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Fri, 16 Jun 2017 14:51:39 +0000 (UTC) From: Andreas Gruenbacher To: linux-fsdevel@vger.kernel.org Cc: Andreas Gruenbacher , Bob Peterson , linux-xfs@vger.kernel.org, cluster-devel@redhat.com Subject: [PATCH 5/7] gfs2: Implement lseek SEEK_HOLE / SEEK_DATA via iomap Date: Fri, 16 Jun 2017 16:51:18 +0200 Message-Id: <1497624680-16685-6-git-send-email-agruenba@redhat.com> In-Reply-To: <1497624680-16685-1-git-send-email-agruenba@redhat.com> References: <1497624680-16685-1-git-send-email-agruenba@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.31]); Fri, 16 Jun 2017 14:51:41 +0000 (UTC) Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Signed-off-by: Andreas Gruenbacher --- fs/gfs2/file.c | 14 +++++++++++--- fs/gfs2/inode.c | 32 ++++++++++++++++++++++++++++++++ fs/gfs2/inode.h | 1 + 3 files changed, 44 insertions(+), 3 deletions(-) diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c index c2062a1..62ce320 100644 --- a/fs/gfs2/file.c +++ b/fs/gfs2/file.c @@ -60,9 +60,7 @@ static loff_t gfs2_llseek(struct file *file, loff_t offset, int whence) loff_t error; switch (whence) { - case SEEK_END: /* These reference inode->i_size */ - case SEEK_DATA: - case SEEK_HOLE: + case SEEK_END: error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); if (!error) { @@ -70,8 +68,18 @@ static loff_t gfs2_llseek(struct file *file, loff_t offset, int whence) gfs2_glock_dq_uninit(&i_gh); } break; + + case SEEK_DATA: + case SEEK_HOLE: + error = gfs2_seek_hole_data(file, offset, whence); + break; + case SEEK_CUR: case SEEK_SET: + /* + * These don't reference inode->i_size and don't depend on the + * block mapping, so we don't need the glock. + */ error = generic_file_llseek(file, offset, whence); break; default: diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c index 9ed2e91..c8885e5 100644 --- a/fs/gfs2/inode.c +++ b/fs/gfs2/inode.c @@ -2046,6 +2046,38 @@ static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, return ret; } +loff_t gfs2_seek_hole_data(struct file *file, loff_t offset, int whence) +{ + struct inode *inode = file->f_mapping->host; + struct gfs2_inode *ip = GFS2_I(inode); + struct gfs2_holder gh; + loff_t ret; + + inode_lock(inode); + ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); + if (ret) + goto out; + if (gfs2_is_stuffed(ip)) { + u64 size = i_size_read(inode); + + if (offset >= size) { + ret = -ENXIO; + goto out_dequeue; + } + ret = offset; + if (whence == SEEK_HOLE) + ret = size; + } else { + ret = iomap_seek_hole_data(file, offset, whence, &gfs2_iomap_ops); + } + +out_dequeue: + gfs2_glock_dq_uninit(&gh); +out: + inode_unlock(inode); + return ret; +} + const struct inode_operations gfs2_file_iops = { .permission = gfs2_permission, .setattr = gfs2_setattr, diff --git a/fs/gfs2/inode.h b/fs/gfs2/inode.h index aace8ce..c2866ec 100644 --- a/fs/gfs2/inode.h +++ b/fs/gfs2/inode.h @@ -109,6 +109,7 @@ extern int gfs2_setattr_simple(struct inode *inode, struct iattr *attr); extern struct inode *gfs2_lookup_simple(struct inode *dip, const char *name); extern void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf); extern int gfs2_open_common(struct inode *inode, struct file *file); +extern loff_t gfs2_seek_hole_data(struct file *file, loff_t offset, int whence); extern const struct inode_operations gfs2_file_iops; extern const struct inode_operations gfs2_dir_iops;