| Message ID | 20230511030335.337094-2-xiubli@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | ceph: fix blindly expanding the readahead windows | expand |
On Thu, May 11, 2023 at 11:03:34AM +0800, xiubli@redhat.com wrote: > From: Xiubo Li <xiubli@redhat.com> > > We need to save the 'f_ra.ra_pages' to expand the readahead window > later. > > Cc: stable@vger.kernel.org > Fixes: 49870056005c ("ceph: convert ceph_readpages to ceph_readahead") > URL: https://lore.kernel.org/ceph-devel/20230504082510.247-1-sehuww@mail.scut.edu.cn > URL: https://www.spinics.net/lists/ceph-users/msg76183.html > Cc: Hu Weiwen <sehuww@mail.scut.edu.cn> > Signed-off-by: Xiubo Li <xiubli@redhat.com> > --- > fs/ceph/addr.c | 43 ++++++++++++++++++++++++++++++++----------- > fs/ceph/super.h | 13 +++++++++++++ > 2 files changed, 45 insertions(+), 11 deletions(-) > > diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c > index 3b20873733af..db55fce13324 100644 > --- a/fs/ceph/addr.c > +++ b/fs/ceph/addr.c > @@ -404,18 +404,27 @@ static int ceph_init_request(struct netfs_io_request *rreq, struct file *file) > { > struct inode *inode = rreq->inode; > int got = 0, want = CEPH_CAP_FILE_CACHE; > + struct ceph_netfs_request_data *priv; > int ret = 0; > > if (rreq->origin != NETFS_READAHEAD) > return 0; > > + priv = kzalloc(sizeof(*priv), GFP_NOFS); > + if (!priv) > + return -ENOMEM; > + > if (file) { > struct ceph_rw_context *rw_ctx; > struct ceph_file_info *fi = file->private_data; > > rw_ctx = ceph_find_rw_context(fi); > - if (rw_ctx) > + if (rw_ctx) { > + kfree(priv); > return 0; This is not working. When reaching here by read() system call, we always have non-null rw_ctx. (As I read the code and also verified with gdb) ceph_add_rw_context() is invoked in ceph_read_iter(). > + } > + priv->file_ra_pages = file->f_ra.ra_pages; > + priv->file_ra_disabled = !!(file->f_mode & FMODE_RANDOM); '!!' is not needed. From coding-style.rst: "When using bool types the !! construction is not needed, which eliminates a class of bugs". Thanks Hu Weiwen > } > > /* > @@ -425,27 +434,39 @@ static int ceph_init_request(struct netfs_io_request *rreq, struct file *file) > ret = ceph_try_get_caps(inode, CEPH_CAP_FILE_RD, want, true, &got); > if (ret < 0) { > dout("start_read %p, error getting cap\n", inode); > - return ret; > + goto out; > } > > if (!(got & want)) { > dout("start_read %p, no cache cap\n", inode); > - return -EACCES; > + ret = -EACCES; > + goto out; > + } > + if (ret == 0) { > + ret = -EACCES; > + goto out; > } > - if (ret == 0) > - return -EACCES; > > - rreq->netfs_priv = (void *)(uintptr_t)got; > - return 0; > + priv->caps = got; > + rreq->netfs_priv = priv; > + > +out: > + if (ret) > + kfree(priv); > + > + return ret; > } > > static void ceph_netfs_free_request(struct netfs_io_request *rreq) > { > - struct ceph_inode_info *ci = ceph_inode(rreq->inode); > - int got = (uintptr_t)rreq->netfs_priv; > + struct ceph_netfs_request_data *priv = rreq->netfs_priv; > + > + if (!priv) > + return; > > - if (got) > - ceph_put_cap_refs(ci, got); > + ceph_put_cap_refs(ceph_inode(rreq->inode), priv->caps); > + kfree(priv); > + rreq->netfs_priv = NULL; > } > > const struct netfs_request_ops ceph_netfs_ops = { > diff --git a/fs/ceph/super.h b/fs/ceph/super.h > index a226d36b3ecb..1233f53f6e0b 100644 > --- a/fs/ceph/super.h > +++ b/fs/ceph/super.h > @@ -470,6 +470,19 @@ struct ceph_inode_info { > #endif > }; > > +struct ceph_netfs_request_data { > + int caps; > + > + /* > + * Maximum size of a file readahead request. > + * The posix_fadvise could update the bdi's default ra_pages. > + */ > + unsigned int file_ra_pages; > + > + /* Set it if posix_fadvise disables file readahead entirely */ > + bool file_ra_disabled; > +}; > + > static inline struct ceph_inode_info * > ceph_inode(const struct inode *inode) > { > -- > 2.40.0 >
On 5/12/23 22:13, 胡玮文 wrote: > On Thu, May 11, 2023 at 11:03:34AM +0800, xiubli@redhat.com wrote: >> From: Xiubo Li <xiubli@redhat.com> >> >> We need to save the 'f_ra.ra_pages' to expand the readahead window >> later. >> >> Cc: stable@vger.kernel.org >> Fixes: 49870056005c ("ceph: convert ceph_readpages to ceph_readahead") >> URL: https://lore.kernel.org/ceph-devel/20230504082510.247-1-sehuww@mail.scut.edu.cn >> URL: https://www.spinics.net/lists/ceph-users/msg76183.html >> Cc: Hu Weiwen <sehuww@mail.scut.edu.cn> >> Signed-off-by: Xiubo Li <xiubli@redhat.com> >> --- >> fs/ceph/addr.c | 43 ++++++++++++++++++++++++++++++++----------- >> fs/ceph/super.h | 13 +++++++++++++ >> 2 files changed, 45 insertions(+), 11 deletions(-) >> >> diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c >> index 3b20873733af..db55fce13324 100644 >> --- a/fs/ceph/addr.c >> +++ b/fs/ceph/addr.c >> @@ -404,18 +404,27 @@ static int ceph_init_request(struct netfs_io_request *rreq, struct file *file) >> { >> struct inode *inode = rreq->inode; >> int got = 0, want = CEPH_CAP_FILE_CACHE; >> + struct ceph_netfs_request_data *priv; >> int ret = 0; >> >> if (rreq->origin != NETFS_READAHEAD) >> return 0; >> >> + priv = kzalloc(sizeof(*priv), GFP_NOFS); >> + if (!priv) >> + return -ENOMEM; >> + >> if (file) { >> struct ceph_rw_context *rw_ctx; >> struct ceph_file_info *fi = file->private_data; >> >> rw_ctx = ceph_find_rw_context(fi); >> - if (rw_ctx) >> + if (rw_ctx) { >> + kfree(priv); >> return 0; > This is not working. When reaching here by read() system call, we always > have non-null rw_ctx. (As I read the code and also verified with gdb) > ceph_add_rw_context() is invoked in ceph_read_iter(). This should work: diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c index e1bf90059112..d3e37e01c3d0 100644 --- a/fs/ceph/addr.c +++ b/fs/ceph/addr.c @@ -444,13 +444,14 @@ static int ceph_init_request(struct netfs_io_request *rreq, struct file *file) struct ceph_rw_context *rw_ctx; struct ceph_file_info *fi = file->private_data; + priv->file_ra_pages = file->f_ra.ra_pages; + priv->file_ra_disabled = file->f_mode & FMODE_RANDOM; + rw_ctx = ceph_find_rw_context(fi); if (rw_ctx) { - kfree(priv); + rreq->netfs_priv = priv; return 0; } - priv->file_ra_pages = file->f_ra.ra_pages; - priv->file_ra_disabled = !!(file->f_mode & FMODE_RANDOM); } /* Thanks - Xiubo >> + } >> + priv->file_ra_pages = file->f_ra.ra_pages; >> + priv->file_ra_disabled = !!(file->f_mode & FMODE_RANDOM); > '!!' is not needed. From coding-style.rst: "When using bool types the > !! construction is not needed, which eliminates a class of bugs". > > Thanks > Hu Weiwen > >> } >> >> /* >> @@ -425,27 +434,39 @@ static int ceph_init_request(struct netfs_io_request *rreq, struct file *file) >> ret = ceph_try_get_caps(inode, CEPH_CAP_FILE_RD, want, true, &got); >> if (ret < 0) { >> dout("start_read %p, error getting cap\n", inode); >> - return ret; >> + goto out; >> } >> >> if (!(got & want)) { >> dout("start_read %p, no cache cap\n", inode); >> - return -EACCES; >> + ret = -EACCES; >> + goto out; >> + } >> + if (ret == 0) { >> + ret = -EACCES; >> + goto out; >> } >> - if (ret == 0) >> - return -EACCES; >> >> - rreq->netfs_priv = (void *)(uintptr_t)got; >> - return 0; >> + priv->caps = got; >> + rreq->netfs_priv = priv; >> + >> +out: >> + if (ret) >> + kfree(priv); >> + >> + return ret; >> } >> >> static void ceph_netfs_free_request(struct netfs_io_request *rreq) >> { >> - struct ceph_inode_info *ci = ceph_inode(rreq->inode); >> - int got = (uintptr_t)rreq->netfs_priv; >> + struct ceph_netfs_request_data *priv = rreq->netfs_priv; >> + >> + if (!priv) >> + return; >> >> - if (got) >> - ceph_put_cap_refs(ci, got); >> + ceph_put_cap_refs(ceph_inode(rreq->inode), priv->caps); >> + kfree(priv); >> + rreq->netfs_priv = NULL; >> } >> >> const struct netfs_request_ops ceph_netfs_ops = { >> diff --git a/fs/ceph/super.h b/fs/ceph/super.h >> index a226d36b3ecb..1233f53f6e0b 100644 >> --- a/fs/ceph/super.h >> +++ b/fs/ceph/super.h >> @@ -470,6 +470,19 @@ struct ceph_inode_info { >> #endif >> }; >> >> +struct ceph_netfs_request_data { >> + int caps; >> + >> + /* >> + * Maximum size of a file readahead request. >> + * The posix_fadvise could update the bdi's default ra_pages. >> + */ >> + unsigned int file_ra_pages; >> + >> + /* Set it if posix_fadvise disables file readahead entirely */ >> + bool file_ra_disabled; >> +}; >> + >> static inline struct ceph_inode_info * >> ceph_inode(const struct inode *inode) >> { >> -- >> 2.40.0 >>
diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c index 3b20873733af..db55fce13324 100644 --- a/fs/ceph/addr.c +++ b/fs/ceph/addr.c @@ -404,18 +404,27 @@ static int ceph_init_request(struct netfs_io_request *rreq, struct file *file) { struct inode *inode = rreq->inode; int got = 0, want = CEPH_CAP_FILE_CACHE; + struct ceph_netfs_request_data *priv; int ret = 0; if (rreq->origin != NETFS_READAHEAD) return 0; + priv = kzalloc(sizeof(*priv), GFP_NOFS); + if (!priv) + return -ENOMEM; + if (file) { struct ceph_rw_context *rw_ctx; struct ceph_file_info *fi = file->private_data; rw_ctx = ceph_find_rw_context(fi); - if (rw_ctx) + if (rw_ctx) { + kfree(priv); return 0; + } + priv->file_ra_pages = file->f_ra.ra_pages; + priv->file_ra_disabled = !!(file->f_mode & FMODE_RANDOM); } /* @@ -425,27 +434,39 @@ static int ceph_init_request(struct netfs_io_request *rreq, struct file *file) ret = ceph_try_get_caps(inode, CEPH_CAP_FILE_RD, want, true, &got); if (ret < 0) { dout("start_read %p, error getting cap\n", inode); - return ret; + goto out; } if (!(got & want)) { dout("start_read %p, no cache cap\n", inode); - return -EACCES; + ret = -EACCES; + goto out; + } + if (ret == 0) { + ret = -EACCES; + goto out; } - if (ret == 0) - return -EACCES; - rreq->netfs_priv = (void *)(uintptr_t)got; - return 0; + priv->caps = got; + rreq->netfs_priv = priv; + +out: + if (ret) + kfree(priv); + + return ret; } static void ceph_netfs_free_request(struct netfs_io_request *rreq) { - struct ceph_inode_info *ci = ceph_inode(rreq->inode); - int got = (uintptr_t)rreq->netfs_priv; + struct ceph_netfs_request_data *priv = rreq->netfs_priv; + + if (!priv) + return; - if (got) - ceph_put_cap_refs(ci, got); + ceph_put_cap_refs(ceph_inode(rreq->inode), priv->caps); + kfree(priv); + rreq->netfs_priv = NULL; } const struct netfs_request_ops ceph_netfs_ops = { diff --git a/fs/ceph/super.h b/fs/ceph/super.h index a226d36b3ecb..1233f53f6e0b 100644 --- a/fs/ceph/super.h +++ b/fs/ceph/super.h @@ -470,6 +470,19 @@ struct ceph_inode_info { #endif }; +struct ceph_netfs_request_data { + int caps; + + /* + * Maximum size of a file readahead request. + * The posix_fadvise could update the bdi's default ra_pages. + */ + unsigned int file_ra_pages; + + /* Set it if posix_fadvise disables file readahead entirely */ + bool file_ra_disabled; +}; + static inline struct ceph_inode_info * ceph_inode(const struct inode *inode) {