btrfs: use kvzalloc to allocate btrfs_fs_info
[ Upstream commit a8fd1f7174
]
The srcu_struct in btrfs_fs_info scales in size with NR_CPUS. On
kernels built with NR_CPUS=8192, this can result in kmalloc failures
that prevent mounting.
There is work in progress to try to resolve this for every user of
srcu_struct but using kvzalloc will work around the failures until
that is complete.
As an example with NR_CPUS=512 on x86_64: the overall size of
subvol_srcu is 3460 bytes, fs_info is 6496.
Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
parent
acb162b9cd
commit
b114296692
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@ -2969,7 +2969,7 @@ static inline void free_fs_info(struct btrfs_fs_info *fs_info)
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kfree(fs_info->super_copy);
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kfree(fs_info->super_copy);
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kfree(fs_info->super_for_commit);
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kfree(fs_info->super_for_commit);
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security_free_mnt_opts(&fs_info->security_opts);
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security_free_mnt_opts(&fs_info->security_opts);
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kfree(fs_info);
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kvfree(fs_info);
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}
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}
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/* tree mod log functions from ctree.c */
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/* tree mod log functions from ctree.c */
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@ -1581,7 +1581,7 @@ static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags,
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* it for searching for existing supers, so this lets us do that and
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* it for searching for existing supers, so this lets us do that and
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* then open_ctree will properly initialize everything later.
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* then open_ctree will properly initialize everything later.
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*/
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*/
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fs_info = kzalloc(sizeof(struct btrfs_fs_info), GFP_KERNEL);
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fs_info = kvzalloc(sizeof(struct btrfs_fs_info), GFP_KERNEL);
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if (!fs_info) {
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if (!fs_info) {
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error = -ENOMEM;
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error = -ENOMEM;
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goto error_sec_opts;
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goto error_sec_opts;
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