*/
/*
* 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/file.h>
+#include <sys/dmu_objset.h>
#include <sys/zfs_vfsops.h>
#include <sys/zfs_vnops.h>
#include <sys/zfs_znode.h>
-#include <sys/zpl.h>
+#include <sys/zfs_project.h>
static int
{
cred_t *cr = CRED();
int error;
+ fstrans_cookie_t cookie;
+
+ error = generic_file_open(ip, filp);
+ if (error)
+ return (error);
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);
- if (error)
- return (error);
-
- return generic_file_open(ip, filp);
+ return (error);
}
static int
{
cred_t *cr = CRED();
int error;
+ fstrans_cookie_t cookie;
+
+ 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);
+ spl_fstrans_unmark(cookie);
+ crfree(cr);
+ ASSERT3S(error, <=, 0);
+
+ return (error);
+}
+
+static int
+zpl_iterate(struct file *filp, zpl_dir_context_t *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;
+ zpl_dir_context_t ctx =
+ ZPL_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 && !HAVE_VFS_ITERATE_SHARED */
+
+#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;
crhold(cr);
- error = -zfs_readdir(dentry->d_inode, dirent, filldir,
- &filp->f_pos, cr);
+ cookie = spl_fstrans_mark();
+ error = -zfs_fsync(dentry->d_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)
+{
+ struct file *filp = kiocb->ki_filp;
+ return (zpl_fsync(filp, file_dentry(filp), datasync));
+}
+#endif
+
+#elif defined(HAVE_FSYNC_WITHOUT_DENTRY)
/*
- * 2.6.35 API change,
- * As of 2.6.35 the dentry argument to the .fsync() vfs hook was deemed
+ * 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.
- *
- * 2.6.34 API change,
- * Prior to 2.6.34 the nfsd kernel server would pass a NULL file struct *
- * to the .fsync() hook. For this reason, we must be careful not to use
- * filp unconditionally in the 3 argument case.
*/
-#ifdef HAVE_2ARGS_FSYNC
static int
zpl_fsync(struct file *filp, int datasync)
{
- struct dentry *dentry = filp->f_path.dentry;
-#else
+ struct inode *inode = filp->f_mapping->host;
+ cred_t *cr = CRED();
+ int error;
+ fstrans_cookie_t cookie;
+
+ 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_fsync(struct file *filp, struct dentry *dentry, int datasync)
+zpl_aio_fsync(struct kiocb *kiocb, int datasync)
{
-#endif /* HAVE_2ARGS_FSYNC */
+ 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;
+ fstrans_cookie_t cookie;
+
+ error = filemap_write_and_wait_range(inode->i_mapping, start, end);
+ if (error)
+ return (error);
crhold(cr);
- error = -zfs_fsync(dentry->d_inode, datasync, 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)
{
- int error;
- struct iovec iov;
- uio_t uio;
+ return (zpl_fsync(kiocb->ki_filp, kiocb->ki_pos, -1, datasync));
+}
+#endif
- iov.iov_base = (void *)buf;
- iov.iov_len = len;
+#else
+#error "Unsupported fops->fsync() implementation"
+#endif
+
+static inline int
+zfs_io_flags(struct kiocb *kiocb)
+{
+ int flags = 0;
+
+#if defined(IOCB_DSYNC)
+ if (kiocb->ki_flags & IOCB_DSYNC)
+ flags |= FDSYNC;
+#endif
+#if defined(IOCB_SYNC)
+ if (kiocb->ki_flags & IOCB_SYNC)
+ flags |= FSYNC;
+#endif
+#if defined(IOCB_APPEND)
+ if (kiocb->ki_flags & IOCB_APPEND)
+ flags |= FAPPEND;
+#endif
+#if defined(IOCB_DIRECT)
+ if (kiocb->ki_flags & IOCB_DIRECT)
+ flags |= FDIRECT;
+#endif
+ return (flags);
+}
+
+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 = &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_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;
+
+ 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)
+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;
+ unsigned int f_flags = filp->f_flags;
+ f_flags |= zfs_io_flags(kiocb);
crhold(cr);
- read = zpl_read_common(filp->f_mapping->host, buf, len, *ppos,
- UIO_USERSPACE, filp->f_flags, cr);
+ read = zpl_read_common_iovec(filp->f_mapping->host, iovp, count,
+ nr_segs, &kiocb->ki_pos, seg, f_flags, cr, skip);
crfree(cr);
- if (read < 0)
- return (read);
-
- *ppos += read;
+ 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)
+{
+ ssize_t ret;
+ size_t count;
+
+ ret = generic_segment_checks(iovp, &nr_segs, &count, VERIFY_WRITE);
+ if (ret)
+ return (ret);
+
+ return (zpl_iter_read_common(kiocb, iovp, nr_segs, count,
+ 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;
+
+ 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)
+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;
+ unsigned int f_flags = filp->f_flags;
+ f_flags |= zfs_io_flags(kiocb);
crhold(cr);
- wrote = zpl_write_common(filp->f_mapping->host, buf, len, *ppos,
- UIO_USERSPACE, filp->f_flags, cr);
+ wrote = zpl_write_common_iovec(filp->f_mapping->host, iovp, count,
+ nr_segs, &kiocb->ki_pos, seg, f_flags, cr, skip);
crfree(cr);
- if (wrote < 0)
- return (wrote);
-
- *ppos += wrote;
return (wrote);
}
+#if defined(HAVE_VFS_RW_ITERATE)
+static ssize_t
+zpl_iter_write(struct kiocb *kiocb, struct iov_iter *from)
+{
+ size_t count;
+ ssize_t ret;
+ uio_seg_t seg = UIO_USERSPACE;
+
+#ifndef HAVE_GENERIC_WRITE_CHECKS_KIOCB
+ struct file *file = kiocb->ki_filp;
+ struct address_space *mapping = file->f_mapping;
+ struct inode *ip = mapping->host;
+ int isblk = S_ISBLK(ip->i_mode);
+
+ count = iov_iter_count(from);
+ ret = generic_write_checks(file, &kiocb->ki_pos, &count, isblk);
+ if (ret)
+ return (ret);
+#else
+ /*
+ * XXX - ideally this check should be in the same lock region with
+ * write operations, so that there's no TOCTTOU race when doing
+ * append and someone else grow the file.
+ */
+ ret = generic_write_checks(kiocb, from);
+ if (ret <= 0)
+ return (ret);
+ count = ret;
+#endif
+
+ 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,
+ count, 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)
+{
+ struct file *file = kiocb->ki_filp;
+ struct address_space *mapping = file->f_mapping;
+ struct inode *ip = mapping->host;
+ int isblk = S_ISBLK(ip->i_mode);
+ size_t count;
+ ssize_t ret;
+
+ ret = generic_segment_checks(iovp, &nr_segs, &count, VERIFY_READ);
+ if (ret)
+ return (ret);
+
+ ret = generic_write_checks(file, &pos, &count, isblk);
+ if (ret)
+ return (ret);
+
+ return (zpl_iter_write_common(kiocb, iovp, nr_segs, count,
+ UIO_USERSPACE, 0));
+}
+#endif /* HAVE_VFS_RW_ITERATE */
+
+#if defined(HAVE_VFS_RW_ITERATE)
+static ssize_t
+zpl_direct_IO_impl(int rw, struct kiocb *kiocb, struct iov_iter *iter)
+{
+ if (rw == WRITE)
+ return (zpl_iter_write(kiocb, iter));
+ else
+ return (zpl_iter_read(kiocb, iter));
+}
+#if defined(HAVE_VFS_DIRECT_IO_ITER)
+static ssize_t
+zpl_direct_IO(struct kiocb *kiocb, struct iov_iter *iter)
+{
+ return (zpl_direct_IO_impl(iov_iter_rw(iter), kiocb, iter));
+}
+#elif defined(HAVE_VFS_DIRECT_IO_ITER_OFFSET)
+static ssize_t
+zpl_direct_IO(struct kiocb *kiocb, struct iov_iter *iter, loff_t pos)
+{
+ ASSERT3S(pos, ==, kiocb->ki_pos);
+ return (zpl_direct_IO_impl(iov_iter_rw(iter), kiocb, iter));
+}
+#elif defined(HAVE_VFS_DIRECT_IO_ITER_RW_OFFSET)
+static ssize_t
+zpl_direct_IO(int rw, struct kiocb *kiocb, struct iov_iter *iter, loff_t pos)
+{
+ ASSERT3S(pos, ==, kiocb->ki_pos);
+ return (zpl_direct_IO_impl(rw, kiocb, iter));
+}
+#else
+#error "Unknown direct IO interface"
+#endif
+
+#else
+
+#if defined(HAVE_VFS_DIRECT_IO_IOVEC)
+static ssize_t
+zpl_direct_IO(int rw, struct kiocb *kiocb, const struct iovec *iovp,
+ loff_t pos, unsigned long nr_segs)
+{
+ if (rw == WRITE)
+ return (zpl_aio_write(kiocb, iovp, nr_segs, pos));
+ else
+ return (zpl_aio_read(kiocb, iovp, nr_segs, pos));
+}
+#else
+#error "Unknown direct IO interface"
+#endif
+
+#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.
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);
return (error);
mutex_enter(&zp->z_lock);
- zp->z_is_mapped = 1;
+ zp->z_is_mapped = B_TRUE;
mutex_exit(&zp->z_lock);
return (error);
}
-static struct page **
-pages_vector_from_list(struct list_head *pages, unsigned nr_pages)
-{
- struct page **pl;
- struct page *t;
- unsigned page_idx;
-
- pl = kmalloc(sizeof(*pl) * nr_pages, GFP_NOFS);
- if (!pl)
- return ERR_PTR(-ENOMEM);
-
- page_idx = 0;
- list_for_each_entry_reverse(t, pages, lru) {
- pl[page_idx] = t;
- page_idx++;
- }
-
- return pl;
-}
-
-static int
-zpl_readpages(struct file *file, struct address_space *mapping,
- struct list_head *pages, unsigned nr_pages)
-{
- struct inode *ip;
- struct page **pl;
- struct page *p, *n;
- int error;
-
- ip = mapping->host;
-
- pl = pages_vector_from_list(pages, nr_pages);
- if (IS_ERR(pl))
- return PTR_ERR(pl);
-
- error = -zfs_getpage(ip, pl, nr_pages);
- if (error)
- goto error;
-
- list_for_each_entry_safe_reverse(p, n, pages, lru) {
-
- list_del(&p->lru);
-
- flush_dcache_page(p);
- SetPageUptodate(p);
- unlock_page(p);
- page_cache_release(p);
- }
-
-error:
- kfree(pl);
- return error;
-}
-
/*
* Populate a page with data for the Linux page cache. This function is
* only used to support mmap(2). There will be an identical copy of the
struct inode *ip;
struct page *pl[1];
int error = 0;
+ fstrans_cookie_t cookie;
ASSERT(PageLocked(pp));
ip = pp->mapping->host;
pl[0] = pp;
+ cookie = spl_fstrans_mark();
error = -zfs_getpage(ip, pl, 1);
+ spl_fstrans_unmark(cookie);
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;
+ fstrans_cookie_t cookie;
ASSERT(PageLocked(pp));
ASSERT(!PageWriteback(pp));
- /*
- * Disable the normal reclaim path for zpl_putpage(). This
- * ensures that all memory allocations under this call path
- * will never enter direct reclaim. If this were to happen
- * the VM might try to write out additional pages by calling
- * zpl_putpage() again resulting in a deadlock.
- */
- current->flags |= PF_MEMALLOC;
+ cookie = spl_fstrans_mark();
(void) zfs_putpage(mapping->host, pp, wbc);
- current->flags &= ~PF_MEMALLOC;
+ spl_fstrans_unmark(cookie);
return (0);
}
static int
zpl_writepages(struct address_space *mapping, struct writeback_control *wbc)
{
- return write_cache_pages(mapping, wbc, zpl_putpage, mapping);
+ znode_t *zp = ITOZ(mapping->host);
+ zfsvfs_t *zfsvfs = ITOZSB(mapping->host);
+ enum writeback_sync_modes sync_mode;
+ int result;
+
+ ZFS_ENTER(zfsvfs);
+ if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
+ wbc->sync_mode = WB_SYNC_ALL;
+ ZFS_EXIT(zfsvfs);
+ 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(zfsvfs);
+ ZFS_VERIFY_ZP(zp);
+ if (zfsvfs->z_log != NULL)
+ zil_commit(zfsvfs->z_log, zp->z_id);
+ ZFS_EXIT(zfsvfs);
+
+ /*
+ * 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);
}
/*
static int
zpl_writepage(struct page *pp, struct writeback_control *wbc)
{
- return zpl_putpage(pp, wbc, pp->mapping);
+ if (ITOZSB(pp->mapping->host)->z_os->os_sync == ZFS_SYNC_ALWAYS)
+ wbc->sync_mode = WB_SYNC_ALL;
+
+ return (zpl_putpage(pp, wbc, pp->mapping));
+}
+
+/*
+ * 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;
+
+#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;
+
+ if (mode != (FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
+ return (error);
+
+ if (offset < 0 || len <= 0)
+ return (-EINVAL);
+
+ 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 = SEEK_SET;
+ 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) */
+
+ 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 */
+
+#define ZFS_FL_USER_VISIBLE (FS_FL_USER_VISIBLE | ZFS_PROJINHERIT_FL)
+#define ZFS_FL_USER_MODIFIABLE (FS_FL_USER_MODIFIABLE | ZFS_PROJINHERIT_FL)
+
+static uint32_t
+__zpl_ioctl_getflags(struct inode *ip)
+{
+ uint64_t zfs_flags = ITOZ(ip)->z_pflags;
+ uint32_t ioctl_flags = 0;
+
+ 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;
+
+ if (zfs_flags & ZFS_PROJINHERIT)
+ ioctl_flags |= ZFS_PROJINHERIT_FL;
+
+ return (ioctl_flags & ZFS_FL_USER_VISIBLE);
+}
+
+/*
+ * 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)
+{
+ uint32_t flags;
+ int err;
+
+ flags = __zpl_ioctl_getflags(file_inode(filp));
+ err = copy_to_user(arg, &flags, sizeof (flags));
+
+ return (err);
+}
+
+/*
+ * 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)) != !((f1) & (b1)))
+
+static int
+__zpl_ioctl_setflags(struct inode *ip, uint32_t ioctl_flags, xvattr_t *xva)
+{
+ uint64_t zfs_flags = ITOZ(ip)->z_pflags;
+ xoptattr_t *xoap;
+
+ if (ioctl_flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | FS_NODUMP_FL |
+ ZFS_PROJINHERIT_FL))
+ return (-EOPNOTSUPP);
+
+ if (ioctl_flags & ~ZFS_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;
+
+ XVA_SET_REQ(xva, XAT_PROJINHERIT);
+ if (ioctl_flags & ZFS_PROJINHERIT_FL)
+ xoap->xoa_projinherit = B_TRUE;
+
+ return (0);
}
+static int
+zpl_ioctl_setflags(struct file *filp, void __user *arg)
+{
+ struct inode *ip = file_inode(filp);
+ uint32_t flags;
+ cred_t *cr = CRED();
+ xvattr_t xva;
+ int err;
+ fstrans_cookie_t cookie;
+
+ if (copy_from_user(&flags, arg, sizeof (flags)))
+ return (-EFAULT);
+
+ err = __zpl_ioctl_setflags(ip, flags, &xva);
+ if (err)
+ return (err);
+
+ crhold(cr);
+ cookie = spl_fstrans_mark();
+ err = -zfs_setattr(ip, (vattr_t *)&xva, 0, cr);
+ spl_fstrans_unmark(cookie);
+ crfree(cr);
+
+ return (err);
+}
+
+static int
+zpl_ioctl_getxattr(struct file *filp, void __user *arg)
+{
+ zfsxattr_t fsx = { 0 };
+ struct inode *ip = file_inode(filp);
+ int err;
+
+ fsx.fsx_xflags = __zpl_ioctl_getflags(ip);
+ fsx.fsx_projid = ITOZ(ip)->z_projid;
+ err = copy_to_user(arg, &fsx, sizeof (fsx));
+
+ return (err);
+}
+
+static int
+zpl_ioctl_setxattr(struct file *filp, void __user *arg)
+{
+ struct inode *ip = file_inode(filp);
+ zfsxattr_t fsx;
+ cred_t *cr = CRED();
+ xvattr_t xva;
+ xoptattr_t *xoap;
+ int err;
+ fstrans_cookie_t cookie;
+
+ if (copy_from_user(&fsx, arg, sizeof (fsx)))
+ return (-EFAULT);
+
+ if (!zpl_is_valid_projid(fsx.fsx_projid))
+ return (-EINVAL);
+
+ err = __zpl_ioctl_setflags(ip, fsx.fsx_xflags, &xva);
+ if (err)
+ return (err);
+
+ xoap = xva_getxoptattr(&xva);
+ XVA_SET_REQ(&xva, XAT_PROJID);
+ xoap->xoa_projid = fsx.fsx_projid;
+
+ crhold(cr);
+ cookie = spl_fstrans_mark();
+ err = -zfs_setattr(ip, (vattr_t *)&xva, 0, cr);
+ spl_fstrans_unmark(cookie);
+ crfree(cr);
+
+ return (err);
+}
+
+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));
+ case ZFS_IOC_FSGETXATTR:
+ return (zpl_ioctl_getxattr(filp, (void *)arg));
+ case ZFS_IOC_FSSETXATTR:
+ return (zpl_ioctl_setxattr(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,
+ .writepages = zpl_writepages,
+ .direct_IO = zpl_direct_IO,
};
const struct file_operations zpl_file_operations = {
.open = zpl_open,
.release = zpl_release,
- .llseek = generic_file_llseek,
- .read = zpl_read,
- .write = zpl_write,
- .readdir = zpl_readdir,
+ .llseek = zpl_llseek,
+#ifdef HAVE_VFS_RW_ITERATE
+#ifdef HAVE_NEW_SYNC_READ
+ .read = new_sync_read,
+ .write = new_sync_write,
+#endif
+ .read_iter = zpl_iter_read,
+ .write_iter = zpl_iter_write,
+#else
+ .read = do_sync_read,
+ .write = do_sync_write,
+ .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,
+#if defined(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
};