOTTY);
+ }
+ return (zpl_ioctl(filp, cmd, (unsigned long)compat_ptr(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 = zpl_open,
.release = zpl_release,
- .llseek = generic_file_llseek,
+ .llseek = zpl_llseek,
.read = zpl_read,
.write = zpl_write,
- .readdir = zpl_readdir,
+#ifdef HAVE_VFS_RW_ITERATE
+ .read_iter = zpl_iter_read,
+ .write_iter = zpl_iter_write,
+#else
+ .aio_read = zpl_aio_read,
+ .aio_write = zpl_aio_write,
+#endif
.mmap = zpl_mmap,
.fsync = zpl_fsync,
+#ifdef HAVE_FILE_AIO_FSYNC
+ .aio_fsync = zpl_aio_fsync,
+#endif
+#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 = {
.llseek = generic_file_llseek,
.read = generic_read_dir,
+#ifdef HAVE_VFS_ITERATE_SHARED
+ .iterate_shared = zpl_iterate,
+#elif defined(HAVE_VFS_ITERATE)
+ .iterate = zpl_iterate,
+#else
.readdir = zpl_readdir,
+#endif
.fsync = zpl_fsync,
+ .unlocked_ioctl = zpl_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = zpl_compat_ioctl,
+#endif
};
projects / mirror_zfs.git / blobdiff