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Message-ID: <3ac55ceb-729c-52f9-1cfe-690a62be85ec@virtuozzo.com>
Date: Tue, 12 Mar 2019 16:09:06 +0300
From: Vasily Averin <vvs@...tuozzo.com>
To: Theodore Ts'o <tytso@....edu>,
Andreas Dilger <adilger.kernel@...ger.ca>,
linux-ext4@...r.kernel.org
Subject: [PATCH v3] ext4: remove code duplication in
update_ind/bind/tind_extent_range
update_ind/bind/tind_extent_page() differs by one variable and can be
replaced by unified function. These functions are called by similar way
and their caller function can be simplified too.
v2: minor style changes, thanks to Andreas Dilger
v3: rebase to v5.0
Signed-off-by: Vasily Averin <vvs@...tuozzo.com>
---
fs/ext4/migrate.c | 112 ++++++++++------------------------------------
1 file changed, 24 insertions(+), 88 deletions(-)
diff --git a/fs/ext4/migrate.c b/fs/ext4/migrate.c
index b1e4d359f73b..fde2f1bc96b0 100644
--- a/fs/ext4/migrate.c
+++ b/fs/ext4/migrate.c
@@ -109,12 +109,13 @@ static int update_extent_range(handle_t *handle, struct inode *inode,
static int update_ind_extent_range(handle_t *handle, struct inode *inode,
ext4_fsblk_t pblock,
- struct migrate_struct *lb)
+ struct migrate_struct *lb,
+ ext4_lblk_t inc)
{
struct buffer_head *bh;
__le32 *i_data;
int i, retval = 0;
- unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
+ ext4_lblk_t max_entries = inode->i_sb->s_blocksize >> 2;
bh = ext4_sb_bread(inode->i_sb, pblock, 0);
if (IS_ERR(bh))
@@ -128,67 +129,7 @@ static int update_ind_extent_range(handle_t *handle, struct inode *inode,
if (retval)
break;
} else {
- lb->curr_block++;
- }
- }
- put_bh(bh);
- return retval;
-
-}
-
-static int update_dind_extent_range(handle_t *handle, struct inode *inode,
- ext4_fsblk_t pblock,
- struct migrate_struct *lb)
-{
- struct buffer_head *bh;
- __le32 *i_data;
- int i, retval = 0;
- unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
-
- bh = ext4_sb_bread(inode->i_sb, pblock, 0);
- if (IS_ERR(bh))
- return PTR_ERR(bh);
-
- i_data = (__le32 *)bh->b_data;
- for (i = 0; i < max_entries; i++) {
- if (i_data[i]) {
- retval = update_ind_extent_range(handle, inode,
- le32_to_cpu(i_data[i]), lb);
- if (retval)
- break;
- } else {
- /* Only update the file block number */
- lb->curr_block += max_entries;
- }
- }
- put_bh(bh);
- return retval;
-
-}
-
-static int update_tind_extent_range(handle_t *handle, struct inode *inode,
- ext4_fsblk_t pblock,
- struct migrate_struct *lb)
-{
- struct buffer_head *bh;
- __le32 *i_data;
- int i, retval = 0;
- unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
-
- bh = ext4_sb_bread(inode->i_sb, pblock, 0);
- if (IS_ERR(bh))
- return PTR_ERR(bh);
-
- i_data = (__le32 *)bh->b_data;
- for (i = 0; i < max_entries; i++) {
- if (i_data[i]) {
- retval = update_dind_extent_range(handle, inode,
- le32_to_cpu(i_data[i]), lb);
- if (retval)
- break;
- } else {
- /* Only update the file block number */
- lb->curr_block += max_entries * max_entries;
+ lb->curr_block += inc;
}
}
put_bh(bh);
@@ -433,7 +374,7 @@ int ext4_ext_migrate(struct inode *inode)
struct ext4_inode_info *ei;
struct inode *tmp_inode = NULL;
struct migrate_struct lb;
- unsigned long max_entries;
+ ext4_lblk_t max_entries, inc, mult;
__u32 goal;
uid_t owner[2];
@@ -523,34 +464,29 @@ int ext4_ext_migrate(struct inode *inode)
/* 32 bit block address 4 bytes */
max_entries = inode->i_sb->s_blocksize >> 2;
- for (i = 0; i < EXT4_NDIR_BLOCKS; i++) {
+
+ inc = 1; mult = 1;
+ for (i = 0; i < EXT4_N_BLOCKS; i++) {
+ inc *= mult;
+ if (i == EXT4_IND_BLOCK)
+ mult = max_entries;
+
if (i_data[i]) {
- retval = update_extent_range(handle, tmp_inode,
+ if (i < EXT4_IND_BLOCK)
+ retval = update_extent_range(handle, tmp_inode,
le32_to_cpu(i_data[i]), &lb);
+ else
+ retval = update_ind_extent_range(handle,
+ tmp_inode,
+ le32_to_cpu(i_data[i]),
+ &lb, inc);
if (retval)
goto err_out;
- } else
- lb.curr_block++;
- }
- if (i_data[EXT4_IND_BLOCK]) {
- retval = update_ind_extent_range(handle, tmp_inode,
- le32_to_cpu(i_data[EXT4_IND_BLOCK]), &lb);
- if (retval)
- goto err_out;
- } else
- lb.curr_block += max_entries;
- if (i_data[EXT4_DIND_BLOCK]) {
- retval = update_dind_extent_range(handle, tmp_inode,
- le32_to_cpu(i_data[EXT4_DIND_BLOCK]), &lb);
- if (retval)
- goto err_out;
- } else
- lb.curr_block += max_entries * max_entries;
- if (i_data[EXT4_TIND_BLOCK]) {
- retval = update_tind_extent_range(handle, tmp_inode,
- le32_to_cpu(i_data[EXT4_TIND_BLOCK]), &lb);
- if (retval)
- goto err_out;
+
+ } else {
+ if (i < EXT4_TIND_BLOCK)
+ lb.curr_block += inc * mult;
+ }
}
/*
* Build the last extent
--
2.17.1
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