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Diffstat (limited to 'fs/hostfs/hostfs_kern.c')
-rw-r--r--fs/hostfs/hostfs_kern.c116
1 files changed, 56 insertions, 60 deletions
diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c
index 7e51d2cec64b..01e516175bcd 100644
--- a/fs/hostfs/hostfs_kern.c
+++ b/fs/hostfs/hostfs_kern.c
@@ -33,6 +33,7 @@ struct hostfs_inode_info {
struct inode vfs_inode;
struct mutex open_mutex;
dev_t dev;
+ struct hostfs_timespec btime;
};
static inline struct hostfs_inode_info *HOSTFS_I(struct inode *inode)
@@ -95,32 +96,17 @@ __uml_setup("hostfs=", hostfs_args,
static char *__dentry_name(struct dentry *dentry, char *name)
{
char *p = dentry_path_raw(dentry, name, PATH_MAX);
- char *root;
- size_t len;
- struct hostfs_fs_info *fsi;
+ struct hostfs_fs_info *fsi = dentry->d_sb->s_fs_info;
+ char *root = fsi->host_root_path;
+ size_t len = strlen(root);
- fsi = dentry->d_sb->s_fs_info;
- root = fsi->host_root_path;
- len = strlen(root);
- if (IS_ERR(p)) {
+ if (IS_ERR(p) || len > p - name) {
__putname(name);
return NULL;
}
- /*
- * This function relies on the fact that dentry_path_raw() will place
- * the path name at the end of the provided buffer.
- */
- BUG_ON(p + strlen(p) + 1 != name + PATH_MAX);
-
- strscpy(name, root, PATH_MAX);
- if (len > p - name) {
- __putname(name);
- return NULL;
- }
-
- if (p > name + len)
- strcpy(name + len, p);
+ memcpy(name, root, len);
+ memmove(name + len, p, name + PATH_MAX - p);
return name;
}
@@ -396,7 +382,7 @@ static const struct file_operations hostfs_file_fops = {
.splice_write = iter_file_splice_write,
.read_iter = generic_file_read_iter,
.write_iter = generic_file_write_iter,
- .mmap = generic_file_mmap,
+ .mmap_prepare = generic_file_mmap_prepare,
.open = hostfs_open,
.release = hostfs_file_release,
.fsync = hostfs_fsync,
@@ -410,38 +396,33 @@ static const struct file_operations hostfs_dir_fops = {
.fsync = hostfs_fsync,
};
-static int hostfs_writepage(struct page *page, struct writeback_control *wbc)
+static int hostfs_writepages(struct address_space *mapping,
+ struct writeback_control *wbc)
{
- struct address_space *mapping = page->mapping;
struct inode *inode = mapping->host;
- char *buffer;
- loff_t base = page_offset(page);
- int count = PAGE_SIZE;
- int end_index = inode->i_size >> PAGE_SHIFT;
- int err;
-
- if (page->index >= end_index)
- count = inode->i_size & (PAGE_SIZE-1);
-
- buffer = kmap_local_page(page);
-
- err = write_file(HOSTFS_I(inode)->fd, &base, buffer, count);
- if (err != count) {
- if (err >= 0)
- err = -EIO;
- mapping_set_error(mapping, err);
- goto out;
+ struct folio *folio = NULL;
+ loff_t i_size = i_size_read(inode);
+ int err = 0;
+
+ while ((folio = writeback_iter(mapping, wbc, folio, &err))) {
+ loff_t pos = folio_pos(folio);
+ size_t count = folio_size(folio);
+ char *buffer;
+ int ret;
+
+ if (count > i_size - pos)
+ count = i_size - pos;
+
+ buffer = kmap_local_folio(folio, 0);
+ ret = write_file(HOSTFS_I(inode)->fd, &pos, buffer, count);
+ kunmap_local(buffer);
+ folio_unlock(folio);
+ if (ret != count) {
+ err = ret < 0 ? ret : -EIO;
+ mapping_set_error(mapping, err);
+ }
}
- if (base > inode->i_size)
- inode->i_size = base;
-
- err = 0;
-
- out:
- kunmap_local(buffer);
- unlock_page(page);
-
return err;
}
@@ -464,7 +445,8 @@ static int hostfs_read_folio(struct file *file, struct folio *folio)
return ret;
}
-static int hostfs_write_begin(struct file *file, struct address_space *mapping,
+static int hostfs_write_begin(const struct kiocb *iocb,
+ struct address_space *mapping,
loff_t pos, unsigned len,
struct folio **foliop, void **fsdata)
{
@@ -477,7 +459,8 @@ static int hostfs_write_begin(struct file *file, struct address_space *mapping,
return 0;
}
-static int hostfs_write_end(struct file *file, struct address_space *mapping,
+static int hostfs_write_end(const struct kiocb *iocb,
+ struct address_space *mapping,
loff_t pos, unsigned len, unsigned copied,
struct folio *folio, void *fsdata)
{
@@ -487,7 +470,7 @@ static int hostfs_write_end(struct file *file, struct address_space *mapping,
int err;
buffer = kmap_local_folio(folio, from);
- err = write_file(FILE_HOSTFS_I(file)->fd, &pos, buffer, copied);
+ err = write_file(FILE_HOSTFS_I(iocb->ki_filp)->fd, &pos, buffer, copied);
kunmap_local(buffer);
if (!folio_test_uptodate(folio) && err == folio_size(folio))
@@ -506,11 +489,12 @@ static int hostfs_write_end(struct file *file, struct address_space *mapping,
}
static const struct address_space_operations hostfs_aops = {
- .writepage = hostfs_writepage,
+ .writepages = hostfs_writepages,
.read_folio = hostfs_read_folio,
.dirty_folio = filemap_dirty_folio,
.write_begin = hostfs_write_begin,
.write_end = hostfs_write_end,
+ .migrate_folio = filemap_migrate_folio,
};
static int hostfs_inode_update(struct inode *ino, const struct hostfs_stat *st)
@@ -566,6 +550,7 @@ static int hostfs_inode_set(struct inode *ino, void *data)
}
HOSTFS_I(ino)->dev = dev;
+ HOSTFS_I(ino)->btime = st->btime;
ino->i_ino = st->ino;
ino->i_mode = st->mode;
return hostfs_inode_update(ino, st);
@@ -576,7 +561,10 @@ static int hostfs_inode_test(struct inode *inode, void *data)
const struct hostfs_stat *st = data;
dev_t dev = MKDEV(st->dev.maj, st->dev.min);
- return inode->i_ino == st->ino && HOSTFS_I(inode)->dev == dev;
+ return inode->i_ino == st->ino && HOSTFS_I(inode)->dev == dev &&
+ (inode->i_mode & S_IFMT) == (st->mode & S_IFMT) &&
+ HOSTFS_I(inode)->btime.tv_sec == st->btime.tv_sec &&
+ HOSTFS_I(inode)->btime.tv_nsec == st->btime.tv_nsec;
}
static struct inode *hostfs_iget(struct super_block *sb, char *name)
@@ -698,17 +686,25 @@ static int hostfs_symlink(struct mnt_idmap *idmap, struct inode *ino,
return err;
}
-static int hostfs_mkdir(struct mnt_idmap *idmap, struct inode *ino,
- struct dentry *dentry, umode_t mode)
+static struct dentry *hostfs_mkdir(struct mnt_idmap *idmap, struct inode *ino,
+ struct dentry *dentry, umode_t mode)
{
+ struct inode *inode;
char *file;
int err;
if ((file = dentry_name(dentry)) == NULL)
- return -ENOMEM;
+ return ERR_PTR(-ENOMEM);
err = do_mkdir(file, mode);
+ if (err) {
+ dentry = ERR_PTR(err);
+ } else {
+ inode = hostfs_iget(dentry->d_sb, file);
+ d_drop(dentry);
+ dentry = d_splice_alias(inode, dentry);
+ }
__putname(file);
- return err;
+ return dentry;
}
static int hostfs_rmdir(struct inode *ino, struct dentry *dentry)
@@ -939,7 +935,7 @@ static int hostfs_fill_super(struct super_block *sb, struct fs_context *fc)
sb->s_blocksize_bits = 10;
sb->s_magic = HOSTFS_SUPER_MAGIC;
sb->s_op = &hostfs_sbops;
- sb->s_d_op = &simple_dentry_operations;
+ sb->s_d_flags = DCACHE_DONTCACHE;
sb->s_maxbytes = MAX_LFS_FILESIZE;
err = super_setup_bdi(sb);
if (err)
generated by cgit v1.2.3 (git 2.39.0) at 2025-08-09 05:50:43 +0300