xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

nilfs2: implement calculation of free inodes count

Browse Source 
Currently, NILFS2 returns 0 as free inodes count (f_ffree) and current
used inodes count as total file nodes in file system (f_files):

df -i
Filesystem      Inodes  IUsed   IFree IUse% Mounted on
/dev/loop0           2      2       0  100% /mnt/nilfs2

This patch implements real calculation of free inodes count.  First of
all, it is calculated total file nodes in file system as
(desc_blocks_count * groups_per_desc_block * entries_per_group).  Then, it
is calculated free inodes count as difference the total file nodes and
used inodes count.  As a result, we have such output for NILFS2:

df -i
Filesystem       Inodes   IUsed    IFree IUse% Mounted on
/dev/loop0      4194304 2114701  2079603   51% /mnt/nilfs2

Reported-by: Clemens Eisserer <linuxhippy@gmail.com>
Signed-off-by: Vyacheslav Dubeyko <slava@dubeyko.com>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Tested-by: Vyacheslav Dubeyko <slava@dubeyko.com>
Cc: Joern Engel <joern@logfs.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Vyacheslav Dubeyko
2013-07-03 15:08:05 -07:00
committed by Linus Torvalds
parent e88b815e01
commit c7ef972c44
5 changed files with 112 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
fs/nilfs2/ifile.c
View File

@@ -159,6 +159,28 @@ int nilfs_ifile_get_inode_block(struct inode *ifile, ino_t ino,
return err;
}
/**
* nilfs_ifile_count_free_inodes - calculate free inodes count
* @ifile: ifile inode
* @nmaxinodes: current maximum of available inodes count [out]
* @nfreeinodes: free inodes count [out]
*/
int nilfs_ifile_count_free_inodes(struct inode *ifile,
u64 *nmaxinodes, u64 *nfreeinodes)
{
u64 nused;
int err;
*nmaxinodes = 0;
*nfreeinodes = 0;
nused = atomic_read(&NILFS_I(ifile)->i_root->inodes_count);
err = nilfs_palloc_count_max_entries(ifile, nused, nmaxinodes);
if (likely(!err))
*nfreeinodes = *nmaxinodes - nused;
return err;
}
/**
* nilfs_ifile_read - read or get ifile inode
* @sb: super block instance