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-rw-r--r--fs/ext4/file.c26
-rw-r--r--fs/ext4/inode.c35
-rw-r--r--fs/ext4/ioctl.c86
3 files changed, 83 insertions, 64 deletions
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index ad204d2724ac..a0ae27b1bc66 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -28,6 +28,7 @@
#include <linux/quotaops.h>
#include <linux/pagevec.h>
#include <linux/uio.h>
+#include <linux/mman.h>
#include "ext4.h"
#include "ext4_jbd2.h"
#include "xattr.h"
@@ -297,6 +298,7 @@ static int ext4_dax_huge_fault(struct vm_fault *vmf,
*/
bool write = (vmf->flags & FAULT_FLAG_WRITE) &&
(vmf->vma->vm_flags & VM_SHARED);
+ pfn_t pfn;
if (write) {
sb_start_pagefault(sb);
@@ -304,16 +306,20 @@ static int ext4_dax_huge_fault(struct vm_fault *vmf,
down_read(&EXT4_I(inode)->i_mmap_sem);
handle = ext4_journal_start_sb(sb, EXT4_HT_WRITE_PAGE,
EXT4_DATA_TRANS_BLOCKS(sb));
+ if (IS_ERR(handle)) {
+ up_read(&EXT4_I(inode)->i_mmap_sem);
+ sb_end_pagefault(sb);
+ return VM_FAULT_SIGBUS;
+ }
} else {
down_read(&EXT4_I(inode)->i_mmap_sem);
}
- if (!IS_ERR(handle))
- result = dax_iomap_fault(vmf, pe_size, &ext4_iomap_ops);
- else
- result = VM_FAULT_SIGBUS;
+ result = dax_iomap_fault(vmf, pe_size, &pfn, &ext4_iomap_ops);
if (write) {
- if (!IS_ERR(handle))
- ext4_journal_stop(handle);
+ ext4_journal_stop(handle);
+ /* Handling synchronous page fault? */
+ if (result & VM_FAULT_NEEDDSYNC)
+ result = dax_finish_sync_fault(vmf, pe_size, pfn);
up_read(&EXT4_I(inode)->i_mmap_sem);
sb_end_pagefault(sb);
} else {
@@ -351,6 +357,13 @@ static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma)
if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
return -EIO;
+ /*
+ * We don't support synchronous mappings for non-DAX files. At least
+ * until someone comes with a sensible use case.
+ */
+ if (!IS_DAX(file_inode(file)) && (vma->vm_flags & VM_SYNC))
+ return -EOPNOTSUPP;
+
file_accessed(file);
if (IS_DAX(file_inode(file))) {
vma->vm_ops = &ext4_dax_vm_ops;
@@ -469,6 +482,7 @@ const struct file_operations ext4_file_operations = {
.compat_ioctl = ext4_compat_ioctl,
#endif
.mmap = ext4_file_mmap,
+ .mmap_supported_flags = MAP_SYNC,
.open = ext4_file_open,
.release = ext4_release_file,
.fsync = ext4_sync_file,
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 2633150e41b9..0992d76f7ab1 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1719,7 +1719,7 @@ static void mpage_release_unused_pages(struct mpage_da_data *mpd,
ext4_es_remove_extent(inode, start, last - start + 1);
}
- pagevec_init(&pvec, 0);
+ pagevec_init(&pvec);
while (index <= end) {
nr_pages = pagevec_lookup_range(&pvec, mapping, &index, end);
if (nr_pages == 0)
@@ -2345,7 +2345,7 @@ static int mpage_map_and_submit_buffers(struct mpage_da_data *mpd)
lblk = start << bpp_bits;
pblock = mpd->map.m_pblk;
- pagevec_init(&pvec, 0);
+ pagevec_init(&pvec);
while (start <= end) {
nr_pages = pagevec_lookup_range(&pvec, inode->i_mapping,
&start, end);
@@ -2616,12 +2616,12 @@ static int mpage_prepare_extent_to_map(struct mpage_da_data *mpd)
else
tag = PAGECACHE_TAG_DIRTY;
- pagevec_init(&pvec, 0);
+ pagevec_init(&pvec);
mpd->map.m_len = 0;
mpd->next_page = index;
while (index <= end) {
- nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag,
- min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1);
+ nr_pages = pagevec_lookup_range_tag(&pvec, mapping, &index, end,
+ tag);
if (nr_pages == 0)
goto out;
@@ -2629,16 +2629,6 @@ static int mpage_prepare_extent_to_map(struct mpage_da_data *mpd)
struct page *page = pvec.pages[i];
/*
- * At this point, the page may be truncated or
- * invalidated (changing page->mapping to NULL), or
- * even swizzled back from swapper_space to tmpfs file
- * mapping. However, page->index will not change
- * because we have a reference on the page.
- */
- if (page->index > end)
- goto out;
-
- /*
* Accumulated enough dirty pages? This doesn't apply
* to WB_SYNC_ALL mode. For integrity sync we have to
* keep going because someone may be concurrently
@@ -3394,6 +3384,19 @@ static int ext4_releasepage(struct page *page, gfp_t wait)
return try_to_free_buffers(page);
}
+static bool ext4_inode_datasync_dirty(struct inode *inode)
+{
+ journal_t *journal = EXT4_SB(inode->i_sb)->s_journal;
+
+ if (journal)
+ return !jbd2_transaction_committed(journal,
+ EXT4_I(inode)->i_datasync_tid);
+ /* Any metadata buffers to write? */
+ if (!list_empty(&inode->i_mapping->private_list))
+ return true;
+ return inode->i_state & I_DIRTY_DATASYNC;
+}
+
static int ext4_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
unsigned flags, struct iomap *iomap)
{
@@ -3507,6 +3510,8 @@ retry:
}
iomap->flags = 0;
+ if (ext4_inode_datasync_dirty(inode))
+ iomap->flags |= IOMAP_F_DIRTY;
iomap->bdev = inode->i_sb->s_bdev;
iomap->dax_dev = sbi->s_daxdev;
iomap->offset = first_block << blkbits;
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index b7558f292420..1eec25014f62 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -592,6 +592,44 @@ static int ext4_ioc_getfsmap(struct super_block *sb,
return 0;
}
+static long ext4_ioctl_group_add(struct file *file,
+ struct ext4_new_group_data *input)
+{
+ struct super_block *sb = file_inode(file)->i_sb;
+ int err, err2=0;
+
+ err = ext4_resize_begin(sb);
+ if (err)
+ return err;
+
+ if (ext4_has_feature_bigalloc(sb)) {
+ ext4_msg(sb, KERN_ERR,
+ "Online resizing not supported with bigalloc");
+ err = -EOPNOTSUPP;
+ goto group_add_out;
+ }
+
+ err = mnt_want_write_file(file);
+ if (err)
+ goto group_add_out;
+
+ err = ext4_group_add(sb, input);
+ if (EXT4_SB(sb)->s_journal) {
+ jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
+ err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
+ jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
+ }
+ if (err == 0)
+ err = err2;
+ mnt_drop_write_file(file);
+ if (!err && ext4_has_group_desc_csum(sb) &&
+ test_opt(sb, INIT_INODE_TABLE))
+ err = ext4_register_li_request(sb, input->group);
+group_add_out:
+ ext4_resize_end(sb);
+ return err;
+}
+
long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
struct inode *inode = file_inode(filp);
@@ -776,44 +814,12 @@ mext_out:
case EXT4_IOC_GROUP_ADD: {
struct ext4_new_group_data input;
- int err, err2=0;
-
- err = ext4_resize_begin(sb);
- if (err)
- return err;
if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
- sizeof(input))) {
- err = -EFAULT;
- goto group_add_out;
- }
-
- if (ext4_has_feature_bigalloc(sb)) {
- ext4_msg(sb, KERN_ERR,
- "Online resizing not supported with bigalloc");
- err = -EOPNOTSUPP;
- goto group_add_out;
- }
-
- err = mnt_want_write_file(filp);
- if (err)
- goto group_add_out;
+ sizeof(input)))
+ return -EFAULT;
- err = ext4_group_add(sb, &input);
- if (EXT4_SB(sb)->s_journal) {
- jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
- err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
- jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
- }
- if (err == 0)
- err = err2;
- mnt_drop_write_file(filp);
- if (!err && ext4_has_group_desc_csum(sb) &&
- test_opt(sb, INIT_INODE_TABLE))
- err = ext4_register_li_request(sb, input.group);
-group_add_out:
- ext4_resize_end(sb);
- return err;
+ return ext4_ioctl_group_add(filp, &input);
}
case EXT4_IOC_MIGRATE:
@@ -1078,8 +1084,7 @@ long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
break;
case EXT4_IOC32_GROUP_ADD: {
struct compat_ext4_new_group_input __user *uinput;
- struct ext4_new_group_input input;
- mm_segment_t old_fs;
+ struct ext4_new_group_data input;
int err;
uinput = compat_ptr(arg);
@@ -1092,12 +1097,7 @@ long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
&uinput->reserved_blocks);
if (err)
return -EFAULT;
- old_fs = get_fs();
- set_fs(KERNEL_DS);
- err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD,
- (unsigned long) &input);
- set_fs(old_fs);
- return err;
+ return ext4_ioctl_group_add(file, &input);
}
case EXT4_IOC_MOVE_EXT:
case EXT4_IOC_RESIZE_FS:
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