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Linux/fs/iomap/seek.c

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Diff markup

Differences between /fs/iomap/seek.c (Version linux-6.12-rc7) and /fs/iomap/seek.c (Version linux-2.6.32.71)


  1 // SPDX-License-Identifier: GPL-2.0                 1 
  2 /*                                                
  3  * Copyright (C) 2017 Red Hat, Inc.               
  4  * Copyright (c) 2018-2021 Christoph Hellwig.     
  5  */                                               
  6 #include <linux/module.h>                         
  7 #include <linux/compiler.h>                       
  8 #include <linux/fs.h>                             
  9 #include <linux/iomap.h>                          
 10 #include <linux/pagemap.h>                        
 11 #include <linux/pagevec.h>                        
 12                                                   
 13 static loff_t iomap_seek_hole_iter(const struc    
 14                 loff_t *hole_pos)                 
 15 {                                                 
 16         loff_t length = iomap_length(iter);       
 17                                                   
 18         switch (iter->iomap.type) {               
 19         case IOMAP_UNWRITTEN:                     
 20                 *hole_pos = mapping_seek_hole_    
 21                                 iter->pos, ite    
 22                 if (*hole_pos == iter->pos + l    
 23                         return length;            
 24                 return 0;                         
 25         case IOMAP_HOLE:                          
 26                 *hole_pos = iter->pos;            
 27                 return 0;                         
 28         default:                                  
 29                 return length;                    
 30         }                                         
 31 }                                                 
 32                                                   
 33 loff_t                                            
 34 iomap_seek_hole(struct inode *inode, loff_t po    
 35 {                                                 
 36         loff_t size = i_size_read(inode);         
 37         struct iomap_iter iter = {                
 38                 .inode  = inode,                  
 39                 .pos    = pos,                    
 40                 .flags  = IOMAP_REPORT,           
 41         };                                        
 42         int ret;                                  
 43                                                   
 44         /* Nothing to be found before or beyon    
 45         if (pos < 0 || pos >= size)               
 46                 return -ENXIO;                    
 47                                                   
 48         iter.len = size - pos;                    
 49         while ((ret = iomap_iter(&iter, ops))     
 50                 iter.processed = iomap_seek_ho    
 51         if (ret < 0)                              
 52                 return ret;                       
 53         if (iter.len) /* found hole before EOF    
 54                 return pos;                       
 55         return size;                              
 56 }                                                 
 57 EXPORT_SYMBOL_GPL(iomap_seek_hole);               
 58                                                   
 59 static loff_t iomap_seek_data_iter(const struc    
 60                 loff_t *hole_pos)                 
 61 {                                                 
 62         loff_t length = iomap_length(iter);       
 63                                                   
 64         switch (iter->iomap.type) {               
 65         case IOMAP_HOLE:                          
 66                 return length;                    
 67         case IOMAP_UNWRITTEN:                     
 68                 *hole_pos = mapping_seek_hole_    
 69                                 iter->pos, ite    
 70                 if (*hole_pos < 0)                
 71                         return length;            
 72                 return 0;                         
 73         default:                                  
 74                 *hole_pos = iter->pos;            
 75                 return 0;                         
 76         }                                         
 77 }                                                 
 78                                                   
 79 loff_t                                            
 80 iomap_seek_data(struct inode *inode, loff_t po    
 81 {                                                 
 82         loff_t size = i_size_read(inode);         
 83         struct iomap_iter iter = {                
 84                 .inode  = inode,                  
 85                 .pos    = pos,                    
 86                 .flags  = IOMAP_REPORT,           
 87         };                                        
 88         int ret;                                  
 89                                                   
 90         /* Nothing to be found before or beyon    
 91         if (pos < 0 || pos >= size)               
 92                 return -ENXIO;                    
 93                                                   
 94         iter.len = size - pos;                    
 95         while ((ret = iomap_iter(&iter, ops))     
 96                 iter.processed = iomap_seek_da    
 97         if (ret < 0)                              
 98                 return ret;                       
 99         if (iter.len) /* found data before EOF    
100                 return pos;                       
101         /* We've reached the end of the file w    
102         return -ENXIO;                            
103 }                                                 
104 EXPORT_SYMBOL_GPL(iomap_seek_data);               
105                                                   

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