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| author | Al Viro <viro@zeniv.linux.org.uk> | 2010-03-23 06:06:58 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2010-05-21 18:31:16 -0400 |
| commit | 01a05b337a5b647909e1d6670f57e7202318a5fb (patch) | |
| tree | 7877f08db14877d06346c8e1ef52aa17f2483e93 /fs/drop_caches.c | |
| parent | 35cf7ba0b46dc3582a01c3860b14bff122662aa3 (diff) | |
| download | linux-3.10-01a05b337a5b647909e1d6670f57e7202318a5fb.tar.gz linux-3.10-01a05b337a5b647909e1d6670f57e7202318a5fb.tar.bz2 linux-3.10-01a05b337a5b647909e1d6670f57e7202318a5fb.zip | |
new helper: iterate_supers()
... and switch the simple "loop over superblocks and do something"
loops to it.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/drop_caches.c')
| -rw-r--r-- | fs/drop_caches.c | 25 |
1 files changed, 2 insertions, 23 deletions
diff --git a/fs/drop_caches.c b/fs/drop_caches.c index 52047cf4177..83c4f600786 100644 --- a/fs/drop_caches.c +++ b/fs/drop_caches.c @@ -8,12 +8,11 @@ #include <linux/writeback.h> #include <linux/sysctl.h> #include <linux/gfp.h> -#include "internal.h" /* A global variable is a bit ugly, but it keeps the code simple */ int sysctl_drop_caches; -static void drop_pagecache_sb(struct super_block *sb) +static void drop_pagecache_sb(struct super_block *sb, void *unused) { struct inode *inode, *toput_inode = NULL; @@ -34,26 +33,6 @@ static void drop_pagecache_sb(struct super_block *sb) iput(toput_inode); } -static void drop_pagecache(void) -{ - struct super_block *sb, *n; - - spin_lock(&sb_lock); - list_for_each_entry_safe(sb, n, &super_blocks, s_list) { - if (list_empty(&sb->s_instances)) - continue; - sb->s_count++; - spin_unlock(&sb_lock); - down_read(&sb->s_umount); - if (sb->s_root) - drop_pagecache_sb(sb); - up_read(&sb->s_umount); - spin_lock(&sb_lock); - __put_super(sb); - } - spin_unlock(&sb_lock); -} - static void drop_slab(void) { int nr_objects; @@ -69,7 +48,7 @@ int drop_caches_sysctl_handler(ctl_table *table, int write, proc_dointvec_minmax(table, write, buffer, length, ppos); if (write) { if (sysctl_drop_caches & 1) - drop_pagecache(); + iterate_supers(drop_pagecache_sb, NULL); if (sysctl_drop_caches & 2) drop_slab(); } |