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authorTheodore Ts'o <tytso@mit.edu>2010-05-16 20:00:00 -0400
committerTheodore Ts'o <tytso@mit.edu>2010-05-16 20:00:00 -0400
commit2ed886852adfcb070bf350e66a0da0d98b2f3ab5 (patch)
treebcec0a1004f413b70087e2c43097892f87f21cc3 /fs/ext4/dir.c
parente35fd6609b2fee54484d520deccb8f18bf7d38f3 (diff)
downloadop-kernel-dev-2ed886852adfcb070bf350e66a0da0d98b2f3ab5.zip
op-kernel-dev-2ed886852adfcb070bf350e66a0da0d98b2f3ab5.tar.gz
ext4: Convert callers of ext4_get_blocks() to use ext4_map_blocks()
This saves a huge amount of stack space by avoiding unnecesary struct buffer_head's from being allocated on the stack. In addition, to make the code easier to understand, collapse and refactor ext4_get_block(), ext4_get_block_write(), noalloc_get_block_write(), into a single function. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/dir.c')
-rw-r--r--fs/ext4/dir.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/fs/ext4/dir.c b/fs/ext4/dir.c
index 86cb6d8..e3f2700 100644
--- a/fs/ext4/dir.c
+++ b/fs/ext4/dir.c
@@ -128,14 +128,14 @@ static int ext4_readdir(struct file *filp,
offset = filp->f_pos & (sb->s_blocksize - 1);
while (!error && !stored && filp->f_pos < inode->i_size) {
- ext4_lblk_t blk = filp->f_pos >> EXT4_BLOCK_SIZE_BITS(sb);
- struct buffer_head map_bh;
+ struct ext4_map_blocks map;
struct buffer_head *bh = NULL;
- map_bh.b_state = 0;
- err = ext4_get_blocks(NULL, inode, blk, 1, &map_bh, 0);
+ map.m_lblk = filp->f_pos >> EXT4_BLOCK_SIZE_BITS(sb);
+ map.m_len = 1;
+ err = ext4_map_blocks(NULL, inode, &map, 0);
if (err > 0) {
- pgoff_t index = map_bh.b_blocknr >>
+ pgoff_t index = map.m_pblk >>
(PAGE_CACHE_SHIFT - inode->i_blkbits);
if (!ra_has_index(&filp->f_ra, index))
page_cache_sync_readahead(
@@ -143,7 +143,7 @@ static int ext4_readdir(struct file *filp,
&filp->f_ra, filp,
index, 1);
filp->f_ra.prev_pos = (loff_t)index << PAGE_CACHE_SHIFT;
- bh = ext4_bread(NULL, inode, blk, 0, &err);
+ bh = ext4_bread(NULL, inode, map.m_lblk, 0, &err);
}
/*
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