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| author | Mark Fasheh <mfasheh@suse.com> | 2008-07-21 14:29:16 -0700 |
|---|---|---|
| committer | Mark Fasheh <mfasheh@suse.com> | 2008-10-13 13:57:57 -0700 |
| commit | 53da4939f349d4edd283b043219221ca5b78e4d4 (patch) | |
| tree | 3e0f8e1bd5474822431cffd1e449df9b639e1772 /fs/ocfs2/inode.c | |
| parent | a447c0932445f92ce6f4c1bd020f62c5097a7842 (diff) | |
| download | lwn-53da4939f349d4edd283b043219221ca5b78e4d4.tar.gz lwn-53da4939f349d4edd283b043219221ca5b78e4d4.zip | |
ocfs2: POSIX file locks support
This is actually pretty easy since fs/dlm already handles the bulk of the
work. The Ocfs2 userspace cluster stack module already uses fs/dlm as the
underlying lock manager, so I only had to add the right calls.
Cluster-aware POSIX locks ("plocks") can be turned off by the same means at
UNIX locks - mount with 'noflocks', or create a local-only Ocfs2 volume.
Internally, the file system uses two sets of file_operations, depending on
whether cluster aware plocks is required. This turns out to be easier than
implementing local-only versions of ->lock.
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
Diffstat (limited to 'fs/ocfs2/inode.c')
| -rw-r--r-- | fs/ocfs2/inode.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/fs/ocfs2/inode.c b/fs/ocfs2/inode.c index 7e9e4c79aec7..99f012a0f207 100644 --- a/fs/ocfs2/inode.c +++ b/fs/ocfs2/inode.c @@ -219,6 +219,7 @@ int ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe, struct super_block *sb; struct ocfs2_super *osb; int status = -EINVAL; + int use_plocks = 1; mlog_entry("(0x%p, size:%llu)\n", inode, (unsigned long long)le64_to_cpu(fe->i_size)); @@ -226,6 +227,10 @@ int ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe, sb = inode->i_sb; osb = OCFS2_SB(sb); + if ((osb->s_mount_opt & OCFS2_MOUNT_LOCALFLOCKS) || + ocfs2_mount_local(osb) || !ocfs2_stack_supports_plocks()) + use_plocks = 0; + /* this means that read_inode cannot create a superblock inode * today. change if needed. */ if (!OCFS2_IS_VALID_DINODE(fe) || @@ -295,13 +300,19 @@ int ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe, switch (inode->i_mode & S_IFMT) { case S_IFREG: - inode->i_fop = &ocfs2_fops; + if (use_plocks) + inode->i_fop = &ocfs2_fops; + else + inode->i_fop = &ocfs2_fops_no_plocks; inode->i_op = &ocfs2_file_iops; i_size_write(inode, le64_to_cpu(fe->i_size)); break; case S_IFDIR: inode->i_op = &ocfs2_dir_iops; - inode->i_fop = &ocfs2_dops; + if (use_plocks) + inode->i_fop = &ocfs2_dops; + else + inode->i_fop = &ocfs2_dops_no_plocks; i_size_write(inode, le64_to_cpu(fe->i_size)); break; case S_IFLNK: |