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scoutfs: add inode_paths ioctl

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This adds the ioctl that returns all the paths from the root to a given
inode.  The implementation only traverses btree items to keep it
isolated from the vfs object locking and life cycles, but that could be
a performance problem.  This is another motivation to accelerate the
btree code.

Signed-off-by: Zach Brown <zab@versity.com>
This commit is contained in:
Zach Brown
2016-08-11 16:46:18 -07:00
parent 77e0ffb981
commit 0991622a21
7 changed files with 417 additions and 10 deletions
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kmod/src/inode.c
+3
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@@ -118,6 +118,7 @@ static void load_inode(struct inode *inode, struct scoutfs_inode *cinode)
inode->i_ctime.tv_nsec = le32_to_cpu(cinode->ctime.nsec);
ci->salt = le32_to_cpu(cinode->salt);
atomic64_set(&ci->link_counter, le64_to_cpu(cinode->link_counter));
}
static int scoutfs_read_locked_inode(struct inode *inode)
@@ -199,6 +200,7 @@ static void store_inode(struct scoutfs_inode *cinode, struct inode *inode)
cinode->mtime.nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
cinode->salt = cpu_to_le32(ci->salt);
cinode->link_counter = cpu_to_le64(atomic64_read(&ci->link_counter));
}
/*
@@ -307,6 +309,7 @@ struct inode *scoutfs_new_inode(struct super_block *sb, struct inode *dir,
ci = SCOUTFS_I(inode);
ci->ino = ino;
get_random_bytes(&ci->salt, sizeof(ci->salt));
atomic64_set(&ci->link_counter, 0);
inode->i_ino = ino; /* XXX overflow */
inode_init_owner(inode, dir, mode);