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Message-Id: <1321893597-11024-4-git-send-email-tm@tao.ma>
Date: Tue, 22 Nov 2011 00:39:42 +0800
From: Tao Ma <tm@....ma>
To: linux-ext4@...r.kernel.org
Cc: tytso@....edu, linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org, adilger@...ger.ca
Subject: [PATCH V2 04/19] ext4: Add read support for inline data.
From: Tao Ma <boyu.mt@...bao.com>
Let readpage and readpages handle the case when we
want to read an inlined file.
Signed-off-by: Tao Ma <boyu.mt@...bao.comc.
---
fs/ext4/inline.c | 53 ++++++++++++++++++++++++++++++++++++++++++++++-------
fs/ext4/inode.c | 25 +++++++++++++++++++++++++
fs/ext4/xattr.h | 7 +++++++
3 files changed, 78 insertions(+), 7 deletions(-)
diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c
index d3aa377..fa8f554 100644
--- a/fs/ext4/inline.c
+++ b/fs/ext4/inline.c
@@ -163,12 +163,6 @@ int ext4_read_inline_data(struct inode *inode, void *buffer, unsigned int len)
if (error)
return error;
- down_read(&EXT4_I(inode)->xattr_sem);
- if(!EXT4_I(inode)->i_inline_off) {
- ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
- inode->i_ino);
- goto out;
- }
BUG_ON(len > EXT4_I(inode)->i_inline_size);
@@ -193,7 +187,6 @@ int ext4_read_inline_data(struct inode *inode, void *buffer, unsigned int len)
cp_len += len;
out:
- up_read(&EXT4_I(inode)->xattr_sem);
brelse(iloc.bh);
return cp_len;
}
@@ -447,6 +440,52 @@ out:
return error;
}
+static int ext4_read_inline_page(struct inode *inode, struct page *page)
+{
+ void *kaddr;
+ loff_t size;
+ int ret = 0;
+
+ BUG_ON(!PageLocked(page));
+ BUG_ON(!ext4_has_inline_data(inode));
+
+ size = i_size_read(inode);
+
+ if (size > PAGE_CACHE_SIZE ||
+ size > ext4_get_inline_size(inode)) {
+ ext4_error_inode(inode, __func__, __LINE__, 0,
+ "bad size %ld for a inline file", (long)size);
+ return -EROFS;
+ }
+
+ down_read(&EXT4_I(inode)->xattr_sem);
+ if(!EXT4_I(inode)->i_inline_off) {
+ ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
+ inode->i_ino);
+ goto out;
+ }
+
+ kaddr = kmap_atomic(page, KM_USER0);
+ ret = ext4_read_inline_data(inode, kaddr, size);
+ flush_dcache_page(page);
+ kunmap_atomic(kaddr, KM_USER0);
+ SetPageUptodate(page);
+
+out:
+ up_read(&EXT4_I(inode)->xattr_sem);
+ return ret;
+}
+
+int ext4_readpage_inline(struct inode *inode, struct page *page)
+{
+ int ret;
+
+ ret = ext4_read_inline_page(inode, page);
+
+ unlock_page(page);
+ return ret;
+}
+
int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
{
int ret;
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 9b1fbf5..4f764b7 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -592,6 +592,9 @@ static int _ext4_get_block(struct inode *inode, sector_t iblock,
int ret = 0, started = 0;
int dio_credits;
+ if (ext4_has_inline_data(inode))
+ return -ERANGE;
+
map.m_lblk = iblock;
map.m_len = bh->b_size >> inode->i_blkbits;
@@ -2633,6 +2636,12 @@ static sector_t ext4_bmap(struct address_space *mapping, sector_t block)
journal_t *journal;
int err;
+ /*
+ * XXX: Can we arrive here for a inline file? Maybe not.
+ */
+ if (ext4_has_inline_data(inode))
+ return 0;
+
if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY) &&
test_opt(inode->i_sb, DELALLOC)) {
/*
@@ -2678,7 +2687,13 @@ static sector_t ext4_bmap(struct address_space *mapping, sector_t block)
static int ext4_readpage(struct file *file, struct page *page)
{
+ struct inode *inode = file->f_mapping->host;
+
trace_ext4_readpage(page);
+
+ if (ext4_has_inline_data(inode))
+ return ext4_readpage_inline(inode, page);
+
return mpage_readpage(page, ext4_get_block);
}
@@ -2686,6 +2701,12 @@ static int
ext4_readpages(struct file *file, struct address_space *mapping,
struct list_head *pages, unsigned nr_pages)
{
+ struct inode *inode = mapping->host;
+
+ /* If the file has inline data, no need to do readpages. */
+ if (ext4_has_inline_data(inode))
+ return 0;
+
return mpage_readpages(mapping, pages, nr_pages, ext4_get_block);
}
@@ -3007,6 +3028,10 @@ static ssize_t ext4_direct_IO(int rw, struct kiocb *iocb,
if (ext4_should_journal_data(inode))
return 0;
+ /* Let buffer I/O handle the inline data case. */
+ if (ext4_has_inline_data(inode))
+ return 0;
+
trace_ext4_direct_IO_enter(inode, offset, iov_length(iov, nr_segs), rw);
if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
ret = ext4_ext_direct_IO(rw, iocb, iov, offset, nr_segs);
diff --git a/fs/ext4/xattr.h b/fs/ext4/xattr.h
index e436d33..129ead1 100644
--- a/fs/ext4/xattr.h
+++ b/fs/ext4/xattr.h
@@ -139,6 +139,8 @@ extern int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
unsigned int len);
extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
+
+extern int ext4_readpage_inline(struct inode *inode, struct page *page);
# else /* CONFIG_EXT4_FS_XATTR */
static inline int
@@ -260,6 +262,11 @@ static inline int ext4_destroy_inline_data(handle_t *handle,
{
return 0;
}
+
+static inline int ext4_readpage_inline(struct inode *inode, struct page *page)
+{
+ return 0;
+}
# endif /* CONFIG_EXT4_FS_XATTR */
#ifdef CONFIG_EXT4_FS_SECURITY
--
1.7.0.4
--
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