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authorVyacheslav Dubeyko <slava@dubeyko.com>2013-07-03 15:08:05 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-07-03 16:08:01 -0700
commitc7ef972c440fc9f1eda28b450cd30ad15c4d60cf (patch)
tree5f415ed5b082632848cae6e5798a8ac986e0ed38 /fs/nilfs2/ifile.c
parente88b815e011bcacb7066f1156ce390f6b0adc9df (diff)
nilfs2: implement calculation of free inodes count
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>
Diffstat (limited to 'fs/nilfs2/ifile.c')
-rw-r--r--fs/nilfs2/ifile.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/fs/nilfs2/ifile.c b/fs/nilfs2/ifile.c
index d8e65bde083c..d788a5928351 100644
--- a/fs/nilfs2/ifile.c
+++ b/fs/nilfs2/ifile.c
@@ -160,6 +160,28 @@ int nilfs_ifile_get_inode_block(struct inode *ifile, ino_t ino,
}
/**
+ * 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
* @root: root object