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Tue, 26 Aug 2025 10:35:06 +0800 From: =?utf-8?B?Qm8gTGl1ICjliJjms6IpLea1qua9ruS/oeaBrw==?= To: "hsiangkao@linux.alibaba.com" , "xiang@kernel.org" , "chao@kernel.org" CC: "linux-kernel@vger.kernel.org" , "linux-erofs@lists.ozlabs.org" Subject: Re: [PATCH] erofs: Add support for FS_IOC_GETFSLABEL Thread-Topic: [PATCH] erofs: Add support for FS_IOC_GETFSLABEL Thread-Index: AQHcFbi6Z9avxkNOEkmUEK8mQ5/cJrRzqx4AgACLdxA= Date: Tue, 26 Aug 2025 02:35:06 +0000 Message-ID: <63904ade56634923ba734dcdab3c45d0@inspur.com> References: <0bbd64f3599557766ff53c108794355026-8-25linux.alibaba.com@g.corp-email.com> <9251e366-06ea-405d-9980-e90c1a48aaaa@linux.alibaba.com> In-Reply-To: <9251e366-06ea-405d-9980-e90c1a48aaaa@linux.alibaba.com> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: yes X-MS-TNEF-Correlator: Content-Type: multipart/signed; micalg=SHA1; protocol="application/x-pkcs7-signature"; boundary="----=_NextPart_000_0025_01DC1675.1629B8D0" Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 tUid: 20258261035072844308ecaa04445a43d29367e54b9ee X-Abuse-Reports-To: service@corp-email.com Abuse-Reports-To: service@corp-email.com X-Complaints-To: service@corp-email.com X-Report-Abuse-To: service@corp-email.com ------=_NextPart_000_0025_01DC1675.1629B8D0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit On 2025/8/26 10:09, Gao Xiang wrote: >On 2025/8/25 20:06, Bo Liu wrote: >> From: Bo Liu (OpenAnolis) >> >> Add support for reading to the erofs volume label from the >> FS_IOC_GETFSLABEL ioctls. >> >> Signed-off-by: Bo Liu (OpenAnolis) >> --- >> fs/erofs/Makefile | 2 +- >> fs/erofs/data.c | 4 ++++ >> fs/erofs/dir.c | 4 ++++ >> fs/erofs/inode.c | 2 +- >> fs/erofs/internal.h | 10 ++++++++++ >> fs/erofs/ioctl.c | 47 >+++++++++++++++++++++++++++++++++++++++++++++ >> fs/erofs/super.c | 2 ++ >> fs/erofs/zdata.c | 11 +++++++++++ >> 8 files changed, 80 insertions(+), 2 deletions(-) >> create mode 100644 fs/erofs/ioctl.c >> >> diff --git a/fs/erofs/Makefile b/fs/erofs/Makefile index >> 549abc424763..5be6cc4acc1c 100644 >> --- a/fs/erofs/Makefile >> +++ b/fs/erofs/Makefile >> @@ -1,7 +1,7 @@ >> # SPDX-License-Identifier: GPL-2.0-only >> >> obj-$(CONFIG_EROFS_FS) += erofs.o >> -erofs-objs := super.o inode.o data.o namei.o dir.o sysfs.o >> +erofs-objs := super.o inode.o data.o namei.o dir.o sysfs.o ioctl.o >> erofs-$(CONFIG_EROFS_FS_XATTR) += xattr.o >> erofs-$(CONFIG_EROFS_FS_ZIP) += decompressor.o zmap.o zdata.o zutil.o >> erofs-$(CONFIG_EROFS_FS_ZIP_LZMA) += decompressor_lzma.o diff --git >> a/fs/erofs/data.c b/fs/erofs/data.c index 3b1ba571c728..8ca29962a3dd >> 100644 >> --- a/fs/erofs/data.c >> +++ b/fs/erofs/data.c >> @@ -475,6 +475,10 @@ static loff_t erofs_file_llseek(struct file *file, >> loff_t >offset, int whence) >> const struct file_operations erofs_file_fops = { >> .llseek = erofs_file_llseek, >> .read_iter = erofs_file_read_iter, >> + .unlocked_ioctl = erofs_ioctl, >> +#ifdef CONFIG_COMPAT >> + .compat_ioctl = erofs_compat_ioctl, >> +#endif >> .mmap_prepare = erofs_file_mmap_prepare, >> .get_unmapped_area = thp_get_unmapped_area, >> .splice_read = filemap_splice_read, >> diff --git a/fs/erofs/dir.c b/fs/erofs/dir.c index >> debf469ad6bd..32b4f5aa60c9 100644 >> --- a/fs/erofs/dir.c >> +++ b/fs/erofs/dir.c >> @@ -123,4 +123,8 @@ const struct file_operations erofs_dir_fops = { >> .llseek = generic_file_llseek, >> .read = generic_read_dir, >> .iterate_shared = erofs_readdir, >> + .unlocked_ioctl = erofs_ioctl, >> +#ifdef CONFIG_COMPAT >> + .compat_ioctl = erofs_compat_ioctl, >> +#endif >> }; >> diff --git a/fs/erofs/inode.c b/fs/erofs/inode.c index >> 9a2f59721522..9248143e26df 100644 >> --- a/fs/erofs/inode.c >> +++ b/fs/erofs/inode.c >> @@ -214,7 +214,7 @@ static int erofs_fill_inode(struct inode *inode) >> case S_IFREG: >> inode->i_op = &erofs_generic_iops; >> if (erofs_inode_is_data_compressed(vi->datalayout)) >> - inode->i_fop = &generic_ro_fops; >> + inode->i_fop = &z_erofs_file_fops; > >Please also just use erofs_file_fops instead and adjust >erofs_file_read_iter() for example. > >> else >> inode->i_fop = &erofs_file_fops; >> break; >> diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h index >> 4ccc5f0ee8df..2f874b920c8b 100644 >> --- a/fs/erofs/internal.h >> +++ b/fs/erofs/internal.h >> @@ -32,6 +32,8 @@ __printf(2, 3) void _erofs_printk(struct super_block *sb, >const char *fmt, ...); >> #define DBG_BUGON(x) ((void)(x)) >> #endif /* !CONFIG_EROFS_FS_DEBUG */ >> >> +#define EROFS_VOLUME_LABEL_LEN 16 >> + >> /* EROFS_SUPER_MAGIC_V1 to represent the whole file system */ >> #define EROFS_SUPER_MAGIC EROFS_SUPER_MAGIC_V1 >> >> @@ -166,6 +168,9 @@ struct erofs_sb_info { >> struct erofs_domain *domain; >> char *fsid; >> char *domain_id; >> + >> + /* volume name */ >> + u8 volume_label[EROFS_VOLUME_LABEL_LEN]; > > char *volume_name; > >> }; >> >> #define EROFS_SB(sb) ((struct erofs_sb_info *)(sb)->s_fs_info) @@ >> -404,6 +409,7 @@ extern const struct inode_operations erofs_dir_iops; >> >> extern const struct file_operations erofs_file_fops; >> extern const struct file_operations erofs_dir_fops; >> +extern const struct file_operations z_erofs_file_fops; >> >> extern const struct iomap_ops z_erofs_iomap_report_ops; >> >> @@ -535,6 +541,10 @@ static inline struct bio >*erofs_fscache_bio_alloc(struct erofs_map_dev *mdev) { >> static inline void erofs_fscache_submit_bio(struct bio *bio) {} >> #endif >> >> +long erofs_ioctl(struct file *filp, unsigned int cmd, unsigned long >> +arg); long erofs_compat_ioctl(struct file *filp, unsigned int cmd, >> + unsigned long arg); >> + >> #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted >*/ >> >> #endif /* __EROFS_INTERNAL_H */ >> diff --git a/fs/erofs/ioctl.c b/fs/erofs/ioctl.c new file mode 100644 >> index 000000000000..10bfd593225f >> --- /dev/null >> +++ b/fs/erofs/ioctl.c >> @@ -0,0 +1,47 @@ >> +// SPDX-License-Identifier: GPL-2.0-or-later #include >> +#include #include >> + >> +#include "erofs_fs.h" >> +#include "internal.h" >> + >> +static int erofs_ioctl_get_volume_label(struct inode *inode, void >> +__user *arg) { >> + struct erofs_sb_info *sbi = EROFS_I_SB(inode); >> + size_t len; >> + int ret; >> + char label[EROFS_VOLUME_LABEL_LEN]; >> + >> + memcpy(label, sbi->volume_label, EROFS_VOLUME_LABEL_LEN); >> + >> + len = strnlen(label, EROFS_VOLUME_LABEL_LEN); >> + if (len == EROFS_VOLUME_LABEL_LEN) >> + erofs_err(inode->i_sb, "label is too long, return the first %zu >> bytes", >> + --len); > >No needed. > >> + >> + ret = copy_to_user(arg, label, len); > > > if (!sbi->volume_name) > ret = clear_user(arg, 1); > else > ret = copy_to_user(arg, sbi->volume_name, > strlen(sbi->volume_name)); > return ret ? -EFAULT : 0; > >... > >> + >> + return ret ? -EFAULT : 0; >> +} >> + >> +long erofs_ioctl(struct file *filp, unsigned int cmd, unsigned long >> +arg) { >> + struct inode *inode = file_inode(filp); >> + void __user *argp = (void __user *)arg; >> + >> + switch (cmd) { >> + case FS_IOC_GETFSLABEL: >> + return erofs_ioctl_get_volume_label(inode, argp); >> + default: >> + return -ENOTTY; >> + } >> +} >> + >> +#ifdef CONFIG_COMPAT >> +long erofs_compat_ioctl(struct file *filp, unsigned int cmd, >> + unsigned long arg) >> +{ >> + return erofs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg)); } >> +#endif >> diff --git a/fs/erofs/super.c b/fs/erofs/super.c index >> 1b529ace4db0..e6ad6cf4ba82 100644 >> --- a/fs/erofs/super.c >> +++ b/fs/erofs/super.c >> @@ -343,6 +343,8 @@ static int erofs_read_superblock(struct super_block >*sb) >> sbi->fixed_nsec = le32_to_cpu(dsb->fixed_nsec); >> super_set_uuid(sb, (void *)dsb->uuid, sizeof(dsb->uuid)); >> >> + memcpy(sbi->volume_label, dsb->volume_name, >EROFS_VOLUME_LABEL_LEN); > > if (dsb->volume_name[0]) { > sbi->volume_name = kstrndup(dsb->volume_name, >dsb->volume_name, GFP_KERNEL); > if (!sbi->volume_name) { > ... > } > } > >Need to kfree(sbi->volume_name) properly too. > >Thanks, >Gao Xiang > >> + >> /* parse on-disk compression configurations */ >> ret = z_erofs_parse_cfgs(sb, dsb); >> if (ret < 0) >> diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c index >> 2d73297003d2..b612bf7b2f08 100644 >> --- a/fs/erofs/zdata.c >> +++ b/fs/erofs/zdata.c >> @@ -1931,3 +1931,14 @@ const struct address_space_operations >z_erofs_aops = { >> .read_folio = z_erofs_read_folio, >> .readahead = z_erofs_readahead, >> }; >> + >> +const struct file_operations z_erofs_file_fops = { >> + .llseek = generic_file_llseek, >> + .read_iter = generic_file_read_iter, >> + .unlocked_ioctl = erofs_ioctl, >> +#ifdef CONFIG_COMPAT >> + .compat_ioctl = erofs_compat_ioctl, >> +#endif >> + .mmap = generic_file_readonly_mmap, >> + .splice_read = filemap_splice_read, >> +}; Thanks for your comments. I will send the next version of the patch later. 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