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gfs2: Use gfs2 wrapper to sync inode before calling generic_file_splice_read() 

gfs2_file_splice_read() f_op grabs and releases the cluster-wide
inode glock to sync the inode size to the latest.

Without this, generic_file_splice_read() uses an older i_size value
and can return EOF for valid offsets in the inode.

Signed-off-by: Abhi Das <adas@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
This commit is contained in:
Abhi Das 2016-04-05 12:06:15 -04:00 committed by Bob Peterson
parent 73cc86252b
commit 611526756a
1 changed files with 26 additions and 2 deletions
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28
fs/gfs2/file.c
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@ -950,6 +950,30 @@ static long gfs2_fallocate(struct file *file, int mode, loff_t offset, loff_t le
return ret;
}
static ssize_t gfs2_file_splice_read(struct file *in, loff_t *ppos,
struct pipe_inode_info *pipe, size_t len,
unsigned int flags)
{
struct inode *inode = in->f_mapping->host;
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_holder gh;
int ret;
mutex_lock(&inode->i_mutex);
ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
if (ret) {
mutex_unlock(&inode->i_mutex);
return ret;
}
gfs2_glock_dq_uninit(&gh);
mutex_unlock(&inode->i_mutex);
return generic_file_splice_read(in, ppos, pipe, len, flags);
}
static ssize_t gfs2_file_splice_write(struct pipe_inode_info *pipe,
struct file *out, loff_t *ppos,
size_t len, unsigned int flags)
@ -1112,7 +1136,7 @@ const struct file_operations gfs2_file_fops = {
.fsync = gfs2_fsync,
.lock = gfs2_lock,
.flock = gfs2_flock,
.splice_read = generic_file_splice_read,
.splice_read = gfs2_file_splice_read,
.splice_write = gfs2_file_splice_write,
.setlease = simple_nosetlease,
.fallocate = gfs2_fallocate,
@ -1140,7 +1164,7 @@ const struct file_operations gfs2_file_fops_nolock = {
.open = gfs2_open,
.release = gfs2_release,
.fsync = gfs2_fsync,
.splice_read = generic_file_splice_read,
.splice_read = gfs2_file_splice_read,
.splice_write = gfs2_file_splice_write,
.setlease = generic_setlease,
.fallocate = gfs2_fallocate,