The patch below does not apply to the 4.9-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 7336905a89f19173bf9301cd50a24421162f417c Mon Sep 17 00:00:00 2001 From: Andreas Gruenbacher agruenba@redhat.com Date: Fri, 10 Dec 2021 14:43:36 +0100 Subject: [PATCH] gfs2: gfs2_setattr_size error path fix

When gfs2_setattr_size() fails, it calls gfs2_rs_delete(ip, NULL) to get rid of any reservations the inode may have. Instead, it should pass in the inode's write count as the second parameter to allow gfs2_rs_delete() to figure out if the inode has any writers left.

In a next step, there are two instances of gfs2_rs_delete(ip, NULL) left where we know that there can be no other users of the inode. Replace those with gfs2_rs_deltree(&ip->i_res) to avoid the unnecessary write count check.

With that, gfs2_rs_delete() is only called with the inode's actual write count, so get rid of the second parameter.

Fixes: a097dc7e24cb ("GFS2: Make rgrp reservations part of the gfs2_inode structure") Signed-off-by: Andreas Gruenbacher agruenba@redhat.com

diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c index d67108489148..fbdb7a30470a 100644 --- a/fs/gfs2/bmap.c +++ b/fs/gfs2/bmap.c @@ -2146,7 +2146,7 @@ int gfs2_setattr_size(struct inode *inode, u64 newsize)

ret = do_shrink(inode, newsize); out: - gfs2_rs_delete(ip, NULL); + gfs2_rs_delete(ip); gfs2_qa_put(ip); return ret; } diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c index 8c39a8571b1f..5bac4f6e8e05 100644 --- a/fs/gfs2/file.c +++ b/fs/gfs2/file.c @@ -706,7 +706,7 @@ static int gfs2_release(struct inode *inode, struct file *file)

if (file->f_mode & FMODE_WRITE) { if (gfs2_rs_active(&ip->i_res)) - gfs2_rs_delete(ip, &inode->i_writecount); + gfs2_rs_delete(ip); gfs2_qa_put(ip); } return 0; diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c index 89905f4f29bb..66a123306aec 100644 --- a/fs/gfs2/inode.c +++ b/fs/gfs2/inode.c @@ -793,7 +793,7 @@ static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, if (free_vfs_inode) /* else evict will do the put for us */ gfs2_glock_put(ip->i_gl); } - gfs2_rs_delete(ip, NULL); + gfs2_rs_deltree(&ip->i_res); gfs2_qa_put(ip); fail_free_acls: posix_acl_release(default_acl); diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c index 9b04a570c582..9df8a84f85a6 100644 --- a/fs/gfs2/rgrp.c +++ b/fs/gfs2/rgrp.c @@ -680,13 +680,14 @@ void gfs2_rs_deltree(struct gfs2_blkreserv *rs) /** * gfs2_rs_delete - delete a multi-block reservation * @ip: The inode for this reservation - * @wcount: The inode's write count, or NULL * */ -void gfs2_rs_delete(struct gfs2_inode *ip, atomic_t *wcount) +void gfs2_rs_delete(struct gfs2_inode *ip) { + struct inode *inode = &ip->i_inode; + down_write(&ip->i_rw_mutex); - if ((wcount == NULL) || (atomic_read(wcount) <= 1)) + if (atomic_read(&inode->i_writecount) <= 1) gfs2_rs_deltree(&ip->i_res); up_write(&ip->i_rw_mutex); } diff --git a/fs/gfs2/rgrp.h b/fs/gfs2/rgrp.h index 3e2ca1fb4305..46dd94e9e085 100644 --- a/fs/gfs2/rgrp.h +++ b/fs/gfs2/rgrp.h @@ -45,7 +45,7 @@ extern int gfs2_alloc_blocks(struct gfs2_inode *ip, u64 *bn, unsigned int *n, bool dinode, u64 *generation);

extern void gfs2_rs_deltree(struct gfs2_blkreserv *rs); -extern void gfs2_rs_delete(struct gfs2_inode *ip, atomic_t *wcount); +extern void gfs2_rs_delete(struct gfs2_inode *ip); extern void __gfs2_free_blocks(struct gfs2_inode *ip, struct gfs2_rgrpd *rgd, u64 bstart, u32 blen, int meta); extern void gfs2_free_meta(struct gfs2_inode *ip, struct gfs2_rgrpd *rgd, diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c index 64c67090f503..143a47359d1b 100644 --- a/fs/gfs2/super.c +++ b/fs/gfs2/super.c @@ -1396,7 +1396,7 @@ static void gfs2_evict_inode(struct inode *inode) truncate_inode_pages_final(&inode->i_data); if (ip->i_qadata) gfs2_assert_warn(sdp, ip->i_qadata->qa_ref == 0); - gfs2_rs_delete(ip, NULL); + gfs2_rs_deltree(&ip->i_res); gfs2_ordered_del_inode(ip); clear_inode(inode); gfs2_dir_hash_inval(ip);