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Diffstat (limited to 'fs/btrfs/file.c')
-rw-r--r--fs/btrfs/file.c114
1 files changed, 62 insertions, 52 deletions
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 4b833972273..06550affbd2 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -112,8 +112,6 @@ static noinline int dirty_and_release_pages(struct btrfs_trans_handle *trans,
int err = 0;
int i;
struct inode *inode = fdentry(file)->d_inode;
- struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
- u64 hint_byte;
u64 num_bytes;
u64 start_pos;
u64 end_of_last_block;
@@ -125,23 +123,10 @@ static noinline int dirty_and_release_pages(struct btrfs_trans_handle *trans,
root->sectorsize - 1) & ~((u64)root->sectorsize - 1);
end_of_last_block = start_pos + num_bytes - 1;
+ err = btrfs_set_extent_delalloc(inode, start_pos, end_of_last_block);
+ if (err)
+ return err;
- lock_extent(io_tree, start_pos, end_of_last_block, GFP_NOFS);
- trans = btrfs_join_transaction(root, 1);
- if (!trans) {
- err = -ENOMEM;
- goto out_unlock;
- }
- btrfs_set_trans_block_group(trans, inode);
- hint_byte = 0;
-
- set_extent_uptodate(io_tree, start_pos, end_of_last_block, GFP_NOFS);
-
- /* check for reserved extents on each page, we don't want
- * to reset the delalloc bit on things that already have
- * extents reserved.
- */
- btrfs_set_extent_delalloc(inode, start_pos, end_of_last_block);
for (i = 0; i < num_pages; i++) {
struct page *p = pages[i];
SetPageUptodate(p);
@@ -155,9 +140,6 @@ static noinline int dirty_and_release_pages(struct btrfs_trans_handle *trans,
* at this time.
*/
}
- err = btrfs_end_transaction(trans, root);
-out_unlock:
- unlock_extent(io_tree, start_pos, end_of_last_block, GFP_NOFS);
return err;
}
@@ -189,18 +171,18 @@ int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
if (!split2)
split2 = alloc_extent_map(GFP_NOFS);
- spin_lock(&em_tree->lock);
+ write_lock(&em_tree->lock);
em = lookup_extent_mapping(em_tree, start, len);
if (!em) {
- spin_unlock(&em_tree->lock);
+ write_unlock(&em_tree->lock);
break;
}
flags = em->flags;
if (skip_pinned && test_bit(EXTENT_FLAG_PINNED, &em->flags)) {
- spin_unlock(&em_tree->lock);
if (em->start <= start &&
(!testend || em->start + em->len >= start + len)) {
free_extent_map(em);
+ write_unlock(&em_tree->lock);
break;
}
if (start < em->start) {
@@ -210,6 +192,7 @@ int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
start = em->start + em->len;
}
free_extent_map(em);
+ write_unlock(&em_tree->lock);
continue;
}
compressed = test_bit(EXTENT_FLAG_COMPRESSED, &em->flags);
@@ -260,7 +243,7 @@ int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
free_extent_map(split);
split = NULL;
}
- spin_unlock(&em_tree->lock);
+ write_unlock(&em_tree->lock);
/* once for us */
free_extent_map(em);
@@ -289,7 +272,7 @@ int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
noinline int btrfs_drop_extents(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct inode *inode,
u64 start, u64 end, u64 locked_end,
- u64 inline_limit, u64 *hint_byte)
+ u64 inline_limit, u64 *hint_byte, int drop_cache)
{
u64 extent_end = 0;
u64 search_start = start;
@@ -314,7 +297,8 @@ noinline int btrfs_drop_extents(struct btrfs_trans_handle *trans,
int ret;
inline_limit = 0;
- btrfs_drop_extent_cache(inode, start, end - 1, 0);
+ if (drop_cache)
+ btrfs_drop_extent_cache(inode, start, end - 1, 0);
path = btrfs_alloc_path();
if (!path)
@@ -894,7 +878,8 @@ again:
btrfs_put_ordered_extent(ordered);
clear_extent_bits(&BTRFS_I(inode)->io_tree, start_pos,
- last_pos - 1, EXTENT_DIRTY | EXTENT_DELALLOC,
+ last_pos - 1, EXTENT_DIRTY | EXTENT_DELALLOC |
+ EXTENT_DO_ACCOUNTING,
GFP_NOFS);
unlock_extent(&BTRFS_I(inode)->io_tree,
start_pos, last_pos - 1, GFP_NOFS);
@@ -936,21 +921,35 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
start_pos = pos;
vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
+
+ /* do the reserve before the mutex lock in case we have to do some
+ * flushing. We wouldn't deadlock, but this is more polite.
+ */
+ err = btrfs_reserve_metadata_for_delalloc(root, inode, 1);
+ if (err)
+ goto out_nolock;
+
+ mutex_lock(&inode->i_mutex);
+
current->backing_dev_info = inode->i_mapping->backing_dev_info;
err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
if (err)
- goto out_nolock;
+ goto out;
+
if (count == 0)
- goto out_nolock;
+ goto out;
err = file_remove_suid(file);
if (err)
- goto out_nolock;
+ goto out;
+
file_update_time(file);
pages = kmalloc(nrptrs * sizeof(struct page *), GFP_KERNEL);
- mutex_lock(&inode->i_mutex);
+ /* generic_write_checks can change our pos */
+ start_pos = pos;
+
BTRFS_I(inode)->sequence++;
first_index = pos >> PAGE_CACHE_SHIFT;
last_index = (pos + count) >> PAGE_CACHE_SHIFT;
@@ -1024,9 +1023,8 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
}
if (will_write) {
- btrfs_fdatawrite_range(inode->i_mapping, pos,
- pos + write_bytes - 1,
- WB_SYNC_ALL);
+ filemap_fdatawrite_range(inode->i_mapping, pos,
+ pos + write_bytes - 1);
} else {
balance_dirty_pages_ratelimited_nr(inode->i_mapping,
num_pages);
@@ -1047,6 +1045,7 @@ out:
mutex_unlock(&inode->i_mutex);
if (ret)
err = ret;
+ btrfs_unreserve_metadata_for_delalloc(root, inode, 1);
out_nolock:
kfree(pages);
@@ -1087,8 +1086,10 @@ out_nolock:
btrfs_end_transaction(trans, root);
else
btrfs_commit_transaction(trans, root);
- } else {
+ } else if (ret != BTRFS_NO_LOG_SYNC) {
btrfs_commit_transaction(trans, root);
+ } else {
+ btrfs_end_transaction(trans, root);
}
}
if (file->f_flags & O_DIRECT) {
@@ -1138,6 +1139,13 @@ int btrfs_sync_file(struct file *file, struct dentry *dentry, int datasync)
int ret = 0;
struct btrfs_trans_handle *trans;
+
+ /* we wait first, since the writeback may change the inode */
+ root->log_batch++;
+ /* the VFS called filemap_fdatawrite for us */
+ btrfs_wait_ordered_range(inode, 0, (u64)-1);
+ root->log_batch++;
+
/*
* check the transaction that last modified this inode
* and see if its already been committed
@@ -1145,6 +1153,11 @@ int btrfs_sync_file(struct file *file, struct dentry *dentry, int datasync)
if (!BTRFS_I(inode)->last_trans)
goto out;
+ /*
+ * if the last transaction that changed this file was before
+ * the current transaction, we can bail out now without any
+ * syncing
+ */
mutex_lock(&root->fs_info->trans_mutex);
if (BTRFS_I(inode)->last_trans <=
root->fs_info->last_trans_committed) {
@@ -1154,13 +1167,6 @@ int btrfs_sync_file(struct file *file, struct dentry *dentry, int datasync)
}
mutex_unlock(&root->fs_info->trans_mutex);
- root->log_batch++;
- filemap_fdatawrite(inode->i_mapping);
- btrfs_wait_ordered_range(inode, 0, (u64)-1);
- root->log_batch++;
-
- if (datasync && !(inode->i_state & I_DIRTY_PAGES))
- goto out;
/*
* ok we haven't committed the transaction yet, lets do a commit
*/
@@ -1189,21 +1195,25 @@ int btrfs_sync_file(struct file *file, struct dentry *dentry, int datasync)
*/
mutex_unlock(&dentry->d_inode->i_mutex);
- if (ret > 0) {
- ret = btrfs_commit_transaction(trans, root);
- } else {
- ret = btrfs_sync_log(trans, root);
- if (ret == 0)
- ret = btrfs_end_transaction(trans, root);
- else
+ if (ret != BTRFS_NO_LOG_SYNC) {
+ if (ret > 0) {
ret = btrfs_commit_transaction(trans, root);
+ } else {
+ ret = btrfs_sync_log(trans, root);
+ if (ret == 0)
+ ret = btrfs_end_transaction(trans, root);
+ else
+ ret = btrfs_commit_transaction(trans, root);
+ }
+ } else {
+ ret = btrfs_end_transaction(trans, root);
}
mutex_lock(&dentry->d_inode->i_mutex);
out:
return ret > 0 ? EIO : ret;
}
-static struct vm_operations_struct btrfs_file_vm_ops = {
+static const struct vm_operations_struct btrfs_file_vm_ops = {
.fault = filemap_fault,
.page_mkwrite = btrfs_page_mkwrite,
};
@@ -1215,7 +1225,7 @@ static int btrfs_file_mmap(struct file *filp, struct vm_area_struct *vma)
return 0;
}
-struct file_operations btrfs_file_operations = {
+const struct file_operations btrfs_file_operations = {
.llseek = generic_file_llseek,
.read = do_sync_read,
.aio_read = generic_file_aio_read,
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-18 10:48:15 +0000