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ceph: use atomic_t for ceph_inode_info::i_shared_gen

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It allows accessing i_shared_gen without holding i_ceph_lock. It is
preparation for later patch.

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Acked-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Yan, Zheng
2017-11-27 10:47:46 +08:00
committed by Ilya Dryomov
parent 8d8f371c83
commit 97aeb6bf98
4 changed files with 13 additions and 12 deletions
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14
fs/ceph/dir.c
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@@ -173,7 +173,7 @@ __dcache_find_get_entry(struct dentry *parent, u64 idx,
* the MDS if/when the directory is modified).
*/
static int __dcache_readdir(struct file *file, struct dir_context *ctx,
u32 shared_gen)
int shared_gen)
{
struct ceph_file_info *fi = file->private_data;
struct dentry *parent = file->f_path.dentry;
@@ -184,7 +184,7 @@ static int __dcache_readdir(struct file *file, struct dir_context *ctx,
u64 idx = 0;
int err = 0;
dout("__dcache_readdir %p v%u at %llx\n", dir, shared_gen, ctx->pos);
dout("__dcache_readdir %p v%u at %llx\n", dir, (unsigned)shared_gen, ctx->pos);
/* search start position */
if (ctx->pos > 2) {
@@ -333,7 +333,7 @@ static int ceph_readdir(struct file *file, struct dir_context *ctx)
ceph_snap(inode) != CEPH_SNAPDIR &&
__ceph_dir_is_complete_ordered(ci) &&
__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) {
u32 shared_gen = ci->i_shared_gen;
int shared_gen = atomic_read(&ci->i_shared_gen);
spin_unlock(&ci->i_ceph_lock);
err = __dcache_readdir(file, ctx, shared_gen);
if (err != -EAGAIN)
@@ -751,7 +751,7 @@ static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry,
spin_unlock(&ci->i_ceph_lock);
dout(" dir %p complete, -ENOENT\n", dir);
d_add(dentry, NULL);
di->lease_shared_gen = ci->i_shared_gen;
di->lease_shared_gen = atomic_read(&ci->i_shared_gen);
return NULL;
}
spin_unlock(&ci->i_ceph_lock);
@@ -1191,12 +1191,12 @@ static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry)
int valid = 0;
spin_lock(&ci->i_ceph_lock);
if (ci->i_shared_gen == di->lease_shared_gen)
if (atomic_read(&ci->i_shared_gen) == di->lease_shared_gen)
valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1);
spin_unlock(&ci->i_ceph_lock);
dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n",
dir, (unsigned)ci->i_shared_gen, dentry,
(unsigned)di->lease_shared_gen, valid);
dir, (unsigned)atomic_read(&ci->i_shared_gen),
dentry, (unsigned)di->lease_shared_gen, valid);
return valid;
}