From: Andreas Gruenbacher <agruenba@redhat.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andreas Gruenbacher <agruenba@redhat.com>,
cluster-devel@redhat.com, linux-kernel@vger.kernel.org,
Alexander Viro <viro@zeniv.linux.org.uk>, Jan Kara <jack@suse.cz>,
Matthew Wilcox <willy@infradead.org>
Subject: [RFC 1/9] gfs2: Clean up the error handling in gfs2_page_mkwrite
Date: Mon, 31 May 2021 19:01:15 +0200 [thread overview]
Message-ID: <20210531170123.243771-2-agruenba@redhat.com> (raw)
In-Reply-To: <20210531170123.243771-1-agruenba@redhat.com>
We're setting an error number so that block_page_mkwrite_return
translates it into the corresponding VM_FAULT_* code in several places,
but this is getting confusing, so set the VM_FAULT_* codes directly
instead. (No change in functionality.)
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
fs/gfs2/file.c | 63 ++++++++++++++++++++++++++++++++------------------
1 file changed, 40 insertions(+), 23 deletions(-)
diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index 8a35a0196b6d..0eb235728098 100644
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -427,22 +427,25 @@ static vm_fault_t gfs2_page_mkwrite(struct vm_fault *vmf)
struct gfs2_alloc_parms ap = { .aflags = 0, };
u64 offset = page_offset(page);
unsigned int data_blocks, ind_blocks, rblocks;
+ vm_fault_t ret = VM_FAULT_LOCKED;
struct gfs2_holder gh;
unsigned int length;
loff_t size;
- int ret;
+ int err;
sb_start_pagefault(inode->i_sb);
gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
- ret = gfs2_glock_nq(&gh);
- if (ret)
+ err = gfs2_glock_nq(&gh);
+ if (err) {
+ ret = block_page_mkwrite_return(err);
goto out_uninit;
+ }
/* Check page index against inode size */
size = i_size_read(inode);
if (offset >= size) {
- ret = -EINVAL;
+ ret = VM_FAULT_SIGBUS;
goto out_unlock;
}
@@ -469,24 +472,30 @@ static vm_fault_t gfs2_page_mkwrite(struct vm_fault *vmf)
!gfs2_write_alloc_required(ip, offset, length)) {
lock_page(page);
if (!PageUptodate(page) || page->mapping != inode->i_mapping) {
- ret = -EAGAIN;
+ ret = VM_FAULT_NOPAGE;
unlock_page(page);
}
goto out_unlock;
}
- ret = gfs2_rindex_update(sdp);
- if (ret)
+ err = gfs2_rindex_update(sdp);
+ if (err) {
+ ret = block_page_mkwrite_return(err);
goto out_unlock;
+ }
gfs2_write_calc_reserv(ip, length, &data_blocks, &ind_blocks);
ap.target = data_blocks + ind_blocks;
- ret = gfs2_quota_lock_check(ip, &ap);
- if (ret)
+ err = gfs2_quota_lock_check(ip, &ap);
+ if (err) {
+ ret = block_page_mkwrite_return(err);
goto out_unlock;
- ret = gfs2_inplace_reserve(ip, &ap);
- if (ret)
+ }
+ err = gfs2_inplace_reserve(ip, &ap);
+ if (err) {
+ ret = block_page_mkwrite_return(err);
goto out_quota_unlock;
+ }
rblocks = RES_DINODE + ind_blocks;
if (gfs2_is_jdata(ip))
@@ -495,27 +504,35 @@ static vm_fault_t gfs2_page_mkwrite(struct vm_fault *vmf)
rblocks += RES_STATFS + RES_QUOTA;
rblocks += gfs2_rg_blocks(ip, data_blocks + ind_blocks);
}
- ret = gfs2_trans_begin(sdp, rblocks, 0);
- if (ret)
+ err = gfs2_trans_begin(sdp, rblocks, 0);
+ if (err) {
+ ret = block_page_mkwrite_return(err);
goto out_trans_fail;
+ }
lock_page(page);
- ret = -EAGAIN;
/* If truncated, we must retry the operation, we may have raced
* with the glock demotion code.
*/
- if (!PageUptodate(page) || page->mapping != inode->i_mapping)
+ if (!PageUptodate(page) || page->mapping != inode->i_mapping) {
+ ret = VM_FAULT_NOPAGE;
goto out_trans_end;
+ }
/* Unstuff, if required, and allocate backing blocks for page */
- ret = 0;
- if (gfs2_is_stuffed(ip))
- ret = gfs2_unstuff_dinode(ip, page);
- if (ret == 0)
- ret = gfs2_allocate_page_backing(page, length);
+ if (gfs2_is_stuffed(ip)) {
+ err = gfs2_unstuff_dinode(ip, page);
+ if (err) {
+ ret = block_page_mkwrite_return(err);
+ goto out_trans_end;
+ }
+ }
+ err = gfs2_allocate_page_backing(page, length);
+ if (err)
+ ret = block_page_mkwrite_return(err);
out_trans_end:
- if (ret)
+ if (ret != VM_FAULT_LOCKED)
unlock_page(page);
gfs2_trans_end(sdp);
out_trans_fail:
@@ -526,12 +543,12 @@ static vm_fault_t gfs2_page_mkwrite(struct vm_fault *vmf)
gfs2_glock_dq(&gh);
out_uninit:
gfs2_holder_uninit(&gh);
- if (ret == 0) {
+ if (ret == VM_FAULT_LOCKED) {
set_page_dirty(page);
wait_for_stable_page(page);
}
sb_end_pagefault(inode->i_sb);
- return block_page_mkwrite_return(ret);
+ return ret;
}
static vm_fault_t gfs2_fault(struct vm_fault *vmf)
--
2.26.3
WARNING: multiple messages have this Message-ID (diff)
From: Andreas Gruenbacher <agruenba@redhat.com>
To: cluster-devel.redhat.com
Subject: [Cluster-devel] [RFC 1/9] gfs2: Clean up the error handling in gfs2_page_mkwrite
Date: Mon, 31 May 2021 19:01:15 +0200 [thread overview]
Message-ID: <20210531170123.243771-2-agruenba@redhat.com> (raw)
In-Reply-To: <20210531170123.243771-1-agruenba@redhat.com>
We're setting an error number so that block_page_mkwrite_return
translates it into the corresponding VM_FAULT_* code in several places,
but this is getting confusing, so set the VM_FAULT_* codes directly
instead. (No change in functionality.)
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
fs/gfs2/file.c | 63 ++++++++++++++++++++++++++++++++------------------
1 file changed, 40 insertions(+), 23 deletions(-)
diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index 8a35a0196b6d..0eb235728098 100644
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -427,22 +427,25 @@ static vm_fault_t gfs2_page_mkwrite(struct vm_fault *vmf)
struct gfs2_alloc_parms ap = { .aflags = 0, };
u64 offset = page_offset(page);
unsigned int data_blocks, ind_blocks, rblocks;
+ vm_fault_t ret = VM_FAULT_LOCKED;
struct gfs2_holder gh;
unsigned int length;
loff_t size;
- int ret;
+ int err;
sb_start_pagefault(inode->i_sb);
gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
- ret = gfs2_glock_nq(&gh);
- if (ret)
+ err = gfs2_glock_nq(&gh);
+ if (err) {
+ ret = block_page_mkwrite_return(err);
goto out_uninit;
+ }
/* Check page index against inode size */
size = i_size_read(inode);
if (offset >= size) {
- ret = -EINVAL;
+ ret = VM_FAULT_SIGBUS;
goto out_unlock;
}
@@ -469,24 +472,30 @@ static vm_fault_t gfs2_page_mkwrite(struct vm_fault *vmf)
!gfs2_write_alloc_required(ip, offset, length)) {
lock_page(page);
if (!PageUptodate(page) || page->mapping != inode->i_mapping) {
- ret = -EAGAIN;
+ ret = VM_FAULT_NOPAGE;
unlock_page(page);
}
goto out_unlock;
}
- ret = gfs2_rindex_update(sdp);
- if (ret)
+ err = gfs2_rindex_update(sdp);
+ if (err) {
+ ret = block_page_mkwrite_return(err);
goto out_unlock;
+ }
gfs2_write_calc_reserv(ip, length, &data_blocks, &ind_blocks);
ap.target = data_blocks + ind_blocks;
- ret = gfs2_quota_lock_check(ip, &ap);
- if (ret)
+ err = gfs2_quota_lock_check(ip, &ap);
+ if (err) {
+ ret = block_page_mkwrite_return(err);
goto out_unlock;
- ret = gfs2_inplace_reserve(ip, &ap);
- if (ret)
+ }
+ err = gfs2_inplace_reserve(ip, &ap);
+ if (err) {
+ ret = block_page_mkwrite_return(err);
goto out_quota_unlock;
+ }
rblocks = RES_DINODE + ind_blocks;
if (gfs2_is_jdata(ip))
@@ -495,27 +504,35 @@ static vm_fault_t gfs2_page_mkwrite(struct vm_fault *vmf)
rblocks += RES_STATFS + RES_QUOTA;
rblocks += gfs2_rg_blocks(ip, data_blocks + ind_blocks);
}
- ret = gfs2_trans_begin(sdp, rblocks, 0);
- if (ret)
+ err = gfs2_trans_begin(sdp, rblocks, 0);
+ if (err) {
+ ret = block_page_mkwrite_return(err);
goto out_trans_fail;
+ }
lock_page(page);
- ret = -EAGAIN;
/* If truncated, we must retry the operation, we may have raced
* with the glock demotion code.
*/
- if (!PageUptodate(page) || page->mapping != inode->i_mapping)
+ if (!PageUptodate(page) || page->mapping != inode->i_mapping) {
+ ret = VM_FAULT_NOPAGE;
goto out_trans_end;
+ }
/* Unstuff, if required, and allocate backing blocks for page */
- ret = 0;
- if (gfs2_is_stuffed(ip))
- ret = gfs2_unstuff_dinode(ip, page);
- if (ret == 0)
- ret = gfs2_allocate_page_backing(page, length);
+ if (gfs2_is_stuffed(ip)) {
+ err = gfs2_unstuff_dinode(ip, page);
+ if (err) {
+ ret = block_page_mkwrite_return(err);
+ goto out_trans_end;
+ }
+ }
+ err = gfs2_allocate_page_backing(page, length);
+ if (err)
+ ret = block_page_mkwrite_return(err);
out_trans_end:
- if (ret)
+ if (ret != VM_FAULT_LOCKED)
unlock_page(page);
gfs2_trans_end(sdp);
out_trans_fail:
@@ -526,12 +543,12 @@ static vm_fault_t gfs2_page_mkwrite(struct vm_fault *vmf)
gfs2_glock_dq(&gh);
out_uninit:
gfs2_holder_uninit(&gh);
- if (ret == 0) {
+ if (ret == VM_FAULT_LOCKED) {
set_page_dirty(page);
wait_for_stable_page(page);
}
sb_end_pagefault(inode->i_sb);
- return block_page_mkwrite_return(ret);
+ return ret;
}
static vm_fault_t gfs2_fault(struct vm_fault *vmf)
--
2.26.3
next prev parent reply other threads:[~2021-05-31 17:09 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-31 17:01 [RFC 0/9] gfs2: handle page faults during read and write Andreas Gruenbacher
2021-05-31 17:01 ` [Cluster-devel] " Andreas Gruenbacher
2021-05-31 17:01 ` Andreas Gruenbacher [this message]
2021-05-31 17:01 ` [Cluster-devel] [RFC 1/9] gfs2: Clean up the error handling in gfs2_page_mkwrite Andreas Gruenbacher
2021-05-31 17:01 ` [RFC 2/9] gfs2: Add wrapper for iomap_file_buffered_write Andreas Gruenbacher
2021-05-31 17:01 ` [Cluster-devel] " Andreas Gruenbacher
2021-05-31 17:01 ` [RFC 3/9] gfs2: Add gfs2_holder_is_compatible helper Andreas Gruenbacher
2021-05-31 17:01 ` [Cluster-devel] " Andreas Gruenbacher
2021-05-31 17:01 ` [RFC 4/9] gfs2: Fix mmap + page fault deadlocks (part 1) Andreas Gruenbacher
2021-05-31 17:01 ` [Cluster-devel] " Andreas Gruenbacher
2021-06-01 6:00 ` Linus Torvalds
2021-06-01 6:00 ` [Cluster-devel] " Linus Torvalds
2021-06-02 11:16 ` Andreas Gruenbacher
2021-06-02 11:16 ` [Cluster-devel] " Andreas Gruenbacher
2021-06-11 16:25 ` Al Viro
2021-06-11 16:25 ` [Cluster-devel] " Al Viro
2021-06-12 21:05 ` Al Viro
2021-06-12 21:05 ` [Cluster-devel] " Al Viro
2021-06-12 21:35 ` Al Viro
2021-06-12 21:35 ` [Cluster-devel] " Al Viro
2021-06-13 8:44 ` Steven Whitehouse
2021-06-13 8:44 ` Steven Whitehouse
2021-05-31 17:01 ` [RFC 5/9] iov_iter: Add iov_iter_fault_in_writeable() Andreas Gruenbacher
2021-05-31 17:01 ` [Cluster-devel] " Andreas Gruenbacher
2021-05-31 17:12 ` Al Viro
2021-05-31 17:12 ` [Cluster-devel] " Al Viro
2021-06-12 21:12 ` Al Viro
2021-06-12 21:12 ` [Cluster-devel] " Al Viro
2021-06-12 21:33 ` Linus Torvalds
2021-06-12 21:33 ` [Cluster-devel] " Linus Torvalds
2021-06-12 21:47 ` Al Viro
2021-06-12 21:47 ` [Cluster-devel] " Al Viro
2021-06-12 23:17 ` Linus Torvalds
2021-06-12 23:17 ` [Cluster-devel] " Linus Torvalds
2021-06-12 23:38 ` Al Viro
2021-06-12 23:38 ` [Cluster-devel] " Al Viro
2021-05-31 17:01 ` [RFC 6/9] gfs2: Add wrappers for accessing journal_info Andreas Gruenbacher
2021-05-31 17:01 ` [Cluster-devel] " Andreas Gruenbacher
2021-05-31 17:01 ` [RFC 7/9] gfs2: Encode glock holding and retry flags in journal_info Andreas Gruenbacher
2021-05-31 17:01 ` [Cluster-devel] " Andreas Gruenbacher
2021-05-31 17:01 ` [RFC 8/9] gfs2: Add LM_FLAG_OUTER glock holder flag Andreas Gruenbacher
2021-05-31 17:01 ` [Cluster-devel] " Andreas Gruenbacher
2021-05-31 17:01 ` [RFC 9/9] gfs2: Fix mmap + page fault deadlocks (part 2) Andreas Gruenbacher
2021-05-31 17:01 ` [Cluster-devel] " Andreas Gruenbacher
2021-06-01 5:47 ` Linus Torvalds
2021-06-01 5:47 ` [Cluster-devel] " Linus Torvalds
2021-05-31 17:57 ` [Cluster-devel] [RFC 0/9] gfs2: handle page faults during read and write Linus Torvalds
2021-05-31 20:35 ` Andreas Gruenbacher
2021-05-31 20:35 ` [Cluster-devel] " Andreas Gruenbacher
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