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Message-ID: <4745B4F2.3060308@openvz.org>
Date: Thu, 22 Nov 2007 19:57:22 +0300
From: Pavel Emelyanov <xemul@...nvz.org>
To: Andrew Morton <akpm@...l.org>
CC: Linux MM <linux-mm@...ck.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
devel@...nvz.org
Subject: [PATCH][SHMEM] Factor out sbi->free_inodes manipulations
The shmem_sb_info structure has a number of free_inodes. This
value is altered in appropriate places under spinlock and with
the sbi->max_inodes != 0 check.
Consolidate these manipulations into two helpers.
This is minus 30 bytes of shmem.o and minus 4 :) lines of code.
Signed-off-by: Pavel Emelyanov <xemul@...nvz.org>
---
diff --git a/mm/shmem.c b/mm/shmem.c
index e0d4b2e..abba17c 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -205,6 +205,29 @@ static void shmem_free_blocks(struct inode *inode, long pages)
}
}
+static int shmem_inc_inodes(struct shmem_sb_info *sbinfo)
+{
+ if (sbinfo->max_inodes) {
+ spin_lock(&sbinfo->stat_lock);
+ if (!sbinfo->free_inodes) {
+ spin_unlock(&sbinfo->stat_lock);
+ return -ENOMEM;
+ }
+ sbinfo->free_inodes--;
+ spin_unlock(&sbinfo->stat_lock);
+ }
+ return 0;
+}
+
+static void shmem_dec_inodes(struct shmem_sb_info *sbinfo)
+{
+ if (sbinfo->max_inodes) {
+ spin_lock(&sbinfo->stat_lock);
+ sbinfo->free_inodes++;
+ spin_unlock(&sbinfo->stat_lock);
+ }
+}
+
/*
* shmem_recalc_inode - recalculate the size of an inode
*
@@ -777,11 +800,7 @@ static void shmem_delete_inode(struct inode *inode)
}
}
BUG_ON(inode->i_blocks);
- if (sbinfo->max_inodes) {
- spin_lock(&sbinfo->stat_lock);
- sbinfo->free_inodes++;
- spin_unlock(&sbinfo->stat_lock);
- }
+ shmem_dec_inodes(sbinfo);
clear_inode(inode);
}
@@ -1370,15 +1389,8 @@ shmem_get_inode(struct super_block *sb, int mode, dev_t dev)
struct shmem_inode_info *info;
struct shmem_sb_info *sbinfo = SHMEM_SB(sb);
- if (sbinfo->max_inodes) {
- spin_lock(&sbinfo->stat_lock);
- if (!sbinfo->free_inodes) {
- spin_unlock(&sbinfo->stat_lock);
- return NULL;
- }
- sbinfo->free_inodes--;
- spin_unlock(&sbinfo->stat_lock);
- }
+ if (shmem_inc_inodes(sbinfo))
+ return NULL;
inode = new_inode(sb);
if (inode) {
@@ -1422,11 +1434,8 @@ shmem_get_inode(struct super_block *sb, int mode, dev_t dev)
NULL);
break;
}
- } else if (sbinfo->max_inodes) {
- spin_lock(&sbinfo->stat_lock);
- sbinfo->free_inodes++;
- spin_unlock(&sbinfo->stat_lock);
- }
+ } else
+ shmem_dec_inodes(sbinfo);
return inode;
}
@@ -1676,15 +1685,8 @@ static int shmem_link(struct dentry *old_dentry, struct inode *dir, struct dentr
* but each new link needs a new dentry, pinning lowmem, and
* tmpfs dentries cannot be pruned until they are unlinked.
*/
- if (sbinfo->max_inodes) {
- spin_lock(&sbinfo->stat_lock);
- if (!sbinfo->free_inodes) {
- spin_unlock(&sbinfo->stat_lock);
- return -ENOSPC;
- }
- sbinfo->free_inodes--;
- spin_unlock(&sbinfo->stat_lock);
- }
+ if (shmem_inc_inodes(sbinfo))
+ return -ENOSPC;
dir->i_size += BOGO_DIRENT_SIZE;
inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
@@ -1699,14 +1701,8 @@ static int shmem_unlink(struct inode *dir, struct dentry *dentry)
{
struct inode *inode = dentry->d_inode;
- if (inode->i_nlink > 1 && !S_ISDIR(inode->i_mode)) {
- struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb);
- if (sbinfo->max_inodes) {
- spin_lock(&sbinfo->stat_lock);
- sbinfo->free_inodes++;
- spin_unlock(&sbinfo->stat_lock);
- }
- }
+ if (inode->i_nlink > 1 && !S_ISDIR(inode->i_mode))
+ shmem_dec_inodes(SHMEM_SB(inode->i_sb));
dir->i_size -= BOGO_DIRENT_SIZE;
inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
-
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