On Tue, 16 Jul 2013, Li Wang wrote:
> This patch implements fallocate and hole punch support for Ceph fuse client.
>
> Signed-off-by: Yunchuan Wen <[email protected]>
> Signed-off-by: Li Wang <[email protected]>
> ---
>
> Passed the fsx test.
Yay! Is it the version that qa/workunits/suites/fsx.sh runs? Does that
script need to be modified to exercise the hole punching or does it detect
when it is present on its own?
A few comments below... I think this can be simplified a bit more.
Thanks!
sage
> ---
> src/client/Client.cc | 114
> ++++++++++++++++++++++++++++++++++++++++
> src/client/Client.h | 5 ++
> src/client/fuse_ll.cc | 26 +++++++++
> src/include/cephfs/libcephfs.h | 13 +++++
> src/libcephfs.cc | 8 +++
> 5 files changed, 166 insertions(+)
>
> diff --git a/src/client/Client.cc b/src/client/Client.cc
> index ae7ddf6..77fe6a2 100644
> --- a/src/client/Client.cc
> +++ b/src/client/Client.cc
> @@ -22,6 +22,7 @@
> #include <sys/stat.h>
> #include <sys/param.h>
> #include <fcntl.h>
> +#include <linux/falloc.h>
>
> #include <sys/statvfs.h>
>
> @@ -7664,6 +7665,119 @@ int Client::ll_fsync(Fh *fh, bool syncdataonly)
> return _fsync(fh, syncdataonly);
> }
>
> +int Client::_punch_hole(Fh *fh, int64_t offset, int64_t length)
We should pass the flag for whether to extend the file into this
function...
> +{
> + if (osdmap->test_flag(CEPH_OSDMAP_FULL))
> + return -ENOSPC;
> +
> + Inode *in = fh->inode;
> +
> + assert(in->snapid == CEPH_NOSNAP);
> +
> + if ((fh->mode & CEPH_FILE_MODE_WR) == 0)
> + return -EBADF;
> +
> + int have;
> + int r = get_caps(in, CEPH_CAP_FILE_WR, CEPH_CAP_FILE_BUFFER, &have, -1);
> + if (r < 0)
> + return r;
> +
> + Mutex flock("Client::_punch_hole flock");
> + Cond cond;
> + bool done = false;
> + Context *onfinish = new C_SafeCond(&flock, &cond, &done);
> + Context *onsafe = new C_Client_SyncCommit(this, in);
> +
> + unsafe_sync_write++;
> + get_cap_ref(in, CEPH_CAP_FILE_BUFFER);
> +
> + _invalidate_inode_cache(in, offset, length, true);
> + r = filer->zero(in->ino, &in->layout,
> + in->snaprealm->get_snap_context(),
> + offset, length,
> + ceph_clock_now(cct),
> + 0, onfinish, onsafe);
> + if (r < 0)
> + goto done;
> +
> + client_lock.Unlock();
> + flock.Lock();
> + while (!done)
> + cond.Wait(flock);
> + flock.Unlock();
> + client_lock.Lock();
> +
...and do the file size extension here, while we still old the FILE_WR
cap ref.
> + in->mtime = ceph_clock_now(cct);
> + mark_caps_dirty(in, CEPH_CAP_FILE_WR);
> +
> +done:
> + put_cap_ref(in, CEPH_CAP_FILE_WR);
> + return r;
> +}
> +
> +int Client::_extend_size(Fh *fh, uint64_t length)
> +{
> + Inode *in = fh->inode;
> +
> + assert(in->snapid == CEPH_NOSNAP);
> +
> + if ((fh->mode & CEPH_FILE_MODE_WR) == 0)
> + return -EBADF;
> +
> + int have;
> + int r = get_caps(in, CEPH_CAP_FILE_WR, 0, &have, length);
> + if (r < 0)
> + return r;
> +
> + if (length > in->size) {
> + in->mtime = ceph_clock_now(cct);
> + in->size = length;
> + mark_caps_dirty(in, CEPH_CAP_FILE_WR);
> +
> + if ((in->size << 1) >= in->max_size &&
> + (in->reported_size << 1) < in->max_size)
> + check_caps(in, false);
> + }
> +
> + put_cap_ref(in, CEPH_CAP_FILE_WR);
> +
> + return 0;
> +}
Then we can drop this whole function, and don't have to think about
situations where, say, we get caps and do the punch, but fail to get caps
a second time change the file size.
> +
> +int Client::_fallocate(Fh *fh, int mode, int64_t offset, int64_t length)
> +{
> + if (offset < 0 || length < 0)
> + return -EINVAL;
> +
> + if (mode & FALLOC_FL_PUNCH_HOLE)
> + return _punch_hole(fh, offset, length);
> +
> + if (!(mode & FALLOC_FL_KEEP_SIZE))
> + return _extend_size(fh, offset + length);
this would go away too.
> +
> + return 0;
> +}
> +
> +int Client::ll_fallocate(Fh *fh, int mode, loff_t offset, loff_t length)
> +{
> + Mutex::Locker lock(client_lock);
> + ldout(cct, 3) << "ll_fallocate " << fh << " " << fh->inode->ino << " " <<
> dendl;
> + tout(cct) << "ll_fallocate " << mode << " " << offset << " " << length <<
> std::endl;
> + tout(cct) << (unsigned long)fh << std::endl;
> +
> + return _fallocate(fh, mode, offset, length);
> +}
> +
> +int Client::fallocate(int fd, int mode, loff_t offset, loff_t length)
> +{
> + Mutex::Locker lock(client_lock);
> + tout(cct) << "fallocate " << " " << fd << mode << " " << offset << " " <<
> length << std::endl;
> +
> + Fh *fh = get_filehandle(fd);
> + if (!fh)
> + return -EBADF;
> + return _fallocate(fh, mode, offset, length);
> +}
>
> int Client::ll_release(Fh *fh)
> {
> diff --git a/src/client/Client.h b/src/client/Client.h
> index 96e8937..e5dd310 100644
> --- a/src/client/Client.h
> +++ b/src/client/Client.h
> @@ -555,6 +555,9 @@ private:
> int _flush(Fh *fh);
> int _fsync(Fh *fh, bool syncdataonly);
> int _sync_fs();
> + int _extend_size(Fh *fh, uint64_t length);
> + int _punch_hole(Fh *fh, int64_t offset, int64_t length);
> + int _fallocate(Fh *fh, int mode, int64_t offset, int64_t length);
>
> int get_or_create(Inode *dir, const char* name,
> Dentry **pdn, bool expect_null=false);
> @@ -653,6 +656,7 @@ public:
> int ftruncate(int fd, loff_t size);
> int fsync(int fd, bool syncdataonly);
> int fstat(int fd, struct stat *stbuf);
> + int fallocate(int fd, int mode, loff_t offset, loff_t length);
>
> // full path xattr ops
> int getxattr(const char *path, const char *name, void *value, size_t size);
> @@ -722,6 +726,7 @@ public:
> int ll_write(Fh *fh, loff_t off, loff_t len, const char *data);
> int ll_flush(Fh *fh);
> int ll_fsync(Fh *fh, bool syncdataonly);
> + int ll_fallocate(Fh *fh, int mode, loff_t offset, loff_t length);
> int ll_release(Fh *fh);
> int ll_statfs(vinodeno_t vino, struct statvfs *stbuf);
>
> diff --git a/src/client/fuse_ll.cc b/src/client/fuse_ll.cc
> index 8339553..836b5b2 100644
> --- a/src/client/fuse_ll.cc
> +++ b/src/client/fuse_ll.cc
> @@ -399,6 +399,20 @@ static void fuse_ll_ioctl(fuse_req_t req, fuse_ino_t
> ino, int cmd, void *arg, st
> }
> #endif
>
> +#if FUSE_VERSION >= FUSE_MAKE_VERSION(2, 9)
> +
> +static void fuse_ll_fallocate(fuse_req_t req, fuse_ino_t ino, int mode,
> + off_t offset, off_t length,
> + struct fuse_file_info *fi)
> +{
> + CephFuse::Handle *cfuse = (CephFuse::Handle *)fuse_req_userdata(req);
> + Fh *fh = (Fh*)fi->fh;
> + int r = cfuse->client->ll_fallocate(fh, mode, offset, length);
> + fuse_reply_err(req, -r);
> +}
> +
> +#endif
> +
> static void fuse_ll_release(fuse_req_t req, fuse_ino_t ino, struct
> fuse_file_info *fi)
> {
> CephFuse::Handle *cfuse = (CephFuse::Handle *)fuse_req_userdata(req);
> @@ -599,8 +613,20 @@ const static struct fuse_lowlevel_ops fuse_ll_oper = {
> getlk: 0,
> setlk: 0,
> bmap: 0,
> +#if FUSE_VERSION >= FUSE_MAKE_VERSION(2, 8)
> #ifdef FUSE_IOCTL_COMPAT
> ioctl: fuse_ll_ioctl,
> +#else
> + ioctl: 0,
> +#endif
> + poll: 0,
> +#if FUSE_VERSION >= FUSE_MAKE_VERSION(2, 9)
> + write_buf: 0,
> + retrieve_reply: 0,
> + forget_multi: 0,
> + flock: 0,
> + fallocate: fuse_ll_fallocate
> +#endif
> #endif
> };
>
> diff --git a/src/include/cephfs/libcephfs.h b/src/include/cephfs/libcephfs.h
> index 93e86e7..25a4861 100644
> --- a/src/include/cephfs/libcephfs.h
> +++ b/src/include/cephfs/libcephfs.h
> @@ -709,6 +709,19 @@ int ceph_ftruncate(struct ceph_mount_info *cmount, int
> fd, loff_t size);
> int ceph_fsync(struct ceph_mount_info *cmount, int fd, int syncdataonly);
>
> /**
> + * Prefallocate or delete blocks in an open file.
> + *
> + * @param cmount the ceph mount handle to use for performing the fallocate.
> + * @param fd the file descriptor of the file to sync.
> + * @param mode a flags determines the operation to be performed on the given
> range.
> + * @param offset the offset of the file which the range begin.
> + * @param length the length of the range.
> + * @return 0 on success or a negative error code on failure.
If these args match the posix call (the flags, for instance), let's
reference that in the comment.
> + */
> +int ceph_fallocate(struct ceph_mount_info *cmount, int fd, int mode,
> + loff_t offset, loff_t length);
> +
> +/**
> * Get the open file's statistics.
> *
> * @param cmount the ceph mount handle to use for performing the fstat.
> diff --git a/src/libcephfs.cc b/src/libcephfs.cc
> index 16b130a..306c4ba 100644
> --- a/src/libcephfs.cc
> +++ b/src/libcephfs.cc
> @@ -700,6 +700,14 @@ extern "C" int ceph_fsync(struct ceph_mount_info
> *cmount, int fd, int syncdataon
> return cmount->get_client()->fsync(fd, syncdataonly);
> }
>
> +extern "C" int ceph_fallocate(struct ceph_mount_info *cmount, int fd, int
> mode,
> + loff_t offset, loff_t length)
> +{
> + if (!cmount->is_mounted())
> + return -ENOTCONN;
> + return cmount->get_client()->fallocate(fd, mode, offset, length);
> +}
> +
> extern "C" int ceph_fstat(struct ceph_mount_info *cmount, int fd, struct
> stat *stbuf)
> {
> if (!cmount->is_mounted())
> --
> 1.7.9.5
>
>
>
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