diff options
Diffstat (limited to 'fs/f2fs/file.c')
| -rw-r--r-- | fs/f2fs/file.c | 139 |
1 files changed, 134 insertions, 5 deletions
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index 60e7d5448a1..9c49c593d8e 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -19,6 +19,7 @@ #include <linux/compat.h> #include <linux/uaccess.h> #include <linux/mount.h> +#include <linux/pagevec.h> #include "f2fs.h" #include "node.h" @@ -194,6 +195,132 @@ out: return ret; } +static pgoff_t __get_first_dirty_index(struct address_space *mapping, + pgoff_t pgofs, int whence) +{ + struct pagevec pvec; + int nr_pages; + + if (whence != SEEK_DATA) + return 0; + + /* find first dirty page index */ + pagevec_init(&pvec, 0); + nr_pages = pagevec_lookup_tag(&pvec, mapping, &pgofs, PAGECACHE_TAG_DIRTY, 1); + pgofs = nr_pages ? pvec.pages[0]->index: LONG_MAX; + pagevec_release(&pvec); + return pgofs; +} + +static bool __found_offset(block_t blkaddr, pgoff_t dirty, pgoff_t pgofs, + int whence) +{ + switch (whence) { + case SEEK_DATA: + if ((blkaddr == NEW_ADDR && dirty == pgofs) || + (blkaddr != NEW_ADDR && blkaddr != NULL_ADDR)) + return true; + break; + case SEEK_HOLE: + if (blkaddr == NULL_ADDR) + return true; + break; + } + return false; +} + +static loff_t f2fs_seek_block(struct file *file, loff_t offset, int whence) +{ + struct inode *inode = file->f_mapping->host; + loff_t maxbytes = inode->i_sb->s_maxbytes; + struct dnode_of_data dn; + pgoff_t pgofs, end_offset, dirty; + loff_t data_ofs = offset; + loff_t isize; + int err = 0; + + mutex_lock(&inode->i_mutex); + + isize = i_size_read(inode); + if (offset >= isize) + goto fail; + + /* handle inline data case */ + if (f2fs_has_inline_data(inode)) { + if (whence == SEEK_HOLE) + data_ofs = isize; + goto found; + } + + pgofs = (pgoff_t)(offset >> PAGE_CACHE_SHIFT); + + dirty = __get_first_dirty_index(inode->i_mapping, pgofs, whence); + + for (; data_ofs < isize; data_ofs = pgofs << PAGE_CACHE_SHIFT) { + set_new_dnode(&dn, inode, NULL, NULL, 0); + err = get_dnode_of_data(&dn, pgofs, LOOKUP_NODE_RA); + if (err && err != -ENOENT) { + goto fail; + } else if (err == -ENOENT) { + /* direct node is not exist */ + if (whence == SEEK_DATA) { + pgofs = PGOFS_OF_NEXT_DNODE(pgofs, + F2FS_I(inode)); + continue; + } else { + goto found; + } + } + + end_offset = IS_INODE(dn.node_page) ? + ADDRS_PER_INODE(F2FS_I(inode)) : ADDRS_PER_BLOCK; + + /* find data/hole in dnode block */ + for (; dn.ofs_in_node < end_offset; + dn.ofs_in_node++, pgofs++, + data_ofs = pgofs << PAGE_CACHE_SHIFT) { + block_t blkaddr; + blkaddr = datablock_addr(dn.node_page, dn.ofs_in_node); + + if (__found_offset(blkaddr, dirty, pgofs, whence)) { + f2fs_put_dnode(&dn); + goto found; + } + } + f2fs_put_dnode(&dn); + } + + if (whence == SEEK_DATA) + goto fail; +found: + if (whence == SEEK_HOLE && data_ofs > isize) + data_ofs = isize; + mutex_unlock(&inode->i_mutex); + return vfs_setpos(file, data_ofs, maxbytes); +fail: + mutex_unlock(&inode->i_mutex); + return -ENXIO; +} + +static loff_t f2fs_llseek(struct file *file, loff_t offset, int whence) +{ + struct inode *inode = file->f_mapping->host; + loff_t maxbytes = inode->i_sb->s_maxbytes; + + switch (whence) { + case SEEK_SET: + case SEEK_CUR: + case SEEK_END: + return generic_file_llseek_size(file, offset, whence, + maxbytes, i_size_read(inode)); + case SEEK_DATA: + case SEEK_HOLE: + return f2fs_seek_block(file, offset, whence); + } + + return -EINVAL; +} + static int f2fs_file_mmap(struct file *file, struct vm_area_struct *vma) { file_accessed(file); @@ -242,6 +369,9 @@ static void truncate_partial_data_page(struct inode *inode, u64 from) unsigned offset = from & (PAGE_CACHE_SIZE - 1); struct page *page; + if (f2fs_has_inline_data(inode)) + return truncate_inline_data(inode, from); + if (!offset) return; @@ -288,10 +418,7 @@ int truncate_blocks(struct inode *inode, u64 from) return err; } - if (IS_INODE(dn.node_page)) - count = ADDRS_PER_INODE(F2FS_I(inode)); - else - count = ADDRS_PER_BLOCK; + count = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode)); count -= dn.ofs_in_node; f2fs_bug_on(count < 0); @@ -413,6 +540,7 @@ const struct inode_operations f2fs_file_inode_operations = { .listxattr = f2fs_listxattr, .removexattr = generic_removexattr, #endif + .fiemap = f2fs_fiemap, }; static void fill_zero(struct inode *inode, pgoff_t index, @@ -555,6 +683,7 @@ static int expand_inode_data(struct inode *inode, loff_t offset, i_size_read(inode) < new_size) { i_size_write(inode, new_size); mark_inode_dirty(inode); + f2fs_write_inode(inode, NULL); } return ret; @@ -678,7 +807,7 @@ long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) #endif const struct file_operations f2fs_file_operations = { - .llseek = generic_file_llseek, + .llseek = f2fs_llseek, .read = do_sync_read, .write = do_sync_write, .aio_read = generic_file_aio_read, |