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authorAllison Henderson <achender@linux.vnet.ibm.com>2011-05-25 07:41:32 -0400
committerTheodore Ts'o <tytso@mit.edu>2011-05-25 07:41:32 -0400
commit308488518dfcbe3be250085cd582f5b0c1ce72a9 (patch)
tree4696b50debf9794f2cbb966cccbedadb93dc996a /fs/ext4
parent55f020db66ce187fb8c8e4002a94b0eb714da450 (diff)
downloadop-kernel-dev-308488518dfcbe3be250085cd582f5b0c1ce72a9.zip
op-kernel-dev-308488518dfcbe3be250085cd582f5b0c1ce72a9.tar.gz
ext4: add new function ext4_block_zero_page_range()
This patch modifies the existing ext4_block_truncate_page() function which was used by the truncate code path, and which zeroes out block unaligned data, by adding a new length parameter, and renames it to ext4_block_zero_page_rage(). This function can now be used to zero out the head of a block, the tail of a block, or the middle of a block. The ext4_block_truncate_page() function is now a wrapper to ext4_block_zero_page_range(). [ext4 punch hole patch series 2/5 v7] Signed-off-by: Allison Henderson <achender@us.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Reviewed-by: Mingming Cao <cmm@us.ibm.com>
Diffstat (limited to 'fs/ext4')
-rw-r--r--fs/ext4/ext4.h2
-rw-r--r--fs/ext4/inode.c33
2 files changed, 33 insertions, 2 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 2f310d1..c48f9db 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1825,6 +1825,8 @@ extern int ext4_writepage_trans_blocks(struct inode *);
extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
extern int ext4_block_truncate_page(handle_t *handle,
struct address_space *mapping, loff_t from);
+extern int ext4_block_zero_page_range(handle_t *handle,
+ struct address_space *mapping, loff_t from, loff_t length);
extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
extern qsize_t *ext4_get_reserved_space(struct inode *inode);
extern void ext4_da_update_reserve_space(struct inode *inode,
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index aef864b..fbe11e6 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3914,9 +3914,30 @@ void ext4_set_aops(struct inode *inode)
int ext4_block_truncate_page(handle_t *handle,
struct address_space *mapping, loff_t from)
{
+ unsigned offset = from & (PAGE_CACHE_SIZE-1);
+ unsigned length;
+ unsigned blocksize;
+ struct inode *inode = mapping->host;
+
+ blocksize = inode->i_sb->s_blocksize;
+ length = blocksize - (offset & (blocksize - 1));
+
+ return ext4_block_zero_page_range(handle, mapping, from, length);
+}
+
+/*
+ * ext4_block_zero_page_range() zeros out a mapping of length 'length'
+ * starting from file offset 'from'. The range to be zero'd must
+ * be contained with in one block. If the specified range exceeds
+ * the end of the block it will be shortened to end of the block
+ * that cooresponds to 'from'
+ */
+int ext4_block_zero_page_range(handle_t *handle,
+ struct address_space *mapping, loff_t from, loff_t length)
+{
ext4_fsblk_t index = from >> PAGE_CACHE_SHIFT;
unsigned offset = from & (PAGE_CACHE_SIZE-1);
- unsigned blocksize, length, pos;
+ unsigned blocksize, max, pos;
ext4_lblk_t iblock;
struct inode *inode = mapping->host;
struct buffer_head *bh;
@@ -3929,7 +3950,15 @@ int ext4_block_truncate_page(handle_t *handle,
return -EINVAL;
blocksize = inode->i_sb->s_blocksize;
- length = blocksize - (offset & (blocksize - 1));
+ max = blocksize - (offset & (blocksize - 1));
+
+ /*
+ * correct length if it does not fall between
+ * 'from' and the end of the block
+ */
+ if (length > max || length < 0)
+ length = max;
+
iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
if (!page_has_buffers(page))
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