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-rw-r--r--fs/ext3/inode.c160
1 files changed, 90 insertions, 70 deletions
diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c
index 5fa453b49a6..466a332e0bd 100644
--- a/fs/ext3/inode.c
+++ b/fs/ext3/inode.c
@@ -1149,12 +1149,15 @@ static int ext3_write_begin(struct file *file, struct address_space *mapping,
struct page **pagep, void **fsdata)
{
struct inode *inode = mapping->host;
- int ret, needed_blocks = ext3_writepage_trans_blocks(inode);
+ int ret;
handle_t *handle;
int retries = 0;
struct page *page;
pgoff_t index;
unsigned from, to;
+ /* Reserve one block more for addition to orphan list in case
+ * we allocate blocks but write fails for some reason */
+ int needed_blocks = ext3_writepage_trans_blocks(inode) + 1;
index = pos >> PAGE_CACHE_SHIFT;
from = pos & (PAGE_CACHE_SIZE - 1);
@@ -1184,15 +1187,20 @@ retry:
}
write_begin_failed:
if (ret) {
- ext3_journal_stop(handle);
- unlock_page(page);
- page_cache_release(page);
/*
* block_write_begin may have instantiated a few blocks
* outside i_size. Trim these off again. Don't need
* i_size_read because we hold i_mutex.
+ *
+ * Add inode to orphan list in case we crash before truncate
+ * finishes.
*/
if (pos + len > inode->i_size)
+ ext3_orphan_add(handle, inode);
+ ext3_journal_stop(handle);
+ unlock_page(page);
+ page_cache_release(page);
+ if (pos + len > inode->i_size)
vmtruncate(inode, inode->i_size);
}
if (ret == -ENOSPC && ext3_should_retry_alloc(inode->i_sb, &retries))
@@ -1211,6 +1219,18 @@ int ext3_journal_dirty_data(handle_t *handle, struct buffer_head *bh)
return err;
}
+/* For ordered writepage and write_end functions */
+static int journal_dirty_data_fn(handle_t *handle, struct buffer_head *bh)
+{
+ /*
+ * Write could have mapped the buffer but it didn't copy the data in
+ * yet. So avoid filing such buffer into a transaction.
+ */
+ if (buffer_mapped(bh) && buffer_uptodate(bh))
+ return ext3_journal_dirty_data(handle, bh);
+ return 0;
+}
+
/* For write_end() in data=journal mode */
static int write_end_fn(handle_t *handle, struct buffer_head *bh)
{
@@ -1221,26 +1241,20 @@ static int write_end_fn(handle_t *handle, struct buffer_head *bh)
}
/*
- * Generic write_end handler for ordered and writeback ext3 journal modes.
- * We can't use generic_write_end, because that unlocks the page and we need to
- * unlock the page after ext3_journal_stop, but ext3_journal_stop must run
- * after block_write_end.
+ * This is nasty and subtle: ext3_write_begin() could have allocated blocks
+ * for the whole page but later we failed to copy the data in. Update inode
+ * size according to what we managed to copy. The rest is going to be
+ * truncated in write_end function.
*/
-static int ext3_generic_write_end(struct file *file,
- struct address_space *mapping,
- loff_t pos, unsigned len, unsigned copied,
- struct page *page, void *fsdata)
+static void update_file_sizes(struct inode *inode, loff_t pos, unsigned copied)
{
- struct inode *inode = file->f_mapping->host;
-
- copied = block_write_end(file, mapping, pos, len, copied, page, fsdata);
-
- if (pos+copied > inode->i_size) {
- i_size_write(inode, pos+copied);
+ /* What matters to us is i_disksize. We don't write i_size anywhere */
+ if (pos + copied > inode->i_size)
+ i_size_write(inode, pos + copied);
+ if (pos + copied > EXT3_I(inode)->i_disksize) {
+ EXT3_I(inode)->i_disksize = pos + copied;
mark_inode_dirty(inode);
}
-
- return copied;
}
/*
@@ -1260,35 +1274,29 @@ static int ext3_ordered_write_end(struct file *file,
unsigned from, to;
int ret = 0, ret2;
- from = pos & (PAGE_CACHE_SIZE - 1);
- to = from + len;
+ copied = block_write_end(file, mapping, pos, len, copied, page, fsdata);
+ from = pos & (PAGE_CACHE_SIZE - 1);
+ to = from + copied;
ret = walk_page_buffers(handle, page_buffers(page),
- from, to, NULL, ext3_journal_dirty_data);
+ from, to, NULL, journal_dirty_data_fn);
- if (ret == 0) {
- /*
- * generic_write_end() will run mark_inode_dirty() if i_size
- * changes. So let's piggyback the i_disksize mark_inode_dirty
- * into that.
- */
- loff_t new_i_size;
-
- new_i_size = pos + copied;
- if (new_i_size > EXT3_I(inode)->i_disksize)
- EXT3_I(inode)->i_disksize = new_i_size;
- ret2 = ext3_generic_write_end(file, mapping, pos, len, copied,
- page, fsdata);
- copied = ret2;
- if (ret2 < 0)
- ret = ret2;
- }
+ if (ret == 0)
+ update_file_sizes(inode, pos, copied);
+ /*
+ * There may be allocated blocks outside of i_size because
+ * we failed to copy some data. Prepare for truncate.
+ */
+ if (pos + len > inode->i_size)
+ ext3_orphan_add(handle, inode);
ret2 = ext3_journal_stop(handle);
if (!ret)
ret = ret2;
unlock_page(page);
page_cache_release(page);
+ if (pos + len > inode->i_size)
+ vmtruncate(inode, inode->i_size);
return ret ? ret : copied;
}
@@ -1299,25 +1307,22 @@ static int ext3_writeback_write_end(struct file *file,
{
handle_t *handle = ext3_journal_current_handle();
struct inode *inode = file->f_mapping->host;
- int ret = 0, ret2;
- loff_t new_i_size;
-
- new_i_size = pos + copied;
- if (new_i_size > EXT3_I(inode)->i_disksize)
- EXT3_I(inode)->i_disksize = new_i_size;
-
- ret2 = ext3_generic_write_end(file, mapping, pos, len, copied,
- page, fsdata);
- copied = ret2;
- if (ret2 < 0)
- ret = ret2;
+ int ret;
- ret2 = ext3_journal_stop(handle);
- if (!ret)
- ret = ret2;
+ copied = block_write_end(file, mapping, pos, len, copied, page, fsdata);
+ update_file_sizes(inode, pos, copied);
+ /*
+ * There may be allocated blocks outside of i_size because
+ * we failed to copy some data. Prepare for truncate.
+ */
+ if (pos + len > inode->i_size)
+ ext3_orphan_add(handle, inode);
+ ret = ext3_journal_stop(handle);
unlock_page(page);
page_cache_release(page);
+ if (pos + len > inode->i_size)
+ vmtruncate(inode, inode->i_size);
return ret ? ret : copied;
}
@@ -1338,15 +1343,23 @@ static int ext3_journalled_write_end(struct file *file,
if (copied < len) {
if (!PageUptodate(page))
copied = 0;
- page_zero_new_buffers(page, from+copied, to);
+ page_zero_new_buffers(page, from + copied, to);
+ to = from + copied;
}
ret = walk_page_buffers(handle, page_buffers(page), from,
to, &partial, write_end_fn);
if (!partial)
SetPageUptodate(page);
- if (pos+copied > inode->i_size)
- i_size_write(inode, pos+copied);
+
+ if (pos + copied > inode->i_size)
+ i_size_write(inode, pos + copied);
+ /*
+ * There may be allocated blocks outside of i_size because
+ * we failed to copy some data. Prepare for truncate.
+ */
+ if (pos + len > inode->i_size)
+ ext3_orphan_add(handle, inode);
EXT3_I(inode)->i_state |= EXT3_STATE_JDATA;
if (inode->i_size > EXT3_I(inode)->i_disksize) {
EXT3_I(inode)->i_disksize = inode->i_size;
@@ -1361,6 +1374,8 @@ static int ext3_journalled_write_end(struct file *file,
unlock_page(page);
page_cache_release(page);
+ if (pos + len > inode->i_size)
+ vmtruncate(inode, inode->i_size);
return ret ? ret : copied;
}
@@ -1428,11 +1443,9 @@ static int bput_one(handle_t *handle, struct buffer_head *bh)
return 0;
}
-static int journal_dirty_data_fn(handle_t *handle, struct buffer_head *bh)
+static int buffer_unmapped(handle_t *handle, struct buffer_head *bh)
{
- if (buffer_mapped(bh))
- return ext3_journal_dirty_data(handle, bh);
- return 0;
+ return !buffer_mapped(bh);
}
/*
@@ -1505,6 +1518,15 @@ static int ext3_ordered_writepage(struct page *page,
if (ext3_journal_current_handle())
goto out_fail;
+ if (!page_has_buffers(page)) {
+ create_empty_buffers(page, inode->i_sb->s_blocksize,
+ (1 << BH_Dirty)|(1 << BH_Uptodate));
+ } else if (!walk_page_buffers(NULL, page_buffers(page), 0, PAGE_CACHE_SIZE, NULL, buffer_unmapped)) {
+ /* Provide NULL instead of get_block so that we catch bugs if buffers weren't really mapped */
+ return block_write_full_page(page, NULL, wbc);
+ }
+ page_bufs = page_buffers(page);
+
handle = ext3_journal_start(inode, ext3_writepage_trans_blocks(inode));
if (IS_ERR(handle)) {
@@ -1512,11 +1534,6 @@ static int ext3_ordered_writepage(struct page *page,
goto out_fail;
}
- if (!page_has_buffers(page)) {
- create_empty_buffers(page, inode->i_sb->s_blocksize,
- (1 << BH_Dirty)|(1 << BH_Uptodate));
- }
- page_bufs = page_buffers(page);
walk_page_buffers(handle, page_bufs, 0,
PAGE_CACHE_SIZE, NULL, bget_one);
@@ -2346,6 +2363,9 @@ void ext3_truncate(struct inode *inode)
if (!ext3_can_truncate(inode))
return;
+ if (inode->i_size == 0 && ext3_should_writeback_data(inode))
+ ei->i_state |= EXT3_STATE_FLUSH_ON_CLOSE;
+
/*
* We have to lock the EOF page here, because lock_page() nests
* outside journal_start().
@@ -3055,7 +3075,7 @@ int ext3_setattr(struct dentry *dentry, struct iattr *attr)
error = PTR_ERR(handle);
goto err_out;
}
- error = DQUOT_TRANSFER(inode, attr) ? -EDQUOT : 0;
+ error = vfs_dq_transfer(inode, attr) ? -EDQUOT : 0;
if (error) {
ext3_journal_stop(handle);
return error;
@@ -3146,7 +3166,7 @@ static int ext3_writepage_trans_blocks(struct inode *inode)
ret = 2 * (bpp + indirects) + 2;
#ifdef CONFIG_QUOTA
- /* We know that structure was already allocated during DQUOT_INIT so
+ /* We know that structure was already allocated during vfs_dq_init so
* we will be updating only the data blocks + inodes */
ret += 2*EXT3_QUOTA_TRANS_BLOCKS(inode->i_sb);
#endif
@@ -3237,7 +3257,7 @@ int ext3_mark_inode_dirty(handle_t *handle, struct inode *inode)
* i_size has been changed by generic_commit_write() and we thus need
* to include the updated inode in the current transaction.
*
- * Also, DQUOT_ALLOC_SPACE() will always dirty the inode when blocks
+ * Also, vfs_dq_alloc_space() will always dirty the inode when blocks
* are allocated to the file.
*
* If the inode is marked synchronous, we don't honour that here - doing
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-29 06:16:37 +0000