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brauner@kernel.org, bsegall@google.com, corbet@lwn.net, dave.hansen@linux.intel.com, david@redhat.com, dietmar.eggemann@arm.com, ebiederm@xmission.com, hpa@zytor.com, jakub.wartak@mailbox.org, jannh@google.com, juri.lelli@redhat.com, khalid@kernel.org, liam.howlett@oracle.com, linyongting@bytedance.com, lorenzo.stoakes@oracle.com, luto@kernel.org, markhemm@googlemail.com, maz@kernel.org, mhiramat@kernel.org, mgorman@suse.de, mhocko@suse.com, mingo@redhat.com, muchun.song@linux.dev, neilb@suse.de, osalvador@suse.de, pcc@google.com, peterz@infradead.org, pfalcato@suse.de, rostedt@goodmis.org, rppt@kernel.org, shakeel.butt@linux.dev, surenb@google.com, tglx@linutronix.de, vasily.averin@linux.dev, vbabka@suse.cz, vincent.guittot@linaro.org, viro@zeniv.linux.org.uk, vschneid@redhat.com, willy@infradead.org, x86@kernel.org, xhao@linux.alibaba.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org Subject: [PATCH v3 05/22] mm/mshare: add ways to set the size 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Tt0P8eOB5Pk1oZF6VuxBNE1o1LDyGUrmGm+q6CmZZIhfkyMRg+sS0ChE49zbM1pRrlPeGFFL4/oEuPFRYsopPnTE1mY5/8BY3cbVMzvWV5acps99ZrASJX0IwH6P8k0RCemTcaxTBKGA4w+I63QWDuE9A7yY5AmCVrcpoODrpKgKJuxNjPPSrKnTa6mXXx6ICZ9JwuiOH4MgaynceA+s9PWCgzYuI9dyyEO48y9rfvAGRVR7Y898Sa8jvVxq66LeUKOpy X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Add file and inode operations to allow the size of an mshare region to be set fallocate() or ftruncate(). Signed-off-by: Anthony Yznaga --- mm/mshare.c | 87 ++++++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 86 insertions(+), 1 deletion(-) diff --git a/mm/mshare.c b/mm/mshare.c index 400f198c0791..bf859b176e09 100644 --- a/mm/mshare.c +++ b/mm/mshare.c @@ -16,19 +16,78 @@ #include #include #include +#include const unsigned long mshare_align = P4D_SIZE; +#define MSHARE_INITIALIZED 0x1 + struct mshare_data { struct mm_struct *mm; refcount_t ref; + unsigned long size; + unsigned long flags; }; +static inline bool mshare_is_initialized(struct mshare_data *m_data) +{ + return test_bit(MSHARE_INITIALIZED, &m_data->flags); +} + +static int msharefs_set_size(struct mshare_data *m_data, unsigned long size) +{ + int error = -EINVAL; + + if (mshare_is_initialized(m_data)) + goto out; + + if (m_data->size || (size & (mshare_align - 1))) + goto out; + + m_data->mm->task_size = m_data->size = size; + + set_bit(MSHARE_INITIALIZED, &m_data->flags); + error = 0; +out: + return error; +} + +static long msharefs_fallocate(struct file *file, int mode, loff_t offset, + loff_t len) +{ + struct inode *inode = file_inode(file); + struct mshare_data *m_data = inode->i_private; + int error; + + if (mode != FALLOC_FL_ALLOCATE_RANGE) + return -EOPNOTSUPP; + + if (offset) + return -EINVAL; + + inode_lock(inode); + + error = inode_newsize_ok(inode, len); + if (error) + goto out; + + error = msharefs_set_size(m_data, len); + if (error) + goto out; + + i_size_write(inode, len); +out: + inode_unlock(inode); + + return error; +} + static const struct inode_operations msharefs_dir_inode_ops; static const struct inode_operations msharefs_file_inode_ops; static const struct file_operations msharefs_file_operations = { .open = simple_open, + .fallocate = msharefs_fallocate, }; static int @@ -128,6 +187,32 @@ msharefs_mknod(struct mnt_idmap *idmap, struct inode *dir, return 0; } +static int msharefs_setattr(struct mnt_idmap *idmap, + struct dentry *dentry, struct iattr *attr) +{ + struct inode *inode = d_inode(dentry); + struct mshare_data *m_data = inode->i_private; + unsigned int ia_valid = attr->ia_valid; + int error; + + error = setattr_prepare(idmap, dentry, attr); + if (error) + return error; + + if (ia_valid & ATTR_SIZE) { + loff_t newsize = attr->ia_size; + + error = msharefs_set_size(m_data, newsize); + if (error) + return error; + + i_size_write(inode, newsize); + } + + setattr_copy(idmap, inode, attr); + return 0; +} + static int msharefs_create(struct mnt_idmap *idmap, struct inode *dir, struct dentry *dentry, umode_t mode, bool excl) @@ -182,7 +267,7 @@ msharefs_unlink(struct inode *dir, struct dentry *dentry) } static const struct inode_operations msharefs_file_inode_ops = { - .setattr = simple_setattr, + .setattr = msharefs_setattr, }; static const struct inode_operations msharefs_dir_inode_ops = { -- 2.47.1